scholarly journals [18]Annulene put into a new perspective

2016 ◽  
Vol 52 (25) ◽  
pp. 4710-4713 ◽  
Author(s):  
Dominik Lungerich ◽  
Alexey V. Nizovtsev ◽  
Frank W. Heinemann ◽  
Frank Hampel ◽  
Karsten Meyer ◽  
...  
Keyword(s):  
Solid State ◽  
New Perspective

From a materials perspective, [18]annulene and its precursor reveal fascinating packing motifs in the solid state.

scholarly journals Visualized Spontaneous Molecular Directed Motion in Solid State

2019 ◽  
Author(s):  
Jianxun Liu ◽  
Chang Xing ◽  
Donghui Wei ◽  
Cuiping Yang ◽  
Qiuchen Peng ◽  
...  
Keyword(s):  
Solid State ◽  
Real Time ◽  
Stable State ◽  
Ordered Structure ◽  
Directed Motion ◽  
Kinetic Information ◽  
Motion Process ◽  
Fluorescence Change ◽  
New Perspective

The real-time <a>monitoring of</a> spontaneous molecular directed motion is a highly important but very challenging task. In this work, a rod-like <a>aggregation-induced emission</a> (AIE) molecule of salicylaldehyde 4-butoxyaniline Schiff base (<b>SBA</b>) was deliberately designed and facilely synthesized, which exhibits unique self-recovery property from semi-ordered structure to ordered structure alongwith significant fluorescence change after grinding. The monitoring of the fluorescence change provides rich kinetic information including kinetic order, rate constants, half-life and apparent activation energy of the spontaneous molecular directed motion process. Unlike instrumental analytical methods such as PXRD and AFM, which only give the information of a stable state of samples, the fluorescence method provided a new perspective to real-time visualize spontaneous molecular directed motion <i>in situ</i> in solid state.

scholarly journals Visualized Spontaneous Molecular Directed Motion in Solid State

2019 ◽  
Author(s):  
Jianxun Liu ◽  
Chang Xing ◽  
Donghui Wei ◽  
Cuiping Yang ◽  
Qiuchen Peng ◽  
...  
Keyword(s):  
Solid State ◽  
Real Time ◽  
Stable State ◽  
Ordered Structure ◽  
Directed Motion ◽  
Kinetic Information ◽  
Motion Process ◽  
Fluorescence Change ◽  
New Perspective

The real-time <a>monitoring of</a> spontaneous molecular directed motion is a highly important but very challenging task. In this work, a rod-like <a>aggregation-induced emission</a> (AIE) molecule of salicylaldehyde 4-butoxyaniline Schiff base (<b>SBA</b>) was deliberately designed and facilely synthesized, which exhibits unique self-recovery property from semi-ordered structure to ordered structure alongwith significant fluorescence change after grinding. The monitoring of the fluorescence change provides rich kinetic information including kinetic order, rate constants, half-life and apparent activation energy of the spontaneous molecular directed motion process. Unlike instrumental analytical methods such as PXRD and AFM, which only give the information of a stable state of samples, the fluorescence method provided a new perspective to real-time visualize spontaneous molecular directed motion <i>in situ</i> in solid state.

The electron distribution in silicon. A comparison between experiment and theory

1986 ◽  
Vol 42 (4) ◽  
pp. 271-281 ◽  
Author(s):  
M. A. Spackman
Keyword(s):  
Solid State ◽  
Electron Density ◽  
Electron Distribution ◽  
Valence Electron ◽  
Quantitative Agreement ◽  
X Ray ◽  
Structure Factors ◽  
Multipole Refinement ◽  
New Perspective ◽  
Theory And Experiment

Deformation and valence-electron densities in silicon are derived via Fourier summation and multipole refinement of highly accurate measurements of X-ray structure factors. These results provide a new perspective for the comparison between theory and experiment. The model electron density derived from experiment is in quantitative agreement with recent solid-state calculations, but not with earlier experimental results reported by Yang & Coppens [Solid State Commun. (1974), 15, 1555-1559].

scholarly journals Dynamic band structure measurement in the synthetic space

2021 ◽  
Vol 7 (2) ◽  
pp. eabe4335
Author(s):  
Guangzhen Li ◽  
Yuanlin Zheng ◽  
Avik Dutt ◽  
Danying Yu ◽  
Qingrou Shan ◽  
...  
Keyword(s):  
Solid State ◽  
Band Structure ◽  
Continuous Wave ◽  
Structure Theory ◽  
Fundamental Physics ◽  
Wave Source ◽  
New Perspective ◽  
Structure Engineering ◽  
Structure Measurement ◽  
Frequency Axis

Band structure theory plays an essential role in exploring physics in both solid-state systems and photonics. Here, we demonstrate a direct experimental measurement of the dynamic band structure in a synthetic space including the frequency axis of light, realized in a ring resonator under near-resonant dynamic modulation. This synthetic lattice exhibits the physical picture of the evolution of the wave vector reciprocal to the frequency axis in the band structure, analogous to a one-dimensional lattice under an external force. We experimentally measure the trajectories of the dynamic band structure by selectively exciting the band with a continuous wave source with its frequency scanning across the entire energy regime of the band. Our results not only provide a new perspective for exploring the dynamics in fundamental physics of solid-state and photonic systems with the concept of the synthetic dimension but also enable great capability in band structure engineering in photonics.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

The Collagenic Molecular Structural Unit of Solid State Complexes

1971 ◽  
Vol 29 ◽  
pp. 478-479
Author(s):  
Kenneth M. Richter ◽  
John A. Schilling
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Structural Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

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