Materials Literature
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The growth of CoC 2 O 4 ·2H 2 O particles during aqueous precipitation has been followed by several electron microscopy techniques. A multiple-stage growth leading to final particles with a core−shell structure has been observed. In the first stage, the primary particles grow and aggregate to form secondary particles…
Carbon monoxide oxidation at platinum electrodes in acid solutions presents a characteristic behavior depending on the presence or not of dissolved CO in the bulk of the solution. In the present paper, bulk CO electro-oxidation is studied on a Pt(111) electrode. A change of the (2 × 2)-3CO overlayer, formed by admitti…
We have studied by small-angle neutron scattering (SANS) the crystallization of syndiotactic polypropylene (sPP) homopolymer in dilute hydrocarbon solution in parallel with the self-assembling behavior of crystalline−amorphous block copolymers of (syndiotactic propylene)- block -poly(ethylene- co -propylene) [sPP−P(E-…
Three pyrene alkanethiol derivatives ( P1, P2, and P3 ) possessing flexible alkyl groups of different lengths were attached to nanoparticles of gold (∼2−3 nm in size) along with dodecanethiol (Au− P1, Au− P2, and Au− P3 ). The photophysical properties of these systems were investigated as a function of (i) distance of…
In this work we have studied pulsed 17 O electron nuclear double resonance (ENDOR) spectra of the Gd 3+ aquo ion and the magnetic resonance imaging (MRI) contrast agent MS-325 in an 17 O-enriched frozen glassy water/methanol solution. The isotropic hyperfine interaction (hfi) constant of the water ligand 17 O was foun…
The morphology and viscoelastic properties of films prepared from bimodal latex blends containing equal weight fractions of soft and hard latex particles were investigated as a function of the particle sizes and the particle size ratio (soft particle diameter/hard particle diameter). Minimum film formation temperature…
Designed polypeptides and electrostatic layer-by-layer self-assembly form the basis of promising research in bionanotechnology and medicine on development of polyelectrolyte multilayer films (PEMs). We show that PEMs can be formed from oppositely charged 32mers containing several cysteine residues. The polypeptides in…
A four-step mechanism is hypothesized for the process of fiber formation by interfacial polyelectrolyte complexation: (1) formation of a polyionic complex film at the interface that acts as a viscous barrier to free mixing; (2) scattering of this complex by a drawing motion, creating submicron “nuclear fibers”; (3) gr…
Combining energetic data from density functional theory with thermodynamic calculations, we have studied in detail selective NO reduction under excess O2 conditions on Ir. We show that excess O2 can readily poison the Ir catalyst for NO reduction and the poisoning starts from a low O coverage on the surface. The adsor…
Semiconducting-only single-walled carbon nanotube (SWNT) network field effect transistors (FETs) have been fabricated by selectively reacting all the metallic SWNTs in the devices with diazonium reagents in a controlled manner. We have shown that the concentration of diazonium reagents used is crucial for selectively…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTStrategies in Making Cross-Linked Enzyme CrystalsJ. Jegan Roy and T. Emilia AbrahamView Author Information Biochemical Processing Section, Regional Research Laboratory (CSIR), Trivandrum 695 019, India Cite this: Chem. Rev. 2004, 104, 9, 3705–3722Publication Date (Web):August 6,…
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We have used the LTLSM technique for a spatially resolved investigation of the microwave transport properties, nonlinearities and material inhomogeneities in an operating coplanar waveguide YBa_2Cu_3O_{7-δ} (YBCO) microwave resonator on an LaAlO_3 (LAO) substrate. The influence of twin-domain blocks, in-plane rotated…
We present first-principles calculations on the band structures of 40 different small diameter $(d)$ single-wall carbon nanotubes (SWCNTs), including 14 chiral ones, employing density functional theory (DFT) within the local density approximation (LDA), using the Vienna ab initio simulation package (VASP). The band ga…
Investigation of transport and magnetic properties of MnTe at low temperatures sInvestigation of transport and magnetic properties of MnTe at low temperatures showed anomalies like negative coefficient of resistance below 100K and a sharp rise in susceptibility at around 83K similar to a ferromagnetic transition. Low…
Using an ab-initio electronic structure method, I study the (111) surfaces of the half-metallic NiMnSb alloy. In all cases there is a very pronounced surface state within the minority gap which destroys the half-metallicity This state survives for several atomic layers below the surface contrary to the (001) surfaces…
We analyze spin splitting of the two-dimensional hole spectrum in strained asymmetric SiGe quantum wells (QWs). Based on the Luttinger Hamiltonian, we obtain expressions for the spin-splitting parameters up to the third order in the in-plane hole wavevector. The biaxial strain of SiGe QWs is found to be a key paramete…
In their comment, A. Hakansson, J. Sanchez-Dehesa, F. Cervera, F. Meseguer, L. Sanchis, and J. Llinares say that our conclusion stating that diffraction prevails over refraction in acoustic lenses whose aperture is of several wavelengths, such as those addressed in our calculations [N. Garcia, M. Nieto-Vesperinas, E.…
In antiferromagnetic nanoparticles magnetization the linear component, $χ_{AF}$H superposed to the saturation one usually complicates the fit of experimental data. We present a method based on scaling laws to determine the variation of $χ_{AF}$ with temperature and to find the temperature dependence of the average mag…
Harrison's tight-binding theory provides an excellent qualitative description of the electronic structure of the elements across the periodic table. However, the resulting band structures are in significant disagreement with those found by standard methods. We developed a new procedure to generate both the prefactors…