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Solid Liquid Interface

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https://www.readbyqxmd.com/read/30516387/charged-polystyrene-nanoparticles-near-a-sio2-water-interface
#1
Maja S Hellsing, Adrian R Rennie, Michael Rodal, Fredrik Höök
Quartz crystal microbalance with dissipation (QCM-D) monitoring is traditionally used to investigate adsorption processes at liquid-solid interfaces but has also been applied increasingly to characterize the viscoelastic properties of complex liquids. Here, we contribute new insights to the latter field by using QCM-D to investigate the structure near an interface and high-frequency viscoelastic properties of charge stabilized polystyrene particles (radius 37 nm) dispersed in pure water. The study reveals changes with increasing ionic-strength from the crystalline order at low salt concentration to that with a less-structured particle distribution at high ionic strength...
December 5, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30515895/double-layer-polymer-electrolyte-for-high-voltage-all-solid-state-rechargeable-batteries
#2
Weidong Zhou, Zhaoxu Wang, Yuan Pu, Yutao Li, Sen Xin, Xiaofang Li, Jianfeng Chen, John B Goodenough
No single polymer or liquid electrolyte has a large enough energy gap between the empty and occupied electronic states for both dendrite-free plating of a lithium-metal anode and a Li+ extraction from an oxide host cathode without electrolyte oxidation in a high-voltage cell during the charge process. Therefore, a double-layer polymer electrolyte is investigated, in which one polymer provides dendrite-free plating of a Li-metal anode and the other allows a Li+ extraction from an oxide host cathode without oxidation of the electrolyte in a 4 V cell over a stable charge/discharge cycling at 65 °C; a poly(ethylene oxide) polymer contacts the lithium-metal anode and a poly(N-methyl-malonic amide) contacts the cathode...
December 5, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30515499/self-propelled-droplet-based-electricity-generation
#3
Chaoran Liu, Jing Sun, Yu Zhuang, Jie Wei, Jing Li, Linxi Dong, Dongfang Yan, Alice Hu, Xiaofeng Zhou, Zuankai Wang
Droplets are ubiquitous in nature and the preferential control of droplet transport offers limitless potential for efficient mass and momentum transfer as well as energy conversion. In this work, we show that even without the need for any external energy input, the self-propelled motion of droplets driven by a surface wetting gradient can lead to reliable electricity generation. Simple analytical analysis demonstrates that the output voltage results from the modulation of the surface charge distribution on the dynamically changing solid/liquid interfaces, which can be programmed by tailoring the wetting gradient and the size of the droplet...
December 5, 2018: Nanoscale
https://www.readbyqxmd.com/read/30512927/single-layer-graphene-for-estimation-of-axial-spatial-resolution-in-confocal-raman-microscopy-depth-profiling
#4
Carol Korzeniewski, Jay P Kitt, Saheed Bukola, Stephen E Creager, Shelley D Minteer, Joel M Harris
Single layer graphene (SLG), with its angstrom-scale thickness and strong Raman scattering cross section, was adapted for measurement of the axial (Z-direction) probe beam profile in confocal Raman microscopy depth-profiling experiments. SLG adsorbed to a glass microscope coverslip (SLG/SiO2 ) served as a platform for estimation of axial spatial resolution. Profiles were measured by stepping the confocal probe volume through the SLG/SiO2 interface while measuring Raman scattering from the sample. Using a high numerical aperture (1...
December 4, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30504679/novel-strategy-for-the-systemic-delivery-of-furosemide-based-on-a-new-drug-transport-mechanism
#5
Shunsuke Kimura, Akiko Kiriyama, Erika Nishimura, Shiori Sakata, Daisuke Inoue, Tomoyuki Furubayashi, Reiko Yutani, Akiko Tanaka, Kosuke Kusamori, Hidemasa Katsumi, Katsumi Iga, Akira Yamamoto, Toshiyasu Sakane
We reported a novel transport mechanism of curcumin, independent of improved solubility, which involved direct contact of amorphous solid particles with the cell membrane. This mechanism has potential as a novel systemic delivery system of poorly water-soluble drugs. In this study, the transport mechanism of furosemide (FUR), which is transported by the same novel mechanism, was examined. In vitro cell permeation studies under air-interface conditions (AICs) revealed that the permeation from powders sprayed on cell monolayers was significantly higher than that under liquid-covered conditions (LCCs) from their solutions...
2018: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/30504080/dynamics-of-gold-nanoparticle-clusters-observed-with-liquid-phase-electron-microscopy
#6
Elisa Cepeda-Pérez, Niels de Jonge
The dynamics of processes of nanoparticles such as diffusion, attraction and repulsion, and self-assembly of structures of nanoparticles at the solid-liquid interfaces differ significantly from those occurring for bulk conditions and their fundamental physical rules are still unknown. Here, we used liquid phase scanning transmission electron microscopy (LP-STEM) to study several aspects of nanoparticle dynamics of colloidal chitosan coated gold nanoparticle (TCHIT-AuNP) clusters in a liquid layer enclosed between two SiN membranes...
November 23, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30501361/enabling-liquid-vapor-analysis-using-synchrotron-vuv-single-photon-ionization-mass-spectrometry-with-a-microfluidic-interface
#7
R Komorek, B Xu, J Yao, U Ablikim, T P Troy, O Kostko, M Ahmed, X Y Yu
Vacuum ultraviolet (VUV) single photon ionization mass spectrometry (SPI-MS) is a vacuum-based technique typically used for the analysis of gas phase and solid samples, but not for liquids due to the challenge in introducing volatile liquids in a vacuum. Here we present the first demonstration of in situ liquid analysis by integrating the System for Analysis at the Liquid Vacuum Interface (SALVI) microfluidic reactor into VUV SPI-MS. Four representative volatile organic compound (VOC) solutions were used to illustrate the feasibility of liquid analysis...
November 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/30501323/electrochemistry-in-ultra-high-vacuum-the-fully-transferrable-ultra-high-vacuum-compatible-electrochemical-cell
#8
P Kerger, D Vogel, M Rohwerder
A new experimental setup for in situ / operando investigations of redox reactions is introduced. This setup, in combination with ultra-high vacuum (UHV) methods from the field of surface science, provides completely new possibilities to investigate electrochemical redox reactions. Two types of cells are distinguished conceptionally: in the permeation configuration, the working electrode is electrochemically polarised on one side of a membrane (entry side), leading to atomic hydrogen uptake, and allowing proton and electron exchange between the entry and the other side (exit side) of the membrane...
November 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/30501167/dynamics-of-dna-origami-lattice-formation-at-solid-liquid-interfaces
#9
Charlotte Kielar, Saminathan Ramakrishnan, Sebastian Fricke, Guido Grundmeier, Adrian Keller
The self-organized formation of regular patterns is not only a fascinating topic encountered in a multitude of natural and artificial systems, but also presents a versatile and powerful route towards large-scale nanostructure assembly and materials synthesis. The hierarchical, interface-assisted assembly of DNA origami nanostructures into regular, 2D lattices represents a particularly promising example, as the resulting lattices may exhibit an astonishing degree of order and can be further utilized as masks in molecular lithography...
December 3, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30500015/3d-structure-of-the-electric-double-layer-of-ionic-liquid-alcohol-mixtures-at-the-electrochemical-interface
#10
José M Otero-Mato, Hadrián Montes-Campos, Oscar Cabeza, Diddo Diddens, Alina Ciach, Luis J Gallego, Luis M Varela
Mixtures of the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate with amphiphilic cosolvents, such as methanol and ethanol, nanoconfined between graphene walls are studied by means of molecular dynamics simulations and the results are compared with those of the pure ionic liquid and its mixtures with water confined in the same conditions. We investigate the adsorption of cosolvent molecules at the graphene walls as well as their distribution across the system. The results show that, due to a higher affinity of the polar groups to be close to the anions in combination with the electrostatic and excluded volume interactions, there exists a high tendency of the OH groups to lie close to the anode, inducing small changes in the first cation layer...
November 30, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30487397/solidification-and-segregation-behaviors-of-superalloy-in718-at-a-slow-cooling-rate
#11
Xiao Shi, Shengchao Duan, Wensheng Yang, Hanjie Guo, Jing Guo
The solidification and micro- and macro-segregation behaviors of as-cast INCONEL 718 (IN718) alloy at different temperatures under a slow cooling rate (5 °C/min) were investigated in this study. The results indicate that the solid-liquid interface grows into reticulation of hexagons during solidification. The variation trend of the solid fraction and transition rate of the solid phase with solidification time can be well characterized by the Boltzmann and Gaussian distribution, respectively. The order of segregation degree of negative segregation elements is: Fe > Cr > Al...
November 28, 2018: Materials
https://www.readbyqxmd.com/read/30486928/nanowire-growths-and-mechanisms-of-these-growths-for-developing-novel-nanomaterials
#12
Saeed Ganji
Nanowire nanoelectronics depends largely on nanowire materials characteristics. The nanowires are grown by a number of different mechanisms. A comparative and comprehensive investigation of nanowires by these mechanisms has been carried out to address the nanowire characteristics best suited to nanoelectronics. The development and optimization of nanowire processing techniques for viable nanowire nanoelectronics have also been elucidated. The fundamentals of the growth mechanisms that lead to the best possible nanowires have been evaluated, as well...
April 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30484923/a-surface-functionalized-ionovoltaic-device-for-probing-ion-specific-adsorption-at-the-solid-liquid-interface
#13
Sun Geun Yoon, YoungJun Yang, Huding Jin, Won Hyung Lee, Ahrum Sohn, Sang-Woo Kim, Junwoo Park, Youn Sang Kim
Aqueous ion-solid interfacial interactions at an electric double layer (EDL) are studied in various research fields. However, details of the interactions at the EDL are still not fully understood due to complexity induced from the specific conditions of the solid and liquid parts. Several technical tools for ion-solid interfacial probing are experimentally and practically proposed, but they still show limitations in applicability due to the complicated measurements. Recently, an energy conversion device based on ion dynamics (called ionovoltaic device) was also introduced as another monitoring tool for the EDL, showing applicability as a novel probing method for interfacial interactions...
November 28, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30479055/bridging-surface-charge-and-catalytic-activity-of-defective-carbon-electrocatalyst
#14
Shuangyin Wang, Li Tao, Man Qiao, Rong Jin, Yan Li, Zhaohui Xiao, Yuqing Wang, Nana Zhang, Chao Xie, Qinggang He, Dechen Jian, Gang Yu, Yafei Li
Electrocatalysis is dominated by reaction at the solid-liquid-gas interface, and the surface properties of electrocatalysts determine the electrochemical behavior. The surface charge (electronic properties) of active sites on catalysts can significantly modulate the adsorption and desorption of intermediates and tune the electrocatalysis. However, there is no direct evidence to bridge the surface charge and catalytic activity of active sites. In this work, we controllably created defects (active sites) on HOPG (highly oriented pyrolytic graphite) surface and broke the intrinsic sp2-hybridization of graphite by plasma, which induces the localization of surface charge onto defective active sites, as proved by scanning ion conductance microscopy (SICM) and Kelvin probe force microscopy (KPFM)...
November 26, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30477174/pzt-based-ultrasonic-guided-wave-frequency-dispersion-characteristics-of-tubular-structures-for-different-interfacial-boundaries
#15
Shi Yan, Bowen Zhang, Gangbing Song, Jiaoyun Lin
For tubular structures, ultrasonic guided waves (UGWs) which are closely related to interfacial boundary conditions such as gas, liquid and solid materials, are usually used in damage detection. Due to the different phase materials inside tubes, the interfacial boundary (connection) conditions are variable, which has a great influence on the dispersion-related UGW propagation characteristics. However, most UGW-based damage detection methods only consider the pipeline structures as hollow tubes, ignoring the interfacial boundary condition influences on the UGW propagation...
November 23, 2018: Sensors
https://www.readbyqxmd.com/read/30468223/molecular-dynamics-study-on-the-heterogeneous-nucleation-of-liquid-al-cu-alloys-on-different-kinds-of-copper-substrates
#16
Honghui Lin, Tao Li, Hui Li
Al-Cu alloys are widely used in aeronautics and aerospace engineering because they exhibit outstanding performance. However, their casting characteristics are poor. Heterogeneous nucleation plays a significant role in controlling crystal growth. MD simulations are performed to explore the heterogeneous nucleation of liquid Al-Cu on a copper substrate including the heat-up process, preservation process, and freezing process. The simulation results show that the Al-Cu melt becomes layered at the liquid-solid interface and tends to be ordered in the structure because of the induced effect from the substrate...
November 23, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30465645/the-quantity-and-distribution-of-biofilm-growth-of-escherichia-coli-strain-atcc-9723-depends-on-the-carbon-energy-source
#17
Sarah L Sutrina, Stacey Callender, TerrieAnne Grazette, Petrina Scantlebury, Shaka O'Neal, Kiara Thomas, Danielle C Harris, Marilaine Mota-Meira
Escherichia coli strain 15 (ATCC 9723) formed robust biofilms of two distinct forms on glass tubes. In rich, low-osmolarity medium, the biofilms were restricted to the air/liquid interface, resulting in rings attached to the glass. As it was not evident that these biofilms extended across the liquid surface, we termed them 'ring' rather than 'pellicle' biofilms. In minimal medium supplemented with a non-fermentable substrate as the carbon/energy source, we observed either robust ring biofilms or little biofilm of any type, depending on the substrate...
November 22, 2018: Microbiology
https://www.readbyqxmd.com/read/30462119/interfacial-premelting-of-ice-in-nano-composite-materials
#18
Hailong Li, Markus Bier, Julian Mars, Henning Weiss, Ann-Christin Dippel, Olof Gutowski, Veijo Honkimäki, Markus Mezger
The interfacial premelting in ice/clay nano composites was studied by high energy X-ray diffraction. Below the melting point of bulk water, the formation of liquid water was observed for the ice/vermiculite and ice/kaolin systems. The liquid fraction is gradually increasing with temperature. For both minerals, similar effective premelting layer thicknesses of 2-3 nm are reached 3 K below the bulk melting point. For the quantitative description of the molten water fraction in wet clay minerals we developed a continuum model for short range interactions and arbitrary pore size distributions...
November 21, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30462056/broadband-infrared-mueller-matrix-ellipsometry-for-studies-of-structured-surfaces-and-thin-films
#19
Andreas Furchner, Cordula Walder, Matthias Zellmeier, Jörg Rappich, Karsten Hinrichs
We present a high-optical-throughput infrared Mueller-matrix (MM) ellipsometer for the characterization of structured surfaces and ultrathin films. Its unprecedented sensitivity of about 10-4 in the normalized MM elements enables studies of the complex vibrational fingerprint of thin organic films under different ambient conditions. The ellipsometer acquires quadruples of MM elements within a few 10 s to min, rendering it interesting for process and in-line monitoring. It uses retractable achromatic retarders for increased signal to noise, and tandem wire-grid polarizers for improved polarization control...
September 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/30455289/elastic-and-li-ion-percolating-hybrid-membrane-stabilizes-li-metal-plating
#20
Quan Pang, Laidong Zhou, Linda F Nazar
Lithium metal batteries are capable of revolutionizing the battery marketplace for electrical vehicles, owing to the high capacity and low voltage offered by Li metal. Current exploitation of Li metal electrodes, however, is plagued by their exhaustive parasitic reactions with liquid electrolytes and dendritic growth, which pose concerns to both cell performance and safety. We demonstrate that a hybrid membrane, both elastic and Li+ -ion percolating, can stabilize Li plating/stripping with high Coulombic efficiency...
November 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
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