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101.
102.
Ratikanta Mishra Dr. Wilfried Hermes Ute Ch. Rodewald Rolf‐Dieter Hoffmann Rainer Pöttgen Prof. Dr. 《无机化学与普通化学杂志》2008,634(3):470-474
The new intermetallic cerium compound Ce2RuZn4 was synthesized from the elements in a sealed tantalum tube in a water‐cooled sample chamber of an induction furnace. Ce2RuZn4 crystallizes with a new structure type: P4/nmm, Z = 2, a = 719.6(1), c = 520.2(1) pm, wR2 = 0.0816, 273 F2 values and 15 variables. The structure contains two crystallographically independent cerium atoms: Ce1 with CN 16 (12 Zn + 4 Ce) and Ce2 with CN 14 (2 Ru + 8 Zn + 4 Ce). Based on the interatomic distances the two sites can be assigned to trivalent Ce1 and intermediate valent Ce2. The trivalent‐intermediate valent cerium ordering is underlined by magnetic susceptibility measurements. Ce2RuZn4 shows modified Curie‐Weiss behaviour in the temperature range 10–290 K with an experimental magnetic moment of 2.57(1) μB per formula unit. Thus only half of the cerium atoms are trivalent in Ce2RuZn4. A remarkable feature of the Ce2RuZn4 structure are short Ce2–Ru distances of 260 pm. The crystal chemistry of Ce2RuZn4 is discussed. 相似文献
103.
104.
Guillermo Orts Gil Sylvain Prévost Magdalena Łosik Florian Hermes Helmut Schlaad Thomas Hellweg 《Colloid and polymer science》2009,287(11):1295-1304
The self-assembly of polystyrene-block-poly(l-lysine) (PS-PLLys·HCl) copolymers with different block lengths has been studied in toluene. The obtained spherical micelles exhibit size variations upon addition of acids or bases, as indicated by light and neutron scattering studies. It is shown that pyridine induces a shrinking of the polystyrene chains in the corona region of the micelles, decreasing the aggregate solvent interface. The addition of benzoic acid, on the other hand, leads to a swelling of the copolymer micelles proportional to the molar fraction of polypeptide. This behavior suggests a selective permeability of the PS-PLLys micelles and the possibility to encapsulate organic compounds in toluene depending on their chemical nature. 相似文献
105.
This Letter describes an efficient three-step synthesis route of symmetric and asymmetric phenyl-substituted photochromic 1,2-dithienylethenes bearing unprotected functional groups (i.e., alcohols, carboxylic acids or amines). These products can be easily obtained by typical Suzuki cross-coupling between photochromic dichlorides and commercial available boronic acids or pinacol esters. 相似文献
106.
Abegg R Baldisseri A Boudard A Briscoe W Fabbro B Garçon M Hermes EA Jacobs WW Kessler RS Lytkin L Mayer B Nefkens BM Niebuhr C Petrov AM Poitou J Saudinos J Tippens B Tomasi-Gustafsson E van der Schaaf A van Oers WT Vigdor SE Wang M White D 《Physical review D: Particles and fields》1994,50(1):92-103
107.
Pedro Henrique Hermes Araújo Jos Carlos de la Cal Jos Maria Asua Jos Carlos Pinto 《Macromolecular theory and simulations》2001,10(8):769-779
A detailed dynamic mathematical model that describes the evolution of particle size distributions (PSDs) during emulsion copolymerization reactions in a continuous loop reactor was developed and compared with experimental data. The model is based on the assumption that two distinct particle populations exist: precursor particles and stable latex particles. Precursor particles are colloidally unstable and therefore may undergo coagulation with other precursors and be absorbed by stable latex particles. It is shown that the kinetic model is able to reproduce the rather complex dynamic behavior of the vinyl acetate/Veova10 emulsion copolymerization in a continuous loop reactor, including the development of oscillatory responses of PSDs during reaction start‐up. It is also shown that, for the studied polymerization system, oscillatory responses are obtained only when both particle populations are assumed to exist and when both coagulative and micellar particle nucleations are simultaneously considered. 相似文献
108.
H. Winkler A. Sawaryn A. X. Trautwein A. S. Yousif C. Hermes H. Toftlund R. H. Herber 《Hyperfine Interactions》1988,42(1-4):921-924
We have used temperature dependent magnetic susceptibility, Mössbauer and EXAFS measurements to study the high spin (HS) — low spin (LS) conversion in Fe(II) (bptn) (NCS)2, and we have combined consistently the information obtained from the different methods. 相似文献
109.
110.
SINDRUM Collaboration W. Bertl R. Eichler L. Felawka H. K. Walter
G. Bowden
S. Egli R. Engfer Ch. Grab E. A. Hermes D. Herter P. Heusi N. Kraus R. J. Powers H. S. Pruys A. v.d. SchaafJ. J. Domingo
J. Jansen N. Lordong J. MergaertJ. Martino
《Physics letters. [Part B]》1984,140(5-6):299-303A search for the decay μ+→e+e+e−, in which no candidate was found, yields a new upper limit for the branching ratio Rμ→3e<1.6×10−10 (90% confidence). A total of 16
decays were observed, in agreement both in number and momentum distribution with V - A theory. 相似文献