Spatially controlled silica coating in poly(dimethylsiloxane) microchannels with the sol-gel process

2016 ◽  
Vol 232 ◽  
pp. 428-433 ◽  
Author(s):  
Jinhee Park ◽  
Kyoung Ho Jo ◽  
Hyo Yul Park ◽  
Jong Hoon Hahn
Keyword(s):  
Sol Gel ◽  
Silica Coating ◽  
Sol Gel Process

scholarly journals The effect of silica-coating by sol-gel process on resin-zirconia bonding

2013 ◽  
Vol 32 (1) ◽  
pp. 165-172 ◽  
Author(s):  
Christie Ying Kei LUNG ◽  
Edwin KUKK ◽  
Jukka Pekka MATINLINNA
Keyword(s):  
Sol Gel ◽  
Silica Coating ◽  
Sol Gel Process

Preparation and Characterization of Silica-Coated ZnSe Nanowires with Thermal Stability and Photoluminescence

2007 ◽  
Vol 7 (12) ◽  
pp. 4494-4500 ◽  
Author(s):  
Shenglin Xiong ◽  
Baojuan Xi ◽  
Weizhi Wang ◽  
Hongyang Zhou ◽  
Shuyuan Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Volume Ratio ◽  
Silica Coating ◽  
Sol Gel Process ◽  
High Resolution Tem ◽  
Potential Applications ◽  
Znse Nanowires

Silica-coated ZnSe nanowires with well-controlled the thickness of sheath in the range of 10–60 nm have been synthesized through a simple sol–gel process. The thickness of silica coating could be controlled through altering reaction parameters such as volume ratio of TEOS and ammonia. XRD, high-resolution TEM, X-ray photoelectron spectroscopy (XPS), Raman spectra, thermogravimetric analysis (TGA), and photoluminescence (PL) spectra were used to characterize the core/sheath nanostructures. Room-temperature PL measurements indicate these silica-coated ZnSe nanowires remarkably improve the PL intensity. Meanwhile, the thermal stability has been enhanced greatly, which is useful for their potential applications in advanced semiconductor devices.

Sol-Gel Process Derived Superhydrophobic Silica Thin Films for Antistiction of MEMS Devices

2007 ◽  
Vol 990 ◽  
Author(s):  
ChingPing Wong ◽  
Lingbo Zhu ◽  
Dennis W Hess ◽  
C. P. Wong
Keyword(s):  
Thin Films ◽  
High Speed ◽  
Sol Gel ◽  
Silica Coating ◽  
Interaction Force ◽  
Mems Devices ◽  
Ambient Conditions ◽  
Eutectic Liquid ◽  
Silica Thin Films ◽  
Sol Gel Process

ABSTRACTBased on the theory of superhydrophobicity for low surface energy coatings, we describe a superhydrophobic antistiction silica coating for MEMS devices. The process uses a novel sol-gel process sequence with a eutectic liquid as a templating agent. The eutectic liquid displays negligible vapor pressure and very low melting point (12°C at ambient conditions) to reduce solvent loss during the high speed spincoating process. After a fluoroalkyl silane treatment, superhydrophobicity is achieved on the as-prepared silica thin film. The solvent can be extracted after the gelation and aging processes. Spin speed effect, eutectic liquid:TEOS ratio in the solution were studied in order to optimize the surface roughness to ensure excellent super-hydrophobicity. Comparison of the silica thin films with silicon pillar surfaces showed that superhydrophobicity for the traditional sol-gel derived silica films demonstrated significant improvement, especially under humid conditions. The AFM force curve obtained with a tipless probe showed that the interaction force is greatly reduced on a rough silica superhydrophobic surface. This result offers great potential to reduce stiction failures in MEMS devices.

Silica-coating of quantum nanorods by a sol–gel process and their photo-bleaching properties

2018 ◽  
Vol 86 (3) ◽  
pp. 773-781 ◽  
Author(s):  
Mai Yokokawa ◽  
Ting-ting Li ◽  
Masaya Kambayashi ◽  
Kouichi Nakashima ◽  
Yuki Hirayama ◽  
...  
Keyword(s):  
Sol Gel ◽  
Silica Coating ◽  
Sol Gel Process

scholarly journals Facile Method for Preparation of Silica Coated Monodisperse Superparamagnetic Microspheres

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Xuan-Hung Pham ◽  
San Kyeong ◽  
Jaein Jang ◽  
Hyung-Mo Kim ◽  
Jaehi Kim ◽  
...  
Keyword(s):  
Magnetic Beads ◽  
Solid Phase ◽  
Sol Gel ◽  
Silica Coating ◽  
Alkaline Condition ◽  
Dna Separation ◽  
Surface Form ◽  
Seeded Emulsion Polymerization ◽  
Sol Gel Process ◽  
Ft Ir

This paper presents a facile method for preparation of silica coated monodisperse superparamagnetic microsphere. Herein, monodisperse porous polystyrene-divinylbenzene microbeads were prepared by seeded emulsion polymerization and subsequently sulfonated with acetic acid/H2SO4. The as-prepared sulfonated macroporous beads were magnetized in presence of Fe2+/Fe3+under alkaline condition and were subjected to silica coating by sol-gel process, providing water compatibility, easily modifiable surface form, and chemical stability. FE-SEM, TEM, FT-IR, and TGA were employed to characterize the silica coated monodisperse magnetic beads (~7.5 μm). The proposed monodisperse magnetic beads can be used as mobile solid phase particles candidate for protein and DNA separation.

scholarly journals The Synthesis of a Superhydrophobic and Thermal Stable Silica Coating via Sol-Gel Process

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 627 ◽  
Author(s):  
Karmele Vidal ◽  
Estíbaliz Gómez ◽  
Amaia Martínez Goitandia ◽  
Adrián Angulo-Ibáñez ◽  
Estíbaliz Aranzabe
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sol Gel ◽  
Hydrophobic Surface ◽  
Silica Coating ◽  
Water Contact ◽  
Silica Coatings ◽  
Sol Gel Process ◽  
Average Water ◽  
Infrared Spectrometer

A super-hydrophobic surface at a high temperature (400 °C) using the sol-gel method with tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES) as precursors has been obtained. The effects of the coatings’ ages, deposited times and thicknesses on the hydrophobicity of the silica coatings have been analysed. The morphology, chemical composition, thermal degradation and hydrophobicity of the resulting surfaces have been studied by scanning electron microscopy (SEM), Fourier transfer infrared spectrometer (FT-IR), Thermogravimetry (TGA) and water contact angle (WCA) measurement. The results show that an average water contact angle of 149° after been cured at 400 °C for a coating aged for 5 days, and four deposition cycles using a dipping rate of 1000 mm/min was achieved.

The crystallization of thin-film ceramics

1992 ◽  
Vol 50 (1) ◽  
pp. 338-339
Author(s):  
J.M. Schwartz ◽  
L.F. Francis ◽  
L.D. Schmidt ◽  
P.S. Schabes-Retchkiman
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Sol Gel ◽  
Processing Route ◽  
Small Areas ◽  
Ceramic Thin Films ◽  
Complex Shapes ◽  
Sol Gel Process ◽  
Ceramic Precursors ◽  
Crystalline Ceramic

Ceramic thin films and coatings are of interest for electrical, optical, magnetic and thermal barrier applications. Critical for improved properties in thin films is the development of specific microstructures during processing. To this end, the sol-gel method is advantageous as a versatile processing route. The sol-gel process involves depositing a solution containing metalorganic or colloidal ceramic precursors onto a substrate and heating the deposited layer to form a crystalline or non-crystalline ceramic coating. This route has several advantages, including the ability to create tailored microstructures and properties, to coat large or small areas, simple or complex shapes, and to more easily prepare multicomponent ceramics. Sol-gel derived coatings are amorphous in the as-deposited state and develop their crystalline structure and microstructure during heat-treatment. We are particularly interested in studying the amorphous to crystalline transformation, because many key features of the microstructure such as grain size and grain size distribution may be linked to this transformation.

Epitaxial Growth of Sr0.3Ba0.7Nb2O6 Thin Films Prepared by Sol-Gel Process

1999 ◽  
Vol 606 ◽  
Author(s):  
Keishi Nishio ◽  
Jirawat Thongrueng ◽  
Yuichi Watanabe ◽  
Toshio Tsuchiya
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Epitaxial Growth ◽  
Raw Materials ◽  
Substrate Surface ◽  
Sol Gel ◽  
Tungsten Bronze ◽  
Monomethyl Ether ◽  
Tetragonal Tungsten Bronze ◽  
Sol Gel Process

AbstructWe succeeded in the preparation of strontium-barium niobate (Sr0.3Ba0.7Nb2O6 : SBN30)that have a tetragonal tungsten bronze type structure thin films on SrTiO3 (100), STO, or La doped SrTiO3 (100), LSTO, single crystal substrates by a spin coating process. LSTO substrate can be used for electrode. A homogeneous coating solution was prepared with Sr and Ba acetates and Nb(OEt)5 as raw materials, and acetic acid and diethylene glycol monomethyl ether as solvents. The coating thin films were sintered at temperature from 700 to 1000°C for 10 min in air. It was confirmed that the thin films on STO substrate sintered above 700°C were in the epitaxial growth because the 16 diffraction spots were observed on the pole figure using (121) reflection. The <130> and <310> direction of the thin film on STO were oriented with the c-axis in parallel to the substrate surface. However, the diffraction spots of thin film on LSTO substrate sintered at 700°C were corresponds to the expected pattern for (110).

UV Curable Organic-Inorganic Hybrid Materials

2000 ◽  
Vol 628 ◽  
Author(s):  
Guang-Way Jang ◽  
Ren-Jye Wu ◽  
Yuung-Ching Sheen ◽  
Ya-Hui Lin ◽  
Chi-Jung Chang
Keyword(s):  
Hybrid Materials ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Solution Ph ◽  
Uv Curable ◽  
Inorganic Hybrid ◽  
Degradation Temperature ◽  
Sol Gel Process ◽  
The Stability ◽  
Thermal Degradation Temperature

This work successfully prepared an UV curable organic-inorganic hybrid material consisting of organic modified colloidal silica. Applications of UV curable organic-inorganic hybrid materials include abrasion resistant coatings, photo-patternable thin films and waveguides. Colloidal silica containing reactive functional groups were also prepared by reacting organic silane and tetraethyl orthosilicate (TEOS) using sol-gel process. In addition, the efficiency of grafting organic moiety onto silica nanoparticles was investigated by applying TGA and FTIR techniques. Experimental results indicated a strong interdependence between surface modification efficiency and solution pH. Acrylate-SiO2 hybrid formation could result in a shifting of thermal degradation temperature of organic component from about 200°C to near 400°C. In addition, the stability of organic modified colloidal silica in UV curable formula and the physical properties of resulting coatings were discussed. Furthermore, the morphology of organic modified colloidal silica was investigated by performing TEM and SEM studies‥

Halogenation of ORMOSIL: A Promising Rout for Tailoring Optical Absorptions

2003 ◽  
Vol 771 ◽  
Author(s):  
Amir Fardad ◽  
Wei Liang ◽  
Yadong Zhang ◽  
Bryson Case ◽  
Shibin Jiang ◽  
...  
Keyword(s):  
Process Parameters ◽  
Sol Gel ◽  
Fiber Amplifiers ◽  
Grignard Reaction ◽  
Coupling Loss ◽  
Beam Splitters ◽  
Silicon Technology ◽  
Sol Gel Process ◽  
Propagation Losses ◽  
Signal Intensities

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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