Influence of sol–gel process parameters on the micro-structure and performance of hybrid silica membranes

AbstractFluorinated and photo-imageable precursors are synthesized through a Barbier-Grignard reaction for 1550-nm window. The precursors are used for the sol-gel process of integrated optic components for silica-on-silicon technology. Material compositions and process parameters are optimized to achieve internal absorptions >0.1 dB/cm and propagation losses of about 0.5 dB/cm at 1550 nm. Compact 1×16 Beam splitters are designed and fabricated which exhibit >0.3 dB power uniformity, >0.1 dB PDL and 1.5 dB coupling loss. By hybrid integration of the passive splitters and in-house fiber amplifiers, amplifying splitters are demonstrated at various signal intensities.

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Resistance to Growth of Molds for Wood Modified with Hydrophobic Hybrid Silica Gel Containing Copper Amine Complexes

Materials ◽

10.3390/ma14030577 ◽

2021 ◽

Vol 14 (3) ◽

pp. 577

Author(s):

Shaokun Hao ◽

Chuanshuang Hu ◽

Xiuyi Lin ◽

Jin Gu ◽

Hong Yun ◽

...

Keyword(s):

Silica Gel ◽

High Efficiency ◽

Copper Chloride ◽

Sol Gel ◽

Untreated Wood ◽

Populus Tomentosa ◽

Amine Complexes ◽

Hybrid Silica ◽

Sol Gel Process ◽

Copper Amine

Complexation copper with amine provides an effective strategy for fixation copper in wood, while hydrophobic modification improves the dimensional stability of wood. Thus, a combination of complexation and hydrophobization is expected to enhance the efficiency of copper-based biocides. In this study, hydrophobic hybrid silica gel containing copper amine complexes (MACu) was prepared through an in situ sol-gel process in wood using methyltriethoxysilane (MTES), 3-amino-propyltriethoxysilane (APTES), and copper chloride. The resistance to growth of molds for MACu modified wood (Populus tomentosa) was measured according to ASTM D3273-16. A leaching resistance test was carried out in accordance with AWPA E11-16. The results showed that only Aspergillus niger covered the surface of untreated wood blocks and no mold grew on the MACu surface even after the leaching test. MACu xerogel and MACu wood were further characterized by SEM-EDS, FTIR, and XPS. A possible schematic diagram of the reaction mechanism was proposed to explain the high-efficiency anti-mold performance of MACu wood.

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Interlayer-free Glucose Carbonised Template Silica Membranes for Brine Water Desalination

MATEC Web of Conferences ◽

10.1051/matecconf/201928003010 ◽

2019 ◽

Vol 280 ◽

pp. 03010 ◽

Cited By ~ 2

Author(s):

Dwi Rasy Mujiyanti ◽

Muthia Elma ◽

Mufidah Amalia

Keyword(s):

Sol Gel ◽

Tetraethyl Orthosilicate ◽

Water Desalination ◽

Molar Ratio ◽

Solution Temperature ◽

Nacl Solution ◽

Silica Membranes ◽

Salt Ions ◽

Sol Gel Process ◽

Free Glucose

Interlayer-free glucose carbonized template silica membranesbased on tetraethyl orthosilicate (TEOS) and glucose were successfullyprepared using an acid-base catalysed sol-gel method for artificial brinewater desalination (7.5% wt NaCl solution %) at temperatures range from25, 40 and 60 °C. These membranes calcined at 250 and 400 °C. Themembranes were fabricated through sol-gel process by using TEOS(tetraethyl orthosilicate); ethanol; nitric acid; ammonia; aquadest andglucose as a template. By molar ratio is 1: 38: 0.0007: 0.0003: 5 and0.25%; 0.5%, 1% w/v glucose as template. The results show the highestwater fluxes of 1.8, 2.2 and 4.8 kg m−2 h−1 for 25, 40 and 60 °Cdesalination process with excellent salt rejections of 99.5, 99.5 and 99.7%, respectively. It was found that the higher the NaCl solution temperature asfeed solution as well as glucose concentration (0.25% to 1% wt) astemplate attached in the silica matrixes, the higher water fluxes eventhough the salt rejection remain the same. This study demonstrates that theorganosilica membranes offered the carbonized silica mesostructuremembranes with excellent separation of water from the hydrated salt ions, particularly for processing brine salt solutions.

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Effect of sol-gel process parameters on the properties of a Li1.3Ti1.7Al0.3(PO4)3 solid electrolyte for Li-ion batteries

Journal of the Korean Physical Society ◽

10.3938/jkps.68.28 ◽

2016 ◽

Vol 68 (1) ◽

pp. 28-34 ◽

Cited By ~ 2

Author(s):

Seoung Soo Lee ◽

Jing Lee ◽

Yeon-Gil Jung ◽

Jae-Kwang Kim ◽

Youngsik Kim

Keyword(s):

Solid Electrolyte ◽

Process Parameters ◽

Sol Gel ◽

Li Ion Batteries ◽

Sol Gel Process ◽

Li Ion

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Studies on Preparation and Property of 2.5D SiO2f/ SiO2 Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.1767 ◽

2009 ◽

Vol 79-82 ◽

pp. 1767-1770 ◽

Cited By ~ 16

Author(s):

Shu Ang Han ◽

Kai Hui Jiang ◽

Jun Wu Tang

Keyword(s):

Dielectric Properties ◽

Flexural Strength ◽

Process Parameters ◽

Sol Gel ◽

Microwave Drying ◽

Optimal Parameters ◽

Optimal Process ◽

The Real ◽

Sol Gel Process ◽

5 Ghz

In this paper, 2.5D SiO2f/SiO2 composites were fabricated via sol-gel process employing 2.5D braided silica fiber fabrics as reinforcements and high pure silicasol as slurry. The process parameters are optimized and the optimal parameters are as follows: the silicasol of 30.8 wt. % as slurry, microwave drying, and sintering at 900 °C. Utilizing the optimal process parameters, the density and the flexural strength of the composites can reach 1.65 g•cm-3 and 80.68 MPa respectively. Dielectric properties of the 2.5D SiO2f/SiO2 composites were also measured, and the real part of the permittivity is 3.40 at 5 GHz. The excellent mechanical and dielectric properties of the 2.5D SiO2f/SiO2 composites can well meet the requirements of radome materials.

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