scholarly journals Thermally Induced Structural Transitions of Nylon 4 9 as a New Example of Even–Odd Polyamides

Polymers ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 198 ◽  
Author(s):  
Cristian Olmo ◽  
Maria Teresa Casas ◽  
Juan Carlos Martínez ◽  
Lourdes Franco ◽  
Jordi Puiggalí
Keyword(s):  
Structural Transitions ◽  
Thermally Induced ◽  
Nylon 4

In Situ Observation of Thermally Induced Structural Transitions in Vacancy-Doped Cuprous Telluride (Cu2–xTe) Nanowires Using Raman Spectroscopy

2019 ◽  
Vol 123 (40) ◽  
pp. 24763-24771 ◽  
Author(s):  
Caiju Chen ◽  
Mengling Liao ◽  
Beibei Shan ◽  
Ming Li
Keyword(s):  
Raman Spectroscopy ◽  
In Situ Observation ◽  
Structural Transitions ◽  
Thermally Induced

scholarly journals Thermally Induced Structural Transitions between Single-Crystalline States in the First Hybrid Compound Combining Keggin-Type Clusters with Metal-Cyclam Complexes: From Two-Dimensional Covalent Assemblies to Discrete Molecular Species

2020 ◽  
Vol 20 (5) ◽  
pp. 3499-3509
Author(s):  
Leticia Fernández-Navarro ◽  
Amaia Iturrospe ◽  
Santiago Reinoso ◽  
Beñat Artetxe ◽  
Estibaliz Ruiz-Bilbao ◽  
...  
Keyword(s):  
Molecular Species ◽  
Two Dimensional ◽  
Structural Transitions ◽  
Hybrid Compound ◽  
Single Crystalline ◽  
Thermally Induced ◽  
Keggin Type ◽  
Cyclam Complexes

scholarly journals STRUCTURAL STABILITY OF Ag AND Ag NANOCLUSTERS WITH A CHANGE IN THE INITIAL MORPHOLOGY

2021 ◽  
pp. 604-611
Author(s):  
Дарья Антоновна Рыжкова ◽  
Светлана Леонидовна Гафнер ◽  
Юрий Яковлевич Гафнер
Keyword(s):  
Tight Binding ◽  
Thermal Relaxation ◽  
Silver Nanoclusters ◽  
Binding Potential ◽  
Magic Numbers ◽  
Structural Transitions ◽  
Thermally Induced ◽  
Second Moment ◽  
Moment Approximation ◽  
Dynamics Method

В статье методом молекулярной динамики с использованием модифицированного потенциала сильной связи TB-SMA (second moment approximation of tight-binding) проводится сравнительный анализ характера термически индуцированных структурных переходов в нанокластерах серебра, число атомов в которых соответствует «магическим» числам икосаэдрической структуры, при вариации их начальной морфологии. Показано, что в случае начальной ГЦК конфигурации формирование Ih модификации происходит либо на этапе предварительной термической релаксации, либо в ходе дальнейшего нагрева. При начальной аморфной морфологии характер структурных переходов претерпевает значительные изменения. Так, например, формирующаяся Ih модификация обладает большей стабильностью в области высоких температур и точка плавления нанокластеров смещается на величину более 100 К. Такой эффект обусловлен более плавным изменением удельной потенциальной энергии нанокластера в сравнении со случаем, когда устойчивая Ih конфигурация формируется при низких температурах. Полученные данные могут быть использованы при процессах создания нанокластеров серебра с требуемым внутренним строением. This article provides a comparative analysis of thermally induced structural transitions in silver nanoclusters with a change in their initial morphology. The study was executed by the molecular dynamics method using the modified TB-SMA (second moment approximation of tight-binding) tight binding potential. The number of atoms in nanoclusters corresponds to the icosahedral structure «magic» numbers. It is shown that for nanoclusters with the initial FCC configuration, the Ih modification is formed either at the stage of preliminary thermal relaxation or during further heating. For nanoclusters with an initial amorphous morphology, the nature of structural transitions undergoes significant changes. For example, the formed Ih modification is more stable at high temperatures and the melting point of nanoclusters shifts by more than 100 K. This effect is due to a smoother change in the specific potential energy of the nanocluster in comparison with the case when a stable Ih configuration is formed at low temperatures. The data obtained can be used in processes to create silver nanoclusters with the required internal structure.

scholarly journals Оценка влияния икосаэдрических "магических" чисел на термическую стабильность малых нанокластеров серебра

2022 ◽  
Vol 64 (3) ◽  
pp. 313
Author(s):  
Д.А. Рыжкова ◽  
С.Л. Гафнер ◽  
Ю.Я. Гафнер
Keyword(s):  
Tight Binding ◽  
Thermal Relaxation ◽  
Silver Nanoclusters ◽  
Binding Potential ◽  
Magic Numbers ◽  
Structural Transitions ◽  
Icosahedral Structure ◽  
Thermally Induced ◽  
Fcc Phase ◽  
Dynamics Method

A comparative analysis of thermally induced structural transitions in silver nanoclusters, the number of atoms of which corresponded to the “magic” numbers of the icosahedral (Ih) structure with variation of their initial morphology, was carried out by the molecular dynamics method using the modified tight-binding potential TB-SMA. It is shown that, in the case of the initial fcc phase, the formation of the Ih modification, depending on the particle size, occurred either at the stage of preliminary thermal relaxation or during further heating. At the initial amorphous morphology, the nature of the structural transitions underwent significant changes. Thus, even in the case of Ag55 clusters, the icosahedral structure was formed only in 50-60% of the experiments performed. Based on the data obtained, it was concluded that to create a stable Ih structure, it is necessary to use the thermal cycling procedure.

Thermally induced structural transitions from fluids to hydrogels with pH-switchable anionic wormlike micelles

2013 ◽  
Vol 394 ◽  
pp. 319-328 ◽  
Author(s):  
Yongmin Zhang ◽  
Yixiu Han ◽  
Zonglin Chu ◽  
Shuai He ◽  
Jichao Zhang ◽  
...  
Keyword(s):  
Wormlike Micelles ◽  
Structural Transitions ◽  
Thermally Induced

Effect of Thermally Induced Structural Transitions on the Ultra-Violet Fluorescence of Proteins

Nature ◽  
1962 ◽  
Vol 193 (4813) ◽  
pp. 375-376 ◽  
Author(s):  
R. F. STEINER ◽  
H. EDELHOCH
Keyword(s):  
Ultra Violet ◽  
Structural Transitions ◽  
Thermally Induced

Thermally Induced Structural Transitions in Cotton Fiber Revealed by a Finite Mixture Model of Tenacity Distribution

2018 ◽  
Vol 6 (6) ◽  
pp. 7420-7431 ◽  
Author(s):  
Sunghyun Nam ◽  
Daniel A. Alhassan ◽  
Brian D. Condon ◽  
Alfred D. French ◽  
Zhe Ling
Keyword(s):  
Mixture Model ◽  
Cotton Fiber ◽  
Finite Mixture Model ◽  
Finite Mixture ◽  
Structural Transitions ◽  
Thermally Induced
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