Materials Literature
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Two compounds containing a porphyrin dimer and a perylene tetracarboxylic diimide (PDI) linked by phenyl (1) or ethylene groups (2) are prepared. The photophysical properties of these two compounds are investigated by steady state electronic absorption and fluorescence spectra and lifetime measurements. The ground sta…
Fluorescent polyisoprene nanoparticles were synthesized by the miniemulsion technique as marker particles for cells. The uptake of the non-functionalized polyisoprene nanoparticles, without any transfection agents, into different adherent (HeLa) and also suspension (Jurkat) cell lines is strikingly efficient and fast…
Abstract Nonisothermal crystallization of high density polyethylene (HDPE)/maleic anhydride‐modified HDPE(manPE)/nanoscale calcium carbonate (CaCO 3 ) nanocomposite was investigated by means of wide angle X‐ray diffraction (WAXD), polarized optical microscopy (POM), and differential scanning calorimetry (DSC). WAXD in…
In this paper we consider the following question: How much can we simplify molecular description without sacrificing too much quality of 3D-QSAR models. We compare the performance of the newly developed Simple Atom Mapping Following Alignment (SAMFA) descriptors with CoMFA using nine different data sets from the liter…
The effect of varying wall-particle and particle-particle interactions on the density profiles near a single wall and the solvation forces between two walls immersed in a fluid of particles is investigated by grand canonical Monte Carlo simulations. Attractive and repulsive particle-particle and particle-wall interact…
Abstract In this paper we present our results on growth, characterization, and nano‐devices based on ZnO nano‐structures. The ZnO nano‐structures were grown by mainly two methods, the catalytic Vapor Liquid Solid (VLS) and the low temperature chemical growth. We show that by multiple coating combined with low temperat…
PDMS surfaces have been modified to confer both resistance to non-specific protein adsorption and clot lyzing properties. The properties and chemical compositions of the surfaces have been investigated using water contact angle measurements, ATR FT-IR spectroscopy, and XPS. The ability of the PEG component to suppress…
In the present work a modified phenomenological model of the shape memory alloy (SMA) constitutive law is proposed that is capable of reproducing some aspects of SMA thermomechanical behavior like superelasticity and the one-way shape memory effect. The modified law uses strain and temperature as control variables, wh…
Abstract This study describes the preparation of polycarbonate (PC)/multiwalled carbon nanotube (MWCNT) composites by melt processing the PC and PC/MWCNT master batch at 260°C. The PC/MWCNT master batch was prepared using ultrasonic mixing the carboxylic acid containing MWCNT and PC in a tetrahydrofuran (THF) solution…
This paper evaluates a series of photolabile protecting groups with built-in fluorescence reporting. They rely on readily available o-acetoxyphenyl methyloxazolones as activated precursors. Alcohol substrates are easily caged. The resulting photoactivable esters exhibit large one- and two-photon uncaging cross section…
We have explored oxadiazole and thiophene modifications of the classic calamitic mesogens, p -quinquephenyl, p -sexiphenyl, and p -septiphenyl (P n, n = 5, 6, and 7). Replacing a phenyl ring with 2,5-substituted 1,3,4-oxadiazole and 2,5-substituted thiophene introduces a bend, or kink, into the parent mesogens of 134…
Abstract Rheological behavior of polypropylene (PP)/organoclay nanocomposites varying in compatibilizer (PP‐ g ‐MA) and organoclay concentration was investigated. The samples were prepared by melt intercalation method in an internal mixer. The wide angle X‐ray diffraction patterns and results of rheological measuremen…
Abstract Highly fluorinated liquid crystals with unprecedented polarity were obtained by introducing a tetrahydropyran moiety into their mesogenic core structure. The new materials exhibit an unusually favourable combination of mesophase properties, excellent solubility and low rotational viscosity, which renders them…
Abstract Cocontinuous cellulose acetate (CA)/polyurethane (PU) composite nanofibers were obtained through electrospinning of partially miscible CA and PU in 2:1 N,N ‐dimethylacetamide (DMAc)/acetone mixture solvent. Their structures, mechanical, and thermal properties were characterized by scanning electron microscopy…
Abstract Preparative methods for the incorporation of polyhedral oligomeric silsesquioxane (POSS) macromonomers into ethylene–propylene (EP) polymers have been developed that utilize metallocene polymerization. Analysis of these novel ethylene–propylene–POSS polymers using wide‐angle X‐ray diffraction reveals that pen…
Because of their potential for use in advanced electronic, nanomechanical, and other applications, large two-dimensional, carbon-rich networks have become an important target to the scientific community. Current methods for the synthesis of these materials have many limitations including lack of molecular-level contro…
The antifouling properties of poly(2-hydroxyethyl methacrylate- co-methyl methacrylate) hydrogels were improved by the surface grafting of a brush of poly(oligoethylene glycol methyl ether acrylate) [poly(OEGA)]. The atom-transfer radical polymerization (ATRP) of OEGA (degree of polymerization = 8) was initiated from…
Abstract PTFE samples were treated by low‐pressure O 2 RF plasmas. The adsorption of BSA was used as a probe for the protein‐resistant properties. Exposure of PTFE to an O 2 plasma leads to an increase in chamber pressure. OES reveals the presence of CO, CO 2 and F in the gas phase, indicating a strong etching of the…
The relation between static structure and dynamics as measured through the diffusion coefficients in viscous multicomponent metallic melts is elucidated by the example of the binary alloy Zr64Ni36, by a combination of neutron-scattering experiments and mode-coupling theory of the glass transition. Comparison with a ha…
Abstract The properties of silicone rubber filled with three kinds of binary mixtures of alumina particles with different size distribution (i.e., 30 μm + 0.5 μm, 10 μm + 0.5 μm, and 5 μm + 0.5 μm) were investigated as a function of relative volume fraction of the 0.5 μm particles in the hybrid alumina ( V s ) at a fi…