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Solid Liquid Interface

Rosa M Arán-Ais, Dunfeng Gao, Beatriz Roldan Cuenya
The utilization of fossil fuels (i.e., coal, petroleum, and natural gas) as the main energy source gives rise to serious environmental issues, including global warming caused by the continuously increasing level of atmospheric CO2 . To deal with this challenge, fossil fuels are being partially replaced by renewable energy such as solar and wind. However, such energy sources are usually intermittent and currently constitute a very low portion of the overall energy consumption. Recently, the electrochemical conversion of CO2 to chemicals and fuels with high energy density driven by electricity derived from renewable energy has been recognized as a promising strategy toward sustainable energy...
October 18, 2018: Accounts of Chemical Research
Konan Imadate, Kaori Hirahara
The wettability of individual carbon nanotubes (CNTs) with <20 nm diameter was experimentally evaluated on the basis of the Wilhelmy method via atomic force microscopy to visualize the effect of the nanometer-scale curvature of a solid surface on the solid-liquid and solid-vapor interface tensions. The experimental results showed the deviation of force owing to wetting for diameters <10 nm. In particular, for nanotubes with <4.5 nm diameter, the wettability tended to differ from its previously predicted behavior...
October 17, 2018: Physical Chemistry Chemical Physics: PCCP
Crystal Chan, Enno Kätelhön, Richard G Compton
The Brownian motion of nanoparticles near liquid-solid interfaces is at the heart of evolving technologies: recent developments in the sensing of nano-objects and energy storages based on electro-active colloidal solutions crucially rely on the understanding and, even more, on the control of particle transport near charged surfaces. On the basis of the Nernst-Planck equation, the Gouy-Chapman model, and an established model of near-wall hindered diffusion, this work predicts transient and highly-localised accumulations of nanoparticles at a well-defined distance from an electrified surface following a potential being applied...
October 15, 2018: Nanoscale
Shuanhong Ma, Changyou Yan, Meirong Cai, Jun Yang, Xiaolong Wang, Feng Zhou, Weimin Liu
The development of versatile generalized strategies for easy surface modification is of immense scientific interest. Herein, a novel mechanism to form functional hydrogel coatings on a wide variety of substrate materials including polymers, polymeric resins, ceramics, and intermetallic compounds, enabling easy change of the surface wettability and lubrication property, is reported. In situ polymerization and hydrogel coating formation is initiated by free radicals generated through the redox reaction between Fe2+ and S2 O8 2- at the solid-liquid interface, which shows controllable growth kinetics...
October 11, 2018: Advanced Materials
Emilie Bordes, Laurent Douce, Edward L Quitevis, Agílio A H Pádua, Margarida Costa Gomes
The aim of this work is to provide a better understanding of the interface between graphite and different molecular and ionic liquids. Experimental measurements of the liquid surface tension and of the graphite-liquid contact angle for sixteen ionic liquids and three molecular liquids are reported. These experimental values allowed the calculation of the solid/liquid interfacial energy that varies, for the ionic liquids studied, between 14.5 mN m-1 for 1-ethyl-3-methylimidazolium dicyanamide and 37.8 mN m-1 for 3-dodecyl-1-(naphthalen-1-yl)-1H-imidazol-3-ium tetrafluoroborate...
May 21, 2018: Journal of Chemical Physics
Florian Buchner, Benedikt Uhl, Katrin Forster-Tonigold, Joachim Bansmann, Axel Groß, R Jürgen Behm
Ionic liquids (ILs) are considered as attractive electrolyte solvents in modern battery concepts such as Li-ion batteries. Here we present a comprehensive review of the results of previous model studies on the interaction of the battery relevant IL 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP]+ [TFSI]- ) with a series of structurally and chemically well-defined model electrode surfaces, which are increasingly complex and relevant for battery applications [Ag(111), Au(111), Cu(111), pristine and lithiated highly oriented pyrolytic graphite (HOPG), and rutile TiO2 (110)]...
May 21, 2018: Journal of Chemical Physics
Chip J Smith, Sascha Gehrke, Oldamur Hollóczki, Durgesh V Wagle, Mark P Heitz, Gary A Baker
Bacterial cellulose ionogels (BCIGs) represent a new class of material comprising a significant content of entrapped ionic liquid (IL) within a porous network formed from crystalline cellulose microfibrils. BCIGs suggest unique opportunities in separations, optically active materials, solid electrolytes, and drug delivery due to the fact that they can contain as much as 99% of an IL phase by weight, coupled with an inherent flexibility, high optical transparency, and the ability to control ionogel cross-sectional shape and size...
May 21, 2018: Journal of Chemical Physics
Fritz Herbert Scholz, Antonio Doménech-Carbó
Insertion electrochemical electrodes exhibit simultaneous electron and ion transfer, where both transfers proceed across different interfaces. Here the thermodynamics of the overall electrochemical electrode reaction is discussed with respect to the thermodynamics of these two charge transfer equilibria. The review includes insertion electrochemical systems where the redox centers are in a solid phase and the ions are transferred between that phase and a solution, and also systems where the redox centers are in a liquid phase which is immiscible with another liquid phase and ions are transferred between these two liquid phases...
October 11, 2018: Angewandte Chemie
Jeeranan Nonkumwong, Uriel Joseph Erasquin, Kurt Waldo E Sy Piecco, Uvinduni I Premadasa, Ahmed M Aboelenen, Andrew A Tangonan, Jixin Chen, David C Ingram, Laongnuan Srisombat, Katherine Leslee Asetre Cimatu
Successive surface reactions on hydrophilic silica substrates were designed and performed to immobilize ethanolamine-modified magnetic ferrite-based nanoparticle (NP) for surface characterization. The various surfaces were monitored using sum-frequency generation (SFG) spectroscopy. The surface of the hydrophilic quartz substrate was first converted to a vinyl-terminated surface by utilizing a silanization reaction, and then, the surface functional groups were converted to carboxylic-terminated groups via a thiol-ene reaction...
October 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Wesley Chang, Jeung Hun Park, Daniel A Steingart
Lithium metal is an ideal material for high-energy, cost-effective rechargeable energy storage systems. The thermodynamically unfavorable solid-liquid interface between the lithium metal and organic electrolyte necessitates the formation of an interlayer (SEI) which is known to have significant impact on lithium morphologies. Less well understood is the impact of the current collector substrate on the morphology of electrodeposited lithium. Here we report on the morphology of electrodeposited lithium as a function of the chemical pretreatments of the working electrode...
October 18, 2018: Nano Letters
Shasha Jiang, Na Du, Shue Song, Wanguo Hou
A "sorbent mass variation" (SMV) method has been suggested to investigate the adsorption at solid-liquid interfaces, which can provide information on the adsorbed layer structure including its thickness and composition. However, there has been little research focused on the method, and therefore, it is essential to examine its general applicability. Herein, the adsorption of benzyldimethyldodecylammonium bromide (BDDABr), a cationic surfactant, on silica (SiO2 ) nanoparticles (with ∼12 and 24 nm in size, denoted as S-SiO2 and L-SiO2 , respectively) in water was investigated using the SMV method...
October 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Liyuan Zhang, Xinhui Xia, Yu Zhong, Dong Xie, Sufu Liu, Xiuli Wang, Jiangping Tu
The development of high-performance dendrite-free liquid-metal anodes at room temperature is of great importance for the advancement of alkali metal batteries. Herein an intriguing self-healing liquid dendrite-free Na-K alloy, fabricated by a facile room-temperature alloying process, aiming for application in potassium-ion batteries is reported. Through extensive investigation, its self-healing characteristics are rooted upon a thin solid K2 O layer (KOL) coated on the liquid Na-K alloy. The KOL not only acts as a protective layer to prevent the Na-K alloy from making contact with the electrolyte, but also greatly improves the wetting capability and adhesion between the liquid alloy and the carbon matrix (e...
October 8, 2018: Advanced Materials
Laís C Lopes, Lidya C da Silva, Boniek G Vaz, Alfredo R M Oliveira, Marcela M Oliveira, Maria L M Rocco, Elisa S Orth, Aldo J G Zarbin
The largest graphene sample obtained through a chemical reaction under ambient conditions (temperature and pressure), using simple molecules such as benzene or n -hexane as precursors, is reported. Starting from a heterogeneous reaction between solid iron chloride and the molecular precursor (benzene and n -hexane) at a water/oil interface, graphene sheets with micrometric lateral size are obtained as a film deposited at the liquid/liquid (L/L) interface. The pathway involving the cyclization and aromatization of n -hexane to benzene at the L/L interface, and the sequence of conversion of benzene to biphenyl and biphenyl to condensed rings (which originates the graphene structures) was followed by different characterization techniques and a mechanistic proposal is presented...
October 7, 2018: Chemical Science
Shikha Dixit, Narendra K Arora, Atiqur Rahman, Natasha J Howard, Rakesh K Singh, Mayur Vaswani, Manoja K Das, Faruqueuddin Ahmed, Prashant Mathur, Nikhil Tandon, Rajib Dasgupta, Sanjay Chaturvedi, Jaishri Jethwaney, Suresh Dalpath, Rajendra Prashad, Rakesh Kumar, Rakesh Gupta, Laurette Dube, Mark Daniel
BACKGROUND: Inadequate administrative health data, suboptimal public health infrastructure, rapid and unplanned urbanization, environmental degradation, and poor penetration of information technology make the tracking of health and well-being of populations and their social determinants in the developing countries challenging. Technology-integrated comprehensive surveillance platforms have the potential to overcome these gaps. OBJECTIVE: This paper provides methodological insights into establishing a geographic information system (GIS)-integrated, comprehensive surveillance platform in rural North India, a resource-constrained setting...
October 5, 2018: JMIR Public Health and Surveillance
Lei Wang, Ran Liu, Jiali Gu, Bo Song, Heng Wang, Xin Jiang, Keren Zhang, Xin Han, Xin-Qi Hao, Shi Bai, Ming Wang, Xiaohong Li, Bingqian Xu, Xiaopeng Li
In the seeking of molecular expression of fractal geometry, chemists have endeavored in the construction of molecules and supramolecules during the past few years, while only a few examples were reported, especially for the discrete architectures. We herein designed and constructed five generations of supramolecular fractals (G1-G5) based on the coordination-driven self-assembly of terpyridine ligands. All the ligands were synthesized from triphenylamine motif, which played a central role in geometry control...
October 5, 2018: Journal of the American Chemical Society
Jo Sing Julia Tang, Romina Sigrid Bader, Eric S A Goerlitzer, Jan Fedja Wendisch, Gilles Remi Bourret, Marcel Rey, Nicolas Vogel
Colloidal lithography is a cost-efficient method to produce large-scale nanostructured arrays on surfaces. Typically, colloidal particles are assembled into hexagonal close-packed monolayers at liquid interfaces and deposited onto a solid substrate. Many applications, however, require non close-packed monolayers, which are more difficult to fabricate. Preassembly at the oil/water interface provides non close-packed colloidal assemblies but these are difficult to transfer to a solid substrate without compromising the ordering due to capillary forces acting upon drying...
September 30, 2018: ACS Omega
Mert Yigit Sengul, Clive A Randall, Adri C T van Duin
The reaction dynamics of a liquid-solid interface with the example of an acetic acid/water solution interacting with a ZnO(10-10) surface was investigated using ReaxFF reactive force field based molecular dynamics. The interactions were studied over a broad temperature range to assess the kinetics and reaction pathways. Two different acetic acid dissociation mechanisms are observed in the simulations; 1) Deprotonation to surface cation, which produces a terminal hydroxyl; and 2) Deprotonation to a bridging hydroxyl, which results in water production...
October 3, 2018: ACS Applied Materials & Interfaces
Amit Samanta, Jonathan L Belof
The first experimental insight into the nature of the liquid-solid interface occurred with the pioneering experiments of Turnbull, which simultaneously demonstrated both that metals could be deeply undercooled (and therefore had relatively large barriers to nucleation) and that the inferred interfacial free energy γ was linearly proportional to the enthalpy of fusion [D. Turnbull, J. Appl. Phys. 21 , 1022 (1950)]. By an atomistic simulation of a model face-centered cubic system via adiabatic free energy dynamics, we extend Turnbull's result to the realm of high pressure and demonstrate that the interfacial free energy, evaluated along the melting curve, remains linear with the bulk enthalpy of fusion, even up to 100 GPa...
September 28, 2018: Journal of Chemical Physics
Abdelali Khelfa, Caroline Byun, Jaysen Nelayah, Guillaume Wang, Christian Ricolleau, Damien Alloyeau
Liquid-cell TEM has enabled an interdisciplinary community of scientists to carry out atomic- / nano-scale studies of solid/liquid interfaces. Nevertheless, the restricted resolution of TEM in liquid media and the necessity to reduce the electron dose to avoid harmful radiolytic effects induced by the beam have limited the use of high resolution imaging to study the atomic structure of nanomaterials in liquid. Here we show that STEM nanodiffraction can be exploited in liquid-cell TEM experiments to overcome these two limitations...
September 17, 2018: Micron: the International Research and Review Journal for Microscopy
Yi-Jing Li, Chao-Ying Fan, Jing-Ping Zhang, Xing-Long Wu
Solid-state lithium metal batteries have emerged as a promising alternative to existing liquid Li-ion batteries and can power the future storage market considering their higher energy outputs and better safety. Among various solid electrolytes, polymer electrolytes have received more attention due to their potential advantages, including wide electrochemical windows, ease of processing, low interface impedance and low cost. Polymeric electrolytes based on poly(ethylene oxide) (PEO) as a well-known polymer matrix have been extensively studied because of their highly flexible EO segments in the amorphous phase that can provide channels for lithium ion transport...
September 25, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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