Materials Literature
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New thiolytically cleavable dithiobenzyl (DTB) urethane-linked conjugates of methoxypoly(ethylene glycol) (mPEG) and a model protein, lysozyme, were prepared and thoroughly characterized. In contrast to our earlier communication [Zalipsky, et al. (1999) Bioconjugate Chem. 10, 703], in the current study we used a more…
Surface-initiated atom transfer radical polymerization (ATRP) of methoxypoly(ethylene glycol) methacrylate (MPEGMA) macromonomers from immobilized initiators leads to thin films of comblike polymer brushes. The aqueous ATRP procedure results in essentially constant film growth rates and yields coatings with thicknesse…
Organosilicon compounds can form novel electrolytes having a number of unusual properties, including high electrochemical stability, high thermal stability, and low viscosity. Vertically aligned carbon nanofibers can act as exceptionally good nanostructured electrodes, with the vertical orientation and presence of edg…
Poly{(+)-2,5-bis[4-(( S )-2-methylbutoxy)phenyl]styrene} (PMBPS) and its random copolymers with polystyrene were synthesized via atom transfer radical polymerization and conventional radical copolymerization, respectively. The dependences of thermotropic and chiroptical properties on the degrees of polymerization (DPs…
A size distribution of a binary mixture of polystyrene- block -poly(4-vinylpyridine) (PS−P4VP) diblock copolymer micelles was investigated mainly by transmission electron microscopy. A single-layered film of PS−P4VP micelles fabricated by spin-coating enabled a precise measurement of the micellar size. Depending on th…
The interfacial structures of the iPP/PET matrix/fiber composite systems prepared by introducing the PET fiber into the iPP melt or supercooled melt were studied via optical and scanning electron microscopies. We found that unlike the iPP matrix/fiber single polymer composites prepared in the same way, where homoepita…
A smart contrast agent for magnetic resonance imaging (MRI) can be used to exploit an enzymatic activity specific to the tissue or disease state signified by converting an MRI-inactivated agent to an activated MRI agent. In this study, a beta-galactopyranose-containing gadolinium(III) complex [Gd(DOTA-FPG)(H 2O)] was…
Quantum chemical calculations at the DFT level have been carried out for trans -[Ru II (NH 3 ) 4 (L)NO] q and trans -[Ru II (NH 3 ) 4 (L)NO] q -1 complexes, where L = NH 3, Cl -, and H 2 O. The equilibrium geometries and the vibrational frequencies are reported not only for the ground state (GS) but also for light-ind…
Long, homogeneous fiberlike SBA-15 mesoporous silica particles are prepared by fine adjustment of three reaction conditions--stirring temperature, stirring time, and amount of inorganic salt added--using Pluronic P123 and TEOS under acidic conditions. The addition of NaCl along with a short stirring time played an imp…
A direct calorimetric measurement of the dependence of the surface enthalpy of nanophase ZnO on morphology is reported. Nanoparticles, nanoporous composites, nanorods, and nanotetrapods were prepared with various sizes, and their surface enthalpies were derived from their drop solution enthalpies in molten sodium moly…
Cassie-Baxter theory has traditionally been used to study liquid drops in contact with microstructured surfaces. The Cassie-Baxter theory arises from a minimization of the global Gibbs free energy of the system but does not account for the topology of the three-phase contact line. We experimentally compare two situati…
We analyze the entanglement of polymer brushes embedded in long-chain melts and in good and ϑ solvents. Individual entanglements are identified using a modified version of primitive path analysis. Due to entropic collapse, the brushes embedded in the melt are more self-entangled than those in the implicit solvents. Th…
Sophorolipids are a class of glycolipids that can be obtained from fatty acids by simply treating them with yeast cells (Candida bombicola, ATCC 22214) and glucose. In this letter, we demonstrate the application of sophorolipids obtained from oleic acid as a capping agent for Co nanoparticles. Upon capping the nanopar…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTAnisotropic Ion Conductivity in Liquid Crystalline Diblock Copolymer Membranes with Perpendicularly Oriented PEO Cylindrical DomainsJingze Li, Kaori Kamata, Motonori Komura, Takeshi Yamada, Hirohisa Yoshida, and Tomokazu IyodaView Autho…
We analyze dynamics of 3D coreless vortices in superfluid films covering porous substrates. The 3D vortex dynamics is derived from the 2D dynamics of the film. The motion of a 3D vortex is a sequence of jumps between neighboring substrate cells, which can be described, nevertheless, in terms of quasi-continuous motion…
We report actuation and detection of gigahertz-range resonance frequencies in nano-crystalline diamond mechanical resonators. High order transverse vibration modes are measured in coupled-beam resonators exhibiting frequencies up to 1.441 GHz. The cantilever-array design of the resonators translates the gigahertz-rang…
DFT calculations on the spin-crossover complex Fe(salen)(NO) provide a striking illustration of the comparative performance of different exchange-correlation functionals vis-à-vis the issue of transition metal spin state energetics. Thus, although the "classic" pure functionals PW91 and BLYP favor the S = 1/2 state by…
The polarizability measures how the system responds to an applied electrical field. Computationally, there are many different ways to evaluate this tensorial quantity, some of which rely on the explicit use of the external perturbation and require several individual calculations to obtain the full tensor. In this work…
For ferromagnet/antiferromagnet bilayers, rotation of the easy axis has been \textit{for the first time} observed during measurements of training effect and the recovery of exchange bias using FeNi/FeMn system. These salient phenomena strongly suggest irreversible motion of antiferromagnet spins during subsequent meas…
We developed means to form multilayer superstructures of large collections of single-walled carbon nanotubes (SWNTs) configured in horizontally aligned arrays, random networks, and complex geometries of arrays and networks on a wide range of substrates. The approach involves guided growth of SWNTs on crystalline and a…