Materials Literature
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The wetting behavior of water droplets on periodically structured hydrophobic surfaces was investigated. The effect of structure geometry, roughness, and relative pore fraction on the contact angles was investigated experimentally for droplets of size comparable to the size of the structures. It was found that surface…
Realistic models of amorphous ZrO2 are generated in a ``melt-and-quench'' fashion using ab-initio molecular dynamics in a plane-wave pseudopotential formulation of density-functional theory. The structural properties of the resulting amorphous models are analyzed, with special attention to coordination statistics. The…
We report that the electrical conductance between closely-spaced gold electrodes in acid solution can be turned from off [insulating; I] to on [conducting; C] to off again by monotonically sweeping a gate voltage applied to the solution. We propose that this ICI transistor action is due to an electrochemical process d…
We study the homogeneous nucleation process in Stillinger-Weber silicon in the NVT ensemble. A clear first-order transition from the liquid to crystal phase is observed thermodynamically with kinetic and structural evidence of the transformation. At 0.75 T_m, the critical cluster size is about 175 atoms. The lifetime…
We present a statistical mechanics approximation scheme for the explicit treatment of spacer-mediated configurational correlations among the mesogenic units that form a dimer molecule. The approximation is applied to the description of the nematic phase of linear uniaxial dimers interacting via a standard molecular pa…
The microscopic model in which nodes interacting with each other are statistical systems is introduced. The nodes conditions are connected with a string of distinct microscopic configurations and depend on external parameters (pressure and temperature). In this model the consequent description of first- and second-ord…
Time-dependent density functional theory is extended to include dissipative systems evolving under a master equation, providing a Hamiltonian treatment for molecular electronics. For weak electric fields, the isothermal conductivity is shown to match the adiabatic conductivity, thereby recovering the Landauer result.
Carbon nanotubes with their outstanding electrical and mechanical properties are suggested as interconnect material of the future and as switching devices, which could outperform silicon devices. In this paper we will introduce nanotubes, specify the applications, where nanotubes can contribute to the advancement of M…
We used an epoxysilane/aminosilane coating deposited from an aqueous solution to strengthen flat glass. We studied film formation, interfacial and mechanical properties of the film. The film is highly cross-linked with a 6 GPa Young's modulus and good adhesion. Our results suggest that crack face bridging accounts for…
Despite great advances in computation, materials design is still science fiction. The construction of structure-property relations on the quantum scale will turn computational empiricism into true design.
Magnetic nanoparticles have been advocated for use in magnetic resonance (MR) image enhancement and as bio-carriers in biological systems for many years. However it is only in recent years that the fields of nanotechnology, materials science and cell biology have combined to enable us to fully comprehend the potential…
A general methodology that utilizes confined mesoporous silica as template for preparing highly ordered mesostructured nanowires and nanowire arrays is developed. The prepared Ag, Ni, and Cu 2 O nanowires, with unprecedented mesostructures of coaxially multilayered helical, and stacked-donut structures, have the uniqu…
Molecular dynamics simulations based on an empirical potential energy surface were used to study iron catalyzed nucleation and growth of single-walled carbon nanotubes (SWNTs). The simulations show that SWNTs grow from iron-carbide particles at temperatures between 800 and 1400 K, whereas graphene sheets encapsulate t…
This paper describes the synthesis of silver nanoparticles in a continuous flow tubular microreactor using silver pentafluoropropionate as a single-phase reactant precursor. This precursor can be thermally reduced in isoamyl ether to form silver nanoparticles in the presence of trioctylamine. The reaction is suitable…
Human mesenchymal stem cells (hMSC) derived from bone marrow aspirates can form the basis for the in vitro cultivation of autologous tissue grafts and help alleviate the problems of immunorejection and disease transmission associated with the use of allografts. We explored the utility of hMSC cultured on protein scaff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic TTF-Based Charge-Transfer ComplexesToshiaki Enoki and Akira MiyazakiView Author Information Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan Cite this: Chem. Rev. 2004, 104, 11, 5449–5478Publication Date (Web)…
Bone marrow mesenchymal stem cells (MSCs) can differentiate into a variety of cell types, including vascular smooth muscle cells (SMCs), and have tremendous potential as a cell source for cardiovascular regeneration. We postulate that specific vascular environmental factors will promote MSC differentiation into SMCs.…
Nearly monodisperse ZnSe and ZnS nanocrystals were formed in noncoordinating solvents using alternative precursors. The parameter window for the growth of high quality zinc chalcogenide nanocrystals was found to be much narrower than that of the corresponding cadmium chalcogenide nanocrystals. In contrast to syntheses…
Materials science has traditionally involved the study of the self-assembly of atoms or molecules into bulk thermodynamic phases. In her Perspective, Glotzer predicts that this field will be revolutionized by new materials made from larger, more complex building blocks designed to assemble in specific ways. These buil…
The first discrete, selenium-centered tetranuclear zinc cluster [Zn4(mu4-Se)[Se2P(OPr)2]6] was isolated and characterized. The cluster consists of six edge-bridged dsep ligands with four zinc atoms in a slightly distorted tetrahedron and a mu4-Se atom in the center. In addition, 12 mu2-bridging selenium atoms form a S…