Materials Literature
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We recently reported simultaneous self-assembly, alignment, and patterning of peptide amphiphile (PA) nanofibers over large areas by a soft lithographic technique termed sonication-assisted solution embossing (SASE). The present work examines the effect of ultrasonication, channel width, and nanofiber persistence leng…
The influence of relativistic effects on the structure, vibrational modes, and reactivity of recently discovered tertrahedral gold clusters (Au 19 and Au 20 ) are investigated using density functional methods. The intramolecular reactivity of the clusters was analyzed using density functional-based reactivity descript…
Using first-principles density-functional calculations, we determine and analyze the Born effective charges ${\text{Z}}^{\ensuremath{\ast}}$ that describe the coupling between electric field and atomic displacements for ferromagnetic double-perovskite compound, ${\text{La}}_{2}{\text{NiMnO}}_{6}$. We find that the Bor…
Structurally well-defined stereoregular diblock copolymers composing of syndiotactic polypropylene (sPP) and polyester have been prepared using controlled ring-opening copolymerization of cyclic esters, including ε-caprolactone and dl -lactide, mediated by aluminum alkoxide end-capped sPP as the macroinitiator. The al…
Cr-doped silica nanospheres (NS) have been synthesized on Si substrates at 700 °C with a chlorine-assisted vapor transport method. CrCl 2 powder not only serves as the source for Cr doping, but also generates chlorine gas, which reacts with the Si substrates and lowers the growth temperature. The diameter and oxygen c…
The high-temperature behaviour of two natural chlorites has been studied by in situ X-ray diffraction: on a single-crystal of clinochlore. triclinic polytype IIb-4, space group C (1) over bar, with pseudomonoclinic metric and composition (Mg(9.14)Fe(2+) (1.02)Fe(0.01)(3+) Mn(0.01)Ti(0.01)Al(1.76))(Sigma=11.95) (Si(6.3…
Abstract In this work, we theoretically examine recent pump/probe photoemission experiments on the strongly correlated charge‐density‐wave insulator TaS 2 .We describe the general nonequilibrium many‐body formulation of time‐resolved photoemission in the sudden approximation, and then solve the problem using dynamical…
The epoxidation of styrene with hydrogen peroxide with higher selectivity to styrene oxide was carried out over lanthanum-doped MCM-48 (La-MCM-48) molecular sieves, in which aqueous NaOH solution was used to adjust the pH value of the reaction solution. The results show that the pH value of the reaction solution has a…
In this paper, olive-like ZnO particles were successfully synthesized via a facile biomineralization process in the template of silk fibroin (SF) peptide at room temperature. The coat of SF peptide on the surface of ZnO particles had a substantial influence on their morphology during the biomineralization. Room-temper…
Drug-nanoparticle conjugates: The anticancer drug camptothecin (CPT) was covalently linked at the surface of ultrasmall superparamagnetic iron oxide nanoparticles (USPIOs) via a linker, allowing drug release by cellular esterases. Nanoparticles were hierarchically built to achieve magnetically-enhanced drug delivery t…
Direct measurements are presented of the Schottky barrier (SB) heights of carbon nanotube devices contacted with Pd electrodes. The SB barrier heights were determined from the activation energy of the temperature-dependent thermionic emission current in the off-state of the devices. The barrier heights generally decre…
Carbon monoxide (CO) oxidation on Pd(111) surfaces has been studied by molecular beam methods with mixed molecular beams (CO + O 2 ) between 400 and 900 K and a CO:O 2 ratio of 7:1 to 1:10. A new aspect of the above reaction observed in the transient kinetics regime is the evidence for oxygen diffusion into Pd(111) su…
Photochromism of spiropyran and thermal reversion of MC in a series of imidazolium-based ionic liquids (ILs) were investigated via fluorescence and UV-vis absorption spectra. The fluorescence emission maxima (lambda(em)) of the colored merocyanine (MC) form is polarity dependent in all ILs and fluorescence intensity e…
Abstract The effect of electron beam irradiation on silk fibroin (SF) fiber‐reinforced poly(ε‐caprolactone) (PCL) composite was investigated by mechanical test, scanning electron microscope, dynamic mechanical thermal analysis, electron paramagnetic resonance (EPR) analysis, and Fourier transform infrared (FTIR) analy…
A new class of 120 degrees dendritic di-Pt(II) acceptor subunits has been designed and synthesized, from which six-component hexagonal metallodendrimers were easily formed with 120 degrees dendritic dipyridine donors via [3 + 3] coordination-driven self-assembly. The structures of all metallodendrimers are confirmed b…
Here, a fluorescent switch is constructed combining hemin, hemin aptamer, and a newly synthesized anionic conjugated polymer (ACP), poly(9,9-bis(6'-phosphatehexyl) fluorenealt-1,4-phenylene) sodium salt (PFHPNa/PFP). In the "off-state", the fluorescence of PFP is sensitively quenched by hemin, with a high K(sv) value…
A number of fully functional proteins have been identified to exist in a partially or fully disordered state. These intrinsically disordered proteins (IDP) are recognized as an important sequence class that fulfill many roles. A number of biomineral-associated proteins, particularly those which possess polyelectrolyte…
meso-Hexakis(pentafluorophenyl) [30]heptaphyrin(1.1.1.1.1.1.0) and meso-hexakis(pentafluorophenyl) [38]nonaphyrin(1.1.0.1.1.0.1.1.0) have been investigated with a particular focus on their photophysical properties affected by protonation with acids using steady-state and time-resolved spectroscopic measurements along…
Density functional calculations have been performed on initial copper deposition and its growth over ZnO nonpolar (101̅0) and (112̅0) surfaces. On (101̅0), our results demonstrate that copper atoms first interact with dangling bonds or bonding orbital above ZnO. As the deposition increases, they form a zigzag structur…
In this paper we describe hierarchical nanoporous ultrathin fibers, which are synthesized using an electrospinning technique and the surfactant-polymer cotemplates. Composite fibers with viscoelastic characters resulting from the driving force of surfactants are first organized by electrospinning a solution containing…