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Solid Liquid Interface

Melissa Hündgen, Katharina A Maier, Sigurd Höger, Stefan-S Jester
Alkoxy-substituted phenylene-ethynylene-butadiynylenes (PEBs) are connected via 1H-benzimidazole units to form H-shaped molecular scaffolds that self-assemble on graphite at the solid/liquid interface. Spacer lengths and end groups determine supramolecular tiling patterns, as shown via scanning tunneling microscopy (STM).
August 14, 2018: Chemical Communications: Chem Comm
Wei Wang, Fengxiang Guo, Zhigang Gai, Tao Zhang, Jianguo Tang, Xuelei Tian, Wenqing Liu
In order to investigate the competitive interaction between nanoparticles and twin, the eutectic Si microstructures in Al⁻10Si (wt. %) base alloys with exclusive and combined addition of Sr and Sb are characterized by combined TEM and atom probe tomography (APT). The chemical short range order in Sb⁻Sb and Sb⁻Sr pairs is revealed by ab initio molecular dynamics simulation, which promotes the formation of clusters and nanoparticles. The coexistence of nanoparticles and twins is observed in Sb containing alloys, with a negative correlation in the corresponding number density, owing to the competitive stacking of precursors and individual atoms at the solid⁻liquid interface...
August 10, 2018: Materials
D K Schreiber, D E Perea, J V Ryan, J E Evans, J D Vienna
A site-specific, cryogenic, focused ion beam (FIB) method is presented for the preparation of atom probe tomography (APT) specimens from a frozen liquid/solid interface. As a practical example, the interface between water and a corroded boroaluminosilicate glass has been characterized by APT for the first time. The water/glass interface is preserved throughout specimen preparation by plunge freezing the corroding glass particles with the corrosion solution into slush nitrogen. Site-specific specimen preparation is enabled through a new approach to extract and mount a small volume of material using a cryogenically cooled FIB stage and micromanipulator...
July 25, 2018: Ultramicroscopy
Bowen Li, Hua Chun Zeng
Intercalation of silica supported nickel nanoparticles within mesoporous silica has been achieved through chemical reduction of nickel silicate with mesoporous silica (mSiO2) coated on inner and outer surfaces. Formation of nickel nanoparticles was controlled at nickel silicate-silica interface and well confined by mSiO2 coating. Doping of other transition metals has been accomplished at the stage of nickel silicate formation, because of similarity in critical stability constants of respective metal salts. Doped nickel silicates were able to produce nickel based bimetallic and trimetallic alloy nanoparticles within the final dual shell configuration...
August 8, 2018: ACS Applied Materials & Interfaces
Katy N Olafson, R John Clark, Peter G Vekilov, Jeremy C Palmer, Jeffrey D Rimer
A critical aspect of material synthesis is solvent structuring at solid-liquid interfaces, which can impact the adsorption of solute and growth modifiers on an underlying substrate. In general, the impact of solvent structuring on molecular sorbate interactions with solids sorbents is poorly understood. This is particularly true for processes that occur in organic media, such as hematin crystallization, which is crucial to the survival of malaria parasites. Here, we use chemical force microscopy and molecular modeling to analyze the interactions between functional moieties of known antimalarials and the interface between β-hematin crystals and a mixed organic (octanol) - aqueous solvent...
August 8, 2018: ACS Applied Materials & Interfaces
Yue Gao, Daiwei Wang, Yuguang Li, Zhaoxin Yu, Thomas Mallouk, Donghai Wang
Solid-state Li metal batteries technology is extremely attractive, owing to the high energy density, long lifespans, and better safety. A key obstacle in this technology is the unstable Li/solid-state electrolyte (SSE) interface involving electrolyte reduction by Li. Here we report a novel approach based on the use of a nanocomposite consisting of organic elastomeric salts (LiO-(CH₂O)n-Li) and inorganic nanoparticle salts (LiF, -NSO₂-Li, Li₂O), which serve as an interphase to protect Li₁₀GeP₂S₁₂ (LGPS), a highly conductive but reducible SSE...
August 8, 2018: Angewandte Chemie
Ziyi Zhang, Yufeng Jiang, Caili Huang, Yu Chai, Elise Goldfine, Feng Liu, Wenqian Feng, Joe Forth, Teresa E Williams, Paul D Ashby, Thomas P Russell, Brett A Helms
Mesostructured matter composed of colloidal nanocrystals in solidified architectures abounds with broadly tunable catalytic, magnetic, optoelectronic, and energy storing properties. Less common are liquid-like assemblies of colloidal nanocrystals in a condensed phase, which may have different energy transduction behaviors owing to their dynamic character. Limiting investigations into dynamic colloidal nanocrystal architectures is the lack of schemes to control or redirect the tendency of the system to solidify...
August 2018: Science Advances
Mohana Shivanna, Qing-Yuan Yang, Alankriti Bajpai, Ewa Patyk-Kazmierczak, Michael J Zaworotko
Stimuli responsive materials (SRMs) respond to environmental changes through chemical and/or structural transformations that can be triggered by interactions at solid-gas or solid-liquid interfaces, light, pressure or temperature. SRMs span compositions as diverse as organic polymers and porous inorganic solids such as zeolites. Metal-organic materials (MOMs), sustained by metal nodes and organic linker ligands are of special interest as SRMs. SR-MOMs have thus far tended to exhibit only one type of transformation, e...
August 6, 2018: Nature Communications
Zhaohui Ren, Mengjiao Wu, Xing Chen, Wei Li, Ming Li, Fang Wang, He Tian, Junze Chen, Yanwu Xie, Jiangquan Mai, Xiang Li, Xinhui Lu, Yunhao Lu, Hua Zhang, Gustaaf Van Tendeloo, Ze Zhang, Gaorong Han
Oxide heterostructure interfaces create a platform to induce intriguing electric and magnetic functionalities for possible future devices. A general approach to control growth and interface structure of oxide heterostructures will offer a great opportunity for understanding and manipulating the functionalities. Here, it is reported that an electrostatic force, originating from a polar ferroelectric surface, can be used to drive oxide heteroepitaxy, giving rise to an atomically sharp and coherent interface by using a low-temperature solution method...
August 6, 2018: Advanced Materials
Chenhui Han, Qianling Cui, Peng Meng, Eric R Waclawik, Hengquan Yang, Jingsan Xu
Pickering emulsions are emulsions stabilized by solid particles located at surfaces/interfaces of liquid droplets that have promising applications for drug delivery and in nanomaterials synthesis. Direct observation of Pickering emulsions can be challenging. Normally, cryo-electron microscopy needs to be used to better understand these types of emulsion systems, however, cryo-freezing these emulsions may cause them to lose their original morphologies. In this work, we demonstrate that graphitic carbon nitride (g-C3N4) can stabilize oil-in-water (o/w) emulsions, with hexane illustrated as a typical oil phase...
August 4, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zhen Liu, Guozhu Li, Andriy Borodin, Xiaoxu Liu, Yao Li, Frank Endres
Investigations of the solid-electrolyte interphase formation on a silicon anode are of great interest for future lithium-ion batteries. We have studied the interactions of the ionic liquid 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl) amide ([OMIm]Tf2N) and of lithium with Si(111) surfaces on a molecular level by X-ray photoelectron spectroscopy. The interaction of Li with [OMIm]Tf2N on Si(111) results in the decomposition of both the cation and the anion and the intercalation of lithium. Lithium atoms donate the electrons to the [OMIm]+ cation, forming Li+, and at the same time the alkyl group is detached from the cation...
August 1, 2018: Journal of Physical Chemistry Letters
C Ulises Gonzalez-Valle, Satish Kumar, Bladimir Ramos-Alvarado
Thermal transport across interfaces made of 3C-type silicon carbide (SiC) and water was investigated by means of nonequilibrium classical molecular dynamics (NEMD). The effects of different crystallographic planes and atomic surface terminations were studied, as it pertains to interfacial heat transfer. Hydrophilic and hydrophobic conditions were analyzed by modifying the interfacial bonding strength between the solid and liquid phases. The formation of structures in the liquid molecules close to the solid substrate was observed and found that such structures are sensitive to the uppermost atomic layer termination, the wettability condition, and the temperature of the system...
July 31, 2018: ACS Applied Materials & Interfaces
Anaïs Giustiniani, Simon Weis, Christophe Poulard, Paul H Kamm, Francisco García-Moreno, Matthias Schröter, Wiebke Drenckhan
Our understanding of the structural features of foams and emulsions has advanced significantly over the last 20 years. However, with a search for "super-stable" liquid dispersions, foam and emulsion science employs increasingly complex formulations which create solid-like visco-elastic layers at the bubble/drop surfaces. These lead to elastic, adhesive and frictional forces between bubbles/drops, impacting strongly how they pack and deform against each other, asking for an adaptation of the currently available structural description...
July 31, 2018: Soft Matter
Jacob R Jokisaari, Jordan A Hachtel, Xuan Hu, Arijita Mukherjee, Canhui Wang, Andrea Konecna, Tracy C Lovejoy, Niklas Dellby, Javier Aizpurua, Ondrej L Krivanek, Juan-Carlos Idrobo, Robert F Klie
The ability to examine the vibrational spectra of liquids with nanometer spatial resolution will greatly expand the potential to study liquids and liquid interfaces. In fact, the fundamental properties of water, including complexities in its phase diagram, electrochemistry, and bonding due to nanoscale confinement are current research topics. For any liquid, direct investigation of ordered liquid structures, interfacial double layers, and adsorbed species at liquid-solid interfaces are of interest. Here, a novel way of characterizing the vibrational properties of liquid water with high spatial resolution using transmission electron microscopy is reported...
July 30, 2018: Advanced Materials
Jin Xie, Jiangyan Wang, Hye Ryoung Lee, Kai Yan, Yuzhang Li, Feifei Shi, William Huang, Allen Pei, Gilbert Chen, Ram Subbaraman, Jake Christensen, Yi Cui
Lithium metal has long been considered one of the most promising anode materials for advanced lithium batteries (for example, Li-S and Li-O2 ), which could offer significantly improved energy density compared to state-of-the-art lithium ion batteries. Despite decades of intense research efforts, its commercialization remains limited by poor cyclability and safety concerns of lithium metal anodes. One root cause is the parasitic reaction between metallic lithium and the organic liquid electrolyte, resulting in continuous formation of an unstable solid electrolyte interphase, which consumes both active lithium and electrolyte...
July 2018: Science Advances
Jorge Ruíz-Olles, David K Smith
This paper explores macroscopic-scale diffusion of the molecular-scale building blocks of two-component self-assembled organogel nanofibres using a diffusion cell in which two different gels are in contact with one another. Both components of the 'solid-like' nanofibres (lysine peptide dendron acids and amines) can diffuse through these gels and across a gel-gel interface, although diffusion is significantly slower than that of a non-interactive additive in the 'liquid-like' phase of the gel. Amine diffusion was probed by bringing similar gels with different amines into contact...
July 7, 2018: Chemical Science
Bastiaan Molleman, Tjisse Hiemstra
Surface energy is a fundamental property of metallic nanoparticles (MeNPs), which plays a crucial role in nucleation and growth and has strong implications for the application and environmental impact of MeNPs. Surface energy (J m-2) can be size dependent, but experimental data on surface energy trends for MeNPs are inconclusive. Computational chemistry may resolve the issue, but the location and area of the surface used for scaling, which dramatically influences the outcome and interpretation, has not been properly investigated...
July 30, 2018: Physical Chemistry Chemical Physics: PCCP
Yuan Fang, Mihaela Cibian, Garry S Hanan, Dmitrii F Perepichka, Steven De Feyter, Louis A Cuccia, Oleksandr Ivasenko
Controlled double-deck packing is an appealing means to expand upon conventional 2D self-assembly which is critical in crystal engineering, yet it is rare and poorly understood. Herein, we report the first systematic study of double-deck assembly in a series of alkylated aminoquinone derivatives at the liquid-solid interface. The competition between the fraction of alkyl chains adsorbed on the surface and the optimal conformation of the alkyl chains near the head group leads to a stepwise structural transformation ranging from complete double-deck packing to complete monolayer packing...
July 27, 2018: Nanoscale
Meihang He, Yangchao Zhou, Weiwei Cui, Yang Yang, Hongxiang Zhang, Xuejiao Chen, Wei Pang, Xuexin Duan
On-demand droplet dispensing systems are indispensable tools in bioanalytical fields, such as microarray fabrication. Biomaterial solutions can be very limited and expensive, so minimizing the use of solution per spot produced is highly desirable. Here, we proposed a novel droplet dispensing method which utilizes a gigahertz (GHz) acoustic resonator to deposit well-defined droplets on-demand. This ultra-high frequency acoustic resonator induces a highly localized and strong body force at the solid-liquid interface, which pushes the liquid to generate a stable and sharp "liquid needle" and further delivers droplets to the target substrate surface by transient contact...
July 25, 2018: Lab on a Chip
Marcel Rey, Taotao Yu, Karina Bley, Katharina Landfester, D Martin A Buzza, Nicolas Vogel
Spherical colloidal particles typically self-assemble into hexagonal lattices when adsorbed at liquid interfaces. More complex assembly structures, including particle chains and phases with square symmetry, were theoretically predicted almost two decades ago for spherical particles interacting via a soft repulsive shoulder. Here, we demonstrate that such complex assembly phases can be experimentally realized with spherical colloidal particles assembled at the air/water interface in the presence of molecular amphiphiles...
July 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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