Showing papers on "Amorphism published in 2010"
1 Jun 2010
TL;DR: In this article, the influence of autoclave, electron beam (e-beam), gamma, ethylene oxide (EtO) and H 2 O 2 -plasma sterilization procedures as well as influence of in-vitro dynamic loading with artificial blood plasma (ABP) and cerebrospinal fluid (ASCF) and 0.9 % NaCl on chemical resistance and crystallinity of poly-para-xylylene (Parylene C) were studied by X-ray photo-electron spectroscopy (XPS) and X-
Abstract: Among materials suitable for flexible encapsulation poly-para-xylylene (Parylene C), often chosen as protective coating for biomedical devices and variety of anticorrosion applications due to its favorable chemical and biological resistance, high thermal stability, low water vapor absorption, permeability, high biocompatibility as well as excellent dielectric and mechanical properties, is one of the most promising. In spite of a wide use only few systematic studies on biological and chemical stability of Parylene C have been carried out. In this work the influence of autoclave, electron beam (e-beam), gamma, ethylene oxide (EtO) and H 2 O 2 -plasma sterilization procedures as well as influence of in-vitro dynamic loading with artificial blood plasma (ABP) and cerebrospinal fluid (ASCF) and 0.9 % NaCl on chemical resistance and crystallinity of Parylene C were studied by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The samples, treated with e-beam sterilization, show substantial changes in their chemical content comparing to the untreated state. The XPS-analysis revealed the intrusion of CH- and CN-groups into the polymer structure and formation of inorganic chlorides on the surface of Parylene C. The second effect was also present in the samples after EtO-treatment. No detectable changes in chemical content of polymer films were observed after gamma, plasma and autoclave procedures. The reduction of Cl-concentration in Parylene C, resulted from damaging of its structure, was found in all the samples loaded with fluids. Additionally, after the fluid influence, the already mentioned implantation of nitrogen and formation of inorganic chlorides have been observed. According to the XRD-results, the autoclave sterilization and fluidic treatments caused the significant ride of Parylene C crystallinity grade. Low crystallinity increase was detected after EtO and plasma procedures, while the both irradiation treatments leads to stronger marked amorphism of the studied structures.
21 citations
Patent•
22 Sep 2010
TL;DR: In this article, a distortion-resistance wind power generation cable sheath material and a cable are presented. And the cable of the cable has low-temperature resistance (-60DEG C) and distortion resistance, excellent flexibility, improves the homogenisieren property of the other materials by adding the nanoscale inorganic active materials.
Abstract: The invention discloses a distortion-resistance wind power generation cable sheath material and a cable. The cable material comprises the following components in weight parts: 100 parts of chlorinated polyethylene, 10-30 parts of amorphism copolymer, 10-20 parts of cold-resistant plasticizer, 40-80 parts of reinforcing filler, 5-15 parts of nanosacle inorganic active agent, 2.5-5 parts of cross-linking agent, 2-5 parts of cross-linking assistant agent, 1-2.5 parts of antioxidant antiager and 10-30 parts of inorganic fire retardant, wherein the amorphism copolymer is a mixture of amorphism polyolefin thermoplastic elastomer and chlorinated polyethylene elastic body; and the nanoscale inorganic active agent is nanoscale zinc oxide and magnesium oxide. The cable of the invention has low-temperature resistance (-60DEG C)and distortion resistance, excellent flexibility, improves the homogenisieren property of the other materials by adding the nanoscale inorganic active materials, improves the molecular structure, has better flexibility because of the uvio-resistance, and has the characteristics of distortion, cold, oil and corrosion resistance and the like.
12 citations
TL;DR: In this article, the properties of metal free phthalocyanine containing rings with sulfur (2,3,9,10,16,17,23,24-tetra) have been studied.
6 citations
TL;DR: The magnetic response of the arrays was measured using vibrating sample magnetometry at room temperature as discussed by the authors, and the results showed that the coercivity and squareness with the magnetic field along the nanowire arrays decrease with the increase of the Sn content.
4 citations
Journal Article•
TL;DR: In this paper, X-ray diffraction was used to confirm the phase structure of the thin films, and the atomic force microscopy (AFM) was also used to observe the surface microstructure of thin films.
Abstract: XRD, AFM and SE were used to measure and analyze optical properties of SiO_2 and HfO_2 thin films. Selimeier and Cauchy dispersion model were used to calculate the refractive index, extinction coefficient and thickness of thin films in the visible region of the spectrum between 300～800 nm. The X-ray diffraction (XRD) was used to confirm the phase structure of the thin films, and the atomic force microscopy (AFM) was used to observe the surface microstructure of the thin films. The results show that the phase structure of SiO_2 film is amorphism, the phase structure of HfO_2 film is monoclinic. The thin film optical properties was correlative with thin film microstructure. Selimeier and cauchy dispersion model could describe optical properties of SiO_2 and HfO_2 film very well and the variation rule of the optical properties with wavelength was obtained.
1 citations
1 Jan 2010
TL;DR: The structure of Maoming kaolin calcined at different temperatures was examined by XRD,IR and SEMVariations of particle size distribution and hiding capability during its calcinations were also studied as mentioned in this paper.
Abstract: The structure of Maoming kaolin calcined at different temperatures was examined by XRD,IR and SEMVariations of particle size distribution and hiding capability during its calcinations were also studiedThe results show that transformation of Maoming kaolin from crystal kaolinite to amorphism metakaolinite occurs at about 650℃The particle size and grain size d 10,d50 and d90 increases at 450～1050℃The grain size decreases at 750～850℃;The hiding power falls down at 450～550℃ and then increases with the temperature rising at 550～950℃
1 citations
Patent•
25 Mar 2010
TL;DR: In this paper, a polymer electrolyte fuel cell equipped with the membrane-electrode assembly is supplied, and the intensity ratio of a crystal peak to be measured with the wide-angle X-ray diffraction of polyethylene in a catalyst layer, to an amorphism peak is in a range of 1.09-1.19.
Abstract: PROBLEM TO BE SOLVED: To supply a polymer electrolyte fuel cell having high cell voltage in a high current density region and high maximum output density.SOLUTION: In this membrane-electrode assembly, the intensity ratio of a crystal peak to be measured with the wide-angle X-ray diffraction of polymer electrolyte in a catalyst layer, to an amorphism peak is in a range of 1.09-1.19. The polymer electrolyte fuel cell equipped with the membrane-electrode assembly is supplied.
30 Mar 2010
TL;DR: In this paper, a planetary ball mill was used for milling and heat treatment of nanostructured vanadium carbides of Ti and V. The milled and heat treated powders were characterized by SEM, EDAX, XRD, and BET techniques.
Abstract: Carbides of Ti and V have been synthesized directly from their oxides and ferroalloys through mechanical milling and heat treatment. The powder mixtures are milled in a planetary ball mill from 15–80 hours and subsequently heat treated at 1000–1300° C for TiO2‐C mixtures, at 500–550° C for V2O5‐C mixtures and at 600–1000° C for (Fe‐V)‐C mixtures. The milled and heat treated powders are characterized by SEM, EDAX, XRD, and BET techniques. Nanostructured TiC has been successfully synthesized under suitable processing conditions. However, carbides of vanadium is unidentified even though possibilities of V2O5‐C reaction are indicated with an extent of induced amorphism in the powder mixture. Density, specific surface area and particle size of the milled and heat treated mixtures are correlated with heat treatment temperatures. Similar attempts are also made to synthesize vanadium carbides from industrial grade Fe‐V.