Materials Literature
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The principal value of polyethylene lies in its desirable balance of physical properties in the solid state and its chemical inertness. These qualities in combination with its low cost and ready processability make it the material of choice for a wide variety of uses. The balance of physical properties can be controll…
Self-diffusion and tracer diffusion (diffusion in a fixed diblock copolymer matrix) of ABA triblock copolymers of styrene and 2-vinylpyridine (PVP-PS-PVP) have been measured in a spherically ordered domain structure and compared to that of diblock copolymers. In most of the cases, the self-diffusion and tracer diffusi…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTCompetition between Liquid Crystalline Phase Symmetry and Microphase Morphology in a Chiral Smectic Liquid Crystalline−Isotropic Block CopolymerArmin Schneider, Jean-Jacques Zanna, Masayuki Yamada, Heino Finkelmann, and Ralf ThomannView…
Precipitation of CdS in Starburst PAMAM dendrimer solutions offers a viable method of preparing CdS nanoclusters with long-term optical stability. Photoluminescence and UV−visible spectroscopy data show that the dendrimer stabilizes the precipitated CdS as nanoclusters with characteristic optoelectronic properties not…
The goal of the current study is to measure the strength of specific adhesion between a prototypical phospholipid-stabilized ultrasound contrast agent, the surface of which has been derivatized with a ligand molecule, and a glass bead surface coated with the corresponding receptor. In particular, the role of surface “…
This paper focuses on the growth mechanism of the multiwalled carbon nanotubes exhibiting helical and zigzag growth morphologies. Our data support a kinetically controlled growth model in which the creation rates of the pentagon and heptagon carbon rings determine the geometrical shapes of the nanotubes. The carbon na…
The effect of difluorocarbene (CF 2 ) modification on the self-assembly of polystyrene- b -polyisoprene (PS- b -PI) copolymers was investigated. We prepared a set of fully CF 2 -modified PS- b -PI copolymers (PS- b -FPI) with different molecular weights (8−13 kg/mol) and located their order−disorder transition tempera…
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…