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。
An approach for the development of a new class of multifunctional photochromic liquid crystalline materials has been devised. Copolymerization of acrylic monomers allowed the preparation of ternary cholesteric copolymers containing nematogenic (phenyl benzoate), photochromic (azobenzene), and chiral photochromic side…
To clarify the influence of impurities on the sintering of SiC powder, three 6H‐SiC powder samples—with different levels of SiO 2 and aluminum impurities—were sintered with additions of boron and carbon. The densification, grain growth, and transformation of 6H‐SiC during sintering were studied qualitatively. The powd…
The mass of polyelectrolyte films adsorbed onto a surface during the deposition of a thin polymer film by a layer-by-layer sequential adsorption process was systematically controlled using a feedback system with a computer. For the deposition process, a quartz crystal microbalance (QCM) with an integrated oscillation…
The chlorination of vulcanized styrene-butadiene rubbers (SBRs) with trichloroisocyanuric acid (TCI) has been studied. The solvent used to apply the TCI chlorinating solutions on the rubber plays an important role in the effectiveness of the treatment since the solvent determined the degree of penetration of TCI into…
Millimeter-sized tubular crystals of Ag2Se are successfully grown for the first time via a hydrothermal reaction route from AgCl, Se and NaOH at 155 °C.
The potential applicability of high-resolution electron microscopy (HREM), in combination with image analysis and image simulation tools, to retrieve structural information from nanometre-sized particles present in oxide-supported metal and oxide catalysts is analysed. Specifically, the possibilities and limitations o…
The static electric dipole polarizabilities and second-order hyperpolarizabilities of several bare boron clusters have been calculated with density functional theory. The average second-order hyperpolarizability γav reaches a saturation limit of about 50,000 a.u. already with B5 for a given type of structure. The aver…
The geometry, vibrational frequencies and stability of the structural isomers of small gallium nitride clusters (n = 2–4) have been investigated using density functional theory. The lowest energy structures are cyclic. The ground electronic state of the cyclic forms for n > 2 is the singlet state. All of the cyclic st…
A polymeric precursor method was used to synthesis PbTiO3 amorphous thin film processed at low temperature. The luminescence spectra of PbTiO3 amorphous thin films at room temperature revealed an intense single-emission band in the visible region. The visible emission band was found to be dependent on the thermal trea…
The π-conjugated polymer poly(p-diethynylbenzene) (PDEB) has potential applications in electronics and optics; however, its poor solubility and processability have limited its usefulness. The new synthesis reported here makes use of a novel nickel catalyst, and gives rise to PDEB with good solubility and excellent the…
We propose and demonstrate alkali bismuth gallate glasses as suitable hosts for the rare earth praseodymium (Pr3+) operating at 1.3-µm wavelength. The structure of the glasses was investigated by Raman spectroscopy. The optical absorption and the photoluminescence properties of Pr3+ in these glasses were characterized…
Olefins were smoothly epoxidized under O2 (1 atm) in the presence of a hydrocarbon such as ethylbenzene or tetralin, using N-hydroxyphthalimide (NHPI) and Mo(CO)6 as catalyst; the present reaction involves autoxidation of the hydrocarbon assisted by NHPI and epoxidation of alkenes with the resulting hydroperoxide cata…
Polypropylene (PP) was functionalized with acrylic acid (AA) and styrene (st) as a comonomer by means of a radical-initiated melt-grafting reaction. FTIR, ESCA, and 1H-NMR spectroscopies were used to characterize the formation of polypropylene grafted with acrylic acid (PP-g-AA) and polypropylene grafted with acrylic…
The identification of fullerene-like sites on carbon black surface and in particular the pentagonal or corannulene-type sites, has permitted us to explain the chemical interaction between filler and polymer (diene rubber) occurring during mixing in terms of free radical and Diels-Alder addition of polymer chains on th…
The atomistic simulation of properties and phenomena in solid materials requires a suitable model of the real system with a number of atoms which is still manageable at the chosen level of approximation. Since typical solids consist of atoms in the order of 1023, only a very small fraction of them can be treated expli…
Ethylene-vinyl acetate (EVA) copolymer functionalized with mercapto groups (EVALSH) has been used as compatibilizing agent in nitrile rubber/EVA blends. The tensile strength and elongation at break of the system were measured as a function of the EVALSH content and blend composition. The compatibilization affects the…
The intermolecular Zn(II) porphyrin–fullerene interaction efficiently occurs in an organogel system: the gelation ability of Zn(II) porphyrin-appended cholesterol gelator 3 is enhanced by the formation of a 2 ∶ 1 Zn(II) porphyrin/[60]fullerene sandwich complex.
In this study, tantalum carbide ( TaC x ) films deposited by a sputtering process with a TaC target as diffusion barriers for Cu metallization were investigated for the first time. The thermal stability of Cu / TaC x / n ‐ Si and Cu / TaC x / p + n systems as a function of annealing temperature are reported and analyz…
The self-organizing capability of a family of newly synthesized ‘free-base', H2(OASPz), and metal porphyrazines, M(OASPz) (OASPz2− = 2,3,7,8,12,13,17,18-octakis(alkenylthio)-5,10,15,20-tetraazaporphyrinato dianion, n = 4, 5, 6, 8; M = Co, Ni, Cu), into columnar, discotic liquid crystals, has been investigated by diffe…
A phthalocyanine derivative having eight 2-thienyl substituents at the β-position was synthesized and electrochemical oxidation of the phthalocyanine gave an insoluble polymer film on the electrode surface.