Materials Literature
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Mesoporous Nb 2 O 5 · n H 2 O was prepared using amphiphilic block copolymers (L64, P103, and P123) that acted as structure-directing agents. The pore size in the prepared materials increased with increasing molecular weight of the block copolymer at the same weight percentage of ethylene oxide groups in the following…
Aman P. Mann 1,6 , Rohan C. Bhavane 2 , Anoma Somasunderam 3 , Brenda Liz Montalvo-Ortiz 4 , Ketan B. Ghaghada 2 , David Volk 3 , René Nieves-Alicea 5 , K. Stephen Suh 5 , Mauro Ferrari 6 , Ananth Annapragada 2 , David G. Gorenstein 3 , Takemi Tanaka 4 1 Department of Nanomedicine, University of Texas Health Sc…
Blends of diamidonaphthyridine (Napy) end-functional poly( n -butyl acrylate) (PnBA) and ureidopyrimidinone (UPy) end-functional poly(benzyl methacrylate) (PbnMA) were studied as a function of the component molecular weights to compare with prior theoretical predictions. (1) Macroscopic phase separation was observed t…
The mechanism of the water gas shift reaction (WGSR) on the close-packed transition metal surfaces of Co, Ni, Cu (from the 3d row), Rh, Pd, Ag (from the 4d row), Ir, Pt, and Au (from the 5d row) has been systematically examined by periodic density functional theory (DFT) calculations. The comparison of potential energ…
Research published since 2006 on the synthesis of carbon nanotubes (CNTs) using chemical vapor deposition (CVD) in a fluidized bed reactor is reviewed. A complete account of experimental procedures, including upstream treatments (catalyst preparation, calcination, and reduction), synthesis conditions, and downstream p…
The dielectric response of PbTiO(3)/SrTiO(3) superlattices is studied using electrical and structural measurements. While the dielectric response of paraelectric superlattices is well accounted for by the lattice contribution, superlattices with ferroelectric compositions exhibit an enhanced permittivity. X-ray diffra…
An important challenge in medical diagnostics is to design all-in-one contrast agents that can be detected with multiple techniques such as magnetic resonance imaging (MRI), X-ray computed tomography (CT), positron emission tomography (PET), single photon emission tomography (SPECT) or fluorescence imaging (FI). Altho…
We report the synthesis of tetragonal-phase LiYF 4 nanoparticles doped with upconverting lanthanide ions. The nanoparticles have been characterized by XRD, TEM, and luminescence decay studies. The size of the as-synthesized LiYF 4 nanoparticles can be tuned by varying the precursor ratio of F to lanthanide ions. Passi…
By detailed first-principles calculations we show that the Fermi energy and the Rashba splitting in disordered ternary surface alloys (BiPbSb)/Ag(111) can be independently tuned by choosing the concentrations of Bi and Pb. The findings are explained by three fundamental mechanisms, namely the relaxation of the adatoms…
It is shown that for monolayer graphene electrons are confined on a perfect two-dimensional surface. The implications for the electronic properties of corrugated graphene are discussed in view of a derivation of the constrained relativistic dynamics for the massless carriers in two dimensions in accord with the Heisen…
The successful measurements of a sublattice magnetism with $^{51}\text{V}$ NMR techniques in the sigma-phase ${\text{Fe}}_{100\ensuremath{-}x}{\text{V}}_{x}$ alloys with $x=34.4$, 39.9, and 47.9 are reported. Vanadium atoms, which were revealed to be present on all five crystallographic sites, are found to be under th…
We report on a computer simulation and integral equation study of a simple model of patchy spheres, each of whose surfaces is decorated with two opposite attractive caps, as a function of the fraction chi of covered attractive surface. The simple model explored--the two-patch Kern-Frenkel model--interpolates between a…
Using Landau-Ginzburg-Devonshire approach we calculated the equilibrium distributions of electric field, polarization, and space charge in the ferroelectric-semiconductor heterostructures containing proper or incipient ferroelectric thin films. The role of the polarization gradient and intrinsic surface energy, interf…
The measured induction times in droplet-based microfluidic systems are stochastic and are not described by the deterministic population balances or moment equations commonly used to model the crystallization of amino acids, proteins, and active pharmaceutical ingredients. A stochastic model in the form of a Master equ…
Here we show, combining a simulation and theoretical study, that electrostatic correlations typical of multivalent ions can reverse the selectivity of a biological nanochannel. Our results provide a physical mechanism for a new, experimentally observed phenomenon, namely the inversion of the selectivity of a bacterial…
Hexagonal ${\text{YMnO}}_{3}$ with space group $P{6}_{3}cm$ is one of the rare examples of multiferroic materials that exhibit codependence of a robust ferroelectric phase along with antiferromagnetic ordering. This is primarily ascribed to tilting of the ${\text{MnO}}_{5}$ polyhedra driven by magnetoelectric coupling…
This study aimed to develop a contamination free porous titanium scaffold by a plasma activated sintering within an originally developed TiN coated graphite mold. The surface of porous titanium sheet with or without a coated graphite mold was characterized. The cell adhesion property of porous titanium sheet was also…
We consider theoretically the relaxation of electron spin component parallel to the growth direction in multiple (110) GaAs quantum wells. The sources of spin relaxation are the random Rashba spin-orbit coupling due to the electric field of donors and spin-flip collisions of electrons from different quantum wells. We…
Subwavelength structures (SWSs) with a parabola shape are fabricated by a combination of laser interference lithography of a photoresist (PR), thermal reflow, and subsequent pattern transfer. The SWSs show antireflection properties in a broader wavelength range than conventional cone-shaped SWSs, and have potential in…
Hall hole mobility of boron-doped homoepitaxial (100) diamond samples has been investigated in the temperature range of 100--900 K, both experimentally and theoretically. The temperature dependence of the mobility measured in high-quality and low boron-doped materials was compared with theoretical calculations to dete…