Materials Literature
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Nanocrystalline NiFe 2 O 4 (Nickel Ferrite) particles were synthesized using the coprecipitation technique and subsequently their nonlinear optical properties were studied using the open aperture Z-Scan experiment employing nanosecond and femtosecond laser pulses. A significant optical limiting is observed in both cas…
The final goal of this study is to develop multi-functional organic/inorganic hybrid nanoparticles, which can be utilized as biomedical imaging probes and drug delivery carriers. As an initial step toward this goal, we encapsulated CdSe/ZnS quantum dots (QDs) into poly(ethylene glycol)-b-poly(D,L-lactide) (PEG-PLA) mi…
Structural variations of SiOx matrix have been studied with Fourier Transform Infrared Spectroscopy (FTIR) during the formation of Si and Ge nanocrystal. Two frequently used methods, magnetron sputtering and ion implantation have been employed to form SiOx matrix containing excess Si and Ge. The Si-O-Si stretching mod…
ZnO nanorods are fabricated on glass substrate by spin-coating sol-gel process using non-basic aged solution and annealing. Sample solutions reserved in room temperature for different time (one day, one month, two months and four months) are prepared for the experiment. The morphology study indicates that the aging ti…
Abstract About 150 samples from core representing nearly a complete section of the Niobrara Formation in the Berthoud State No. 3 well, Berthoud Field, Larimer County, Colorado, were analyzed for insoluble residues, carbonate content, and bulk-rock and clay mineralogies. The Smoky Hill Chalk Member contains mostly imp…
A discontinuous foaming process has been employed to investigate the effects of two types of fillers - calcite (CaCO 3 ) and dolomite (CaMg(CO 3 ) 2 ) on the morphological and mechanical properties of flexible polyurethane foam. The particle sizes of the fillers: 6 nm, 3.5µm, and 0.84 mm vary from composition ranges o…
The studies aimed at an analysis of the formation and growth kinetics of zinc coating on reactive silicon-killed steels in a zinc bath. The growth kinetics of the produced zinc coatings was evaluated basing on the power-law growth equation. As regards galvanizing of the surface of products, investigation was done for…
Heterometallic N-bridged complex PcFeNMnPc (Pc – tetra-tert-butylphthalocyanine) was synthesized by interaction of PcMnV≡N with PcFeII. As evidenced from UV-vis, IR and EPR data, this complex can be easily oxidized by dioxygen with formation of a stable green cation-radical with one unpaired electron. In protic solven…
Application of nanotechnology in drug delivery system has opened up new areas of research in sustained release of drugs. The nanoparticles have the advantages of reaching otherwise less accessible sites in the body by escaping phagocytosis and entering tiny capillaries. Sustained release of the drug from the nanoparti…
We report the facile synthesis, formation mechanism, and photoluminescent (PL) properties of gold–poly(thiophene) (Au–PTh) nanoaggregates. They were prepared by one-step oxidative polymerization, in which Au3+ ion was utilized as an oxidizing agent for the polymerization of thiophene. Transmission electron microscopy…
The internal friction phenomenon in metallic and polymeric shape memory materials is analyzed. The experimental results permit validation of a theoretical model which describes qualitatively the temperature dependence of the internal friction for the investigated materials. Moreover, theoretical model accepts not only…
Possible precursor complexes for the aerobic oxidation of benzene to phenol in CuHY zeolites were studied by QM/MM calculations. Structures limited to just one copper center were determined, in which both, benzene and dioxygen are adsorbed to and activated by the same transition metal cation. Frequency analyses reveal…
Treatment of Ca or Sr metal with Hg(C(6)F(5))(2) and 2,4,6-trimethylphenol (HOmes) in 1,2-dimethoxyethane (dme) at room temperature resulted in C-F bond activation, giving rise to the unique fluoro(aryloxo)alkaline earth cages [Ca(5)(mu(4)-F)(mu(3)-F)(4)(mu-Omes)(4)(Omes)(dme)(4)] 1 and [Sr(10)(mu(4)-F)(4)(mu(3)-F)(4)…
We show that high-temperature expansion of the partition function is a computationally convenient tool to interpretation of magnetic properties of spin clusters wherein the spin centers are interacting via an isotropic Heisenberg exchange operator. High-temperature expansions up to order 12 are used to reproduce tempe…
The paper presents traditional analogue and digital techniques in partial discharge measurement. The discharge current pulses are measured from high voltage machines like power plant generators and transformers. The presented modern digital techniques are suitable for all measurements where impulse energy will be calc…
Carbon nanotubes (CNTs) have become strongly promising nano-particles for developing novel smart polymer matrix nanocomposites to satisfy the ever increasing design requirements of the recent avenues of space industry and other special structural applications. The objective of this paper is to investigate the influenc…
Periodic nanoring arrays are prepared by self-assembled poly styrene-block-polymethylmethacrylate (PS-b-PMMA) diblock copolymer under rapid solvent-annealing. The dimension of the nanorings can be modified by controlling the solvent-annealing time.
An electrolyte, N , N ′ -1,4-diethyl, triethylene, and diamine tetrafluoroborate dissolved in glutaronitrile, was developed and investigated in a symmetrical supercapacitor using activated carbon as electrodes (active carbon ∣ active carbon). The electrochemical performance of the simulated supercapacitor was examined…
Life models relate the time to failure to the applied stress. They can be derived starting from knowledge of chemical/physical phenomena involved in the ageing process caused by the stress or by means of regressive techniques on data acquired in ALT-based procedure. Anyway, experimental tests are needed. This paper de…
The Epsilon-Near-Zero (ENZ) super-tunneling structure with weakly coupled cascaded ultra-narrow channels is proposed and demonstrated to have notably wider bandwidth than single stage tunneling structure. An extensive parametric study for such structures is performed to investigate the factors which can afiect super-t…