A two-dimensional porous framework: solvent-induced structural transformation and selective adsorption towards malachite green

2017 ◽  
Vol 46 (26) ◽  
pp. 8350-8353 ◽  
Author(s):  
Huanzhi Li ◽  
Xueting Fang ◽  
Sha Ma ◽  
Yanfei Niu ◽  
Xiaoli Zhao ◽  
...  
Keyword(s):  
Malachite Green ◽  
Structural Transformation ◽  
Selective Adsorption ◽  
Structural Transformations ◽  
Two Dimensional ◽  
Porous Framework

A two-dimensional porous framework SHU-1 could undergo solvent-induced structural transformations to SHU-1a in methanol and SHU-1b in water. SHU-1, SHU-1a and SHU-1b showed selective adsorption towards malachite green.

Inclusion of cyclodextrins in a metallosupramolecular framework via structural transformations

CrystEngComm ◽  
2021 ◽  
Author(s):  
Supattra Somsri ◽  
Naoto Kuwamura ◽  
Tatsuhiro Kojima ◽  
Nobuto Yoshinari ◽  
Apinpus Rujiwatra ◽  
...  
Keyword(s):  
Structural Transformation ◽  
Structural Transformations ◽  
Porous Framework ◽  
Site Selective ◽  
Complex Anions

A 3D porous framework composed of D-penicillaminato AuI3CoIII2 complex anions and aqua sodium(I) cations underwent a solvent-mediated structural transformation to generate a multilayer framework, including α-CD as cyclic trimers. Site-selective...

Structural Transformation of a Germanium Σ=13 (510) [001] Tilt Grain Boundary under the Electron Beam

1990 ◽  
Vol 48 (1) ◽  
pp. 52-53 ◽  
Author(s):  
Jean-Luc Rouvière ◽  
Alain Bourret
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Grain Boundary ◽  
Structural Transformation ◽  
Mirror Symmetry ◽  
High Resolution Electron Microscopy ◽  
Structural Transformations ◽  
Covalent Bonds ◽  
Resolution Electron ◽  
Tilt Grain Boundary

The possible structural transformations during the sample preparations and the sample observations are important issues in electron microscopy. Several publications of High Resolution Electron Microscopy (HREM) have reported that structural transformations and evaporation of the thin parts of a specimen could happen in the microscope. Diffusion and preferential etchings could also occur during the sample preparation.Here we report a structural transformation of a germanium Σ=13 (510) [001] tilt grain boundary that occurred in a medium-voltage electron microscopy (JEOL 400KV).Among the different (001) tilt grain boundaries whose atomic structures were entirely determined by High Resolution Electron Microscopy (Σ = 5(310), Σ = 13 (320), Σ = 13 (510), Σ = 65 (1130), Σ = 25 (710) and Σ = 41 (910), the Σ = 13 (510) interface is the most interesting. It exhibits two kinds of structures. One of them, the M-structure, has tetracoordinated covalent bonds and is periodic (fig. 1). The other, the U-structure, is also tetracoordinated but is not strictly periodic (fig. 2). It is composed of a periodically repeated constant part that separates variable cores where some atoms can have several stable positions. The M-structure has a mirror glide symmetry. At Scherzer defocus, its HREM images have characteristic groups of three big white dots that are distributed on alternatively facing right and left arcs (fig. 1). The (001) projection of the U-structure has an apparent mirror symmetry, the portions of good coincidence zones (“perfect crystal structure”) regularly separate the variable cores regions (fig. 2).

Two-dimensional triazine-based porous framework as a novel metal-free bifunctional electrocatalyst for zinc-air batty

2021 ◽  
Vol 591 ◽  
pp. 253-263
Author(s):  
Jiameng Liu ◽  
Changbao Wang ◽  
Yingpan Song ◽  
Shuai Zhang ◽  
Zhihong Zhang ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Bifunctional Electrocatalyst ◽  
Metal Free ◽  
Porous Framework

The Eventfulness of Social Reproduction

2011 ◽  
Vol 29 (4) ◽  
pp. 294-314 ◽  
Author(s):  
Adam Moore
Keyword(s):  
Structural Transformation ◽  
Social Reproduction ◽  
Social Life ◽  
Structural Transformations ◽  
Social Structures ◽  
Stability And Change ◽  
Theoretical Assumptions

The work of William Sewell and Marshall Sahlins has led to a growing interest in recent years in events as a category of analysis and their role in the transformation of social structures. I argue that tying events solely to instances of significant structural transformation entails problematic theoretical assumptions about stability and change and produces a circumscribed field of events, undercutting the goal of developing an “eventful” account of social life. Social continuity is a state that is achieved just as much as are structural transformations, and events may be constitutive of processes of reproduction as well as change.

First-principles prediction of two-dimensional metal bis(dithiolene) complexes as promising gas sensors

2018 ◽  
Vol 20 (25) ◽  
pp. 16939-16948 ◽  
Author(s):  
Hongmei Liu ◽  
Xiaolong Li ◽  
Changmin Shi ◽  
Dongchao Wang ◽  
Li Chen ◽  
...  
Keyword(s):  
Gas Sensors ◽  
First Principles ◽  
Selective Adsorption ◽  
Two Dimensional

The selective adsorption of NO molecules on Pd- and Pt-based 2D MOFs greatly enhances the conductivity.

scholarly journals Hydrogenation Dynamics of Biphenylene Carbon (Graphenylene) Membranes

MRS Advances ◽  
2017 ◽  
Vol 2 (29) ◽  
pp. 1571-1576
Author(s):  
Vinicius Splugues ◽  
Pedro Alves da Silva Autreto ◽  
Douglas S. Galvao
Keyword(s):  
Molecular Dynamics ◽  
Large Scale ◽  
Materials Science ◽  
Md Simulations ◽  
Structural Transformations ◽  
Extensive Study ◽  
Massively Parallel ◽  
Porous Membranes ◽  
Two Dimensional ◽  
Reactive Force

ABSTRACTThe advent of graphene created a revolution in materials science. Because of this there is a renewed interest in other carbon-based structures. Graphene is the ultimate (just one atom thick) membrane. It has been proposed that graphene can work as impermeable membrane to standard gases, such argon and helium. Graphene-like porous membranes, but presenting larger porosity and potential selectivity would have many technological applications. Biphenylene carbon (BPC), sometimes called graphenylene, is one of these structures. BPC is a porous two-dimensional (planar) allotrope carbon, with its pores resembling typical sieve cavities and/or some kind of zeolites. In this work, we have investigated the hydrogenation dynamics of BPC membranes under different conditions (hydrogenation plasma density, temperature, etc.). We have carried out an extensive study through fully atomistic molecular dynamics (MD) simulations using the reactive force field ReaxFF, as implemented in the well-known Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) code. Our results show that the BPC hydrogenation processes exhibit very complex patterns and the formation of correlated domains (hydrogenated islands) observed in the case of graphene hydrogenation was also observed here. MD results also show that under hydrogenation BPC structure undergoes a change in its topology, the pores undergoing structural transformations and extensive hydrogenation can produce significant structural damages, with the formation of large defective areas and large structural holes, leading to structural collapse.

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