Nature of the Diffusion Process in Rubber

1937 ◽  
Vol 10 (4) ◽  
pp. 673-674 ◽  
Author(s):  
Richard M. Barrer
Keyword(s):  
Diffusion Process ◽  
Temperature Coefficient ◽  
Gas Diffusion ◽  
Diffusion System ◽  
Large Temperature ◽  
Molecular Weights ◽  
Diffusion Systems ◽  
Diffusion Of Gases

Abstract It is known that silica-gas diffusion systems exemplify a type of non-specific activated diffusion process, as opposed to the specific type of diffusion system, such as hydrogen-palladium. It seemed that the diffusion of gases through other “glass-like” materials such as some organic membranes, for example rubber, might offer further examples of non-specific activated diffusion. The data needed to test this hypothesis were available in papers by Edwards and Pickering, and by Dewar. Graham first noted the large temperature coefficient of the diffusion process through rubber, and that the diffusion velocities had no connection with the molecular weights.

scholarly journals PHOTOCHEMISTRY OF VISUAL PURPLE

1921 ◽  
Vol 3 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Selig Hecht
Keyword(s):  
Diffusion Process ◽  
Temperature Coefficient ◽  
Chemical Process

The temperature coefficient of the bleaching of visual purple by light is 1.00 over a range of 30 degrees. This indicates that the monomolecular course of the reaction represents a real chemical process, as opposed to a possible diffusion process, and that the reaction is probably simple in nature.

Large Temperature Coefficient of Resistance in La0.7Ca0.3MnO3Thin Films Obtained by Metal Organic Deposition Process

2004 ◽  
Vol 43 (No. 8B) ◽  
pp. L1054-L1056 ◽  
Author(s):  
Kais Daoudi ◽  
Tetsuo Tsuchiya ◽  
Susumu Mizuta ◽  
Iwao Yamaguchi ◽  
Takaaki Manabe ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Deposition Process ◽  
Large Temperature ◽  
Temperature Coefficient Of Resistance ◽  
Metal Organic ◽  
Metal Organic Deposition

Large temperature coefficient of resistance in atomically thin two-dimensional semiconductors

2020 ◽  
Vol 116 (20) ◽  
pp. 203105 ◽  
Author(s):  
Asir Intisar Khan ◽  
Pedram Khakbaz ◽  
Kevin A. Brenner ◽  
Kirby K. H. Smithe ◽  
Michal J. Mleczko ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Large Temperature ◽  
Two Dimensional ◽  
Temperature Coefficient Of Resistance

Gas Diffusion and Re-Diffusion in Polyethylene Foams

2009 ◽  
Vol 283-286 ◽  
pp. 583-588
Author(s):  
J. Escudero ◽  
J. Lázaro ◽  
E. Solórzano ◽  
Miguel A. Rodríguez-Pérez ◽  
Jose A. de Saja
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Process ◽  
Static Loading ◽  
Effective Diffusion Coefficient ◽  
Effective Diffusion ◽  
Gas Diffusion ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Compressive Creep ◽  
Closed Cell

In this work, the effective diffusion coefficient of the gas contained in closed cell polyethylene foams under static loading is measured. To do this, compressive creep experiments were performed on low density polyethylene foams produced under a gas diffusion process. Density dependence of this coefficient has been analysed as well as the variation of pressure with time inside the cells. Finally, immediately after compressive creep, the recovery behaviour of the foams was also characterised. Different abilities for recovering were observed depending on the density of the foam and the absolute recovery resulted independent of the initial stress applied.

scholarly journals Graphite on paper as material for sensitive thermoresistive sensors

2015 ◽  
Vol 3 (34) ◽  
pp. 8776-8779 ◽  
Author(s):  
Toan Dinh ◽  
Hoang-Phuong Phan ◽  
Dzung Viet Dao ◽  
Peter Woodfield ◽  
Afzaal Qamar ◽  
...  
Keyword(s):  
Temperature Coefficient ◽  
Low Cost ◽  
Large Temperature ◽  
Temperature Coefficient Of Resistance ◽  
Highly Sensitive

We report on the thermoresistive properties of graphite on paper (GOP). A large temperature coefficient of resistance was observed and a highly sensitive GOP-based anemometer was demonstrated, indicating strong feasibility of using the GOP for low-cost thermoresistive sensors.

ABRAHAMS–TSUNETO REACTION–DIFFUSION SYSTEM IN SUPERCONDUCTIVITY AND SYMBOLIC COMPUTATION

2001 ◽  
Vol 12 (10) ◽  
pp. 1417-1423 ◽  
Author(s):  
YI-TIAN GAO ◽  
BO TIAN ◽  
GUANG-MEI WEI
Keyword(s):  
Symbolic Computation ◽  
Reaction Diffusion ◽  
Analytic Solutions ◽  
Reaction Diffusion System ◽  
Diffusion System ◽  
Ginzburg Landau ◽  
Reaction Diffusion Systems ◽  
Diffusion Systems ◽  
Exact Analytic Solutions ◽  
Self Consistent

The reaction–diffusion systems represent various problems in the real world. For the Abrahams–Tsuneto reaction–diffusion system arising in superconductivity, we perform computerized symbolic computation and find its new exact analytic solutions, which are solitonic. We see the possibility that by way of the shock waves, the self–consistent superconducting interaction drives the Ginzburg–Landau order parameter, which might be observable.

Design and control of gas diffusion process in a nanoporous soft crystal

Science ◽  
2019 ◽  
Vol 363 (6425) ◽  
pp. 387-391 ◽  
Author(s):  
Cheng Gu ◽  
Nobuhiko Hosono ◽  
Jia-Jia Zheng ◽  
Yohei Sato ◽  
Shinpei Kusaka ◽  
...  
Keyword(s):  
Diffusion Process ◽  
Rational Design ◽  
Regulatory System ◽  
Gas Diffusion ◽  
Ambient Conditions ◽  
Guest Molecules ◽  
Flip Flop ◽  
Soft Crystal ◽  
And Control ◽  
And Storage

Design of the gas-diffusion process in a porous material is challenging because a contracted pore aperture is a prerequisite, whereas the channel traffic of guest molecules is regulated by the flexible and dynamic motions of nanochannels. Here, we present the rational design of a diffusion-regulatory system in a porous coordination polymer (PCP) in which flip-flop molecular motions within the framework structure provide kinetic gate functions that enable efficient gas separation and storage. The PCP shows substantial temperature-responsive adsorption in which the adsorbate molecules are differentiated by each gate-admission temperature, facilitating kinetics-based gas separations of oxygen/argon and ethylene/ethane with high selectivities of ~350 and ~75, respectively. Additionally, we demonstrate the long-lasting physical encapsulation of ethylene at ambient conditions, owing to strongly impeded diffusion in distinctive nanochannels.

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