Materials Literature
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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…
Using molecular dynamics simulations, we have predicted the thermal conductivity of Bi${}_{2}$Te${}_{3}$ nanowires with diameters ranging from 3 to 30 nm with both smooth and rough surfaces. It is found that when the nanowire diameter decreases to the molecular scale (below 10 nm, or the so-called ``quantum wire''), t…
Practical application of aligned carbon nanotubes (ACNTs) would have to be determined by a matter of its economical and large-scale preparation. In this study, neem oil (also named Margoaa oil, extracted from the seeds of the neem--Azadirachta indica) was used as carbon source to fabricate the bundles of ACNTs. ACNTs…
Abstract Poly(styrene‐β‐isobutylene‐β‐styrene)‐poly(3‐hexylthiophene) (SIBS‐P3HT) conducting composite fibers are successfully produced using a continuous flow approach. Composite fibers are stiffer than SIBS fibers and able to withstand strains of up 975% before breaking. These composite fibers exhibit interesting re…
The low-temperature thermal conductivity ($\ensuremath{\kappa}$) of GdFe${O}_{3}$ single crystals is found to be strongly dependent on magnetic field. The low-field $\ensuremath{\kappa}(H)$ curves show two ``dips'' for $H\ensuremath{\parallel}a$ and only one dip for $H\ensuremath{\parallel}c$, with the characteristic…
We present Raman data on both single-crystal and thin-film samples of the multiferroic PbFe${}_{0.5}$Nb${}_{0.5}$O${}_{3}$ (PFN). We show first that the number and selection rules of Raman lines are compatible with a face-centered-cubic $\mathit{Fm}$-3m structure, as is known in other $\mathit{AB}$O${}_{3}$ relaxors,…
Small-sized PbSe nanocrystals (NCs) were synthesized at low temperature such as 50-80 °C with high reaction yield (up to 100%), high quality, and high synthetic reproducibility, via a noninjection-based one-pot approach. These small-sized PbSe NCs with their first excitonic absorption in wavelength shorter than 1200 n…
Graphene/azo polyelectrolyte multilayer films were fabricated through electrostatic layer-by-layer (LbL) self-assembly, and their performance as electrochemical capacitor electrode was investigated. Cationic azo polyelectrolyte (QP4VP-co-PCN) was synthesized through radical polymerization, postpolymerization azo coupl…