Supercritical Fluid Synthesis of Metal and Semiconductor Nanomaterials
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Controlled degradation of cured natural rubber by encapsulated benzophenone as a photosensitizer
Abstract The photodegradation of raw natural rubber and natural rubber compound film were studied using an artificial solar energy simulator. The properties of degraded rubber sheets containing benzophenone (BP) were determined by solution viscosity, 1 H‐NMR, and FTIR analyses. In the case of rubber compounds containi…
TTF‐TCNQ Functionalized Ormosil Based Electrocatalytic Biosensor: A comparative study on Bioelectrocatalysis
Abstract A novel electrocatalytic biosensor for glucose is reported that incorporate encapsulation of tetrathifulvalene‐tetracyanoquinodimethane (TTF‐TCNQ) functionalized organically modified sol gel glass (ormosil). The new ormosil is made using palladium‐linked glycidoxypropyltrimethoxysilane precursor, trimethoxysi…
Solidification and convection of a ternary solution cooled from the side
Results of an experimental study on the solidification and convection of a ternary solution of H $_2$ O–CuSO $_4$ –Na $_2$ SO $_4$ when cooled from a vertical side boundary are presented. Cooling and crystallization at a sidewall result in the formation of horizontal gradients of composition and temperature which are…
Polyelectrolyte Multilayer Films Containing Ferrocene: Effects of Polyelectrolyte Type and Ferrocene Contents in the Film on the Redox Properties
Abstract Electrochemical properties of Fc‐PEM films have been studied by changing the chemical structure of the polymer chains and the content of Fc moiety in the film systematically. We have prepared a series of PEM films by a layer‐by‐layer deposition of polycations, Fc‐modified poly(allylamine) (Fc‐PAA) and poly(et…
Study on polyethylene glycol/polydimethylsiloxane mixing soft‐segment waterborne polyurethane from different mixing processes
Abstract The surface structure and physical properties of polyethylene glycol series polyurethane (PEG‐PU) membranes, in which were introduced hydrophobic polydimethylsiloxane (PDMS) component by the procedure of PU blending or of soft‐segment copolymerization, were studied in this investigation. In the case of the bl…
Upgrading of MUF polycondensation resins by buffering additives. II. Hexamine sulfate mechanisms and alternate buffers
Abstract Iminoamino methylene bases intermediates are obtained by the decomposition of hexamethylenetetramine (hexamine). These are stabilized by the presence of strong anions such as SO and HSO , that is, “hexamine sulfate.” The effect of hexamine sulfate was closely linked to the strong buffering action it has on MU…
Interfacial Tension of Liquid Crystalline Droplets
The interfacial tension between two low-molar-mass biphenylcarbonitriles that exhibit liquid crystalline phases (4‘-pentyl-4-biphenylcarbonitrile and 4‘-octyl-4-biphenylcarbonitrile) and poly(dimethylsiloxane) was measured as a function of temperature using pendant drop tensiometry enhanced by video-image digitization…
Bogomol’nyi, Prasad, and Sommerfield Configurations in Smectics
It is typical in smectic liquid crystals to describe elastic deformations with a linear theory when the elastic strain is small. In smectics, certain essential nonlinearities arise from the requirement of rotational invariance. By employing the Bogomol'nyi, Prasad, and Sommerfield decomposition and relying on boundary…
Serendipitous Isolation of the First Example of a Mixed-Valence Samarium Tripyrrole Complex
The transamination reaction of Sm{N(SiMe 3 ) 2 } 2 (THF) 2 with two dipyrrole ligands of formula RR‘C(α-C 4 H 3 NH) 2 (R = R‘ = Et; R = Me, R‘ = Ph) has been examined. The reactions in THF and under N 2 gave two similar tetranuclear dinitrogen complexes, {[Et 2 C(α-C 4 H 3 N) 2 Sm} 4 (THF) 2 ](μ-N 2 )·2THF and [{[(C 6…
Enhancement of band-edge photoluminescence of bulk ZnO single crystals coated with alkali halide
We have studied coating effects of bulk ZnO crystal by means of photoluminescence (PL) measurements. Bulk crystal surface of ZnO is once covered by the melt of alkali halide at high temperature and is coated with thin alkali halide crystal. At low temperature, band-edge PL intensity of the ZnO crystal coated with KCl…
Control of Stepwise Radial Complexation in Dendritic Polyphenylazomethines
The fourth generation of a dendritic polyphenylazomethine (DPA G4) has 2, 4, 8, and 16 imine groups in the first, second, third, and fourth shells, respectively (total, 30 imine groups). DPA G4 can trap 30 equiv of SnCl(2) molecules, because the imine group is complexed with SnCl(2) at a ratio of 1:1. During addition…
Synthesis of iron‐containing polysilazane and its antioxidation effect on silicone oil and rubber
Abstract A polysilazane containing iron (PSZI) was synthesized by the polycondensation of silazane lithium salts with FeCl 3 , and the structure of PSZI was characterized by IR, NMR, and elemental analyses. PSZI was used as an antioxidation additive for methylsilicone oil and rubber. The gelling time of silicone oil w…
Absence of charge-charge correlations at intermediate-range distances in disordered network-forming materials
Applying a first-principles scheme to liquid ${\mathrm{GeSe}}_{4},$ we show that the charge-charge structure factor does not present any feature at the location of the first sharp diffraction peak (FSDP), despite a clear FSDP in the concentration-concentration structure factor ${S}_{\mathrm{CC}}(k).$ The origin of thi…
Effect of filler on the mechanical, dynamic mechanical, and aging properties of binary and ternary blends of acrylic rubber, fluorocarbon rubber, and polyacrylate
Abstract We studied the effects of fillers on the mechanical, dynamic mechanical, and aging properties of rubber–plastic binary and ternary blends derived from acrylic rubber, fluorocarbon rubber, and multifunctional acrylates. The addition of fillers, such as carbon black and silica, changed the nature of the stress–…
Influence of the incident angle of energetic carbon ions on the properties of tetrahedral amorphous carbon (ta-C) films
Tetrahedral amorphous carbon (ta-C) films have been grown on Ar+-beam-cleaned silicon substrates by changing the incident angle of energetic carbon ions produced in the plasma of pulsed cathodic vacuum arc discharge. Their surface roughness, deposition rate, composition, and mechanical and frictional properties as a f…
Synthesis and thermal properties of polyurethane–polysiloxane crosslinked polymer networks
Abstract Polysiloxane–polyurethane crosslinked polymer networks (PSI–PU) were synthesized in solution by polymerization of oligosiloxanes containing γ‐hydroxy propyl groups with polymethane polyphenyl polyisocyanate. Polyether‐based polyurethane and polyester‐based polyurethane were also prepared by a “one‐shot” metho…
NMR studies of water‐borne polyurethanes
Abstract A series of water‐borne polyurethanes were prepared by prepolymerization process. Isophorone diisocyanate, polyester diol, and dimethylol propionic acid were used to conduct the reaction. 1 H‐ and 13 C‐NMR spectra of the raw materials and products thereof were measured with a high‐resolution spectrometer, and…
Binuclear and Starburst Organoplatinum(II) Complexes of 2,2‘-Dipyridylamino Derivative Ligands: Structures, Fluxionality, and Luminescence
New binuclear and starburst trinuclear organoplatinum complexes based on 2,2‘-dipyridylamino (dpa) derivative ligands, Pt 2 Ph 4 (bab), bab = 1,4-bis(2,2‘-dipyridylamino)benzene, 1, Pt 2 Ph 4 (babp), babp = 4,4‘-bis(2,2‘-dipyridylamino)biphenyl, 2, Pt 3 Ph 6 (tab), tab = 1,3,5-tris(2,2‘-dipyridylamino)benzene, 3, Pt 3…
Novel NLO-phores with Proaromatic Donor and Acceptor Groups
[reaction: see text] Novel D-pi-A NLO-phores based on the 1,3-dithiol-2-ylidene donor and the thiobarbituric acceptor moieties have been prepared. Modification of the length and rigidity of the pi-spacer allows the first systematic study of the second-order nonlinear optical properties of doubly proaromatic merocyanin…