43,668 results match your criteria Langmuir : the ACS journal of surfaces and colloids[Journal]


Dynamics of Liquid Transfer from Nanoporous Stamps in High-Resolution Flexographic Printing.

Langmuir 2019 Apr 23. Epub 2019 Apr 23.

Printing of ultrathin layers of polymeric and colloidal inks is critical for the manufacturing of electronics on non-conventional substrates such as paper and polymer films. Recently, we found that nanoporous stamps overcome key limitations of traditional polymer stamps in flexographic printing, namely enabling the printing of ultrathin nanoparticle films with micron-scale lateral precision. Here, we study the dynamics of liquid transfer between nanoporous stamps and solid substrates. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00460DOI Listing

One-step in situ synthesis of reduced graphene oxide/Zn-Al layered double hydroxide film for enhanced corrosion protection of magnesium alloys.

Langmuir 2019 Apr 23. Epub 2019 Apr 23.

As an effective and environmentally friendly material for corrosion prevention, layered double hydroxide (LDH) films have usually been degraded due to their inherent microporous structure. In this study, graphene derivatives were employed to enhance the corrosion resistance of LDH films. After ultrasonic treatment of a reaction solution mixture containing graphene oxide (GO) powder, a reduced graphene oxide/zinc-aluminum LDH (RGO/Zn-Al LDH) film was in situ synthesized on a magnesium alloy substrate by a one-step facile hydrothermal crystallization process. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00529DOI Listing

Metal Nanoparticle enhancement of electron transfer to tethered redox centers through self-assembled molecular films.

Langmuir 2019 Apr 23. Epub 2019 Apr 23.

Metal nanoparticle mediated electron transfer (ET) across an insulator thin film containing nanoparticles with attached redox centers was studied using electrochemical impedance spectroscopy. Specifically, a gold spherical microelectrode was modified with 16-amino-1-hexa-decanethiol creating an insulator film. This was followed by the electrostatic adsorption of gold nanoparticles and the covalent attachment of Os2+ redox centers. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00280DOI Listing

Optimizing the synthesis of monodisperse colloidal spheres using holographic particle characterization.

Langmuir 2019 Apr 23. Epub 2019 Apr 23.

Holographic particle characterization measures the sizes and compositions of individual colloidal particles dispersed in fluid media and rapidly amasses statistics on the distributions of these properties, even for complex heterogeneous dispersions. This information is useful for analyzing and optimizing synthetic protocols. We illustrate how holographic characterization can guide process design through a case study on a particularly versatile model system composed of micrometer-scale spheres, which are synthesized from the organosilane monomer 3-(trimethoxysilyl)propyl methacrylate (TPM) and dispersed in aqueous media. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00012DOI Listing

Microscale droplets covered by amphiphilic gold nanoparticles with various ligand ratios and concentrations.

Soft Matter 2019 Apr 23. Epub 2019 Apr 23.

Department of Chemical Engineering, The Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea.

We describe a simple and reliable route for forming microscale droplets covered with amphiphilic gold nanoparticles (AuNPs) functionalized with mixed hydrophilic and hydrophobic ligands on the AuNP surface. When an aqueous solution of amphiphilic AuNPs was mixed with hexane, the hexane (or water) droplets covered with amphiphilic AuNPs in the water (or hexane) phase were created, in which amphiphilic AuNPs in water phase migrated to the hexane-water interface. The extent of AuNP migration to the interface could be tuned by the ratio of the hydrophobic to hydrophilic ligands on the AuNP surface and the overall concentration of AuNPs. Read More

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http://dx.doi.org/10.1039/c9sm00505fDOI Listing

Ultrasound assisted batch operation for the adsorption of hexavalent chromium onto engineered nanobiocomposite.

Heliyon 2019 Apr 12;5(4):e01491. Epub 2019 Apr 12.

Department of Chemistry, University of Kalyani, Kalyani 741235, West Bengal, India.

The study demonstrates the comparative retention characteristics of chromium from aqueous environment on iron(III) cellulose nanocomposite bead under conventional (C-ads) and ultrasound assisted (U-ads) batch adsorption operation. Optimization of process parameters was achieved varying pH, contact/sonication time, initial Cr(VI) concentration, adsorbent dose at fixed solution temperature. Equilibrium was achieved within 5 h and 30 min of contact time in C-ads and U-ads respectively. Read More

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http://dx.doi.org/10.1016/j.heliyon.2019.e01491DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6465586PMC

Protein adsorption characteristics of nanoparticle-assembled hollow microspheres of hydroxyapatite and their composites with PLLA microporous membranes.

Heliyon 2019 Apr 13;5(4):e01490. Epub 2019 Apr 13.

Department of Materials Science and Technology, Niigata University, Niigata 950-2181, Japan.

Nanoparticle-assembled hydroxyapatite (HA) hollow microspheres have a high surface area and are convenient to handle, owing to their characteristic structure. In this study we characterized the protein adsorption of HA hollow microspheres prepared from CaCl and KHPO by a water-in-oil-in-water (W/O/W) emulsion method assisted by two surfactants: Span 80 and Tween 20. The HA hollow microspheres adsorbed bovine serum albumin, bovine γ-globulin, equine skeletal muscle myoglobin, and chicken egg white lysozyme in 10 mM sodium phosphate buffer (pH 6. Read More

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http://dx.doi.org/10.1016/j.heliyon.2019.e01490DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6462782PMC

Nonlinear Optical Response of Graphene Oxide Langmuir-Blodgett Film as Saturable Absorbers.

Nanomaterials (Basel) 2019 Apr 19;9(4). Epub 2019 Apr 19.

Department of Physics, Taiyuan Normal University, Taiyuan 030031, China.

Two-dimensional (2D) materials as saturable absorbers (SAs) have attracted intense interest for applications in pulsed laser generation because of their distinguishing optical properties. However, the existing methods of preparing SAs were insufficient. Here, we fabricated graphene oxide (GO) SAs by Langmuir-Blodgett (LB) methods for passively Q-switched Nd:YAG laser. Read More

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http://dx.doi.org/10.3390/nano9040640DOI Listing

Engineering the Core-Shell Structured NCNTs-Ni2Si@Porous Si Composite with Robust Ni-Si Interfacial Bonding for High-Performance Li-Ion Batteries.

Langmuir 2019 Apr 22. Epub 2019 Apr 22.

A new strategy has been innovatively proposed for wrapping the Ni-incorporated and N-doped carbon nanotube arrays (Ni-NCNTs) on porous Si with the robust Ni-Si interfacial bonding to form the core-shell structured NCNTs-Ni2Si@Si. The hierarchical porous silicon core was firstly fabricated via a novel self-templating synthesis route based on two crucial strategies: in-situ thermal evaporation of crystal water from the perlite for producing porous SiO2, and the subsequent magnesiothermic reduction of porous SiO2 into porous Si. Ni-NCNTs were subsequently constructed based on the Ni-catalyzed tip-growth mechanism, and were further engineered to fully wrap the porous Si microparticles by forming the Ni2Si alloy at the heterojunction interface. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00558DOI Listing

Porous Aromatic Framework Modified Electrospun Fiber Membrane as a Highly Efficient and Reusable Adsorbent for Pharmaceuticals and Personal Care Products Removal.

ACS Appl Mater Interfaces 2019 Apr 22. Epub 2019 Apr 22.

Water contamination by emerging organic pollutants such as pharmaceuticals and personal care products (PPCPs) is becoming more and more serious. Porous aromatic frameworks (PAFs) are considered as promising adsorbents to remove the PPCPs. In order to overcome the limitation of PAFs in their powder forms for large-scale applications, herein we proposed a strategy to covalently anchor PAFs onto electrospun polymer fiber membranes. Read More

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http://dx.doi.org/10.1021/acsami.9b04326DOI Listing

Rapid assembly of colloidal crystals under laser illumination on GeSbTe substrate.

Langmuir 2019 Apr 22. Epub 2019 Apr 22.

Optical techniques have been actively studied for manipulating nano- to micro-sized objects. However, long-range attraction and the rapid transport of particles within thin quasi-two-dimensional systems are difficult due to the weak thermophoretic forces. Here, we introduce an experimental system that can rapidly generate quasi-two-dimensional colloidal crystals in deionized water, sandwiched between two hard plates. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00176DOI Listing

Probing Anisotropic Surface Properties of Illite by Atomic Force Microscopy.

Langmuir 2019 Apr 22. Epub 2019 Apr 22.

For the purpose of understanding the colloidal behaviors of illite in mineral processing, probing the surface charging property of illite is of great significance. This research explored the edge and basal surfaces of illite using an atomic force microscope (AFM). The interaction forces between Si/Si3N4 probes and illite edge/basal surfaces were measured, respectively, at different pH values in 10 mM KCl solutions. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00270DOI Listing

Freezing Driven DNA Adsorption on Gold Nanoparticles: Tolerating Extremely Low Salt Concentration but Requiring High DNA Concentration.

Authors:
Biwu Liu Juewen Liu

Langmuir 2019 Apr 22. Epub 2019 Apr 22.

Attaching thiolated DNA to gold nanoparticles (AuNPs) is a highly important and useful reaction for many applications. Various methods such as adding salts, acids, polymers and surfactants have been developed to facilitate the reaction. Recently, it was reported that a very high DNA density can be achieved simply by freezing with AuNPs with the DNA without any other reagents. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00746DOI Listing

Pinning-Depinning Mechanism of the Contact Line during Evaporation of Nanodroplets on Heated Heterogeneous Surfaces: A Molecular Dynamics Simulation.

Langmuir 2019 Apr 22. Epub 2019 Apr 22.

Droplet evaporation on heterogeneous or patterned surfaces has numerous potential applications, for example, inkjet printing. The effect of surface heterogeneities on the evaporation of a nanometer-sized cylindrical droplet on a solid surface is studied using molecular dynamics simulations of Lennard-Jones particles. Different heterogeneity of the surface was achieved through alternating stripes of equal width but two chemical types, which lead to different contact angles. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00796DOI Listing
April 2019
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Fe2O3-CeO2@Al2O3 Nano-arrays on Al-Mesh as SO2-tolerant Monolith Catalysts for NOx Reduction by NH3.

Environ Sci Technol 2019 Apr 22. Epub 2019 Apr 22.

Currently, selective catalytic reduction of NOx with NH3 in the presence of SO2 is still challenging at low temperatures (< 300 oC). In this study, enhanced NOx reduction was achieved over a SO2-tolerant Fe-based monolith catalyst which was originally developed through in situ construction of Al2O3 nano-arrays (na-Al2O3) on the monolithic Al-mesh by a steam oxidation method followed by anchoring Fe2O3 and CeO2 onto the na-Al2O3@Al-mesh composite by an impregnation method. The optimum catalyst delivered more than 90% NO conversion and N2 selectivity above 98% within 250-430 °C as well as excellent SO2 tolerance at 270 oC. Read More

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http://dx.doi.org/10.1021/acs.est.9b01217DOI Listing
April 2019
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Surfactant-Induced Self-Assembly of CdTe Quantum Dots into Multicolor Luminescent Hybrid Vesicles.

Langmuir 2019 Apr 22. Epub 2019 Apr 22.

Here we report the interaction of mercaptosuccinic acid (MSA)-capped CdTe quantum dots (QDs) with hexadecyltrimethylammonium bromide (CTAB) surfactant and subsequent formation of self-assembled multicolor luminescent vesicles in aqueous medium. A continuous phase sequence from clear (C1) to turbid (T1), precipitate (P), turbid (T2), and clear (C2) has been observed for QD solution upon increasing the concentration of positively-charged CTAB, indicating dynamic equilibrium between various self-assembled supramolecular structure. In contrast, no such changes have been observed in the presence of negatively-charged sodium dodecyl sulfate (SDS) and neutral Triton X-100 (TX-100) surfactants indicating specific electrostatic interactions behind the observed phase separation behavior. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00357DOI Listing

Evaluation of EGCG loading capacity in DMPC membranes.

Langmuir 2019 Apr 21. Epub 2019 Apr 21.

Catechins are molecules with potential use in different pathologies such as diabetes and cancer, but their pharmaceutical applications are often hindered by their instability in the bloodstream. This issue can be circumvented by using liposomes as their nanocarriers for in vivo delivery. In this work, we studied the molecular details of (-)-epigallocatechin-3-gallate (EGCG) interacting with 1,2-dimyristoyl- sn-glycero-3-phosphocholine (DMPC) monolayer/bilayer systems to understand the catechin loading ability and liposome stability, using experimental and computational techniques. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00372DOI Listing

Enhanced Cd removal from aqueous solution by biologically modified biochar derived from digestion residue of corn straw silage.

Sci Total Environ 2019 Mar 29;674:213-222. Epub 2019 Mar 29.

College of Resources, Sichuan Agricultural University, Chengdu 611130, China. Electronic address:

Biologically modified biochars derived from digestion residue of corn straw silage at different pyrolysis temperature (300-700 °C) were prepared for removing Cd from water. Compared with the pristine biochar derived from corn straw (CB), transabdominal transformation of corn straw silage (TCB) significantly increased surface area (4.24-56. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00489697193144
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http://dx.doi.org/10.1016/j.scitotenv.2019.03.438DOI Listing
March 2019
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Statistical optimization of glyphosate adsorption by biochar and activated carbon with response surface methodology.

Chemosphere 2019 Apr 11;227:533-540. Epub 2019 Apr 11.

Environmental Bio-innovations Group (EBiG), School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. Electronic address:

The introduction of glyphosate, found in herbicides, to waterbodies is of concern due to its toxicity and hence potential threat to public health and ecological systems. The present study has compared glyphosate removal from aqueous solution with activated carbon and biochar. Box-Behnken design, and percent contribution with Pareto analysis techniques were used in surface response and efficiency calculations modelled the process conditions and their effects. Read More

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http://dx.doi.org/10.1016/j.chemosphere.2019.04.078DOI Listing

Tragacanth gum based hydrogel nanocomposites for the adsorption of methylene blue: Comparison of linear and non-linear forms of different adsorption isotherm and kinetics models.

Int J Biol Macromol 2019 Apr 17. Epub 2019 Apr 17.

Chemistry group, Pardis College, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.

In the current work, novel eco-friendly hydrogel nanocomposite biosorbents (ef-HNCs) made up from tragacanth gum and modified CaCO nanoparticles (CC NPs) were applied for the adsorption of methylene blue dye (MBD). A simple, fast, and safe method regarding green chemistry was used to prepare the ef-HNC, with the aid of ultrasound waves. The ef-HNCs were successfully characterized using several spectroscopic, microscopic, and analytical methods. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S01418130193103
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http://dx.doi.org/10.1016/j.ijbiomac.2019.04.129DOI Listing
April 2019
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Removal of copper ions from aqueous solution using low temperature biochar derived from the pyrolysis of municipal solid waste.

Sci Total Environ 2019 Apr 10;673:777-789. Epub 2019 Apr 10.

College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK. Electronic address:

Sustainable methods to produce filter materials are needed to remove a variety of pollutants found in water including organic compounds, heavy metals, and other harmful inorganic and biological contaminants. This study focuses on the removal of Cu(II) from copper aqueous solutions using non-activated char derived from the pyrolysis of mixed municipal discarded materials (MMDM) using a new heat pipe-based pyrolysis reactor. Adsorption experiments were conducted by adding the char to copper solutions of varying concentration (50-250 mg/L) at a constant temperature of 30 °C. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00489697193160
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http://dx.doi.org/10.1016/j.scitotenv.2019.04.085DOI Listing
April 2019
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Coupling Langmuir with Michaelis-Menten-A practical alternative to estimate Se content in rice?

PLoS One 2019 19;14(4):e0214219. Epub 2019 Apr 19.

Technical University of Berlin (TUB), Institute of Applied Geosciences, Berlin, Germany.

Selenium plays an important, but vastly neglected role in human nutrition with a narrow gap between dietary deficiency and toxicity. For a potential biofortification of food with Se, as well as for toxicity-risk assessment in sites contaminated by Se, modelling of local and global Se cycling is essential. As bioavailability of Se for rice plants depends on the speciation of Se and the resulting interactions with mineral surfaces as well as the interaction with Se uptake mechanisms in plants, resulting plant Se content is complex to model. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0214219PLOS

Insight into the Transimination Process in the Fabrication of Surface Schiff-based Covalent Organic Frameworks.

Langmuir 2019 Apr 19. Epub 2019 Apr 19.

The on-surface synthesis of single-layered covalent organic frameworks (sCOFs) have been investigated by employing three-fold symmetry monomer 1 carrying aldehyde groups and the ditopic diamine building block 2 on a highly oriented pyrolytic graphite (HOPG) surface. The self-assembly of molecule 1 is persistently observed at stoichiometric ratio of reactive groups. The growth of sCOF network is observed, however, only at the large excess of diamine monomers. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.9b00565
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http://dx.doi.org/10.1021/acs.langmuir.9b00565DOI Listing
April 2019
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Temperature-Triggered Self-Assembled Structural Transformation: from Pure Hydrogen-Bonding Quad-rilateral Nano-Network to Trihexagonal Structures.

Langmuir 2019 Apr 19. Epub 2019 Apr 19.

The rational design and adequate control of structures of molecular building blocks plays an im-portant role in the fabrication of desired supramolecular nano-structures at interfaces. In this study, the formation of a pure hydrogen-bonding co-assembly supramolecular nano-network on a highly oriented pyrolytic graphite (HOPG) surface was demonstrated by means of scanning tunneling mi-croscope (STM). Thermal annealing process was conducted to monitor the temperature triggered structural transformation of the self-assembled nano-network. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00666DOI Listing

Hydrophobicity, freezing delay and morphology of laser treated aluminum surfaces.

Langmuir 2019 Apr 19. Epub 2019 Apr 19.

Until recently superhydrophobicity was considered as a hint to predict surface icephobicity, an association of concepts which is by no means universal and that has been proven to depend on different experimental factors and material properties, including the actual morphology and chemical state of surfaces. This work presents a systematic study of the wetting and freezing properties of aluminum Al6061, a common material widely used in aviation, after being subjected to nanosecond pulsed IR laser treatments to modify its surface roughness and morphology. All treated samples, independently of their surface finishing state, presented initially an unstable hydrophilic wetting behavior that naturally evolved with time to reach hydrophobicity or even superhydrophobicity. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.9b00457
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http://dx.doi.org/10.1021/acs.langmuir.9b00457DOI Listing
April 2019
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Aliphatic Diacidic Long-Chain C16 Polyesters from 10,16-Dihydroxyhexadecanoic Acid Obtained from Tomato Residual Wastes.

Molecules 2019 Apr 17;24(8). Epub 2019 Apr 17.

Instituto Politécnico Nacional ⁻ CNMN, Unidad Profesional Adolfo López Mateos, Col. Zacatenco, México City, CDMX CP 07738, México.

10,16-dihydroxyhexadecanoic acid obtained from agroresidual tomato waste, was oxidized to produce 7-oxohexadecanedioic acid in good yield (>70%) and purified without oxidation side products in one step. Polycondensation with 1,8-octanediol, yielded the polyester (poly(-carboxyl PA--OD)) with M = 2155.15 and M = 1637. Read More

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http://dx.doi.org/10.3390/molecules24081524DOI Listing

Controlling nucleation in quasi-two-dimensional Langmuir poly(L-lactide) films through variation of the rate of compression.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

We studied morphological changes in a quasi-two-dimensional Langmuir film of low molar mass poly(L-lactide) upon increasing the surface density, starting from randomly distributed molecules to a homogeneous monolayer of closely packed molecules, followed by nucleation and growth of mesoscopic, three-dimensional clusters from an over-compressed monolayer. The corresponding nucleation density of mesoscopic clusters within the monolayer can be tailored through variation of the rate of compression. For a given surface density and temperature, the nucleation probability was found to increase linearly with the rate of compression, allowing to adjust the density of mesoscopic clusters over nearly two orders of magnitude. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.9b00619
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http://dx.doi.org/10.1021/acs.langmuir.9b00619DOI Listing
April 2019
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Photo-rechargeable Organic-Inorganic Dye Integrated Polymeric Power Cell with Superior Performances and Durability.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

In present work, we propose a simple and unique approach to design a light-weight, low-cost, self-charging power cell with considerable capacity to generate and store photo-charges named as self-charged photo-power cell (SCPPC). Initially, highly electroactive sodium dodecyl sulphate (SDS) incorporated poly (vinylidene fluoride) (PVDF) composite thin films with a large dielectric constant ~ 525 are synthesized via simplistic solution casting process. Then as-prepared high dielectric SDS/PVDF thin film has been used as a charge storage medium in combination with a inorganic-organic dye film i. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00622DOI Listing
April 2019
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Adsorption of Pregelatinized Starch for Selective Flocculation and Flotation of Fine Siderite.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

Pregelatinized starch (PS) was used for the selective flocculation and flotation of fine siderite in carbonate-containing iron ore. With PS, the flotation of fine siderite was improved. The repulsive forces between fine siderite particles and the attractive forces between siderite and hematite or quartz were decreased after treated with PS, indicating the aggregation of siderite was enhanced and the aggregations of mixed minerals were weakened. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00669DOI Listing

Synergistic Tricolor Emission-Based White light from Supramolecular Organic-Inorganic Hybrid Gel.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

The development of engineered hybrid systems by encapsulating nanoparticles in gel scaffolds and their synergistic effects are highly crucial for the fabrication of advanced functional materials. Herein, a series of dipeptides containing an aromatic amino acid at the N-terminal and an aliphatic amino acid at the C- terminal were synthesized and studied. Among them, only the dipeptide L-Phe-L-Val can form both hydro- and organogelator, depending on the N and C terminal protecting groups. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00456DOI Listing

Nanogels and microgels: From model colloids to applications, recent developments and future trends.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

Nanogels and microgels are soft, deformable and penetrable objects with an internal gel-like structure that is swollen by the dispersing solvent. Their softness and the potential to respond to external stimuli like temperature, pressure, pH, ionic strength and different analytes make them interesting as soft model systems in fundamental research as well as for a broad range of applications, in particular in the field of biological applications. Recent tremendous developments in their synthesis open access to systems with complex architectures and compositions allowing for tailoring microgels with specific properties. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.8b04304
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http://dx.doi.org/10.1021/acs.langmuir.8b04304DOI Listing
April 2019
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Construction of Paramagnetic Manganese-chelated Polymeric Nanoparticles Using Pyrene-end-modified Double-Hydrophilic Block-Copolymers for Enhanced Magnetic Resonance Relaxivity: A Comparative Study with Cisplatin Pharmacophore.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

Cationic metal-mediated self-assembly of double-hydrophilic block-copolymers (DHBCs) has been of great interest for the preparation of hybrid nanoparticles for versatile applications. Among many functional transition metal ions, manganese (Mn) is a highly attractive element due to the paramagnetic property with high coordination number. However, Mn does not lead to the efficient self-assembly of DHBCs because of the relatively high aqueous solubility of coordinated Mn. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00406DOI Listing

Raman Microspectroscopy Study of the Hydrolytic Degradation of Polyanhydride Network Polymers.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

Raman microspectroscopy was employed in this work to study the degradation of a polyanhydride network polymer synthesized from 4-pentenoic anhydride (PNA) and pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) monomers in order to illustrate the utility of this method and improve understanding of the polyanhydride degradation and erosion. Disk-shaped polymer samples were immersed in buffer solutions for different periods of time and hydrolytic degradation was monitored spatially and temporally via kinetic Raman studies at various depths of penetration into the samples. Erosion, meanwhile, was monitored via mass loss measurements. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.8b04334
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http://dx.doi.org/10.1021/acs.langmuir.8b04334DOI Listing
April 2019
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The Effect of the Mixing Region Geometry and Collector Distance on Microbubble Formation using a Capillary Embedded Microfluidic Device coupled with AC-DC Electric Fields.

Langmuir 2019 Apr 18. Epub 2019 Apr 18.

In this work we report a significant advance in the preparation of monodisperse microbubbles using a combination of microfluidic and electric field technologies. Microbubbles have been employed in various fields such as biomedical engineering, water purification and food engineering. Many techniques have been investigated for their preparation. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.8b03677
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http://dx.doi.org/10.1021/acs.langmuir.8b03677DOI Listing
April 2019
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Importance of point defect reactions for the atomic-scale roughness of III-V nanowire sidewalls.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Departement Physique, Institut Superieur d'Electronique du Nord, 41 Boulevard Vauban, F-59046 Lille Cedex, Lille, FRANCE.

The surface morphology of III-V semiconductor nanowires protected by an arsenic cap and subsequently evaporated in ultrahigh vacuum is investigated with scanning tunneling microscopy and scanning transmission electron microscopy. We show that the changes of the surface morphology as a function of the nanowire composition and the nature of the seed particles are intimately related to the formation and reaction of surface point defects. Langmuir evaporation close to the congruent evaporation temperature causes the formation of vacancies which nucleate and form vacancy islands on {110} sidewalls of self-catalysed InAs nanowires. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1a4eDOI Listing
April 2019
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Self-assembly of graphene oxide/PEDOT:PSS nanocomposite as a novel adsorbent for uranium immobilization from wastewater.

Environ Pollut 2019 Apr 11;250:196-205. Epub 2019 Apr 11.

MOE Key Lab of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China.

In recent years, water pollution caused by radionuclides has become a rising concern, among which uranium is a representative class of actinide element. Since hexavalent uranium, i.e. Read More

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http://dx.doi.org/10.1016/j.envpol.2019.04.020DOI Listing
April 2019
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Using Hydrogel to Diversify the Adaptability and Applicability of Functional Nanoparticles: from Nanotech-Flavored Jellies to Artificial Enzymes.

Langmuir 2019 Apr 17. Epub 2019 Apr 17.

The use of hydrogel to accommodate nanoparticles is generally aimed at synergetic integration of the peculiar electronic, photonic, magnetic, mechanical, and chemical properties of the nanoparticles with the stimuli-response of the hydrogels into unprecedented, smart, collective functions. The intrinsic water-borne nature of hydrogels further endorses the significant implications of such nanocomposites in biology and medicine. This article will be an account with accent on how to introduce nanoparticles within a hydrogel and to utilize the hydrogel to assist the nanoparticles to adapt themselves into different environments with a large span of polarity ranging from orthodox aqueous media to unorthodox organic ones. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00254DOI Listing

Extracellular DNA Provides Structural Integrity to a Micrococcus luteus Biofilm.

Langmuir 2019 Apr 17. Epub 2019 Apr 17.

Department of Physics and Astronomy , The University of Sheffield , Hounsfield Road , Sheffield S3 7RH , U.K.

Force spectroscopy was used to show that extracellular DNA (eDNA) has a pre-eminent structural role in a biofilm. The adhesive behavior of extracellular polymeric substances to poly(ethylene terephthalate), a model hydrophobic surface, was measured in response to their degradation by hydrolytic enzymes known for their biofilm dispersion potential: DNaseI, protease, cellulase, and mannanase. Only treatment with DNaseI significantly decreased the adhesive force of the model bacterium Micrococcus luteus with the surface, and furthermore this treatment almost completely eliminated any components of the biofilm maintaining the adhesion, establishing a key structural role for eDNA. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00297DOI Listing

Enhanced Adsorption and Slow Release of Phosphate by Dolomite-Alginate Composite Beads as Potential Fertilizer.

Water Environ Res 2019 Apr 16. Epub 2019 Apr 16.

Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, Tennessee, 37235-1831, United States.

The recovery and reuse of phosphorus (P) from wastewater treatment process is a critical and viable target for sustainable P utilization. This study explores a novel approach of integrating ultrafine mineral particles into hydrogel matrixes for enhancing the capacity of phosphate adsorption. Dolomite-alginate (DA) hydrogel beads were prepared by integrating ball-milled, ultrafine dolomite powders into calcium cross-linked alginate hydrogel matrix. Read More

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http://dx.doi.org/10.1002/wer.1122DOI Listing

Aminosilane-grafted spherical cellulose nanocrystal aerogel with high CO adsorption capacity.

Environ Sci Pollut Res Int 2019 Apr 16. Epub 2019 Apr 16.

College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, People's Republic of China.

In this study, the cellulose nanocrystals (CNC) obtained by acid hydrolysis of microcrystalline cellulose (MCC) are customized by suspension to obtain a spherical CNC hydrogel. The N-(2-aminoethyl) (3-amino-propyl) methyldimethoxyansile (AEAPMDS) preparation was grafted to spherical CNC hydrogel using a water phase heat treatment. Finally, aerogel samples were obtained by tert-butanol replacement and freeze-drying. Read More

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http://link.springer.com/10.1007/s11356-019-05068-3
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http://dx.doi.org/10.1007/s11356-019-05068-3DOI Listing
April 2019
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Poly-phosphocholinated Liposomes Form Stable Superlubrication Vectors.

Langmuir 2019 Apr 16. Epub 2019 Apr 16.

We have prepared phosphatidylcholine (PC) vesicles (liposomes) incorporating a novel lipid/poly-phosphocholine conjugate. This both stabilizes the liposomes against aggregation (for example during storage or when being delivered) and at the same time allows them to act as very efficient lubricating elements readily attaining superlubric performance (defined as coefficient of friction  < 10-2) via hydration lubrication, at physiological salt concentrations and pressures. In contrast, vesicles sterically-protected by poly(ethylene glycol) chains (PEGylation), which is the general method-of-choice, while equally stable to aggregation, are much poorer lubricants under these conditions, attributed to relatively poor hydration of the PEG. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00610DOI Listing

Unraveling Interaction Mechanisms between Molybdenite and Dodecane Oil Droplet Using Atomic Force Microscopy.

Langmuir 2019 Apr 16. Epub 2019 Apr 16.

Molybdenite (MoS2) is a mineral that has drawn great interest because of its potential application in various fields. To facilitate the flotation of molybdenite, the mineral pulp is commonly treated with non-polar oil additives to promote hydrophobicity and to form an oil bridge between ultrafine molybdenite particles for agglomeration. In this study, dodecane was chosen as a model oil to investigate the flotation mechanisms of molybdenite by non-polar oil. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00203DOI Listing

Liquid marbles in nature: Craft of aphids for survival.

Langmuir 2019 Apr 16. Epub 2019 Apr 16.

Some aphids that live in the leaf galls of the host plant are known to fabricate liquid marbles consisting of honeydew and wax particles as an inner liquid and a stabilizer, respectively. In this study, the liquid marbles fabricated by the galling aphids, Eriosoma moriokense, were extensively characterized with respect to size and size distribution, shape, nanomorphology, liquid/solid weight ratio, and chemical compositions. The stereo microscopy studies confirmed that the liquid marbles have a near-spherical morphology and that the number-average diameter was 368±152 m, which is one order of magnitude smaller than the capillary length of the honeydew. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00771DOI Listing
April 2019
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Role of Hydrophilic Latex Particle Surface in Water Diffusion into Films from Waterborne Polymer Colloids.

Langmuir 2019 Apr 16. Epub 2019 Apr 16.

Diffusion mechanism and growth of large-scale domains during the immersion the latex films in water have been thoroughly investigated with the scattering techniques in a combination with the gravimetric method. Latex dispersions for the film formation studies had identical main monomer compositions and only differ in the hydrophilic comonomers that result in distinct "hairy" layer structures of the particles. The major effects of the presence and the structure of the surface layers were identified: (1) Introducing the hydrophilic surface layer in the binder structure results in a more uniform penetration of water and reducing the water domain growth. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04327DOI Listing

Regioregularity and deposition effect on the physical/chemical properties of polythiophene derivatives films.

Nanotechnology 2019 Apr 16. Epub 2019 Apr 16.

Universidade Estadual Paulista Julio de Mesquita Filho - Campus de Presidente Prudente, Presidente Prudente, SP, BRAZIL.

Polythiophene thin films are widely studied for applications in organic electronics. However, some comparisons are still missing, regarding distinct deposition techniques and regioregularity. Here regioregular and regiorandom alkyl-substituted polythiophene derivatives (P3ATs) were deposited on solid substrates using both Langmuir-Blodgett (LB) and Langmuir-Schaefer (LS) techniques. Read More

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http://dx.doi.org/10.1088/1361-6528/ab19f0DOI Listing
April 2019
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Sustainable valorization of mesoporous aluminosilicate composite from display panel glasses waste for adsorption of heavy metal ions.

Sci Total Environ 2019 Apr 5;673:337-346. Epub 2019 Apr 5.

Department of Chemical Analysis, Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan.

The recycling of the huge amount of thin film transistor liquid crystal display (TFT-LCD) glass wastes has become one of the worldwide environmental issues. Herein, a novel and cost-effective synthesis method for the fabrication of mesoporous aluminosilicate composite (M-ANC) from the TFT-LCD waste has been developed to serve as the environmentally benign adsorbent for the removal of metal ions including Cu, Zn and Ni. After melting at 1000 °C in the presence of NaCO for phase separation, nanoparticles with average particle size of 12 nm appear on the surface of M-ANC, and subsequently results in the production of mesoporous structure with a surface area of 175 m g. Read More

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http://dx.doi.org/10.1016/j.scitotenv.2019.04.056DOI Listing
April 2019
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Sustainable synthesis and remarkable adsorption capacity of MOF/graphene oxide and MOF/CNT based hybrid nanocomposites for the removal of Bisphenol A from water.

Sci Total Environ 2019 Mar 27;673:306-317. Epub 2019 Mar 27.

Department of Chemistry, University of Texas at El Paso, El Paso, TX 79968, United States; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, The University of Texas at El Paso, El Paso, TX, United States. Electronic address:

A series of novel absorbents based on Cu-BDC MOFs decorated over graphene oxide (GrO) and carbon nanotubes (CNTs) hybrid nanocomposites, namely Cu-BDC@GrO and Cu-BDC@CNT, are synthesized via a facile and one-pot green solvothermal method for water remediation. The nanocomposites were characterized by XRD, TEM, SEM, EDS, Raman, FTIR, TGA, XPS, Zetasizer and ICP-OES instruments. XRD results confirmed the high crystalline structure of the synthesized hybrid nanocomposites. Read More

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http://dx.doi.org/10.1016/j.scitotenv.2019.03.219DOI Listing

The unique features of non-competitive vs. competitive sorption: Tests against single volatile aromatic hydrocarbons and their quaternary mixtures.

Environ Res 2019 Mar 22;173:508-516. Epub 2019 Mar 22.

Department of Civil Engineering, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Pakistan.

The adsorption characteristics of four aromatic hydrocarbons (i.e., benzene, toluene, xylene, and styrene) onto ground-activated carbon were investigated both independently and as a mixture of the four at <10 Pa partial pressures (e. Read More

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http://dx.doi.org/10.1016/j.envres.2019.03.046DOI Listing
March 2019
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Experimental, kinetic, and thermodynamic studies of adsorptive desulfurization and denitrogenation of model fuels using novel mesoporous materials.

J Hazard Mater 2019 Apr 8;374:129-139. Epub 2019 Apr 8.

Chemical Engineering Department, Amirkabir University of Technology, Mahshahr Campus, Mahshahr,Iran. Electronic address:

The kinetics, equilibrium and thermodynamics studies of adsorptive desulfurization and denitrogenation to eliminate the refractory sulfur and nitrogen compounds like BT, DBT, quinoline and carbazole of model fuel by mesoporous material (MSU-S) and cobalt modified mesoporous material (CoO-MSU-S) adsorbents were carried out. The adsorption performance, capacity and selectivity of the adsorbent toward sulfur and nitrogen compounds were examined. Equilibrium and kinetics experiments confirmed that Co impregnation would enhance the adsorption capacity of MSU-S. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2019.04.029DOI Listing

Chemical stability of mesoporous oxide thin film electrodes under electrochemical cycling: from dissolution to stabilization.

Langmuir 2019 Apr 15. Epub 2019 Apr 15.

Mesoporous oxide thin films (MOTF) present very high surface areas, and highly controlled monodisperse pores in the nm range. These features spurred their possible applications in separation membranes and perm-selective electrodes. However, their performance in real applications is limited by their reactivity. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00224DOI Listing