Materials Literature
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A new type of surfactant peptide designed to mimic the properties of cationic lipid systems is described. These cationic surfactant peptides are approximately 2 nm in length with a cationic, hydrophilic head consisting of one to two residues of lysine or histidine followed by a hydrophobic tail of six alanine, valine,…
The influence of ionic strength (I) and pH on the permeability of polyelectrolyte multilayers (PEMs) was studied. Fluorescein crystals were coated with a sodium poly(styrenesulfonate) (PSS)/poly(allylamine hydrochloride) (PAH) multilayer shell at pH 2.0 and subsequently dissolved at pH 7.0 or 8.0. From the release pro…
Abstract We report on solution‐processed hybrid solar cells consisting of a nanocrystalline inorganic semiconductor, CuInS 2 , and organic materials. Synthesis of quantized CuInS 2 nanoparticles was performed using a colloidal route, where the particle surface was shielded by an organic surfactant. First attempts were…
Time-resolved carrier dynamics in single-wall carbon nanotubes is investigated by means of two-color pump-probe experiments. The recombination dynamics is monitored by probing the transient photobleaching observed on the interband transitions of the semiconducting tubes. This dynamics takes place on a 1 ps time scale…
Nanostructures of wurtzite‐structured zinc sulfide , which is unlikely to be stable at room temperature under conventional conditions, have been synthesized by a simple physical process. Morphologies with belt‐ (see Figure), saw‐, comb‐, and windmill‐like nanostructures have been observed and characterized using a var…
Abstract A nonwettable polypropylene (PP) surface was modified by an ion‐assisted reaction (IAR) to improve its adhesion with a conjugated polymer, polyaniline (PAN). Hydrogen ions with energies ranging from 0.6 to 1 keV were irradiated on the PP surface in an oxygen gas environment. Ion doses were in the range 5 × 10…
Abstract Infrared spectra of polyamide‐6 (PA6) with and without epoxidized natural rubber (ENR) are presented. The influence of ENR used as a compatibilizer on the morphologies, crystallizability, mechanical properties, and thermal behavior of the polyamide‐6/polyolefins (PO) blends are studied. The infrared spectra s…
Abstract Biodegradable plastics (GSD) based on soy dreg (SD) were prepared by compression‐molding, with glycerol as the plasticizer and glutaraldehyde (GA) as the cross‐linker. The structure and properties of the GSD sheets were investigated by Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), d…
Ultrafast energy exchanges of a non-Fermi electron gas with the lattice are investigated in silver clusters with sizes ranging from 4 to 26 nm using a femtosecond pump-probe technique. The results yield evidence for a cluster-size-dependent slowing down of the short-time energy losses of the electron gas when it is st…
Abstract New cyclic oligomers of the copolymer of poly(ethylene terephthalate) (PET) and poly(ethylene isophthalate) (PEI) were isolated and identified. A condensation polymerization was carried out at a high temperature, and the solid‐state polymerization that followed yielded the high molecular weight polymer. The o…
Triply bridged bis-iminodioxolene dinuclear metal complexes of general formula M(2)(diox-diox)(3), with M = Co, Fe, have been synthesized using the bis-bidentate ligand N,N'-bis(3,5-di-tert-butyl-2-hydroxyphenyl)-1,3-phenylenediamine. These complexes were characterized by means of X-ray, HF-EPR, and magnetic measureme…
Abstract A series of methacrylate‐based chelating polymers was synthesized by the reaction of 3‐hydroxy‐4‐acetylphenyl methacrylate with amines (e.g., ethylenediamine, propylenediamine, and phenylenediamine) in tetrahydrofuran. The chelating polymers were characterized by infrared (IR) and carbon‐13 nuclear magnetic r…
Abstract Gelatin/montmorillonite (MMT) hybrid nanocomposites with improved thermal and mechanical properties were prepared in a previous work. The swelling behavior (swelling rate, swelling kinetics, maximum solvent uptake, etc.) of the obtained composites was investigated. The results showed that the swelling process…
Abstract Composites based entirely on renewable materials with flax fibers as reinforcement and cellulose acetate butyrate (CAB) as the matrix were prepared by compression molding. Scanning electron microscopy of the fracture surfaces showed insufficient penetration of the matrix into the fiber mat. Rheological measur…
Abstract The mechanical, thermal, rheological, and morphological properties of polypropylene (PP)/polystyrene (PS) blends compatibilized with styrene–isoprene–styrene (SIS), styrene–butadiene–styrene (SBS), and styrene–butadiene–rubber (SBR) were studied. The incompatible PP and PS phases were effectively dispersed by…
Abstract The structural characterization of polyesters of citric acid (CA) with ethylene glycol and long‐chain aliphatic alcohols (ROH), prepared by the composition of the reaction mixture being adjusted slightly away from stoichiometric equivalence, was performed with 1 H‐ and 13 C‐NMR spectroscopy. The aliphatic alc…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of a Stable Helical Peptide and Grafting on Gold NanoparticlesPaolo Pengo, Quirinus B. Broxterman, Bernard Kaptein, Lucia Pasquato, and Paolo ScriminView Author Information CNR-ITM Sezione di Padova and Università di Padova, Dipartimento di Chimica Organica, via Marzo…
The low-temperature specific heat $C(T,H)$ of the superconductor ${\mathrm{MgCNi}}_{3}$ has been measured in detail. $\ensuremath{\Delta}C/{\ensuremath{\gamma}}_{n}{T}_{c}=1.97$ is estimated from the anomaly at ${T}_{c}.$ At low temperatures, the electronic contribution in the superconducting state follows ${C}_{\math…
Overview of the automotive plastics market, Susan J. Babinec and Martin C. Cornell plastics processing, Steven D. Stretch formulating plastics for paint adhesion, Dominic A. Berta polymers for coatings for plastics, J. David Nordstrom performance and durability testing, Philip V. Yaneff painting problems, Clifford K.…
Abstract The effects of an organic phosphorus nucleating agent on the crystallization behavior and mechanical properties of poly(propylene) were investigated. As the concentration of nucleating agent increased from 0 to 0.8%, the tensile and flexural strengths of the nucleated poly(propylene) resin increased by 15%, t…