Materials Literature
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Abstract Surface waves are the fields that decay exponentially away from, but propagate along, a dielectric interface. In this paper, a dielectric waveguide is constructed with a grounded DNG metamaterial slab whose real parts of permittivity and permeability are both negative. Field solutions are then derived analyti…
Monte Carlo simulations are performed of adsorbed polymers with various polymer lengths N and adsorption energies χ s . Exchange times and the rates of lateral diffusion (along the surface) are investigated as a function of N and χ s . Lateral diffusion is found to be a combination of reptation (diffusion of stored le…
Various free radical surface initiated polymerization (SIP) conditions were investigated on clay nanoparticles coated with monocationic 2,2'-azobisisobutyronitrile (AIBN) type free radical initiators. Interesting differences in the mechanism of polymer nanocomposite product formation and the role of nanoparticle surfa…
We report a study of spin waves in ferromagnetic La1-xCaxMnO3, at concentrations x=0.17 and x=0.2 very close to the metallic transition (x=0.225). Below T(C), in the quasimetallic state (T=150 K), nearly q-independent energy levels are observed. They are characteristic of standing spin waves confined into finite-size…
We measured the growth velocities of the (110) face of tetragonal lysozyme, V (cm/s), at four different concentrations, c (mg/mL), as the solution temperature, T (°C or K), was reduced. For a broad range of T dependent on c, we find that the growth velocities increased as the solution temperature was reduced. The init…
Abstract With nucleophilic aromatic substitution and ester condensation reactions, several new first‐generation dendrimers and star‐shaped molecules containing cationic cyclopentadienyl iron moieties were prepared. Although the solubility of the organoiron star‐shaped molecules with ether bridges in polar solvents was…
Abstract Polyamide–polyester multiblock copolymers were synthesized through the reaction of α,ω‐dicarboxy polyamides and polyesters with various arylene bis(2‐oxazoline)s. 2,2′‐(2,6‐Pyridylene)bis(2‐oxazoline) was very reactive and yielded multiblock copolymers with number‐average molar masses ranging from 15,000 to 2…
Abstract Cellulose acetate butyrate (CAB)/ poly(butylene succinate) (PBS) blend films were prepared by using a cast blend method with chloroform. Homogenous blend films were obtained over a wide range of the blend ratio. The compatibility and physical properties of the blends have been investigated. The following conc…
Blends of poly[( R )-3-hydroxybutyrate] (PHB) and cellulose propionate (CP) with various compositions were prepared by the solvent-casting method, and their uniaxial drawing behavior was studied by means of two-dimensional wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). Although this syste…
The director structure around topological defects and in 2pi walls in the two-dimensional orientation field of thin freely suspended films of tilted chiral smectic liquid crystal is observed to minimize splay of the spontaneous polarization. Concentric ring patterns in the director field unwind more slowly in higher p…
Liquid crystal (LC) cells consisting of a very thin (submicrometer) nematic LC layer switch with time response smaller than 1ms. The total response time, i.e., sum of the turn-on and turn-off times, can be made as small as 1.3ms. Such devices were prepared by a photoinduced anisotropic phase separation of mixtures of…
Gd 2 O 3 : Eu 3 + and Li-doped Gd2O3:Eu3+ luminescent thin films have been grown on Si (100) substrates using pulsed-laser deposition. The films grown at different deposition conditions show different microstructural and luminescent characteristics. Both cubic and monoclinic crystalline structures were observed in bot…
Brewster angle microscopy (BAM) shows that a nonamphiphilic polyhedral oligomeric silsesquioxane (POSS) nanofiller, octaisobutyl-POSS, forms aggregates at all surface concentrations at the air/water interface. When amphiphilic poly(dimethylsiloxane) (PDMS) is blended with the octaisobutyl-POSS (>10 wt % PDMS), the deg…
Intrinsic factor (IF(50)) is a cobalamin (Cbl)-transporting protein of 50 kDa, which can be cleaved into two fragments: the 30 kDa N-terminal peptide IF(30) and the 20 kDa C-terminal glycopeptide IF(20). Experiments on binding of Cbl to IF(30), IF(20), and IF(50) revealed comparable association rate constants (k(+)(Cb…
Abstract An investigation of graft polymerization to determine the potential of a starch‐bonded acryloyl group as a suitable coupling agent with vinyl monomers was carried out. In this case, potassium persulfate was used as a free‐radical initiator using water as the reaction solvent for further graft polymerization.…
Abstract Summary: The synthesis of novel phosphorous‐containing aromatic polyethers P‐PEEK and P‐PSU, based on poly(ether ether ketone)s (PEEK) and poly(ether sulfone)s (PSU) was carried out successfully by using phosphorous‐containing aromatic diols instead of bisphenol A in the usual synthesis procedure. The molecul…
Abstract Magnetic poly(methyl methacrylate) (PMMA)/poly(methyl methacrylate‐ co ‐methacrylic acid) [P(MMA–MAA)] composite polymer latices were synthesized by two‐stage soapless emulsion polymerization in the presence of magnetite (Fe 3 O 4 ) ferrofluids. Different types and concentrations of fatty acids were reacted w…
Microcellular polymer, known as polyHIPE, which is synthesized by polymerization of high internal phase emulsion, has been associated with heterogeneous nucleation. In this issue, we have generated palladium nanoparticles in situ by an impregnation−reduction method. The nanoparticle synthesis is very sensitive to cond…
[reaction: see text] We describe the design, synthesis, and characterization of a family of thiol-reactive optical switches for labeling proteins and other biomolecules. Site-selective introduction of photochromic probes within biomolecules is being used as part of a new approach for optical control of biomolecular in…
Taking a nucleation perspective, we study the nature of the disordered micelles in highly asymmetric, sphere-forming diblock copolymer melts using the self-consistent-field theory. The micelles are shown to correspond to strong, activated, localized composition fluctuations in the disordered state due to finite molecu…