sol gel and wet chemistry synthesis and properties

... by a thermal evaporation and b sol gel 123 630 Nanoscale Res Lett (2009) 4:627–634 Fig Surface profile scans of ZnO thin films prepared by a thermal evaporation and b sol gel Fig Photocatalytic degradation ... prepared by thermal evaporation and sol gel techniques Fig Kinetics of TCP photocatalytic degradation using ZnO thin film catalyst prepared by thermal evaporation and sol gel techniques irradiation ... a thermal evaporation and b sol gel techniques prepared using sol gel (27 m2/g), which in turn affects the catalytic activity Figure illustrates the topographical image and 2D profile of the thin...

Ngày tải lên: 22/06/2014, 00:20

... reaction and its distribution in particle size is in the broadening range In this article, we report on the preparation of CdSe quantum dots (QDs) by sol- gel method and investigate their optical properties ... affected by the Cd:Se ratio, the reaction temperature and time From TEM image on fig 1, we can see CdSe QDs are dispersed in toluen solvent and have the spherical shapes with the mean diameter ... Thi Hong Hanh, Synthesis CdSe quantumdots and determine its size from optical spectra, Advances in Optics Photonics Spectroscopy & Applications V (2008) 517 S.V.Gaponenko, Optical Properties of...

Ngày tải lên: 14/03/2014, 13:20

... temperature and high pressure in the autoclave under the hydrothermal condition, a completely different reaction mechanism and formation sequence of liquid crystal template and sol gel synthesis ... types of TiO2 rods and hollow tubes may possess potential applications due to their unusual catalytic, electric, and optical properties 3.3 Formation mechanism In sol gel synthesis using transition ... and 5d Conclusions A novel approach adopting the anionic template-assisted sol gel synthesis via urea treatment and under hydrothermal processing to synthesize the nanocrystalline TiO2 rods and...

Ngày tải lên: 20/03/2014, 13:07

... 4f5/2 and W 4f7/2 are found to lie at 37.1 and 35.20 eV, respectively and are contributed to lattice tungsten in the WO3 crystal 3.2 Gas sensing properties of the thin film sensors Results and discussion ... 50–85◦ C, but not sensitive to NH3 , gasoline, C2 H5 OH, CH4 and CO and water vapor These results indicate that the WO3 thin film sensor prepared by a sol gel Fig X-ray photoelectron spectra of ... The relationship between the gas sensitivity and TMA concentration at 70◦ C NH3 , gasoline, C2 H5 OH, CH4 and CO at the same concentration of 1000 ppm and to water vapor These experimental results...

Ngày tải lên: 20/03/2014, 13:12

Ngày tải lên: 01/04/2014, 10:40

... of 355.8 and 93.6 Oe, respectively, for NCs and PSC, saturation magnetizations (Ms) of 125.7 and 162.5 emu/g, respectively, for NCs and PSC, and remnant magnetization (M r ) up to 46.6, and 4.5 ... of published SY and YQ: partly carried out the TEM and HRTEM experiments, as well as drafted the manuscript XL, LS, and HL: conceived of the study, and participated in its design and coordination ... metal, which will make them as promising candidates for advanced magnetic media and investigative studies on novel great magnetoresistive properties Results and discussion Figure 1a shows a typical...

Ngày tải lên: 21/06/2014, 04:20

... Table lists the physical properties of dense samples prepared using the sol- gel HA and commercial HA powders after sintering at 1250°C The sintered dense bodies for the sol- gel derived HA powder ... — Physical properties of dense samples prepared using the sol- gel HA and commercial HA powders Type of HA powder Flexural strength (MPa) Apparent density (g/cm3) Rel density (%) Sol gel Commercial ... reported that sol- gel derived HA powders have particle size of about 100 nm in diameter8 Figure shows the IR spectra of the dried gel (a) and hydroxyapatite powder (b) The dried gel s spectrum...

Ngày tải lên: 08/04/2015, 15:09

... potential [8±10] Experimental TiO2, WO3, MoO3, MoO3±TiO2 and MoO3±WO3 were prepared by the sol gel method The precursors used to 277 Table Sol gel precursors Component Chemicals Formula Mo precursor ... sensing It is well known that both In2O3 [14] and WO3 [15] are highly sensitive to O3 Sol gel based WO3 has a response of 35±80 ppb of O3 [15] Sol gel based MoO3±WO3 was Fig Dynamic response MoO3±WO3 ... metal oxides MoO3 has to be highly oxidized and reduced By mixing it with TiO2 and WO3, the resistivity is reduced and in cases of O3, CO and NO2 gas and ethanol vapor sensing, its performance...

Ngày tải lên: 19/03/2014, 16:47

... clotrimazole to PGIS in solution and in sol gel 360 400 440 480 Wavelength (nm) 0.3 1.0 0.2 0.5 0.1 0.0 0.1 Abs UV ⁄ VIS spectra of ligand binding of PGIS in solution and in sol gel monolith 360 400 ... Absorption spectra of PGIS and its ligand complexes in solution and in sol gel Binding with (A) U46619, (B) NaCN and (C) clotrimazole Spectra were recorded before (solid lines) and after (dashed lines) ... in solution and in sol gel (A) Absorption spectra of PGIS (solid line) and its oxyferrous complex formed at 1.5 h (dotted line), 2.5 h (dashed line) and h (dot– dot–dash line) in the sol gel...

Ngày tải lên: 23/03/2014, 07:20

... Introduction and Highlights of the Sol- Gel Process Principles of the Sol- Gel Dip Process Process Technology Process Advantages Other Coating Techniques Chemistry and Physical ... Mobility and Conductivity Lithium Salt Containing ORMOSI LS Gels Sol- Gel Routes Leading to Ceramics and Thick Films Pure Phase Powders and Ceramics Low Temperature Sintering and Fine ... uniformly dispersed and subsequent gelation should then freeze all elements in a gel network The first sol- gel preparations carried out by the Rays” used silicon tetraethoxide and solutions of the...

Ngày tải lên: 30/03/2014, 12:20

... nanostructures Issues of synthesis methods, structural, electrical, optical, magnetic and gas sensing properties are summarized Synthesis of ZnO Nanostructures 2.1 Vapor Transport Synthesis The most ... nanowire array was oxidized at 300 °C for hours and ZnO nanowire array was obtained In a sol- gel synthesis method,86 AAM was also used as the template and immersed into a suspension containing zinc ... nanostructure, and also employ less rigorous synthesis conditions and provide great potential for device applications Physical Properties of ZnO Nanostructures Table lists the basic physical properties...

Ngày tải lên: 28/04/2014, 15:06

... 0,1,2 and 3; the materials of interest include metals, amorphous and crystalline alloys, semiconductors, oxides, nitride and carbide ceramics in the form of clusters, thin films, multilayers, and ... compounds that surely will be used in future technologies and applications Before the first synthesis and detection of the smaller fullerenes C60 and C70, it was generally accepted that these large ... Thomas, 199 7and Saito et al., 1993]: Ch = n*a1 +m*a2 (1.1) The so-called chiral vector of the nanotube, Ch, where a1 and a2 are unit vectors in the two-dimensional hexagonal lattice, and n and m are...

Ngày tải lên: 28/05/2014, 15:03

... into the melts and maintained there for 24 h The crucible was then taken out and led cool naturally down to room-temperature The solid product was dissolved in deionized water and then filtered ... large number of –O–Pb–O– linkages [22] with [PbO6] octahedra and [OPb4] and [PbO4] tetrahedra form and enter [TeO4] and [TeO3] network, and forms glass phase when the system cools down, because ... plotting (Fig 4a) and shows a clear optical gap at about 3.72 and 4.12 eV It is indicated that the lead tellurite nanobelts are indirect band gap semiconductor, and the enlarged optical band gap is...

Ngày tải lên: 21/06/2014, 17:20

... 180 °C for 24 h and then allowed to cool to room temperature A yellowish precipitate was collected and washed with absolute ethanol and distilled water to remove residue of organic solvents The ... ZnS has a wider band gap (Eg = 3.7 eV) than CdS The surface modification of a wide band gap semiconducting shell around a narrow band gap core can alter the charge, functionality, and reactivity ... autoclave and maintained at 180 °C for 12 h After the reaction was completed, the autoclave was cooled to room temperature naturally, and the resulting solid products were collected, washed with absolute...

Ngày tải lên: 22/06/2014, 01:20

... atmosphere A solution of SEBS (10% w/v in DCE) was prepared in a three necked round bottom flask equipped with condenser and the solution was heated to 60 °C and stirred for h for full solubilization ... 3:36–44 Uptake content = ðwwet À wdry Þ Â 100 wdry 39 ð3Þ where wwet = weight of wet samples after blotting the surface water–MeOH and wdry = weight of dry sample before wetting Permeability of ... AFM and TEM images and DMTA) due to proper dispersion of MT nanoclays in the resulting nanocomposites AC Resistance in Dry and Wet Modes This tremendous improvement in water–MeOH uptake and permeation...

Ngày tải lên: 22/06/2014, 06:20

... are characteristics of sol or substrates The sols were prepared by using two different routes and precursor materials viz zinc nitrate and zinc acetate Accordingly, the solvent chosen were also ... two different solvents was due to the fact that the solubility of two precursor materials zinc nitrate and zinc acetate is different in their solvents While zinc nitrate was dissolved in 123 ... Hamrin, Thin Solid Films 217, 133 (1992) R Kaur, A.V Singh, R.M Mehra, Mater Sci Poland 22, 201 (2004) M.N Kamlasanan, S Chandra, Thin Solid Films 288, 112 (1996) T Saeed, P O’Brien, Thin Solid Films...

Ngày tải lên: 22/06/2014, 18:20

Ngày tải lên: 13/11/2014, 09:31

... can solubilize insoluble substrate proteins On the other hand, soluble substrate proteins can also be hydrolyzed by insoluble proteases By passing soluble protein substrates through an insoluble ... interfaces and naturally occurring protein surfactants Chapter discusses amino acid surfactants, their chemical synthesis and physicochemical properties Chapters and discuss enzymatic approaches to synthesis ... Yasuki Matsumura Amino Acid Surfactants: Chemistry, Synthesis, and Properties 75 Jiding Xia, Ifendu A Nnanna, and Kazutami Sakamoto Enzyme-Catalyzed Synthesis of Protein-Based Surfactants: Amphoteric...

Ngày tải lên: 06/05/2015, 07:49

... better control and understanding of H effect in ZnO is of great technological interest This thesis focused on hydrothermal synthesis, ferromagnetic and luminescent properties, and hydrogen effect of ... charged, singly charged, and neutral zinc vacancies, respectively Zni and Zni+ represent neutral and singly charged zinc interstitials, respectively VO and VO+ denotes neutral and singly charged oxygen ... charged, singly charged, and neutral zinc vacancies, respectively Zni and Zni+ represent neutral and singly charged zinc interstitials, respectively VO and VO+ denotes neutral and singly charged oxygen...

Ngày tải lên: 09/09/2015, 10:15

... particular C-Hπ and C-HX in solid state and their properties in solid state and their role in the design and synthesis of organic solids during his studies in the late 80’s and early 90’s showed ... monodentate 4-styrylpyridine (4spy) ligand and its derivatives The synthesis of porous CPs, solvent induced structural dynamics, gas sorption and separation properties also have been described here ... ligand Among these, the CP with 4spy ligand showed anisotropic structural transformation upon loss of coordinated and lattice solvent molecules and the final structure has been confirmed by solid...

Ngày tải lên: 09/09/2015, 11:15