Tubular assembly of amphiphilic rigid macrocycle with flexible dendrons
An amphiphilic rigid macrocycle was shown to self-assemble into tubular aggregates that can solubilize SWNTs in aqueous solution through significant pi-pi interactions.
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Cellular mesoscopically organized silica monoliths with tailored surface chemistry by one-step drying/extraction/surface modification processes
Large, low density silica monoliths with a hierarchical organisation of macro- and periodically arranged mesopores were obtained in a one-step procedure by treatment of as-synthesized wet gels with trimethylchlorosilane. This approach does not only offer the possibility to simultaneously achieve drying of the gel body…
Luminescence of Pulsed-Laser-Deposited SrAl[sub 2]O[sub 4]:Eu,Dy Thin Film and Its Role as a Stress Indicator
The ultimate goal of the present investigation was to develop an ,Dy thin-film phosphor on the surface of mechanical test specimens to act as a stress or crack indicator during testing. As a preliminary step, ,Dy thin-film phosphors were deposited on several conventional substrates such as quartz glass, Si(111), Si(00…
Phase behaviour of charged colloidal sphere dispersions with added polymer chains
We study the stability of mixtures of highly screened repulsive charged spheres and non-adsorbing ideal polymer chains in a common solvent using free volume theory. The effective interaction between charged colloids in an aqueous salt solution is described by a screened Coulomb pair potential, which supplements the pu…
A Simple and Effective Method for Chemoselective Esterification of Phenolic Acids
A new method for efficient and chemoselective esterification of phenolic acids in KHCO3/alkyl halide/DMF reaction system is described, by which a series of phenoic acid esters were obtained in excellent yields.
Guidelines for Developing Amide-Based Hydrogen Storage Materials
An effective method for developing amide-based high-performance hydrogen storage materials is to prepare appropriate combinations of amides and hydrides. We have proposed that a mixture of an amide with a low decomposition temperature and a hydride showing rapid reaction to ammonia would be an appropriate combination.…
Liquid crystalline properties of unsymmetrical bent-core compounds containing chiral moieties
The synthesis, characterization and mesomorphic properties of new unsymmetrical bent-core compounds containing chiral moieties are reported. These compounds have been derived from either 3-hydroxybenzoic acid or 2,7-dihydroxynaphthalene as the central unit. The chiral group is incorporated either within the bent-core…
Synthesis and Properties of Cotton Fabrics Modified with Polypyrrole
Hygienic antistatic cotton fabrics have been developed with applications in antistatic carpets, filters and hygienic hospital apparels. Cotton fabrics have been impregnated with conducting polymer, viz:- polypyrrole in various ratios. These fabrics show improved electrical conduction by about 3 - 8 orders of magnitude…
Formation of [2 + 2] diruthenium(ii) metallomacrocycles from ligands containing 2,2′:6′,2″-terpyridine domains linked through flexible polyethyleneoxy spacers
The syntheses of three ligands containing two terpy metal-binding domains linked through flexible polyethyleneoxy spacers are described. These ligands have been utilised as building blocks in a two-step process for the formation of a series of dinuclear ruthenium(II) metallomacrocycles of the type [Ru2L2]4+. Employing…
Polycarbonate-urethane hard segment type influences esterase substrate specificity for human-macrophage-mediated biodegradation
Previous studies have shown that esterase activity can degrade a variety of polyurethanes (PUs), including polycarbonate-based PUs (PCNUs). When cultured on PCNUs, differing in their chemistries, monocyte-derived macrophages (MDM) synthesized and secreted different amounts of both cholesterol esterase (CE) and monocyt…
Structure and photoluminescent features of di-amide cross-linked alkylene–siloxane hybrids
Novel amide cross-linked alkylene–siloxane hybrid materials (di-amidosils) synthesized by the sol–gel process have been investigated. Two samples identified by the notation d-A(x) with x = 4 and 8 (where x is the number of methylene groups of the alkylene chain) have been produced as transparent, amorphous, rigid mono…
Lipid modified polyelectrolyte microcapsules with controlled diffusion
The lipid coating introduced directly on (polystyrene sulfonate/polyallylamine hydrochloride)5 polyelectrolyte microcapsule surfaces significantly reduces the permeability of capsule walls estimated by fluorescence recovery after photobleaching (FRAP).
Poly(ethylene oxide)-b-poly(N-isopropylacrylamide) nanoparticles with cross-linked cores as drug carriers
Micelle-like nanoparticles that could be used as drug-delivery carriers were developed. The unique feature of these nanoparticles was that the core of poly(ethylene oxide)-b-poly(N-isopropylacrylamide) (PEO-b-PNIPAAm) micelle was lightly cross-linked with a biodegradable cross-linker, N,N-bis(acryloyl)cystamine (BAC).…
Phase Separation and Hydrothermal Degradation of 3 mol% Y2O3-ZrO2 Ceramics
Phase separation and hydrothermal degradation in 3 mol% Y2O3-stabilized tetragonal ZrO2 polycrystal (3Y-TZP) were studied by X-ray diffractometry. The Rietveld analysis showed that crystal structure of sintered body remarkably changes at high temperature. The sintered body is phase separated into high and low yttrium…
Development of Highly Active Co-Mo Catalysts with Phosphorus and Citric Acid for Ultra-deep Desulfurization of Diesel Fractions (Part 2) Characterization of Active Sites
Mo K-edge EXAFS, TEM and FT-IR of adsorbed NO were performed to further investigate the nature of the active sites on the CoMo/HY-Al2O3 catalyst containing citric acid and phosphorus, which had significantly higher HDS activity compared to the conventional CoMoP/Al2O3 catalyst. The results showed that the new catalyst…
Mechanochemical synthesis of NaNbO3, KNbO3 and K0.5Na0.5NbO3
Mechanochemical synthesis of the K0.5Na0.5NbO3 solid solution (KNN) is studied. In order to explore the mechanochemical interactions between the constituents in the Na2CO3 - K2CO3 - Nb2O5 system, NaNbO3 and KNbO3 as the boundary compositions of the KNN solid solution are also studied. It has been shown that NaNbO3 can…
Corrosion of Nickel and Nickel-Base Alloys
Abstract This article reviews the corrosion behavior in various environments for seven important nickel alloy families: commercially pure nickel, Ni-Cu, Ni-Mo, Ni-Cr, Ni-Cr-Mo, Ni-Cr-Fe, and Ni-Fe-Cr. It examines the behavior of nickel alloys in corrosive media found in industrial settings. The corrosive media include…
CdTe@Co(OH)2(core–shell) nanoparticles: aqueous synthesis and characterization
A seed-mediated growth approach for preparation of multifunctional CdTe@Co(OH)2 (core-shell) nanoparticles in the aqueous phase is reported.
Synthesis of photoacid crosslinkable hydrogels for the fabrication of soft, biomimetic microlens arrays
Soft, biomimetic microlens arrays were fabricated by interference lithography from the copolymers of poly(2-hydroxyethyl methacrylate), whose hydroxyl groups were crosslinked by photoacids and external crosslinkers.
An experimental study of incongruent dissolution of CaCO3 under analogue glacial conditions
Abstract This paper addresses the nature of incongruent dissolution of calcite in glacial settings using an experimental approach. Various CaCO 3 samples were comminuted using two contrasting techniques (dry machine-milling, and hand-grinding of an ice-water mixture) and dissolved to calcite saturation in both high-pC…