42,516 results match your criteria Langmuir : the ACS journal of surfaces and colloids[Journal]


Enhancing Electrochemical Efficiency of Hydroxyl Radical Formation on Diamond Electrodes by Functionalization with Hydrophobic Monolayers.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

Electrochemical formation of high-energy species such as hydroxyl radical in aqueous media is inefficient because oxidation of HO to form O is a more thermodynamically favorable reaction. Boron-doped diamond (BDD) is widely used as an electrode material for generating ∙OH radicals because it has a very large kinetic overpotential for O production, thus increasing electrochemical efficiency for ∙OH production. Yet, the underlying mechanisms of O and ∙OH production at diamond electrodes are not well understood. Read More

View Article
December 2018

High-Performance Synthesis of Phosphorus-Doped Graphene Materials and Stabilization of Phosphoric Micro- and Nanodroplets.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt, 47 , Moscow 119991 , Russia.

A thermally induced cascade process leading to the formation of stable micro- and nanometer-size phosphoric droplets was developed starting from a molecular precursor. Microwave-induced pyrolysis of 1,2,3,4,5-pentaphenylphosphole oxide proceeded through a series of subsequent transformations involving formation of phosphorus-doped graphene oxide layers, seeding of carbon surface with phosphorus centers, and assembling of stable droplets. A complex nanostructured organization of the material was established in a remarkably short time of 3 min, and the process was performed in a thermally induced manner using microwave irradiation. Read More

View Article
December 2018

Investigation of Electromagnetic Resonance Rewarming Enhanced by Magnetic Nanoparticles for Cryopreservation.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

The lack of effective rewarming technique restricted the successful cryopreservation of organ or large tissues by vitrification. The conversion of electromagnetic (EM) energy into heat provides a possible solution for the rewarming process for the cryopreservation. In this work, an EM resonance rewarming system was set up with dynamic feedback control and power feeding optimization. Read More

View Article
December 2018

Enhanced photocatalytic simultaneous removals of Cr(VI) and bisphenol A over Co(II)-modified TiO2.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

To enhance the electron-hole separation and boost the practical performance of commercial titania (Degussa P25) under natural solar light, in this work, P25 was modified with Co(II) species (CoP25) through post-treatment with decomposition of Co-EDTA precursors in a wet chemical anchoring process. With appropriate Co(II) loading amount as molecular cocatalyst, the resulted CoP25-4 showed significantly improved photocatalytic performance for Cr(VI) reduction and bisphenol A (BPA) oxidation under UV-light irradiation. The co-existence of Cr(VI) and BPA promoted mutually the degradation of both pollutants. Read More

View Article
December 2018

Ultra-High Evaporative Heat Fluxes in Nano-Confined Geometries.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

Advancement in high-performance photonics/electronics devices has amplified generated thermal energy making thermal management a bottleneck for the accelerated innovation in these disciplines. While various methods have been used to tackle the thermal management problem, evaporation with nanometer fluid thickness is one of the most promising approaches for future technological demands. Here, we studied thin-film evaporation in nanochannels under absolute negative pressure in both transient and steady-state conditions. Read More

View Article
December 2018

Atypical Film-Forming Behavior of Soluble Tetra-3-Nitro-Substituted Copper Phthalocyanine.

Chemphyschem 2018 Dec 12. Epub 2018 Dec 12.

Institute of Solution Chemistry Russian Academy of Sciences, I-8, Akademicheskaya Str., 1, 153045, Ivanovo, RUSSIAN FEDERATION.

Thin films of metal phthalocyanines (MPc) are known to exhibit excellent physical properties but poorly controlled morphologies. Therefore, the present work seeks to understand the film growth mechanism of a model compound for potentially usable MPc, specifically, copper tetra(3-nitro-5-tert-butyl)phthalocyanine (CuPc*). The Langmuir-Schaefer (LS) technique was applied to prepare a series of CuPc* films under different processing conditions. Read More

View Article
December 2018

Fluorocarbon Exposure Mode Markedly Affects Phospholipid Monolayer Behavior at the Gas/Liquid Interface. Impact on Size and Stability of Microbubbles.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

Although most phospholipid-shelled microbubbles (MBs) investigated for medical applications are stabilized by a fluorocarbon (FC) gas, information on the interactions between phospholipid and FC molecules at the gas/water interface remains scarce. We report that the procedure of introduction of perfluorohexane (F-hexane), that is, either in the gas phase above dimyristoylphosphatidylcholine (DMPC) or dipalmitoylphosphatidylcholine (DPPC) Langmuir monolayers, or in the aqueous sub-phase, radically affects the compression isotherms. When introduced in the gas phase, F-hexane is rapidly incorporated in the interfacial film but is also readily desorbed upon compression and eventually totally expelled from the phospholipid monolayers. Read More

View Article
December 2018

Interaction of membrane palmitoylated protein-1 with model lipid membranes.

Gen Physiol Biophys 2018 Sep;37(6):603-617

Department of Cytobiochemistry, Faculty of Biotechnology, University of Wrocław, 50-383 Wrocław, Poland.

Membrane palmitoylated protein-1 (MPP1) plays an important role in the formation of raft domains in erythroid membranes. We have shown recently that MPP1 interacts with membrane lipids composed of dioleoylphosphatidylcholine (DOPC), sphingomyelin (SM) and cholesterol. Here we further extend this investigation. Read More

View Article
September 2018

Removal of Heavy Metal Ions from Household Drinking Water Using Acacia Galpinii Seeds and Seed Pods.

J Health Pollut 2016 Dec 22;6(12):7-14. Epub 2016 Dec 22.

Department of Applied Chemistry, Faculty of Applied Sciences, National University of Science and Technology, Zimbabwe.

Background: Contamination of drinking water with heavy metals poses a human health threat, particularly in low-income countries where point-of-use water purification systems are beyond the reach of a majority of households.

Objectives: The study was undertaken to evaluate the efficacy of Acacia galpinii (monkey thorn tree) biomass in removing lead (Pb (ll)), cadmium (Cd (ll)), calcium (Ca (ll)), and magnesium (Mg (ll)) ions from drinking water.

Methods: A. Read More

View Article
December 2016

New Insight into Sperm Capacitation: A Novel Mechanism of 17β-Estradiol Signalling.

Int J Mol Sci 2018 Dec 12;19(12). Epub 2018 Dec 12.

Laboratory of Reproductive Biology, Institute of Biotechnology CAS, v.v.i., BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic.

17β-estradiol (estradiol) is a natural estrogen regulating reproduction including sperm and egg development, sperm maturation-called capacitation-and sperm⁻egg communication. High doses can increase germ cell apoptosis and decrease sperm count. Our aim was to answer the biological relevance of estradiol in sperm capacitation and its effect on motility and acrosome reaction to quantify its interaction with estrogen receptors and propose a model of estradiol action during capacitation using kinetic analysis. Read More

View Article
December 2018

Corrosion inhibition of X65 steel in sulfuric acid by two food flavorants 2-isobutylthiazole and 1-(1,3-Thiazol-2-yl) ethanone as the green environmental corrosion inhibitors: Combination of experimental and theoretical researches.

J Colloid Interface Sci 2018 Dec 6;538:519-529. Epub 2018 Dec 6.

Bomin Electronics Ltd, Meizhou 514021, China.

Food flavors of 2-isobutylthiazole (ITT) and 1-(1,3-Thiazol-2-yl)ethanone (TEO) for the corrosion inhibition of X65 steel in HSO were studied by electrochemical methods, atomic force microscopy (AFM), scanning electron microscopy (SEM) and theoretical calculations. Electrochemical experiments show that ITT and TEO can effectively inhibit the corrosion of cathode and anode of X65 steel, and they are mixed-type corrosion inhibitors. Surface topography analysis (SEM and AFM) also visually demonstrate that ITT and TEO form an effective barrier film on the X65 steel surface to isolate the corrosive medium. Read More

View Article
December 2018
1 Read

Efficiency and mechanism of adsorption of low concentration uranium in water by extracellular polymeric substances.

J Environ Radioact 2018 Dec 10;197:81-89. Epub 2018 Dec 10.

School of Resources and Environment Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.

Extracellular polymeric substances (EPS) of uranium adsorbent was first extracted from the aerobic activated sludge of municipal wastewater treatment plant as raw material. The structure and surface morphology of EPS was characterized by FTIR, SEM-EDX, 3D-EEM, and XPS. The 3D-EEM spectra of EPS revealed that there are Tryptophan-like protein and Humus which can adsorb uranium in the EPS. Read More

View Article
December 2018

An intermolecular forces model for lipid microbubble shells.

Langmuir 2018 Dec 13. Epub 2018 Dec 13.

Lipid-coated microbubbles are currently used clinically as ultrasound contrast agents for echocardiography and radiology, and are being developed for many new diagnostic and therapeutic applications. Accordingly, there is a growing need to engineer specific formulations by employing rational design to guide lipid selection and processing. This approach requires a quantitative relationship between lipid chemistry and interfacial properties of the microbubble shell. Read More

View Article
December 2018

Tailored Functional Surfaces using Nanoparticle and Protein "Nanobrick" Coatings.

Langmuir 2018 Dec 13. Epub 2018 Dec 13.

Surface properties are an essential feature for a wide range of functional materials. In this article, we summarize strategies developed in our group that employ nanoparticles and proteins as nanobricks to create thin-film coatings on surfaces. These coatings contain tailorable surface functionality based on the properties of the predesigned nanobricks, parlaying both the chemical and structural features of the precursor particles and proteins. Read More

View Article
December 2018

Introduction of Positive Charges into Zwitterionic Phospholipid Monolayers Disrupts Water Structure Whereas Negative Charges Enhances It.

J Phys Chem B 2018 Dec 13. Epub 2018 Dec 13.

The interfacial water structure and phosphate group hydration of 1,2-dioleoyl- sn-glycero-3-phosphatidylcholine monolayers were investigated at air/water interfaces. Both vibrational sum frequency spectroscopy (VSFS) and Langmuir monolayer compression measurements were made. The PC lipids oriented water molecules predominantly through their phosphate-choline (P-N) dipoles and carbonyl moieties. Read More

View Article
December 2018

A dirty story: Improving colloidal monolayer formation by understanding the effect of impurities at the air/water interface.

Langmuir 2018 Dec 13. Epub 2018 Dec 13.

Colloidal monolayers are important tools to fabricate surface structures at the nanoscale. A typical monolayer fabrication strategy involves the self-assembly of colloidal building blocks at liquid interfaces, which are subsequently deposited on a solid substrate. Even though this process is well established, the resulting order of the particles within the colloidal monolayer differs between batches of colloidal particles and can even change with the age of the dispersion. Read More

View Article
December 2018

Spontaneous Displacement of High Viscosity Micron Size Oil Droplets from a Curved Solid in Aqueous Solutions.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

Spontaneous displacement of high viscosity (~103 Pas) micron size oil droplets from a curved solid in aqueous solutions was investigated. For high viscosity oils, the dynamic droplet shape was found to deviate significantly from a spherical cap shape due to the considerable viscous force in the oil phase. The displacement dynamics of high viscosity droplets were analyzed using molecular kinetic and hydrodynamic models. Read More

View Article
December 2018

Structure Formation in Class I and Class II Hydrophobins at the Air-Water Interface under Multiple Compression/Expansion Cycles.

ChemistryOpen 2018 Dec 21;7(12):1005-1013. Epub 2018 Nov 21.

Institut für Chemie Martin-Luther-Universität Halle-Wittenberg Von-Danckelmann-Platz 4 06120 Halle/Saale Germany.

Hydrophobins are small amphiphilic fungal proteins empirically divided into two classes. We investigated the self-assembled structures of class I SC3 from and class II HFBII from transferred to mica from the air-water interface by using the Langmuir-Schaefer (LS) technique and atomic force microscopy (AFM). The main focus is the influence of areal constraint and multiple compressions and expansions on the morphology of the protein films. Read More

View Article
December 2018

Adsorption of Potentially Toxic Metals from Mono and Multi-Metal Systems Using Groundnut and Shea Nut Shell Biochars.

J Health Pollut 2018 Jun 11;8(18):180602. Epub 2018 Jun 11.

Department of Ecotourism and Environmental Management, Faculty of Natural Resources and Environment, University for Development Studies, Tamale, Ghana.

Background: Adsorption is a unique and promising method for the removal of trace metals from an aqueous environment using cost-effective and readily available biochars.

Objective: The present study examined mono and simultaneous adsorption of cadmium (Cd), mercury (Hg) and lead (Pb) onto biochars produced at pyrolysis temperatures of 350 ± 5°C and 700 ± 5°C.

Methods: Fifty mg/l of trace metal ions with 2 g/50 ml of adsorbent dosage were leached at constant room temperature of 24 ± 0. Read More

View Article

Adsorption and Aggregation Properties of Some Polysorbates at Different Temperatures.

J Solution Chem 2018 26;47(11):1824-1840. Epub 2018 Oct 26.

Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.

Measurements of the surface tension of aqueous solutions of polysorbates (Tween 20, Tween 60 and Tween 80) at 293, 303 and 313 K were made. On the basis of the obtained results the Gibbs surface excess concentration of the Tweens at the water-air interface and critical micelle concentrations were determined. Knowing the Gibbs surface excess concentration and taking into account the difference between the limiting area occupied by water and Tween molecules at the water-air interface, the fraction occupied by Tween molecules was established. Read More

View Article
October 2018

Tuning the electronic structure of single-walled carbon nanotube by high-pressure H exposure.

Nanotechnology 2018 Dec 7;30(6):065201. Epub 2018 Dec 7.

Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.

We report on an electronic structure change of single-walled carbon nanotube (SWNT) on hexagonal boron nitride due to electron doping via high-pressure H exposure. The fractional coverage of hydrogenated carbon atom is estimated to be at least θ = 0.163 from the in situ I -V measurements of the release process. Read More

View Article
December 2018

Collagen type-IV Langmuir and Langmuir-Schäfer layers as model biointerfaces to direct stem cell adhesion.

Biomed Mater 2018 Nov 27. Epub 2018 Nov 27.

Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Kantstr. 55, Teltow, 14513, GERMANY.

In biomaterial development, the design of material surfaces that mimic the extra-cellular matrix (ECM) in order to achieve favorable cellular instruction is rather challenging. Collagen-type IV (Col-IV), the major scaffolding component of Basement membranes, a specialized ECM with multiple biological functions, has the propensity to form networks by self-assembly and supports adhesion of cells such as endothelial cells or stem cells. The preparation of biomimetic Col-IV network like layers to direct cell responses is difficult. Read More

View Article
November 2018

Tuning the electronic structure of single-walled carbon nanotube by high-pressure H2 exposure.

Nanotechnology 2018 Nov 15. Epub 2018 Nov 15.

Department of Physics, Seoul National University, Seoul 151-747, KOREA, Seoul, KOREA, REPUBLIC OF.

We report on an electronic structure change of single-walled carbon nanotube (SWNT) on hexagonal boron nitride (h-BN) due to electron doping via high-pressure H<sub>2</sub> exposure. The fractional coverage of hydrogenated carbon atom is estimated to be at least <i>θ</i> = 0.163 from the in situ <i>I</i><sub>ds</sub>-<i>V</i><sub>g</sub> measurements of the release process. Read More

View Article
November 2018

pH-Responsive Pickering Foams Generated by Surfactant-Free Soft Hydrogel Particles.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

Pickering foams are foams stabilized by particles and are generally known to have a good stability. A special sub-class of particle stabilized foams is the stimuli-responsive Pickering foams that can be formed or de-constructed by applying an external stimuli or changing the environmental conditions; such intelligent particles could find use in many practical applications. Here, we synthesized the surfactant-free biocompatible poly[2(diethylamino)ethylmethacrylate] (PDEAEMA) hydrogel particles (HGPs) by emulsion polymerization. Read More

View Article
December 2018
1 Read

Engineered 3D microvascular networks for the study of ultrasound-microbubble-mediated drug delivery.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

Localized and targeted drug delivery can be achieved by the combined action of ultrasound, and microbubbles on the tumor microenvironment, likely through sonoporation and other therapeutic mechanisms not well understood. Here, we present a perfusable in vitro model with a realistic 3D geometry to study the interactions between microbubbles and the vascular endothelium in the presence of ultrasound. Specifically, a three-dimensional, endothelial-cell-seeded in vitro microvascular model was perfused with cell culture medium and microbubbles while sonicated by a single-element 1 MHz focused transducer. Read More

View Article
December 2018

Markov Chain Modelling of Surfactant Critical Micelle Concentration and Surface Composition.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

A Markov chain (MC) model has been used to model the following binary surfactant mixtures: linear alkylbenzene sulfonate (LAS4)/octaethylene glycol monododecyl ether (C12E8) at 10oC and 25oC, LAS6/acidic sophorolipid (AS), C12 betaine/C12 maltoside, sodium lauryl ether sulfate (SLES2)/C12E8, and rhamnolipid (R1)/LAS6. The critical micellar concentration and the composition of the adsorbed layer, for each system, can be modelled using the same monomer reactivity ratio values, g1 and g2. This implies that the interactions between the surfactants in the bulk solution and at the interface are the same, within error. Read More

View Article
December 2018

The nature of binding of quinolate complex on the surface of ZnS quantum dots.

Phys Chem Chem Phys 2018 Dec 12. Epub 2018 Dec 12.

Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India. and Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.

We report that the Z-type binding rather than X-type binding was favored when 8-hydroxyquinoline (HQ) reacted with presynthesized ZnS quantum dots (Qdots) to form surface zinc quinolinate complexes having a preferred stoichiometry of 1 : 2 (surface Zn2+ : HQ). Importantly, the higher solubility in polar solvents and high desorption coefficient (following Langmuir binding isotherm) of HQ-treated ZnS Qdot in DMSO solvent compared with those in methanol clearly indicated the favorable Z-type binding of HQ and thus the formation of surface octahedral ZnQ2 complex. Furthermore, the characteristics peaks in the 1H-nuclear magnetic resonance (NMR) spectrum of the desorbed species and the ligand density calculation of the surface complex (formed due to the reaction between HQ and ZnS Qdot) supported the octahedral ZnQ2 complex formation. Read More

View Article
December 2018
2 Reads

Cation Exchange at the Interfaces of Ultrathin Films of Fluorous Ionic Liquids on Ag(111).

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

In the context of applications with thin ionic liquid (IL) films on solid supports, we studied the ion distribution within mixed thin IL films by angle-resolved X-ray photoelectron spectroscopy. After deposition of 1-methyl-3-octylimidazolium hexafluorophosphate, [CCIm][PF], on top of a wetting layer (WL) of 3-methyl-1-(3,3,4,4,4-pentafluorobutyl)imidazolium hexafluorophosphate, [PFBMIm][PF], on Ag(111) at room temperature (RT), we find a preferential enrichment of the [PFBMIm] cation at the IL/vacuum interface. In a similar deposition experiment at 82 K, this cation exchange at the IL/solid interface does not occur. Read More

View Article
December 2018

Asphaltene Adsorption from Toluene onto Silica Through Thin Water Layers.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

Asphaltenes in crude oil play a pivotal role in reservoir oil production because they control rock-surface wettability. Upon crude-oil invasion into a brine-filled reservoir trap, rock adherence of sticky asphaltene agglomerates formed at the crude oil/brine interface can change the initially water-wet porous medium into mixed-oil wetting. If thick, stable water films coat the rock surfaces, however, asphaltenic-oil adhesion is thought to be prevented. Read More

View Article
December 2018

The London - van der Waals Force Field of a Chemically Patterned Surface to Enable Selective Adhesion.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

The London - van der Waals (L-vdW) force between a particle and a surface strongly depends on the topography and the chemical properties of the interacting surfaces. While a great deal of work has been done to understand the effect of topographical heterogeneity on the L-vdW adhesion, the role of chemical heterogeneity has been discussed only rarely. This study makes an attempt to quantify the magnitude and range of the L-vdW force acting on a spherical particle in the vicinity of a chemically patterned surface. Read More

View Article
December 2018

Kinetics, Thermodynamics, and Competitive Adsorption of Heavy Metals from Water Using Orange Biomass.

Water Environ Res 2018 Dec;90(12):2114-2125

Adsorption of heavy metals on modified orange biomass has been studied. This biomass was treated with NaOH and CaCl₂ to improve its adsorption properties. Kinetic and thermodynamic studies of the adsorption of Cd, Ni, Cu, and Zn were performed at different operating conditions, including competitive adsorption studies with binary metallic mixtures. Read More

View Article
December 2018

Trypsin-Immobilized Silica: A Novel Adsorbent for V(IV) and V(V) Removal from Water.

Water Environ Res 2018 Dec;90(12):2056-2065

In the present study, trypsin-immobilized silica was employed for the removal of V(IV) and V(V) ions from water. The synthesized sorbent was first characterized and then investigated for the removal of V(IV) and V(V) under various experimental conditions. The adsorption performance of the sorbent was tested as a function of pH, sorbent amount, initial vanadium concentration, contact time, and temperature. Read More

View Article
December 2018

The impact of a hyaluronic acid-grafted layer on the surface properties of model silicone hydrogel contact lenses.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

The introduction of high oxygen transmissibility silicone hydrogel lenses ameliorated hypoxia-related complications, making them the most prescribed type of contact lens. Despite the progress made over the last two decades to improve their clinical performance, symptoms of ocular dryness and discomfort and a variety of adverse clinical events are still reported. Consequently, the rate of contact lens wear discontinuation has not been appreciably diminished by their introduction. Read More

View Article
December 2018

Continuous Langmuir-Blodgett deposition and transfer by controlled edge-to-edge assembly of floating 2D materials.

Langmuir 2018 Dec 12. Epub 2018 Dec 12.

The Langmuir-Blodgett technique is one of the most controlled methods to deposit monomolecular layers of floating or surface active materials but has lacked the ability to coat truly large area substrates. In this work, by manipulating single layer dispersions of graphene oxide (GO) and thermally exfoliated graphite oxide (TEGO) into water-immiscible spreading solvents, unlike traditional Langmuir-Blodgett deposition which requires densification achieved by compressing barriers, we demonstrate the ability to control the 2D aggregation and densification behavior of these floating materials using a barrier-free method. This is done by controlling the edge-to-edge interactions through modified sub-phase conditions and by utilizing the distance-dependent spreading pressure of the deposition solvent. Read More

View Article
December 2018

Probing wettability alteration of boron nitride surface through rheometry.

Langmuir 2018 Dec 11. Epub 2018 Dec 11.

While the surface of many ceramic particles is covered by positive and negative species, boron nitride displays no charge on surface. Nevertheless, the interest in boron nitride is rising: Little materials combine electrical insulation and high thermal conductivity; both properties are required for many applications, for instance in electronic devices and sensors. Hydroxyl (-OH) groups are usually created onto the surface to increase the hydrophilicity of particles. Read More

View Article
December 2018

Adsorption Properties and Mechanism of Cd in Water by Zr-containing Silica Residue Purification.

Front Chem 2018 23;6:556. Epub 2018 Nov 23.

Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, China.

Zirconium (Zr)-containing silica residue purification (ZSR-P) discharged from industrial production of ZrOCl was used as an adsorbent, and CdCl solution was used as the simulated wastewater containing cadmium ions (Cd). The properties and mechanisms of ZSR-P absorbing Cd were studied. The results showed that ZSR-P had a good effect on the adsorption and removal of Cd in water. Read More

View Article
November 2018

Dynamically evolving surface patterns through light-triggered wrinkling erasure.

Langmuir 2018 Dec 11. Epub 2018 Dec 11.

For many applications, it is an imperative that changes in polymer surface topography, especially periodic patterns, can be triggered on command by a well-defined remote signal. In this contribution, we report a light-induced cascade of changes in wrinkling wavelengths on thin polymer layers supported by an elastomeric substrate under tensile stress. Through the applied supramolecular design, the effect of varying the ratio of light active and light passive components can be easily assessed, and it is shown that both the cascade type as well as the rate of the progress of the dynamic light-induced changes can be tuned by this ratio, as well as by the light intensity. Read More

View Article
December 2018

Thin film chemical deposition techniques as a tool for fingerprinting of free fatty acids by MALDI-TOF-MS.

Anal Chem 2018 Dec 11. Epub 2018 Dec 11.

Metabolic fingerprinting is a powerful analytical technique, giving access to a high-throughput identification and relative quantification of multiple metabolites. Due to short analysis times, MALDI-TOF-MS is the preferred instrumental platform for fingerprinting, although its power in analysis of free fatty acids (FFAs) is limited. However, these metabolites are the biomarkers of human pathologies and indicators of food quality. Read More

View Article
December 2018
1 Read

Insight into the mechanism and factors on encapsulating basic model protein, lysozyme, into heparin doped CaCO.

Colloids Surf B Biointerfaces 2018 Nov 29;175:184-194. Epub 2018 Nov 29.

School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou, Zhejiang Province, 325035, PR China; Wenzhou Institute of Biomaterials and Engineering, CNITECH, CAS, Wenzhou, Zhejiang Province, 325001, PR China; Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province, Wenzhou Institute of Biomaterials and Engineering, CAS, Wenzhou, Zhejiang Province, 325001, PR China. Electronic address:

Porous CaCO microparticles are considered as one of the most popular and effective carriers for protein loading. Most of current studies have centered on elucidating particle formation and enhancing the protein loading efficiency, very few reports on the kinetics, driving forces and factors on protein loading process. Here, we took lysozyme as the basic model protein to investigate the kinetics, driving forces on protein loading and factors controlling loading efficiency into porous Hep/CaCO microparticles by various techniques (protein quantification assay, QCM-D, SEM, BET, Zeta sizer, TGA, CLSM, CD spectrum, bioactive assay). Read More

View Article
November 2018

Adsorptive removal of bisphenol A, chloroxylenol, and carbamazepine from water using a novel β-cyclodextrin polymer.

Ecotoxicol Environ Saf 2018 Dec 6;170:278-285. Epub 2018 Dec 6.

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, No. 1 Dongsan Road, Erxianqiao, Chengdu 610059, Sichuan, China.

The emerging organic micro-pollutants, such as bisphenol A (BPA), chloroxylenol (PCMX) and carbamazepine (CBZ), have raised concerns owing to their adverse impact on human health and ecological security. In this study, a novel cyclodextrin polymer (β-CDP) has been successfully prepared by nucleophilic substitution of β-cyclodextrin with tetrafluoroterephthalonitrile (TFP). The removal of three emerging organic micro-pollutants (BPA, CBZ and PCMX) by β-CDP under a single or mixture adsorption system was examined, and the adsorption behavior was investigated by adsorption kinetics and isotherm study. Read More

View Article
December 2018

Preparation of magnetic polyimide@ Mg-Fe layered double hydroxides core-shell composite for effective removal of various organic contaminants from aqueous solution.

Chemosphere 2018 Dec 3;219:66-75. Epub 2018 Dec 3.

Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, Hubei, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.

In this work, a novel core-shell structured magnetic polyimide@layered double oxides (LDO) composites coating a porous polyimide (PI)-coated FeO magnetic core and layered double hydroxide (LDH) has been successfully synthesized by solve-thermal synthesis and co-precipitation process. The magnetic PI@LDO composites were characterized by scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), thermogravimetry analysis (TGA) and magnetic properties analysis. The composite materials displayed core-shell structure with flower-like morphology. Read More

View Article
December 2018

A novel analytical approach towards in-vitro bile acid binding studies to Colesevelam Hydrochloride tablets: An ultra-high performance liquid chromatography tandem mass spectrometric method.

J Pharm Biomed Anal 2018 Nov 30;165:112-118. Epub 2018 Nov 30.

Department of Chemistry, Sunandan Divatia School of Science, NMIMS university, Mumbai, India.

Colesevelam hydrochloride is a bile acid sequestrant used as a low density lipoprotein (LDL) reducing agent in hyperlipidemia with an additional advantage to improve glycemic control in type 2 diabetes patients. The objective of the study was to develop and validate a liquid chromatography tandem mass spectroscopic method for the simultaneous in-vitro estimation of bile acid salts of Glycocholic acid (GC), Glycochenodeoxycholic acid (GCDC) and Taurodeoxycholic acid (TDC) and its application in performing in-vitro binding study with Colesevelam Hydrochloride tablets. The method was developed using C-18 (50 x 4. Read More

View Article
November 2018

Preparation of nanochitin-contained magnetic chitosan microfibers via continuous injection gelation method for removal of Ni(II) ion from aqueous solution.

Int J Biol Macromol 2018 Dec 6. Epub 2018 Dec 6.

College of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China; Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; Shanghai Genius Advanced Material Co., Ltd, Shanghai 201109, China. Electronic address:

In this study, nanochitin-contained magnetic chitosan (FPCC) microfibers were prepared successfully via continuous injection gelation method and employed to remove Ni(II) ion from aqueous solution. Firstly, FeO-nanoparticles were encapsulated into ε-caprolactam (CL) monomer solution in the presence of polystyrene (PSE), followed by CL anionic ring-opening polymerization and PSE removal, and obtained magnetic polyamide 6 (PA 6) microparticles (FP). After that, the economical FPCC microfibers can be prepared by adding FP microparticles and nanochitin (n-CT) into poly(vinyl alcohol)/chitosan hybrids (PVA/CTS). Read More

View Article
December 2018

Effect of precipitation pH and coexisting magnesium ion on phosphate adsorption onto hydrous zirconium oxide.

J Environ Sci (China) 2019 Feb 30;76:167-187. Epub 2018 Apr 30.

College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China. Electronic address:

To understand the effect of precipitation pH and coexisting Mg on phosphate adsorption onto zirconium oxide (ZrO), ZrO particles precipitated at pH 5.3, 7.1 and 10. Read More

View Article
February 2019

Evaluation of natural goethite on the removal of arsenate and selenite from water.

J Environ Sci (China) 2019 Feb 30;76:133-141. Epub 2018 Apr 30.

Department of Chemical Engineering, University of Wyoming, Laramie, WY 82071, USA. Electronic address:

Elevated arsenic and selenium concentrations in water cause health problems to both humans and wildlife. Natural and anthropogenic activities have caused contamination of these elements in waters worldwide, making the development of efficient cost-effective methods in their removal essential. In this work, removal of arsenate and selenite from water by adsorption onto a natural goethite (α-FeOOH) sample was studied at varying conditions. Read More

View Article
February 2019

Physical states and thermodynamic properties of model gram-negative bacterial inner membranes.

Chem Phys Lipids 2018 Dec 6;218:57-64. Epub 2018 Dec 6.

Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222, Terrasa, Spain. Electronic address:

Novel antimicrobial agents are focused to interact with the bacterial membrane whose lipid composition (number and position of unsaturations and lipid headgroup) is adapted according to environmental signals. The anticipation of the adapted membrane properties is of high relevance to increase the targetability of such drugs. Herein, natural lipids extracted from Escherichia coli -phosphatidylethanolamine (PE), phosphatidylglycerol (PG) and cardiolipin (CL)- are used to form biomimetic membranes constituted by several PE:lipid ratios using the Langmuir and Langmuir-Blodgett techniques. Read More

View Article
December 2018

Adsorption removal of refractory organic matter in bio-treated municipal solid waste landfill leachate by anion exchange resins.

Waste Manag 2018 Nov 6;81:61-70. Epub 2018 Oct 6.

School of Environment, Tsinghua University, Beijing 100084, China.

Refractory organic matters (ROM) are the dominant organic matters in the membrane bioreactor -treated MSW landfill leachate, which are usually resistant to microbial degradation. Advanced membrane systems, which are expensive and generally for drinking water treatment, have to be used to make the final effluent meet discharge requirements. Anion exchange approach might be another option to remove ROM from leachate. Read More

View Article
November 2018
1 Read

Degradation kinetics and mechanism of 3-Chlorobenzoic acid in anoxic water environment using graphene/TiO as photocatalyst.

Environ Technol 2018 Dec 11:1-41. Epub 2018 Dec 11.

b School of Resources Environment and Chemical Engineering, Nanchang University , Nanchang 330031 , China.

Degradation kinetics and mechanism of 3-Chlorobenzoic acid(3-CBA) in anoxic water environment using graphene/TiO (GR/TiO) as photocatalyst had been investigated. The effects of various parameters such as catalyst dosage, pH, initial concentration, catalyst reuse and dissolved oxygen(DO) on 3-CBA photocatalytic degradation kinetics were studied. The qualitative and quantitative analysis for degradation intermediate products and parent compound were studied by using HPLC, HPLC/MS/MS and IC technologies. Read More

View Article
December 2018

Green synthesis of magnetic 3D bio-adsorbent by corn straw core and chitosan for methylene blue removal.

Environ Technol 2018 Dec 11:1-60. Epub 2018 Dec 11.

a School of Materials Science and Engineering , University of Jinan , Jinan 250022 , People's Republic of China.

In this work, a novel bio-adsorbent with a unique structure was prepared through one-step crosslinking in the emulsion using corn straw core (CSC), CoFeO and chitosan (CS) as raw materials for adsorption of methylene blue (MB). The preparation method of the adsorbent was simple and environmentally friendly. In the adsorbent, the agricultural waste of CSC acted as scaffold and was wrapped with CS. Read More

View Article
December 2018

Micro-bubbles as heterogeneous nucleation sites for crystallization in continuous microfluidic devices.

Langmuir 2018 Dec 10. Epub 2018 Dec 10.

Injecting a stream of micro-bubbles and thereby introducing a heterogeneous interface is proposed for enhancing nucleation and controlling particle formation in continuous microfluidic devices. Different gas and liquid flow rates were investigated to establish the two-phase flow regime map and to identify the optimum characteristics for micro-bubble flow. Subsequently, the effect of micro-bubbles was studied for the cooling crystallization of paracetamol. Read More

View Article
December 2018