Materials Literature
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Size-dependent phase transition of nanosize diamond particles (NDPs) to graphite was found in the course of studies of high pressure high temperature (HPHT) induced transformations of NDPs at 8 GPa and in the temperature range of 873−1623 K. Analysis of the products of HPHT treatment of powder NDPs (with the mean size…
All-electron calculations based on density functional theory have been carried out to study the electronic structures of single-walled nanotubes with subnanometer diameters. Present studies suggest the need for performing all-electron calculations, specifically for the nanotubes with very small diameters. Complete geo…
One-at-a-time stereochemistry: AsS bond-making and bond-breaking reactions are important in pharmacology, toxicology, and cell biology. The aqueous covalent chemistry of individual AsIII molecules can be monitored inside a protein nanoreactor. The approach is used to follow the creation of a chiral center at AsIII, t…
The synthesis of the first pi-extended tetrathiafulvalene (TTF) ligand featuring a furanoquinonoid spacer and pyridyl functional groups is described. This compound shows an unprecedented electrochemical sensing behavior and excellent coordinating properties toward selected divalent metal ions. Solid-state structures o…
The system constituted by the $\mathrm{Si}(001)\text{\ensuremath{-}}2\ifmmode\times\else\texttimes\fi{}1$ surface exposed to water molecules at room temperature has been chosen to single out the electron structure of the hydroxyl SiOH, a surface species playing an important role in many technologically relevant proces…
The solubilities of clindamycin phosphate in different solvents were measured using a static method. The RP-HPLC was used to determine the concentration of clindamycin phosphate in the liquid phase. The solubility data were correlated with the combined nearly ideal binary solvent (CNIBS)/Redlich−Kister equation which…
The effect of a 20‐nm thick TiO 2 seeding layer on the growth of a Bi 3.15 Nd 0.85 Ti 3 O 12 (BNT) thin film on Pt(111) thin‐film substrates has been studied. Under otherwise identical deposition process conditions, the BNT film could be turned from a highly random orientation to a (200) preference orientation by addi…
Abstract The processing and structural effects occurring in a poly(vinyl chloride) (PVC) compound processed in a plastograph, at the time at which the maximum value of the torque (point X on the torque curve) was reached, were studied. The unplasticized PVC compound was processed at various temperatures (150–200°C) wi…
Abstract Cross polarisation/magic angle spinning 13 C NMR spectroscopy has been used to study structural changes in cellulose induced by the dissolving pulp process. The cellulose structure in several dissolving pulps was investigated for commercial and laboratory cooked Eucalyptus 92α and 96α. The average lateral dim…
We have carried out a thorough study of the electron exchange reaction between 2,5-dimercapto-1,3,4-thiadiazole (DMcT) and the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), which dramatically accelerates the redox reactions of DMcT at room temperature. A qualitative analysis of the electron exchange rea…
Different forms of pi-conjugated polyarylmethyl systems, such as diradicals, polyradicals, spin clusters, and polymers, were studied with valence bond (VB) calculations within the density matrix renormalization group (DMRG) framework. For these systems, the energy gap between the high-spin ground state and the lowest…
Large amplitude oscillatory shear (LAOS) is frequently capable of generating macroscopic alignment from an initially random orientation distribution in ordered polymer fluids. Side-group liquid crystalline polymers are of special interest in that the flow field may couple differently to the polymer backbone and the me…
Metallic carbon nanotubes (CNTs) are promising as transmission lines or interconnects in radio-frequency nanoelectric circuits. This paper presents passive network properties of individual multi-walled carbon nanotubes (MWNTs) up to 110 GHz measured at room temperature. From the S-parameter data, frequency-dependent e…
Abstract Aromatic polyesters containing biphenyl side groups were synthesized by phase‐transfer catalyzed interfacial polycondensation of 1‐(4‐biphenylyl)‐1,1‐bis(4‐hydroxyphenyl) ethane (BBHPE) with terephthaloyl chloride (TPC), isophthaloyl chloride (IPC), and a mixture of TPC/IPC (50 : 50 mol ratio). Copolyesters w…
A facile dry route electrostatic-force-directed assembly (ESFDA) was used to deposit silver nanocrystals onto the external surface of vertically aligned multiwalled carbon nanotubes (MWCNTs). Charged and nonagglomerated aerosol silver nanocrystals were first produced using a mini-arc plasma source. The nanocrystals we…
We prepared polymeric structures with unusual complexity in surface morphology derived from photocurable emulsion droplets dispersed in an aqueous medium. The emulsion droplets a few tens of micrometers in size were stabilized with relatively small hydrophobic particles that were bound to the emulsion interfaces. The…
The charge density wave distortions of the square nets of tellurium in AMRE Te 4 ( A = K, Na; M = Cu, Ag; RE = La, Ce) and RE Te 3 are influenced by the degree of separation and interaction of the tellurium nets. Each combination of A - M - RE in this family generates a unique CDW pattern.
Core-cross-linked polyion complex (PIC) micelles entrapping trypsin in the core were prepared by mixing trypsin and poly(ethylene glycol)-block-poly(alpha,beta-aspartic acid) in aqueous medium, followed by the introduction of glutaraldehyde cross-linkages. Trypsin incorporated into the core-cross-linked micelles showe…
Hyaluronan (HA) derivatives containing thiol-reactive electrophilic esters were prepared to react with thiol-modified macromolecules to give cross-linker-free hydrogels. Specifically, HA was converted to two haloacetate derivatives, HA bromoacetate (HABA) and HA iodoacetate (HAIA). In cytotoxicity assays, these reacti…
The symmetry conditions for the development of a macroscopic electrical polarization as a secondary order parameter to a magnetic ordering transition and the constraints on the direction of the polarization vector are determined by a nonconventional application of the theory of irreducible corepresentations. In our ap…