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。
This article reports on the early stages of nucleation and growth and texture development of the perovskite phase in PZT(52/48) seeded and unseeded sol−gel thin films. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) revealed that, in seeded films, the perovskite phase nucleates and grows at the film…
A giant reversible increase $(>~{10}^{3}$ times) of the optical second-order harmonic's (SH) absorption by optical poling of oxide glass was found. The SH's absorption kinetics manifested anisotropy with respect to polarization of the pumping (poling) light. The observed absorption exerts the influence of optical p…
Cu1.8S quantum dots were prepared by using a single-source-precursor type method and investigated in the light of opto-electronic applications. With femtosecond time-resolved transient absorption measurements, the electron relaxation as well as their trapping dynamics could be evaluated. The measurements reveal that t…
With Hansen's solubility parameters, δ o 2 = δ d 2 + δ p 2 + δ h 2, the correlation between the degree of exfoliation of organically modified clays and the solvent in which the clay platelets are dispersed/mixed has been analyzed. It has been found that the dispersion force of the solvent, reflected by δ d, is the pri…
Structural competition in boron group elements has been studied by means of ab initio calculations. For boron we predict a structural change $\ensuremath{\alpha}\mathrm{\text{\ensuremath{-}}}\mathrm{B}\ensuremath{\rightarrow}\ensuremath{\alpha}\mathrm{\text{\ensuremath{-}}}\mathrm{G}\mathrm{a}$ accompanied by a nonmet…
Alumina nanotubes, nanofibers, and nanorods were synthesized through a new method based on a surfactant-driven hydrothermal process, but without adding any organic solvent. Our procedure provides a single-step, low-temperature route to different alumina nanostructures with thermal stability by varying the nature of su…
In this paper, we present the fabrication process of a shape memory alloy (SMA) thin film in both monolithic and hybrid configurations. This provides an effective actuation part for a gripper made of SU-8 thick photoresist. We also extensively describe and discuss the assembly of the SMA thin film with the SU-8 mechan…
The dynamics of supported polymer films were studied by probing the surface height fluctuations as a function of lateral length scale using x-ray photon correlation spectroscopy. Measurements were performed on polystyrene (PS) films of thicknesses varying from 84 to 333 nm at temperatures above the PS glass transition…
A series of SBA-15 silicas was synthesized using triblock copolymer templates with the same length of poly(propylene oxide) block (PO m; m = 70) and different average lengths of poly(ethylene oxide) blocks (EO n, n = 17−28). The average EO n length was varied by mixing EO 20 PO 70 EO 20 copolymer with either EO 5 PO 7…
The local dynamics and the nonlinear rheology of soft colloidal pastes are shown to exhibit a remarkable universal behavior in terms of a unique microscopic time scale. This variable is associated with structural relaxation under the combined action of local frictional forces and elastic driving forces. These results…
Gold nanoparticles were selectively attached to chemically functionalized surface sites on nitrogen-doped carbon (CN x ) nanotubes. A cationic polyelectrolyte was adsorbed on the surface of the nanotubes by electrostatic interaction between carboxyl groups on the chemically oxidized nanotube surface and polyelectrolyt…
Abstract A gel permeation chromatography (GPC) calculation method has been developed to determine the absolute molecular weight of a star‐shaped styrenic block copolymer with GPC–ultraviolet/refractive index calibrated with linear polystyrene standards. To illustrate the simplicity of this method, we have synthesized…
Abstract In packaging applications, blocking is always found in low‐density polyethylene (LDPE) films. Practically, such problems can be solved by incorporation of antiblocking agents, for example, silica and talc. The objective of this research was to explore the possibility of using silica from rice husk ash (RHA si…
Abstract Methacrylic acid (MAA) and methyl methacrylate (MMA) were used as additives for peroxide‐cured styrene–butadiene rubber (SBR) filled with three inorganic fillers with different particle sizes and surface activity, for example, MgO, Mg(OH) 2 , and BaSO 4 . The experimental results show that the introduction of…
Abstract Biopitch is a renewable source of polyol obtained from Eucalyptus tar distillation, which was studied as an active component of polyurethane (PU). The polymerization occurred in one step, with a mixture of biopitch and hydroxyl‐terminated polybutadiene polyols reacted with 4‐4′‐diphenyl methane diisocyanate i…
Passive metals are protected from the environment by a thin (3--5 nm) oxide film that forms on their surface. The corrosion rate of these materials is typically of the order of $0.1\ensuremath{\mu}\mathrm{m}/\mathrm{y}\mathrm{e}\mathrm{a}\mathrm{r},$ and depends on the electronic structure of the oxide layer. Here we…
Microfluidic systems have become important platforms for diagnostic and therapeutic applications. However, as channel dimensions decrease within these systems, the surface properties of these microchannels become increasingly important. When biological fluids are flowed through such channels, nonspecific protein adsor…
A novel type of redox-active materials, which to our knowledge are the first examples of mesoporous silica hosts containing dendritic guest molecules within their highly ordered channels, is presented. A simple and efficient synthetic route has been used to incorporate poly(propyleneimine) dendrimers containing 4, 8,…
Abstract The effect of shear‐controlled orientation injection molding (SCORIM) was investigated for polybutene‐1/polypropylene blends. This article reports on the methods and processing conditions used for blending and injection molding. The properties of SCORIM moldings are compared with those of conventional molding…
Abstract Polypropylene (PP) was melt‐blended in a single‐screw extruder with a thermotropic Vectra B‐950 liquid crystalline polymer (LCP) in different proportions. The mechanical properties of such blends were compared in respect of their Young's moduli, ultimate tensile strength (UTS), percent elongation at break, an…