3,741 results match your criteria measured langmuir

Cadmium transport in red paddy soils amended with wheat straw biochar.

Environ Monit Assess 2021 Jun 3;193(7):381. Epub 2021 Jun 3.

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.

Cadmium (Cd) can be leached from soil into the groundwater and exhibit its adverse effect on the health of animals and humans. While previous studies have studied the process of Cd transport in water-saturated sand columns, literature regarding Cd transport in soil is scarce. The aim of this experiment was to investigate the transport of Cd in soil columns and biochar application rate effects on the mobility and distribution of Cd in soil. Read More

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Salt-Responsive Pickering Emulsions Stabilized by Functionalized Cellulose Nanofibrils.

Langmuir 2021 Jun 3. Epub 2021 Jun 3.

Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom.

Oil-in-water emulsions have been stabilized by functionalized cellulose nanofibrils bearing either a negative (oxidized cellulose nanofibrils, OCNF) or a positive (cationic cellulose nanofibrils, CCNF) surface charge. The size of the droplets was measured by laser diffraction, while the structure of the shell of the Pickering emulsion droplets was probed using small-angle neutron scattering (SANS), confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM), and rheology measurements. Both OCNF- and CCNF-stabilized emulsions present a very thick shell (>100 nm) comprised of densely packed CNF. Read More

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Theoretical Derivation of a Prediction Model for CO Adsorption by Coal.

ACS Omega 2021 May 17;6(20):13275-13283. Epub 2021 May 17.

College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China.

Adsorption characteristics of CO by coal are an important reservoir parameter to determine the CO storage capacity of the coal seam. The Langmuir isotherm adsorption model is commonly used to describe the isothermal adsorption line of coal. However, we cannot predict the CO adsorption capacity at other temperatures by using the Langmuir model based on the experimental data at a fixed temperature. Read More

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Diltiazem-imprinted porphyrinic covalent organic frameworks as solid-phase extractants and fluorescent sensors.

Anal Chim Acta 2021 Jul 6;1168:338608. Epub 2021 May 6.

School of Pharmacy, China Medical University, No. 91 Hsueh-Shih Road, Taichung, 40402, Taiwan.

Diltiazem, which is a calcium channel blocker, is involved in the formation of covalent organic frameworks (COFs) through the Schiff base reaction of tetrakis (4-aminophenyl)-porphine (TAPP) and dihydroxynaphthalene-dicarbaldehyde (DHNDC) and the next enol-to-keto tautomerization. The diltiazem-imprinted COFs (DICOFs) were optimally formed using Sc(OTf) as the catalyst, TAPP/DHNDC/diltiazem in a molar ratio of 2/3/4, N-methylpyrrolidone/mesitylene (v/v = 3/5) as the porogen, and a 1-h reaction with a high imprinting factor of 10.5 compared to the nonimprinted counterparts (NICOFs). Read More

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Atomic Force Microscopy Study of Non-DLVO Interactions between Drops and Bubbles.

Langmuir 2021 Jun 27;37(22):6830-6837. Epub 2021 May 27.

Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China.

The heterointeraction between liquid drops and air bubbles dispersed in another immiscible liquid is studied with the application of the atomic force microscopy (AFM) probe techniques. The tetradecane drops and air bubbles readily coalescence to form a lens-like structure in 100 mM sodium chloride aqueous solution, demonstrating strong hydrophobic (HB) attraction. The interaction range and strength of this hydrophobic attraction between oil drops and air bubbles is investigated by fine control of electrical double layer thicknesses related to specific electrolyte concentrations, and a midrange term in combination with a short-range term is found to present a proper characterization of this hydrophobic attraction. Read More

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Evaluating Superhydrophobic Surfaces under External Pressures using Quartz Crystal Microbalance.

Langmuir 2021 Jun 26;37(22):6650-6659. Epub 2021 May 26.

Department of Mechanical and Industrial Engineering Northeastern University, Boston, Massachusetts 02115, United States.

The performance of hydrophobic surfaces under hydraulic pressures is critical to a wide range of practical applications such as drag reduction of seaboard vessels and design of microfluidic devices. This research focuses on the evaluation of drag reduction and velocity slip of hydrophobic surfaces and coatings under external hydrostatic pressures using an acoustic wave device (i.e. Read More

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Mechanistic Insights into Interactions at Urea-Hydroxyapatite Nanoparticle Interface.

Langmuir 2021 Jun 21;37(22):6691-6701. Epub 2021 May 21.

Department of Physics, University of Colombo, Colombo 00300, Sri Lanka.

Development of controlled release biomolecules by surface modification of hydroxyapatite nanoparticles has recently gained popularity in the areas of bionanotechnology and nanomedicine. However, optimization of these biomolecules for applications such as drug delivery, nutrient delivery requires a systematic understanding of binding mechanisms and interfacial kinetics at the molecular level between the nanomatrix and the active compound. In this research, urea is used as a model molecule to investigate its interactions with two morphologically different thin films of hydroxyapatite nanoparticles. Read More

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Bimodal AFM-Based Nanocharacterization of Cycling-Induced Topographic and Mechanical Evolutions of LiMnO Cathode Films.

Langmuir 2021 Jun 17;37(21):6406-6413. Epub 2021 May 17.

School of Physics, Beihang University, Beijing 100191, People's Republic of China.

Evolution of LiMnO mechanical property during charge/discharge cycles is a critical issue because it is closely related to the performance of lithium-ion batteries. Extensive studies have been conducted by first-principles calculations/molecular dynamics simulation at the atomic level and by the nanoindentation technique at the micron scale. In this study, cycling-induced topographic and mechanical evolutions of the LiMnO films are investigated at the nanoscale using the bimodal atomic force microscopy (AFM), which provides a complementary approach to bridge the gap between atomic-level calculation and micron-scale measurement. Read More

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Preparation of mesoporous batatas biochar via soft-template method for high efficiency removal of tetracycline.

Sci Total Environ 2021 Sep 29;787:147397. Epub 2021 Apr 29.

School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; Henan Key Laboratory of Water Environment Simulation and Treatment, North China University of Water Resources and Electric Power, Zhengzhou 450046, China. Electronic address:

In this contribution, we apply a soft-template-assisted hydrothermal route using polyethylene-polypropylene glycol (F127) as soft-template agent and biomass batatas as carbon precursor to synthesis a novel hydrothermal mesoporous biochar (HMC-800) for adsorptive removal of tetracycline (TC) from wastewater. We use the biochar prepared without F127 and direct pyrolytic biochar for comparison. The physicochemical properties of all the studied biochar samples are measured using a suite of characterization techniques. Read More

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September 2021

Droplet Mobility on Slippery Lubricant Impregnated and Superhydrophobic Surfaces under the Effect of Air Shear Flow.

Langmuir 2021 May 12;37(20):6278-6291. Epub 2021 May 12.

Department of Mechanical, Industrial, and Aerospace Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada.

The focus of this study is to investigate and compare the behavior of a droplet on superhydrophobic (SHS) and slippery lubricant impregnated (SLIPS) surfaces under the effect of air shear flow. In this regard, both experimental and numerical analyses have been conducted to compare their performance on droplet mobility under different air speeds. Two different lubricants have been utilized to scrutinize their effect on droplet movement. Read More

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Visualization of Acoustic Energy Absorption in Confined Aqueous Solutions by PNIPAM Microgels: Effects of Bulk Viscosity.

Langmuir 2021 May 7;37(19):5854-5863. Epub 2021 May 7.

Department of Physics, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany.

Ultrasound propagation in liquids is highly influenced by its attenuation due to viscous damping. The dissipated energy will be partially absorbed by the liquid due to its dynamic viscosity as well as its bulk viscosity. The former results in the generation of a flow that is called acoustic streaming, and the latter is associated with the vibrational and rotational relaxation of liquid molecules. Read More

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Fabrication of Robust Capsules by Sequential Assembly of Polyelectrolytes onto Charged Liposomes.

Langmuir 2021 05 4;37(20):6189-6200. Epub 2021 May 4.

Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, Madrid 28040, Spain.

This work presents a simple methodology for coating small unilamellar liposomes bearing different degrees of positive charge with polyelectrolyte multilayers using the sequential layer-by-layer deposition method. The liposomes were made of mixtures of 1,2-dioleyl--glycero-3-phosphocoline and dimethyl dioctadecyl ammonium bromide (DODAB) and coated by alternated layers of the sodium salt of poly(4-styrenesulfonate) (PSS) and poly(allylamine) (PAH) as polyanions and polycations, respectively. The results show that the zeta potential of the liposomes was not very sensitive to the mole fraction of DODAB in the membrane, , in the range 0. Read More

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Tubulation of Supported Lipid Bilayer Membranes Induced by Photosensitized Lipid Oxidation.

Langmuir 2021 05 3;37(19):5753-5762. Epub 2021 May 3.

Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States.

We show that photosensitized phospholipid oxidation, initiated by the lipid-conjugated fluorophore TopFluor-PC, causes defects, namely, membrane tubes and vesicle-like structures, in supported lipid bilayers (SLBs). Lipid oxidation is detrimental to the integrity of the lipid molecules; when oxidized, they undergo a conformational expansion, which causes membrane tubes to protrude from the SLB. Lipid oxidation is verified by FT-IR spectroscopy, and area expansion is observed in Langmuir trough experiments. Read More

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Stability Analysis: Rational Design of a Ag Nanoparticle/Polymer Brush for Fabricating Cu Coating on a PET Surface.

Langmuir 2021 May 30;37(18):5673-5681. Epub 2021 Apr 30.

Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization, College of Materials and Chemical Engineering, Hezhou University, Hezhou 542899, China.

Excellent stability of a catalytic center would facilitate the prolongation of the cycle of a chemical plating bath and the reduction of environmental pollution. In this study, silane (3-aminopropyltriethoxysilane (KH550) and γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560)) was incorporated in AgNO solution to rationally prepare a Ag nanoparticle/polymer brush (Ag/PB) catalytic solution. The effects of the KH560 relative content on the Ag/PB structure and stability were studied. Read More

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Structuring of ZnTiO/TiO Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives.

Nanomaterials (Basel) 2021 Apr 1;11(4). Epub 2021 Apr 1.

Departamento d'Enginyería Química, Universitat Rovira i Virgili, Av Països Catalans 26, 43007 Tarragona, Spain.

Adsorption is an effective method of removing harmful pollutants from air and water. In the present study, zeolites prepared by sol-gel method from two Ecuadorian clays were combined with precursor clays and the ZnTiO/TiO semiconductor for adsorbing methylene blue (MB) as a water contaminant. The synthesized compounds were characterized using powder X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive X-ray, and surface area measurement. Read More

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A Stable NanoPAA-ZnO/ZnCl Composite with Variable 3D Structured Morphology and Sustained Superhydrophilicity.

Langmuir 2021 05 26;37(18):5457-5463. Epub 2021 Apr 26.

Joule Physics Laboratory, School of Science, Engineering and Environment, University of Salford, Salford, Greater Manchester M5 4WT, U.K.

A ZnO/ZnCl composite with stable 3D structural morphologies and long lasting superhydrophilicity was synthesized on the top surface of a nano porous anodic alumina (nanoPAA) substrate. The wettability of a nanoPAA-ZnO/ZnCl was systematically characterized and the experimental data indicated that the water contact angle (WCA) of 0° could be achieved as well as maintained over 7 days and still remained at 4.36° after 50 days, and its 3D structural morphology had no clearly observable change during this period. Read More

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Bioinspired Geometry-Gradient Metal Slippery Surface by One-Step Laser Ablation for Continuous Liquid Directional Self-Transport.

Langmuir 2021 05 25;37(17):5436-5444. Epub 2021 Apr 25.

Institute of Tribology, School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China.

Liquid directional self-transport on the functional surface plays an important role in both industrial and academic fields. Inspired by the natural cactus spine and pitcher plant, we have successfully designed a kind of geometry-gradient slippery surface (GGSS) based on aluminum alloy materials which could actively achieve directional self-movement and also antigravity self-movement of various liquid droplets by topography gradient. The mechanism of liquid directional self-transport was theoretically explored through the mechanical analysis of the triple contact line, which was mainly related to the competition between the driven force induced by Laplace pressure and the adhesive force induced by viscous resistance. Read More

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Ionic-strength and pH dependent reactivities of ascorbic acid toward ozone in aqueous micro-droplets studied using aerosol optical tweezers.

Phys Chem Chem Phys 2021 Apr;23(16):10108-10117

Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.

The heterogeneous oxidation reaction of single aqueous ascorbic acid (AH2) aerosol particles with gas-phase ozone was investigated in this study utilizing aerosol optical tweezers with Raman spectroscopy. The measured liquid-phase bimolecular rate coefficients of the AH2 + O3 reaction exhibit a significant pH dependence, and the corresponding values at ionic strength 0.2 M are (3. Read More

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Stealthiness and Hematocompatibility of Gold Nanoparticles with Pre-Formed Protein Corona.

Langmuir 2021 04 16;37(16):4913-4923. Epub 2021 Apr 16.

Department of Biomedical Engineering, National University of Singapore, 4 Engineering Drive 3, Block E4, #04-08, 117583 Singapore.

Studies have established that a serum protein corona pre-formed around gold nanorods (NRs) could be exploited for loading photosensitizers and chemotherapeutics to result in efficient cell kill with an extremely low dose. In this study, we further demonstrated that pre-forming a serum protein corona (PC) around citrate-capped NRs (NR-Cit) to form NR-PC conferred them stealth property and high hematocompatibility similar to the common strategy of PEGylating NRs, which would otherwise not be able to evade the immune system. Specifically, the NR-PC caused minimal complement activation with significantly lower formation of the terminal complement complex SC5b-9 measured in human serum containing NR-PC, and this resulted in low uptake by phagocytic U937 monocytes of 5. Read More

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Dilatational rheology of water-in-diesel fuel interfaces: effect of surfactant concentration and bulk-to-interface exchange.

Soft Matter 2021 May;17(18):4751-4765

Department of Mechanical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN, USA. and Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Minneapolis, MN, USA.

Micrometer-sized water droplets dispersed in diesel fuel are stabilized by the fuel's surface-active additives, such as mono-olein and poly(isobutylene)succinimide (PIBSI), making the droplets challenging for coalescing filters to separate. Dynamic material properties found from interfacial rheology are known to influence the behavior of microscale droplets in coalescing filters. In this work, we study the interfacial dilatational properties of water-in-fuel interfaces laden with mono-olein and PIBSI, with a fuel phase of clay-treated ultra-low sulphur diesel (CT ULSD). Read More

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Noncovalent Association and Partitioning of Some Perfume Components at Infinite Dilution with Myelin Basic Protein Pseudophase in Normal Saline.

Langmuir 2021 04 14;37(16):4793-4801. Epub 2021 Apr 14.

Department of Information Science and Technology, George Mason University, Fairfax, Virginia 22030, United States.

Myelin basic protein (MBP), one of the major protein constituents of the myelin sheath, possesses unique ligand-binding features. We present a novel equilibrium headspace gas chromatographic technique to examine the thermodynamics of noncovalent interactions between common perfume components: Lilial, Hedione, Hexylcinnamic aldehyde, and Versalide with MBP monomers and its hexameric MBP-pseudophase. A general theoretical model is used to calculate the critical aggregation concentration (cac) of MBP, perfume component binding constants with monomeric MBP, , and MBP as pseudophase, , and free energies for perfume component binding with monomeric MBP, Δ, and MBP as pseudophase, Δ. Read More

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Wetting Dynamics of a Lipid Monolayer.

Langmuir 2021 04 13;37(16):4879-4890. Epub 2021 Apr 13.

Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Direct measurement and control of the dynamic wetting properties of a lipid-coated water-air interface over a wide range of surface tension variations have many important applications. However, the wetting dynamics of the interface near its partial-to-complete wetting transition has not been fully understood. Here, we report a systematic study of the wetting dynamics of a lipid-coated water-air interface around a thin glass fiber of diameter 1-5 μm and length 100-300 μm. Read More

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Evaluation of Interfacial pH Using Surface Forces Apparatus Fluorescence Spectroscopy.

Langmuir 2021 Apr 13;37(16):5073-5080. Epub 2021 Apr 13.

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.

The fluorescence spectrum measurement of a fluorescence pH probe, C. SNARF-4F, was performed for monitoring the interfacial pH of aqueous electrolytes between mica or silica surfaces while varying the surface separation () using surface force apparatus (SFA) fluorescence spectroscopy. The pH of the aqueous CsCl between mica exponentially decreased with decreasing . Read More

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Interactions of an Imine Polymer with Nanoporous Silica and Carbon in Hybrid Adsorbents for Carbon Capture.

Langmuir 2021 Apr 5;37(15):4622-4631. Epub 2021 Apr 5.

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Efficient carbon capture from stationary point sources can be achieved using hybrid adsorbents comprising nanoporous substrates coated with imine polymers. The physical properties of the CO-adsorbing, nanodispersed polymers are altered by their interactions with the substrate, which in turn may impact their capture capacity. We study silica and carbon nanoporous substrates with different pore morphologies that were impregnated with polymer imine with the goal of characterizing the polymer dispersions in the pores. Read More

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A Universal Standard Archive File for Adsorption Data.

Langmuir 2021 04 2;37(14):4222-4226. Epub 2021 Apr 2.

Department of Inorganic Chemistry, Technische Universität Dresden, Bergstrasse 66, 01062 Dresden, Germany.

New advanced adsorbents are a crucial driver for the development of energy and environmental applications. Tremendous potential is provided by machine learning and data mining techniques, as these approaches can identify the most appropriate adsorbent for a particular application. However, the current scientific reporting of adsorption isotherms in graphs and figures is not adequate to reproduce original experimentally measured data. Read More

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Controlled Manipulation and Active Sorting of Particles Inside Microfluidic Chips Using Bulk Acoustic Waves and Machine Learning.

Langmuir 2021 04 2;37(14):4192-4199. Epub 2021 Apr 2.

Faculty of Medicine and Health Technology, Tampere University, Korkeakoulunkatu 3, 33720 Tampere, Finland.

Manipulation of cells, droplets, and particles via ultrasound within microfluidic chips is a rapidly growing field, with applications in cell and particle sorting, blood fractionation, droplet transport, and enrichment of rare or cancerous cells, among others. However, current methods with a single ultrasonic transducer offer limited control of the position of single particles. In this paper, we demonstrate closed-loop two-dimensional manipulation of particles inside closed-channel microfluidic chips, by controlling the frequency of a single ultrasound transducer, based on machine-vision-measured positions of the particles. Read More

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Effect of pH on the Structure and Dynamics of Wormlike Micelles in an Amino Acid-Derived Surfactant Composition.

Langmuir 2021 04 31;37(14):4112-4120. Epub 2021 Mar 31.

Beauty Care Research and Development & Corporate Functions Research and Development, The Procter & Gamble Company, Cincinnati, Ohio 45202, United States.

We studied the impact of pH as a thickening mechanism on the structure and dynamics of wormlike micelles in a mixture of sodium lauroyl sarcosinate (SLSar) and cocamidopropyl hydroxysultaine (CAHS). The viscoelastic properties were obtained using mechanical rheometry and diffusing wave spectroscopy, which provided access to a wide range of frequencies. By using a mesoscopic simulation method [Zou; Larson. Read More

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Locomotion of a Nonaqueous Liquid Marble Induced by Near-Infrared-Light Irradiation.

Langmuir 2021 Apr 31;37(14):4172-4182. Epub 2021 Mar 31.

Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.

Micrometer-sized hydrophobic polyaniline (PANI) grains were synthesized via an aqueous chemical oxidative polymerization protocol in the presence of dopant carrying perfluoroalkyl or alkyl groups. The critical surface tensions of the PANIs synthesized in the presence of heptadecafluorooctanesulfonic acid and sodium dodecyl sulfate dopants were lower than that of PANI synthesized in the absence of dopant, indicating the presence of hydrophobic dopant on the grain surfaces. The PANI grains could adsorb to air-liquid interfaces, and aqueous and nonaqueous liquid marbles (LMs) were successfully fabricated using liquids with surface tensions ranging between 72. Read More

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Unusual Maximum in the Adsorption of Aqueous Surfactant Mixtures: Neutron Reflectometry of Mixtures of Zwitterionic and Ionic Surfactants at the Silica-Aqueous Interface.

Langmuir 2021 Apr 28;37(13):3939-3949. Epub 2021 Mar 28.

Rutherford-Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K.

The adsorption of two zwitterionic surfactants, dodecyldimethylammonium propanesulfonate (CPS) and dodecyldimethylammonium carboxybetaine (CCB), and of their mixtures with the cationic dodecyltrimethylammonium bromide (CTAB) and the anionic sodium dodecylsulfate (SDS) at the silica-water interface has been studied by neutron reflection (NR). The total adsorption, the composition of the adsorbed layer, and some structural information have been obtained over a range of concentrations from below the critical micelle concentration (CMC) to about 30× the mixed CMC. The adsorption behavior has been considered in relation to the previously measured micellar equilibrium of these mixtures in their bulk solutions and their adsorption at the air-water interface. Read More

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Molecular Study of Ultrasound-Triggered Release of Fluorescein from Liposomes.

Langmuir 2021 04 26;37(13):3868-3881. Epub 2021 Mar 26.

Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale, LIB, F-75006 Paris, France.

Several investigations have suggested that ultrasound triggers the release of drugs encapsulated into liposomes at acoustic pressures low enough to avoid cavitation or high hyperthermia. However, the mechanism leading to this triggered release as well as the adequate composition of the liposome membrane remains unknown. Here, we investigate the ultrasound-triggered release of fluorescein disodium salt encapsulated into liposomes made of 1,2-dioleoyl--glycero-3-phosphocholine (DOPC) or 1,2-distearoylphosphatidyl-ethanolamine (DSPC) lipids with various concentrations of cholesterol (from 0 to 44 mol %). Read More

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