Materials Literature
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Nearly monodispersed CaWO 4 hollow microspheres with controlled diameters were successfully prepared by a facile one-step hydrothermal method using CaCl 2, Na 2 WO 4, and sodium dodecyl sulfate (SDS) as the starting reaction reagents and distilled water as solvent. The crystal structure, morphology, macroporous and ph…
Abstract Poly(dimethylsiloxane) (PDMS) has a long history of exploitation in a variety of biological and medical applications. Particularly in the past decade, PDMS has attracted interest as a material for the fabrication of microfluidic biochip. The control of cell adhesion on a PDMS surface is important in many micr…
Highly ordered mesoporous three-dimensional Ia3d silica (KIT-6) with different pore diameters has been synthesized by using pluronic P123 as surfactant template and n-butanol as cosolvent at different synthesis temperatures in a highly acidic medium. The materials were characterized by XRD and N(2) adsorption. The syn…
A solvent tune: The crystallization solvent affects the temperature and light dependence of the valence tautomeric behaviour of a 1:1 Co–dioxolene compound, thus offering a new possibility of tuning its charge distribution (see figure). This approach paves the way for the development of molecular magnetic materials wh…
Multifunctional catalysts: Nickel–gold alloy nanoparticles (NPs) are synthesized in solution, by means of a fast butyllithium reduction method, and then used to prepare NiO-stabilized Au NP catalysts through a phase-transformation process (see scheme). The silica-supported catalysts exhibit a remarkable resistance to…
With four-dimensional (4D) electron microscopy, we report in situ imaging of the mechanical drumming of a nanoscale material. The single crystal graphite film is found to exhibit global resonance motion that is fully reversible and follows the same evolution after each initiating stress pulse. At early times, the moti…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTDynamics of Biomineral Formation at the Near-Molecular LevelS. Roger Qiu and Christine A. Orme*View Author Information Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, Mailstop L-367, Livermore, California 94550Cite this: Chem.…
Crystallization kinetics of colloidal model suspensions: recent achievements and new perspectives
Nanostructured iron oxides were electrodeposited anodically onto nickel substrate in aqueous solution at room temperature. Deposited films after annealing at are characterized as rhombohedral . The morphology of the porous film deposited at high current density shows nanosheets of in thickness. A film deposited at low…
Syntheses, crystal structures, and magnetochemical characterization are reported for the three new nickel(II) clusters [Ni(14)(OH)(4)(N(3))(8)(pao)(14)(paoH)(2)(H(2)O)(2)](ClO(4))(2) (1), [Ni(12)Na(2)(OH)(4)(N(3))(8)(pao)(12)(H(2)O)(10)](OH)(2) (2), and [Ni(5)(ppko)(5)(H(2)O)(7)](NO(3))(5) (3) (paoH = pyridine-2-carba…
The glass transition and physical aging processes of poly(L-lactide) (PLLA) were studied by variable-temperature Fourier transform infrared (FTIR) spectroscopy and (13)C solid-state NMR spectroscopy. The glass transition temperature (T(g)) of PLLA can be well determined from the temperature-dependent FTIR intensity. N…
Abstract This is the first report on a thermoformable bionanocomposite based on a natural nanocrystal and formed by grafting long polymer chains onto the surface of microcrystalline cellulose. For the cellulose nanocrystal ‐graft‐ poly( ε‐ caprolactone), the “graft from” strategy contributed to long and dense “plastic…
Single crystal diamond produced by chemical vapor deposition (CVD) at very high growth rates (up to 150 microm/h) has been successfully annealed without graphitization at temperatures up to 2200 degrees C and pressures <300 torr. Crystals were annealed in a hydrogen environment by using microwave plasma techniques for…
Light-driven water oxidation occurs in oxygenic photosynthesis in photosystem II and provides redox equivalents directed to photosystem I, in which carbon dioxide is reduced. Water oxidation is also essential in artificial photosynthesis and solar fuel-forming reactions, such as water splitting into hydrogen and oxyge…
We report the magnetic properties of magnetic nano-composite, consisting of different quantity of NiFe2O4 nanoparticles in polymer matrix. The nanoparticles exhibited a typical magnetization blocking, which is sensitive on the variation of magnetic field, mode of zero field cooled/field cooled experiments and particle…
We present and discuss an algorithm to identify and characterize the long icosahedral structures (staggered pentagonal nanowires with 1-5-1-5 atomic structure) that appear in Molecular Dynamics simulations of metallic nanowires of different species subjected to stretching. The use of the algorithm allows the identific…
The interface structure of Fe/MgO(100) magnetic tunnel junctions predicted by density functional theory (DFT) depends significantly on the choice of exchange and correlation functional. Bader analysis reveals that structures obtained by relaxing the cell with the local spin-density approximation (LSDA) display a diffe…
Aggregated metal nanoparticles exhibit enhanced localized electromagnetic fields that enable highly sensitive vibrational spectroscopy analysis based on surface-enhanced Raman scattering (SERS). We demonstrate SERS detection of organic analytes adsorbed to optically aggregated silver nanoparticles in a microfluidic de…
The spectral and angular radiation properties of gold-silica-gold multilayer nanoshells are investigated using Mie theory for concentric multilayer spheres. The spectral tunability of multilayer nanoshells is explained and characterized by a plasmon hybridization model and a universal scaling principle. A thinner inte…
We have investigated cobaltite relatives of the layered perovskite cuprates and nickelates, ${\text{Pr}}_{2\ensuremath{-}x}{\text{Ca}}_{x}{\text{CoO}}_{4}$ $(0.39\ensuremath{\le}x\ensuremath{\le}0.73)$ and ${\text{La}}_{2\ensuremath{-}x}{\text{Sr}}_{x}{\text{CoO}}_{4}$ $(x=0.4,0.61)$, using elastic neutron scattering.…