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。
Abstract The poly(3‐hydroxyoctanoate) (PHO) is a biodegradable polyester containing hydrophobic side chains. One way to obtain more hydrophilic polyester consisted in the introduction of polar groups in the side chains. Carboxyl groups (PHO 75 COOH 25 ) were introduced by chemical modifications. The role of carboxyl g…
As the size of a free-standing crystal approaches a few tens of nanometers, the image force experienced by a dislocation can exceed the Peierls force. This will lead to dislocations leaving the nanocrystal without the application of an external stress and thus making it dislocation free. In this investigation a finite…
Phase transformations in microcrystalline cellulose (MCC) were studied following dissolution of 5, 10, and 20 wt. % MCC in the ionic liquid 1-butyl-3-methylimidazolium formate (BMIMFmO) and regeneration via water. BMIMFmO was found to be useful as a non-derivatizing solvent for cellulose without the need for any pre-t…
Present study focuses the effect of calcination temperature and its duration on the morphology and growth of nanograins in individual TiO2 nanofibers synthesized by electrospinning method. Polyvinyl acetate and titanium tetraisopropoxide were used as chemical precursors along with other standard solvents in the synthe…
As biomedical materials, titanium and titanium alloys (Ti-6Al-4V) are superior to many materials in terms of mechanical properties and biocompatibility. However, they are still not sufficient for prolonged clinical use because the biocompatibility of these materials must be improved. In this study, the prevention of t…
We report on the use of polyelectrolyte multilayer (PEM) coatings as a non-biological surface preparation to facilitate uniform cell attachment and growth on patterned thin-film gold (Au) electrodes on glass for impedance-based measurements. Extracellular matrix (ECM) proteins are commonly utilized as cell adhesion pr…
The cyclic deformation behavior of ultra fine grained copper after 7 cycles of accumulative roll bonding (ARB) have been systematically investigated under both load controlled and total strain controlled tests. The composite microstructure found in the as-ARBed samples has lead to unique behavior of this material. Cyc…
High-density, uniform-sized and vertically aligned gold nanorods were grown on aluminum substrate by DC electrodeposition into modified porous anodic alumina (PAA) template. Optical reflection measurements using s- and p-polarized light showed strong surface plasmon resonances (SPRs), for both Au/PAA composites and fr…
The heat capacity of synthetic pretulite ScPO4(c) was measured by adiabatic calorimetry within a temperature range of 12.13–345.31 K, and the temperature dependence of the pretulite heat capacity at 0–1600 K was derived from experimental and literature data on H 0(T)-H 0(298.15 K) for Sc orthophosphate. This dependenc…
Abstract Multiple junctions between different grains of a pure material are investigated using the multi-phase field model in 2D and 3D. According to theoretical considerations of the multi-phase field model equations, there may be quasi-static solutions that depend on the ratio of the interface mobilities. Numerical…
We experimentally observe the theoretically anticipated but so far unverified asymmetric band gap closing for the prototypical semiconductor silicon from room temperature up to the melting point. The shift of the valence band maximum contributes more than 60% to the band gap closing in comparison to the shift of the c…
The behavior of the elastic moduli and sound absorption in a PrFe3(BO3)4 single crystal at low temperatures is studied. A transition of the magnetic subsystem into an antiferromagnetically ordered state is manifested in the temperature behavior of the sound velocities and absorption. The characteristic behavior of the…
High-pressure Brillouin and Raman scattering spectroscopy and x-ray diffraction measurements were carried out on disordered Pb(Sc1/2Nb1/2)O3, considered to be a model system for phase transitions in relaxor ferroelectrics and related materials. The observed pressure-dependent Raman spectra are unusual, with the relaxo…
Finding alternative treatments to reproduce anticorrosion properties of chromated coatings is challenging since both physical barrier and self-healing effects are needed. Siloxane based treatments are known to be a promising way to achieve physical barrier coatings, mainly plasma polymerized hexamethyldisiloxane (ppHM…
Two types of carbon nanotube (CNT) based films were fabricated by adsorbing two different types of multiwalled carbon nanotubes (MWCNTs) on bacterial cellulose membrane templates. A bacterial cellulose membrane consists of ribbon-shaped nanofibrils that are arranged to form a porous 3D network. These characteristics l…
En el presente trabajo se estudio el efecto que tiene la fibra de Guadua angustifolia Kunth con y sin tratamiento quimico, empleando hidroxido de sodio al 5 y 10%, sobre las propiedades mecanicas de una matriz polimerica reforzada con 10 y 20% de fibra en peso. Entre las propiedades mecanicas evaluadas, se incluyen pr…
The native (untreated) and alkali treated fibers from the ficus leaves were analyzed by Fourier transform infrared (FTIR), Chemical, X-ray and Thermo gravimetric methods. The morphology of the fibers before and after alkali treatment was studied by scanning electron microscopic method. The FTIR and chemical analyses i…
The paper presents the results of the analysis of the information and geometrical gist of the novel morphological characteristics of superabrasive powders and the degree of sensitivity of these characteristics to changes in the powder quality. A new original procedure is proposed for the indirect determination of the…
Kinetic study of H 2 oxidation in the preferential oxidation (PROX) of CO was implemented over a nanosize Au/CeO 2 catalyst in a temperature range 313−353 K. The Langmuir−Hinshelwood mechanism was proposed to be mainly responsible for H 2 oxidation, and CO oxidation can be accelerated by coadsorbed H at low temperatur…
TPPMnOAc and four different kinds of manganese tetraphenylporphyrin acetates were synthesized using different numbers of methoxy substituents in various positions of the phenyl rings. These porphyrins were used as catalysts in the epoxidation of various alkenes with tetra-n-butylammonium hydrogen monopersulfate (n- Bu…