Materials Literature
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Five Mn 3Zn 2 heterometallic complexes have been synthesized and structurally and magnetically characterized. Spin ground states up to S = 6 have been observed for these complexes and are shown to depend on the cocrystallizing cation and on the terminal ligand. Large axial zero-field interactions ( D = -1.16 K) are th…
A series of ZnS nanostructures with controllable crystal phase and morphology were synthesized by a solvothermal method using Zn(NCS) 2 (C 5 H 5 N) 2 as a precursor. Nanospheres, microflowers, and microspheres assembled with hexagonal or cubic nanocrystals were obtained in different solvents. Phase evolution of ZnS in…
In this paper, we introduce the use of fluorescence lifetime correlation spectroscopy to study the metal-fluorophore interactions in solution at the single-fluorophore level. A single-stranded oligonucleotide was chemically bound to a 50-nm-diameter single silver particle, and a Cy5-labeled complementary single-strand…
Enantiomerically pure functional polycarbonate was synthesized from a novel seven-membered cyclic carbonate monomer derived from naturally occurring L-tartaric acid. The monomer was synthesized in three steps and screened for polymerization with four commercially available lipases from different sources at 80 degrees…
The purpose of this study was to design and prepare macromolecular contrast agents (CAs) with a precisely defined globular structure for MR angiography and tumor angiogenesis imaging. Generations 1 through 3 (Gd-DOTA-monoamide)-poly-L-lysine octasilsesquioxane dendrimers were prepared as nanoglobular MRI CAs. The nano…
An isolated double-hole indentation, with concentric rings, in a metal film was used to obtain highly localized surface-enhanced Raman scattering (SERS) from regions much smaller than the optical wavelength. The structure was created by a focused ion beam (FIB) milling partially through the 100 nm thick gold film to a…
There is a demand for more efficient and tissue-specific MRI contrast agents and recent developments involve the design of substances useful as molecular markers and magnetic tracers. In this study, nanoparticles of gadolinium oxide (Gd2O3) have been investigated for cell labeling and capacity to generate a positive c…
The biomimetic structure of a polymer hydrogel bearing phosphorylcholine groups was obtained from 2-methacryloyloxyethylphosphorylcholline (MPC) and a novel crosslinker, 2-(methacryloyloxy)ethyl-N-(2-methacryloyloxy)ethyl]phosphorylcholine (MMPC), to prepare biocompatible ocular materials. MMPC is a dimethacrylate wit…
Alloyed composition of semiconductor nanocrystals opens up additional perspectives in engineering materials with different electronic and optical properties. We demonstrate a successful synthesis of water soluble alloyed CdSe x Te 1- x and CdS x Te 1- x nanocrystals stabilized with short-chain thiols by simultaneous u…
Small Bi nanoparticles prepared upon reduction of Bi-III compounds catalyze the growth of thick CdSe nanowires (see image). The control of Bi particle and CdSe nanowire growth rate allows adjustment of the dimensions of the nanowires, which is important for the preparation of various types of nanowires in solution.
The present article highlights recent findings in the field of photoactivation of anticancer metal complexes. Developments of some photoactivatable Rh-, Pt-, and Fe-based complexes are discussed and their mechanisms of anticancer action are outlined. Features required for the successful design of photoactive drugs are…
The polyethylene glycol (PEG) modified gold nanoparticle complex was synthesized by a one-solution synchrotron x-ray irradiation method. The impact on the structure and morphology of the gold nanoparticles of process parameters such as the PEG molecular weight, the PEG/gold molar ratio and the x-ray dosage were invest…
In this paper we present the evaluation of contact materials for a MEMS thermal switch. The contact materials considered were liquid-metal micro-droplets and aligned carbon nanotube arrays. Five switch configurations were tested. The thermal interfacial resistance of the switches was measured. The liquid metal switch…
We present very low temperature scanning tunneling microscopy and spectroscopy (STM/S) measurements in W-based amorphous superconducting nanodeposits grown using a metal–organic precursor and a focused-ion-beam. The superconducting gap closely follows s-wave Bardeen–Cooper– Schrieffer theory, and STS images under magn…
Luminescent inorganic nanoparticles are now widely studied for their applications as biological probes for in vitro or in vivo experiments. The functionalization of the particles is a key step toward these applications, since it determines the control of the coupling between the particles and the biological species of…
Chiroptical switching materials in the visible and near-infrared spectral regions have been realized using a low molecular weight gel as a chiral scaffold and electrochromic chromophores as a stimulus-responsive trigger and operate as a result of the change in the electronic states of the chromophores within the chira…
Two novel scaffold models made of chitosan fibers were designed, fabricated, and investigated. Raw chitosan fibers were either tightened between plastic rings or were processed into stand-alone scaffolds. Chitosan fiber scaffolds were further modified by coating with a thin layer of fibrillar collagen type I to biolog…
A novel pH-sensitive nanoparticle drug delivery system for doxorubicin (DOX) is prepared. Pullulan, a natural biocompatible polysaccharide, was partly carboxymethylized; hydrazine hydrate was condensed with the carboxyl groups forming hydrazide. The hydrazide was coupled with DOX through the formation of hydrazone bon…
We calculate the energy and heat capacity of a liquid on the basis of its elastic properties and vibrational states. The experimental decrease of liquid heat capacity with temperature is attributed to the increasing loss of two transverse modes with frequency $\ensuremath{\omega}<1/\ensuremath{\tau}$, where $\ensurema…
Hybrid Au/Ag nanorods (NRs) are synthesized by initiating secondary growth on premade Au NRs stabilized with tightly binding binary surfactants. By utilizing long, thin Au NRs and carefully manipulating the reduction conditions, Au/Ag hybrid nanostructures are achieved either in the form of Ag-capped tips or as a unif…