Materials Literature
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Abstract p‐Type conduction in amorphous oxide was firstly found in zinc rhodium oxide (ZnO·Rh 2 O 3 ) ( Adv. Mater. 2003 , 15 , 1409), and it is still the only p‐type amorphous oxide to date. It was reported that an ordered structure at the nanometer scale was contained and its electronic structure is not clear yet. I…
Abstract Summary: A convenient three‐step strategy has been developed for the preparation of well‐defined amphiphilic, linear‐hyperbranched block copolymers by hypergrafting. The synthetic procedure is based on a combination of carbanionic polymerization with the alkoxide‐based, controlled ring‐opening multibranching…
Abstract Summary: Polyethylene‐alumina nanocomposites were prepared using in situ polymerization. Alumina nanomers were prepared by treating alumina nanoparticles with an alkylaluminium compound and a vinyl alcohol. This approach led to (a) grafting double bonds onto the alumina surface, and (b) dispersion of alumina…
The theory of semiclassical carrier transport in semiconducting single-walled carbon nanotubes is presented. The focus is on transport in response to a small, axially applied field. Carriers are considered to scatter with longitudinal, torsional, and radial breathing acoustic phonons. Theory predicts large mobilities…
Abstract 1,4‐Bis[2‐(3,4‐ethylenedioxy)thienyl]‐2,5‐bis[6‐(1′‐butyl‐4,4′‐bipyridyl)hexyloxy]benzene tetrahexafluorophosphate (BEDOTPh‐2V) was synthesized and electropolymerized to form a viologen‐bearing conductive polymer [P(BEDOTPh‐2V)] film on an electrode surface. This polymer exhibits multicolor electrochromic beh…
Abstract Four compounds of the Bi 4 Ti 3 O 12 /BiFeO 3 system with the formula Bi 2 Bi n−1 (Ti,Fe) n O 3n+3 , n = 3, 4, 4.5 and 6 were studied using high‐temperature X‐ray powder diffraction and differential thermoanalysis methods. The crystal structure of the n = 6 phase was refined by the Rietveld method. An unusual…
Abstract In the field of thin‐layer‐structured inorganic nanotubes, morphological, structural, and chemical/physical modifications induced in synthetic stoichiometric chrysotile nanotubes have been evaluated as a function of the extent of Fe doping. Fe‐doped synthetic chrysotile nanocrystals have been obtained in the…
Abstract Polymer‐dispersed liquid crystals (PDLCs) are liquid‐crystal dispersions within a polymer matrix. These films can be changed from an opaque to a transparent state by applying a suitable alternating‐current electric field. PDLCs have attracted the interest of researchers for their applications as light shutter…
Free-volume theory for understanding depletion phenomena in mixtures of two species is generally derived using scaled-particle theory for those specific entities. Here we first give a general scaled-particle method for convex bodies in terms of the characteristic geometrical measures of the depletion agent, i.e., its…
In this paper, we describe the second-order nonlinear optical properties of a series of 1,3-dithiole-based electron donor-acceptor systems incorporating proaromatic donor and spacer groups. Modification of the proaromaticity of the quinoid spacer gives rise to NLO-phores with mubeta values ranging from -2000 x 10(-)(4…
Rochelle salt (RS) $(\mathrm{Na}\mathrm{K}{\mathrm{C}}_{4}{\mathrm{H}}_{4}{\mathrm{O}}_{6}∙4{\mathrm{H}}_{2}\mathrm{O})$ single crystals were grown inside an array of alumina pores having an average diameter of $30\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and length of about $0.5\phantom{\rule{0.3em}{0ex}}\ensuremath{\m…
We present the first data and theory for the bias magnetic field dependence of magnetoelectric coupling in the electromechanical resonance (EMR) region for ferromagnetic-piezoelectric heterostructures. Trilayers of Permendur, a $\mathrm{Co}\ensuremath{-}\mathrm{Fe}\ensuremath{-}\mathrm{V}$ alloy, and lead zirconate ti…
${\mathrm{YMnO}}_{3}$ has an antiferromagnetic transition at 76 K with a ferroelectric transition at much higher temperature, making it a rare example of systems having both ferroelectric and magnetic transitions and thus a so-called multiferroic compound. Through high-resolution neutron diffraction studies, we have d…
In this letter, we show for the first time the use of metal oxides as catalysts in the synthesis of single-walled carbon nanotubes (SWCNTs) using laser ablation. Further, SWCNTs have been synthesized at low temperature (down to room temperature), where their nucleation cannot be explained via fullerene nucleation. The…
A series of linear ionomeric polyurethanes were synthesized and obtained as stable aqueous dispersions using various amounts (ca. 6−20%) of a diol functionalized polyhedral oligomeric silsesquioxane (POSS) comonomer. Polymers were characterized by GPC, XRD, DSC, dynamic rheology, and contact angle measurements. POSS m…
Colloidal crystallization of nanoparticles with different functionalities into multicomponent assemblies provides a route to new classes of ordered nanocomposites with novel properties tunable by the choice of the constituent building blocks. While theories based on hard sphere approximation predict crystallization of…
A single-step, nondestructive, and versatile technique for the grafting and chemical surface modification of biodegradable polymers such as polylactide is described. The substrates are subjected to the vapor phase of any of three investigated vinyl monomers: acrylamide, maleic anhydride, and N-vinylpyrrolidone, and gr…
Polyfluorenes ( P1 and P2 ) with phosphonate groups in the side chains were designed and synthesized. Their absorption and photoluminescence spectra in solutions are solvent dependent and exhibit a red shift up to 14 and 6 nm, respectively, with increasing solvent polarity. The polymers are highly soluble in ethanol w…
The local environment of Bi and Ti atoms in the lead-free relaxor ferroelectric solid-solution ${({\mathrm{K}}_{x}{\mathrm{Na}}_{1\ensuremath{-}x})}_{0.5}{\mathrm{Bi}}_{0.5}\mathrm{Ti}{\mathrm{O}}_{3}$ has been studied as a function of K concentration and as a function of temperature for the $x=0$ end member by x-ray…
Abstract The crystal structure of a ternary Er(DBM) 3 phen complex (DBM = dibenzoylmethane; phen = 1,10‐phenanthroline) and its in‐situ synthesis via a sol–gel process are reported. The infrared (IR), diffuse reflectance (DR), and fluorescence spectra of the pure complex and the Er 3+ /DBM/phen co‐doped luminescent hy…