Tetrafluoromethane effect

Fig. 3.1.11 Relative effective intracrystalline diffusivities D(t)/D0 as function of JDot for n-hexane under single-component adsorption (circles) and for n-hexane (triangles) and tetrafluoromethane (rectangles) under two-...

Harnisch, J R. Borchers, P. Fabian, H. W. Gaggeler, and U. Schot-terer, Effect of Natural Tetrafluoromethane, Nature, 384, 32 (1996b). 

Hamisch J, Borchers R, Fabian P, Gaggeler HW, Schotterer U (1996) Effect of Natural Tetrafluoromethane. Nature 384 32... 

R.E. Weston, Possible Greenhouse Effects of Tetrafluoromethane and Carbon Dioxide... from Aluminum Production, Atmos. Environ. (Oxford) 30(16), 29012-2910, Aug. (1996). 

Fig. 9 Relative effective diffusivities for n-hexane (A, sample 2) and tetrafluoromethane ( , sample 2) under two-component adsorption and for n-hexane under singlecomponent adsorption (o, sample 1). The lines represent the appropriate fits of Eqs. 15a,b, respectively. From [116] with permission...

The reaction between carbon monoxide and oxygen atoms produced by the thermal decomposition of ozone was studied in the range 80-160 C The chemiluminescence from 002( 82) was used to follow the course of the reaction. The effect of added carbon dioxide, tetrafluoromethane and oxygen on the kinetics and chemiluminescence was investigated. It is concluded that there are simultaneous bimolecular and third body channels for the reaction of CO with 0-atoms to produce electronically excited C02 ... 

Yip, J., Chan, K., Sin, K.M., Lau, K.S., 2002a. Study of physico-chemical surface treatments on dyeing properties of polyamides, part 1 effect of tetrafluoromethane low temperature plasma. Color. Technol. 118, 26-30. 

Recovery from a large input of atmospheric CO2 from burning fossil fuels will result in an effective lifetime of tens of thousands of years (Archer, 2005). Methane has an atmospheric lifetime of 12 to 15 years. The methane is degraded to water and CO2 by chemical reactions in the atmosphere. Nitrous oxide has an atmospheric lifetime of 120 years, while CFC-12 has an atmospheric lifetime of 100 years. HCFC-22 has an atmospheric lifetime of 12.1 years, and tetrafluoromethane has an atmospheric lifetime of 50,000 years. Sulfur hexafluoride has an atmospheric lifetime of 3200 years. 

For more profound textile surface modifications, gases such as tetrafluoromethane (CF4) are useful. Specifically, tetrafluoromethane will form a thin hydrophobic layer over textile fibers after use within a plasma discharge. There are a number of studies which indicate that ablation accompanies the deposition of these thin films on fiber surfaces. In reference [30], Yip et al. suggested that shorter CF4 plasma exposure time will lead to more efficient polymerization effects, whereby longer CF4 plasma exposures lead to better surface ablation and lowered surface tension. 

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