Materials Literature
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Polypropylene-based composites containing 10–30% by weight cellulose microfibrils were studied. Composites with polypropylene and cellulose microfibrils were characterised by MS-coupled simultaneous TGA-DSC and the reinforcing effect of cellulose microfibrils was emphasised by mechanical characterization. Experimental…
Two-dimensional dopant mapping using secondary electrons in a scanning electron microscope is a useful and rapid technique for studying dopant distributions with high spatial resolution in semiconductor materials and devices. However, it has not yet found widespread application because the quantification of dopant con…
The current article presents experimental observations of erythrocytes aligning in nematic liquid crystal (NLC) medium as well as following study of the rearrangement of the NLC matrix induced by aligned bodies. The results of this study showed that a pronounced rearrangement of a pristine NLC mesophase could be induc…
Grafting of electroactive p-phenyldiazonium derivatives was performed on carbon electrodes. Reduction potentials were determined for commercial and new synthesized diazonium salts, in relation to the electronic behaviour of the para substituents of the diazophenyl groups. Their covalent attachment on the electrode sur…
In the frame of this work, we studied organometallic complexes in form of thin films oriented by corona poling. We report measurements of second and third-order nonlinear optical properties (NLO) obtained by SHG and THG techniques. For each compound studied, we determine the electronic contribution of the effective se…
Over the last few years, low energy electron microscopy and photoemission electron microscopy have been successfully used to study the growth dynamics of various organic semiconductors. In the present work, the recent advances in the application of surface sensitive electron microscopy techniques to organic thin films…
La diffraction des rayons X, la spectroscopie Raman et l'analyse par spectroscopie d'emission optique ont ete utilisees pour etudier l'effet des ions magnesium, calcium et sulfate sur la cinetique de precipitation et la microstructure du carbonate de calcium forme, par la methode de degazage controle, a partir des sol…
Polypyrrole films have been successfully synthesized on zinc surface in absence and presence of sodium bis(2-ethylhexyl) sulfosuccinate and sodium dodecylbenzosulphonate as dopants. The synthesis was achieved by galvanostatic method. The electrochemical behaviour of doped-polypyrrole films was investigated by electroc…
Abstract A series of poly(ethylene terephthalate) (PET) depolymerization experiments versus time was proceeded under optimal experimental conditions with microwave radiation, in which the temperature was 220°C, the pressure was 200 psi, the microwave power was 260 W, and the ratio of water to PET was 10 : 1. The relat…
With an increasing number of biological macromolecular crystal structures measured at ultrahigh resolution (1 A or better), it is necessary to extend to large systems the experimental valence electron density modelling that is applied to small molecules. A database of average multipole populations has been built, desc…
The nonlinear optical photonic crystal of dichloridodiglycine zinc dihydrate was grown from a mixture of glycine and zinc chloride by a slow evaporation technique. The morphology and the structure of the grown crystal were characterized using single crystal X-ray diffraction analysis. The crystalline perfection of the…
Abstract Composites containing carbon nanotubes (CNTs) in a poly(butyl methacrylate) (PBMA) have been prepared by in situ polymerization. Scanning electron microscopy and high‐resolution transmission electron microscope showed that CNTs were well dispersed into PBMA matrix and wrapped with PBMA. The infrared spectrum…
The temperature dependence of surface relief grating formation was studied using continuous and pulse like exposure. Surface relief gratings were inscribed on amorphous azobenzene polymer thin films using a holographic pattern of circularly polarized light at wavelength equal to 514 nm in a vacuum chamber to avoid the…
To observe the ionized status of the amino acid residues in proteins at different pH (protein pH titration in the crystalline state) by neutron diffraction, hen egg-white lysozyme was crystallized over a wide pH range (2.5-8.0). Crystallization phase diagrams at pH 2.5, 6.0 and 7.5 were determined. At pH < 4.5 the bor…
Abstract TFAA has been used widely for the derivatization of hydroxyl groups in XPS of organic polymers. Unfortunately, in the presence of other nucleophilic groups at the surface like amino groups, these also react with TFAA and a quantification of the different functional group concentrations is impossible. It has b…
Supported nanoparticulate Rh systems are studied as a model system for the important three way catalysts as used in the combustion engines of cars. Small Rh nanoparticles with a small particle size distribution can be easily synthesized and their morphology is studied using x-ray absorption fine structure (XAFS) spect…
We report that the amphiphilic rod−coil−rod triblock copolymer with a coil attractive to the substrate surface self-organize into liquid crystalline monolayers or bilayers of a few nanometers thickness on the substrate surface. The copolymer investigated is a triblock copolymer, poly( n -hexyl isocyanate- b -2-vinylpy…
Abstract The mechanical properties of natural rubber latex (NRL) modified with styrene‐grafted natural rubber (styrene‐GNR) latex were investigated. Styrene‐GNR was first synthesized via emulsion copolymerization using cumene hydroperoxide/tetraethylene pentamine as an initiator. The styrene‐GNR latex produced was mix…
We show that a superresolution process with 100% visibility is characterized by the formation of a point of phase singularity in free space outside a metamaterial in the form of a saddle with topological charge equal to $\ensuremath{-}1$. The saddle point is connected to two vortices at the end boundaries of the lens,…
Sample-exchange robots that can exchange cryo-pins bearing protein crystals out of experimental hutches according to user instructions have been developed. The robots were designed based on the SAM (Stanford Synchrotron Research Laboratory automated mounting) system. In order to reduce the time required for the sample…