Anion-Exchange Material with pH-Switchable Surface Charge Prepared by Sol−Gel Processing of an Organofunctional Silicon Alkoxide

2001 ◽  
Vol 13 (3) ◽  
pp. 1124-1130 ◽  
Author(s):  
Pei Tien ◽  
Lai-Kwan Chau ◽  
Yu-Yun Shieh ◽  
Wen-Cheng Lin ◽  
Guor-Tzo Wei
Keyword(s):  
Surface Charge ◽  
Anion Exchange ◽  
Sol Gel ◽  
Silicon Alkoxide ◽  
Exchange Material ◽  
Gel Processing

Amperometricl-Lactate Sensor Based on Sol−Gel Processing of an Enzyme-Linked Silicon Alkoxide

2007 ◽  
Vol 79 (10) ◽  
pp. 3757-3763 ◽  
Author(s):  
Cheng-Li Lin ◽  
Cheng-Ling Shih ◽  
Lai-Kwan Chau
Keyword(s):  
Sol Gel ◽  
Silicon Alkoxide ◽  
Lactate Sensor ◽  
Gel Processing

Fiber-Optic Evanescent-Wave Absorption Copper(II) Sensor Based on Sol-Gel-Derived Organofunctionalized Silica Cladding

2001 ◽  
Vol 55 (10) ◽  
pp. 1320-1326 ◽  
Author(s):  
Ta-Chuan Yeh ◽  
Pei Tien ◽  
Lai-Kwan Chau
Keyword(s):  
Evanescent Wave ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Sol Gel ◽  
Complexation Reaction ◽  
Silicon Alkoxide ◽  
Colored Complex ◽  
Wave Absorption ◽  
Large Formation ◽  
Gel Processing

A fiber-optic evanescent-wave absorption sensor was constructed on the basis of an organofunctionalized silica cladding. The cladding material was prepared by the sol-gel processing of an organofunctional silicon alkoxide, which contains a propyl-ethylenediamine triacetate (PEDTA) group. The PEDTA group can chelate with a Cu(II) ion to form a colored complex. Because of the large formation constant of the complexation reaction, a kinetic approach was used to quantify the Cu(II) content in samples. The sensor has a dynamic range of 0.5–100 ppm and a detection limit of 56 ppb. The measurement of the Cu(II) content in a scattering medium has also been demonstrated.

Synthesis and characterization of BaMgAl10O17:Eu phosphors derived by sol–gel processing

2002 ◽  
Vol 126 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Junying Zhang ◽  
Zhongtai Zhang ◽  
Zilong Tang ◽  
Zishan Zheng ◽  
Yuanhua Lin
Keyword(s):  
Sol Gel ◽  
Synthesis And Characterization ◽  
Gel Processing

Chemical Solution Deposition of Lanthanum Zirconate Buffer Layers on Biaxially Textured Ni–1.7% Fe–3% W Alloy Substrates for Coated-conductor Fabrication

2002 ◽  
Vol 17 (6) ◽  
pp. 1543-1549 ◽  
Author(s):  
S. Sathyamurthy ◽  
M. Paranthaman ◽  
T. Aytug ◽  
B. W. Kang ◽  
P. M. Martin ◽  
...  
Keyword(s):  
Sol Gel ◽  
Rf Sputtering ◽  
Cube Texture ◽  
Dip Coating ◽  
Buffer Layers ◽  
Lanthanum Zirconate ◽  
Solution Deposition ◽  
Ybco Films ◽  
Current Densities ◽  
Gel Processing

Sol-gel processing of La2Zr2O7 (LZO) buffer layers on biaxially textured Ni–1.7% Fe–3% W alloy substrates using a continuous reel-to-reel dip-coating unit has been studied. The epitaxial LZO films obtained have a strong cube texture and uniform microstructure. The effects of increasing the annealing speed on the texture, microstructure, and carbon content retained in the film were studied. On top of the LZO films, epitaxial layers of yttria-stabilized zirconia and Ceria (CeO2) were deposited using rf sputtering, and YBa2Cu3Ox (YBCO) films were then deposited using pulsed laser deposition. Critical current densities (Jc) of 1.9 MA/cm2 at 77 K and self-field and 0.34 MA/cm2at 77 K and 0.5 T have been obtained on these films. These values are comparable to those obtained on YBCO films deposited on all-vacuum deposited buffer layers and the highest ever obtained using solution seed layers.

Effect of acetylacetone on the preparation of PZT materials in sol–gel processing

2002 ◽  
Vol 96 (3) ◽  
pp. 307-312 ◽  
Author(s):  
Luqian Weng ◽  
Xujin Bao ◽  
Kwesi Sagoe-Crentsil
Keyword(s):  
Sol Gel ◽  
Gel Processing

Diamond Machinable Sol-Gel Silica Based Hybrid Coatings for High Precision Optical Molds

2010 ◽  
Vol 438 ◽  
pp. 65-72 ◽  
Author(s):  
Andreas Mehner ◽  
Ju An Dong ◽  
Timo Hoja ◽  
Torsten Prenzel ◽  
Yildirim Mutlugünes ◽  
...  
Keyword(s):  
Injection Molding ◽  
High Precision ◽  
Sol Gel ◽  
Processing Parameters ◽  
Hybrid Coatings ◽  
Optical Elements ◽  
Optical Components ◽  
New Approach ◽  
Free Silica ◽  
Gel Processing

The demand for high precision optical elements as micro lens arrays for displays increases continually. Economic mass production of such optical elements is done by replication with high precision optical molds. A new approach for manufacturing such molds was realized by diamond machinable and wear resistant sol-gel coatings. Crack free silica based hybrid coatings from base catalyzed sols from tetraethylorthosilicate (TEOS: Si(OC2H5)4) and methyltriethoxysilane (MTES: Si(CH3)(OC2H5)3) precursors were deposited onto pre-machined steel molds by spin coating process followed by a heat treatment at temperatures up to 800°C. Crack-free multilayer coatings with a total thickness of up to 18 µm were achieved. Micro-machining of these coatings was accomplished by high precision fly cutting with diamond tools. Molds with micro-structured coatings were successfully tested for injection molding of PMMA optical components. The wear resistance of the coatings was successfully tested by injection molding of 1000 PMMA lenses. Hardness and elastic modulus of the coatings were measured by nano indentation. The chemical composition was measured by X-ray photo electron spectroscopy (XPS) as a function of the sol-gel processing parameters.

scholarly journals Metallkomplexe in Anorganischen Matrices, 5 [1] / Metal Complexes in Inorganic Matrices, 5 [1]

1991 ◽  
Vol 46 (6) ◽  
pp. 783-788 ◽  
Author(s):  
Christian Egger ◽  
Ulrich Schubert
Keyword(s):  
Acetic Acid ◽  
Metal Complexes ◽  
Phenylacetic Acid ◽  
Sol Gel ◽  
Rhodium Complex ◽  
Gel Processing ◽  
Inorganic Matrices

A heterogenized rhodium complex, prepared by sol-gel processing of Rh(CO)Cl[PPh2CH2CH2Si(OEt)3]2 and Si(OEt)4, is shown to catalyze the conversion of the silanes H4-nSiPh„ (n = 1 - 3) or (HMe2Si)2O to (poly)siloxanes by air or water. Using THF as a solvent, the silanoles Ph3SiOH or Ph2Si(OH)2 are obtained instead. The reaction of phenylacetic acid or acetic acid with HSiPh3 to give silyl esters is catalyzed by the same compound.

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