Materials Literature
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The competition between gelation and isotropic−nematic (I−N) phase separation in dispersions of moderately attractive sterically stabilized boehmite (AlOOH) rods is studied. Two different scenarios are observed. In one system I−N phase separation proceeds by slow sedimentation (syneresis) of a gel resulting in a weakl…
The first two series of Co-NO bond dissociation enthalpies in benzonitrile solution were determined for 12 cobalt(II) nitrosyl porphyrins and for 12 cobalt(III) nitrosyl porphyrins by titration calorimetry with suitable thermodynamic cycles. The results display that the energy scales of the heterolytic Co(III)-NO bond…
The new monomer 1,2- O -isopropylidene-3-benzyloxy-pentofuranose-4,4‘-cyclic carbonate (IPPTC) was prepared. IPPTC has both a ketal-protected diol and a benzyl ether-protected hydroxyl. Thus, these two sets of hydroxyl groups can be independently deprotected to give IPPTC repeat units with one, two, or three free hydr…
An investigation of the kinetics of tethering of amine functional-ended polystyrene from good solvent to the surface of a solid substrate showed three distinct regimes of kinetics rather than the two predicted by theory. The first regime was fast and appeared to be controlled by diffusion through the solvent, as predi…
To clarify the structure and species of rhodamine 6G (R6G) aggregates formed in taeniolite (TN) interlayer spaces, the oriented thin films of R6G−TN hybrid materials were prepared and analyzed. XRD investigations of these films indicated that the R6G molecules were intercalated in the TN interlayers and that the TN la…
A novel type of micrometer-sized entity containing silver was introduced. Three different approaches were employed to modify the colloidal particles with silver. According to the first technique, the particles were first coated with layers of poly(styrenesulfonate) and silver ions followed by the reduction of silver b…
The use of organic multidentate ligands to organize inorganic species is an effective method to prepare porous solids with tunable pore sizes. However, thus far, inorganic building units are generally limited to individual metal ions (e.g., Zn2+) or their oxide clusters (e.g., Zn4O6+). To expand applications of porous…
The photoinduced gelation system based on 1 (non-gelling) to 2 (gelling) molecular photoisomerization in water results by microspheres (1) to gel fibers (2) transformation at the supramolecular level.
Addition of 4,4'-bipyridyl to a solution of a meso-meso butadiyne-linked conjugated zinc porphyrin polymer in chloroform results in self-assembly of a double-strand ladder complex. Excess ligand causes this duplex to dissociate into single strands. These binding processes were elucidated by near-IR and NMR titrations,…
The rheological properties of gelatin gels from various sources (fish and mammalian) were followed in the course of the sol−gel transition and during gel maturation, by performing dynamic measurements under very small deformations. Different concentrations and molecular weights were investigated. The solvent was mainl…
The structure and chemical environment of Cu in Cu/CeO 2 catalysts synthesized by the solution combustion method have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) spectroscopy, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV)…
The results of a comparative study of hyperbranched, partially esterified polyglycerols with their linear polyglycerol analogues with respect to molecular encapsulation and phase transfer are reported. Two hyperbranched polyglycerol samples with molecular weights of 3000 and 8000 g/mol (Mw/Mn = 1.3), respectively, hav…
Novel sulfuric acid-functionalized mesoporous benzene-silicas with a molecular-scale periodicity in the walls were derived from the mesoporous benzene-silica possessing mercaptopropyl groups by the oxidative transformation of -SH into -SO3H.
Fiber identification has been a very important task in many industries such as wool growing, textile processing, archaeology, histochernical engineering, and zoology. Over the years, animal fibers have been identified using physical and chemical approaches. Recently, objective identification of animal fibers has been…
The compounds (bpy-dq)[Ni(CN)(4)].2H(2)O (1), (bpy-dq)[Pd(CN)(4)].2H(2)O (2), and ((bpy-dq)[Pt(CN)(4)].2H(2)O (3) (bpy-dq = (C(12)H(12)N(2))(2+), 6,7-dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium) and (phen-dq)[Ni(CN)(4)] (4), (phen-dq)[Pd(CN)(4)].H(2)O (5), and (phen-dq)[Pt(CN)(4)].H(2)O (6) (phen-dq = (C(14)H(12)N(2))…
The temperature dependence of the sharp and the broad component of the critical scattering above the cubic-to-tetragonal phase transition of ${\mathrm{SrTiO}}_{3}$ has been studied by means of high-resolution triple-crystal diffractometry using 100--200 keV synchrotron radiation in five samples differing with respect…
Abstract Spherical MgCl 2 adducts used as supports for a Ziegler–Natta catalyst for olefin polymerization were prepared by the general precipitation method. The influence of MgCl 2 /EtOH (mol/mol) and the dispersion speeds on the particle size (PS) and particle size distribution (PSD) were investigated. It was found t…
The hyperthermophilic archaeon Pyrococcus furiosus possesses a modified Embden-Meyerhof pathway, including an unusual ADP-dependent glucokinase (ADP-GLK) and an ADP-dependent phosphofructokinase. In the present study, we report the characterization of a P. furiosus galactokinase (GALK) and its comparison with the P. f…
Flexible printed circuitry (FPC) is a patterned array of conductors supported by a flexible dielectric film made of high strength polymer material such as polyimide. The flexibility of FPC provides an opportunity for three dimensional packaging, easy interconnections and dynamic applications. The polymeric core layer…
The reaction of the tetrachlorodisilane R 2 Si 2 Cl 4 (R = CH(SiMe 3 ) 2 ) with a mixture of H 2 O 2 /H 2 O/toluene resulted in the formation of the tetrahydroxydisilane R 2 Si 2 (OH) 4 . However the corresponding tetraaminodisilane R 2 Si 2 (NH 2 ) 4 reacted under the same conditions to yield a trihydroxycyclotrisilo…