Materials Literature
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Efficient energy transfer in polymer blends, comprising a fluorene-based liquid-crystalline polymer (see Figure) and a non-liquid-crystalline photoluminescent polymer, is demonstrated. Low-threshold amplified spontaneous emission, originating from the efficient Förster-type energy transfer between the host and the gue…
We describe an alternating current method for the measurement of the longitudinal (Sxx) and transverse (Sxy, i.e., Nernst) thermopower of millimeter-size crystal samples at low temperatures (T<1 K) and high magnetic fields (B∼30 T). A low-frequency (33 mHz) heating method is used to increase the resolution and…
Abstract The reduction process of Cu–ZSM-5 was investigated by a time-resolved energy-dispersive XAFS (DXAFS) technique. The spectra were recorded every second and the entire spectra were analyzed to elucidate the dynamic change of the local structure around the Cu species. Two Cu–ZSM-5 samples with different Cu loadi…
Multilayer ultrathin films were obtained from phenolic shell-modified PAMAM dendrimers (G3.0) and diazo resin (DR) as building blocks via hydrogen bonding attraction using the deposition technique. Under UV irradiation, the nature of the linkage between layers converted from H-bonding to covalent, which increased the…
Polymers have been widely used for the protection of metals against corrosion and for improving the performance of structural adhesive joints. In this contribution, the weakness and short-term durability of these polymer−metal interactions and some common approaches for alleviating this problem are briefly reviewed. A…
The initiation of sporulation in Bacillus subtilis results primarily from phosphoryl group input into the phosphorelay by histidine kinases, the major kinase being kinase A. Kinase A is active as a homodimer, the protomer of which consists of an approximately 400-amino-acid N-terminal putative signal-sensing region an…
Degenerate epitaxial crystallization of a semicrystalline block terpolymer is utilized to alter the polymer's normal microdomain structure. It is demonstrated that the strong interaction created by crystallographic matching of unit cells between the crystalline polyethylene (PE) block and the anthracene substrate forc…
We examined the static axial displacement of a ceramic d 31 ‐gradient flextensional transducer both experimentally and theoretically. Two lead zirconate titanate systems, (PZT)/PZT and PZT/ZnO, were studied. The PZT/PZT transducers consisted of two PZT layers of different d 31 coefficients. The PZT/ZnO transducers con…
Spontaneous processes of polypyrrole (PPy) films in electrolyte solutions resulting from polymer oxidation by dissolved oxygen or polymer redox capacitance discharging and their influence on open circuit potentials were investigated. Chronopotentiometric and chronoamperometric methods were adapted to study these proce…
A series of silver compounds of empirical formula (β-diketanato)Ag(BTMSA) (where BTMSA is bis(trimethylsilyl)acetylene) were prepared from reactions of Ag2O with β-diketone in the presence of BTMSA. All these compounds were characterized by elemental analyses, nuclear magnetic resonance (NMR), and infrared (IR) spectr…
A set of four porphyrin trimers ( 1 − 4 ) consisting of an energy-accepting 5,15-diphenylethynyl-substituted Zn(II)-porphyrin core flanked by two energy-donating peripheral Zn(II)-porphyrins have been prepared as a new efficient energy-transfer functional unit. The peripheral porphyrin donor is either a TPP-type Zn(II…
To investigate the structural and thermodynamic basis of the binding of solvent at internal sites within proteins a number of mutations were constructed in T4 lysozyme. Some of these were designed to introduce new solvent-binding sites. Others were intended to displace solvent from preexisting sites. In one case Val-1…
We synthesized new polyaniline (PANI)/organoclay (aminosilane surface-treated) nanocomposite particles and prepared electro-rheological (ER) fluids by dispersing the particles in silicone oil. A distinct enhancement in yield stress was observed due to the presence of PANI-coated clay particles. The effects of delamina…
We have presented polarized photoluminescence (PL) from photopatterned discotic liquid crystal (DLC) film. Photopatterned DLC film was accomplished by the photoalignment technique consisting of oblique photoirradiation with nonpolarized light and the subsequent annealing of an azobenzene-containing polymer thin film.…
Using a tunneling approach for the field emission from a single carbon nanotube, expressions for the emission current as a function of the anode voltage and of the emitted electron energy spectrum are obtained. The low dimensionality of the electronic system of a carbon nanotube is taken into account. The extraction f…
The SH3 domain of Eps8 was previously found to form an intertwined, domain-swapped dimer. We report here a monomeric structure of the EPS8 SH3 domain obtained from crystals grown at low pH, as well as an improved domain-swapped dimer structure at 1.8 A resolution. In the domain-swapped dimer the asymmetric unit contai…
Syntactic foam products are most often made from glass microballoons embedded in a thermosetting polymer matrix, and they have good mechanical and thermal properties. However, the glass microballoons easily break in shear and are therefore very difficult to use for manufacturing methods that cause shearing of the mate…
The melting and crystallization behavior of random propene/higher linear α-olefin copolymers synthesized with the catalyst system (CH3)2Si(2-methylbenz-[e]indenyl)2ZrCl2/MAO were investigated. According to Flory's theory, the melting point depression is linearly related to the amount of comonomer incorporated irrespec…
A streamlined synthetic scheme was developed for the preparation of a novel series of cationically polymerizable epoxy-functional organic−inorganic hybrid resins. The reaction sequence consists, first, of the regioselective rhodium-catalyzed monoaddition of an α,ω-Si−H difunctional siloxane to a vinyl epoxide. The sec…
The polarization switching in Pb(Zr,Ti)O3 (PZT) ferroelectric bulk ceramics undoped and doped with Nb2O5 or Fe2O3 was studied by means of both hysteresis loops and transient current measurements at room temperature. The results obtained revealed that in PZT ceramics, during the poling process, the reorientation of the…