Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We offer an alternative explanation of the breakdown of Debye−Stokes−Einstein and Stokes−Einstein relations observed as enhanced translational diffusion compared with rotational diffusion of probe molecules in supercooled liquids and polymers close to the glass transition temperature. By showing that the breakdowns of…
A systematic investigation into the effects of deposition conditions on the electrochemical properties and nanostructure of high surface area (up to ∼460 m 2 cm - 3 ) mesoporous platinum films (H I -ePt) obtained by electroreduction of hexachloroplatinic acid (HCPA) from an hexagonal lyotropic liquid crystalline phase…
The photochemistry of the (7-methoxycoumarin-4-yl)methyl (MCM) carboxylates 3a − d, the mesylate 4, and the phosphates 5a − e has been examined under near physiological conditions in acetonitrile or methanol/aqueous HEPES buffer solution, respectively. Analysis of photoproducts as well as measurements of photochemical…
Models are presented which show that, for WDM systems, XPM and FWM in EDFAs can be far larger for tellurite than for silica (tens of dB larger for FWM), because tellurite is highly nonlinear. Experimental results for XPM are presented.
In this work we present the results of molecular dynamics simulations of polypropylene melts of different tacticities, based on a recently published molecular model. Volumetric properties of isotactic, syndiotactic, and atactic polypropylene exhibit no significant differences and are in good agreement with experimenta…
Kinetic aspects of the synthesis of (2-methacryloxy)ethyloxy functionalized poly( l -lactide) macromonomers using aluminum mono- and trialkoxides carrying this functionality are presented. The results show the living character of the ring-opening polymerization independently of the reaction temperature, but there are…
"The book focuses on structural and property characterization of nanocrystals and their assemblies, with an emphasis on basic physical approach, detailed techniques, data interpretation and applications." "Intended as a comprehensive reference work for postgraduate students and researchers in the field who are special…
We introduce a new colloidal probe technique to study local and long range motions of semiflexible actin filaments along their reptation tube axis in entangled networks. Single test filaments decorated with colloidal gold and latex beads are embedded in semidilute actin networks. The chain diffusive motion is explored…
A neutron diffraction study of four rare-earth phosphate glasses of composition (R 2 O 3 ) x (P 2 O 5 ) 1- x , where x = 0.197, 0.235, 0.187, 0.263 and R = Ce, Ce, Nd, Tb respectively is presented. The structures of these materials were investigated as a function of (a) rare-earth atomic number and (b) composition. Th…
For s-polypropylene, three different s-poly(propene- co -octene)s, two poly(ethylene- co -octene)s and poly( -caprolactone) we determined the relationships between the crystallization temperature T c , the crystal thickness d c and the melting peak temperature T f by carrying out time- and temperature-dependent small-…
The manganates La 0.80 Ca 0.20 MnO 3 , La 0.70 Ca 0.30 MnO 3 and La 0.70 Sr 0.30 MnO 3 exhibit the colossal magnetoresistive (CMR) effect. Total neutron diffraction was employed to yield information on both the average and local atomic structure of these disordered crystalline materials as a function of temperature. T…
We quantify the relationship between the atomic structures of the amorphous and the ordered and disordered crystalline phases of silica using neutron total scattering measurements to determine the local atomic configurations. The instantaneous local atomic arrangements of HP-tridymite and -cristobalite, both dynamical…
Grand canonical Monte Carlo molecular simulations have been carried out for adsorption of nitrogen at 77 K on square arrays of open and closed single-wall carbon nanotubes with diameters of 6−30 Å and nanotube separations of 4−30 Å. Exohedral spaces for arrays of closed nanotubes with small tube separations are microp…
The samarium(II) aryloxide complexes Sm(OAr) 2 (THF) 3 and [(C 5 Me 5 )Sm(μ-OAr)] 2 (Ar = C 6 H 2 t Bu 2 -2,6-Me-4) showed an extremely high activity for the ring-opening polymerization of ε-caprolactone (CL) and δ-valerolactone (VL). By using Sm(OAr) 2 (THF) 3 as an initiator, polyesters with very high molecular weig…
Six disaccharide amphiphiles were synthesized and their hydrogel-forming behavior was extensively studied. These amphiphiles were based on maltose and lactose. Since the gels formed from some of these systems showed the ability to “trap” water molecules upon gelation, these gels were described as “hydrogels”. When the…
The structural and magnetic properties of Mn5Ge3Cx films prepared at elevated substrate temperatures TS are investigated. In particular, films with x >= 0.5 and TS = 680 K exhibit a strongly enhanced Curie temperature TC = 440 K compared to Mn5Ge3 with TC = 304 K. Structural analysis of these films suggests that the c…
A method is presented for generating quasiregular arrays of nanometer-sized noble metal and metal oxide clusters on flat substrates by the use of a polymer template. The approach is of general applicability to other metals and various oxides. In the first step, polymeric micelles with a polar core were generated by di…
Results are presented of a detailed x-ray diffraction, Raman and thermal analysis study of the structural phase transitions in LiNH 4 SO 4 carried out in the temperature range 298-600 K. Either two or just one phase transition was recorded in the temperature range between 335 and 461 K, depending on the warming proces…
Low-temperature specific heat and magnetization measurements have been performed on the quantum spin system NH 4 CuCl 3 which has magnetization plateaus at one-quarter and three-quarters of the saturation magnetization. It is found that the present system undergoes three-dimensional magnetic ordering at T N = 1.3 K. I…
The magnetoelectric (ME) materials exhibit ferroelectric/ferrielectric/antiferroelectric properties in combination with ferromagnetic/ferrimagnetic/antiferromagnetic properties. Under the action of external magnetic field, such materials would show electric polarizations, while the external electric field would induce…