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121.
Modification of Parylene film-coated glass with TiO2 nanoparticles and its photocatalytic properties
Nina PerkasGalina Amirian Olga GirshevitzJerome Charmet Edith LauxGeoffroy Guibert Herbert KeppnerAharon Gedanken 《Surface & coatings technology》2011,205(10):3190-3197
A titania film was deposited on Parylene-coated glass by a one-step, ultrasound-assisted procedure. The TiO2 nanoparticles formed during the sonochemical hydrolysis of Ti(i-OPr)4 were thrown to the surface and strongly attached to the Parylene substrate. By using different solvents (water, ethanol or their mixture) and reagent concentrations, the thickness, uniformity and crystallinity of the deposited layer were regulated. PVP was used to stabilize the highly homogeneous distribution of TiO2 nanocrystals on the Parylene surface. The morphology and structure of the coated films were characterized by physical and chemical methods such as: X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), Rutherford backscattering spectrometry (RBS), and optical spectroscopy. The photocatalytic activity of the titania-modified Parylene film in the photo discoloration of methylene blue was demonstrated. The experimental results revealed a correlation between the uniformity of the nanostructured anatase titania film and its photocatalytic properties. 相似文献
122.
Abstract A solvent extraction process is described for defluorination and desulfation of filter phosphoric acids with high Al content. The solvent used contain an amine and phosphoric acid as main constituents. The acid obtained is compatible with feed-grade requirements. It can be concentrated to 56–60% P2O5 by multiple effect evaporation, decreasing steam requirements by 50%. If an acid-base couple solvent is used in this process, part of the extracted phosphate can be recovered by back-wash with water in the form of highly purified phosphoric acid low in metals, fluorine and sulfate. The remainder of the acid along with the extracted sulfate is obtained as ammonium salt. The extracted F is converted into crystaline alkali fluorosilicate. 相似文献
123.
M. V. Landau S. V. Savilov A. S. Ivanov V. V. Lunin L. Titelman Yu. Koltypin A. Gedanken 《Journal of Materials Science》2011,46(7):2162-2172
It was established that partial combustion of carbon constituting the walls of multiwall carbon nanotubes (MWCNTs) catalyzed
by previously deposited CaCO3 nanoparticles converts parallel graphene layers in a multiwall structure to aggregates formed by nano-onions with a diameter
of 5–12 nm. The areas with positive curvature of graphene layers on the external surface of air-etched MWCNTs played the role
of docking stations for nickel nanoparticles inserted by sonochemical deposition after removal of the CaCO3. The nickel nanoparticles were located exclusively at the tops of the onions. Formation of nanoscale curvature at the MWCNT
support surfaces decreased the average size of Ni nanocrystals at similar loading of 50–60 wt% from 8 to 2 nm. Partial catalytic
combustion did not change the concentration of surface carbonyl groups measured by titration, which attributes the observed
phenomena directly to the corrugation of the MWCNT surfaces. The catalytic tests revealed a significant increase of catalytic
activity of supported Ni catalyst due to corrugating of the external surface of the MWCNT support. After oxidative etching
of the MWCNTs, the rate of chloroacetophenone hydrogenation measured with a Ni–MWCNT catalyst increased by a factor of 2 without
change in selectivity yielding chlorophenylethanol as the main product. 相似文献
124.
Michal Hanovice-Ziony Nathan Gollop Serge Yan Landau Eugene David Ungar Hussein Muklada Tzach Aharon Glasser Avi Perevolotsky John Withers Walker 《Journal of chemical ecology》2010,36(7):736-743
We investigated whether Mediterranean goats use salivary tannin-binding proteins to cope with tannin-rich forages by determining
the affinity of salivary or parotid gland proteins for tannic acid or quebracho tannin. Mixed saliva, sampled from the oral
cavity, or parotid gland contents were compared to the intermediate affinity protein bovine serum albumin with a competitive
binding assay. Goats that consume tannin-rich browse (Damascus) and goats that tend to avoid tannins (Mamber) were sequentially
fed high (Pistacia lentiscus L.), low (vetch hay), or zero (wheat hay) tannin forages. Affinity of salivary proteins for tannins did not differ between
goat breeds and did not respond to presence or absence of tannins in the diet. Proteins in mixed saliva had slightly higher
affinity for tannins than those in parotid saliva, but neither source contained proteins with higher affinity for tannins
than bovine serum albumin. Similarly, 3 months of browsing in a tannin-rich environment had little effect on the affinity
of salivary proteins for tannin in adult goats of either breed. We sampled mixed saliva from young kids before they consumed
forage and after 3 months of foraging in a tannin-rich environment. Before foraging, the saliva of Mamber kids had higher
affinity for tannic acid (but not quebracho tannin) than the saliva of Damascus kids, but there was no difference after 3 months
of exposure to tannin-rich browse, and the affinity of the proteins was always similar to the affinity of bovine serum albumin.
Our results suggest there is not a major role for salivary tannin-binding proteins in goats. Different tendencies of goat
breeds to consume tannin-rich browse does not appear be related to differences in salivary tannin-binding proteins. 相似文献
125.
Electrochemically initiated polymerization on carbon fibers is an attractive process for combining fibers with a polymer matrix. An aromatic monomer, α,α′-para-xylene, was successfully polymerized on carbon fibers in a three-compartment electrolysis cell. A composite topreg with 40 volume percent of polymer was obtained. The polymer coating has a porous texture. The polymerization is rapid and efficient. Polymerization conditions and composite thermal properties are described. 相似文献
126.
Adel Penhasi Aharon Gertler Israel Baluashvili Omar Elzinaty Deborah E. Shalev 《应用聚合物科学杂志》2020,137(36):49517
Structural polymers with a high modulus of elasticity have the necessary properties for drug eluting implants which are continuously subjected to long-term loading. The range of polymers that can be used for this purpose is severely limited by the demanding requirements, such as biocompatibility, specific mechanical properties and the capability to control the release rate of incorporated drugs. A new series of blend compositions was developed for these applications, based on a combination of a high modulus thermoplastic segmented polyurethane (TSPU) (shore D hardness) and poly(L-lactide) (PLLA). The microstructures and properties of these blends were characterized by DSC, tensile tester, FTIR, SEM, WAXD, transmitted light microscopy and elastic recovery testing. The two polymers were found to be immiscible, irrespective of the weight ratio between them, but still compatible, although the compatibility was reduced in blends with equal weight ratios or thereabouts. The dispersed phase in any case spontaneously organized into microspheres embedded within the continuous phase. PLLA could recrystallize as both the dispersed and the continuous phases. The ultimate mechanical properties and the elastic load-recovery of the blends were largely dependent on the ratio between the polymers. The ability of these blends to create self-assembled microspheres and the fact that they did not require a compatibilizer or plasticizer point to the potential of these systems to be used for structural implantable drug delivery systems. 相似文献
127.
Dwairath Dhar Yuri Koltypin Aharon Gedanken Srinivasan Chandrasekaran 《Catalysis Letters》2003,86(4):197-200
Nanostructured amorphous cobalt oxide deposited inside the pores of MCM-41 using ultrasonic deposition--precipitation of cobalt tricarbonyl nitrosyl in decalin was found to be an efficient catalyst for the epoxidation of olefins under aerobic conditions. 相似文献
128.
Guangsheng Pang Xiaonong XuVladimir Markovich Sigalit AviviOleg Palchik Yuri KoltypinGad Gorodetsky Yosef YeshurunHans Peter Buchkremer Aharon Gedanken 《Materials Research Bulletin》2003,38(1):11-16
La1−xSrxMnO3 (x=0.3) (LSM) nanoparticles were prepared by a sonication-assisted coprecipitation method. The coprecipitation reaction is carried out with ultrasound radiation. Lower sintering temperatures are required for the sonication-assisted product. Fully crystallized LSM with an average particle size 24 nm is obtained after the as-prepared mixture is annealed at 900 °C for 2 h. Magnetic properties indicate that the transition temperature from the paramagnetic to ferromagnetic state of the sample is quite sharp and occurs at 366 K for samples annealed for 2 h at 900 and 1100 °C. 相似文献
129.
130.
Aharon Segev Hana Badani Yoram Kapulnik Ilan Shomer Michal Oren-Shamir Shmuel Galili 《Journal of food science》2010,75(2):S115-S119
ABSTRACT: Dry legumes are staple and potentially functional food, being a good source of polyphenols, flavonoids, and antioxidant activity. The objective of this study was to determine the total polyphenol content (TPC), total flavonoid content (TFC), and their relation with antioxidant capacity in 17 chickpea lines having colored seed coats (black, red, brown, green, rubiginous, gray, yellow, cream, or beige). The seed coat usually contains more than 95% of these compounds. In this study, both TPC and TFC varied significantly among different lines and were highly correlated to antioxidant activity. Colored seeds contained up to 13-, 11-, and 31-fold more TPC, TFC, and antioxidant activity, respectively, than cream- and beige-color seeds. Thus, colored chickpea could be a potentially functional food in addition to its traditional role of providing dietary proteins and dietary fibers. 相似文献