Surface Science Engineering through Sol-Gel Process

Carrera‐Figueiras, Cristian; Pérez‐Padilla, Yamile; Estrella‐Gutiérrez, M. A.; Uc-Cayetano, E. G.; Juárez‐Moreno, Juan Antonio; Ávila‐Ortega, Alejandro

doi:10.5772/intechopen.83676

Cited by 18 publications

(12 citation statements)

References 126 publications

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“…The initial reaction is the catalytic hydrolysis of TEOS in the presence of water and HCl. The alkoxylated agent TEOS was used due to its affinity with water [ 15 ]. However, TEOS and water are immiscible, and thus ethanol, which acts as a homogenizing agent, was used to facilitate the hydrolysis process [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of New Sol–Gel Hybrid Inulin–TEOS Adsorbent

Yusop

Ismail

2021

Polymers

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A new biopolymer–silica hybrid material consisting of inulin and tetraethoxysilane (TEOS) for use as an adsorbent was successfully synthesized via the sol–gel method in acidic conditions. The hydrolysis and condensation processes were attained in water/ethanol solution. Three molar ratios of inulin:TEOS (1:1, 1:2, and 2:1) were prepared and dried at various temperatures (50, 60, and 70 °C). The optimized molar ratio of 2:1 with a drying temperature of 70 °C was found to obtain the best morphology and characteristics for absorbent properties. Fourier transform infrared spectroscopy (FTIR) analysis showed a strong interaction between inulin and TEOS, which was also observed using energy dispersive X-ray spectroscopy (EDX). Field emission scanning electron microscopy (FESEM) images revealed the presence of nanoparticles on the rough surface of the hybrid sol–gel. X-ray diffractometer (XRD) analysis showed the amorphous state of the silica network where the inulin existed as an anhydrous crystalline phase. Brunauer–Emmet–Teller (BET) analysis confirmed that the composite was mesoporous, with 17.69 m2/g surface area and 34.06 Å pore size. According to thermogravimetric analysis (TGA) results, the hybrid inulin-TEOS adsorbent was thermally stable under a temperature of 200 °C.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of New Sol–Gel Hybrid Inulin–TEOS Adsorbent

Yusop

Ismail

2021

Polymers

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“…[85] As in many other applications involving a template, any other sol-gel precursor can be employed, for example for obtaining titania (from TiCl 4 , tested). This allows us to variate the surface (charge and chemistry) [86][87][88][89][90][91][92] and structural (elasticity, porosity) [85,[93][94][95] properties of the material composing the nanochannel. Shape, dimensions and aspect ratio of the pillar porosity are, however, conserved since they are determined by the initial thickness and hole distance/ diameter of the block-copolymer thin film.…”

Section: Methodsmentioning

confidence: 99%

Ionic Diffusion, Nanoparticle Formation and Trapping Within Sol‐Gel Made Pillared Planar Nanochannels in a Simple Microfluidic Device

2020

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Efforts to obtain widespread applications in the field of nanofluidics are increasing in intensity in recent years. However, high cost production of nanofluidic devices through the commonly used nanofabrication technologies and the incomplete understanding of solute confinement is still delaying the development of reliable, reproducible and affordable nanofluidic tools. The concentration of species and their diffusion dynamics are strongly influenced by the nanostructure architecture and surface chemistry. Testing a large number of known geometries and surface characteristics has not been possible due to limitations in fabrication procedures. Here, we try to overcome these fabrication difficulties by making the production of large scale nanofluidic devices more viable. We use an alternative bottom‐up method based on supramolecular self‐assembly and sol‐gel chemistry to produce and integrate controlled ceramic nanoporous Pillar Planar Nanochannels (PPN) within microfluidic devices. The system provides a way to easily analyze the diffusion and reaction of species in the aforementioned nanochannels. We show how to extract the nano‐confined concentration and diffusion speed without requiring any expensive analysis instrument. Subsequently, large data sets can be obtained due to the affordability of the presented nanostructure and the ease of its analysis. Moreover, since PPNs have a periodical and regular geometry the obtained data can be compared with simulations, allowing for a better description of the nanoconfined behavior of species.

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“…This makes it an effective, simple, and cheap technology characterized by many advantages [2]. Silica-based coatings are one of such materials; they are largely developing and future-oriented because they can impart a wide variety of predetermined properties to a surface [3]. Silica coatings can be doped with various fillers or modifiers in order to improve or change their properties.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Silica–MWCNTs/PDMS Composite Coatings Deposited on Plasma Activated Glass Supports

et al. 2021

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In this paper, we focus on fabrication and physicochemical properties investigations of silica–multiwalled carbon nanotubes/poly(dimethylsiloxane) composite coatings deposited on the glass supports activated by cold plasma. Air or argon was used as the carrier gas in the plasma process. Multiwalled carbon nanotubes were modified with poly(dimethylsiloxane) in order to impart their hydrophobicity. The silica–multiwalled carbon nanotubes/poly(dimethylsiloxane) nanocomposite was synthesized using the sol–gel technique with acid-assisted tetraethyl orthosilicate hydrolysis. The stability and the zeta potential of the obtained suspension were evaluated. Then, the product was dried and used as a filler in another sol–gel process, which led to the coating application via the dip-coating method. The substrates were exposed to the hexamethyldisilazane vapors in order to improve their hydrophobicity. The obtained surfaces were characterized by the wettability measurements and surface free energy determination as well as optical profilometry, scanning electron microscopy, and transmittance measurements. In addition, the thermal analyses of the carbon nanotubes as well as coatings were made. It was found that rough and hydrophobic coatings were obtained with a high transmittance in the visible range. They are characterized by the water contact angle larger than 90 degrees and the transmission at the level of 95%. The X-ray diffraction studies as well as scanning electron microscopy images confirmed the chemical and structural compositions of the coatings. They are thermally stable at the temperature up to 250 °C. Moreover, the thermal analysis showed that the obtained composite material has greater thermal resistance than the pure nanotubes.

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Surface Science Engineering through Sol-Gel Process

Cited by 18 publications

References 126 publications

Preparation and Characterization of New Sol–Gel Hybrid Inulin–TEOS Adsorbent

Preparation and Characterization of New Sol–Gel Hybrid Inulin–TEOS Adsorbent

Ionic Diffusion, Nanoparticle Formation and Trapping Within Sol‐Gel Made Pillared Planar Nanochannels in a Simple Microfluidic Device

Surface Properties of Silica–MWCNTs/PDMS Composite Coatings Deposited on Plasma Activated Glass Supports

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