Heuristics for precise supramolecular control of soft matter structure and properties – 2,3,4-tris(dodecyloxy)benzenesulfonates with alkaline and organic cations

2017 ◽  
Vol 53 (72) ◽  
pp. 10070-10073 ◽  
Author(s):  
M. A. Shcherbina ◽  
A. V. Bakirov ◽  
U. Beginn ◽  
L. Yan ◽  
X. Zhu ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Soft Matter ◽  
Decisive Role ◽  
Comprehensive Analysis ◽  
Organic Cations ◽  
Benzenesulfonic Acid ◽  
Structure And Properties ◽  
Mesogenic Group ◽  
Supramolecular Control

Comprehensive analysis of the structure and phase behavior for a number of 2,3,4-tris(dodecyloxy)benzenesulfonic acid derivatives revealed that the shape of the mesogenic group plays a decisive role in phase behavior of the material.

scholarly journals Statistical model of phonon scattering on rough boundaries of nanostructures

2021 ◽  
Vol 2057 (1) ◽  
pp. 012111
Author(s):  
A A Barinov ◽  
V I Khvesyuk
Keyword(s):  
Heat Transfer ◽  
Statistical Model ◽  
Phonon Scattering ◽  
Rapid Development ◽  
Decisive Role ◽  
Comprehensive Analysis ◽  
Urgent Task ◽  
Semiconductor Electronics ◽  
Ballistic Heat Transfer ◽  
Rough Boundaries

Abstract Because of the rapid development of semiconductor electronics and the tendency to size reduction of the elements of transistors, there is an urgent task of assessing the heat transfer regime, which determines the ability to maintain the required thermal regime. In this work, the heat transfer in micro- and nanostructures in silicon is considered, and a comprehensive analysis of factors determining the heat transfer regime is carried out. In particular, the effect of the interaction of phonons with the sample boundaries in the quasi-ballistic and ballistic heat transfer regimes, where these processes play a decisive role, is evaluated using statistical model of phonon scattering on rough boundaries of samples.

A study on the effects of mixed organic cations on the structure and properties in lead halide perovskites

2020 ◽  
Vol 22 (5) ◽  
pp. 3105-3111 ◽  
Author(s):  
Chao Wu ◽  
Daoyou Guo ◽  
Peigang Li ◽  
Shunli Wang ◽  
Aiping Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Single Crystals ◽  
Electrical Transport ◽  
Organic Cation ◽  
Organic Cations ◽  
Structure And Properties ◽  
Electrical Transport Properties ◽  
Halide Perovskites ◽  
A Site ◽  
Lead Halide

Four types of organic cation-mixed single crystals were successfully synthesized by partially substituting A site cations to investigate the effect of organic cations on structure, optical features, thermal stability, and electrical transport properties.

The Preparation of PAN Composite TiO2 Nano-ACF and the Conditions Study

2012 ◽  
Vol 586 ◽  
pp. 58-63 ◽  
Author(s):  
Yan Bo Wu ◽  
Ying Chun Yan ◽  
Ting Lou ◽  
Tie Ben Song
Keyword(s):  
Carbon Fiber ◽  
Decisive Role ◽  
Solution Concentration ◽  
Oxidation Time ◽  
Oxidation Temperature ◽  
Structure And Properties ◽  
Optimal Conditions ◽  
Characteristic Peak ◽  
Electrostatic Spinning ◽  
Easy Operation

With its simple, easy operation, electrostatic spinning has become the most important and effective way on the preparation of nano-fibers. Through experiments, we identified the optimal conditions for the preparation of PAN nano-fibers composite TiO2 are: the spinning solution concentration is 12%, the angle is 5~8°, the spinning distance is 8cm, and the voltage is 12kV. The pre-oxidation largely determine the structure and properties of carbon fiber in the preparation of carbon nano-fibers. The temperature plays a decisive role on pre-oxidation. Through SEM、TG-DTA and FTIR, we explore the best conditions for the pre-oxidation temperature is 280°C and the pre-oxidation time is 2h. After carbonization and activation, the characteristic peak of TiO2 appeared at 2θ=25.2°, 37.7°in the patterns of XRD.

scholarly journals The structure and properties of eucalyptus fiber/phenolic foam composites under N-β(aminoethyl)-γ-aminopropyl trimethoxy silane pretreatments

2017 ◽  
Vol 19 (4) ◽  
pp. 116-121 ◽  
Author(s):  
Yufeng Ma ◽  
Chunpeng Wang ◽  
Fuxiang Chu
Keyword(s):  
Mechanical Properties ◽  
Phenolic Resin ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Comprehensive Analysis ◽  
Structure And Properties ◽  
Flame Resistance ◽  
Interfacial Compatibility ◽  
Limited Oxygen ◽  
Trimethoxy Silane

Abstract Eucalyptus fibers were modified with N-β(aminoethyl)-γ-aminopropyl trimethoxy silane to research the fiber surface’s changes and the influence of the treatment on the mechanical properties, flame resistance, thermal conductivity and microstructure of eucalyptus fiber composite phenolic foams (EFCPFs). The results showed that the partial of hemicelluloses, waxes, lignin and impurities from the fiber surface were dissolved and removed. Compared with untreated EFCPFs, the mechanical properties of treated EFCPFs were increased dramatically; The size of cells was smaller and the distribution was more uniform; The thermal conductivities were basically reduced; Especially the ratio of mass loss decreased obviously. However limited oxygen indexs (LOIs) reduced. And the mechanical properties and LOIs of EFCPFs were basically decreased with the increase of eucalyptus fibers. By comprehensive analysis, the results showed that the interfacial compatibility has been significantly improved between eucalyptus fibers and phenolic resin. And the suitable dosage of eucalyptus fibers was about 5%.

Ab initio modeling of 2D and quasi-2D lead organohalide perovskites with divalent organic cations and a tunable band gap

2020 ◽  
Vol 22 (36) ◽  
pp. 20573-20587
Author(s):  
Alberto Fraccarollo ◽  
Alberto Zoccante ◽  
Leonardo Marchese ◽  
Maurizio Cossi
Keyword(s):  
Ab Initio ◽  
Band Gap ◽  
Organic Cations ◽  
2D Systems ◽  
Structure And Properties ◽  
Lead Iodide ◽  
Ab Initio Modeling ◽  
Inorganic Layers ◽  
Tunable Band Gap

We describe theoretically the structure and properties of layered lead organohalide perovskites, considering purely bi-dimensional (2D) PbI4 layers, and quasi-2D systems where the inorganic layers are formed by more than one lead iodide sheet.

scholarly journals Supramolecular Control of Two-Dimensional Phase Behavior

2003 ◽  
Vol 9 (8) ◽  
pp. 1663-1663 ◽  
Author(s):  
Steven De Feyter ◽  
Mattias Larsson ◽  
Norbert Schuurmans ◽  
Bas Verkuijl ◽  
George Zoriniants ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Two Dimensional ◽  
Supramolecular Control

scholarly journals Symmetry breaking in particle-forming diblock polymer/homopolymer blends

2020 ◽  
Vol 117 (29) ◽  
pp. 16764-16769 ◽  
Author(s):  
Guo Kang Cheong ◽  
Frank S. Bates ◽  
Kevin D. Dorfman
Keyword(s):  
Symmetry Breaking ◽  
Phase Behavior ◽  
Soft Matter ◽  
Diblock Copolymers ◽  
Particle Analysis ◽  
Uniform Density ◽  
High Symmetry ◽  
Block Polymer ◽  
Self Consistent Field ◽  
Self Consistent Field Theory

Compositionally asymmetric diblock copolymers provide an attractive platform for understanding the emergence of tetragonally close-packed, Frank–Kasper phases in soft matter. Block-polymer phase behavior is governed by a straightforward competition between chain stretching and interfacial tension under the constraint of filling space at uniform density. Experiments have revealed that diblock copolymers with insufficient conformational asymmetry to form Frank–Kasper phases in the neat-melt state undergo an interconversion from body-centered cubic (bcc) close-packed micelles to a succession of Frank–Kasper phases (σ to C14 to C15) upon the addition of minority-block homopolymer in the dry-brush regime, accompanied by the expected transition from bcc to hexagonally packed cylinders in the wet-brush regime. Self-consistent field theory data presented here qualitatively reproduce the salient features of the experimental phase behavior. A particle-by-particle analysis of homopolymer partitioning furnishes a basis for understanding the symmetry breaking from the high-symmetry bcc phase to the lower-symmetry Frank–Kasper phases, wherein the reconfiguration of the system into polyhedra of increasing volume asymmetry delays the onset of macroscopic phase separation.

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