Materials Literature
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We discovered that poly(vinylphenol) (PVPh) possesses an extremely low surface energy (15.7 mJ/m2) after a simple thermal treatment procedure, even lower than that of poly(tetrafluoroethylene) (22.0 mJ/m2) calculated on the basis of the two-liquid geometric method. Infrared analyses indicate that the intermolecular hy…
1-n-Butyl-3-methylimidazolium (bmim) salts of [alpha-SiM12O40]4- and [alpha-S2M18O62]4- (M = Mo, W) were synthesized and characterized. In sharp contrast to the multiple one-electron diffusion-controlled reduction processes expected in solution at a glassy carbon electrode, reduction of these salts beyond the one-elec…
Due to the difficulties, such as lack of generalized synthetic methodologies, production of amorphous materials, diffraction pattern problems, and instability in air, etc., associated with II 3 −V 2 semiconducting compounds (II and V indicate elements of Group II and Group V.), single-crystalline II 3 −V 2 nanostructu…
The success of future nanotechnologies will strongly depend on our ability to control the structure of materials on the atomic scale. For carbon nanotubes it turns out that one of their structural parameters—the chirality—may not be controlled during synthesis. We explain the basic reason for this defect and show that…
Cylindrical polyelectrolyte brushes from poly(styrenesulfonate) were synthesized by polymer analogous hydrolysis from the corresponding dodecyl and ethyl ester brushes. These brushes were characterized in solution (GPC−MALLS, static and dynamic light scattering, SANS, and 1 H NMR), and on solid interfaces (AFM and TEM…
The double-gyroid phase of nanoporous silica films has been shown to possess facile mass-transport properties and may be used as a mold to fabricate a variety of highly ordered inverse double-gyroid metal and semiconductor films. This phase exists only over a very small region of the binary phase diagram for most surf…
Purpose This study aims to evaluate the influence of pulsed cathodic protection on calcareous deposit formation on structures submerged in the synthetic sea water. Design/methodology/approach Chronoamperometric and C HF methods have been used to evaluate the influence of pulsed cathodic protection on decreasing the re…
The large-scale synthesis of the hexagonal Ni 11 (HPO 3 ) 8 (OH) 6 nanocrystallites with delicate morphologies, such as nanoparticles, ellipsoidal rods, dumbbell-like and urchinlike superstructures based on nanorods as well as hollow spheres made of nanoparticles, have been prepared via a very simple hydrothermal meth…
The electrochemomechanical deformation (ECMD) of conducting polymers can be used to create soft actuators or transducers for the conversion of electric power to mechanical work. Polypyrrole (PPy) films, which were electrodeposited from a methyl benzoate solution of tetrabutylammonium (TBA) trifluoromethansulfonate, TB…
Molecular dynamics simulations were used to study the effect of periodic roughness of PE and PVC polymer surfaces on the hydrophobicity. Pillars of different lateral dimensions and heights were derived from flat crystalline surfaces, and the results of nanoscale simulations on the structured surfaces were compared wit…
Abstract Miscellaneous tetrasubstituted ammonium salts of [Pt 3 n (CO) 6 n ] 2– ( n = 5–8) clusters, obtained by the stoichiometric oxidation of the corresponding [Pt 9 (CO) 18 ] 2– salts with tropylium tetrafluoroborate, self‐assemble into infinite semicontinuous or continuous {[Pt 3 n (CO) 3 n (μ‐CO) 3 n ] 2– } ∞ co…
Abstract A new family of biodegradable copolymers of unsaturated poly(ester amide)s (UPEAs) and saturated poly(ester amide)s (SPEAs) based on L ‐phenylalanine, aliphatic dicarboxylic acids, and aliphatic dialcohols was synthesized by solution polycondensation and characterized. These unsaturated/saturated poly(ester a…
We show in this paper how the 3MLCT luminescence of [Ru(bipy)(CN)4]2-, which is known to be highly solvent-dependent, may be varied over a much wider range than can be achieved by solvent effects, by interaction of the externally directed cyanide ligands with additional metal cations both in the solid state and in sol…
The photoluminescence of CdSe/ZnS quantum dots (QDs) in different configurations at solid surfaces (glass, silicon, PDMS, and metals) is considered for three types of organization: QDs directly adsorbed on solid surfaces, separated from the solid surface by a nanoscale polymer film with different thickness, and encaps…
A decrease in the molecular mass of chitosan as a result of polymer degradation during storage of its acetic acid solutions has been simulated by means of mixing of chitosan fractions with different molecular masses. It has been shown that a decline in the polymer molecular mass is responsible for a reduction in the d…
The second edition of this practical text offers a broad introduction to the engineering principles of chemical energy conversion. Eugene L. Keating, Ph.D., P.E., a recognized authority within academia, government, and industry, examines combustion science and technology using fundamental principles. Thermochemical en…
Newkome-type, 1-->3 C-branched dendrons make an excellent headgroup for amphiphiles with ultralong, saturated, linear alkyl chains. Synthesis of a homologous series of five such amphiphiles from 14 to 22 carbons-RNHCONHC(CH2CH2CO2H)3, R = n-CnH2n+1, n = 14, 16, 18, 20, 22-proceeds readily. These amphiphiles are solubl…
The effects of the local environment on surface-enhanced Raman scattering (SERS) spectra utilizing gold, silver, and gold/silver striped nanorod array substrates was investigated. The arrays were fabricated using an electrochemical metal deposition into an anodic aluminum oxide template. The analyte chosen for this st…
Coarsening of barium titanate (BaTiO 3 ) particles under hydrothermal conditions was investigated theoretically and experimentally. A detailed model, in which coarsening is assumed to be controlled by a reversible interface reaction, is presented and discussed. The model predicts a linear growth law R − R 0 = Kt in th…
Self-assembled helices were used as templates to form helical mesopores in a polymeric matrix. The template was formed from the self-association of 3,5-bis(5-hexylcarbamoylpentyloxy)benzoic acid decyl ester in ethylene glycol diacrylate. The monomer was photopolymerized, and the resulting resin was extracted to remove…