Materials Literature
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It is predicted that magnetic anisotropy of a thin magnetic film may be affected by the polarization of a ferroelectric material. Using a Fe∕BaTiO3 bilayer as a representative model and performing first-principles calculations, we demonstrate that a reversal of the electric polarization of BaTiO3 produces a sizable ch…
The inefficiency of nanoparticle penetration in tissues limits the therapeutic efficacy of such formulations for cancer applications. Recent work has indicated that modulation of tissue architecture with enzymes such as collagenase significantly increases macromolecule delivery. In this study we developed a mathematic…
We employ electrostatic force microscopy to study the electrostatic environment of graphene sheets prepared with the micromechanical exfoliation technique. We detect the electric dipole of residues left from the adhesive tape during graphene preparation, as well as the dipole of water molecules adsorbed on top of grap…
PbS colloidal quantum dot photovoltaic devices in a Schottky architecture have demonstrated an infrared power conversion efficiency of 4.2%. Here, we elucidate the internal mechanisms leading to this efficiency. At relevant intensities, the drift length is 10μm for holes and 1μm for electrons. Transport within the 150…
In colloidal systems, the interplay between the short range attraction and long-range repulsion can lead to a low density associated state consisting of clusters of individual particles. Recently, such an equilibrium cluster phase was also reported for concentrated solutions of lysozyme at low ionic strength and close…
We emphasize that there exist four Dirac-type points in the electron energy spectrum of a graphite bilayer near the point $K$ of its Brillouin zone. One of the Dirac points is at the point $K$, and three Dirac points lie nearby. Each of these three points generates the Berry phase $\ensuremath{\pi}$, while the Dirac p…
Gas-phase plasma-synthesized silicon nanocrystals (Si-NCs) are doped with boron (B) or phosphorous (P) during synthesis. The doping efficiency of B is smaller than that of P, consistent with the theoretical prediction of impurity formation energies. Despite vastly different synthesis conditions, the effect of doping o…
Ni, Ir, Pd, Pt, and silver oxide Schottky contacts were fabricated on the Zn-polar face of hydrothermally grown, bulk ZnO. A relationship was found between the barrier height of the contact and the free energy of formation of its “metal” oxide. This is consistent with the dominating influence of oxygen vacancies (VO)…
Using spectroscopic ellipsometry, the room temperature refractive index and absorption versus wavelength of the ferroelectric antiferromagnet bismuth ferrite, BiFeO3, are reported. The material has a direct band gap at 442nm wavelength (2.81eV). Using optical second harmonic generation, the nonlinear optical coefficie…
We present a simple and efficient way to obtain freestanding graphene membranes. On these membranes, we demonstrate that electron-beam induced deposition of carbon can be used to obtain arbitrary patterns with a nanometer-scale resolution. In the case of a periodic grating, we obtain a half-pitch of 2.5nm. Electron-be…
Monte Carlo simulations of homogeneous nucleation for a protein model with an exceedingly short-ranged attractive potential yielded a nonconventional crystal nucleation mechanism, which proceeds by the formation of fractal, low-dimensional aggregates followed by a concurrent collapse and increase of the crystallinity…
Osmotically shrunken liposomes loaded with paramagnetic lanthanide(III) complexes orient in a static magnetic field according to the sign of their magnetic susceptibility anisotropy (Deltachi). The magnitude and sign of Deltachi are modulated by the magnetic properties of the Ln (III) ion, by the structural characteri…
A series of oxalate-bridged iron(III) complexes have been synthesized by the reaction of FeCl 3 with oxalic acid (H 2ox) and XCl, where X is a substituted univalent ammonium or an alkaline cation. We have obtained basically two different types of compounds by varying the nature and the shape of the counterion, with th…
A large anionic UV absorbent has been intercalated into a layered double hydroxide (LDHs) host by ion-exchange of an Zn−Al LDHs-nitrate precursor with a solution of 2-naphthylamine-1,5-disulfonic acid in water. After intercalation of the UV absorbent, the powder X-ray diffraction (XRD) pattern shows that the interlaye…
This paper analyzes the improvement of MgH 2 decomposition by the addition of nickel-based catalysts, mostly carbon-supported nickel catalysts. Our study shows that some experimental parameters such as the catalyst content, its composition, the method of preparation, and milling time strongly affect its activity towar…
Mathematical treatment of light scattering within the Rayleigh-Gans-Debye limit for spheroids with polydispersity in both length and diameter is developed and experimentally tested using cellulosic nanowhiskers (CNW). Polydispersity indices are obtained by fitting the theoretical formfactor to experimental data. Good…
Peptide-based vesicular structures have been the focus of research in the past decade for their potential application as drug delivery agents. We here report the self-assembly of amphiphilic dipeptides containing conformation-constraining alpha,beta-dehydrophenylalanine into nanovesicles. The vesicles can encapsulate…
This paper describes a simple technique for fabricating uniform arrays of metal and metal oxide nanotubes with controlled heights and diameters. The technique involves depositing material onto an anodized aluminum oxide (AAO) membrane template using a collimated electron beam evaporation source. The evaporating materi…
In this work, vitreous samples were prepared in the binary system (100 - x)NaPO3-xMO3 with M = Mo and W and x varying from 10 to 60. The transmittance properties in the UV, visible, and near-infrared were monitored as a function of MO3 concentration. In both cases, an increase in the amount of transition metal results…
Two types of dimeric complexes [Ln2(hfa)6(mu2-O(CH2)2NHMe2)2] and [Ln(thd)2(mu2,eta2-O(CH2)2NMe2)]2 (Ln = YIII, EuIII, GdIII, TbIII, TmIII, LuIII; hfa- = hexafluoroacetylacetonato, thd- = dipivaloylmethanato) are obtained by reacting [Ln(hfa)3(H2O)2] and [Ln(thd)3], respectively, with N,N-dimethylaminoethanol in tolue…