Materials Literature
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Kevlar coated carbon nanotubes have been used as additives to polyvinylchloride, resulting in composites with improved mechanical properties demonstrating up to 50% and 70% increases in tensile strength and Young's modulus respectively at very low nanotube loading levels.
An attempt was made to synthesize a large-size silica porous monolith with straight and parallel nanochannels using an ice-rod nanoarray as a template. Since the previously reported ice templating methods allowed only the formation of micrometer-sized channels, special efforts were made to decrease the channel size do…
Two novel mesoporous nickel phosphates (NiPO-1 and NiPO-2) with nanotubular structures were developed in the presence of cationic surfactant and different bases by a sol–gel method. The mesostructures of NiPO-1 and NiPO-2 are composed of nanotubes of different lengths, which are arranged by a less-ordered lamellar sym…
Cordierite with ultra high porosity and oriented micrometer-sized cylindrical pores was prepared using a novel gelation-freezing method. Gelatin (used as the gelation agent), water (for formation of pores), and cordierite powder were mixed and cooled at 7°C. The obtained gel was frozen at -20 or -50°C, was dried using…
l-Proline was immobilized onto mesoporous silica through direct synthesis method via morphosynthesis possessing short channels and plugs in the pore structure which provided chiral enhancement in the diethyl malonate addition reaction.
Compared with linear thermoresponsive polymers hyperbranched ones having spheroid-like structure exhibited an unusual salt effect: a non-linear LCST decrease upon increasing the concentration of various salts such as NaCl, KCl or Na2SO4 has been observed. The LCST variation of such polymers was more sensitive to the p…
Bone tissue engineering is a field of significant research interest owing to the large number of bone defects and the limitations in the present techniques to effectively reconstitute the defects. Cell-based bone graft technique has shown promise in overcoming the limitations of the other bone graft techniques current…
This study compared differences in discoloration and dissolution in several titanium alloys with immersion in peroxide- or fluoride-containing solution. Commercially pure titanium (CP-Ti) and six titanium-based alloys were used: Ti-0.15Pd, Ti-6Al-4V, Ti-7Nb-6Al, Ti-55Ni, Ti-10Cu, and Ti-20Cr. Two test solutions were p…
A newly designed anthracene derivative having gluconamides at its peripheral branches formed a photo-responsive hydrogel. SEM observation of the xerogel showed a network structure consisting of fibrils. Upon photoirradiation (lambda >300 nm) of the hydrogel, regioselective photodimerization of the anthracene moiety oc…
Asymmetric functionalization of the tetraarylporphyrin scaffold, combined with directional supramolecular halogen bonding, yields chiral architectures.
Density functional theory (DFT-D) and semi-empirical (PM3-D) methods having an added dispersion correction have been used to study stabilising carbohydrate-aromatic and amino acid-aromatic interactions. The interaction energy for three simple sugars in different conformations with benzene, all give interaction energie…
Different strategies for the demetalation of corrole complexes have been developed, using copper complexes of corrole as model compounds. Best results were obtained using the acidic mixture CHCl 3 / H 2 SO 4 , which allowed the almost complete removal of copper ions from both meso-triaryl-, β-octaalkyl- and fully subs…
A fully dianisylaminophenylated aza[1(4)]metacyclophane has been synthesized that exhibits four reversible two-electron oxidation processes, and its dicationic and tetracationic species have been found to be in spin-triplet and spin-quintet states.
The improvement of mechanical properties of spruce galactoglucomannan (GGM)-based films was sought by blending GGM with each of poly(vinyl alcohol) (PVOH), corn arabinoxylan (cAX), and konjac glucomannan (KGM). The blend ratios were 3:1, 1:1, and 1:3 (w/w), and in addition films were made from each of the polymers alo…
Two kinds of β ‐SiAlON nanostructure whiskers, rod‐like and wool‐like whiskers, were synthesized by pressure‐less sintering method at 1773 K for 5 hours. The whiskers synthesized were characterized by powder X‐ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and high‐r…
The analysis of line profiles in Powder Diffraction patterns is a topic nearly as old as diffraction itself. However, despite the long time that has passed since the pioneering studies of Scherrer (1918),1 and the rich literature and textbooks2–5 produced over many decades, line profile analysis is ...
For the majority of the last century, commercial routes to regenerated cellulose fibres have coped with the difficulties of making a good cellulose solution by using an easy to dissolve derivative (e.g. xanthane in the case of viscose rayon) or complex (e.g. cuprammonium rayon). For the purposes of this paper, advance…
Colloidal hybrid nanoparticles with blebs of II–VI and IV–VI particles on top of FePt particles were successfully grown. Whereas in the case of XE = CdS, ZnS, PbS and CdSe, FePt–XE dimer structures were successfully obtained, the growth failed for XE = ZnSe, PbSe. Structural, magnetic, and optical analysis of the stru…
Pd nanoparticles dually encased by soft (polyamine) and hard (silica) materials in a microcapsule structure, obtained via a nanoparticle self-assembly method, exhibit excellent catalytic activity, with efficient catalyst recovery and reusability.
Abstract Dense bulk Ta 2 AlC ceramic was fabricated by in-situ reaction/hot pressing of Ta, Al and C powders. The reaction path and effects of initial composition on the purity were investigated. It was found that Ta 2 AlC formed through the reactions between AlTa 2 and graphite, or between Ta 5 Al 3 C, TaC and graphi…