Materials Literature
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Defined properties: Microfluidic reactors have recently emerged as near-ideal systems for the growth of high quality colloidal nanoparticles due to the unprecedented control they offer over reaction conditions (see figure). High quality InP quantum dots are synthesized in simple microfluidic devices, and their spectra…
Protein phosphorylation is an important regulator of both cellular and extracellular events. Recently, protein phosphorylation has also emerged as an important process in biological adhesives. During the last decade, Herbert Waite and his group have indeed characterized several polyphosphoproteins from the adhesive se…
We report an optical modulation of the effective on-site Coulomb energy $U$ on a dimer (${U}_{\mathrm{dimer}}$) for achieving the Mott insulator-to-metal transition in $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{BEDT}\mathrm{\text{\ensuremath{-}}}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_…
Janus silica particles decorated with biotin molecules and poly(ethylene oxide) PEO chains on two hemispheres were prepared by two-step click reactions. Polystyrene (PS) particles coated with azide modified silica particles were used as templates. On the PS surface one hemisphere of a silica particle was exposed to th…
The observed ferromagnetism in Gd-doped GaN appears to arise from lattice defects incorporated along with Gd rather than from Gd itself. A previous model, invoking Ga vacancies as the primary defect responsible for the magnetism is here argued to be unlikely because Ga vacancies have a high energy of formation in the…
Abstract Poly( L ‐lactide) (PLA)/silica (SiO 2 ) nanocomposites containing 1, 3, 5, 7, and 10 wt % SiO 2 nanoparticles were prepared by melt compounding in a Haake mixer. The phase morphology, thermomechanical properties, and optical transparency were investigated and compared to those of neat PLA. Scanning electron m…
Structure of the spin-orbit coupling varies from material to material and thus finding the correct spin-orbit coupling structure is an important step toward advanced spintronic applications. We show theoretically that the curvature in a carbon nanotube generates two types of the spin-orbit coupling, one of which was n…
A novel method was used to synthesize CdS single-crystal nanorods directly in the presence of conjugated polymer poly(3-hexylthiophene-2,5-diyl) (P3HT), where the P3HT is acting as a molecular template for geometrical manipulation of CdS nanocrystals and, in the meantime, as an efficient charge conductor in composite…
We have fabricated the Fe(Se,Te) superconducting wire by a special process based on a powder-in-tube method. The pure Fe tube plays the role of not only the sheath but also the raw material for synthesizing the superconducting phases. We succeeded in observing zero resistivity current on the current–voltage measuremen…
The atomic structure of the polar ZnO(0001) surfaces in a dry and humid oxygen environment is studied combining diffraction experiments and density-functional theory. Our results indicate that for similar stoichiometries a large number of very different, but energetically almost degenerate reconstructions exist. Thus…
A series of solution-processable near-infrared (NIR) electrochromic aromatic polyamides with N, N, N ′, N ′-tetraphenyl- p -phenylenediamine (TPPA) units in the backbone were prepared from the phosphorylation polyamidation reactions of a newly synthesized diamine monomer, N, N ′-bis(4-aminophenyl)- N, N ′-di(4-methoxy…
We report on density functional theory (DFT) calculations of the formation energies and diffusion pathways of oxygen vacancies and Ti interstitials at and near the (101) surface and in the bulk of the anatase polymorph of TiO(2). At the generalized gradient approximation level, both defects are found to be energetical…
We have performed a scanning tunneling microscopy and spectroscopy study of potassium-doped C60 monolayers (KxC60) on Ag(001) in the regime of x ~ 1. Low temperature annealing (640 K) leads to the formation of two well-ordered KxC60 phases that exhibit differing levels of electron charge transfer. Further annealing (7…
We point out that the origin of the commonly occurred boundary temperature jump in the application of No\ifmmode \acute{s}\else \'{s}\fi{}e-Hoover heat bath in molecular dynamics is related to the edge modes, which are exponentially localized at the edge of the system. If heat baths are applied to these edge regions,…
We revisit the controversy, discussed recently by Goldstein in this journal[J. Chem. Phys. 128,154510 (2008)], whether the residual entropy is real or fictional. It is shown that the residual entropy loss conjecture (ELC) at the glass transition, which results in a discontinuous entropy violates many fundamental princ…
A design strategy to control the thermally triggered folding, self-assembly, and subsequent hydrogelation of amphiphilic beta-hairpin peptides in a pH-dependent manner is presented. Point substitutions of the lysine residues of the self-assembling peptide MAX1 were made to alter the net charge of the peptide. In turn,…
Correlated time-dependent density functional theory (TDDFT) quantum mechanical and pseudo-atomistic Monte Carlo (PAMC) statistical mechanical methods have been used to assist in the understanding of and to guide the improvement of organic electro-optic (OEO) materials, prepared by electric field poling of pi-electron…
Here, we report two synthetic oligopeptide-based, thermoreversible, pH-sensitive hydrogels. In gel phase, these self-assembling tetrapeptides form a long interconnected nanofibrilar network structure, as is evident from various microscopic techniques, including field emission scanning electron microscopy (FE-SEM), tra…
In this review, we show that the structure and behavior of single-walled nanotubes (SWNTs) are essentially polymeric; in fact, many have referred to SWNTs as “the ultimate polymer”. The classification of SWNTS as polymers is explored by comparing the structure, properties, phase behavior, rheology, processing, and app…
Neutron scattering is used to probe magnetic excitations in ${\mathrm{FeSe}}_{0.4}{\mathrm{Te}}_{0.6}$ (${T}_{c}=14\text{ }\text{ }\mathrm{K}$). Low energy spin fluctuations are found with a characteristic wave vector ($\frac{1}{2}\frac{1}{2}L$) that corresponds to Fermi surface nesting and differs from ${\mathbf{Q}}_…