sol gel synthesis and processing∗
Báo cáo " Sol-gel synthesis and particle size characterization of CdSe Quantum dots " ppt
... long time 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 ... 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 ... spectrophotometer Result and discussion To calculate the particle size of QDs we use some following models: + Using absorption spectra to estimate the mean sizes of QDs: The Effros, Brus and Kayanuma’s...
Ngày tải lên: 14/03/2014, 13:20
sol–gel synthesis and morphological control of nanocrystalline tio2 via urea treatment
... 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 ... 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 ... the traditional (or typical) sol gel process in which only amorphous phase can be obtained from the precipitates derived by sol gel process before calcinations; and further higher temperature...
Ngày tải lên: 20/03/2014, 13:07
Synthesis of Nano Sized Hydroxyapatite Powder Using Sol gel Technique and Its Conversion to Dense and Porous Bodies
... sol- gel HA and commercial HA powders Type of HA powder Flexural strength (MPa) Apparent density (g/cm3) Rel density (%) Sol gel Commercial Fig — FTIR spectra of (a) dried gel HA and (b) sol- gel ... 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 showed flexural strength of 57.7 MPa and an apparent ... 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
wo3 thin film sensor prepared by sol–gel technique and its low-temperature sensing properties to trimethylamine
... 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 ... 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...
Ngày tải lên: 20/03/2014, 13:12
sol-gel science the physics and chemistry of sol-gel processing
Ngày tải lên: 01/04/2014, 10:40
comparison of single and binary oxide moo3, tio2 and wo3 sol – gel gas sensors
... 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
synthesis of wo3tio2 nanocomposites via sol–gel method
... ◦ C for (a) h, (b) h and (c) 12 h, respectively As shown in Fig 3, the WO3 /TiO2 nanocomposites prepared by the sol gel method was observed to have the anatase structure and tungsten oxide, showing ... parameters (a and c) of pure TiO2 and WO3 /TiO2 nanocomposites after calcination were calculated using the formula: h2 + k2 l2 = + d2 a2 c (1) where d is the interplane spacing, h, k and l are all ... of pure anatase TiO2 obtained by the sol gel method ˚ ˚ are a = b = 3.7523 A, c = 10.0664 A It is clear that the lattice parameters increase along the a- and b-axes while the c-axis parameter...
Ngày tải lên: 20/03/2014, 13:08
Báo cáo khoa học: Spectroscopic characterization of the oxyferrous complex of prostacyclin synthase in solution and in trapped sol–gel matrix doc
... 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
SOL-GEL TECHNOLOGY FOR THIN FILMS, FIBERS, PREFORMS, ELECTRONICS, AND SPECIALTY SHAPES potx
... 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 ... equivalence processing and conventionally melted be seen that a resolution differences However, between no definite of gel glasses prepared glasses behas gel and concluby low 30 Sol- Gel Technology METASTABLE...
Ngày tải lên: 30/03/2014, 12:20
syndiotactic polystyrene synthesis characterization processing and applications
... the start-up and operation of the first commercial SPS plant worldwide, and later on worked on polypropylene and expandable polystyrene R&D too Jürgen holds more than 70 patents and has published ... unsaturated impurities and oxidation impurities (oxides, aldehydes, and ketones) that can form in the manufacture and storage of styrene monomer and can have a detrimental effect on the soluble coordination ... particles and interparticle collisions and does not require additional seeding once the reaction is under way In the years between 1993 and 1995, Idemitsu and Dow process engineers and chemists...
Ngày tải lên: 02/04/2014, 16:30
sol–gel assisted hydrothermal synthesis of zno microstructure
... Results and discussion ZnO samples were synthesized by two main procedures: (1) sol gel process, 3.756 g Zn(NO3)2Á6H2O and 5.250 g citric acid (C6H8O7) were dissolved in 100 mL distilled water and ... of the sol gel process, the ZnO product (ZnO-s) had no specific morphology It is supposed that Zn(II) citric acid chelate complexes are formed during the gelation of sol [20], and then the gel was ... Journal of Alloys and Compounds 499 (2010) 231–237 [24] W Peng, S Qu, G Cong, Z Wang, Synthesis and structures of morphologycontrolled ZnO nano- and microcrystals, Crystal Growth and Design (6)...
Ngày tải lên: 06/05/2014, 13:26
Báo cáo hóa học: " Pipeline synthesis and optimization of FPGAbased video processing applications with CAL" pot
... color and node with light color is not valid Pipeline synthesis and optimization methodology and algorithms This section presents methodology and key algorithms for our pipeline synthesis and optimization ... of operators and the ConflictRelation to generate an ASAP (and ALAP) scheduling that gives the earliest (and latest) stage that each operator can be scheduled Tables and show ASAP and ALAP scheduling ... background and related study on pipeline synthesis and optimizations Section presents the basics of dataflow modeling in CAL Following this, in Sections and 5, we present our approach to pipeline synthesis...
Ngày tải lên: 20/06/2014, 22:20
Báo cáo hóa học: " Sol–Gel and Thermally Evaporated Nanostructured Thin ZnO Films for Photocatalytic Degradation of " doc
... 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
Báo cáo hóa học: " Morphologies of Sol–Gel Derived Thin Films of ZnO Using Different Precursor Materials and their Nanostructures Harish Bahadur Æ A. K. Srivastava Æ R. K. Sharma Æ Sudhir Chandra" pdf
... 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
ADVANCES IN CERAMICS SYNTHESIS AND CHARACTERIZATION, PROCESSING AND SPECIFIC APPLICATIONS_2 pdf
... (P-treated) and treated with Al(H2PO4)3 at 60ºC (AlN-60ºC) Normally, AlN powder exhibits a large transmittance band at 400–1000 cm-1 and two small transmittance bands at 1300–1350 cm-1 and 1400–1450 ... 2-wt.% CaF2 and 4.5-wt.% organic binders) and C (4-wt.% YF3 + 3-wt.% CaF2 and 4.5-wt.% organic binders) sintered at 1750ºC for 2h after de-waxing in Air 228 Advances in Ceramics - Synthesis and Characterization, ... moulds and cutting tools They are relatively fast and reliable techniques capable of building truly 3-D structures with a high aspect ratio and accuracy 244 • • Advances in Ceramics - Synthesis and...
Ngày tải lên: 29/06/2014, 13:20
ADVANCES IN CERAMICS SYNTHESIS AND CHARACTERIZATION, PROCESSING AND SPECIFIC APPLICATIONS_1 ppsx
... pyknometer, and Pres is the residual porosity Table Phase composition and physical and mechanical properties of the synthesis products in the Ti–Cr–Al–C system 12 Advances in Ceramics - Synthesis and ... the current and initial weights of the sample, K and n are the constant coefficients, and τ is the holding time 16 Advances in Ceramics - Synthesis and Characterization, Processing and Specific ... the titanium–tantalum solid solution with content up to 6.5% Ti are found near the combustion front This solid solution was formed due to the dissolution of Ta in the Ti melt and contains almost...
Ngày tải lên: 29/06/2014, 13:20
A study of au batio3 composite films prepared by sol gel processing
... BT and Au-BT film preparation BT and Au-BT films were spin-coated on a sapphire substrate, using the sol- gel process described in Chapter The sol- gel process has undergone some modifications, and ... the interband transition (d band to the s-p conduction band) at shorter wavelengths and intraband (free electron) absorption at longer wavelengths.1, In metal nanoparticles, the intraband contribution ... film 1.2.1 Sol- gel processing of Au-BaTiO3 thin film There are only a few studies on Au-BaTiO3 (BT) composite thin film.4-5 The thin films were prepared by using sol- gel processing and magnetron...
Ngày tải lên: 26/09/2015, 10:05
Tổng hợp hoạt tính quang hóa xúc tác của nano oxit CeO2 bằng phương pháp SOL-GEL và phương pháp vi nhũ trong phản ứng oxi hóa 4-Nitrophenol trong dung dịch
... thấy mẫu tổng hợp phương pháp sol- gel (SG) có hàm lượng Ce lớn (4,21%) Như vậy, nhận thấy mẫu hỗn hợp nano oxit CeO2-TiO2 tổng hợp thành công hai phương pháp sol- gel vi nhũ Phổ hấp thụ tử ngoại ... hạt nano hai phương pháp vi nhũ phương pháp sol- gel - Phương pháp vi nhũ tạo thành xúc tác có hoạt tính quang hóa tốt xúc tác tổng hợp phương pháp sol- gel phản ứng oxi hóa pha lỏng 4-NP dung dịch ... nhận xét mẫu tổng hợp phương pháp vi nhũ có hoạt tính quang xúc tác tốt mẫu tổng hợp phương pháp sol- gel IV - KẾT LUẬN Từ kết phân tích trên, rút số kết luận sau: 585 - Đã tổng hợp thành công xúc...
Ngày tải lên: 12/03/2013, 11:40
Chế tạo và nghiên cứu tính chất cấu trúc, tính chất quang của bột ZnO chế tạo bằng phương pháp sol-gel và màng ZnO chế tạo bằng phương pháp phun tĩnh điện
... tạo phương pháp sol- gel màng ZnO chế tạo phương pháp phun tĩnh điện ” Kế thừa công nghệ chế tạo bột màng ZnO Mục đích khóa luận: Chế tạo: - Chế tạo mẫu bột ZnO phương pháp sol- gel - Chế tạo mẫu ... mẫu màng chế tạo phương pháp phun tĩnh điện từ dung dịch chế tạo phương pháp sol- gel - Mẫu bột chế tạo phương pháp sol- gel Khóa luận tốt nghiệp Bố cục luận văn: gồm 56 trang, 50 hình vẽ, chia thành ... điểm lớn pha trộn chất không đồng đều, kích thước hạt lớn cỡ µm mà [3] Phương pháp sol- gel Phương pháp sol- gel dựa pha trộn chất dạng dung dịch nên cho phép hoà trộn đồng chất cấp độ phân tử,...
Ngày tải lên: 10/04/2013, 10:52
