43,103 results match your criteria Langmuir : the ACS journal of surfaces and colloids[Journal]


Adsorption, desorption, and crystallization of aqueous solutions in nanopores.

Langmuir 2019 Feb 20. Epub 2019 Feb 20.

Probing nano-confined solutions in tortuous, mesoporous media is challenging due to pore size, complex pore connectivity, and coexistence of multiple components and phases. Here, we use optical reflectance to experimentally investigate the wetting and drying of a mesoporous medium with ~3 nm diameter pores containing aqueous solutions of sodium chloride and lithium chloride. We show that the vapor activities, i. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04307DOI Listing
February 2019

Monte Carlo Molecular Modeling of Temperature and Pressure Effects on the Interactions between Crystalline Calcium Silicate Hydrate Layers.

Authors:
Tulio Honorio

Langmuir 2019 Feb 20. Epub 2019 Feb 20.

The interactions of calcium silicate hydrates with water are at the heart of critical features of cement-based materials behavior such as drying and autogenous shrinkage, hysteresis, creep and thermal expansion. In this article, the interactions between nanocrystalline layers of calcium silicate hydrates are computed from Grand Canonical Monte Carlo (GCMC) molecular simulations. The effects of temperature, chemical potential and pressure on these interactions are studied. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04156DOI Listing
February 2019

The Stefan-Reynolds model and the modified Stefan-Reynolds model for studying bubble-particle attachment interactions in the context of flotation.

Langmuir 2019 Feb 20. Epub 2019 Feb 20.

Bubble-particle attachment is the key step for successful flotation. Modelling of attachment interactions between air bubbles and particles after their collision can be analysed using the Stefan-Reynolds model (immobile bubble surfaces) and the modified Stefan-Reynolds model (mobile bubble surfaces). However, these models have been rarely used, and the limitations of these models have not yet been reported. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00397DOI Listing
February 2019

The effect of particle size on the rising behavior of particle-laden bubbles.

Langmuir 2019 Feb 20. Epub 2019 Feb 20.

The rising behavior of bubbles, initially half and fully coated with glass beads of various sizes, was investigated. The bubble velocity, aspect ratio and oscillation periods were determined using high-speed photography and image analysis. In addition, the acting forces, drag modification factor and modified drag coefficient were calculated and interpreted. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04112DOI Listing
February 2019

Generalized On-demand Production of Nanoparticle Monolayers on Arbitrary Solid Surfaces via Capillarity-mediated Inverse Transfer.

Nano Lett 2019 Feb 20. Epub 2019 Feb 20.

Century-old Langmuir monolayer deposition still represents the most convenient approach to the production of monolayers of colloidal nanoparticles on solid substrates for practical biological and chemical sensing applications. However, this approach simply yields arbitrarily-shaped large monolayers on a flat surface, and is strongly limited by substrate topography and interfacial energy. Here we describe a generalized and facile method of rapidly producing uniform monolayers of various colloidal nanoparticles on arbitrary solid substrates by using an ordinary capillary tube. Read More

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http://dx.doi.org/10.1021/acs.nanolett.9b00248DOI Listing
February 2019

Mixed heavy metal removal from wastewater by using discarded mushroom-stick biochar: adsorption properties and mechanisms.

Environ Sci Process Impacts 2019 Feb 20. Epub 2019 Feb 20.

Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 100029, China.

The physicochemical and morphological properties and the sorption capacities of discarded mushroom-stick biochar (DMB) prepared at different pyrolysis temperatures from 300 °C to 800 °C were explored. Results showed that the yield and surface oxygen-containing group content of DMB prepared at 300 °C (DMB3) were higher than those of DMB prepared at higher pyrolysis temperature (DMB5 and DMB8), while the DMB prepared at 800 °C (DMB8) had higher pH, mineral element and ash content, aromaticity, and polarity. Therefore, the heavy metal adsorption capacity of DMB3 was higher than that of DMB5, while the maximal sorption capacities for Pb2+, Cu2+, Cd2+, and Ni2+ (21. Read More

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http://dx.doi.org/10.1039/c8em00457aDOI Listing
February 2019

Simultaneous silicon oxide growth and electrophoretic deposition of graphene oxide.

Langmuir 2019 Feb 20. Epub 2019 Feb 20.

During electrophoretic deposition of graphene oxide (GO) sheets on silicon substrates, not only deposition but also simultaneous anodic oxidation of the silicon substrate takes place, leading to a three-layered material. SEM images reveal the presence of GO sheets on the silicon substrate, and this is also confirmed by XPS, albeit that the carbon portion increases with increasing emission angle, hinting at a thin carbon layer. With increasing applied potential and increasing conductivity of the GO solution the carbon signal decreases, while the overall thickness of the added layer formed on top of the silicon substrate increases. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03139DOI Listing
February 2019

Modelling on the removal of toxic metal ions from aquatic system by different surface modified Cassia fistula seeds.

Bioresour Technol 2019 Feb 15;281:1-9. Epub 2019 Feb 15.

Gujarat Pollution Control Board, Sector-10A, Gandhinagar 382010, India.

The present work demonstrates the preparation of Cassia fistula seeds for producing activated carbon through physical and chemical treatment for the extrusion of Ni(II) ion contaminated aqueous solution. The readily prepared sorbents were characterized using SEM-EDX and FTIR. The surface morphology of sorbents possesses 1 μm mean particle size with uniform size distribution. Read More

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http://dx.doi.org/10.1016/j.biortech.2019.02.070DOI Listing
February 2019

Carboxymethyl cellulose thiol-imprinted polymers: Synthesis, characterization and selective Hg(II) adsorption.

J Environ Sci (China) 2019 May 13;79:280-296. Epub 2018 Dec 13.

Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Johannesburg 2028, South Africa; Centre for Nanomaterials, University of Johannesburg, Doornfontein Campus, Johannesburg 2028, South Africa.

Sulfur containing ion imprinted polymers (S-IIPs) were applied for the uptake of Hg(II) from aqueous solution. Cysteamine which was used as the ligand for Hg(II) complexation, was grafted along the epichlorohydrin crosslinked carboxylated carboxymethyl cellulose polymer chain through an amide reaction. The adsorption ability of S-IIPs towards Hg(II) was investigated by kinetic and isotherm models, which, corresponding, showed that the adsorption process followed a pseudo-second-order, fitted well with the Langmuir isotherm with a maximum adsorption capacity of 80 mg/g. Read More

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http://dx.doi.org/10.1016/j.jes.2018.11.022DOI Listing

Enhanced adsorption of arsenate by spinel zinc ferrite nano particles: Effect of zinc content and site occupation.

J Environ Sci (China) 2019 May 25;79:248-255. Epub 2018 Sep 25.

School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), South China University of Technology, Guangdong 510006, China; Guangdong Engineering and Technology Research Center for Environmental Nanomaterials, South China University of Technology, Guangdong 510006, China.

In this work, zinc ferrite spinel with different zinc contents (ZnFeO) was synthesized by a hydrothermal method and used for removing As(V) in aqueous solution. X-ray diffraction (XRD) results indicated that in the crystal structure of ZnFeO, the zinc atoms tended to occupy the octahedral sites for x < 0.6 and diffused into the tetrahedral sites gradually with x > 0. Read More

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http://dx.doi.org/10.1016/j.jes.2018.09.010DOI Listing

Kinetic study on photocatalytic degradation of Acid Orange 52 in a baffled reactor using TiO nanoparticles.

J Environ Sci (China) 2019 May 4;79:213-224. Epub 2018 Nov 4.

Civil and Environmental Engineering Faculty, Tarbiat Modares University, Tehran 14115-397, Iran.

In this study, a baffled photocatalytic reactor was used for the treatment of colored wastewater containing the azo dye of Acid Orange 52 (AO52). A study on the active species of the photocatalytic process using TiO nanoparticles indicated that hydroxyl radical and superoxide have the greatest contribution to the dye degradation process respectively. Given that a level of biological oxygen demand/chemical oxygen demand (BOD/COD) equal to 0. Read More

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http://dx.doi.org/10.1016/j.jes.2018.06.012DOI Listing

Langmuir films at the oil/water interface revisited.

Sci Rep 2019 Feb 19;9(1):2259. Epub 2019 Feb 19.

Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Depto. de Química, Cátedra de Química Biológica. Córdoba, Argentina. Av. Vélez Sarsfield 1611, X5016GCA, Córdoba, Argentina.

We studied monomolecular layers at the oil/water interface (O/W) in a Langmuir interfacial trough using egg-yolk phosphatidylcholine (EPC) (the model phospholipid) and Vaseline (VAS) as oil phase. The temporal dynamics in the surface pressure (π) evolution depended on the method (spreading/adsorption) used for monolayers preparation and reflected the different distribution of EPC between all the system compartments (bulk phases and interfaces). We distinguished between EPC located either stable at the interface or hopping between the interface and bulk phases. Read More

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http://dx.doi.org/10.1038/s41598-019-38674-9DOI Listing
February 2019

Enhanced removal of ciprofloxacin using humic acid modified hydrogel beads.

J Colloid Interface Sci 2019 Jan 31;543:76-83. Epub 2019 Jan 31.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China. Electronic address:

In this study, humic acid coated biochar (HA-BC) and chitosan were combined to prepare an adsorbent with enhanced reactivity for the removal of ciprofloxacin (CIP). With initial CIP concentrations of 250 mg/L, the maximum adsorbed amount was 154.89 mg/g. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.01.083DOI Listing
January 2019

Double emulsion drop evaporation and formation of daughter droplet.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

In this study, we present experimental and theoretical analyses of evaporating double emulsion drop resting on a substrate. Multistage evaporation of outer and inner droplet is witnessed. The complete evaporation of outer drop and the initialization of the inner drop evaporation demonstrate an interesting transition dynamics. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03862DOI Listing
February 2019

A Chemical Strategy for Amphiphile Replacement in Membrane Protein Research.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

Membrane mimics are indispensable tools in the structural and functional understanding of membrane proteins (MPs). Given stringent requirements of integral MP manipulations, amphiphile replacement is often required in sample preparation for various biophysical purposes. Current protocols generally rely on physical methodologies and rarely reach complete replacement. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04072DOI Listing
February 2019

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption.

Authors:
Yutong Liu Tao Tian

Materials (Basel) 2019 Feb 13;12(4). Epub 2019 Feb 13.

Key Laboratory of Groundwater Resources and Environment, Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130012, China.

Adsorption technology is an effective method to remove volatile organic compounds (VOCs). In this work, we prepared hierarchical porous materials using modified diatomite (Dt) as a support and nano-sized silicalite-1 (S-1) seeds as inorganic fillers, which were applied to adsorb volatile organic compounds (VOCs). The characterization of the composites indicated that S-1 was successfully coated onto the surface of modified Dt, and the best surface area of the composites was 398. Read More

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http://dx.doi.org/10.3390/ma12040551DOI Listing
February 2019

Preparation of Self-Assembled Composite Films Constructed by Chemically-Modified MXene and Dyes with Surface-Enhanced Raman Scattering Characterization.

Nanomaterials (Basel) 2019 Feb 18;9(2). Epub 2019 Feb 18.

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.

The effective functionalization and self-assembly of MXene are of crucial importance for a broad range of nanomaterial applications. In this work, we investigated the aggregates of sulfanilic acid-modified MXene (abbreviated as MXene-SO3H) with three model dyes at the air⁻water interface and demonstrated the morphological and aggregation changes of composite films, using Langmuir-Blodgett (LB) technology, as well as excellent uniformity and reproducibility by using surface-enhanced Raman scattering (SERS) spectra. This research has found that cationic dye molecules were adsorbed onto negatively charged MXene-SO3H particles mainly through electrostatic interaction and the particles induced dyes to form highly ordered nanostructures including H- and/or J-aggregates corresponding to monomers in bulk solution. Read More

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http://dx.doi.org/10.3390/nano9020284DOI Listing
February 2019

Enhanced N-doped Porous Carbon Derived from KOH-Activated Waste Wool: A Promising Material for Selective Adsorption of CO₂/CH₄ and CH₄/N₂.

Nanomaterials (Basel) 2019 Feb 15;9(2). Epub 2019 Feb 15.

School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.

Separation of impurities (CO₂ and N₂) from CH₄ is an important issue for natural gas alternatives (such as coalbed gas, biogas, and landfill gas) upgrading. It is notably challenging to synthesize high N-doped porous carbon with an appropriate porous structure. In this work, high N content (14. Read More

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http://dx.doi.org/10.3390/nano9020266DOI Listing
February 2019

Reply to "Comment on 'Langmuir oscillations in a nonextensive electron-positron plasma'".

Authors:
E Saberian

Phys Rev E 2019 Jan;99(1-2):017202

Department of Physics, Faculty of Basic Sciences, University of Neyshabur, 9319774446, Neyshabur, Iran.

In their Comment, Rehman and Ahmad have noted that the damping rate of Langmuir oscillations in a q-nonextensive electron-positron plasma is always negative and so resulting only in Landau damped oscillations and no unstable modes. As a Reply, I would like to resolve the origin of the misleading result in Phys. Rev. Read More

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http://dx.doi.org/10.1103/PhysRevE.99.017202DOI Listing
January 2019

Phase field crystal simulations of the kinetics of Ostwald ripening in two dimensions.

Phys Rev E 2019 Jan;99(1-1):012803

Department of Physics and Materials Science, The University of Memphis, Memphis, Tennessee 38152, USA.

The kinetics of Ostwald ripening of solid domains in the liquid phase of one-component systems in two dimensions is investigated numerically via the phase field crystal model. The simulations, which are performed systematically as a function of volume fraction of the solid phase, show that dynamical scaling is reached during late times, and the growth law is in good agreement with the classical theory of Lifshitz, Slyozov, and Wagner (LSW), i.e. Read More

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http://dx.doi.org/10.1103/PhysRevE.99.012803DOI Listing
January 2019

Phase transitions in phospholipid monolayers: Statistical model at the pair approximation.

Phys Rev E 2019 Jan;99(1-1):012147

Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas (UNICAMP), Rua Sérgio Buarque de Holanda, 777, Cidade Universitária, Campinas SP, 13083-859, Brazil.

A Langmuir film, consisting of a phospholipid monolayer at the air-water interface, was modeled as a two-dimensional lattice gas corresponding to a ternary mixture of water molecules (w), ordered-chain lipids (o), and disordered-chain lipids (d). The statistical problem is formulated in terms of a spin-1 model, in which the disordered-chain lipid states possess a high degenerescence ω≫1, and was termed Doniach lattice gas (DLG). Motivated by some open questions in the analysis of the DLG model at the mean-field approximation (MFA) [Phys. Read More

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http://dx.doi.org/10.1103/PhysRevE.99.012147DOI Listing
January 2019

Comment on "Langmuir oscillations in a nonextensive electron-positron plasma".

Phys Rev E 2019 Jan;99(1-2):017201

Department of Physics, FBAS, International Islamic University, Islamabad 44000, Pakistan.

Saberian and Esfandyari-Kalejahi [Phys. Rev. E 87, 053112 (2013)10. Read More

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http://dx.doi.org/10.1103/PhysRevE.99.017201DOI Listing
January 2019

Controlled Phase Separation in Poly( p-phenyleneethynylene) Thin Films and its Relationship to Vapor Sensing Properties.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

In this paper, we report the synthesis and mesoporous film formation of hydrophobic rod-like poly( p-phenyleneethynylene)s (PPEs) and present porosity-dependent quenching studies using 1,3,5-trinitrotoluene (TNT) vapors. Non-solvent vapor-induced phase separation (NVIPS) was used to induce pore formation during film casting, and the concentration of PPEs in the casting solution was controlled carefully to prevent excimer formation. We found that the structure of the sidechains of the PPEs strongly influence the range of the relative humidity at which controlled pore generation occurs, which could be rationalized from interfacial energies calculated from contact angle measurements. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03939DOI Listing
February 2019

Control of Potential Response to Small Biomolecule with Electrochemically Grafted Aryl-Based Monolayer in Field-Effect-Transistor-Based Sensor.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

In this paper, we demonstrate the use of a monolayer film electrografted via diazonium chemistry for controlling the potential response of field-effect transistor (FET)-based sensor. A 4-nitrobenzenediazonium (NBD) salt is electrografted on an extended-Au-gate FET (EG-Au-FET) with or without using a radical scavenger by cyclic voltammetry (CV), resulting in the formation of a monolayer or multilayer. In particular, the surface coverage of the aryl-derivative monolayer on the Au gate electrode gradually increases with increasing number of potential cycles in CV. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00085DOI Listing
February 2019

Tuning c-Axis Orientation of Calcium Phosphate Hybrid Thin Films Using Polymer Templates.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

The orientation of the c-axis in octacalcium phosphate (OCP) nanocrystals that were incorporated into hybrid thin films were successfully tuned using poly(vinyl alcohol) (PVA) thin-film templates of varying thickness. This approach was inspired by biomineralization. Thicker PVA templates enhanced the c-axis orientation of the OCP crystals perpendicular to the substrate. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04318DOI Listing
February 2019

In Situ Monitoring of Latex Film Formation by Small-Angle Neutron Scattering (SANS): Evolving Distributions of Hydrophilic Stabilizers in Drying Colloidal Films.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

The distribution of hydrophilic species, such as surfactants, in latex films is of critical importance for the performance of adhesives, coatings and inks, among others. However, the evolution of this distribution during the film formation process and in the resulting dried films remains insufficiently elucidated. Here, we present in situ (wet) and ex situ (dry) SANS experiments that follow the film formation of two types of latex particles, which differ in their stabilizer: either a covalently bonded poly(methacrylic acid) (PMAA) segment or a physically adsorbed surfactant (sodium dodecyl sulfate, SDS). Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04251DOI Listing
February 2019

Nanotribological properties of ALD-made ultrathin MoS2 influenced by film thickness and scanning velocity.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

Solid-lubricanting films are usually applied to reduce friction and adhesion of micro/nanoelectromechanical systems (MEMS/NEMS). Due to the special structure, MoS2 is endowed with excellent lubricity. Layer-controlled ultrathin MoS2 films with strong interactions to the underlying substrates were prepared by atomic layer deposition (ALD) using MoCl5 and H2S and characterized by various measures. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03970DOI Listing
February 2019

Facile Preparation of Hierarchical C/RGO/FeOx Composite with Superior Microwave Absorption Performance.

Langmuir 2019 Feb 19. Epub 2019 Feb 19.

Hierarchical carbon/reduced graphene oxide /FeOx (CGF) composite has been successfully prepared utilizing a sequential process of immersion and carbonization. During the immersion of melamine foam in liquid precursor, the graphene oxide covers on the interconnected framework of foam and is decorated by metallic ions simultaneously. Therefore, the hierarchical structure is constructed in one step. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04276DOI Listing
February 2019

Study of Cu (II), Co (II), Ni (II) and Pb (II) removal from aqueous solutions using magnetic Prussian blue nano-sorbent.

J Hazard Mater 2019 Feb 11;369:226-235. Epub 2019 Feb 11.

Center for Physical Sciences and Technology, Savanorių ave. 231, LT-02300 Vilnius, Lithuania.

In this study magnetic Prussian blue (MPB) was synthesized and applied as sorbent for the efficient removal of heavy metals (Cu (II), Co (II), Ni (II) and Pb (II)) from aqueous solution. The average diameter of nanoparticles was found to be about 15 nm. The experimental results were fitted to Langmuir, Freundlich and Dubinin-Radushkevich models with high regression coefficients. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2019.02.039DOI Listing
February 2019

3D hierarchical graphene oxide-NiFe LDH composite with enhanced adsorption affinity to Congo red, methyl orange and Cr(VI) ions.

J Hazard Mater 2019 Feb 6;369:214-225. Epub 2019 Feb 6.

Department of Science and Environmental Studies and State Key Laboratory in Marine Pollution, The Education University of Hong Kong, Tai Po, N. T. Hong Kong, PR China. Electronic address:

Three-dimensional (3D) hierarchical graphene oxide-NiFe layered double hydroxide (GO-NiFe LDH) composite with sandwich-like structure is fabricated using a facile one-pot hydrothermal reaction. Electron microscopy images demonstrate that the GO-NiFe LDH composite possesses a highly porous and well-ordered structure. Both sides of the GO are fully covered by the LDH nanosheets, resulting in the sandwich-like architecture. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2019.02.013DOI Listing
February 2019

Collagenic waste and rubber based resin-cured biocomposite adsorbent for high-performance removal(s) of Hg(II), safranine, and brilliant cresyl blue: A cost-friendly waste management approach.

J Hazard Mater 2019 Feb 4;369:199-213. Epub 2019 Feb 4.

Advanced Polymer Laboratory, Department of Polymer Science and Technology and Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake, Kolkata, 700106, West Bengal, India. Electronic address:

Goat buffing dust (GBD), an abundantly available collagenic-waste and crosslinked styrene butadiene rubber (SBR)-based scalable biocomposite showing excellent physicochemical properties and reusability was synthesized via systematic optimization of torque and time for exclusion(s) of dyes, such as safranine (SF) and brilliant cresyl blue (BCB), and Hg(II). The GBD-aided non-sulfur curing of SBR was attempted via chromane mechanism-based reaction between resin components of GBD and pendant ̶ C=C ̶ of SBR. The decrease in the relative extent of unsaturation in cured-SBRGBD, alteration of crystallinity, surface properties, elevated thermal stabilities, and ligand-selective superadsorption were inferred through extensive microstructural analyses of unadsorbed and/or adsorbed SBRGBD using C NMR, O1s-/N1s-/C1s-/Hg4f-XPS, FTIR, UV-vis, TGA, XRD, FESEM, and EDX. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2019.02.004DOI Listing
February 2019

Recombinant expression and purification of a functional bacterial metallo-chaperone PbrD-fusion construct as a potential biosorbent for Pb(II).

Protein Expr Purif 2019 Feb 15. Epub 2019 Feb 15.

School of Molecular and Cell Biology, University of Witwatersrand, Private Bag 3, Wits, 2050, Johannesburg, South Africa; Department of Biotechnology and Food Technology, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, Johannesburg, South Africa.

PbrD is a lead (II) binding protein encoded by the pbr lead resistance operon found exclusively in Cupriavidus metallidurans CH34. Its ability to sequester Pb(II) shows potential for it to be developed as a biosorbent for Pb in the bioremediation of contaminated wastewaters. In this study the pbrD gene from C. Read More

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http://dx.doi.org/10.1016/j.pep.2019.02.008DOI Listing
February 2019

Confinement induced alteration of morphologies of oil-water emulsion.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Reversible alteration between different emulsion morphologies like core-shell and Janus is conventionally triggered by altering the interfacial energy between different phases. In contrast, here we show that the morphology of dispersed droplets can change also when the emulsion is sufficiently confined between two parallel plates. In particular we use three immiscible phases: silicone oil, paraffin oil and aqueous solution of surface active agents like Agarose, SDS, AOT, CTAB to generate oil in water emulsion consisting of complex morphologies of the dispersed droplets. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00067DOI Listing
February 2019

Pt Nanoparticles Loaded Graphene Aerogel Microspheres with Excellent Methanol Electrooxidation Performance.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Platinum-decorated graphene aerogel microspheres were fabricated through a combined electrospraying, freeze-casting and solvothermal process. Platinum nanoparticles with a narrow size distribution are evenly anchored on the graphene aerogel microspheres without agglomeration benefitting from the distinct center-diverging microchannel structure of the graphene aerogel microspheres, which results in the as-prepared catalysts presenting excellent electrocatalytic performance including high electrocatalytic activity and high poison tolerance towards methanol electrooxidation, showing great potential for direct methanol fuel cell anode catalysts. In particular, the Platinum-decorated graphene aerogel microspheres exhibits an extremely high mass activity of 1098. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00021DOI Listing
February 2019

Chemical reaction-driven spreading of organic extractant on gas-water interface: Insight into controllable formation of gas bubble-supported organic extractant liquid membrane.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attract extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of gas bubbles to form a layer of gas bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that, for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is how to control the formation of stable organic liquid membrane covered on the surface of gas bubbles. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03954DOI Listing
February 2019
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Wetting criteria of intrinsic contact angle to distinguish between hydrophilic and hydrophobic micro/nano-textured surfaces: Experimental and theoretical analysis with synchrotron X-ray imaging.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

In this study, existing knowledge on the wetting criterion, i.e., the intrinsic contact angle, for distinguishing between hydrophilic and hydrophobic textured surfaces is verified experimentally. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03407DOI Listing
February 2019

Preparation of a core-double shell chitosan-graphene oxide composite and investigation of Pb (II) absorption.

Heliyon 2019 Jan 31;5(1):e01177. Epub 2019 Jan 31.

Department of Chemistry, University of Southern Indiana, 8600 University Boulevard, Evansville, IN, 47712, USA.

The need for new and impactful materials to address the global problem of water pollution continues to be driving force in chemical research. This report presents the preparation of a core-double shell composite consisting of sand base substrate onto which sequential layers of chitosan and graphene oxide (GO) are deposited. The adsorption characteristics of this material for Pb (II) from aqueous solutions is investigated. Read More

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http://dx.doi.org/10.1016/j.heliyon.2019.e01177DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6360341PMC
January 2019

Tracing size and surface chemistry dependent endosomal uptake of gold nanoparticles using surface-enhanced Raman scattering.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Surface-enhanced Raman scattering (SERS) based-single cell analysis is an emerging approach to obtain molecular level information from molecular dynamics in a living cell. In this study, endosomal biochemical dynamics was investigated based on size and surface chemistry dependent uptake of gold nanoparticles (AuNPs) on single cells over time using SERS. MDA-MB-231 breast cancer cells were exposed to 13 nm and 50 nm AuNPs and their poly-Adenine oligonucleotide modified forms by controlling the order and combination of AuNPs. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03988DOI Listing
February 2019

Eu3+-Controlled Fluorescent Bilayer Vesicles.

Langmuir 2019 Feb 16. Epub 2019 Feb 16.

By appropriate substitution, polyoxometalates (POMs) can be modified to be organic-inorganic supramolecules (OISMs) that are nonaqueous or water soluble and form aggregates in solution. Here we report a new OISM, (TBA)3POM-PPCT, that can self-assemble to form bilayer vesicles controlled by Eu3+ in nonaqueous solution. Dynamic laser light scattering (DLS), transmission and scanning electron microscopies (SEM and TEM) and atomic force microscopy (AFM) clearly demonstrated the controllable formation of stable bilayer vesicles with an average hydrodynamic radius of about 510 nanometers. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00302DOI Listing
February 2019

Interface Engineering of Fully Metallic Stent Enabling Controllable H2O2 Generation for Antirestenosis.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Despite significant advances in the design of metallic materials for bare metal stents (BMSs), restenosis induced by the accumulation of smooth muscle cells (SMCs) has been a major constraint on improving the clinical efficacy of stent implantation. Here, a new strategy for avoiding this issue utilizing hydrogen peroxide (H2O2) generated by the galvanic coupling of nitinol (NiTi) stents and biodegradable magnesium-zinc (Mg-Zn) alloys is reported. The amount of H2O2 released is carefully optimized via the biodegradability engineering of the alloys and by controlling the immersion time to selectively inhibit the proliferation and function of SMCs without harming vascular endothelial cells (VECs). Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03753DOI Listing
February 2019

Droplet microarray on patterned butterfly wing surfaces for cell spheroid culture.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Three-dimensional (3D) cell spheroids have a demonstrated value for in vitro biological research and therapeutics development. Attempts to this technique focus on the developing of effective methods for fabricating cell spheroids. Here, inspired by the heterogeneously textured wettability bumps (with hydrophilic peaks and hydrophobic bases) of Stenocara beetle, we present a bio-templated substrate with wettable hydrogel arrays for culturing the cell spheroids. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03884DOI Listing
February 2019

Surface Deposition of Juglone-Fe on Microporous Membranes for Oil-Water Separation and Dyes Adsorption.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Deposition of dopamine and tannic acid has received great attention in the fields of surface and interface science and technology. The deposition behaviors of various metal-phenolic systems have been investigated, and it is generally accepted that at least one catechol group is essential to the formation of the coatings. Herein, we report a novel and effective surface coating system based on the coordination complexes of FeIII ions with a natural product juglone that contains only one phenolic hydroxyl. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03914DOI Listing
February 2019

Styrene-maleic acid copolymers form SMALPs by pulling lipid patches out of the lipid bilayer.

Langmuir 2019 Feb 18. Epub 2019 Feb 18.

Amphiphilic copolymers composed of styrene and maleic acid (SMA) monomers caused a major methodical breakthrough in the study of membrane proteins. They were found to directly release phospholipids and membrane proteins both from artificial and natural lipid bilayers yielding stable water-soluble discoidal SMA/lipid particles (SMALPs) of uniform size. Although many empirical studies indicate the great potency of SMALPs for membrane protein research, the mechanisms of their formation remain obscure. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03978DOI Listing
February 2019

Construction of magnetic lignin-based adsorbent and its adsorption properties for dyes.

J Hazard Mater 2019 Feb 10;369:50-61. Epub 2019 Feb 10.

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China.

The magnetic lignin-based adsorbent (FeO/C-ACLS) has been successfully prepared and applied to adsorbing azo dyes Congo red, Titan yellow and Eriochrome blue black R. The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), X-ray powder diffraction (XRD), vibration sample magnetometer (VSM), Raman spectroscopy and elemental analysis. In the process of adsorption, five kinds of influencing factors and recycling regeneration were discussed, and the adsorption mechanisms such as kinetics, isotherm, thermodynamics were explored. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2019.02.021DOI Listing
February 2019

Single-step pyrolysis of phosphoric acid-activated chitin for efficient adsorption of cephalexin antibiotic.

Bioresour Technol 2019 Feb 2;280:255-259. Epub 2019 Feb 2.

School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia. Electronic address:

Cephalexin (CFX) antibiotic, a potent pharmaceutical water pollutant, was efficiently removed by activated carbon (AC) derived from a single-step pyrolysis of phosphoric acid-activated chitin. Experimental conditions such as temperature, CFX initial concentration, and solution pH were screened in batch adsorption. Phosphoric acid activation of chitin and subsequent pyrolysis tailored the Brunauer-Emmett-Teller surface area, total pore volume, and average pore diameter to 1199. Read More

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http://dx.doi.org/10.1016/j.biortech.2019.02.003DOI Listing
February 2019

Comprehensive analysis on sorptive uptake of enrofloxacin by activated carbon derived from industrial paper sludge.

Sci Total Environ 2019 Feb 8;665:438-452. Epub 2019 Feb 8.

Chemical Engineering Department, National Institute of Technology Durgapur, India. Electronic address:

The current investigation deals with how chemically activated carbon derived from industrial paper sludge (ACPS) performs on sorptive removal of enrofloxacin (ENF), an antibacterial drug from its water solution. Thermogravimetric (TGA) and proximate analysis of raw paper sludge (RPS) were conducted. ACPS was characterized with proximate analysis, XRD, FT-IR, SEM and BET. Read More

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http://dx.doi.org/10.1016/j.scitotenv.2019.02.081DOI Listing
February 2019

A choline chloride-acrylic acid deep eutectic solvent polymer based on FeO particles and MoS sheets (poly(ChCl-AA DES)@FeO@MoS) with specific recognition and good antibacterial properties for β-lactoglobulin in milk.

Talanta 2019 May 25;197:567-577. Epub 2019 Jan 25.

College of Pharmaceutical Science, Key Laboratory of Pharmaceutical Quality Control of Hebei Province, Hebei University, Baoding 071002, China. Electronic address:

With the development of deep eutectic solvents (DESs), more DES-based functional materials have been explored and applied in various areas. In this work, a novel choline chloride-acrylic acid (ChCl-AA) DES polymer, on a 2D magnetic base, was prepared for the recognition of β-lactoglobulin (β-LG) biomacromolecules in milk and for the inhibition of common bacteria such as Escherichia coli (E. coli), Pseudomonas fluorescens (P. Read More

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http://dx.doi.org/10.1016/j.talanta.2019.01.072DOI Listing
May 2019
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Adsorption of cerium (III) by HKUST-1 metal-organic framework from aqueous solution.

J Colloid Interface Sci 2019 Jan 31;542:421-428. Epub 2019 Jan 31.

Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, China.

Cerium is an important rare earth element (REE), which can be used for many high-tech applications. From the industrial and environmental viewpoints, it is imperative to recover Ce ions from aqueous solution. Herein, HKUST-1 metal-organic framework (MOF) was applied for adsorption and recovery of Ce from aqueous solution. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.01.117DOI Listing
January 2019
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High-resolution label-free studies of molecular distribution and orientation in ultrathin, multicomponent model membranes with infrared nano-spectroscopy AFM-IR.

J Colloid Interface Sci 2019 Feb 6;542:347-354. Epub 2019 Feb 6.

Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland.

Biological membranes are undoubtedly very interesting systems. Unfortunately, their analysis is very complicated and therefore simplified artificial models, like Langmuir monolayers, are frequently applied. In this work a novel method of label-free monomolecular films analysis based on infrared nano-spectroscopy (AFM-IR) is presented. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.02.016DOI Listing
February 2019
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Valorization of manganese-containing groundwater treatment sludge by preparing magnetic adsorbent for Cu(II) adsorption.

J Environ Manage 2019 Feb 12;236:446-454. Epub 2019 Feb 12.

Science and Technology Innovation Center for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun 130117, China; Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.

Mn-containing sludge from groundwater treatment was converted to magnetic particles (MPs) via a one-step hydrothermal method using sodium ascorbate (SA) as the reductant. The MPs were characterized by X-ray diffraction spectroscopy, Mössbauer spectroscopy, X-ray fluorescence spectroscopy, magnetometry and Gran titration and the results showed that magnetic jacobsite was obtained as an intermediate product in transformation of Fe/Mn oxides to siderite and rhodochrosite. When the molar ratio of SA to Mn in the sludge was two, the produced MPs-2 contained a mixture of ferrihdyrite, hematite, jacobsite and Si/Al oxides, and could magnetize at 2. Read More

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http://dx.doi.org/10.1016/j.jenvman.2019.01.117DOI Listing
February 2019