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。
From being a niche area only a few decades ago, fluorous chemistry has gained momentum and is, nowadays, a fervent area of research. It has brought forth, in fact, numerous applicative innovations that stretch among different fields: from catalysis to separation science, from supramolecular to materials and analytical…
A theoretical perspective is provided on the glass transition in molecular liquids at thermal equilibrium, on the spatially heterogeneous and aging dynamics of disordered materials, and on the rheology of soft glassy materials. We start with a broad introduction to the field and emphasize its connections with other su…
Efforts to extend nanoparticle residence time in vivo have inspired many strategies in particle surface modifications to bypass macrophage uptake and systemic clearance. Here we report a top-down biomimetic approach in particle functionalization by coating biodegradable polymeric nanoparticles with natural erythrocyte…
We present the result of the diatoms study at the mouths of the Sinos, Gravatai, Cai and Jacui rivers, with emphasis on the form of the plastids and their arrangement within the cell from the Jacui Delta. Although this character has been neglected in recent decades, it is currently recognized by its ecological importa…
We report the optical reflectivity and Raman scattering of few layer (L) graphene exposed to K and Rb vapors. Samples many tens of layers thick show the reflectivity and Raman spectra of the stage 1 bulk alkali intercalation compounds (GICs) KC(8) and RbC(8). However, these bulk optical and Raman properties only begin…
Nobel metals that are deposited on a polymer surface exhibit surface diffusion and diffusion into the bulk. At the same time the metal atoms tend to form clusters because their cohesive energy is about two orders of magnitude higher than the cohesive energy of polymers. To selfconsistently simulate these coupled proce…
RPdBi (R = Er, Ho, Gd, Dy, Y, Nd) compounds were studied by means of x-ray diffraction, magnetic susceptibility, electrical resistivity, magnetoresistivity, thermoelectric power and Hall effect measurements, performed in the temperature range 1.5-300 K and in magnetic fields up to 12 T. These ternaries, except diamagn…
Single-wall carbon nanotube (SWNT) nanofibrils were assembled onto a variety of conductive scanning probes including atomic force microscope (AFM) tips and scanning tunnelling microscope (STM) needles using positive dielectrophoresis (DEP). The magnitude of the applied electric field was varied in the range of 1-20 V…
Recently, much attention has been paid to chitosan as a potential polysaccharide resource. Although several efforts have been reported to prepare functional derivatives of chitosan by chemical modifications, few attained their antimicrobial activity against plant pathogens. The present paper aims to present an overvie…
The uniaxial symmetry in the liquid crystalline phase leads to anisotropy in many physical properties. A simple look on a piece of wood reveals that also its structure is anisotropic. It has also strong anisotropic dielectric properties in the microwave range, like liquid crystals in the visible range. Therefore the w…
Cloud point measurements and calorimetric properties were considered for binary systems of polystyrene/4cyano-4′-n-octylbiphenyl (8CB), and deuterated polystyrene/8CB. The experimental phase diagrams were established using polarizing optical microscopy and differential scanning calorimetry. The experiments were realiz…
The anisotropy of the substrate is responsible for inducing alignment of liquid crystal. Several techniques such as mechanical contact, light and plasma irradiation, which can create the anisotropy, are being tried to apply in commercial products. In this research, electron beam irradiation was used to induce liquid c…
Gradient elasticity models have been proposed in recent years in order to describe phenomena that cannot be described by classical elasticity models. In this contribution, the finite element model is conducted within the context of non-classical continuum mechanics, by introducing a material length scale parameter. Th…
A reflective cholesterol liquid crystal (CLC) display with a wide viewing angle is demonstrated using the phase-separated composite film (PSCOF) method. The PSCOF-based CLC is formed by periodic and gradient UV illumination, slow polymerization and phase separation of the LC and prepolymer mixture. The helical axis of…
Chiral liquid crystal phases have been attracting great interest in the past years because of their unique optical properties, such as: selective light reflection, optical dichroizm, ferro- and antiferroelectric behavior. One of the most popular ways of obtaining such materials is an addition of chiral dopants with hi…
We investigated the influence of some estradiol derivatives on the thermal and structural properties of binary mixtures of cholesteryl enantate and cholesteryl myristate. The characterization of the mesophases was made by polarizing optical microscopy, differential scanning calorimetry and X-ray diffraction. A conside…
Ag(2)Co(3)(HPO(4))(PO(4))(2) contains CoO(6) octa-hedra and phosphate groups linked to form a three-dimensional network defining tunnels parallel to the a axis that are occupied by Ag(+) ions.
Dielectric dispersion of a chiral smectic liquid crystal has been measured in the very broad frequency range from 0.1 mHz to 50 kHz. Two regions of dispersion have been recognized: the first one, from 0.1 mHz to 0.1 Hz was for the first time measured, the second one, from 100 Hz to 50 kHz, which is known as mainly due…
Calorimetric investigation on the effect of enantiomeric excess on the smectic- (Sm) – smectic-C* (SmC*) phase transition has been carried out using a high-sensitivity differential scanning calorimetry in an antiferroelectric liquid crystal compound. For highly optically pure samples, the Sm – SmC* transition is found…
Abstract A series of porphycenes bearing acetoxy and hydroxy groups at the meso-positions have been prepared and fully characterized: H2TPrPc-OH, [Ni(TPrPc-OH)], H2TPrPc-OAc, and [Ni(TPrPc-OAc)], where TPrPc-OH: 9-hydroxy-2,7,12,17-tetrapropylporphycenato dianion and TPrPc-OAc: 9-acetoxy-2,7,12,17-tetrapropylporphycen…