Materials Literature
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Under UV irradiation, poly(vinyl cinnamate) (PVCi) films undergo cross-linking due to [2 + 2] photocycloaddition between cinnamoyl groups. Consequently, electronic configuration of lateral polymer groups changes and also leads to the drop of the refractive index in the visible range. This mechanism is studied with reg…
Mechanical properties of melt-spun and postdrawn isotactic polypropylene (iPP) are studied to examine the dependence on the temperature in the postdrawing stage. In accordance with the literature, the Young's modulus is uniquely determined by the applied draw ratio. However, in contrast to the literature, we found tha…
The synthesis of new donor-acceptor acetylene-bridged compounds was realized via organophosphorus reactions and Sonogashira couplings. These systems exhibit high fluorescence quantum yields, and excitation induces very efficient charge redistribution in the molecules. [structure: see text]
Vinyl polymers incorporating a crowned spirobenzopyran moiety at the side chain were synthesized, and their alkali metal-ion complexation, photochromism, and photoresponsive ion-conducting behaviors were studied in comparison with similar polymers incorporating crown ether and spirobenzopyran moieties independently. T…
Chain mobility in a near surface region at a polystyrene/vacuum interface was investigated by embedding of noble metal nanosized clusters. The embedding process was monitored in situ by X-ray photoelectron spectroscopy. The embedding of nanosized clusters needs long-range chain mobility of the polymer . Therefore, the…
Two-photon polarization fluorescence microscopy is used to study the nature of the emission and nonlinear absorption dipole of single CdSe/ZnS quantum rods. Rods showed strongly polarized nonlinear excitation with sharp angular dependence, following a cos 4 (φ) functional form, in agreement with the predicted two-phot…
Multinuclear ( 13 C, 29 Si, 27 Al, 1 H) solid-state NMR spectroscopy and EPR and FT IR experiments are employed to investigate the thermolysis of aluminum-modified poly(hydridovinylsilazane), [Al(C 2 H 4 −SiHNH) 3 ] n, from which Si−Al−C−N ceramics can be formed. In addition, a comparative study is provided for differ…
This paper describes the synthesis and curing of cross-linkable polynaphthols from renewable resources. Naphthol monomers bearing an unsaturated group from renewable triglyceride oils were designed and oxidatively polymerized to produce new cross-linkable precursor polymers. The monomers were prepared by acylation of…
The interaction of SO 2 with ceria−zirconia model catalysts was studied using high-resolution synchrotron-based X-ray photoelectron spectroscopy (XPS). Epitaxial Ce 1 - x Zr x O 2 (111) ( x = 0.1 and 0.3) thin films (500−700 Å in thickness) were grown by oxygen-plasma-assisted molecular beam epitaxy on single-crystal…
Emulsifying action of high-frequency acoustic waves was investigated on surfactant-free oleic acid/water mixtures using megasonic irradiation (200 kHz and 1 MHz) in baths manufactured for precision cleaning. While the droplet size distribution was bimodal for single irradiation at 40 kHz or 1 MHz, a unimodal distribut…
A new molecule has been designed, synthesized, and utilized as molecular memory for optical storage capable of write, erase, and readout without simultaneously effacing the stored informtion. This molecule is composed of a photochromic fulgimide and a fluorescent dye bonded, chemically, together to form a single molec…
We performed mechanical tests on a matrix-free keratin model-hagfish slime threads-to test the hypothesis that intermediate filaments (IFs) in hydrated hard alpha-keratins are maintained in a partly dehydrated state. This hypothesis predicts that dry IFs should possess mechanical properties similar to the properties o…
This paper is devoted to investigating the physically interesting optical and electromagnetic properties, phenomena and effects of wave propagation in the negative refractive index materials, which is often referred to as the {\it left-handed media} in the literature. This paper covers a wide range of subjects and rel…
Abstract Poly(vinyl alcohol‐ co ‐vinyl acetate) was functionalized by methacrylic anhydride to introduce functional groups by a new process that consisted of modifying a polymer directly from a powder form in the solid state. To favor the diffusion of the reagents, a swelling agent composed by a mixture of ethylene ca…
Measurements of bulk conductivity and dielectric relaxation processes by ac methods including complex-plane impedance analyses have been carried out on insulating , together with measurements of four-probe dc conductivity and magnetic susceptibility, so as to investigate the correlation between bulk conduction and sho…
The formation of biocomposite films of the industrially important enzyme invertase and fatty lipids under enzyme-friendly conditions is described. The approach involves a simple beaker-based diffusion protocol wherein invertase diffuses into the cationic lipid octadecylamine during immersion of the lipid film in the e…
Understanding the deposition of liquid droplets on surfaces is essential in many environmental and industrial processes. In this paper, we describe computer simulations of homogeneous deposition of liquid droplets on an ideal, smooth, and horizontal solid surface. The statistical evolution of droplet deposition and gr…
The effect of temperature and glucose binding on the structure of the galactose/glucose-binding protein from Escherichia coli was investigated by circular dichroism, Fourier transform infrared spectroscopy, and steady-state and time-resolved fluorescence. The data showed that the glucose binding induces a moderate cha…
In this report new PPV-PPE copolymers <b>DE 69, DE 11</b> were compared with the state of the art materials <b>MDMO-PPV</b> and poly(3-alkylthiophenes) (<b>P3DDT, P3OT</b>). The optical band gap energy of the two copolymers <b>DE 69, DE11</b> is somewhat higher than that one of <b>MDMO-PPV</b>. The electrochemical ban…
Mixed surfactant-polyelectrolyte multilayer films were fabricated by both ionic self-assembly and spin assembly. A polycation [PEI = poly(ethylenimine)] was deposited from a dilute solution, while a polyanion (PAZO = poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt]) was deposit…