Materials Literature
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O compósito Al2O3-YAG possui alta resistência à corrosão e à fluência em ambientes agressivos, o que permite vislumbrar aplicações bastante atrativas, tais como aletas de motores a jato e de turbinas a gás. Este compósito também apresenta elevada dureza e alta resistência à abrasão possibilitando o seu emprego em blin…
Adhesion and proliferation of NIH/3Т3 mouse fibroblasts on the surfaces of bacterial copolymer poly(3-hydroxy- butyrate-co-3-hydroxyvalerate) films with different roughness was investigated. Atomic force microscopic analysis showed that surface roughness values of all films were significantly greater (92.0 ± 7.0; 290.…
In order to make better use of nano-nickel oxide particles, hollow nickel oxide fibers (HNOFs) were prepared by electroplating nickel particles on the surface of mesophase pitch based carbon fibers (MPCFs) and then burned off the carbon fibers under air atmosphere. Scanning electron microscopy showed that the HNOFs ha…
One-dimensional (1D) nanostructures represent a unique system for investigating phenomena at the nanoscale and are also expected to play a critical role as both interconnects and functional components in the fabrication of nanoscale electronic devices. Pulsed laser can provide extremely intense energy in a small spot…
A side-by-side comparison between thermoreflectance imaging (TR) and infrared (IR) imaging is made using a specially designed thermal test chip with an embedded diode sensor array. IR thermal imaging is commonly used in industry. However, due to the infrared wavelength and the diffraction limit, IR has limited spatial…
Abstract The concept of the tunneling correlation time according to Schrödinger is presented. This tunneling jumps and the over the barrier jumps (Arrhenius type) correlation times are applied to calculate the autocorrelation functions and spectral densities of a complex motion. Complex motion means that the relaxatio…
The presented investigations will show mathematical approaches in the field of lifetime estimation of ultracapacitor-cells, modules and applications. The focus of this study is laid on the mathematical evaluation of the expected power cycle lifetime and calendar lifetime under known conditions using the Arrhenius equa…
The effect of natural exposure and artificial weathering on selected properties of PP/EVA blends was investigated. The vinyl acetate concentration decreased with exposure time due to acetylation. The most pronounced effect of radiation is associated with oxidative degradation. The cross-linking of PP/EVA blends was at…
Abstract Recently, luminescent nanomaterials with one-dimensional (1D) structured form have been extensively investigated as fluorescent label agents in biology. Among them, 1D nanostructured terbium compounds (for example terbium phosphate) have attracted great attention due to their high-emission efficiency in water…
Present study endeavors to establish the physical basis of an unprecedented trend in scatter, observed in nonlinear ultrasonic (NLU) parameter, associated with varying degree of crystallographic orientation change across crystallites in a polycrystalline material. It is shown that this scatter arises due to anisotropy…
Abstract Impact polypropylene copolymers (ICPs) have complex microstructures compared to homo‐ or random copolymers of propylene. Standard analytical techniques are unable to unpack the complex structure of impact copolymers, hence the need to fractionate the material. The investigation of poly(propylene‐ethylene) blo…
We propose a scheme for determining the effective nuclear charge Z ef CF of a 3d ion placed in a crystal field of arbitrary symmetry. As an example, we consider the Co2+ ion in a matrix MCO3 (M = Ca, Cd). We show that the effective nuclear charge Z ef CF correlates with a change in the degree of the bond covalence.
Directed self-assembly (DSA) of block copolymers is a promising technology for extending the patterning capability of current lithographic exposure tools. For example, production of sub-40 nm pitch features using 193nm exposure technologies is conceivably possible using DSA methods without relying on time consuming, c…
Proton-based chemical shift imaging probes were encapsulated inside nano-carriers to increase the sensivitity of the reporters. Co-encapsulation with a relaxation agent results in improved sensitivity and suppresses background signals. Simultaneous imaging of different chemical shift reporters allows multiplexed detec…
Thermo-sensitive amphiphilic block copolymers, poly(N-isopropylacrylamide)-block- poly(D,L-lactide) (PNIPAAm-b-PLA), were synthesized through a simple free radical copolymerization route based on a bifunctional initiator, 2,2'-azobis(2-methylpropion amidine) dihydrochloride (AMAD), followed by the ring-opening polymer…
Abstract Using a successive method, PAMAM dendrimer‐encapsulated bimetallic PdPt nanoparticles have been successfully prepared with core‐shell structures (Pd@Pt DENs). Evidenced by UV‐vis spectra, high resolution transmission electron microscopy, and X‐ray energy dispersive spectroscopy (EDS), the obtained Pd@Pt DENs…
The mechanical properties of the novel plasticized microcellular PC thin sheets using tributyl citrate as plasticizer and prepared by compression molding have been investigated. The tensile testes showed that the foaming temperature and the TBC content had pronounced effects on the tensile modulus and strength, the st…
Intense highly polarized radiation from silicon nanostructures heavily doped with boron to 5 × 1021 cm−3 is studied as a function of temperature, forward current, and an additional lateral electric field. The features of the radiation intensity and degree of polarization suggest that an important role in the formation…
We present VASP calculations using the HSE functional for carbon, nitrogen, and boron-doped BaTiO 3− x X x (X=C, N, B). We calculate a 40-atom supercell and replace one oxygen atom by C,N, or B. For all three substituents we find a magnetically ordered groundstate which is insulating for C and N and half-metallic for…
The covalently bonded phthalocyanine conjugates with fluorinated single-walled carbon nanotubes (F-SWCNTs) were synthesized and characterized by Raman and IR spectroscopy and TGA/DTG.