Materials Literature
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We propose a kind of folded geometry in bipolar coordinates. Transformation optics in such folded geometries has many intriguing applications, such as a kind of conceptual devices that can exactly cancel the scattering of a prespecified external object and thereby make it invisible. Numerical simulations are performed…
Scaffold-guided vascular tissue engineering has been investigated as a means to generate functional and transplantable vascular tissue grafts that increase the efficacy of cell-based therapeutic strategies in regenerative medicine. In this study, we employed confocal microscopy and three-dimensional reconstruction to…
Two donor-acceptor molecules with different pi-electron conjugative units, 1-((10-methyl-10H-phenothiazin-3-yl)ethynyl)anthracene-9,10-dione (AqMp) and 1,1'-(10-methyl-10H-phenothiazine-3,7-diyl)bis(ethyne-2,1-diyl)dianthracene-9,10-dione (Aq2Mp), have been synthesized and investigated for their photochemical and elec…
Fe 3+ ‐ or Nb 5+ ‐doped CaCu 3 Ti 4 O 12 (CCTO) ceramics show higher values of both room‐temperature (RT) grain conductivity and dielectric constant than undoped ceramics. Microstructural and structural characterization combined with magnetic properties reveal the coexistence of two components that seem relevant for t…
Abstract Tip, substrate, molecular species, and laser are the four main factors determining the detection sensitivity and spatial resolution of tip‐enhanced Raman spectroscopy (TERS). In this paper, we deal with the tip and molecular species. We will first introduce a simple method to regenerate Au tips fabricated by…
This study focuses on the epitaxial orientation of two polyfluorenes (PF) namely poly(9,9-bis(n-octyl)fluorene-2,7-diyl) (PFO) and poly(9,9-bis(2-ethylhexyl)fluorene-2,7-diyl) (PF2/6) on friction transferred poly(tetrafluoroethylene). PF2/6 films with a single-crystal like orientation are obtained on PTFE substrates a…
Germanium nanoparticles with an average size of 5 ± 1 nm were synthesized by the room-temperature reduction of GeCl4 in ethylene glycol using a solution of NaBH4 in triglyme. By modifying the reaction conditions, other morphologies can also be accessed, including larger spherical particles and nanocubes.
A Eu 2+ ‐doped SiO 2 –Al 2 O 3 –CaO–CaF 2 glass was prepared and converted into a transparent glass ceramic by heat treatment. The crystalline phase and its size were determined by X‐ray diffraction and a transmission electron microscopy. The scintillation of Eu 2+ ions in both glass and ceramic under X‐ray excitation…
The potential of semiconducting nanocrystals or so-called quantum dots (QDs) for lifetime multiplexing has not been investigated yet, despite the increasing use of QDs in (bio)analytical detection, biosensing, and fluorescence imaging and the obvious need for simple and cost-effective tools and strategies for the simu…
Electroconductive hydrogels (ECH) prepared as blends of UV-cross-linked poly(hydroxyethylmethacrylate) [p(HEMA)]-based hydrogels and electropolymerized polypyrrole (PPy) were synthesized as coatings on microlithographically fabricated interdigitated microsensor electrodes (IMEs) and microdisc electrode arrays (MDEAs).…
We present electronic structure calculations of the ultraviolet/visible (UV-vis) spectra of highly active push-pull chromophores containing the tricyanofuran (TCF) acceptor group. In particular, we have applied the recently developed long-range corrected Baer-Neuhauser-Livshits (BNL) exchange-correlation functional. T…
Perpendicularly aligned semiconducting CdSe nanorod arrays were fabricated on ITO-coated glass substrate using porous aluminum oxide (PAO) as a hard template. Nanorod lengths were varied between 50 and 500 nm, while keeping the diameter at 65 nm. The electrochemical photovoltaic performance was found to depend critica…
In this paper, a flatness-based control method is used to control the dc/dc converters of an electrical hybrid system. This system is composed of an ultracapacitor, which is connected in parallel to a fuel cell through a bidirectional converter. This association supplies a load through another dc/dc converter. To cont…
Triphenylphosphine (PPh 3 )-capped 1.8 nm diameter gold nanoparticles (AuNPs) are characterized by a combination of 1 H, 2 H, and 31 P solution- and solid-state NMR. The 31 P{ 1 H} NMR resonance associated with the surface-bound PPh 3 is clearly identified and is present as a broad peak centered at 56 ppm. 31 P and 1…
The use of titanium dioxide nanoparticles (nano-TiO(2)) for the degradation of dichlorodiphenyltrichloroethane (p,p'-DDT) increases the risk of exposure to trace nano-TiO(2) and p,p'-DDT mixtures. The interaction of p,p'-DDT and nano-TiO(2) at low concentrations may alter toxic response relative to nano-TiO(2) or p,p'…
The thermodynamics of self-assembling systems are discussed in terms of the chemical interactions and the intermolecular forces between species. It is clear that there are both theoretical and practical limitations on the dimensions and the structural regularity of these systems. These considerations are made with ref…
At present, nanofilaments are not exclusively based on carbon atoms but can be produced from many inorganic materials in the form of nanotubes and nanowires. It is essential to systematically assess the acute toxicity of these newly synthesized materials since it cannot be predicted from the known toxicity of the same…
The aim of this paper is to present a versatile scheme for the computation of optical properties of solids, with particular emphasis on realistic many-body calculations for correlated materials. Geared at the use with localized basis sets, we extend the commonly known lattice ``Peierls substitution'' approach to the c…
Oxidative polymerization of pyrrole in the 3D nanochannels of [Cu3(BTC)2]n (BTC = benzene-1,3,5-tricarboxylate) produced polypyrrole (PPy) inside the framework. Subsequent isolation of PPy by dissolution of the host framework in ammonia solution gave a functional porous PPy, which contrasts with the conventional bulk-…
We report on the electronic structure of the band-edge biexciton in colloidal CdSe quantum dots using femtosecond spectroscopy and atomistic many-body pseudopotential calculations. Time-resolved spectroscopy shows that optical transitions between excitonic and biexcitonic states are distinct for absorptive and emissiv…