Phase Transition of a Single Sheet of Sashlike Polydiacetylene Atomic Sash on a Solid Surface

2004 ◽  
Vol 126 (32) ◽  
pp. 9894-9895 ◽  
Author(s):  
Osamu Endo ◽  
Hiroaki Ootsubo ◽  
Naoya Toda ◽  
Masanori Suhara ◽  
Hiroyuki Ozaki ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid Surface ◽  
Single Sheet

Single Sheet of a Quasi-Planar Macromolecule Prepared by Photopolymerization at a Solid Surface

1995 ◽  
Vol 117 (20) ◽  
pp. 5596-5597 ◽  
Author(s):  
Hiroyuki Ozaki ◽  
Tsutomu Funaki ◽  
Yasuhiro Mazaki ◽  
Shigeru Masuda ◽  
Yoshiya Harada
Keyword(s):  
Solid Surface ◽  
Single Sheet

scholarly journals Formation and Phase Transition of a Single Sheet of Sashlike Polydiacetylene -Atomic sash-

2005 ◽  
Vol 3 ◽  
pp. 470-472 ◽  
Author(s):  
Osamu Endo ◽  
Masanori Suhara ◽  
Hiroyuki Ozaki ◽  
Yasuhiro Mazaki
Keyword(s):  
Phase Transition ◽  
Single Sheet

Microstructure of laser-irradiated, conducting Kapton polyimide

1995 ◽  
Vol 53 ◽  
pp. 502-503
Author(s):  
D. L. Callahan ◽  
Z. Ball ◽  
H. M. Phillips ◽  
R. Sauerbrey
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
Cross Section ◽  
Film Surface ◽  
Cross Sectional ◽  
General Utility ◽  
Transmission Electron ◽  
Considerable Debate ◽  
Potential Applications

Ultraviolet laser-irradiation can be used to induce an insulator-to-conductor phase transition on the surface of Kapton polyimide. Such structures have potential applications as resistors or conductors for VLSI applications as well as general utility electrodes. Although the percolative nature of the phase transformation has been well-established, there has been little definitive work on the mechanism or extent of transformation. In particular, there has been considerable debate about whether or not the transition is primarily photothermal in nature, as we propose, or photochemical. In this study, cross-sectional optical microscopy and transmission electron microscopy are utilized to characterize the nature of microstructural changes associated with the laser-induced pyrolysis of polyimide.Laser-modified polyimide samples initially 12 μm thick were prepared in cross-section by standard ultramicrotomy. Resulting contraction in parallel to the film surface has led to distortions in apparent magnification. The scale bars shown are calibrated for the direction normal to the film surface only.

The structure of membranes and membrane proteins embedded in amorphous ice

1992 ◽  
Vol 50 (1) ◽  
pp. 432-433
Author(s):  
Uwe Lücken ◽  
Joachim Jäger
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Membrane Proteins ◽  
Phase Transition Temperature ◽  
Lipid Vesicles ◽  
Freezing Stress ◽  
Amorphous Ice ◽  
Different Temperatures ◽  
Band Pass ◽  
Lipid Polymorphism

TEM imaging of frozen-hydrated lipid vesicles has been done by several groups Thermotrophic and lyotrophic polymorphism has been reported. By using image processing, computer simulation and tilt experiments, we tried to learn about the influence of freezing-stress and defocus artifacts on the lipid polymorphism and fine structure of the bilayer profile. We show integrated membrane proteins do modulate the bilayer structure and the morphology of the vesicles.Phase transitions of DMPC vesicles were visualized after freezing under equilibrium conditions at different temperatures in a controlled-environment vitrification system. Below the main phase transition temperature of 24°C (Fig. 1), vesicles show a facetted appearance due to the quasicrystalline areas. A gradual increase in temperature leads to melting processes with different morphology in the bilayer profile. Far above the phase transition temperature the bilayer profile is still present. In the band-pass-filtered images (Fig. 2) no significant change in the width of the bilayer profile is visible.

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