Materials Literature
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The structure of adsorbed octa(oxyethlyene) n -dodecyl ether (C 12 E 8 ) layers at a series of gold−alkanethiolate surfaces was investigated by atomic force microscopy. The hydrophobicity of the surfaces was systematically varied by changing the relative amounts of chemisorbed thiohexadecane (CH 3 (CH 2 ) 15 SH) and t…
To study the influence of PEO on the relaxation process of PMMA, the real and imaginary parts of the permittivity, ε‘ and ε‘ ‘, of PEO/PMMA blends (with PEO contents up to 25 wt %) were measured as a function of frequency and temperature, and the results obtained were compared with those of pure PMMA. It is shown that…
The newly screened Aeromonas hydrophila produces copolymer consisting of 3-hydroxybutyrate (3HB) and 3-hydroxyhexanoate (3HHx). The characteristics of cell growth and polymer accumulation were examined using various carbon sources. P(3HB-co-3HHx) was produced from lauric acid and oleic acid only. P(3HB-co-3HHx) conten…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSpontaneous Formation of Gold Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine)dendrimersKunio Esumi, Tomoyuki Hosoya, Akihiro Suzuki, and Kanjiro TorigoeView Author Information Department of Applied Chemistry and Institute of Colloid and Interface Scie…
We present a microscopic model for nanoparticles, of the maghemite ($γ$% -Fe$_{2}$O$_{3}$) type, and perform classical Monte Carlo simulations of their magnetic properties. On account of Mössbauer spectroscopy and high-field magnetisation results, we consider a particle as composed of a core and a surface shell of con…
MnFe 2 O 4 nanoparticles are synthesized by using sodium dodecylbenzenesulfonate (NaDBS) to form water-in-toluene reverse micelles. The nanoparticles are single crystalline, and the average particle size can be controlled from 4 to 15 nm. High- and low-resolution transmission electron microscopy characterization has s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and Atomic Structure, and Magnetism of Transition-Metal ClustersJ. A. AlonsoView Author Information Departamento de Física Teórica, Universidad de Valladolid, 47011 Valladolid, Spain Cite this: Chem. Rev. 2000, 100, 2, 637–678Publication Date (Web):January 20, 200…
This text provides the basic history, molecular structure and intrinsic properties, practical applications and future developments of polyethylene production and marketing - including recycling systems and metallocene technology. It describes commercial processing techniques used to convert raw polyethylene to finishe…
The effect of a compatibilizer on the breakup and coalescence of droplets in flowing polymer blends was analyzed. The analysis was based on theories developed in the literature for low molecular weight emulsions containing a surfactant. Analysis of the stepwise and transient breakup mechanisms led to the conclusion th…
The mechanisms of formation and structure of precipitates hydrolyzed from aqueous solutions of titanium tetrachloride and titanium sulfate were studied by small-angle X-ray scattering (SAXS). SAXS was found a powerful method for that purpose. The small colloidal primary particles that were present in the solutions at…
Hydrophobicity of a “water-tolerant” solid acid, Cs 2.5 H 0.5 PW 12 O 40, has been investigated by adsorptions of water and benzene. One water molecule was adsorbed irreversibly at 298 K per one proton of Cs 2.5 H 0.5 PW 12 O 40 as well as H−ZSM-5 (Si/Al = 40), while H 3 PW 12 O 40 formed a stable hexahydrate. From th…
Isotactic polypropylene (iPP) samples, quenched and then annealed at 70°C, 80°C, 110°C, 140°C, and 150°C, were investigated by X-ray diffraction. The transition from the quenched form (smectic) to the well-crystallized one is analyzed to explain better the morphological-structural changes that occur by annealing. For…
Crystallization and melting of a copolymer depend on both intrachain and interchain distributions of noncrystallizable comonomer. Hydrogenated polybutadiene (HPB) is a model ethylene-butene (EB) random copolymer with known intrachain distribution and no interchain distribution of branching. Differential scanning calor…
Twelve viologens, i.e., 4,4′-bipyridinium derivatives 1 – 12, were examined for their use as electrochromic material when attached to nanocrystalline titanium dioxide thin-film electrodes. Eight of these (1 – 4, 7 – 8, 10, and 12) are new, and their synthesis is included. The modifier compounds consist of one to four…
Ferricyanide oxidation of 1,4,5,6-tetrahydro-2,4-dimethyl-6-(2'-pyridyl)-1,2,4,5-tetrazin-3(2H)-one (pvdH3) produces the stable chelating free radical 1,5-dimethyl-3-(2'-pyridyl)-6-oxoverdazyl (pvd) as an orange solid. Combination of group 12 metal halides with the ligand pvdH3 in acetonitrile results in precipitation…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHydroformylation Reactions Using Recyclable Rhodium-Complexed Dendrimers on SilicaS. Christine Bourque, Howard Alper, , and View Author Information Department of Chemistry, University of Ottawa 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5 DuPont Central Research & D…
The silation of silica with hexamethyldisilazane (HMDS) was examined over the temperature range 150−450 °C. The products and sequence of the reactions at the silica surface were determined. The major products are hexamethyldisiloxane (HMDSO) and ammonia, with lesser amounts of nitrogen and methane. No methane is produ…
The "electrochemical/chemical method" (or "E/C method") is a new wet chemical method for synthesizing semiconductor quantum dots on graphite surfaces. The E/C synthesis of quantum dots composed of the generic semiconducting salt, MX, typically involves three steps: (1) electrochemical deposition of nanoparticles of th…
Thin films of a biopolymer chitosan (CHIT) were cast on glassy carbon electrodes, modified by grafting Lucifer Yellow VS dye (LYVS) onto chitosan chains, and cross-linked with glutaric dialdehyde (GDI). The ion-transport and ion-exchange properties of such polymeric structures (CHIT, CHIT-LYVS, CHIT-LYVS-GDI) were stu…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA S = 7 Ground Spin-State Cluster Built from Three Shells of Different Spin Carriers Ferromagnetically Coupled, Transition-Metal Ions and Nitroxide Free RadicalsKira E. Vostrikova, Dominique Luneau, Wolfgang Wernsdorfer, Paul Rey, and Michel VerdaguerView Author Inform…