Materials Literature
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Normally the size dependence of the chemical potential is used to explain the growth dynamics of semiconductor nanoparticles. Instead we show that very small CdTe nanoparticles continue to grow at high dilution, the growth rate is virtually independent of monomer concentration, nucleation continues after the growth of…
Wettability improvement and bioactive interface designing of poly(dimethylsiloxane) (PDMS) are keen for its application in biodevices. Herein we developed a fully biocompatible approach for achieving stable hydrophilic surfaces by modifying PDMS with hydrophobins. X-ray photoelectron spectroscopy (XPS), water contact…
High-stability sensing of proteins of pig serum albumin (PSA) was achieved using an insulator-covered carbon-nanotube field-effect transistor (CNT-FET) with a top-gate structure. The sensitivity limit of this CNT-FET PSA sensor is at least 5 nmol/L PSA solution. A layer of silicon nitride deposited on the top-gate str…
Several nanostructured manganese oxides with novel shapes were controllably synthesized from the same precursor Na−BirMO via a facile, direct hydrothermal or surging method. The synthesis parameters for nanostructured manganese oxides were investigated, along with their influences on structure, morphology, composition…
A set of water-soluble dendronized polyfluorenes bearing peripheral charged amino groups were synthesized by two steps: (1) Suzuki polycondensation of dendritic macromonomers carrying peripheral Boc-protected amino groups with 1,4-benzenediboronic acid propanediol ester; (2) the deprotection of the resulting Boc-prote…
This paper is concerned with the preparation and use of Mg/Al double-layered hydroxides for boron removal from waste liquor. The structure of the DLHs synthesized is proposed to be Mg 2 AlNa 1.4 (OH) 7.57 Cl 0.03 (NO 3 ) 0.8 · x (H 2 O) which does not contain any carbonate anions. For treating model waters with variou…
Amphiphilic hyperbranched fluorohomopolymer (M(n) = 9.06 kDa, M(w)/M(n)= 1.90) and fluorocopolymer (M(n) = 17.2 kDa, M(w)/M(n)= 2.50) with tri(ethylene glycol) units incorporated at the molecular level were synthesized by atom transfer radical self-condensing vinyl homopolymerization of an inimer, 4-[oxy(tri(ethylene…
High Resolution Image Download MS PowerPoint Slide Supported Pd, Au, and Pd−Au alloy catalysts are characterized with in situ diffuse reflectance infrared Fourier transform spectroscopy of CO adsorption (DRIFTS), quantitative powder X-ray diffraction, and X-ray photoelectron spectroscopy. The spectroscopic results pre…
Dense, ordered arrays of <100>-oriented Si nanorods with uniform aspect ratios up to 5:1 and a uniform diameter of 15 nm were fabricated by block copolymer lithography based on the inverse of the traditional cylindrical hole strategy and reactive ion etching. The reported approach combines control over diameter, orien…
Atoms at liquid metal surfaces are known to form layers parallel to the surface. We analyze the two-dimensional arrangement of atoms within such layers at the surface of liquid sodium, using ab initio molecular dynamics (MD) simulations based on density functional theory. Nearest neighbor distributions at the surface…
Using a Ginzburg-Landau model, we study the phase transition behavior of compressible Ising systems at constant volume by varying the temperature $T$ and the applied magnetic field $h$. We show that two phases can coexist macroscopically in equilibrium within a closed region in the $T$-$h$ plane. It occurence is favor…
Nanoporous films (NPFs) of copper, silver, and gold were directly fabricated on the corresponding metal substrates by a general alloying/dealloying process. This process involved the electrodeposition of Zn on metal surfaces, thermal alloying, and chemical dealloying of Zn. Electrodeposition of Zn on metal substrates…
The interpretation of ferroelectric domain images obtained with piezoresponse force microscopy (PFM) is discussed. The influences of an inherent experimental background on the domain contrast in PFM images (enhancement, nulling, inversion) as well as on the shape and the location of the domain boundaries are described…
We have performed theoretical and experimental studies of field emission from nanostructured semiconductor cathodes. Resonant tunneling through electric-field-induced interface bound states is found to strongly affect the field-emission characteristics. Our analytical theory predicts power-law and Lorentzian-shaped cu…
We show that plasmons in two-dimensional graphene can have net gain at terahertz frequencies. The coupling of the plasmons to interband electron-hole transitions in population inverted graphene layers can lead to plasmon amplification through the process of stimulated emission. We calculate plasmon gain for different…
We report a general click chemistry approach for the layer-by-layer assembly of ultrathin, polymer films on particles and the subsequent formation of polymer click capsules (CCs). Poly(acrylic acid) copolymers, synthesized with a minor component of either alkyne (PAA-Alk) or azide (PAA-Az) functionality, were alternat…
We probe in situ by synchrotron SAXS/WAXS and UV-visible spectroscopy the nucleation and growth of gold nanoparticles. The use of a fast-mixing stopped-flow device enables the assessment of the whole particle formation process with a 200 ms time resolution. The number of particles, their size distribution, and the yie…
A serendipitous finding that ionic liquids gel with carbon nanotubes has opened a new possibility of ionic liquids as modifiers for carbon nanotubes. Upon being ground into ionic liquids, carbon nanotube bundles are untangled, and the resultant fine bundles form a network structure. This is due to the possible specifi…
Composites of 3 mol % Y2O3 in ZrO2, Ce0.9Gd0.1O1.95, and Sc0.1Ce0.01Zr0.89O1.95 were mixed with 8 mol % Yttria Stabilized Zirconia (YSZ) in 50:50 weight ratio to compare the influences in mechanical and electrical properties using a 3- point bending test and AC-impedance spectroscopy, respectively. An SEM was used for…
To improve the performance of the anode-supported Solid Oxide Fuel Cells (SOFCs) which can be operated at an intermediate temperature, the functional layer (FL) is introduced on a Ni- YSZ anode substrate. And the scandia-stabilized zirconia (ScSZ) and the samaria-doped ceria (SDC) which have the high ionic conductivit…