Materials Literature
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Excited energy-transfer processes were investigated for a supramolecular Zn-porphyrin free-base porphyrin dyad, ZnPA-2 x FbPC-2, in which beta-octaalkylated meso-diarylporphyrins are connected through an amidinium-carboxylate salt bridge. The rate of energy transfer in the dyad (1.3 x 10(9) s(-1)) is substantially slo…
We investigate crystalline order on a two-dimensional paraboloid of revolution by assembling a single layer of millimeter-sized soap bubbles on the surface of a rotating liquid, thus extending the classic work of Bragg and Nye on planar soap bubble rafts. Topological constraints require crystalline configurations to c…
Smooth muscle cells (SMC) were cultured for up to 6 days on copolymer films fabricated from a PCL-PEG-PCL block copolymer or P(epsilon-CL-co-D,L-LA)-PEG-P(epsilon-CL-co-D,L-LA), named P(100/0) and P(70/30), respectively. The films were modified by aminolysis using 1,6-hexanediamine, and fibronectin, fibrinogen, or fib…
Abstract Demixing/recombination and metastability phenomena are observed in the La 2–2 x Ca 2 x Mo 2 O 9– x solid solutions ofLAMOX‐type fast oxide‐ion conductors (0.005 ≤ x ≤ 0.05). The demixing process is more visible at high Ca content. The effects of composition, sample shape (powders with twodegrees of fineness,…
First-principles calculations have been conducted to systemically investigate the stability and magnetic properties of 3d and 4d transitional-metal (TM) atoms doped in the BnNn (n=12,16,20,24,28) cages. Among those cages, the B24N24 is the optimal one for encapsulating 3d and 4d TM atoms according to the computed heat…
Abstract The proper condensation temperatures of nanosilica powder modified by silane coupling agents such as 3‐methacryloxypropyl trimethoxy silane (MEMO), [3‐(2‐aminoethyl)aminopropyl] trimethoxy silane (AMMO), and bis[3‐(triethoxysilyl)propyl] disulfide (TESPD) were measured with Fourier transform infrared. Moreove…
The complexation of Keggin-type polyoxometalate [alpha-SiW 12O 40] (4-), macrocation [Cr 3O(OOCC 2H 5) 6(H 2O) 3] (+), and monovalent cation A (+) forms ionic crystals of A 2[Cr 3O(OOCC 2H 5) 6(H 2O) 3] 2[alpha-SiW 12O 40]. nH 2O [A = Na ( 1a), K ( 2a), Rb ( 3a), NH 4 ( 4a), Cs ( 5a), and tetramethylammonium (TMA) ( 6…
We investigate the time-dependent Kondo effect in a single-molecule magnet (SMM) strongly coupled to metallic electrodes. Describing the SMM by a Kondo model with large spin S>1/2, we analyze the underscreening of the local moment and the effect of anisotropy terms on the relaxation dynamics of the magnetization. Unde…
Abstract Surface‐functionalization chemistries were optimized to tailor the surface chemistry of polyethylene, and this made covalent attachment of bioactive molecules possible. This concept has relevance in biomaterials, biosensors, textiles, and active food‐packaging applications. Clean polyethylene films were subje…
Abstract A series of activated urethane‐type derivatives of α‐amino acids were synthesized and applied to polypeptide synthesis. The urethane used herein, N ‐(4‐nitrophenoxycarbonyl)‐α‐amino acids 1 , were synthesized by N ‐carbamoylation of γ‐benzyl‐ L ‐glutamate, β‐benzyl‐ L ‐aspartate, L ‐leucine, L ‐phenylalanine,…
This is a report on the electrochemical and optical properties of a new type of linked system of ferrocene (Fc) and viologen (V 2+ ) units, Fc−(CH 2 ) 4 −V 2+ −R (Fc−V 2+ ). The cyclic voltammogram and absorption spectra have revealed that Fc and V 2+ units are little effected by the nonconjugated bridge, −(CH 2 ) 4 −…
The structures and stabilities of (Al2O3)n (n = 1-10 and 30) clusters were studied by means of first principles calculations. The calculated results reveal that the global minima of small (Al2O3)n (n = 1-5) clusters are cage structures with high symmetries, in which Al and O atoms are three- and two-coordinated, respe…
The site-specific reaction of tetrairon(III) propeller-like clusters with tripodal ligands derived from 2-hydroxymethyl-propane-1,3-diol was investigated as a route to graft these single molecule magnets (SMMs) on Si(100). A silicon surface prefunctionalized with a long-chain trimethylol derivative was reacted with [F…
Carbon-embedded or -supported platinum clusters (1−12 wt % Pt) were made rapidly by a scalable, single-step flame spray pyrolysis (FSP) process. Pt-containing precursors dissolved in xylene were sprayed and combusted in a controlled oxidation atmosphere resulting in nanostructured, carbon-embedded Pt clusters. Reversi…
A self-assembled fiber of a perfluoroalkyl chain-containing organogelator can be an effective template for a direct synthesis of fluorocarbon-functionalized silica nanotubes through the aggregation of perfluoroalkyl chains between the gelator and a fluorocarbon-functionalized alkoxysilane.
Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx), a polyester with strong mechanical properties and biocompatibility, is a member of microbial polyhydroxyalkanoates (PHA) family. Maleic anhydride was used to graft PHBHHx to form maleated PHBHHx (Ma-PHBHHx). Ma-PHBHHx with a graft degree of 0.59% was found to be…
Abstract Polyesters PEs containing high content of fluorene units in their backbones were synthesized from 9,9‐diarene‐substituted fluorene diols ( 1 ) and fluorene‐based diacid chlorides ( 2 ) by high temperature polycondensation at 185 °C in diphenyl ether. The molecular weights of the polyesters PE1‐PE5 were in a r…
The dynamics of the host-sensitized excitation of the high-lying $^{6}G$ state of ${\mathrm{Gd}}^{3+}$ in $\mathrm{Sc}\mathrm{P}{\mathrm{O}}_{4}$ is studied as a function of temperature. Excitation of the ${\mathrm{Gd}}^{3+}$ $^{6}G$ state has been shown to lead to quantum cutting by photon cascade emission in $\mathr…
A universal asymptotically exact theoretical approach elucidating the origin of the depletion stabilization phenomenon is developed. The theory predicts that colloidal particles in a semidilute polymer solution may be kinetically stabilized by a long-range polymer-induced repulsion. It is shown that the repulsion is d…
Nature is able to produce large single crystals with complex shape via amorphous precursor phases in the process of biomineralization (the picture shows an SEM image of a fracture surface of a sea urchin spicule). This strategy can be mimicked for the template synthesis of large single-crystalline materials with contr…