Materials Literature
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Excitation of a carotenoid (C) porphyrin (P) fullerene (C 60 ) molecular triad yields the porphyrin first excited singlet state, C− 1 P−C 60, which decays via a sequential two-step photoinduced electron-transfer process into a C •+ −P−C 60 •- charge-separated state with a lifetime of 340 ns in 2-methyltetrahydrofuran…
[reaction: see text] By means of a two-layered ONIOM approach, we predict that sidewall epoxidation of single-walled carbon nanotubes (SWNTs) with dioxiranes is viable. The SWNT epoxides thus produced could be precursors for further chemical modification of SWNTs, given the abundant and well-established chemistry of o…
We study the possibility of nanoscale phase separation in manganites in the framework of the double-exchange model. The homogeneous canted state of this model is proved to be unstable towards the formation of small ferromagnetic droplets inside an antiferromagnetic insulating matrix. For the ferromagnetic polaronic st…
Raman spectra of HiPco SWNT and SWNT-pyrene films were measured in the 160–1800 cm−1 range. Due to the non-covalent interaction between SWNT and pyrene the most intensive component of the SWNT G mode (1590 cm−1) is downshifted by 2 cm−1 and becomes narrower. Also the intensity of the low-frequency component of the G m…
We present a systematic study on the synthesis of mixed monolayer-protected clusters (MMPCs) from mixtures of alkanethiols. Our results show that solvation-driven thermodynamic preferential adsorption of precursor ligands governs monolayer composition of MMPCs. In the mixed system HO(CH 2 ) n SH/ CH 3 (CH 2 ) m SH ( n…
Abstract Hydrogen bonding in polyamide 66/clay nanocomposite (PA66CN) was first investigated with temperature Fourier transform infrared (FTIR), the results of which were compared with that of pristine polyamide 66 (PA66) with the same thermal history. FTIR spectra at room temperature revealed that there is essentiall…
The complexation behavior, binding properties, and spectral parameters of supramolecular chirality induction in the achiral host molecule, syn (face-to-face conformation) ethane-bridged bis(zinc porphyrin), upon interaction with chiral bidentate guests (diamines and amino alcohols) have been studied by means of UV-vis…
Amorphous syndiotactic polystyrene (sPS) was crystallized at room temperature in dichloromethane, chloroform, toluene, o -dichlorobenzene, and decalin (cis−trans) to form the clathrate structure (δ form) with respective solvent molecules. Room temperature FTIR spectra are compared for subtle differences, which arise d…
Abstract Impact‐modified polypropylene (PP)/vermiculite (VMT) nanocomposites toughened with maleated styrene–ethylene butylene–styrene (SEBS‐ g ‐MA) were compounded in a twin‐screw extruder and injection‐molded. VMT was treated with maleic anhydride, which acted both as a compatibilizer for the polymeric matrices and…
We report extensive molecular-dynamics-simulation results for binary mixtures of hard spheres for different size disparities and different mixing percentages, for packing fractions up to 0.605, and over a characteristic time interval spanning up to 5 orders in magnitude. We explore the changes in the evolution of glas…
An alcohol-free sol−gel route based on the controlled vacuum evaporation of the alcohol that results as a byproduct of the hydrolysis and condensation of alkoxyde precursors is described for the encapsulation of living bacteria. The ability of the encapsulated cells (a genetically engineered E. coli strain) to express…
For a binary polymer brush layer, we investigated the morphological state, the structure reordering, and the nanomechanical properties as a function of treatment with selective solvents. Two incompatible polymers, poly(methyl acrylate) (PMA) and poly(styrene- co -2,3,4,5,6-pentafluorostyrene) (PSF), were randomly graf…
A postsynthesis method of separating metallic from semiconducting single-walled carbon nanotubes and a method based on absorption spectroscopy for assay of the separation efficiency are described. The separation method relies on chemical discrimination in the charge-transfer complex formation between bromine and the m…
Orbital ordering occurs in many transition metal compounds with Jahn–Teller ions (Cu 2+ , Mn 3+ , low-spin Ni 3+ , Ti 3+ etc). It plays an important role in these materials. At the same time, exchange interactions in orbitally degenerate systems are inherently frustrated, even in materials with simple crystal lattices…
A pressure-filter-template approach was employed to prepare polyelectrolyte nanotubes through layer-by-layer deposition in the alumina template. With the thicker wall, the ordered polymer nanotubes possess a high flexibility. The results demonstrate that the electrostatic interactions of polyelectrolytes play a key ro…
The controlled self-assembly of complex molecules into well defined hierarchical structures is a promising route for fabricating nanostructures. These nanoscale structures can be realized by naturally occurring proteins such as tobacco mosaic virus, capsid proteins, tubulin, actin, etc. Here, we report a simple altern…
A simple method of electrochemical deposition was adopted to prepare conductive hydrophobic zinc oxide (ZnO) thin films. The surface structures were characterized by sanning electron microscopy (SEM) and atomic force microscopy (AFM). Wettability studies revealed that the surface of the as-prepared thin films showed a…
This paper presents the results of a preliminary assessment conducted to estimate the thermal response and erosion lifetime of the ITER divertor targets clad either with carbon-fibre composite or tungsten during type I ELMs. The one-dimensional thermal/erosion model, used for the analyses, is briefly described. It inc…
Well-aligned ZnO nanorods with identical crystallographic orientation have been synthesized using a vapor transport deposition process. Orientation-ordered nanorods grow normal to the c planes of the as-deposited micrometer-sized ZnO rods on a polycrystalline Al 2 O 3 substrate, and each nanorod is along [0001] and en…
Molecular surface enhanced Raman scattering (SERS) in compact clusters of 30−70 nm Ag nanocrystals has shown single molecule Raman scattering cross sections that are orders of magnitude larger than free space single molecule luminescence cross sections. We analyze certain aspects of this phenomenon with new numerical…