Materials Literature
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Abstract The alkyd resins of three different compositions based on nahar seed oil ( Mesua ferrea ), phthalic anhydride, and maleic anhydride were synthesized by an alcoholysis method. These alkyd resins were blended with a commercially available epoxy resin (Araldite 250, Ciba Geigy, Mumbai, India) separately to study…
We report results for the electronic structures of extended silver single-wall nanotubes (AgSWNTs) within a first-principles, all-electron self-consistent local density functional approach adapted for helical symmetry. We carried out calculations on twenty-one different AgSWNTs ranging in radii from approximately $1.3…
Electronic correlations are manifested in many-body effects like superconductivity and magnetism. Established theoretical concepts show that the Coulomb and exchange interaction result in a tendency of two electrons to avoid each other, leading to an exchange-correlation (xc) hole. We will report on double photoemissi…
This work shows that mesoporous polymeric films with spherical and elliptical pores can be obtained by in situ structure inversion of the azo polymer colloid arrays through selective interaction with solvent. The epoxy-based azo polymer contained both the pseudo-stilbene-type azo chromophores and the hydrophilic carbo…
We report on the low-temperature properties of the ternary europium pnictide $\mathrm{Eu}{\mathrm{Zn}}_{2}{\mathrm{Sb}}_{2}$. Bulk properties were characterized in terms of the electrical resistivity, magnetoresistance, Hall effect, magnetization, specific heat, and thermal expansion. The data are consistent with an a…
A 40 kD protein has been extracted from the biomineral matrix of the calcium carbonate gastropod shell of Strombus decorus persicus. The protein was isolated by decalcification and ion exchange HPLC. We have named this protein ACLS40, i.e., aragonite crossed-lamellar structure protein. A partial sequence of the isolat…
Abstract This report describes the flame retardancy of a polycarbonate (PC)–polydimethylsiloxane (PDMS) block copolymer with a dimethylsiloxane (DMS) block size of 15–350 units, and the effects of the block size and amount of DMS on the flame retardancy are studied. PC–PDMS block copolymers with DMS units of 40–130 ha…
This study investigated the feasibility of using selected dendrimers for the removal of lead (Pb 2+ ) from three contaminated soils. Lead removal was tested in a fixed-bed column setup, where a prescribed dendrimer solution was passed through a lead-loaded soil bed. Effects of dendrimer generation, concentration, type…
We have investigated the cause of catalyst deactivation observed during surface-confined atom-transfer radical polymerization of acidic monomers. Surface-tethered polyelectrolyte layers of poly(itaconic acid) and poly(methacrylic acid) were grown from self-assembled initiator monolayers of 2-bromoisobutyryl bromide te…
Stimulated Stokes emission has been observed from silicon crystals doped by antimony donors when optically excited by radiation from a tunable infrared free electron laser. The photon energy of the emission is equal to the pump photon energy reduced by the energy of the intervalley transverse acoustic (TA) g phonon in…
Abstract Polypropylene/polyamide 6 blends and their nanocomposites with layered silicates or talc were prepared in a melt‐compounding process to explore their mechanical performance. The thermomechanical behavior, crystallization effects, rheology, and morphology of these materials were studied with a wide range of ex…
Abstract Copolymers of ethene and 1‐octene, 1‐dodecene, 1‐octadecene, and 1‐hexacosene were carried out with [Ph 2 C(2,7‐di‐ tert BuFlu)(Cp)]ZrCl 2 /methylalumoxane as a catalyst to obtain short‐chain branched polyethylenes with branch lengths of 6–26 carbon atoms. This catalyst provided high activity and a very good…
Abstract Blocked polyurethane (PU)/epoxy full‐interpenetrating polymer network (full‐IPN) were synthesized from blocked NCO‐terminated PU prepolymer, with 4,4‐methylene diamine as a chain extender and epoxy prepolymer, with 4,4‐methylene diamine as a curing agent, using simultaneous polymerization (SIN) method. From F…
We have carried out a systematic study of the time-dependent rheology and morphology of poly(dimethylsiloxane) (PDMS) ionomers with tailored number of monomers between ions and number of ions per chain as a function of the cation. Small-angle X-ray scattering (SAXS) and scanning transmission electron microscopy (STEM)…
We have studied two types of topological substrates--the continuous solid substrates (CSS) and the discontinuous solid substrates (DSS)--by using the dissipative particle dynamics (DPD) method for a better understanding of the contact angle hysteresis on two such substrates. After the validation of DPD in the system,…
We have performed a systematic study of the layered ternary carbides ${\mathrm{Ti}}_{2}\mathrm{Al}\mathrm{C}$, ${\mathrm{V}}_{2}\mathrm{Al}\mathrm{C}$, and ${\mathrm{Cr}}_{2}\mathrm{Al}\mathrm{C}$ using $^{27}\mathrm{Al}$ NMR spectroscopy. The quadrupole splittings, Knight shifts, as well as spin-lattice relaxation ti…
We report a B3LYP study of a novel mechanism for propylene epoxidation using H(2) and O(2) on a neutral Au(3) cluster, including full thermodynamics and pre-exponential factors. A side-on O(2) adsorption on Au(3) is followed by dissociative addition of H(2) across one of the Au-O bonds (DeltaE(act) = 2.2 kcal/mol), fo…
Abstract A series of hybrid nanocomposite hydrogels, based on gelatin and intercalated hydrotalcite (IHT), crosslinked with glutaraldehyde, was prepared in this study. The microstructures of the IHT and sample gels were identified by X‐ray diffraction (XRD). Swelling behaviors and physical properties of these hybrid g…
A new and facile route is reported to manipulate the self-assembly synthesis of hierarchically ordered Rb-OMS-2 and pyrolusite with an interesting flowerlike morphology by a direct and mild reaction between rubidium chromateand manganese sulfate without any organic templates. The crystal forms, morphologies, and tunne…
Abstract The morphological and hydraulic properties of electrospun fiber webs were investigated and compared with those of spunbond nonwoven fabrics. In this study, poly(ethylene terephthalate) (PET), hydrophobic polymer, and nylon 6, with some hydrophilic groups (amide groups), were used as the polymer materials to p…