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PubMed Journals Articles About "Situ Probing Electrified Interfacial Water Structures Atomically Flat" RSS

10:21 EDT 17th September 2019 | BioPortfolio

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Showing "situ probing electrified interfacial water structures atomically flat" PubMed Articles 1–25 of 16,000+

Dual Functions of TEMPO-Oxidized Cellulose Nanofibers in Oil-in-Water Emulsions: a Pickering Emulsifier and a Unique Dispersion Stabilizer.

The emulsifying and dispersing mechanisms of oil-in-water emulsions stabilized by 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO)-oxidized cellulose nanofibers (CNFs) have been investigated. The emulsifying mechanism was studied by changing the oil/water interfacial tension from 8.5 to 53.3 mN/m using various types of oils. The results showed that the higher the oil/water interfacial tension, the greater the amount of CNFs adsorbed at the oil/water interface, making the CNF-adsorbed oil-in-water emulsions therm...


Micro-/Macroscopically Synergetic Control of Switchable 2D/3D Photothermal Water Purification Enabled by Robust, Portable and Cost-effective Cellulose Papers.

Solar energy, as a renewable and sustainable resource, is considered to be a promising candidate for solving the water shortage through an interfacial solar-to-thermal conversion. Despite tremendous advances are achieved, it is still challenging for limited size, high-cost and complicated fabrication protocols. More importantly, a favorable 2D/3D structure transformation to adapt to diverse conditions is considered to be very important. Inspired by the transformers with changeable geometries, herein, a larg...

Tailoring of Interfacial Band Offsets by an Atomically Thin Polar Insulating Layer to Enhance the Water-Splitting Performance of Oxide Heterojunction Photoanodes.

An important factor in the performance of photoelectrochemical water splitting is the band edge alignment of the photoelectrodes for efficient transport and transfer of photogenerated carriers. Many studies for improving charge transfer ability between the electrode and the electrolyte have been reported, while research to improve charge transfer at the hetero interface of the photoactive semiconductor and the conducting substrate is relatively lacking. Here, we demonstrate that the water-splitting performa...


FTIR analysis of β-lactoglobulin at the oil/water-interface.

Knowledge about the critical interfacial concentration of a protein supports our understanding of the kinetic stability of an emulsion. Its determination is currently limited to either invasive or indirect methods. The aim of our study was the determination of the critical interfacial concentration of whey protein β-lactoglobulin at oil/water-interfaces through fluorescence and pendant drop analysis and the comparison to an in situ Fourier-transform-infrared-spectroscopy (FTIR) method. Exponentially decre...

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy.

As a second-order nonlinear optical spectroscopy, sum frequency generation (SFG) vibrational spectroscopy has widely been used in investigating various surfaces and interfaces. This non-invasive optical technique can provide the local molecular-level information with monolayer or submonolayer sensitivity. We here are providing experimental methodology on how to selectively detect the buried interface for both macromolecules and biomacromolecules. With this in mind, interfacial secondary structures of silk f...

Direct Quantification of Water Surface Charge by Phase-Sensitive Second Harmonic Spectroscopy.

We develop and verify a phase-sensitive second harmonic generation spectroscopic scheme that allows for direct determination of the absolute surface charge density and surface potential of a water interface without need of prior interfacial information. The method relies on selective probing of surface-field-induced reorientation order of water molecules in the electrical double layer and is, hence, independent of the interfacial molecular bonding structure. Application of this technique to a mixed surfacta...

Coupling of Surface Chemistry and Electric Double Layer at TiO Electrochemical Interfaces.

Surfaces of metal oxides at working conditions are usually electrified due to the acid-base chemistry. The charged interface compensated with counterions forms the so-called electric double layer. The coupling of surface chemistry and electric double layer is considered to be crucial but poorly understood because of lacking the information at the atomistic scale. Here, we used the latest development in density functional theory based finite-field molecular dynamics simulation to investigate pH-dependence of...

Flat Boron: A New Cousin of Graphene.

The mechanical exfoliation of graphene from graphite provides the cornerstone for the synthesis of other 2D materials with layered bulk structures, such as hexagonal boron nitride, transition metal dichalcogenides, black phosphorus, and so on. However, the experimental production of 2D flat boron is challenging because bulk boron has very complex spatial structures and a rich variety of chemical properties. Therefore, the realization of 2D flat boron marks a milestone for the synthesis of 2D materials witho...

Influence of hydrophilic silica nanoparticles on the adsorption layer properties of non-ionic surfactants at water/heptane interface.

There is a notable paucity of studies investigating the impact of charged nanoparticles on the interfacial behavior of nonionic surfactants, assuming that the interactions are negligible in the absence of electrostatic forces. Here, we argue about our observations and the existence of a complex interfacial behavior in such systems depending on the type and chemical structure of surfactant. This study set out to investigate the effects of interactions between hydrophilic silica nanoparticles (NP) and non-ion...

Assembly of peptides in mica-graphene nanocapillaries controlled by confined water.

Water in nanoscale-confined geometries has unique physicochemical properties in contrast to bulk water, and is believed to play important roles in biological processes although there is less direct information available in the literature. Here, we report the self-assembly behaviors of a neurodegenerative disease related peptide termed GAV-9 encapsulated in mica-graphene nanocapillaries interacting with water nanofilms condensed under ambient conditions, based on atomic force microscopy (AFM) imaging and mol...

Electrolytes Change the Interfacial Water Structure but not the Vibrational Dynamics.

Heterogeneous ozone chemistry occurring on aerosols is driven by interfacial chem- istry and thus affected by the surface state of aerosol particles. Therefore, the effect of electrolytes on the structure of interfacial water has been under intensive investi- gation. However, consequences for energy dissipation rates and mechanisms at the interface are largely unknown. Here, we use time-resolved sum frequency generation spectroscopy to reveal that the relaxation pathway is the same for neat water-air as for...

Foaming properties and air-water interfacial behavior of corn protein hydrolyzate-tannic acid complexes.

The complexation of corn protein hydrolyzate (CPH) with tannic acid (TA) was utilized to improve the foaming properties of CPH itself, and the air-water interfacial behavior of CPH-TA complex was also investigated. The results showed that the surface hydrophobicity of pure CPH was significantly decreased in bulk solution after the complexation with TA. Compared with pure CPH, the foams stabilized by CPH-TA complex showed higher interfacial thickness between the bubbles, which well explained the better long ...

Polyatomic Iodine Species at the Air-Water Interface and Its Relevance to Atmospheric Iodine Chemistry: An HD-VSFG and Raman-MCR Study.

Iodine plays a key role in tropospheric ozone destruction, atmospheric new particle formation as well as growth. Air-water interface happens to be an important reaction site pertaining to such phenomena. However, except iodide (I-), the behavior of other iodine species e.g. triiodide (I3-) and iodate (IO3-, the most abundant iodine species in sea water) at the aqueous interface and their effect on the interfacial water are largely unknown. Using interface-specific vibrational spectroscopy (heterodyne-detect...

Probing the Partial Activation of Water by Open-Shell Interactions, Cl(HO).

The partial chemical activation of water by reactive radicals was examined computationally for small clusters of chlorine and water, Cl^⋅ (H_2 O)_(n=1-4). Using an automated isomer-search procedure, dozens of unique, stable structures were computed. Among the resulting structural classes were intact, hydrated-chlorine isomers, as well as hydrogen-abstracted (HCl)(OH) (H_2 O)_(n-1) configurations. The latter showed increased stability as the degree of hydration increased, until n=4, where a new class of st...

Evolution of aqSOA from the air-liquid interfacial photochemistry of glyoxal and hydroxyl radicals.

The effect of photochemical reaction time on glyoxal and hydrogen peroxide at the air-liquid (a-l) interface is investigated using in situ time-of-flight secondary ion mass spectrometry (ToF-SIMS) enabled by a system for analysis at the liquid vacuum interface (SALVI) microreactor. Carboxylic acids are formed mainly by reaction with hydroxyl radicals in the initial reactions. Oligomers, cluster ions, and water clusters formed due to longer photochemistry. Our results provide direct molecular evidence that w...

Chiral Water Superstructures Around Anti-parallel β-sheets Observed by Chiral Vibrational Sum Frequency Generation Spectroscopy.

Hydration modulates every aspect of protein structure and function. However, studying water structures in hydration shells remains challenging mostly due to overwhelming background from bulk water. We used vibrational sum frequency generation (SFG) spectroscopy to characterize hydrated films of an anti-parallel β-sheet peptide (LKβ) adsorbed on glass slides. The hydrated films give chiral SFG response from water only when the peptide self-assembles into anti-parallel β-sheets. Experiments of isotopic lab...

Study on the compatible interface of bamboo fiber/polylactic acid composites by in-situ solid phase grafting.

The in-situ reactive interfacial compatibilization and properties of polylactic acid-g-bamboo fiber (PLA-g-BF)/polylactic acid (PLA) composites, produced by blending with a three-component plasticizer, glycerol/formamide/tributyl citrate, were investigated. The PLA-g-BF/PLA composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimeter (DSC), thermal gravimetric analyzer (TGA) and rotational rheometer, and the bending, tensile, and water resis...

Probing Electric Double Layer Composition via in-Situ Vibrational Spectroscopy and Molecular Simulations.

At the electrode surface, ions and solvent accumulate to screen charge, leading to a nanometer-scale electric double layer (EDL). The EDL and its associated interfacial ion solvation guides electrode passivation in batteries. In EDL (super)capacitors, the EDL determines charge storage capacity. Despite its importance, quantification of the nanometer-scale and potential-dependent EDL remains a challenging problem. Here, we directly probe changes in the EDL composition with potential using in-situ vibrational...

Effect of TiO₂ on Altering Direction of Interfacial Charge Transfer in a TiO₂-Ag-MPY-FePc System by SERS.

Interfacial charge transfer (CT) is of particular interest owing to its crucial effect on the performance of molecular photovoltaic (PV) devices. The characteristics and structures of interfacial materials, such as TiO₂ nanoparticles (NPs) in some solar cells, are the key factors employed to adjust the CT process. In this study, we compare three kinds of interfacial systems, including a solar cell-like TiO₂-Ag-MPY-FePc system, to investigate the interfacial CT process using surface-enhanced Raman scatte...

Targeting antioxidants to interfaces: control of the oxidative stability of lipid-based emulsions.

The oxidation of lipid-based emulsions and nanoemulsions strongly affects their overall quality and safety. Moreover, introduction of oxidative unstable emulsions into biological systems either as energy source in parenteral nutrition or as delivery systems of bioactives, may promote oxidation "in situ" leading to the overproduction of reactive oxygen species, initiating new harmful oxidative reactions, increasing the oxidative damage. Addition of antioxidants, AOs, may help to prevent the oxidative degrada...

Cascading Interfaces Enable N-Si Photoanode for Efficient and Stable Solar Water Oxidation.

The interfaces with multi-functions for the promoted solid/solid interfacial charge transfer dynamics and the accelerated solid/electrolyte interfacial water redox reaction kinetics are determinative to the photoelectrodes achieving high performances for photoelectrochemical (PEC) water splitting. In this work, the well-designed cascading interfaces are introduced in the n-Si photoanode, which is effectively protected by an atomic layer deposited CoOx thin layer for stabilizing the n-Si photoanode and then ...

Water-in-oil Pickering emulsions stabilized by an interfacial complex of water-insoluble polyphenol crystals and protein.

Long term stabilization of water-in-oil (W/O) emulsions remains a particularly challenging problem in colloid science. Recent studies have shown that polyphenols act as Pickering stabilizers at the water-oil interface. In this work we propose a novel way to stabilize water droplets via interfacial complex formation. It was observed that polyphenol crystals (curcumin or quercetin) absorb at the interface and provide stabilization of water droplets for several days; however formation of a polyphenol- whey pro...

Variations in macro and micro physicochemical properties of activated sludge under a moderate oxidation-in situ coagulation conditioning: Relationship between molecular structure and dewaterability.

A moderate Mn(Ⅶ) oxidation-in situ Fe(Ⅲ) coagulation (Mn(Ⅶ)-Fe(Ⅱ)) conditioning strategy was proposed to improve sludge filterability and release the water bound in extracellular polymeric substances (EPS). During Mn(Ⅶ)-Fe(Ⅱ) conditioning, flocs disintegration and cell disruption, macro and micro physicochemical properties of activated sludge, especially of EPS, were investigated. Relationships between protein molecular structures in EPS fractions of three layers and sludge dewaterability were a...

Interfacial behavior and interaction mechanism of pentol/water interface stabilized with asphaltenes.

Emulsions stabilized with asphaltenes are undesirable in oil production due to the challenges associated with fouling, corrosion and environment contaminations. To understand the stabilization mechanism, the interfacial behavior and interaction mechanism of pentol/water interface in the presence of asphaltenes were investigated by interfacial tension (IFT) and atomic force microscopy (AFM) force measurements. The measured IFT increases as NaCl concentration increases from 0 to 3 M, and decreases as asphal...

Interface-Sensitive Raman Microspectroscopy of Water via Confinement with a Multimodal Miniature Surface Forces Apparatus.

Modern interfacial science is increasingly multi-disciplinary. Unique insight into interfacial interactions requires new multimodal techniques for interrogating surfaces with simultaneous complementary physical and chemical measurements. Here, we describe the design and testing of a microscope that incorporates a miniature Surface Forces Apparatus (μSFA) in sphere vs. flat geometry for force-distance measurements, while simultaneously acquiring Raman spectra of the confined zone. The simple optical setup i...


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