Materials Literature
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Thin films (9-70 nm) of a series of polymers containing in the main chain dibenzo-18-crown-6 ether unit (DB18C6) linked to an aliphatic spacer of different length (10C and 14C) and nature have been prepared, from chloroform solutions, by spin coating on a silicon substrate. The quality and homogeneity of the polymer c…
The prostate-specific antigen (PSA) is a serine protease that is over-expressed in prostate carcinoma and represents a molecular target for selectively releasing an anticancer agent from a prodrug formulation. We have recently investigated a macromolecular prodrug strategy for improved cancer chemotherapy based on 2 f…
Abstract Four complexes with 4′,5′‐diaza‐9′‐[4,5‐bis(methylthio)‐1,3‐dithiol‐2‐ylidene]fluorene (L 1 ) or 4′,5′‐diaza‐9′‐[4,5‐bis(ethylthio)‐1,3‐dithiol‐2‐ylidene]fluorene (L 2 ) were synthesized. The complexes [Co(L 1 ) 2 Cl 2 ] · 2CH 3 OH ( 1 ), [Cu(L 2 ) 2 Cl 2 ] · CH 3 OH · 0.5CH 2 Cl 2 ( 3 ), and [Cu(L 2 ) 2 Br 2…
Innovative infrared nonlinear optical crystals CsGe(Br x Cl 1− x ) 3 were synthesized. From their powder x-ray diffraction patterns, these crystals were characterized as rhombohedral structure with ( R 3 m , No 160) space group symmetry. The energy gap decreased from about 3.43 to 2.38 eV as the substitutional ratio,…
The sugar cane residue bagasse is an underutilized renewable agricultural material. Bagasse is generally grey-yellow to pale green in color. It is bulky and quite nonuniform in particle size. As it is produced at the sugar mills, bagasse is used as fuel in the power plant. However, wherever there is large scale produc…
Charcoals prepared from certain tropical woods contain stable paramagnetic centers, and these have been characterized by EPR spectroscopy in the absence and presence of oxygen. The EPR-detectable spin density has been determined, as has been the temperature- and frequency-dependence of the oxygen broadening of the EPR…
A systematic study of the interfacial activity of polymer-coated gold nanoparticles was performed with the use of a computer-controlled four-roll mill. The nanoparticle locality within the polymeric domains (bulk or interface) was controlled by means of a mixture of polymeric ligands grafted to the gold nanoparticle c…
Pedicularioside G is a new compound of phenylpropanoid glycosides, isolated from Pedicularis striata in our laboratory. Pedicularioside G inhibited two major angiogenic responses, human umbilical vein endothelial cell proliferation and migration, as well as neovascularization in a chicken embryo chorioallantoic membra…
Irradiation of ultrahigh molecular weight polyethylene (UHMWPE) with a dose of 150 kGy by an electron beam can effectively increase the entanglement density in the amorphous phase and has little influence on the properties of the crystalline phase, which provides examples to comparatively investigate the role of lamel…
The present work deals with the stress generation capability of nickel–titanium shape memory alloys (SMAs) under constrained conditions for two well-defined loading modes: recurrent crystalline transformation (transformation fatigue) and a one-step continuous activation (generated stress relaxation). The data acquired…
Precise low-frequency internal friction measurements on vitreous silica, taken over a wide temperature (4 K< T <300 K) and frequency range (40 Hz<ν<14 kHz), show remarkable similarities, but also suggestive differences with recent light scattering experiments. In the interval 30 K< T <110 K, the exponent α of the powe…
ZnO single crystals were implanted with Ar ions with an energy of 100 keV and different fluences. Ferromagnetic behaviour is observed at room temperature after implantation. This behaviour is suppressed after consecutive annealings at 400 and 500 °C. Although trace transition metal impurities have been identified in t…
Abstract The prototype operation of an ultrafast write–readout–erase–readout cycle of an all‐optical system based on photochromic indolylfulgides is demonstrated. In the employed dye the molecular structure is switched using light of different wavelengths between two thermally stable states to allow binary encoding of…
Polypropylene (PP)/natural rubber (NR) composites were prepared by incorporating rubberwood at different loadings into PP/NR matrix using a Brabender plasticorder at a temperature of 180°C and a rotor speed of 50 rpm for 10 minutes. A compatibilizer, E-43 (maleated polypropylene) was used to improve the mechanical pro…
$Cmcm$ $\mathrm{Ca}\mathrm{Ir}{\mathrm{O}}_{3}$ is isostructural to the newly discovered high-pressure postperovskite polymorph of $\mathrm{Mg}\mathrm{Si}{\mathrm{O}}_{3}$. Due to the high transition pressure in $\mathrm{Mg}\mathrm{Si}{\mathrm{O}}_{3}$ over $100\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, low-pressure an…
On the basis of first-principles calculations, we investigate transport properties of spin-polarized electrons in defective metallic single-wall carbon nanotubes (SWCNTs) under homogeneous transverse electric fields. Either vacancies or carbon adatoms are introduced in (10,10) SWCNT and are shown to play a role of qua…
From the nanoscale to the macroscopic scale, intelligent materials are triggering a response across both dimensions and scientific disciplines... World class, leading experts in the fields of chemistry, physics and engineering have contributed to Intelligent Materials, highlighting the importance of smart material sci…
We prepared a large slice crystal of trans -DPDSB with a regular shape by the physical vapor transport method and determined its crystal structure, which is different from the needle-like crystal grown in a mixture of chloroform and methanol. In the slice crystal, all of the molecules are packed in layer-by-layer mode…
The catalytic growth of single-wall carbon nanotubes is investigated at the nanotube tip using first-principles molecular dynamics and tight-binding Monte Carlo simulations. At experimental temperatures (approximately 1500 K), the catalytic atom is found to incorporate into the carbon network instead of scooting aroun…
Among the thermodynamic properties of novel materials for solid-state hydrogen storage, the heat of formation/decomposition of hydrides is the most important parameter to evaluate the stability of the compound and its temperature and pressure of operation. In this work, the desorption and absorption behaviors of three…