scholarly journals A low-temperature hydrothermal synthesis of submicron spherical BaF2

RSC Advances ◽  
2021 ◽  
Vol 11 (63) ◽  
pp. 40051-40058
Author(s):  
Xiao Li ◽  
Yuxiang Zhao ◽  
Bo Li ◽  
Shuxuan Wang ◽  
Xingwu Zou
Keyword(s):  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Self Assembly ◽  
The Self ◽  
Spherical Particles

BaF2 submicron spherical particles, formed by the self-assembly of nanocubes, were prepared by a low-temperature hydrothermal method with the aid of EDTA-2Na.

Large-Scale Self-Assembly in Weakly-Flocculated Suspensions

2019 ◽  
Vol 4 (1) ◽  
pp. 68-74
Author(s):  
Aleš Dakskobler ◽  
Matjaz Valant
Keyword(s):  
Self Assembly ◽  
Shear Force ◽  
Large Scale ◽  
Hard Spheres ◽  
Colloidal Crystals ◽  
The Self ◽  
Spherical Particles ◽  
Particle Interactions ◽  
Concentrated Suspensions ◽  
Average Angle

Background: Studies on the formation of colloidal crystals in concentrated suspensions have mainly been based on dispersed suspensions with a repulsive inter-particle potential of hard or nearly hard spheres. The self-assembly in weakly-flocculated suspensions has still been unrealized. Here, we report on the formation of ordered structures in concentrated suspensions of nearly-hard spherical particles with weakly-attractive inter-particle interactions that are an order of magnitude higher than the particles’ thermal energy. Methods: In our case, the self-assembly in such suspensions is not thermodynamically driven, but an external shear force must be applied. The driving force for the particles’ ordering is an increase in the inter-particle interactions. This manifests itself in a decrease in the average angle between the interparticle interaction direction and the applied shear stress direction. Results: For a successful ordering into a large-scale closed packed assembly, the external shear force must not exceed the inter-particle attractive interaction for the minimum possible average angle (as in the closed packed structures) but be high enough to enable the particles to move in the highly loaded suspension. Conclusion: The developed method for the self-assembly of the weakly flocculated systems can be applied very generally e.g. a control over a composition of heterogeneous colloidal crystals, manufacturing of the large-scale photonic crystals or preparation of very densely packed compacts of particles needed for the production of sintered ceramics.

Edge Transport and Self-Assembly of Passive Objects in a Chiral Active Fluid*

2021 ◽  
Vol 38 (12) ◽  
pp. 128701
Author(s):  
Qing Yang ◽  
Huan Liang ◽  
Rui Liu ◽  
Ke Chen ◽  
Fangfu Ye ◽  
...  
Keyword(s):  
Transport Phenomenon ◽  
Computer Simulations ◽  
Self Assembly ◽  
Vital Role ◽  
The Self ◽  
Spherical Particles ◽  
Stable Clusters ◽  
Assembly Behavior ◽  
Insight Into ◽  
Edge Flow

Abstract Topological edge flow and dissipationless odd viscosity are two remarkable features of chiral active fluids composed of active spinners. These features can significantly influence the dynamics of suspended passive particles and the interactions between the particles. By computer simulations, we investigate the transport phenomenon of anisotropic passive objects and the self-assembly behavior of passive spherical particles in the active spinner fluid. It is found that in confined systems, nonspherical passive objects can stably cling to boundary walls and are unidirectionally and robustly transported by edge flow of spinners. Furthermore, in an unconfined system, passive spherical particles are able to form stable clusters that spontaneously and unidirectionally rotate as a whole. In these phenomena, strong particle-wall and interparticle effective attractions play a vital role, which originate from spinner-mediated depletion-like interactions and can be largely enhanced by odd viscosity of spinner fluids. Our results thus provide new insight into the robust transport of cargoes and the nonequilibrium self-assembly of passive intruders.

scholarly journals Enhanced Photocatalytic Activity of TiO2/SnO2 Binary Nanocomposites

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Tetiana A. Dontsova ◽  
Anastasiya S. Kutuzova ◽  
Kateryna O. Bila ◽  
Svitlana O. Kyrii ◽  
Iryna V. Kosogina ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Oxide Content ◽  
Porous Structures ◽  
Anionic Dyes ◽  
Commercial Sample ◽  
X Ray ◽  
Adsorption Desorption

The paper presents the results of characterization and study of adsorption-photocatalytic properties of commercial and synthesized-by-hydrothermal method TiO2 and TiO2-SnO2 nanocomposites. Hydrothermal synthesis of TiO2-based nanocomposites was performed in two ways: single-stage and two-stage methods. Characterization was carried out by XRD, X-ray fluorescence method, XPS, EPR, PL, and low-temperature adsorption-desorption of nitrogen, which showed that TiO2-SnO2 nanostructured composites were obtained with tin(IV) oxide content of 10 wt.% and had acidic surface and different porous structures. Besides, modification of a commercial sample with tin(IV) oxide led to a slight decrease in the specific surface area, while modification of a synthesized-by-hydrothermal method TiO2 sample led to an increase. It was found that sorption properties of the obtained nanocomposites and pure TiO2 are better towards anionic dyes. Photocatalytic activity, on the contrary, is higher towards cationic dyes, which is consistent with additional studies on the destruction of these dyes. It was established that in terms of photocatalytic activity, TiO2-SnO2 nanocomposites are more promising than solid solutions, and modification of TiO2 with tin(IV) oxide, in general, leads to improvement of its photocatalytic activity.

scholarly journals Visualization of Iron-Binding Micelles in Acidic Recombinant Biomineralization Protein, MamC

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Sanjay Kashyap ◽  
Taylor Woehl ◽  
Carmen Valverde-Tercedor ◽  
Miguel Sánchez-Quesada ◽  
Concepción Jiménez López ◽  
...  
Keyword(s):  
Low Temperature ◽  
Self Assembly ◽  
Inorganic Nanoparticles ◽  
The Self ◽  
Synthetic Methods ◽  
Biological Macromolecules ◽  
Iron Binding ◽  
Precise Control ◽  
Iron Binding Protein

Biological macromolecules are utilized in low-temperature synthetic methods to exert precise control over nanoparticle nucleation and placement. They enable low-temperature formation of a variety of functional nanostructured materials with properties often not achieved via conventional synthetic techniques. Here we report on thein situvisualization of a novel acidic bacterial recombinant protein, MamC, commonly present in the magnetosome membrane of several magnetotactic bacteria, includingMagnetococcus marinus, strain MC-1. Our findings provide an insight into the self-assembly of MamC and point to formation of the extended protein surface, which is assumed to play an important role in the formation of biotemplated inorganic nanoparticles. The self-organization of MamC is compared to the behavior of another acidic recombinant iron-binding protein, Mms6.

Low Temperature Synthesis of PbTiO3 Nanoparticles

2005 ◽  
Vol 475-479 ◽  
pp. 3517-3520
Author(s):  
Yu Jing Sun ◽  
Shi Tian ◽  
Xiao Bing Li
Keyword(s):  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Tetragonal Phase ◽  
Lead Acetate ◽  
Average Diameter ◽  
Effect Of Temperature ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

PbTiO3 nano-sized powders were synthesized at 150oC by a new hydrothermal [denoted as sol-hydrothermal] method by using modified titanium tetra-n-butoxide and lead acetate as the precursors. Furthermore, tetragonal PbTi0.8O2.6 nano-sized powders were obtained by this method at 80oC. Compared with hydrothermal synthesis, the effect of temperature on the formation of products prepared by sol-hydrothermal was investigated. The characteristics of products were studied by XRD, TEM and SAXS. The results show sol-hydrothermal method choosing acetylacetonate-modified titanium tetra-n-butoxide and lead acetate to form a sol could obtain PbTiO3 in 120nm size and PbTi0.8O2.6 powders with average diameter of 30nm, and both of them are pure tetragonal phase. In addition, PbTi0.8O2.6 could be converted into PbTiO3 gradually after annealed at giving condition.

A low temperature hydrothermal synthesis of delafossite CuCoO2 as an efficient electrocatalyst for the oxygen evolution reaction in alkaline solutions

2018 ◽  
Vol 5 (1) ◽  
pp. 183-188 ◽  
Author(s):  
Zijuan Du ◽  
Dehua Xiong ◽  
Santosh Kumar Verma ◽  
Baoshun Liu ◽  
Xiujian Zhao ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Oxygen Evolution ◽  
Alkaline Solution ◽  
Oxygen Evolution Reaction ◽  
Alkaline Solutions

CuCoO2 crystals were prepared at 100 °C through a hydrothermal method and used for the oxygen evolution reaction in alkaline solution.

Interaction of diatomic ligands with Fe(II) meso-mono-4-pyridyl-tri-phenyl-porphyrinate. Spectral evidence of self-assembly in sublimed layers

2003 ◽  
Vol 07 (09) ◽  
pp. 623-629 ◽  
Author(s):  
Tigran S. Kurtikyan ◽  
J. Steven Ogden ◽  
Robert K. Kazaryan ◽  
Valery N. Madakyan
Keyword(s):  
Low Temperature ◽  
Self Assembly ◽  
Thin Layers ◽  
The Self ◽  
Ambient Conditions ◽  
Visible Spectroscopy ◽  
Pyridyl Group ◽  
Sublimed Layers ◽  
Uv Visible ◽  
Adjacent Molecule

The interaction of CO , NO and O2 gases with thin layers of meso-mono-4-pyridyl-tri-phenylporphyrinatoiron(II) ( FeMPyTPP ) obtained by sublimation onto low-temperature (T = 77 K ) substrates has been investigated by means of IR and UV-visible spectroscopy. In contrast to the closely-related meso-tetraphenylporphyrinatoiron(II) ( FeTPP ), the formation of two types of axial complexes has been observed. In one of these the 5th coordination site is occupied by the pyridyl group of an adjacent molecule indicating the self-assembly of Fe ( MPyTPP ) in layers with formation of coordinatively linked oligomers. The degree of oligomerisation depends on the nature of the interacting gas. Due to the specificity of the supramolecular structure, the layers are fairly stable in ambient conditions and conserve their microporosity to bind reversibly with the aforementioned ligands.

A description of the formation and growth processes of CaTiO3 mesocrystals: a joint experimental and theoretical approach

2020 ◽  
Vol 5 (7) ◽  
pp. 1255-1266
Author(s):  
Mario L. Moreira ◽  
José Rafael Bordin ◽  
Juan Andrés ◽  
José A. Varela ◽  
Elson Longo
Keyword(s):  
Hydrothermal Synthesis ◽  
Theoretical Approach ◽  
Self Assembly ◽  
Theoretical Study ◽  
The Self ◽  
Growth Processes ◽  
Microwave Assisted ◽  
Assembly Mechanism

We report a combined experimental and theoretical study to rationalize the self-assembly mechanism of CaTiO3 mesocrystals through microwave-assisted hydrothermal synthesis.

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