Methyltrimethoxysilane based monolithic silica aerogels via ambient pressure drying

Bhagat, Sharad D.; Oh, Chang-Sup; Kim, Yong-Ha; Ahn, Young-Soo; Yeo, Jeong-Gu

doi:10.1016/j.micromeso.2006.10.026

Cited by 149 publications

(107 citation statements)

References 19 publications

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“…The porous ormosil coatings were prepared using the gels of methyltrimethoxysilane (MTMS) and tetramethylorthosilicate (TMOS) monomers. 26,40 Ormosil gels were synthesized using a two step acid−base sol−gel reaction. In the first step, monomers were diluted in methanol and hydrolyzed using oxalic acid.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…To prepare ormosil coatings first ormosil gels were synthesized by modifying a previously reported method. 40 In the first step, x mL (x is between 0.4 and 1) of MTMS and 1 − x mL of TMOS were added to 9.74 mL of methanol. Then, 0.5 mL of 0.01 M aqueous oxalic acid solution was added to the solution dropwise under gentle stirring.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 1 more Smart Citation

Superhydrophobic and Omnidirectional Antireflective Surfaces from Nanostructured Ormosil Colloids

Yıldırım

Khudiyev

Daglar

et al. 2013

ACS Appl. Mater. Interfaces

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A large-area superhydrophobic and omnidirectional antireflective nanostructured organically modified silica coating has been designed and prepared. The coating mimics the self-cleaning property of superhydrophobic lotus leaves and omnidirectional broad band antireflectivity of moth compound eyes, simultaneously. Water contact and sliding angles of the coating are around 160°and 10°, respectively. Coating improves the transmittance of the glass substrate around 4%, when coated on a single side of a glass, in visible and near-infrared region at normal incidence angles. At oblique incidence angles (up to 60°) improvement in transmission reaches to around 8%. In addition, coatings are mechanically stable against impact of water droplets from considerable heights. We believe that our inexpensive and durable multifunctional coatings are suitable for stepping out of the laboratory to practical outdoor applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Superhydrophobic and Omnidirectional Antireflective Surfaces from Nanostructured Ormosil Colloids

Yıldırım

Khudiyev

Daglar

et al. 2013

ACS Appl. Mater. Interfaces

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“…23,27,29 In the first step, 1 ml of MTMS was dissolved in appropriate amounts of DMSO or methanol. For example, for the D7 gel a total of 7 ml DMSO was used.…”

Section: Gel Preparationmentioning

confidence: 99%

“…The gels are surprisingly homogeneous instead of the commonly obtained macroscopic phase separated MSQ gels when prepared in alcohols by using the same precursor. [25][26][27] This is because all structures formed during polymerization are dissolved in DMSO. Here, for the first time, we prepared uniform and nanoporous thin films by using homogeneous MSQ gels.…”

Section: Introductionmentioning

confidence: 99%

Template free preparation of nanoporous organically modified silica thin films on flexible substrates

et al. 2011

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We report the preparation and characterization of nanoporous organically modified silica (ormosil) thin films at room temperature and neutral pH conditions from homogeneous methyl silsesquioxane (MSQ) gels. Universally applicable and stable colloidal ormosil suspensions are prepared from the gels by sonication and coated to the substrates including glass, paper and plastics. The nanoporosity and thickness of the films can be tuned, which makes them suitable for certain applications including sensing, functional coatings, and low-dielectric materials. We demonstrate the antireflection property of the films on glass, cellulose acetate (CA) and polyetherimide (PEI) substrates. The films on CA and PEI retain their antireflection property after multiple bending cycles. Furthermore, films are intrinsically hydrophobic, over a wide pH range, with static contact angles up to 143 on paper and 123 on glass and CA. Producing nanoporous ormosil thin films on flexible substrates may expand their use in low cost electronic, optical devices and sensors, and lab-on-paper applications.

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“…Steam-induced phase separation could introduce a surface with a contact angle of 163°on a polystyrene-dimethylsilane copolymer (PS-b-PDMS) film 16 . Using nano-imprinting, lotus leaf-shaped, concave micro-PDMS with a contact angle 4150°could be fabricated 17 21,22 have been utilized in the sol-gel process to achieve surface hydrophobicity. Those nanoparticles can generate micrometer-sized holes on the surface after drying during the sol-gel process.…”

Section: Introductionmentioning

confidence: 99%

A designable surface via the micro-molding process

Wang

et al. 2018

Microsyst Nanoeng

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A rapid prototyping process was presented to fabricate a nylon honeycomb microstructure coated with parylene C. The surface structure was designed to obtain a hydrophobic surface using the volume of fluid (VOF) model. With the micro-molding technique, the contact angle of the polymer surface could be designed and fabricated by changing the different microstructure surface diesteel mold inserts. For the honeycomb (20 μm width and 60 μm depth) microcavity side wall, an average micro-molding filling percentage of 95% could be achieved by using a three-section constant-pressure molding process. The solid surface wettability is governed by both the geometrical microstructures and the surface energy. A 2 μm parylene C layer was deposited on the nylon honeycomb microsurface to reduce the surface energy. To design honeycomb structures with different microcavity densities, the contact angle of these artificial surfaces could change from 91°to 130°. From a comparison of the contact angle measurements with the different models, the honeycomb-structured microsurface could be described by the Cassie-Baxter model. The errors between the VOF simulation and the measured data were o 10%. The drag reduction performance of the honeycomb microplates was investigated in a water tunnel with a high Reynolds number (from 0.5 × 10 6 to 4.6 × 10 6 ). As a result, the honeycomb microplates showed a maximum drag reduction rate of 36 ± 0.6% in comparison with the bare plates in such turbulent flow. Benefiting from the replaceable mold insert, more designable microstructure polymer surfaces can be manufactured by this rapid prototyping technique.

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Methyltrimethoxysilane based monolithic silica aerogels via ambient pressure drying

Cited by 149 publications

References 19 publications

Superhydrophobic and Omnidirectional Antireflective Surfaces from Nanostructured Ormosil Colloids

Superhydrophobic and Omnidirectional Antireflective Surfaces from Nanostructured Ormosil Colloids

Template free preparation of nanoporous organically modified silica thin films on flexible substrates

A designable surface via the micro-molding process

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