Materials Literature
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The structural, electronic, vibrational, optical, magnetic, and aromatic characteristics of Si(n), Si(n) (1-), Si(n) (2-), and Si(n) (1+), clusters have been calculated very accurately with a variety of high level ab initio techniques. These calculations have been performed with the aim to clarify existing ambiguities…
Threading nanobeads: Gold nanoparticles (NPs) coated with functional organic ligands are candidate building blocks for the bottom-up fabrication of nanostructured materials. This Highlight describes a recent approach to achieving bidirectional NP–NP connectivity, which is an essential step in the assembly of NP-based…
Three perylene-3,4;9,10-tetracarboxydiimide (PTCDI) compounds with two dodecyloxy or thiododecyl chains attached at the bay positions of the perylene ring, PTCDIs 1-3, were fabricated into nanoassemblies by a solution injection method. The morphologies of these self-assembled nanostructures were determined by transmis…
The quantum ferroelectric phase transition of $^{18}\mathrm{O}$-exchanged ${\mathrm{SrTiO}}_{3}$ ($x%$ exchanged ${\mathrm{SrTiO}}_{3}$ is abbreviated as $\mathrm{STO}18\mathrm{\text{\ensuremath{-}}}x$) was investigated by Raman scattering as a function of $x$. The result indicates the ideal soft mode-type quantum fer…
A zone heating method, which imposes the moving temperature-gradient (▿ T ) field on ordering process of various melts in general, enabled to control a macroscopic orientation of microdomain structures in block copolymer bulk. We applied the method to a polystyrene- block -polyisoprene diblock copolymer forming hexago…
A ruthenium nitrosyl with 4-vinylpyridine (4-vpy) as one ligand, namely, [Ru(Me2bpb)(NO)(4-vpy)](BF4) (1), has been synthesized and structurally characterized. This diamagnetic {Ru-NO}6 nitrosyl is photoactive and readily releases NO upon exposure to low-intensity (5-10 mW) UV light (quantum yield at 300 nm = 0.18). R…
By using high-resolution X-ray powder diffraction at a dedicated synchrotron beam line, ID-31, of the European Synchrotron Radiation Facility (ESRF, Grenoble, France), we studied structural and microstructural modifications in biogenic aragonite crystals, obtained from mollusk shells, and subjected to heat treatments…
Measurements of the magnetic susceptibility $\ensuremath{\chi}$ and electrical resistivity $\ensuremath{\rho}$ are reported in the temperature range $300\text{--}900\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ for ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$, with $x=0$, 0.13, 0.20, 0.25, 0…
The nature of the individual transitions on the potential energy landscape (PEL) associated with particle motion are directly examined for model fragile glass-forming polymer melts, and the results are compared to those of an antiplasticized polymer system. In previous work, we established that the addition of antipla…
Large-scale synthesis of ZnS nanoawls was achieved by a simple two-step pressure-controlled vapor-phase deposition method. Awl-holders were well-rectangular faceted, and the diameter of the awl tips were in the range of 100−200 nm. High-resolution transmission electron microscopy shows that the nanoawls were single cr…
This study reports the successful growth of large-scale vertically aligned ZnO nanowires on sapphire, glass, and Si substrates by direct thermal evaporation without the employment of either metal catalysts or seed layers via a surface-roughness-assisted vapor−solid mechanism. Simple processing steps including mechanic…
We study thin self-assembled columns constrained to lie on a curved, rigid substrate. The curvature presents no local obstruction to equally spaced columns in contrast with curved crystals for which the crystalline bonds are frustrated. Instead, the vanishing compressional strain of the columns implies that their norm…
We use a recently developed molecular dynamics method with an accurate, first-principles-based force field to study shock propagation in $\mathrm{Ni}∕\mathrm{Al}$ nanolaminates and the induced (highly exothermic) chemical reactions. We characterize both perfect nanolaminates and specimens containing small ($4\phantom{…
We introduce an improved method of parametrizing the Groot-Warren version of dissipative particle dynamics (DPD) by exploiting a correspondence between DPD and Scatchard-Hildebrand regular solution theory. The new parametrization scheme widens the realm of applicability of DPD by first removing the restriction of equa…
Highly luminescent semiconductor quantum dots have been synthesized in porous materials with ultraviolet and x-ray lithography. For this, the pore-filling solvent of silica hydrogels is exchanged with an aqueous solution of a group II metal ion together with a chalcogenide precursor such as 2-mercaptoethanol, thioacet…
Vertical aligned ZnO nanorod (diameter = 50 nm) arrays on indium tin oxide (ITO) substrates have been grown using a new two-step soft chemical procedure. The resulting current–voltage ( I – V ) characteristics of the ZnO nanorods exhibited a clear rectifying behaviour. This rectifying behaviour was attributed to the f…
Recombinant human-like collagen (RHLC) was added to fibroin solution to prepare a novel hybrid scaffold material for skin tissue engineering. The morphology of the scaffold had highly homogeneous and interconnected pores with pore sizes 136 +/- 32 mum measured by scanning electron microscopy (SEM). FTIR analysis indic…
We demonstrate morphology dependence of mesoporous silica synthesized in acidic condition via the control of silica hydrolysis and condensation at 4 °C under quiescent acidic condition, and without using any organic cosolvents. Tetramethyl orthosilicates (TMOS) is used as a silica source and cetyltrimethylammonium chl…
Quaternized chitosan/layered silicate nanocomposite was prepared by simple solution-mixing in aqueous media. Montmorillonite (MMT) modified with cetyltrimethyl ammonium bromide was used as an organically modified layered silicate. XRD and TEM analyses respectively confirmed that silicate layers of MMT were intercalate…
FTIR spectroscopy has been used to monitor the transport of CO to the Pt cores of Pt@CoO nanoparticles forming CO/Pt species. It was found that external Pt sites are not present on the outer surfaces of the approximately 10 nm diameter nanostructures and that CO transports to Pt adsorption sites by an activated surfac…