Polymethylhydrosiloxane-based organic–inorganic hybrids for amphiphobic coatings

Nagappan, Saravanan; Park, Jin Joo; Hong, Suk Ki; Jeong, Young Sik; Lee, Won‐Ki; Ha, Chang‐Sik

doi:10.1080/15685543.2013.762892

Cited by 19 publications

(7 citation statements)

References 41 publications

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“…FTIR spectroscopy showed the important peaks of PMHS, such as Si-H, Si-O-Si and Si-CH3 at 2170 cm -1 , 1030-1130 cm -1 and 1260 cm -1 (Figure 7a), respectively [20,21]. The disappearance of a Si-H peak at 2170 cm -1 and the splitting of the Si-O-Si peaks to 1037 cm -1 and 1122 cm -1 confirmed the self-hydroxylation and condensation of PMHS under NaOH (Figure 7b) [5].…”

Section: Resultsmentioning

confidence: 99%

“…PMHS is a siloxane-based transparent liquid with potential use in a wide range of applications owing to its high thermal stability, inertness to air and moisture, solubility in common organic solvents, hydrophobicity, and low surface energy [16][17][18]. Some uses of PMHS include superhydrophobic materials, catalysis, preparation of highly transparent and anti-stain substrates, liquid crystalline polymers (LCPs), ceramics, and the formation of nano necklaces [5,9,15,[19][20][21][22][23]. Despite of several advantages of PMHS, to the best of authors' knowledge, the use of PMHS for the synthesis of superhydrophobic materials and their uses for practical applications were limited [5,24,25].…”

Section: Introduction*mentioning

confidence: 99%

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Effect of Sodium Hydroxide on the Fast Synthesis of Superhydro-phobic Powder from Polymethylhydrosiloxane

Nagappan

2014

J. Coat. Sci. Technol.

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The paper reports the role of sodium hydroxide in the synthesis of a superhydrophobic powder from polymethylhydrosiloxane (PMHS) in the presence of ethanol and water. The effects of other basic and acidic solutions as well as the absence of water were also investigated. PMHS exhibited rapid gelation (from 8 h to 2 h) by increasing the concentration of sodium hydroxide in the presence of ethanol and water. In contrast, gelation did not occur in the absence of sodium hydroxide or water or in the presence of acidic solutions. Delayed gelation (96 h to 120 h) occurred as a result of the introduction of dipotassium hydrogen phosphate trihydrate. Superhydrophobic powder was obtained by the evaporation of solvents from the gelated sol at 150 °C. The surface properties of the superhydrophobic powder were examined by scanning electron microscopy, high resolution transmission electron microscopy, N2 sorption isotherm, and X-ray diffraction. The particle size, functional groups and thermal stability of the powder were analyzed by dynamic light scattering spectroscopy, Fourier transform infrared spectroscopy, 29 Si cross polarization magic angle spinning nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. The surface properties of the powder were also assessed by contact angle measurements. The results showed that increasing the concentration of sodium hydroxide added to PMHS or increasing the drying temperature of the gelated sol resulted in the more rapid formation of superhydrophobic powder.

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Section: Resultsmentioning

confidence: 99%

Section: Introduction*mentioning

confidence: 99%

Effect of Sodium Hydroxide on the Fast Synthesis of Superhydro-phobic Powder from Polymethylhydrosiloxane

Nagappan

2014

J. Coat. Sci. Technol.

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“…The sharp innovation in nanotechnology is one of the main reasons for the development of "smart" functional coatings which can be used for a variety of applications including antifogging [1] and anti-icing coatings [2][3][4], scratch-resistant coatings [5][6][7], anti-stain coatings [8,9], moisture-resistant coatings [10][11][12], oil-repellent coatings [13,14], self-cleaning coatings [15][16][17], antimicrobial coatings [18][19][20][21][22], UV protection coatings [23,24], adhesive coatings [25], and anticorrosive self-healing coatings [26][27][28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Recent Approaches for Designing Nanomaterials-Based Coatings for Corrosion Protection

Abu-Thabit¹,

Makhlouf²

2015

Handbook of Nanoelectrochemistry

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Nanotechnology-based coatings have shown remarkable growth in recent years in many strategic industries such as automotive, aerospace, petroleum, electronics, etc. The unique characteristics that can be offered from nanotechnology are one of the main driving forces for the sharp innovation in coatings technology nowadays. Nanocoatings have recently been proposed to add functionalities to the materials to be coated such as anticorrosion self-healing, anti-icing, self-cleaning, etc. Different types of nanomaterials have been incorporated in anticorrosion coatings by adopting various approaches. The basic approach utilizes incorporation of inorganic nanomaterials with the traditional organic coatings to enhance certain functionality of the formulated nanocomposite coating. However, one of the recent trends in nanotechnology is to design nanomaterial-based coatings of multifunctionality. These include stimuliresponsive/smart coatings, self-healing coatings, organic/inorganic hybrid coatings, and electroactive coatings. This chapter highlights these emerging nanotechnologies and presents the most recent achievements in this area.

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“…PMHS is a low molecular weight siloxane based material, which is used widely in many applications such as fabrication of superhydrophobic surface and materials, catalysis, transparent surface fabrications, actuators, and etc. [6,7,[27][28][29]. This is due to ease of availability and non-toxic properties of PMHS.…”

Section: Introductionmentioning

confidence: 99%

“…Transparent substrates with several surface properties such as superhydrophilic (contact angle, CA, ≤5°), hydrophilic (CA, <90°), hydrophobic (CA ≥90°) and superhydrophobic (CA ≥150°) surfaces were prepared using various organic and inorganic hybrid materials [1][2][3][4][5]. These types of substrates were used widely in a range of applications such as anti-stain coating, anti-fogging, solar cell, flexible substrate fabrication, self-cleaning, and anti-icing coatings [6][7][8][9][10][11]. The coating methods such as dip coating, spin coating, spraying, and casting methods were used for the preparation of transparent substrates [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Preparation of superhydrophobic and transparent micro-nano hybrid coatings from polymethylhydroxysiloxane and silica ormosil aerogels

Nagappan

Park

2014

Nano Convergence

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Superhydrophobic and transparent polymethylhydroxysiloxane (PMHOS)/silica ormosil aerogel hybrids were prepared successfully by mixing of PMHOS with various weight percentages of silica ormosil aerogels (as synthesized from methyltriethoxysilane (MTES) and methyltrimethoxysilane (MTMS) precursors) in separate seal perfume glass vials. The hybrids were spin coated on glass substrate at 1000 rpm for 60 seconds and used for further analysis. The surface morphology and chemical compositions of the hybrids were analyzed by high resolution scanning electron microscopy, high resolution transmission electron microscopy, atomic force spectroscopy, adsorption and desorption isotherm, and X-ray photoelectron spectroscopy. The transparency, thermal decomposition and static contact angle (SCA) of each sample were measured by UV-Visible spectrophotometer, TGA and drop shape analysis system, respectively. The spin coated substrates showed good superhydrophobic properties, thermal stability as well as transparency on the glass substrates.Keywords: Superhydrophobic; Transparent; Polymethylhydroxysiloxane; Silica ormosils; Micro-nano hybrid BackgroundTransparency of a substrate is an important factor for coating applications. Transparent substrates with several surface properties such as superhydrophilic (contact angle, CA, ≤5°), hydrophilic (CA, <90°), hydrophobic (CA ≥90°) and superhydrophobic (CA ≥150°) surfaces were prepared using various organic and inorganic hybrid materials [1][2][3][4][5]. These types of substrates were used widely in a range of applications such as anti-stain coating, anti-fogging, solar cell, flexible substrate fabrication, self-cleaning, and anti-icing coatings [6][7][8][9][10][11]. The coating methods such as dip coating, spin coating, spraying, and casting methods were used for the preparation of transparent substrates [12][13][14][15]. Nakajima et al. prepared transparent superhydrophobic surface by spin coating method under the sublimation of aluminum acetylacetonate (AACA) followed by fluorosilane treatment [16]. In another method, the authors also fabricated similar type of transparent superhydrophobic surface using AACA and titanium acetylacetonate (TACA) and fluorosilane [17]. The obtained superhydrophobic surface showed almost 100% transparency when the concentration of TiO 2 was lower than 20%. Meanwhile, increasing the concentration of TiO 2 would lead to reduce the transparency of the coated substrate. Xu et al. recently prepared highly transparent superhydrophobic substrates by spin coating of fluorinated silica nanoparticles on silica wafer or other substrates [18]. The spin coated substrates can produce over 95% of transparency with superhydrophobicity. Fluorine based silane precursors of low surface energy were used widely for changing the hydrophobic surface to superhydrophobic surface [19,20]. This is due to the formation of thin layers of hydrophobic low surface energy materials on the pretreated hierarchical substrates. On the other hand, this might depend on the concentrati...

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Polymethylhydrosiloxane-based organic–inorganic hybrids for amphiphobic coatings

Cited by 19 publications

References 41 publications

Effect of Sodium Hydroxide on the Fast Synthesis of Superhydro-phobic Powder from Polymethylhydrosiloxane

Effect of Sodium Hydroxide on the Fast Synthesis of Superhydro-phobic Powder from Polymethylhydrosiloxane

Recent Approaches for Designing Nanomaterials-Based Coatings for Corrosion Protection

Preparation of superhydrophobic and transparent micro-nano hybrid coatings from polymethylhydroxysiloxane and silica ormosil aerogels

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