Materials Literature
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This paper describes the preparation of wavelength-tunable luminescent Au nanodots (NDs) and Au/Ag NDs at room temperature. Controlling the molar ratios of tetrakis(hydroxymethyl)phosphonium chloride (THPC) to Au ions and of Ag ions to Au ions allows the preparation of different sizes of Au and Au/Ag nanoparticles. We…
In the last few years nanostructure ZnO is being intensively investigated from the growth control, structural and physical characterization, to device performance. There are now increasing interests in a wide range of ZnO-based ternary compound nanostructures offering even larger possibilities. These compounds can be…
We report a direct method to amplify the exponential growth of multilayers significantly by the alternating deposition of polyethylenimine (PEI) at high pH and poly(acrylic acid) (PAA) at low pH. The alternating pH switches the degree of ionization of the polyelectrolytes in the multilayers, which enhances the diffusi…
Yttrium aluminosilicate glasses are of technological importance in photonics, nuclear waste disposal, and as a delivery vehicle for radiation therapy. Their structures are also of great interest in glass science to elucidate the principles of glass formation and structures. We provide classical molecular dynamics simu…
The present work was concentrated mainly on the reaction processes of boro/carbothermal reduction (BCTR) of ZrO 2 with B 4 C and carbon in vacuum, and characterization of morphology and sinterability of the obtained ZrB 2 powder. Combining the thermodynamic calculations, X‐ray diffraction results, and the trend of fur…
A Raman study of a back gated bilayer graphene sample is presented. The changes in the Fermi level induced by charge transfer splits the Raman G band, hardening its higher component and softening the lower one. These two components are associated with the symmetric (S) and antisymmetric vibration (AS) of the atoms in…
We employ scanning tunneling microscopy (STM) to reveal the structure of DNA-carbon nanotube complexes with unprecedented spatial resolution and compare our experimental results to molecular dynamics simulations. STM images show strands of DNA wrapping around (6,5) nanotubes at approximately 63 degrees angle with a co…
Semiconducting single-wall carbon nanotubes under high electric field stress ($\ensuremath{\sim}10\text{ }\text{ }\mathrm{V}/\ensuremath{\mu}\mathrm{m}$) display a remarkable current increase due to avalanche generation of free electrons and holes. Unlike other materials, the avalanche process in such 1D quantum wires…
It is shown theoretically that a giant magnetoelectric susceptibility exceeding ${10}^{\ensuremath{-}6}\text{ }\text{s}/\text{m}$ may be achieved in the ferromagnetic/ferroelectric epitaxial systems via the magnetization rotation induced by an electric field applied to the substrate. The predicted magnetoelectric anom…
We analyze the proper inclusion of electric-field-induced spin splittings in the framework of the envelope function approximation. We argue that the Rashba effect should be included in the form of a macroscopic potential as diagonal terms in a multiband approach rather than the commonly used Rashba term dependent on k…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Photocleavable Poly(styrene-block-ethylene oxide) and Its Self-Assembly into Nanoporous Thin FilmsMinhyuck Kang and Bongjin Moon*View Author Information Department of Chemistry, Sogang University, Seoul 121-742, Korea* Corresponding author. E-mail: [email protected…
Lead‐free (Na 0.52 K 0.48− x )(Nb 1− x − y Sb y )O 3 ‐ x LiTaO 3 (NKNS–LT) piezoelectric ceramics have been fabricated by ordinary sintering. A special attention was paid to the composition design through which the dielectric and piezoelectric properties of the (Li, Ta, Sb) modified NKN systems were significantly prom…
The radio frequency penetration depth was measured in the superconductor $({\text{Ba}}_{0.55}{\text{K}}_{0.45}){\text{Fe}}_{2}{\text{As}}_{2}$ under pulsed magnetic fields extending to 60 T and down to 14 K. Using these data we are able to infer a ${H}_{c2}(T)$, $H\text{\ensuremath{-}}T$ phase diagram, for applied fie…
ADVERTISEMENT RETURN TO ISSUEPREVNoteModeling of the Electrical Percolation of Mixed Carbon Fillers in Polymer-Based CompositesYao Sun, Ha-Da Bao, Zhao-Xia Guo*, and Jian Yu*View Author Information Institute of Polymer Science and Engineering, Department of Chemical Engineering, School of Materials Science and Enginee…
We report very simple and accurate algebraic expressions for the van der Waals (vdW) potentials and the forces between two parallel and crossed carbon nanotubes. The Lennard-Jones potential for two carbon atoms and the method of the smeared out approximation suggested by L.A. Girifalco were used. It is found that inte…
This template will self-destruct: A unique particle-growth mechanism involves growth of new coordination polymers on the surface of initially formed hexagonal blocks and concomitant dissolution of the blocks to form hexagonal tubes (see scheme and scanning electron, optical, and fluorescence microscopy images). Calcin…
The thermodynamic stability of BiFeO 3 is investigated by high temperature X-ray diffraction and isothermal heat treatment of Bi 2 O 3 −Fe 2 O 3 powder mixture as well as phase pure BiFeO 3 prepared by a wet chemical route. Experimental evidence for decomposition of BiFeO 3 to Bi 25 FeO 39 and Bi 2 Fe 4 O 9 in the tem…
A simple derivative of a well-known dye bodipy appears to be a satisfactory sensitizer for singlet oxygen. Moreover, the rate of singlet oxygen generation can be modulated by two cancer-related cellular parameters, sodium ion concentration and acidity. Singlet oxygen generation rate is maximal when sodium ions and an…
In this paper, we successfully synthesized three kinds of typical ZnO micro/nanocrystallites including flakes, columns, and pyramids by means of different facile wet chemical routes. The growth environment plays a crucial role in the morphologies of these ZnO micro/nanocrystallites. At the same time, we find that phys…
Combination therapy, or the use of multiple drugs, has been proven to be effective for complex diseases, but the differences in chemical properties and pharmacokinetics can be challenging in terms of the loading, delivering, and releasing multiple drugs. Here we demonstrate that we can load and selectively release two…