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PubMed Journal Database | Langmuir : the ACS journal of surfaces and colloids RSS

11:01 EST 28th January 2020 | BioPortfolio

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Showing PubMed Articles 1–25 of 2,000+ from Langmuir : the ACS journal of surfaces and colloids

Moses Effect: Splitting a sessile droplet using vapour mediated Marangoni effect leading to designer surface patterns.

In this work, we showcase a mechanism of rapid and focussed solvent depletion using vapor mediated interaction that can non-intrusively cleave a sessile water droplet reminiscent of Moses parting the Red sea. Marangoni effect is induced by the differential adsorption of vapour from a nearby pendant droplet of ethanol leading to an exponential increase in surface velocity inside the water droplet. The Marangoni convection leads to drainage of liquid from central section of the water droplet and consequently ...

Revealing Molecular-Level Interaction between a Polymeric Drug and Model Membrane via SFG and Microfluidics.

Body fluids flow all over the body and affect the biological processes at bio-interfaces. To simulate such a case, sum frequency generation (SFG) vibrational spectroscopy and a self-designed microfluidic chip were combined together to investigate the interaction between a pH-responsive polymeric drug, poly(α-propylacrylic acid) (PPAAc) and the model cell membranes in different liquid environments. By examining the SFG spectra under the static and flowing conditions, the drug-membrane interaction was reveal...

Bilayer Heterostructure Photonic Crystal Composed of Hollow Silica and Silica Spheres Arrays for Information Encryption.

Utilizing photonic crystals to fabricate information encryption materials has attracted widespread interest due to their tunable optical properties and responsiveness to external stimuli. In most of the previously reported systems, the information is hidden at a specific angle and the angle-dependent invisibility is a limitation. Meanwhile, poor structural stability is still a key issue that needs to be solved for potential applications. In this paper, a bilayer heterostructure photonic crystal containing o...

Reversible Covalent Assembly of Nanoparticles Through On-Surface Diels-Alder Reaction.

We demonstrate here a controlled assembly of individual nanoscale building blocks into defined architectures based on chemospecific covalent bonding interactions. For this purpose, Fe2O3, -Fe2O3 and SiO2 nanoparticles decorated with surface-conjugated organic ligands were used for performing on surface Diels-Alder reactions. Driven through their chemical affinity and surface-grafted complementary functionalities, nanoparticles underwent click-reactions to produce covalently organized nanostructures...

Polyglycidol-Stabilized Nanoparticles as a Promising Alternative to Nanoparticle PEGylation: Polymer Synthesis and Protein Fouling Considerations.

We herein demonstrate the outstanding protein-repelling characteristic of star-like micelles and polymersomes manufactured from amphiphilic block copolymers made by poly(butylene oxide) (PBO) hydrophobic segments and polyglycidol (PGL) hydrophilic outer shells. Although positively charged proteins (herein modeled by lysozyme) may adsorb onto the surface of micelles and polymersomes where the assemblies are stabilized by short PGL chains (degree of polymerization smaller than 15), the protein adsorption vani...

Magnetic-Alignment of Polymer Nanodiscs Probed by Solid-State NMR Spectroscopy.

The ability of amphipathic polymers to self-assemble with lipids and form nanodiscs has been a boon for the field of functional reconstitution of membrane proteins. In a field dominated by detergent micelles, a unique feature of polymer nanodiscs is their much-desired ability to align in the presence of an external magnetic field. Magnetic alignment facilitates the application of solid-state NMR spectroscopy and aids in the measurement of residual dipolar couplings (RDCs) via well established solution NMR s...

A Rapid and Tunable Method to Fabricate Angle-Independent and Transferable Structurally Colored Films.

The assembly of monodisperse particles into colloidal arrays that diffract visible light through constructive interference is of considerable interest due to their resilience against color fading. In particular, non-iridescent structurally colored materials are promising as a means of coloration for paints, inks, cosmetics, and displays because their color is angle-independent. A rapid and tunable assembly method for producing non-iridescent structurally colored colloidal-based materials that are pliable af...

Microwave processing controls morphology of block copolymer templated mesoporous cobalt oxide films.

Microwave heating provides an efficient method to rapidly heat materials through interaction of microwaves with the media. Here we demonstrate the rapid synthesis of mesopores cobalt oxide films through the heating of the silicon substrate by microwaves. A non-sol gel approach based on cobalt nitrate-citric acid complex cooperative assembly with poly[methoxy poly(ethylene glycol)methacrylate]-block-poly(butyl acrylate) (PMPEGMA-b-PBA) block copolymer was used to fabricate the cobalt oxide through a cobalt c...

Probing the hydrogen bond involving Acridone trapped in a hydrophobic biological nanocavity: Integrated spectroscopic and docking analyses.

Spectroscopic analysis reveal that Acridone (AD) penetrates through the structure and enters the hydrophobic cavity of β-Lactoglobulin (βLG), a protein containing two tryptophan (Trp) residues, and interacts with only with Trp residue (Trp 19). Interaction of AD with only one Trp is confirmed from the presence of a single isoemissive point in TRANES. Alteration in the secondary structure of the protein while AD pierces through βLG is evident from circular dichroism spectroscopic study. Ground state inter...

Leaflet-dependent distribution of PtdIns4,5P in supported model membranes.

Supported planar lipid bilayers (SLBs) prepared by spreading of unilamellar vesicles on hydrophilic substrates such as silicon dioxide are frequently used to investigate lipid-protein interactions by means of surface sensitive methods. In recent years, the receptor lipid PtdIns[4,5]P became particularly important as a significant number of proteins bind to this lipid at the inner leaflet of the plasma membrane. Here, we investigated how the lipid PtdIns[4,5]P distributes between the two leaflets of an SLB o...

Enhancing Peroxidase Activity of Cytochrome c by Modulating Interfacial Interaction Forces with Graphene Oxide.

Graphene oxide (GO) has drawn worldwide attention in various biomedical fields due to its unique properties, and great progress has been made in the past years. Probing the interaction between GO and proteins, understanding and evaluating potential impact of GO on protein structure and function, is of significant importance for design and optimization of functional interfaces and revealing the bio-effect of GO materials. Cytochromec c (cyt c), one of the key components of respiratory chain, has played impor...

PLATINUM NANOPARTICLES OBTAINED AT MILD CONDITIONS ON S-LAYER PROTEIN/POLYMER PARTICLE SUPPORTS.

This work presents the synthesis of platinum nanoparticles supported on S-layer protein/polymeric particle systems, obtained by combining proteins isolated from and an aqueous dispersion of acrylic particles. FTIR spectra of the protein/polymer supports did not show changes in the Amide I band of the proteins, suggesting that proteins maintained their conformation after adsorption. The SAXS spectra and DLS results are consistent with the formation of a protein corona around the polymer particles. After the...

Bioinspired Smart Liquid Directional Transport Control.

Developments in bioinspired superwetting materials have triggered technological revolutions in many disciplines. One representative area is liquid directional transport dominated by interface properties, which has experienced rapid progress recently. To improve the controllability, scientists try to use the external field, such as light, electricity, thermal, and so on, to assist or achieve controllable smart, responsive liquid directional transport. However, there are still some intractable problems and ch...

Confinement and cross-linking of 1,2-polybutadiene in 2D at the air-water interface.

Langmuir monolayers of 1,2-polybutadiene (PB) were investigated by coupling thermodynamical measurements, Brewster Angle Microscopy (BAM) observations and Sum-Frequency Generation (SFG) spectroscopy. A homogeneous and stable monolayer is formed 1.5 hours after PB spreading provided that both light and oxygen are present. This was attributed to a slight oxidation of the PB at the air-water interface. The cross-linking of PB under UV photoirradiation was then studied. SFG spectroscopy demonstrates the in-situ...

Yttrium Oxide as a Strongly Adsorbing but Non-quenching Surface for DNA Oligonucleotides.

A large number of nanomaterials can strongly adsorb DNA and quench fluorescence, such as graphene oxide, gold nanoparticles and most metal oxides. On the other hand, non-cationic nanomaterials that adsorb DNA but cannot quench fluorescence are less known. These materials are attractive for studying the mechanism of DNA-based surface reactions. Y2O3 was found to have this property. Herein, we used fluorescently labeled oligonucleotides as probes to study the mechanism of DNA adsorption. The fluorescence was ...

A Comparative Study on Factors Governing Binding Mechanisms in Polylactic Acid-Hydroxyapatite and Polyethylene-Hydroxyapatite Systems via Molecular Dynamics Simulations.

Binding mechanisms in (poly)lactic acid-hydroxyapatite (PLA-HAp) and (poly)ethylene-hydroxyapatite (PE-HAp) systems are comparatively elucidated on HAp (110) surfaces in unprecedented detail using molecular dynamics simulations conducted with systematically varying number of monomers (N) between 10 and 400 at 310 K (NVT). Although PE seems to gradually cover HAp surface more effectively compared to PLA, evident from the corresponding radius of gyration and occupied area values, the interface density and tot...

Microfluidic Synthesis of Carbon Nanotube-Networked Solid-Shelled Bubbles.

Carbon nanotubes (CNTs) have attracted considerable attention due to their high electrical conductivity and outstanding mechanical properties. As such, there have been numerous attempts to form CNTs into diverse structures for use in a wide range of applications. However, the intrinsic high aspect ratios of CNTs and resulting deformability have prevented the fabrication of sophisticated CNT-based structures, especially for three-dimensional (3D) cellular architectures. To challenge this limitation, we prese...

Effect of octadecylamine surfactant on DNA interactions with graphene surfaces.

Understanding of how to integrate DNA molecules with graphene materials is important for the development of bio-sensors and biomolecular logic circuits. For some of these applications, controlling DNA structural conformation on the graphene substrate is critically important and can be achieved through the use of self-assembled monolayers. Here, we performed all-atom molecular dynamics simulations to understand how various 1-octadecylamine (ODA) coatings of graphene surface affect the conformation of double-...

Thermoresponsivity, Micelle Structure and Thermal-Induced Structural Transition of Amphiphilic Block Copolymer Tuned by Terminal Multiple H-Bonding Units.

Constructing noncovalent interactions has been a benign method to tune the stimuli responsivity and assembled structure of polymers in solution; this is essential for controlling the functions and properties of stimuli-responsive materials. Herein, we demonstrate a novel supramolecular strategy to manipulate the cloud point (Tcp) and assembled structure of thermoresponsive polymers in solution by using H-bonding interactions. We use poly(lactide-co-glycolide)-b-poly(ethylene glycol)-b- poly(lactide-co-glyco...

pH-RESPONSIVE COPOLYMER FILMS PREPARED BY SURFACE-INITIATED POLYMERIZATION AND SIMPLE MODIFICATION.

We report the preparation of pH-responsive, ester/carboxylic acid random copolymer films via simple modification of poly(norbornene diacyl chloride) (pNBDAC), prepared via surface-initiated ring-opening metathesis polymerization, with mixtures of water and ethanol to form carboxylic acid and ethyl ester side groups. The pNBDAC film serves as a compositionally versatile platform to controllably obtain copolymers with multiple functionalities. In modifying the pNBDAC to form the copolymer film, ethanol exhibi...

Nanoscale induced formation of silicide around gold nanoparticles encapsulated in a-Si.

Decorating thin film solar cells with plasmonic nanoparticles is being pursued, in order to improve device efficiency through increased scattering and local field enhancement. Gold nanoparticles are in particular interesting, due to their chemical inertness and plasmon resonance in the visible range of the spectrum. In this work, gold nanoparticles fabricated by a gas aggregation nanoparticle source and embedded in a-Si (a commercial solar cell material) are studied using x-ray photo-electron spectroscopy, ...

A Simple Model for Diffusion Limited Drop Evaporation of Binary Liquids from Physical Properties of the Components: Ethanol-Water Example.

The understanding of the evaporation process of drops consisting of binary mixtures, in particular ethanol-water drops is important in many industries such as ink jet printing, cooling of microelectronics and alcohol added pesticide spray applications. The theory of the diffusion-limited drop evaporation process for pure liquids has been investigated thoroughly and linear (dV(2/3)/dt) slopes were obtained for most of the cases. However, the evaporation of binary liquid drops was found to be much more compli...

Magnetic Organic-Inorganic Nanohybrid for Efficient Modification of Paraffin Hydrocarbon Crystallization in Model Oil.

Crystallization modification has been applied in many fields, such as materials science, petroleum engineering, and chemical engineering. The modification of organic-inorganic hybrids via paraffin hydrocarbon crystallization has been significantly important for the exploration of undersea oil and gas resources. In this work, a metal oxide organic-inorganic hybrid pour point depressant (MOIH-PPD) is provided along with an analysis of the microscopic structure of the paraffin hydrocarbon crystal employing sma...

Hydrogel Matrix Grafted Impedimetric Aptasensor for the Detection of Diclofenac.

Driven by the growing concern about the release of the untreated emerging pollutants and the need for determining small amount of these pollutants present in the environment, novel biosensors dedicated to molecular recognition are developed. We have designed biosensors using a novel class of grafted polymers, surface-attached hydrogel thin films on conductive transducer as a biocompatible matrix for biomolecule immobilization. We showed that they can be dedicated to the molecular recognition of Diclofenac (...

Modulating The Electronic Properties of Au-MoS Interfaces Using Functionalized Self-Assembled Monolayers.

Molybdenum disulfide (MoS) is one of the most widely investigated transition metal dichalcogenides with applications in electronic devices and sensors. A critical issue in the development of these devices is the high contact resistance between the metal electrode and the molybdenum disulfide layer. In this study we employ Raman spectroscopy and x-ray photoelectron spectroscopy to investigate the modification of Au-MoS contact properties using functionalized alkanethiolate self-assembled monolayers (SAMs). W...


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