Materials Literature
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This paper investigates the fabrication of substrates for surface-enhanced Raman scattering (SERS) using hard thermoplastic polymers in conjunction with sputtering and electroless deposition of a thin Au or Ag film. In contrast to silicon or glass, plastic materials promote the replication of nanoscale structures over…
Single crystals of the nanoscale polyoxomolybdate wheel, Na(15)Fe(3)Co(16)[Mo(176)O(528)(H(2)O)(80)]Cl(27) x 450 H(2)O, was synthesized by the condensation reaction of Na(0.4)Co(0.8)[MoO(4)] x 1.5 H(2)O at low pH and in the presence of an iron-based reducing agent, and these crystals were characterized by the synchrot…
Electrospinning has been considered a straightforward way of producing nano and micro fibers. In this work we are analyzing variations of the conventional electrospinning process to better understand and explore the effect of electrostatic interactions. The variations we are investigating include the insertion of poly…
In this paper we present a model of Carbon Nanotube Field Effect Transistor (CNTFET) to be used for electronic circuit design. The model, with a classical behaviour (MOSFET-like CNTFET), is based on analytical approximations and parameters extracted from quantum mechanical simulations of the device to avoid the resort…
Hybrid organic-inorganic monomode waveguides of conjugated polymers on porous silicon (PS) substrates have been fabricated. Different low refractive index PS substrates, varying from 1.46 down to 1.18 have been studied. Amplified spontaneous emission (ASE) has been observed for all the samples and the ASE threshold ha…
The cytocompatibility and hydrophilicity tests were performed by culturing mouse fibroblastic cells on films of poly-L-lactic acid (PLLA), poly(L-lactic-co-glycolide) (PLGA) and poly(L-lactide-co-glycolide)/ bioactive glass (PLGA/BG) or in the presence of extracts from these polymeric materials. The solvent casting me…
This paper is devoted to the formulation of new analytical solutions and exploration of physical interpretation for yarn twist propagation in staple yarn spinning. The wave equation governing the twist propagation is solved by using the complex exponential representation of the rotating angle of a yarn cross-section.…
Ternary CdS X Se 1− X single-crystal nanoribbons (NRs) with uniform and controllable compositions (0 < X < 1) were synthesized for the first time via sulfurizing the CdSe nanoribbons. The product was characterized by means of X-ray diffraction, scanning electron microscopy, high-resolution transmission electron micros…
Competitive protein adsorption from human serum onto unmodified polyethylene terephthalate (PET) surfaces and plasma-polymerized PET surfaces, using the monomer diethylene glycol vinyl ether (DEGVE), has been investigated using radioactive labeling. Albumin and immunoglobulin G (IgG) labeled with two different iodine…
A two-step, high-purity, high-yield synthesis of nanoparticulate vanadium dioxide, which has a greater than 10-fold potential cost reduction is reported. This consists of a short reflux of V2O5 with aspartic acid, followed by calcination at 600 degrees C or above. The particles produced have a mean diameter of approxi…
It is well known that thermoplastics such as polyvinyl chloride (PVC) can be toughened by the addition of elastomeric phase. Thus, nitrile butadiene rubber (NBR) was melt mixed with PVC to produce toughened PVC (tPVC). Further, interest in the use of natural fibers as fillers has grown over the past few years due to t…
Preferential CO oxidation in a H 2 -rich stream over ZnO- and ZnO−Fe 2 O 3 -supported nanosize Au catalysts prepared by the deposition−precipitation method has been investigated. The reactant gas mixture contained 1% CO, 1% O 2, 40% H 2, 0−10% CO 2, and 0−10% H 2 O, with the balance being He, at a total flow rate of 5…
We study the surfactant-enhanced spreading of drops on the surfaces of solid substrates. This work is performed in connection with the unique ability of aqueous trisiloxane solutions to wet highly hydrophobic substrates effectively, which has been studied for nearly two decades. We couple a lubrication model to advect…
We report a method for preparing highly photoluminescent, water-soluble CdSe/CdS/ZnS core/shell/shell and CdSe/ZnS core/shell quantum dots (QDs) colloidally stabilized by double hydrophilic copolymers. The polymers, either a diblock copolymer poly(ethylene glycol-b-2-N,N-dimethylaminoethyl methacrylate) (PEG-b-PDMA) o…
We surveyed the role of chemically mediated interactions between the 2 diatom species Skeletonema costatum and Thalassiosira weissflogii. S. costatum promoted the growth of T. weissflogii in non-contact co-cultures, allowing an exchange of exuded metabolites. In contrast, cell counts of S. costatum were not affected b…
Gemeinsam stark – so lautet das Motto für neue Silol-Luminogene, die in festen Aggregaten stärker emittieren als in Form isolierter Moleküle. Die Emission im festen Zustand lässt sich über die Molekülstruktur einstellen: Sperrige Substituenten schwächen die intermolekularen Wechselwirkungen und schränken die Molekülro…
Yttrium fluoride such as Na(Y1.5Na0.5)F6 and α-NaYF4; YF3 has been successfully synthesized via a salt-assisted hydrothermal method in the presence of sodium nitrate. The morphology and chemical composition of the as-obtained products can be controlled by monitoring the reaction parameters inclusive of the time-zero c…
We studied the decomposition reaction kinetics of lithium borohydride (LiBH 4 ) with and without boron as an additive under various hydrogen pressures. The decomposition of LiBH 4 +B was studied by means of differential scanning calorimetry and thermogravimetry. Boron addition improves the dehydrogenation process, res…
Simulations of theoretically informed coarse grain models, where the interaction energy is given by a functional of the local density, are discussed in the context of polymeric melts. Two different implementations are presented by addressing two examples. The first relies on a grid-based representation of non-bonded i…
The potentiality of optical absorption spectroscopy (OAS) for the estimation of mean diameter of single-wall carbon nanotubes (SWCNTs) from electronic transition energies has been explored. The observed dependence of electronic transition energies of both metallic and semiconducting SWCNTs on their mean diameters clea…