Materials Literature
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A new triphenylamine-containing diamine monomer, 4,4‘-diamino-3‘ ‘,4‘ ‘-dimethyltriphenylamine (DADT), was successfully synthesized by the cesium fluoride-mediated condensation of 3,4-dimethylaniline with 4-fluoronitrobenzene, followed by reduction. The monomer was reacted with various aromatic dicarboxylic acids and…
The interplay between the resonant Raman and the Auger-like regime across the Cu $2\stackrel{\ensuremath{\rightarrow}}{p}3d$ absorption threshold was investigated. The resonant photoemission experiment performed on ${\mathrm{CuGeO}}_{3}$ unambiguously shows that a fraction of primary electrons is contributing to the i…
A new method for evaluation of bremsstrahlung spectra from transmission measurements has been developed. In this method some very well known facts relating to thick target bremsstrahlung spectra are a priori included in the calculation procedure. Some characteristics of the method are preliminarily illustrated on a 6…
Low weight in combination with high strength and good corrosion resistance make titanium alloys excellent candidates for aerospace applications. Their application under conditions where hydrogen is present, e.g., as a fuel component, is limited though, due to their susceptibility to hydrogen embrittlement. In order to…
Spacecraft flying in low Earth orbit (LEO) are exposed to a harsh environment which includes frequent bombardment by fast atomic oxygen (AO) and ultraviolet (UV) radiation. As a result, many spacecraft surface materials are severely eroded. In the case of fluoropolymers, a controversy exists whether AO or UV or AO/UV…
A novel water-soluble peptide-shelled dendrimer containing a poly(L-glutamic acid) segment grafted on the third-generation poly(amido amine) dendrimer was successfully synthesized, and its secondary structural properties and interaction with alpha-amino acids (Trp, Phe, and Tyr) were revealed by spectroscopic measurem…
Progress reports are a new type of article in Advanced Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opinionated, and…
We describe the synthesis of three series of phosphorus-containing dendrimers having azobenzene derivatives specifically placed at some generations in the interior and/or on the surface. The largest compound obtained possesses 48 azobenzene groups on the surface. Irradiation at 350 nm induces isomerization of the azob…
Adamantyl urea and adamantyl thiourea modified poly(propylene imine) dendrimers act as hosts for N-terminal tert-butoxycarbonyl (Boc)-protected peptides and form chloroform-soluble complexes. Investigations with NMR spectroscopy show that the peptide is bound to the dendrimer by ionic interactions between the dendrime…
Surface enhanced Raman scattering (SERS) and surface enhanced resonance Raman scattering (SERRS) from a silver colloid suspension are compared using a dye designed to bond strongly to a silver surface. Titration of the dye into a silver colloid suspension caused aggregation in a controlled manner without an aggregatin…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTVolume Phase Transition of Liquid Crystalline Gels in a Nematic SolventKenji Urayama, Yuko Okuno, Takanobu Kawamura, and Shinzo KohjiyaView Author Information Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011…
Progress reports are a new type of article in Advanced Engineering Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opin…
The bulk glass transition temperature, T g b, of miscible binary blends can be well expressed by the Gordon−Taylor equation. Extending this notion to surface, the surface composition in the blend would be obtained by measuring the surface glass transition temperature, T g s, of each constituent as well as their blend.…
We have studied the magnetic relaxation properties of the phase-separated manganite compound ${\mathrm{La}}_{0.250}{\mathrm{Pr}}_{0.375}{\mathrm{Ca}}_{0.375}{\mathrm{MnO}}_{3}.$ A series of polycrystalline samples was prepared with different sintering temperatures, resulting in a continuous variation of phase fraction…
Adhesion between polymeric phases like adhesives and plastic surfaces is critical in many technological and industrial applications. In the last decades much progress has been made to understand the impact of the surface properties of both phases on the adhesive strength between them. These surface properties influenc…
A theoretical description of electron spin resonance (ESR) in 1D interacting metals is given, with primary emphasis on carbon nanotubes. The spin-orbit coupling is derived, and the resulting ESR spectrum is analyzed using a low-energy field theory. Drastic differences in the ESR spectra of single-wall and multiwall na…
The synthesis of ten benzyl ether based self-assembling monodendrons containing benzo[15]crown-5 at their focal point is presented. These dendritic building blocks self-assemble either directly or via complexation with NaOTf in two-dimensional smectic B, smectic A, and p6mm hexagonal columnar (Phi(h)) and three-dimens…
The nucleus of a new phase is considered as an inclusion embedded into a small grain of a polycrystalline matrix. The calculation of the nucleation barrier of dilatational phase transformation in nanosized crystals is carried out based on the concepts of surface stress associated with phase equilibria suggested by Cah…
The design, synthesis, and characterization of novel water-soluble iodinated dendritic nanoparticles, G-4-(DMAA-IPA) 37, is reported. They consist of a generation 4 Starburst PAMAM dendrimer core and 3- N- [( N ‘,N ‘-dimethylaminoacetyl)amino]-α-ethyl-2,4,6-triiodobenzenepropanoic acid (DMAA-IPA) molecules covalently…
The first hyperpolarizability of aqueous suspensions of polyphosphate stabilized CdS nanocrystals of different mean sizes and of Cd x Zn 1 - x S nanocrystals ( x = 0, 0.25, 0.75, 1) was determined by the hyper-Rayleigh scattering technique. We report the first experimental observation that the first hyperpolarizabilit…