Materials Literature
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Two examples of supramolecular tetrads containing Sn(IV) porphyrin, expanded thiaporphyrins such as sapphyrin and rubyrin, and Ru(II) porphyrin assembled using non-interfering cooperative tin(IV)-oxygen and ruthenium(II)-nitrogen coordination properties are described. These are the first examples in which the expanded…
The application of nanotechnology to biomedical research is expected to have a major impact leading to the development of new types of diagnostic and therapeutic tools. One focus in nanobiotechnology is to develop safe and efficient drug/gene delivery vehicles. Research into the rational delivery and targeting of phar…
A new layered molybdenum cobalt phosphate, Na(2)[Co(H(2)O)(6)][(Mo(16)O(32))Co(16)(PO(4))(4) (HPO(4))(16)(H(2)PO(4))(4)(OH)(4)(C(10)H(8)N(2))(4)(C(5)H(4)N)(2)(H(2)O)(6)]·4H(2)O (1), has been hydrothermally synthesized and structurally characterized. 1 crystallizes in the monoclinic space group P2(1)/n with a = 15.6825…
Neutron diffraction was used to investigate the structure of the liquid alloys Au${}_{0.81}$Si${}_{0.19}$, Au${}_{0.72}$Ge${}_{0.28}$, and Ag${}_{0.74}$Ge${}_{0.26}$ with composition at or near the eutectic. For a given alloy, the measured pair distribution function is described over a wide range of distances, from 5-…
Iron corroles modified with a xanthene scaffold are delivered from easily available starting materials in abbreviated reaction times. These new iron corroles have been spectroscopically examined with particular emphasis on defining the oxidation state of the metal center. Investigation of their electronic structure us…
Nanoengineered poly(methacrylic acid) hydrogel capsules (PMA HCs) are promising candidate carriers for biomedical applications, especially in the areas of drug delivery, encapsulated catalysis, and cell mimicry. The assembly, stability, and degradation of these carriers, as well as their use for the encapsulation of t…
Analysis of effluents from various power plants indicates that, in addition to arsenic (As), these effluents also contain such ions as fluorides, nitrates, chlorides, carbonates, sulfates, and phosphates. Adsorption is considered the method of choice for the treatment of waste streams containing As. Of concern, theref…
Abstract We report the synthesis of a series of conjugated zinc porphyrin oligomers designed as photodynamic therapy agents. These compounds exhibit exceptionally high two‐photon absorption cross‐sections, redshifted linear absorption spectra, and high singlet oxygen quantum yields, making them ideal for one‐photon‐ a…
An experimental study on the capillary filling of nanoporous silicon with different fluids is presented. Thin nanoporous membranes were obtained by electrochemical anodization, and the filling dynamics was measured by laser interferometry, taking advantage of the optical properties of the system, related with the smal…
Glucose sensor: Glucose-binding protein (GBP) covalently conjugated to a fluorescent single-walled carbon nanotube (SWNT) is shown to act as an optical switch. Hinge-bending response to glucose causes a reversible exciton quenching of the SWNT fluorescence with high selectivity (see scheme).
Based on the different sensitivities of material properties to temperature between ultrahigh temperature ceramics (UHTCs) and traditional ceramics, the original empirical formula of temperature-dependent Young's modulus of ceramic materials is unable to describe the temperature dependence of Young's modulus of UHTCs w…
A dual patterned conducting polymer array combined with polymer brushes has been fabricated using a facile and novel approach. The method involved a Langmuir-Blodgett-like deposition of latex microsphere particles, electropolymerization, and polymer brush synthesis into the inside cavities of the highly ordered macrop…
One of the most promising candidates for the construction of ultrahigh-density storage media is low-dimensional atomic-scale magnetic nanostructures exhibiting magnetic bi- or multistability. Here we propose a novel route of locally controlling and switching magnetism in such nanostructures. Our ab initio studies reve…
Several quantum paramagnets exhibit magnetic-field-induced quantum phase transitions to an antiferromagnetic state that exists for ${H}_{c1}\ensuremath{\le}H\ensuremath{\le}{H}_{c2}$. For some of these compounds, there is a significant asymmetry between the low- and high-field transitions. We present specific heat and…
The synthesis of poly (acrylic acid) [PAA]-coated superparamagnetic Fe 3 O 4 nanoparticles was carried out in two ways, either by thermal decomposition of an organometallic iron precursor or by coprecipitation of aqueous solutions of ferrous and ferric chloride salts. PAA-coated particles obtained in the former route…
Noble metal nanoparticle clusters underlie a variety of plasmonic devices and measurements including surface-enhanced Raman spectroscopy (SERS). Because of the strong dependence of plasmonic properties on nanoparticle cluster aggregation state, the elimination of non-SERS-active structures and the refinement of the na…
The density distributions and fluctuations in grids of varying size in liquid water at ambient pressure, both above the freezing point and in the supercooled state, are analyzed from the trajectories obtained from large-scale molecular dynamics simulations. It is found that the occurrence of low- and high-density regi…
Ab initio electronic structure calculations are reported for the simplest (layered) Aurivillius compound, Bi${}_{2}$${\mathit{WO}}_{6}$, elucidating the role of the asymmetric Bi $6s$ lone-pair structure on the stability of the ferroelectric phase and the band structure. In contrast with the conventional view, where t…
A two-dimensional array of gold nanotriangles inscribed onto glass coverslips were optimized for the surface-enhanced Raman detection of streptavidin/biotin monolayer assemblies. The nanostructures were fabricated by electron beam lithography, and its optical parameters were optimized to be probed under a Raman micros…
The effect of multivalent manganese doping on the defect structure is studied for the “lead‐free” piezoelectric [Bi 0.5 Na 0.5 ]TiO 3 (BNT) by means of high‐frequency electron paramagnetic resonance (EPR) spectroscopy. The results show that manganese is incorporated with di‐ and trivalent oxidation states on a titaniu…