preparation and usage of zinc phosphate cement

... diameter of the PVDF membrane, the PVDF-PS membrane and the PVDF-SPS membrane is 0.25 µm, 0.12 µm and 0.16 µm, respectively It can be seen that the polymerization of styrene and the blending of PS and ... (DMAc) firstly, and then styrene, divinylbenzene (DVB) and benzoyl peroxide (BPO) were added to the solution and stirred with water bath at 343 K The dosage of PVDF, styrene, DVB and BPO was that ... immersed in deionized water for 48 h, and then the sulfonated copolymer washed with deionized water and dried for usage The sulfonated copolymer with weight of 15 g and 2.5 g polyvinyl pyrrolidine...

Ngày tải lên: 05/09/2013, 16:11

... range of 227-247 o C and the ratio of the height of the main peak to that of the other small peaks is rather great In order to obtain high sensitive LiF:Mg,Cu,Na,Si TL powder, the optimum preparation ... as a single dopant and its concentration was calculated as total of Na and Si because the compound Na2 SiO3.9H2 O was added) The X-ray diffraction (XRD) patterns of four kinds of the above mentioned ... appears at 247 o C and the other small peaks are at 150, 205, and 280 o C Comparing the glow curves shown in Fig 2, one can note that the ratio of the height of the main peak to that of the other small...

Ngày tải lên: 13/02/2014, 04:20

... Shi, Preparation, electronic structure and photocatalytic activity of the In2TiO5, Materials Science and Engineering: B Vol 139 (1) (2007) 74 J.H Kim, S.H Kim, et al., Fabrication of nanoporous and ... resistance (RD) and the light resistance (RL) under the irradiation of 7W Hg lamp at the distance of 10cm were measured The calculated ratio of RD/RL was considered as a photoconductivity of obtained ... The results of measurements show that all values RL, RD, and RD/RL strongly depend on the temperature and time of annealing as presented in Fig P.V Nho, T.K Cuong / VNU Journal of Science, Mathematics...

Ngày tải lên: 13/02/2014, 04:20

Ngày tải lên: 14/03/2014, 13:20

... temperatures of 1100 and 1200 °C The composition analysis of the products was achieved using EDS Fig 2(d) shows EDS spectrum of the nanowires, indicating that the products only consist of silicon and ... magnification SEM image of nanowire tops, (d) EDS of the nanowires X.J Wang et al / Materials Letters 63 (2009) 1149–1152 1151 Fig TEM and HRTEM images of SiOx nanowires intensities of Fe3O4 nanoparticles ... uniformly covered on the surface of Si(111) substrate, as illustrated in Fig 2(a) and (b) The lengths of these nanowires are in the range of several tens to hundreds of micrometers Fig 2(c) shows...

Ngày tải lên: 16/03/2014, 15:11

... area of CNTs was also the basis for formation of the composites Though the density of TiO2 is larger than that of CNTs, the TiO2 – CNTs composites could form a homogeneous dispersion in ethanol and ... accelerating voltage of 20 kV The samples were ultrasonicated in ethanol for and then a drop of dispersion was deposited on a Cu/Rh grid covered with formvar, a vinyl polymer, and the grid was dried ... spectrum of purified CNTs oxygenated groups which were beneficial to its combination with TiO2 then From the above results, the total area of the C 1s peak region of the MWNTs sample consists of 68.37%...

Ngày tải lên: 20/03/2014, 13:06

... 2977 Fig Schematic representation of the growth diagram of nanosheet and nanorods/nanoparticles TiO2 surface area and pore volume of the sample are about 642 m2/g and 0.774 cm3/g, respectively The ... images of the nanosheet TiO2 calcined at 600 and 700 °C showed almost nanoparticles with a mixture of anatase and rutile TiO2 structure (about 10–50 nm in diameter, at 600 °C, Fig 6(g–h)), and rutile ... the use of TEM apparatus and to Prof T Yoko, Institute for Chemical Research, Kyoto University for the use of XRD equipment This work was supported by grant-inaids from the Ministry of Education,...

Ngày tải lên: 20/03/2014, 13:06

... 70 and 140 K (inset of Fig 3): Fig Linear correlation of WNVV/TiLMM AES ratio and W4f intensity with amount of deposited WO3, the latter is plotted in units of WO3 nmÀ2 based QCM measurement of ... lengths and angles) of O, W and Ti are expected but, not surprisingly, are too small to be detectable as shifts of W4f and Ti2p core level BEs and cannot be resolved in STM images The appearance of ... Department of Energy, Of ce of Basic Energy Sciences, Chemical Sciences Division under grant DE-FG02-03ER15480 to the University of Texas and the Center for Materials Chemistry at the University of Texas...

Ngày tải lên: 20/03/2014, 13:06

... spectra of samples S2 (a) and S3 (b) can be exclusively indexed to ␣-Fe2 O3 , according to standard data (JCPDS 33-0664) In Fig 1(b) and (c), the reflection peaks of XRD patterns of S2 and S3, ... in sample S3 (e and f) B Lv et al / Particuology (2008) 334–339 and outer and inner diameters of 70–120 nm and 45–80 nm, respectively Fig 3(c) and (d) show the morphologies of Fe3 O4 nanotubes ... López-Urías, and Mu˜ oz-Sandoval (2005) n simulated the micromagnetic property of iron nanorings, and they found large coercive fields for din /dout > 0.5 (din and dout are the inner and outer diameters of...

Ngày tải lên: 20/03/2014, 13:06

... in the evolution of bacteria and moulds, and then very early recruited in the metazoans Here we report the expression and purification of recombinant geodin and its thermodynamic and spectroscopic ... IB preparation; lane 4, geodin purified from the S preparation 1024 Fig Gel filtration on Superdex G-75 of the proteins from the S preparation (A) and the IB preparation (B) from the lysate of ... of thermodynamic stability, are of about 80 kJÆmol)1 for human-cS and spherulin 3a, and of 41 and 45 kJÆmol)1 for geodin and protein S, respectively The value of 45 kJÆmol)1 for protein S is...

Ngày tải lên: 30/03/2014, 15:20

... relatively higher levels of income and education would pay more attention to various kinds of label information Assessing Consumer Awareness and Usage of Food Labels and Influences on Food Buying ... 1997 Food and Nutrition Information: A Study of Sources, Uses, and Understanding British Food Journal, 99(2): 42-44 Bender M.M., and Derby B.M., 1992 Prevalence of reading nutrition and ingredient ... Awareness and Usage of Food Labels and Influences on Food Buying Behavior Abstract Food regulations and increased consumer awareness are forcing food companies across the world to display more and...

Ngày tải lên: 08/04/2014, 16:55

... relates to consumer awareness and usage of nutrition information in Botswana The study is descriptive and seeks to provide further insights into consumer awareness and usage of nutrition information ... review and hypotheses We then present the methodology and the findings Discussions of key findings, conclusions and managerial implications follow Finally, we present limitations of the study and ... health officials of the connection between nutrition and good health it is surprising that most studies report relatively low usage of nutritional information on food products In a study of French...

Ngày tải lên: 08/04/2014, 16:55

... requiring  a knowledge of the preparation and serving of special food items i CONTENTS LESSON CREDIT HOURS TITLE PAGE Buffet Service 2 Preparation and Serving of Appetizers and Pastry 33                Examination                                        1 ... ASSIGNMENT SUBJECT Preparation and Serving of Appetizers and Pastry STUDY ASSIGNMENT Lesson Text SCOPE Purpose of appetizers; selecting, preparing, and serving hot and cold canapes and hors d'oeuvres; selecting and ... Planning sit­down and finger­type buffets; menu planning; table arrangement; arrangement and replenishment of food; arrangement of beverages, utensils, and decorations; selection, construction, and display of centerpieces...

Ngày tải lên: 03/05/2014, 12:14

... CTAB;[16] and 0.5 mL of the resulting Fe3 O4 /CTAB aqueous solution were diluted with 10 mL of water Then 0.3 mL of NH4 OH aqueous solution, 0.03 mL of tetraethylorthosilicate (TEOS), and 0.5 mL of ... 3.6 g of iron-oleate, 1.91 mL of oleylamine and 0.64 mL of oleic acid were mixed together and were heated at 120∘C for one hour After that, the dark solution was quickly heated up to 200∘C and ... previously published literature Briefly, 127 mg of tellurium powder was reacted with 80 mg of sodium borohydride (NaBH4 ) in mL of deionized water for preparation of sodium hydrogen telluride (NaHTe) solution...

Ngày tải lên: 14/05/2014, 15:49

... measurements and the analysis of the spectra and carried out the analysis of the water contact angles on nanoporous alumina AK and CE participated in the design of the study and coordination of the ... of HMDS Page of with the alumina surface occurs by the dissociative chemisorption of HMDS via reaction of coordinatively unsaturated Al + and O-sites Subsequent reaction of pendant -O-SiMe3 and ... of the prepared alumina nanoporous and thin film surfaces Chemical modification of alumina surfaces Surface modification of alumina by HMDS was carried out to render the prepared nanoporous and...

Ngày tải lên: 21/06/2014, 01:20

... vibrations of NH4+ As shown in Figure 2b, the bands of C-H and OCH2 are also observed in the surface-modified Cu nanoparticles, while the absorption peaks of P = S and P-S shifts, and the bands of N-H ... r and ν are the density and kinematic viscosity of the nanofluid, respectively, at the same temperature Measurements of the thermal conductivities of Cu nanofluids were performed by means of ... viscosity, thermal conductivity, and thermal oxidation stability of the nanofluids are also investigated Experimental Materials and preparation of ligand All the materials and solvents used in this...

Ngày tải lên: 21/06/2014, 03:20

... HS15/propofol of 10/1/5 by weight, average micelle size of about 101 nm and PDI of 0.12 as shown in Figure The LC of mixed micelles was about 32.4%, and the content of propofol in the preparation ... for propofol, which exhibits rapid sleep and recovery Page of 0.5 of dose administration) following administration of both of propofol formulations (data not shown) The results of recovery of righting ... between octadecyl and propofol was stronger than that between PLA and propofol, or the compatibility between the core of mixed micelles and propofol molecules (the difference of partial solubility...

Ngày tải lên: 21/06/2014, 04:20

... disadvantage of the one-step method Page of 11 is that preparation conditions influence the size, shape and concentration of nanoparticles, the range of particle size distribution is broad, and an ... / water nanofluid, and applied the same method to prepare Au, Ag, SiC, and carbon nanotube nanofluid In general, two-step syntheses are more suitable for the preparation of oxide nanofluids, but ... addition of a surfactant or dispersant, to disrupt agglomeration and provide dispersion and stabilize the suspension The advantages of two-step syntheses are facile and rapid preparation of large...

Ngày tải lên: 21/06/2014, 04:20

... the arrangement of cations produces pairs of Figure Magnetic hysteresis loops of a-Fe2O3 NPs (curve 1) and Fe3O4 NPs (curve 2) (a); photographs of a-Fe2O3 NPs and Fe3O4 NPs before and after magnetic ... thus  = M , and M = As · S, where r is the V density of the sample; M, S and V are the mass, surface area and volume of one Fe3O4 particle, respectively; As is the BET surface area of the sample ... transformation of NPs from a-Fe O to Fe O Moreover, the detection of the phosphate reveals that the phosphate possibly plays an important role in the formation of the spindle and porous structures...

Ngày tải lên: 21/06/2014, 06:20

... [28] A mixture of 5.406 g of FeCl3Á6H2O and 2.780 g of FeCl2Á4H2O dissolved in 100 mL of highpurity water was placed in a 250-mL flask, following by the quick droplet-addition of 15 mL of 25% NH4OH ... maximum (FWHM) of the diffraction line, and h was the diffraction angle Based on the FWHM of (3 1) Fe3O4 and (111) zinc blende reflection, the averaged crystallite sizes of Fe3O4 and Mn2±:ZnS/ZnS ... spectra of the MPQDs The Effect of the Amount of NH4OH Figure showed the effect of the amount of NH4OH on the photoluminescence spectra of the MPQDs It was found 123 Figure showed the plots of the...

Ngày tải lên: 21/06/2014, 20:20