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131.
132.
133.
F. Fujara B. Geil H. Sillescu G. Fleischer 《Zeitschrift für Physik B Condensed Matter》1992,88(2):195-204
Self diffusion coefficients in supercooled orthoterphenyl (OTP) have been determined down toD
t
=3·10–14 m2s–1 using a1H-NMR technique applying static field gradients up to 53T m–1 In a range of more than two decades theD
t
values agree with those of photochromic tracer molecules of the same size determined by forced Rayleigh scattering down to the glass transition temperatureT
g
. A change of mechanism is found for translational diffusion atT
c
1.2T
g
whereD
t
is proportional to the inverse shear viscosity
–1 atT>T
c
butD
t
with =0.75 atT<T
c
. Rotational correlation times determined by2H-NMR stimulated echo techniques in deuterated OTP remain proportinal to
–1 down toT
g
. Our results are discussed in relation with mode coupling theory and with models of cooperative motion at the glass transition. 相似文献
134.
M. Fleischer J. Giber H. Meixner 《Applied Physics A: Materials Science & Processing》1992,54(6):560-566
H2-induced changes of electrical conductivity in polycrystalline, undoped -Ga2O3 thin films in the temperature range of 400–650° C are described. The sheet conductance of these films depends reversibly, according to a power law p
1/3, on the partial pressure of hydrogen in the ambient atmosphere of the Ga2O3 film. A bulk vacancy mechanism is excluded by experiments and it is shown that the interaction is based on a surface effect. Changes in conductance are discussed to result from the formation of an accumulation layer due to chemisorption on the grain surfaces. Typical coverages are determined to be approximately 10–4 ML for pH2=0.05 bar and T=600° C. A possible explanation of the p
1/3 power law is provided. 相似文献
135.
Jola Pospech Dr. Ivana Fleischer Prof. Dr. Robert Franke Prof. Dr. Stefan Buchholz Prof. Dr. Matthias Beller 《Angewandte Chemie (International ed. in English)》2013,52(10):2852-2872
Transition‐metal‐catalyzed hydroformylation reactions constitute one of the most powerful tools for C? C bond formation in organic synthesis and represent an outstanding example of the application of homogeneous catalysis on an industrial scale. This process allows for the straightforward conversion of inexpensive chemical feedstock into broadly applicable aldehydes, which serve as major building blocks for numerous chemical products. These products are highly valuable for the chemical industry and used as plasticizers, detergents, and surfactants on a million ton scale. Moreover, aldehydes serve as versatile chemical intermediates for the production of fine chemicals and pharmaceuticals. Currently, most of the bulk hydroformylation processes rely on rhodium‐based catalysts. The increasing demand and resulting high cost of this precious metal has resulted in alternative transition‐metal catalysts becoming highly desirable. The following Review summarizes the progress achieved utilizing Ru, Ir, Pd, Pt, and Fe catalysts in hydroformylation reactions. 相似文献
136.
W. R. Kirner H. I. Coombs L. W. Winkler H. C. Fleischer H. Merten R. Kuhn H. Roth R. C. Smith H. C. Howard und K. Iwamoto 《Fresenius' Journal of Analytical Chemistry》1937,110(1-2):75-77
Ohne Zusammenfassung 相似文献
137.
138.
E. Fleischer und Ed. Donath 《Fresenius' Journal of Analytical Chemistry》1883,22(1):246-247
Ohne Zusammenfassung 相似文献
139.
140.