Materials Literature
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Novel tetraazachlorin (TAC)-fullerene (C60) conjugates (TAC-C60) and their analogues (TAiBC-C60 and TABC-C60 where TAiBC = tetraazaisobacteriochlorin and TABC = tetraazabacteriochlorin) have been synthesized by condensing 1,2-dicyanofullerene (1) and phthalonitrile derivatives (2) in the presence of nickel chloride in…
Dome-shaped gold nanoparticles (with an average diameter of 10.5 nm) are grown on H-terminated Si(100) substrates by simple techniques involving electro- and electroless deposition from a 0.05 mM AuCl3 and 0.1 M NaClO4 solution. XPS depth profiling data (involving Au 4f core-level and valence band spectra) reveal for…
X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) techniques at both Fe and Co K-edges were used to investigate the formation of CoFe 2 O 4 nanoparticles embedded in a silica aerogel matrix as a function of calcination temperature and CoFe 2 O 4 content. In particular, nanocompos…
Abstract The isothermal crystallization of HDPE/POSS (polyhedral oligomeric silsesquioxane) nanocomposites (POSS content varying from 0.25 to 10 wt %) was studied using differential scanning calorimetry (DSC) technique. The Avrami model could successfully describe the isothermal crystallization behavior of the nanocom…
Abstract Nanocomposites of modified chitosan, carboxymethyl chitosan (CMCh) with hydroxyapatite (HAP) have been prepared by coprecipitation technique. Totally three nanocomposites containing 80/20, 50/50, and 20/80 of HAP/CMCh have been prepared and were characterized by using transmission electron microscopy (TEM), X…
We report measurements of the full intrinsic optical anisotropy of isolated single-wall carbon nanotubes (SWNTs). By combining absorption spectroscopy with transmission ellipsometry and polarization-dependent resonant Raman scattering, we obtain the real and imaginary parts of the SWNT permittivity from aligned semico…
Ordered nanoporous silica films have attracted great interest for their potential use to template nanowires for photovoltaics and thermoelectrics. However, it is crucial to develop films such that an electrode under the nanoporous film is accessible to solution species via facile mass transport through well-defined po…
Twinned zigzag SiC nanoneedles have been synthesized by silicon evaporation onto multiwall carbon nanotubes (MWCNTS) at 1500 °C for 8 h. The product was characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and high-resolution electron transmission microscope (HRTEM). The resul…
Anionic ring-opening polymerization and copolymerization of allyl glycidyl ether (AGE), tert -butyl glycidyl ether ( t BuGE), and ethoxyethyl glycidyl ether (EEGE) was performed using potassium 3-phenyl-1-propanol as initiator. The polymers poly(AGE), poly( t BuGE), poly(EEGE) as well as poly(AGE- co - t BuGE), poly(A…
Diphenylacetylene monomers functionalized with vinyl and ester groups ( 1 and 2 ) were synthesized. The monomers were polymerized by WCl 6 −Ph 4 Sn into their corresponding polymers (P 1 and P 2 ) with the (meth)acrylic functionality remained intact, as verified by the structural analysis of the polymers using spectro…
Evolution of G-band modes of single metallic carbon nanotubes with the Fermi level shift is examined by simultaneous Raman and electron transport studies. Narrow Lorentzian line shape and upshifted frequencies are observed near the van Hove singularities. However, all G modes soften and broaden at the band crossing po…
This paper describes the control of the nucleation and growth of calcite crystals by a matrix composed of an agarose hydrogel on top of a carboxylate-terminated self-assembled monolayer (SAM). The design of this matrix is based upon examples from biomineralization in which hydrogels are coupled with functionalized, or…
The crystal structure of the late lanthanoids' catena-polyphosphates Ln(PO3)3 (Ln=Tb-Yb) is incommensurately modulated (Dy(PO3)3: space group Cc(0beta0)0; Z=4; a=1417.4(4), b=670.96(14), c=1009.5(3) pm; beta=127.62(2) degrees, q=0.364b*; Rall=0.057, wRall=0.071; 293 K) and consists of infinite chains of corner-sharing…
Abstract Polypropylene blends with polyhedral oligomeric silsesquioxanes (POSS) bearing different alkyl groups were investigated to elucidate the effect of the alkyl group length on the mechanical behavior of the blends. In particular, blends of polypropylene (PP) with either octamethyl‐POSS, octaisobutyl‐POSS, or iso…
We report the creation and properties of colloidally stable shell-cross-linked cylindrical organometallic block copolymer micelles with adjustable length and swellability. The one-dimensional (1D) structures with semicrystalline polyferrocenylsilane (PFS) cores and polyisoprene (PI) coronas were initially self-assembl…
The structural environment of substitutional Cr3+ ion in MgAl2O4 spinel has been investigated by Cr K-edge Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Structure (XANES) spectroscopies. First-principles computations of the structural relaxation and of the XANES spectrum have been per…
$(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}$ is a quasi-one-dimensional organic conductor and superconductor with ${T}_{c}=1.4\text{ }\text{ }\mathrm{K}$, and one of at least two Bechgaard salts observed to have upper critical fields far exceeding the paramagnetic limit. Nevertheless, the $^{77}\mathrm{Se}$ NMR Knight s…
It has recently been suggested that exchange spring media offer a way to increase media density without causing thermal instability (superparamagnetism), by using a hard and a soft layer coupled by exchange. Victora has suggested a figure of merit xi = 2 E_b/mu_0 m_s H_sw, the ratio of the energy barrier to that of a…
This paper reports the synthesis of platelike CeO 2 nanoparticles by a simple, cost-effective, and environmentally friendly method using cerium(III) acetate hydrate and freshly extracted egg white (ovalbumin) in an aqueous medium. A platelike structure of CeO 2 nanoparticles having the particle size of 6−30 nm was obt…
We describe the synthesis, characterization, and use of hybrid nanoparticles with a superparamagnetic iron oxide (SPIO)−silica core and a gold nanoshell. These multifunctional nanoparticles, designated SPIO−Au nanoshells, displayed superparamagnetic characteristics and a significant absorbance in the near-infrared (NI…