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 study the motion of two colloidal (‘probe’) particles translating along their line of centres with fixed, equal velocities in an otherwise quiescent colloidal dispersion. The moving probes drive the microstructure of the dispersion out of equilibrium; resisting this is the Brownian diffusion of the dispersion ‘bath…
We have investigated nanoscale compositional and structural variations in Ce(0.5)Zr(0.5)O(2) samples with different redox properties. Different samples were prepared using a spray freezing technique, and the synthesis conditions were varied to yield materials with reduction temperatures in the range of 400-750 degrees…
Using quantitative fluorescence microscopy in conjunction with a method of gradient substrate assembly established in their group, the authors were able to introduce and measure reproducible changes in cellular morphology and cell density by manipulating polymer grafting density. The mechanism behind this change in ce…
Abstract Electronic and optical properties of widegap oxychalcogenides, LaCuO Ch ( Ch = chalcogen) and La 2 CdO 2 Se 2 , are reviewed with a focus on those relevant to their layered crystal structures, including high hole mobility, degenerate p‐type conduction, room temperature exciton, and large third order optical n…
The dynamics of water (${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O}$) molecules adsorbed inside single-wall carbon nanotubes (SWCNTs) of average diameter $13.5\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ were investigated by means of $^{2}\mathrm{H}$- and $^{1}\mathrm{H}$-NMR between 100 and $300\phantom…
We evaluated enthalpies of formation and formation energies of neutral vacancies in KNbO3 and KTaO3 using a plane-wave pseudopotential method within a density functional formalism. The KNbO3 (R 3mR ) phase with the lowest symmetry was found to have the lowest enthalpy of formation. On the other hand, the various virtu…
Motivated by recent structural data questioning the adequacy of the charge order (CO) or disorder picture for the Verwey transition (at $T={T}_{V}$) in magnetite, we reinvestigate this issue within a new theoretical picture. Using the local density $\text{approximation}+\text{dynamical}$ mean-field theory ($\mathrm{LD…
A great deal of information on the efficiency of gypsum or phosphogypsum to ameliorate acidity in highly weathered soils is available, but only limited information is available on the efficiency in acid Andosols, which possess large amounts of active aluminum (Al). We examined the effectiveness of gypsum application t…
Abstract ZnO 1– x S x films in the whole composition range were deposited by radio‐frequency reactive sputtering on different substrates. Raman measurements verified that the LO phonon of ZnO shifts towards lower frequencies as a function of the S content in the alloyed films. The composition dependence of the band ga…
We consider a semi-infinite nematic in contact with a periodic patterned surface with alternate planar and homeotropic stripes. Extending the work of Barbero, we find the free energy (assuming K1 = K3) for the situations where the easy direction on the planar stripe is either perpendicular or parallel to the length of…
Abstract Magnetic and dielectric properties of the ruthenium double perovskites La 2 MRuO 6 (M = Mg, Co, Ni, and Zn) were investigated. The magnetization measurements for M = Co and Ni showed the existence of magnetic order at 20–30 K. Though the oxides with M = Zn and Mg exhibit a deviation from the Curie–Weiss law,…
We presented a detailed study on the electronic structure and optical properties of cupric azide (Cu(N(3))(2)), mercuric azide (alpha-Hg(N(3))(2)), and lead azide (alpha-Pb(N(3))(2)) by using density functional theory within the generalized gradient approximation. Relaxed crystal structures compare well with experimen…
In this paper, we characterize the rotational dynamics and observe rotor-rotor interactions within a crystalline, three-dimensional array of dipolar molecular rotors. The rotating portion of each rotor molecule consists of a dipolar fluorine-substituted phenyl group. The phenyl rotors are connected by acetylene linkag…
The validity of the theory of McCumber [Phys. Rev.136, A954-A957 (1964)] has been tested by applying it to a number of ground-state transition in various rare-earth-doped glasses. Special attention was given to those aspects of the experimental procedure that can lead to systematic errors, such as reabsorption of fluo…
The measurement of complete polarimetric parameters for a broad spectrum of wavelengths is challenging because of the multi-dimensional nature of the data and the need to chromatically separate the light under test. As a result, current methods for spectropolarimetry and imaging polarimetry are limited because they te…
Abstract The changes in the surface chemistry of the oxidised surface of evaporated magnesium metal stored in the ambient atmosphere are studied with water contact angle (WCA) measurement, polarisation‐modulation infrared reflection‐absorption spectroscopy (PM‐IRRAS) and X‐ray photoelectron spectroscopy (XPS). Upon ex…
A novel technique for conjugating Arg-Gly-Asp (RGD) peptides to poly(dimethylsiloxane) (PDMS) surfaces as well as its application to cell culture is presented in this paper. This technique performs RGD conjugation to PDMS through photochemical immobilization of functional NHS groups to PDMS surface followed with linki…
Aqueous polyurethane dispersions were prepared with 4−10 wt % of functionalized polyhedral oligomeric silsesquioxanes (POSS) via homogeneous solution polymerization in acetone followed by solvent exchange with water. The use of acetone as the initial polymerization solvent allowed for the facile incorporation of both…
In situ high pressure neutron diffraction measured lengths of O H and H O pairs in hydrogen bonds in substances are shown to follow the correlation between them established from 0.1 MPa data on different chemical compounds. In particular, the conclusion by Nelmes et al that their high pressure data on ice VIII differ…
The fully reversible three-state blue/red/off emission from photo-/electrochromic substituted bis-thiaxanthylidenes is reported. The blue luminescence of the most stable (anti-folded) conformer of dimethyl- and dimethoxy-bis-thiaxanthylidene can be switched off by photochemical conversion to the meta-stable (syn-folde…