Materials Literature
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Impact experiments of man-made rock with different porosities were carried out with Split Hopkinson Pressure Bar (SHPB). The characteristic of energy dissipation and the influence of rock porosity on energy dissipation were investigated during the impact process. Meanwhile, the relation between the energy dissipation…
When the design of a medical device and its intended use as a chronic implant require that the prostheses maintain some minimum level of physical, chemical and biological integrity after implantation in living tissue for some time interval, the materials of which the prosthesis is made should be tasted either individu…
A kaolinit metakaolinitt trtn talakulsnak folyamata mind a mai napig szmos krdst vet fel annak ellenre, hogy maga a dehidratcis folyamat ltszlag kellen ismert s feltrt. A szerzk munkjukban ismertetik a kaolinitsvny kmiai sszettelt, kristlyszerkezeti felptst, a rcspontok tvolsgt s szgeit
Polyelectrolyte multilayer (PEM) thin films were deposited on silk by sequential deposition of Chitosan and polyphosphoric acid. This PEM composition takes advantage of synergetic effect of the phosphorus and the nitrogen to provide an efficient coating, which prevents fiber decomposition at high temperature. Prior to…
In this article, we report on the synthesis and characterization of porous platinum layers on top of highly doped (0.007–0.02 and 0.001 – 0.003 Ω cm ) n-type porous silicon by immersion plating. Porous silicon samples of different morphologies were prepared by electrochemical etching. Plating was performed by simple i…
It was shown that water-insoluble porphyrins solubilized with pluronics (ternary block copolymers of ethylene oxide and propylene oxide) efficiently transfer photoexcitation energy to molecular oxygen dissolved in aqueous media to excite it into the singlet state, which is active in oxidizing organic substrates. It wa…
The pyroelectric, elastic, and electrostrictive properties of lead magnesium niobate-and barium titanate-based solid solutions were studied under a dc electric field near a phase transition. The results obtained for a relaxor transition (in a lead magnesium scandium niobate solid solution) are compared with those deri…
Tissue engineering is a fast-evolving field of biomedical science and technology with future promise to manufacture living tissues and organs for replacement, repair, and regeneration of diseased organs. Owing to the specific role of hemodynamics in the development, maintenance, and functioning of the cardiovascular s…
The R-curve behavior, spherical Hertzian contact damage and cyclic contact damage of a bearing grade Si3N4 ceramic reinforced with TiN particle dispersion are investigated and compared with the performance of a reference Si3N4 ceramic without TiN but with a similar microstructure. These ceramics were produced by firin…
In an effort to improve polymer thermal conductivity (TC), Ultem™ 1000 was compounded with nano-fillers of carbon allotropes. As-received and modified multiwalled carbon nanotubes (MWCNTs), vapor grown carbon nanofibers (CNF) and expanded graphite (EG) were investigated. Functionalization of MWCNTs was performed to im…
This study focused on the synthesis and characterization of poly(ethylene glycol)-poly(D,L-lactide-co-glycolide)-poly(ethylene glycol) tri-block co-polymer (PEG-PDLLG-PEG), and its modification with type-I collagen. To this aim, a PEG-PDLLG-PEG tri-block co-polymer was synthesized in two steps by reacting poly(ethylen…
The fatigue crack propagation behavior of pure magnesium single crystals has been investigated in laboratory air at room temperature. Two types of CT specimens with different notch orientations were prepared from the magnesium single crystal made by the Bridgeman technique. Fatigue crack propagation behaviors of each…
Accurate measurement of thrust from microthrusters is a significant technical challenge. We report significantly improved performance from our microthruster thrust stand which has now demonstrated 25nN thrust resolution and can carry a fully operational microthruster and power supply with up to 15kg total mass. Thrust…
Lithotripter pulses (∼7–10 μs) initiate the growth of cavitation bubbles, which collapse hundreds of microseconds later. Since the bubble growth‐collapse cycle trails passage of the pulse, and is ∼1000 times shorter than the pulse interval at clinically relevant firing rates, it is not expected that cavitation will af…
This paper presents the chemical and mechanical wearing of high speed steel and tungsten carbide tools by some tropical woods. In the first part of the experiment, weight losses of tool materials of JIS SKH51-A, JIS SKH51-H and JIS WC-12%Co after reacting with wood extracts of coconut, oil palm, teak, red meranti and…
Abstract — Crosslinked polyethylene (XLPE) has been used for ac power cable insulation up to 500 kV for many years. There is a tendency to use XLPE for dc power cable. However, the easy formation of space charge under dc electric field within XLPE is a major concern for such an application. Therefore, a better underst…
Bending is the predominant deformation mode in Nitinol medical devices and components. Many of these applications also impose cyclic bending loading conditions. The present study of rotary bend fatigue provides insight into the behaviour of Nitinol under zero mean-strain conditions. This investigation also gives a bet…
AbstrAct Purpose: Purpose of this paper was to study the main effects of the turning in the superficial integrity of the duplex stainless steel ASTM A890-Gr6A. Design/methodology/approach: The focus of the work was the finishing operations and a complete factorial planning was used, with 2 levels and 5 factors. The te…
In the cavities of unprecedentedly functionalised, spherical, porous capsules of the type {Pentagon}12{Linker}30 identical with [{(Mo)Mo5O21(H2O)6}12{Mo2O4(ligand)}30]n- reactions with the ligands -i.e. at the internal shell surfaces - can be performed, in the present case deliberate aquation/hydration and deprotonati…
In this study, we have investigated the reaction between (3-aminoethyl)amino-propyltrimethoxysilane (AEPTS) and a precipitated silica in organic solvents. Solid-state 29Si NMR and Karl Fischer titration have been used to produce useful information on the grafted silica samples. AEPTS was chosen in order to characteris…