Materials Literature
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The extent of flattening of poly(butyl methacrylate) (PBMA) latex film surfaces was determined using the atomic force microscopy (AFM) technique and compared with the extent of polymer chain migration between adjacent particles in the film, which was determined by the nonradiative energy transfer (NRET) method. The fi…
[structure: see text] An efficient and potential stepwise strategy involving the mixed sequence of Stille and Wittig-Horner reactions was used for the preparation of a polyene-substituted bis-porphyrin incorporating a bipyridine moiety.
A Fourier transform infrared spectroscopy investigation relative to clathrate forms of syndiotactic polystyrene (s-PS) with chlorinated organic compounds is presented. In particular, for 1,2-dichloroethane (DCE), 1,2-dichloropropane (DCP), and 1-chloropropane (CP), the absorption peaks which are modified as a result o…
Fluoropolymers exhibit a number of favorable properties such as high-temperature stability, chemical resistivity, and a low surface energy. However, the possibility to incorporate fluoropolymers into other materials is limited because of the low surface energy. Modification procedures such as radiation modification ca…
Single flat-elongated and helical lamellar crystals have been grown thermotropically in a main-chain nonracemic chiral liquid crystalline polymer that was synthesized from ( R )-(−)-4‘-{ω-[2-( p -hydroxy- o -nitrophenyloxy)-1-propyloxy]-1-nonyloxy}-4-biphenyl carboxylic acid, PET(R*)-9. The crystals possess the identi…
Photophysical properties of 10 substituted methoxybenzene or vinyl linked benzo-crown-ether−2,2‘-bipyridyl ruthenium(II) complexes are reported. The lifetimes of the excited triplet metal to ligand charge transfer states, 3 MLCT, of the complex ions are in the range 0.85 ± 0.12 μs with two exceptions where the lifetim…
The adsorption of calf thymus DNA to 45 Å nanoparticles of Cd(II)-rich CdS has been examined by photoluminescence spectroscopy as a function of temperature. The resulting van't Hoff plot suggests that the driving force for adsorption is entropy, and the enthalpic contribution to DNA−surface binding is slightly unfavor…
Several members of the RNase A superfamily are endowed with antitumor activity, showing selective cytotoxicity toward several tumor cell lines. One of these is onconase, the smallest member of the RNase A superfamily, which is at present undergoing phase III clinical trials. We report here the expression of recombinan…
Trivalent methyl and vinyl samarium derivatives supported by the calix-tetrapyrrole ligand system (Et 8 -calix-pyrrole)(R)Sm(μ 3 -Cl)[Li(THF)] 2 [Li(THF) 2 ] [R = Me ( 2a ), CH CH 2 ( 2b )] were prepared via reaction of (Et 8 -calix-pyrrole)(Cl)Sm[Li 2 (THF) 3 ] ( 1 ) with the corresponding organolithium reagent. Comp…
Five generations of carboxylate-functionalized poly(propyleneimine) dendrimers have been synthesized starting from a double Michael addition of amine-functionalized poly(propyleneimine) dendrimers to methyl acrylate followed by basic hydrolysis using LiOH in a water/methanol mixture. The dendritic compounds have been…
PbSe nanoparticles of about 12 nm in size have been prepared by a pulse sonoelectrochemical technique from an aqueous solution of sodium selenosulfate and lead acetate. The PbSe nanoparticles were characterized, using techniques such as transmission electron microscopy, X-ray diffraction, absorption spectroscopy, diff…
The connection between friction and jamming in granular media, molecular glasses, and complex fluids is explored. The paper first reviews the way friction is measured, the types of results that are observed, and what is known about the geometry of contacts between macroscopic surfaces. Then simple models for the origi…
Laser Raman spectroscopy (LRS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet and visible diffuse reflectance spectroscopy (UV-DRS), and temperature-programmed reduction (TPR) are used to characterize a series of WO 3 /CeO 2 samples. The r…
The differences in the fluorescence behavior of a polyphenylene dendrimer with eight peryleneimides chromophores (1) and a single hexaphenylperyleneimide chromophore have been investigated at a single-molecule level through the combination of ultrasensitive fluorescence detection and microscopy.
Die Copolymerisation von Acrylamid und dem tetrafunktionalisierten Polyanion [γ-SiW10O36(RSiO)4]4− (R=C3H6OC(O)C(Me)=CH2), das als Vernetzungsmittel dient, in einer wäßrigen Dispersion von Maghemit(γ-Fe2O3)-Nanopartikeln führt zu einem magnetischen Hybridhydrogel (siehe Schema) mit superabsorbierenden Eigenschaften. D…
Die prognostizierte Racematspaltung von Cyclooctapyrrolen mit chiraler 8er-Konformation – und von Metallkomplexen, die von diesen Liganden abgeleitet sind – ist realisierbar. Das Hexadecaethylderivat des Cyclooctapyrrols 1, das laut NMR-Analyse eingeschränkt beweglich ist, konnte ebenso wie dessen zweikernige Palladiu…
Tetrahedral framework structures with topologies that show close relationships to the feldspar group or to gismondine are formed by the zincoborophosphates A[ZnBP2O8] (see picture). The compounds are readily accessible under mild hydrothermal conditions (Tmax=170°C) and are thermally remarkably stable (for example, 94…
Virtual inaccessibility to external contact was revealed by electrochemical investigations for a bis(1,10-phenanthroline)copper(I) core embedded in dendrimers with up to 16 peripheral fullerene units (shown schematically). With increasing numbers of fullerene units, less and less light is available to the core, and th…
The structure of lamellar poly(styrene- block -methyl methacrylate), denoted as P(S- b -MMA), diblock copolymer films on neutral poly(styrene- random -methyl methacrylate), denoted as P(S- r -MMA), brush surfaces was examined as a function of annealing time and film thickness using neutron reflectivity and small-angle…
Die exakte atomare Architektur des katalytisch aktiven Zentrums steht im Zentrum des hier vorgestellten Ansatzes zum Design von Feststoffkatalysatoren. Er lieferte eine große Bandbreite neuartiger Katalysatoren unter anderem für regioselektive, formselektive und enantioselektive Reaktionen, für die effiziente Isomeris…