Materials Literature
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The present study describes a novel non-radioactive methodology for in vivo non-invasive, real-time imaging of blood-brain barrier (BBB) permeability for conventional drugs, using nitroxyl radicals as spin-labels and magnetic resonance imaging (MRI).
Nanocrystal superstructures are increasingly becoming a subject of intense study. Such materials could constitute a new class of nanocomposites of designed structure, of homogeneous composition, and with unique properties. New phenomena are observed in these materials because of the interaction at such diminutive leng…
Al-doped ZnO nanoneedles with a tip diameter of ∼10 nm and hexagonal zinc aluminum hydroxide were simultaneously synthesized and completely separated in one step. An aqueous solution containing metal ions (Zn 2+ and Al 3+ ), in which a Zn-deposited substrate was immersed, was irradiated with microwaves. Al-doped ZnO n…
A general method is proposed to design the cylindrical cloak, concentrator and superscatterer with arbitrary cross section. The method is demonstrated by the design of a perfect electrical conductor (PEC) reshaper which is able to reshape a PEC cylinder arbitrarily by combining the concept of cloak, concentrator and s…
We demonstrate an ability to control the structures and photodynamics of porphyrin-based nanoassemblies via solvent mixture technique. Surfactants such as ethylene glycol (EG) derivatives with different chain lengths are employed to control the sizes and shapes of nanoparticles composed of meso-substituted tetracarbox…
A statistical segment-scale constitutive equation theory for the nonlinear mechanics and relaxation of polymer glasses recently proposed by two of us is applied to study nonlinear creep and recovery. The key physics resides in a deformation-dependent elastic modulus and alpha relaxation time, which are determined by a…
Despite its wide application, the synthesis of aminopropyl-modified magnesium-phyllosilicates was known only in the case where every silicon atom bore an organic pending group. This paper shows the preparation of aminopropyl-modified talc where tailored amounts of silicon atoms are bound to an aminopropyl group. The d…
Ground-state (GS) and excited-state (ES) properties of novel photomagnetic molecular devices (PMMDs) are investigated by means of density functional theory. These organic PMMDs undergo a ferromagnetic alignment of their intramolecular spins in the lowest ES. They are comprised of: 1) an anthracene unit (An) as both th…
Electronic structure calculations on million-atom samples are employed to investigate the effect of macroscopic deformations on energetics of vacancies in aluminum. We find that volumetric strain associated with a deformation largely governs the formation energies of monovacancies and divacancies. The calculations sug…
In this paper we consider the dynamics of bubbles near a kidney stone subjected to a lithotripter shock wave. We address the effect of kidney stone geometry and composition on the cavitation potential near the stone in a shock wave lithotripter. The analysis is based on the previously developed work metric in which th…
The synthesis system for mesophase formation, using the diprotic anionic surfactant N-myristoyl-L-glutamic acid (C(14)GluA) as the structure-directing agent (SDA) and N-trimethoxylsilylpropyl-N,N,N-trimethylammonium chloride (TMAPS) as the co-structure-directing agent (CSDA), has been investigated and a full-scaled sy…
Abstract We have studied 4d transition metal monoboride, monocarbide, mononitride, monoxide, and monofluorides using density functional method at B3LYP/LanL2Dz level. The lowest spin state, relative stability, bond length, atomic charges, electron affinity, ionization potential, binding energy, and vibrational frequen…
A useful method of modifying the surface of diamond powder with sulfur-containing functionalities was developed by the photolysis of elemental sulfur. The introduction of sulfur-containing functional groups on the diamond surfaces was confirmed by X-ray photoelectron spectroscopy (XPS), diffuse reflectance Fourier tra…
Aligned Cr-doped ZnO nanorods have been successfully fabricated at 600 °C by in situ doping of Cr into ZnO nanorods using a vapor transport approach. Comprehensive structural analyses indicate that dopant Cr occupies Zn sites in ZnO and nanorods align along the [0001] direction. Photoluminescence spectra reveal unusua…
An upgraded version of the sample changer ;CATS' (Cryogenic Automated Transfer System) that was developed on the FIP-BM30A beamline at the ESRF is presented. At present, CATS is installed at SLS (three systems), BESSY (one system), DLS (two systems) and APS (four systems for the LSCAT beamline). It consists mainly of…
We analyze the far field and near field diffraction pattern produced by an amplitude grating whose strips present rough edges. Due to the stochastic nature of the edges a statistical approach is performed. The grating with rough edges is not purely periodic, although it still divides the incident beam in diffracted or…
Structural elucidation of molecules attached to nanoparticle surface holds key to the successful chemical modifications of nanomaterial surface. In this investigation, we effectively optimized 1 H HRMAS NMR conditions and applied one- and two-dimensional techniques to fully characterize ligand structures on surfaces o…
Abstract Bacterial flagellum is a protein nanotube that is helically self‐assembled from thousands of a protein subunit called flagellin. The solvent‐exposed domain of each flagellin on the flagella is genetically modifiable, in that a foreign peptide can be genetically inserted into this domain, leading to the high‐d…
The formation of self-assembled fibrillar networks by low molecular weight peptidomimetics containing a Pro-Val moiety is reported; insight into the aggregation mechanism is provided revealing that it is associated to an unfolding process and that a fibrillar network formed under kinetic control can self-correct into…
Three-dimensionally (3D) mesoporous single-crystalline CaO nano- and microparticles with tri-, tetra-, and hexagonal morphologies have been successfully fabricated using a surfactant (P123, CTAB, or PEG) assisted hydrothermal dissolution−recrystallization strategy with irregular nonporous CaO powders as the starting m…