Materials Literature
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Through its several orders of magnitude signal enhancement over normal Raman, surface-enhanced Raman spectroscopy (SERS) provides an opportunity to extend the benefits of vibrational spectroscopy to trace level detection. SERS in particular holds great potential for biological sensing due to the weak Raman bands of wa…
We investigate the influence of chain architecture on the microscopic deformation and fracture mechanisms of poly(vinylcyclohexane)−poly(ethylene) (PCHE−PE) block copolymer thin films. To investigate the correlation between the mechanical and fracture properties of the polymer and its chain architecture, a “metal grid…
The interactions between polyamidoamine starburst dendrimers (SBDs) and vesicles consisting of dimyristoylphosphatidylcholine (DMPC) and its phosphatidylcholate salt (DMPA-Na) in various relative ratios (from 0% to 40% of DMPA-Na) were studied by electron paramagnetic resonance (EPR) and by transmission electron micro…
We determine the equilibria of a rigid loop in the plane, subject to the constraints of fixed length and fixed enclosed area. Rigidity is characterized by an energy functional quadratic in the curvature of the loop. We find that the area constraint gives rise to equilibria with remarkable geometrical properties; not o…
Gels and semicrystalline clathrate samples formed by syndiotactic polystyrene (sPS) with 1,2-dichloroethane (DCE) and 1-chloropropane (CP) have been investigated, for the entire composition range from pure solvent to pure polymer, by wide-angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy (FTIR…
During a cold plasma treatment, a polymer surface is involved in many reactions, such as degradation and functionalization. CO 2 plasma treatment leads to carboxylic acid function fixation onto high-density polyethylene surface. Attempts are done to optimize the concentration of these last functions by using CO 2 /H 2…
The electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ is studied by angle-resolved photoelectron spectroscopy (ARPES). The experimental spectra reveal significant discrepancies to band theory. We demonstrate that the measured dispersions can be consistently mapped onto the one-dimensional Hu…
Magnetotransport behavior is investigated in detail across a first-order magnetic phase transition from a ferromagnetic state to an antiferromagnetic state in a polycrystalline $\mathrm{Ce}({\mathrm{Fe}}_{0.96}{\mathrm{Al}}_{0.04}{)}_{2}$ sample. The study clearly brings out various generic features associated with a…
We calculate the imaginary part of the frequency-dependent dielectric function of bulk silicon by applying time-dependent density-functional theory based on the exact-exchange (EXX) Kohn-Sham (KS) band structure and the adiabatic local-density approximation (ALDA) kernel. The position of the E2 absorption peak calcula…
We present a continuum phase-field model of crack propagation. It includes a phase-field that is proportional to the mass density and a displacement field that is governed by linear elastic theory. Generic macroscopic crack growth laws emerge naturally from this model. In contrast to classical continuum fracture mecha…
Hall, resistivity, magnetization, and thermoelectric power measurements were performed on single crystals of the highly anisotropic layered metal LaSb2. A 100-fold linear magnetoresistance (MR) was observed in fields up to 45 T, with no indication of saturation. We show that the MR is associated with a magnetic-field-…
Following a previous work (Tissot, I.; Lefebvre, F.; Bourgeat-Lami, E. Macromolecules 2001, submitted for publication), polystyrene latex particles containing silanol groups have been synthesized in emulsion polymerization using 3-(trimethoxysilyl)propyl methacrylate (MPS) as a functional comonomer. The surface proper…
Abstract The properties of polyurethane (PU) nanocomposites with three different organoclays were compared in terms of their thermal stabilities, mechanical properties, morphologies, and gas permeabilities. Hexadecylamine–montmorillonite, dodecyltrimethyl ammonium–montmorillonite, and Cloisite 25A were used as organoc…
A novel nanocomposite containing polyethylene and polyhedral oligomeric silsesquioxane (POSS) nanoparticles has been characterized using wide-angle X-ray scattering (WAXS). In copolymers formed between ethylene and POSS containing macromonomers, the POSS units, attached as pendant groups off the polyethylene backbones…
We employ density functional and quantum Monte Carlo calculations to show that significant changes occur in the gap of fully hydrogenated nanoclusters when the surface contains passivants other than hydrogen, in particular atomic oxygen. In the case of oxygen, the gap reduction computed as a function of the nanocluste…
Polyelectrolyte multilayers of poly(acrylic acid) (PAA) and polyacrylamide (PAAm) were prepared via hydrogen-bonding interactions. These multilayers as assembled were stable at low pH but dissolved quickly in neutral pH water. We developed methods for stabilizing these multilayers to high pH through cross-linking by h…
Abstract We successfully synthesized an anionic water‐borne polyurethane (PU) capable of reacting with a reactive dye to form a covalent bond with the dye molecule. The anionic water‐borne PU was synthesized and grafted with the reactive dye to form a dyed PU. First, the PU prepolymer was synthesized from 4,4′‐methyle…
Abstract Generalized two‐dimensional (2D) Fourier transform infrared correlation spectroscopy was used to investigate the effect of the comonomer compositions on the crystallization behavior of two types of biosynthesized random copolymers, poly(hydroxybutyrate‐ co ‐hydroxyhexanoate) and poly(hydroxybutyrate‐ co ‐hydr…
Novel benzofuranonaphthoquinol-type clathrate hosts, which exhibit fluorescence enhancement behaviour with a blue shift of the emission maximum upon formation of clathrates with amines, have been developed. The clathrate compounds are formed not only by cocrystallization from amine solutions but also by solid (host)–g…
In order to investigate the paramagnetic ground state of the colossal magnetoresistance (CMR) ${\mathrm{Sm}}_{0.55}{\mathrm{Sr}}_{0.45}{\mathrm{MnO}}_{3}$ compound we have used a wide set of techniques: magnetoresistance, magnetization, high-resolution neutron diffraction, small-angle neutron diffraction, and muon spi…