Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCrystal Structure of the Complex of β-Cyclodextrin with Bithiophene and Their Oxidative Polymerization in WaterYoshinori Takashima, Yoshihumi Oizumi, Kazuya Sakamoto, Masahiko Miyauchi, Shigehiro Kamitori, and Akira HaradaView Autho…
A steadily growing number of active pharmaceutical ingredients (API) exhibits low bioavailability and requires protection from enzymatic and acid-catalyzed degradation in the body. Therefore, the development of efficient carrier-based delivery systems is of increasing importance. Carrier systems based on liposomes, po…
This paper presents the results obtained using a genetic algorithm (GA) to search for stable structures of medium size silicon clusters. In this work the GA uses a semiempirical energy function to find the best cluster structures, which are further optimized using density-functional theory. For small clusters our resu…
Dissolution of carbonate minerals has significant environmental effects. Microorganisms affect carbonate dissolution rates by producing extracellular metabolites, including complex polysaccharides such as alginic acid. Using a combined atomic force microscopy (AFM)/flowthrough reactor apparatus, we investigated the ef…
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Spectroscopic properties of ${\mathrm{Ce}}^{3+}$ in ${\mathrm{Gd}}_{3}{\mathrm{Sc}}_{2}{\mathrm{Al}}_{3}{\mathrm{O}}_{12}$ have been investigated by high-pressure luminescence and absorption spectroscopy up to 200 kbar. The emission and absorption bands originating from $5d\ensuremath{\leftrightarrow}4f$ transitions w…
Laterally varying thickness gradients of poly(acrylic acid) (PAA) were formed by Zn(II)-catalyzed electropolymerization of acrylic acid (AA) in the presence of an in-plane electrochemical potential gradient applied to Au working electrodes. In the static potential gradient (SPG) approach, two ends of a Au working elec…
A soluble polyaniline (PANi) was synthesized by modifying with a photolabile, acid-labile, and thermolabile tert -butoxycarbonyl (t-BOC) group in this study. The prepared PANi(t-BOC) is highly soluble and thermodynamically stable in low-boiling solvents such as THF, dioxane, and CHCl 3 . This soluble form of PANi(t-BO…
Abstract An infrared spectroscopic method was used to follow the course of in situ polymerization of zinc dimethacrylate (ZDMA) in poly(α‐octylene‐ co ‐ethylene) elastomer (POE). The integral intensity of the 831 cm −1 band, ie the out‐of‐plane deformation mode of CH, was used to determine the residual amount of ZDMA…
We report the synthesis of four conjugated copolymers based on alkylated fluorene or phenylene units which band gap is tuned by the regular insertion of an electron-donating or electron-withdrawing unit, (3,4-ethylenedioxy)thiophene and pyridine, respectively. The (AB) n regular sequence is achieved by Suzuki polycond…
Xylose isomerase (E.C. 5.3.1.5) catalyzes the interconversion of aldose and ketose sugars and has an absolute requirement for two divalent cations at its active site to drive the hydride transfer rates of sugar isomerization. Evidence suggests some degree of metal movement at the second metal site, although how this m…
The optical properties of in situ deposited gold nanoparticle coatings are investigated for potential application in architectural glass. It is found that the optical properties of the coating can be controlled by the pH of the deposition solution. At a pH of 5.1, the color of the coatings develops from pink, through…
Dissolution of nanosized crystallites may be inhibited and even suppressed due to their small size. Nanoparticles with size distribution similar to that of critical dissolution pits (see picture) can be kinetically stabilized against further dissolution even in undersaturated solutions. In biological systems, this beh…
The adsorption properties of O(2) molecules on anionic, cationic, and neutral Au(n) clusters (n=1-6) are studied using the density functional theory (DFT) with the generalized gradient approximation (GGA), and with the hybrid functional. The results show that the GGA calculations with the PW91 functional systemically…
Amphiphilic pore walls facilitate reversible sorption of short-chain alcohols by the 1D microporous organic–inorganic hybrid [1-Na]3[PW12O40] assembled from calix[4]arene–Na+ complex 1-Na+ (R1=R2=H) and the polyoxotungstate anion [PW12O40]3−. The analogous assembly formed with 2-Na+ (R1=tBu, R2=CH2CO2Et) has a 3D micr…
We show that, in the athermal quasi-static deformation of amorphous materials, the onset of failure is accompanied by universal scalings associated with a \emph{divergence} of elastic constants. A normal mode analysis of the non-affine elastic displacement field allows us to clarify its relation to the zero-frequency…
Abstract The insertion reaction between 1 equiv. of carbodiimide, R′N=C=NR′, and the zinc bis(amide) [Zn{N(SiMe 3 ) 2 } 2 ] affords the homoleptic zinc( II ) guanidinate compounds [Zn{(Me 3 Si) 2 NC(NR′) 2 } 2 ] ( 3 , R′ = i Pr; 4 , R′ = Cy) in preference to the monosubstituted compounds. Compound 3 also results from…
Molecular organic materials offer the promise of novel electronic devices but also present challenges for understanding charge transport in narrow band systems. Low temperature studies elucidate fundamental transport processes. We report the lowest temperature field effect transport results on a crystalline oligomeric…
Molecular dynamics simulations have been used to study a collective atomic transport phenomenon by repeated Ar$^+$ irradiations in the Ti/Pt interfacial system. The ion-induced injection of surface atoms to the bulk, the ejection of bulk atoms to the top layers together with surface erosion is strongly enhanced by int…
We study the flow of model hard-sphere colloidal suspensions at high volume fraction Phi driven through a constriction by a pressure gradient. Above a particle-size dependent limit Phi(0), direct microscopic observations demonstrate jamming and unjamming-conversion of fluid to solid and vice versa-during flow. We show…