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81.
82.
Frielinghaus X Brodeck M Holderer O Frielinghaus H 《Langmuir : the ACS journal of surfaces and colloids》2010,26(22):17444-17448
The structure and dynamics of poly(ethylene oxide) adsorbed on dispersed clay platelets are investigated by small-angle neutron scattering and neutron spin-echo spectroscopy. The intermediate scattering function has a mobile contribution described by the Zimm theory and an immobile contribution that is constant within the time window. The immobile fraction as a function of the scattering vector Q is described by a Lorentz function, from which a localization length is determined. The relaxation rates grow with polymer concentration in agreement with dielectric measurements but contrary to pure polymer gels. 相似文献
83.
84.
We have studied adsorption of CO on Fe3O4(1 1 1) films grown on a Pt(1 1 1) substrate by temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and high resolution electron energy loss spectroscopy (HREELS). Three adsorption states are observed, from which CO desorbs at ∼110, 180, and 230 K. CO adsorbed in these states exhibits stretching frequencies at ∼2115-2140, 2080 and 2207 cm−1, respectively. The adsorption results are discussed in terms of different structural models previously reported. We suggest that the Fe3O4(1 1 1) surface is terminated by 1/2 ML of iron, with an outermost 1/4 ML consisting of octahedral Fe2+ cations situated above an 1/4 ML of tetrahedral Fe3+ ions, in agreement with previous theoretical calculations. The most strongly bound CO is assigned to adsorption to Fe3+ cations present on the step edges. 相似文献
85.
Dr. F. Henrich 《Monatshefte für Chemie / Chemical Monthly》1897,18(1):142-188
Ohne Zusammenfassung 相似文献
86.
87.
Chang-Kwon Kim Lauren R. H. Krumpe Emily Smith Curtis J. Henrich Isaac Brownell Karen L. Wendt Robert H. Cichewicz Barry R. OKeefe Kirk R. Gustafson 《Molecules (Basel, Switzerland)》2021,26(12)
A new 11 amino acid linear peptide named roseabol A (1) and the known compound 13-oxo-trans-9,10-epoxy-11(E)-octadecenoic acid (2) were isolated from the fungus Clonostachys rosea. Combined NMR and MS analysis revealed that roseabol A (1) contained amino acid residues characteristic of the peptaibol family of peptides such as isovaline, α-aminoisobutyric acid, hydroxyproline, leucinol, and an N-terminal isovaleric acid moiety. The amino acid sequence was established by a combination of NMR studies and tandem MS fragmentation analyses, and the absolute configurations of the constituent amino acids of 1 were determined by the advanced Marfey’s method. Compound 2 showed inhibitory activity against Merkel cell carcinoma, a rare and difficult-to-treat type of skin cancer, with an IC50 value of 16.5 μM. 相似文献
88.
C. Reichard F. Henrich F. Pregl A. Schoeller E. Appelt W. Hoffmeister F. Emich Sartorius-Werke F. Holtz W. H. F. Kuhlmann und O. Dafert 《Fresenius' Journal of Analytical Chemistry》1926,69(10):395-400
Ohne Zusammenfassung 相似文献
89.
The excited electronic states in the ionic crystal MgO have been studied by electron energy-loss spectroscopy. Structure observed above the thresholds for excitation from the Mg 2p, 2s and 1s core levels shows the final states to be predominantly excitonic levels of the Mg2+ ion. Comparison with the known states of the Mg2+ free ion indicates that solid-state shifts and splittings are small. 相似文献
90.
Henrich A Hoffmann P Ortner HM Greve T Itzel H 《Fresenius' Journal of Analytical Chemistry》2000,368(2-3):130-138
Chemicals from customers' returns have to be analyzed before they can be reused as raw materials in production. A procedure for non-invasive qualitative analysis of compounds in a closed container based on energy dispersive X-ray fluorescence (EDXRF) spectrometry is described. EDXRF was chosen as method for noninvasive analysis of chemicals through PE bottle walls without opening the bottle. This analysis aims for a quick proof of correspondence between the declaration of a reagent on the label of the bottle and its content. This analytical result cannot be achieved by a mere evaluation of characteristic element lines in EDXRF-spectra in combination with the method of matrix correction or the method of mean atomic number. These methods take into account only a small part of the total information available in an X-ray spectrum. It is shown here that valuable additional information is extractable from the spectral ranges of the Compton-scattering and Rayleigh-scattering areas by the use of methods of multivariate data analysis, especially by principle component analysis (PCA). Regularized discriminant analysis (RDA) was employed to establish a classification scheme for unknown samples. 相似文献