scholarly journals In situ TEM observation of phase transition of the nanoscopic patterns on baroplastic block copolymer films during nanoindentation

Nanoscale ◽  
2013 ◽  
Vol 5 (10) ◽  
pp. 4351 ◽  
Author(s):  
Ara Jo ◽  
Gil Ho Gu ◽  
Hong Chul Moon ◽  
Sung Hyun Han ◽  
Sang Ho Oh ◽  
...  
Keyword(s):  
Phase Transition ◽  
Block Copolymer ◽  
In Situ Tem ◽  
Copolymer Films

In situ TEM and half cell investigation of sodium storage in hexagonal FeSe nanoparticles

2019 ◽  
Vol 55 (39) ◽  
pp. 5611-5614 ◽  
Author(s):  
Kai Wu ◽  
Fei Chen ◽  
Zhongtao Ma ◽  
Bingkun Guo ◽  
Yingchun Lyu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrochemical Performance ◽  
Tetragonal Phase ◽  
Sodium Ion ◽  
In Situ Tem ◽  
Sodium Ion Batteries ◽  
Half Cell ◽  
Sodium Storage

A hexagonal FeSe anode for sodium-ion batteries shows desirable electrochemical performance with an irreversible phase transition from the hexagonal to tetragonal phase.

In situ TEM observing structural transitions of MoS2upon sodium insertion and extraction

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 96035-96038 ◽  
Author(s):  
Liqiang Zhang ◽  
Yushu Tang ◽  
Yuecun Wang ◽  
Yongli Duan ◽  
Degang Xie ◽  
...  
Keyword(s):  
Phase Transition ◽  
In Situ Tem ◽  
Structural Transitions ◽  
Na Ions

The sodiation and desodiation process of MoS2was characterized by in situ TEM technique. The structural evolutions of MoS2, especially its phase transition from 2H to 1T-MoS2and the occupancy of the Na ions during the intercalation are recognized.

Phase Transitions in Thin Block Copolymer Films

MRS Bulletin ◽  
2010 ◽  
Vol 35 (6) ◽  
pp. 457-465 ◽  
Author(s):  
Edward J. Kramer
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Block Copolymer ◽  
Diblock Copolymer ◽  
Smectic Liquid Crystals ◽  
Material System ◽  
Thermal Generation ◽  
Copolymer Films ◽  
Bcc Structure ◽  
Line Defects

AbstractDavid Turnbull's experiments and theoretical insights paved the way for much of our modern understanding of phase transitions in materials. In recognition of his contributions, this lecture will concentrate on phase transitions in a material system not considered by Turnbull, thin diblock copolymer films. Well-ordered block copolymer films are attracting increasing interest as we attempt to extend photolithography to smaller dimensions. In the case of diblock copolymer spheres, an ordered monolayer is hexagonal, but the ordered bulk is body-centered cubic (bcc). There is no hexagonal plane in the bcc structure, so a phase transition must occur as n, the number of layers of spheres in the film, increases. How this phase transition occurs with nand how it can be manipulated is the subject of the first part of my presentation. In the second part of the talk, I show that monolayers of diblock copolymer spheres and cylinders undergo order-to-disorder transitions that differ greatly from those of the bulk. These ordered 2D monolayers are susceptible to phonon-generated disorder as well as to thermal generation of defects, such as dislocations, which, while they are line defects in 3D, are point defects in 2D. The results are compared to the theories of melting of 2D crystals (spheres) and of 2D smectic liquid crystals (cylinders), a comparison that will allow us to understand most, but not all, of the features of these order-disorder transitions that occur as the temperature is increased.

Dynamic photoinduced realignment processes in photoresponsive block copolymer films: effects of the chain length and block copolymer architecture

Soft Matter ◽  
2015 ◽  
Vol 11 (29) ◽  
pp. 5918-5925 ◽  
Author(s):  
Masami Sano ◽  
Feng Shan ◽  
Mitsuo Hara ◽  
Shusaku Nagano ◽  
Yuya Shinohara ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Chain Length ◽  
Liquid Crystalline ◽  
Polymer Architecture ◽  
Copolymer Films

The realignment process of microphase separated cylinder structure in azobenezene-containing liquid crystalline block copolymer films was significantly affected by the polymer architecture as revealed by in situ synchrotron GI-SAXS measurements.

scholarly journals In-Situ Reflectometry Observation on Structural Changes of Thin Self-Assembled Block Copolymer Films

2007 ◽  
Vol 83 ◽  
pp. 012028 ◽  
Author(s):  
N Torikai ◽  
N L Yamada ◽  
D Kawaguchi ◽  
A Takano ◽  
Y Matsushita ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Structural Changes ◽  
Copolymer Films ◽  
Self Assembled

In Situ Tracking of Microstructure Spacing and Ordered Domain Compression during the Drying of Solution-Cast Block Copolymer Films Using Small-Angle X-ray Scattering

2012 ◽  
Vol 45 (8) ◽  
pp. 3480-3486 ◽  
Author(s):  
Michael J. Heinzer ◽  
Sangil Han ◽  
John A. Pople ◽  
Donald G. Baird ◽  
Stephen M. Martin
Keyword(s):  
Block Copolymer ◽  
Small Angle ◽  
X Ray ◽  
Copolymer Films ◽  
X Ray Scattering ◽  
Solution Cast ◽  
Ray Scattering

In-situ Characterization of Switching Mechanism in Phase Change Random Access Memory (PRAM) Using Transmission Electron Microscopy (TEM)

2013 ◽  
Author(s):  
Sungkyu Son ◽  
Seungjoon Jeon ◽  
Jangwon Oh ◽  
Won Kim ◽  
Hojoung Kim ◽  
...  
Keyword(s):  
Phase Transition ◽  
Failure Analysis ◽  
Phase Change ◽  
Void Formation ◽  
Amorphous State ◽  
Random Access ◽  
Switching Behavior ◽  
In Situ Tem ◽  
Switching Mechanism

Abstract It is important to understand the switching mechanism of phase change material for failure analysis of PRAM device. In this study, the real time observations of phase transition and void formation mechanism of confined GST structure were investigated using in-situ TEM with multi-pulse AC biasing technique. In-situ SET switching behavior between amorphous state and crystalline state with continuous structural change was successfully observed. Volume shrink of GST, due to the phase transition, induced voids at grain boundary of crystalline phase. Excess Joule-heating after crystallization caused coalescence and migration of voids. These results may give us a crucial clue for endurance failure analysis of PRAM.

scholarly journals Use of in situ TEM experiments for phase transition studies

1993 ◽  
Vol 4 (2-3) ◽  
pp. 249-264 ◽  
Author(s):  
E. Snoeck ◽  
C. Roucau ◽  
P. Baules ◽  
M.J. Casanove ◽  
M. Fagot ◽  
...  
Keyword(s):  
Phase Transition ◽  
In Situ Tem ◽  
Transition Studies
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