scholarly journals New Fluorescent, Thermally Stable and Film Forming Polyimines Containing Naphthyl Rings

2019 ◽  
pp. 899-912 ◽  
Author(s):  
Farah Qureshi ◽  
Muhammad Yar Khuhawar ◽  
Taj Muhammad Jahangir
Keyword(s):  
Thermally Stable ◽  
Film Forming

Synthesis, physical and electroluminescence properties of 3,6-dipyrenylcarbazole end capped oligofluorenes

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 26569-26579 ◽  
Author(s):  
Tidaratana Sangchart ◽  
Arunroj Niroram ◽  
Teadkait Kaewpuang ◽  
Narid Prachumrak ◽  
Supawadee Namuangruk ◽  
...  
Keyword(s):  
Blue Emission ◽  
Device Performance ◽  
Thermally Stable ◽  
Good Solubility ◽  
Film Forming ◽  
Strong Blue Emission

A series of oligofluorenes bearing 3,6-dipyrenylcarbazoles as the terminal substituents showed strong blue emission with good solubility, and thermally stable amorphous and excellent film-forming properties. OLEDs using these materials exhibited excellent device performance.

The Effect of the Substitution Position of Nitrogen Atoms on Copolyimide Properties

2014 ◽  
Vol 1079-1080 ◽  
pp. 66-69
Author(s):  
Yu Han Li ◽  
Ri Zhe Jin
Keyword(s):  
Mechanical Properties ◽  
Water Uptake ◽  
Water Stability ◽  
Side Chains ◽  
Thermally Stable ◽  
Dimensional Changes ◽  
Film Forming ◽  
Diamine Monomer

Two containing nitrogen diamine monomer, 2-(4-aminophenyl)-5-aminopyrimidine (PAPRM) and 2,5-two(dimethyl amino methylene)-1,4-((paraamino) phenyl)benzene(DMAPB), was synthesized. The corresponding copolyimide containing 40–80 mol % PAPRM and DMAPB were prepared. The copolymers showed excellent solubility and good film-forming capability. Most of the SPI membranes were both tough and flexible and thermally stable up to 330 °C.With increasing content of the nitrogen atoms, water uptake of membranes and dimensional changes also remarkable decrease. Compared with the main chains containing nitrogen atoms, the side chains type displayed excellent water stability and good mechanical properties.

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

A Freeze Shadow Technique for the Preparation of Soft Paint Latexes for Electron Microscopy

1977 ◽  
Vol 35 ◽  
pp. 314-315
Author(s):  
Earl R. Walter ◽  
Glen H. Bryant
Keyword(s):  
Sample Preparation ◽  
High Vacuum ◽  
Vacuum System ◽  
Latex Particles ◽  
New Methods ◽  
Diffusion Pump ◽  
Film Forming ◽  
Routine Basis ◽  
Distribution Studies ◽  
Preparation Techniques

With the development of soft, film forming latexes for use in paints and other coatings applications, it became desirable to develop new methods of sample preparation for latex particle size distribution studies with the electron microscope. Conventional latex sample preparation techniques were inadequate due to the pronounced tendency of these new soft latex particles to distort, flatten and fuse on the substrate when they dried. In order to avoid these complications and obtain electron micrographs of undistorted latex particles of soft resins, a freeze-dry, cold shadowing technique was developed. The method has now been used in our laboratory on a routine basis for several years.The cold shadowing is done in a specially constructed vacuum system, having a conventional mechanical fore pump and oil diffusion pump supplying vacuum. The system incorporates bellows type high vacuum valves to permit a prepump cycle and opening of the shadowing chamber without shutting down the oil diffusion pump. A baffeled sorption trap isolates the shadowing chamber from the pumps.

Investigation of the V4+-Centre in 6H- and 4H-SIC by the Method of Spectral-Hole Burning

1998 ◽  
Vol 512 ◽  
Author(s):  
C. Hecht ◽  
R. Kummer ◽  
A. Winnacker
Keyword(s):  
Electronic Properties ◽  
Room Temperature ◽  
Hole Burning ◽  
Band Offset ◽  
Spectral Hole Burning ◽  
Type Ii ◽  
Thermally Stable ◽  
Spectral Hole

ABSTRACTIn the context of spectral-hole burning experiments in 4H- and 6H-SiC doped with vanadium the energy positions of the V4+/5+ level in both polytypes were determined in order to resolve discrepancies in literature. From these numbers the band offset of 6H/4H-SiC is calculated by using the Langer-Heinrich rule, and found to be of staggered type II. Furthermore the experiments show that thermally stable electronic traps exist in both polytypes at room temperature and considerably above, which may result in longtime transient shifts of electronic properties.

Modern devices for treatment of the surgeon’s hands and the surgical field (literature review)

2020 ◽  
pp. 41-50
Author(s):  
Artem Mikhailovich Morozov ◽  
◽  
Alexey Nikolaevich Sergeev ◽  
Gennady Alexandrovich Dubatolov ◽  
Nikolay Alexandrovich Sergeev ◽  
...  
Keyword(s):  
Cost Effective ◽  
Surgical Infection ◽  
Operating Field ◽  
Functional Additives ◽  
Literary Sources ◽  
Film Forming ◽  
Key Points ◽  
Surgical Field ◽  
Ammonium Compounds ◽  
Active Substances

The aim – analyze modern Russian and foreign literary sources in order to determine modern means for treating the hands of the surgeon and the operating field. Results. One of the key points in the prevention of surgical infection is the treatment of the surgeon’s hands and the operating field with effective skin antiseptics in order to destroy pathogenic and opportunistic microorganisms that colonize intact skin. In modern practice, skin antiseptics are predominantly used containing alcohols as active substances, in particular ethyl, propyl and isopropyl, halogenated substances such as iodine and iodophores, guanidines, which include chlorhexidine digluconate, as well as quaternary ammonium compounds. Moreover, the most widespread are combined preparations containing several active substances and functional additives, which makes it possible to neutralize the negative properties of various active substances. Also, an interesting and promising direction is the use of polymer operating films or film-forming antiseptics. Currently, research is being actively carried out aimed at finding and developing modern highly effective antiseptic agents and their rational combinations that meet the necessary requirements, are optimal in their properties, cost-effective and comfortable to use.

Effect of plant film-forming anti-transpirant on transpiration efficiency of winter wheat flag-leaf

2012 ◽  
Vol 19 (5) ◽  
pp. 1091-1095
Author(s):  
Chang-Hai SHI ◽  
Shao-Hua KONG ◽  
Hong-Mei ZHAI ◽  
Jing YANG ◽  
Dong-Xiao LI ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Flag Leaf ◽  
Transpiration Efficiency ◽  
Film Forming

Advanced Thermally Stable Jet Fuels Development Program Annual Report. Volume 1. Model and Experiment System Development

1990 ◽  
Author(s):  
Elmer Klavetter ◽  
Tim O'Hern ◽  
Bill Marshall ◽  
Merrill Jr. ◽  
Frye Ray ◽  
...  
Keyword(s):  
Annual Report ◽  
System Development ◽  
Development Program ◽  
Jet Fuels ◽  
Thermally Stable ◽  
Experiment System
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