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2 results on '"Yong-Nan Guo"'

1. Buckling cluster-based H-bonded icosahedral capsules and their propagation to a robust zeolite-like supramolecular framework

Author

Zhan-Hua Zhao, Bao-Liang Han, Hai-Feng Su, Qi-Lin Guo, Wen-Xin Wang, Jing-Qiu Zhuo, Yong-Nan Guo, Jia-Long Liu, Geng-Geng Luo, Ping Cui, and Di Sun

Subjects
Science
Abstract

Abstract Hydrogen-bonded assembly of multiple components into well-defined icosahedral capsules akin to virus capsids has been elusive. In parallel, constructing robust zeolitic-like cluster-based supramolecular frameworks (CSFs) without any coordination covalent bonding linkages remains challenging. Herein, we report a cluster-based pseudoicosahedral H-bonded capsule Cu60, which is buckled by the self-organization of judiciously designed constituent copper clusters and anions. The spontaneous formation of the icosahedron in the solid state takes advantage of 48 charge-assisted CH···F hydrogen bonds between cationic clusters and anions (PF6 -), and is highly sensitive to the surface protective ligands on the clusters with minor structural modification inhibiting its formation. Most excitingly, an extended three-periodic robust zeolitic-like CSF, is constructed by edge-sharing the resultant icosahedrons. The perpendicular channels of the CSF feature unusual 3D orthogonal double-helical patterns. The CSF material not only keeps its single-crystal character in the desolvated phase, but also exhibits excellent chemical and thermal stabilities as well as long-lived phosphorescence emission.

Published
2024
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2. Kinetics of AlOOH dissolving in caustic solution studied by high-pressure DSC

Author

Guo-zhi Lü, Zhi-he Dou, Pei-yuan Ni, Yong-nan Guo, Li Bao, Xu-jian Wu, Jia Ma, and Ting-an Zhang

Subjects
Boehmite, Order of reaction, Chemistry, Inorganic chemistry, Metals and Alloys, Analytical chemistry, Activation energy, Diaspore, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, chemistry.chemical_compound, Differential scanning calorimetry, Sodium hydroxide, Materials Chemistry, Caustic (optics), Dissolution
Abstract

Mechanism functions and kinetic parameters of AlOOH (boehmite or diaspore) dissolving in sodium hydroxide solution were researched. The mixture of boehmite or diaspore and caustic solution was scanned by high-pressure differential scanning calorimetry (DSC) instrument with heating rate of 10℃/min, and differential equation method was used to analyse the DSC curves, combining with iterative method and linear least square method. The most probable mechanism functions for both boehmite or diaspore and caustic solution reactions were logically selected from 30 types of non-isothermal kinetics differential equations, according to the calculated results obtained by Matlab program. The most probable differential mechanism function of boehmite dissolving in caustic solution is f(α)=1-α, which reveals the first-order reaction with apparent activation energy of 79.178 kJ/mol and the preexponential constant 1.031×10^8 s^(-1). The function, f(α)=2(1-α)(superscript 3/2), can describe the dissolution of diaspore sample in sodium hydroxide solution. The calculated results of kinetic parameters are apparent activation energy of 73.858 kJ/mol, preexponential constant of 5.752×10^7 s^(-1) and reaction order of 1.5.

Published
2011
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