Materials Literature
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The dielectric spectra for the series poly(dimethyl itaconate) to poly(di- n -octyl itaconate) have been measured and are discussed within the context of a main-chain−side-chain nanomorphology. The major dielectric event is associated with the calorimetric glass transition. In contrast to methacrylate family of polyme…
We have analyzed the structure and composition of the first layer of an ${\text{Al}}_{72}{\text{Co}}_{16}{\text{Ni}}_{12}$ tenfold surface by means of scanning tunneling microscopy (STM), ion scattering spectroscopy (ISS), and Auger electron spectroscopy (AES). High-resolution STM images reveal local structures that h…
Fangen spielen mit Terbium: Neue hydrophobe Kontakte und bindende Aminosäuren wurden bei der Röntgenstrukturanalyse (2.0 Å Auflösung) eines chemisch entwickelten, 17 Aminosäurereste umfassenden Lanthanoid-bindenden Peptids im Komplex mit Tb3+ nachgewiesen (siehe Bild). Diese Befunde sind in Einklang mit denen von Lumi…
The preparation and physical characterization are reported for a novel single-molecule magnet [Mn(12)O(12)(OAc)(12)(dpp)(4)] (dppH = diphenyl phosphate) with no coordinating water molecules. The crystal structure analysis reveals that there are four five-coordinate Mn(III) ions with Mn.H approaches. Addition of water…
Abstract Soy protein concentrate, a potential alternative of petrochemical polymers, has been crosslinked with furfural at 0.5,1, 2.5, 5, and 7.5% (w/w). The materials were then compression‐molded into plastic tensile bars and tested for tensile and yield strength, percentage elongation, and water absorption. The infr…
Abstract The mechanical properties and aging characteristics of blends of ethylene propylene diene monomer (EPDM) rubber and styrene butadiene rubber (SBR) were investigated with special reference to the effect of blend ratio and cross‐linking systems. Among the blends, the one with 80/20 EPDM/SBR has been found to ex…
Concurrent sonolysis of iron pentacarbonyl and poly(ethylene glycol)-400 (PEG-400) in hexadecane solvent proceeds via zero-order kinetics and results in Fe nanoparticles encapsulated in PEG-400 (Fe-PEG). The transmission electron microscopy images show Fe-PEG consisting of <3 nm Fe particles that are evenly dispersed…
Hydrosilylative crosslinking of the coronas of tubules of self-assembled poly(ferrocenyldimethylsilane-b-polymethylvinylsiloxane) (PFS–b–PVMS) formed in hexane result in shell-crosslinked organometallic nanotubes (see picture) with reversible redox behavior and tunable swellability.
Exceptional resistance to sulfur poisoning of the Na–Y zeolite arises from the localization of adsorbed sulfur dioxide on the zeolite in the presence of water. The work shows that Rietveld refinement of guest molecules is a powerful method to determine positions and states of different molecules co-adsorbed on a zeoli…
Abstract The stacked lamellar morphology commonly found in extruded semicrystalline materials has a strong influence on the flow direction, with respect to the loading direction, and on the stability and localization phenomena in tensile experiments. A multiscale numerical model was used to simulate the effect on the…
Dimers of flat (EDO-TTF)+ molecules separated by bent neutral EDO-TTF (ethylenedioxytetrathiafulvalene) molecules are found in the insulator phase of (EDO-TTF)2PF6, but not in that of the metallic phase. The cooperativity of Peierls distortion, charge ordering, and anion ordering in this metal–insulator transition can…
Abstract The formation of Ag clusters on silica colloidal nanoparticles was achieved by photoreduction of silver ions with visible laser irradiation. A mechanism of this process was proposed by observing the plasmon resonance bands of the silver clusters in UV–visible absorption spectroscopy. These Ag/SiO 2 colloids a…
Getting the guests to leave without destroying them and potentially damaging the templated inorganic host (see structure) is crucial to the preparation of completely porous materials. Alternatives to calcining, such as extraction and chemical cleavage of the template, are being developed.
Abstract Crosslinked sodium polyacrylate was prepared by solution polymerization with N , N ‐methylene‐bisacrylamide (bisAM) as crosslinking agent; it was subsequently surface‐crosslinked by ethylene glycol diglycidyl ether (EGDE) and then was modified with inorganic salt to obtain a superabsorbent with water absorben…
Charged with hopping: A conducting polymer containing electroactive segments interconnected by crown ether calix[4]arene units (see picture) exhibits dramatic changes in its conductivity in response to the binding of ions. There is over three orders of magnitude difference in conductivity between the incorporation of…
Abstract Starch acetate–corn fiber foams were prepared by extrusion. Corn starch was acetylated (DS 2) to introduce thermoplastic properties. Corn stalks were treated with sodium hydroxide to remove the lignin and to obtain purified cellulose fibers. Starch acetate was blended with treated fiber at concentrations of 0…
Spiropyran is a photoresponsive molecule, and nonionic spiropyran is reversibly changed by UV irradiation to a hydrophilic polar, zwitterionic merocyanine isomer, and back again by visible light irradiation. A copolymer of nitrobenzospiropyran and methyl methacrylate, poly(NSP-co-MMA) was used as a material with a pho…
A central role for the alkali metal cation was determined in the thermally activated electron transfer CoIII(LS)-FeII(LS) ⇌CoII(HS)-FeIII(LS) in a CsCoFe Prussian blue derivative by localizing the alkali metal ion and identifying its interactions with the surrounding network in the high- and low-temperature states (se…
A viologen, N-hexyl-N'-(4-vinylbenzyl)-4,4'-bipyridinium dinitrate (HVVN), was synthesized and subsequently graft-copolymerized on poly(ethylene terephthalate) (PET) films. Silver nanoparticles can be deposited on the surface of the HVVN-PET film through photoinduced reduction of the silver ions in salt solution. The…
Abstract The organic–inorganic hybrid composites comprising acrylic rubber and silica were synthesized through sol–gel technique at ambient temperature. The composites were generated through the acid‐catalyzed hydrolysis and subsequent condensations of inorganic tetraethoxysilane (TEOS) in the organic acrylic rubber (…