Single Step Synthesis and Functionalization of Nano Titania for Development of Multifunctional Cotton Fabrics

Synthesis and modification of nanoparticles to make them suitable to functionalise a substrate for various application fields involves many steps, which are complex, time-consuming, and sometimes require special equipment. This is a major drawback to meet rapid technological requirements. In this work, a procedure has been developed to modify TiO2 nanoparticles by the sol-gel method at their synthesis stage using titanium tetraisopropoxide and modifying agents including ODS and GPTMS. The prepared nanoparticle finish can be used as it is without any further processing, thus eliminating the need for extra steps required to decorate them on some substrate. The nanoparticles were characterised by SEM, EDX, FTIR, XRD, and zeta potential. The adhesion of the obtained nanoparticles was tested by applying them to a cellulosic substrate. The obtained substrate was subjected to mechanical action and adhesion efficiency was estimated on the basis of UV transmittance and antibacterial properties that showed excellent results. The hydrophobic properties of the obtained nanoparticles were assessed by measuring water contact angles, which reached 157.9°, indicating their superhydrophobic nature. The developed procedure is facile and will be suitable for the engineering of multiple surfaces.

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Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

Applied Sciences ◽

10.3390/app112211044 ◽

2021 ◽

Vol 11 (22) ◽

pp. 11044

Author(s):

Violeta Purcar ◽

Valentin Rădițoiu ◽

Alina Rădițoiu ◽

Florentina Monica Raduly ◽

Georgiana Cornelia Ispas ◽

...

Keyword(s):

Polyvinyl Chloride ◽

Sol Gel ◽

Contact Angles ◽

Hybrid Coatings ◽

Water Contact ◽

Silica Coatings ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Silica Materials ◽

Window Blinds

In this research, we report a simple and inexpensive way to prepare transparent and hydrophobic hybrid coatings through deposition of different silica materials on polyvinyl chloride (PVC) substrates. The silica materials were prepared using an acid-catalyzed sol–gel method at room temperature (25 ± 2 °C), using alkoxysilanes: tetraethoxysilane (TEOS), as the silica source, and ethoxydimethylvinylsilane (DMVES), triethoxyoctylsilane (OTES), and trimethoxyhexadecylsilane (HDTMES), as modifier agents. The obtained materials were characterized (either as powders or as thin films) by Fourier-transform infrared spectroscopy (FTIR), UV/Vis spectroscopy, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), atomic force microscopy (AFM), spectroscopic ellipsometry (SE), and water contact-angle measurements. UV/Vis spectra showed that the PVC substrate coated with the silica material containing TEOS/DMVES/OTES had a transmittance of about 90% in the wavelength range of 650–780 nm. The water contact angles increased from 83° for uncoated PVC substrate to ~94° for PVC substrates coated with the sol–gel silica materials. These PVC films with hybrid silica coatings can be used as the materials for outdoor applications, such as energy-generating solar panel window blinds or PVC clear Windmaster outdoor blinds.

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Hydrophobic Starch-Based Films Using Potato Washing Slurries and Spent Frying Oil

Foods ◽

10.3390/foods10122897 ◽

2021 ◽

Vol 10 (12) ◽

pp. 2897

Author(s):

Sílvia Petronilho ◽

André Oliveira ◽

M. Rosário Domingues ◽

Fernando M. Nunes ◽

Manuel A. Coimbra ◽

...

Keyword(s):

Potato Starch ◽

Contact Angles ◽

Single Step ◽

Frying Oil ◽

Biodegradable Films ◽

Water Contact ◽

Alkaline Catalyst ◽

Application Range ◽

Structural Differences

Starch is a promising candidate for preparing biodegradable films with useful gas barriers and thermoplastic capabilities. However, these materials are hydrophilic and brittle, thus limiting their application range. To overcome these drawbacks, it has been hypothesized that starch can be hydrophobized and plasticized during the starch-based film production using a single-step approach and following transesterification principles. In this work, KOH powder and spent frying oil (SFO) were used as an alkaline catalyst and a source for triacylglycerides, respectively, to promote the modification of starch. Different ratios of SFO (w/w related to the dried starch weight) were tested. When compared to the neat films (without a catalyst and SFO), the incorporation of at least 15% SFO/KOH gave rise to transparent, hydrophobic (water contact angles of ca. 90°), stretchable (ca. 20×), elastic (ca. 5×), and water tolerant starch-based films, contrary to the films produced without the catalyst. ATR-FTIR and 1H NMR revealed structural differences among the produced films, suggesting that starch was modified with the SFO-derived fatty acids. Therefore, adding KOH during the potato starch/spent frying oil-based film’s production was determined to be a promising in situ strategy to develop starch-based materials with improved hydrophobicity and flexibility, while valorizing the potato chip industry’s byproducts.

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Synthesis and Characterization of ZnO-SiO2/Epoxy Nanocomposite Coating by Sol-Gel Process

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.16.1 ◽

2012 ◽

Vol 16 ◽

pp. 1-7

Author(s):

Nazanin Farhadyar ◽

Mirabdullah Seyed Sadjadi

Keyword(s):

Polyethylene Glycol ◽

Sol Gel ◽

Nanocomposite Coating ◽

Contact Angles ◽

Hybrid Coatings ◽

Coating Film ◽

Water Contact ◽

Unit Form ◽

Hybrid Solution ◽

Sol Gel Process

In this paper, we report preparation of hydrophilic hybrid nanocomposite coatings on glass substrates using Zinc acetate solutions based on 3-glycidoxypropyltrimethoxysilane (GPTMS), epoxy resin, aromatic amine (HY850), polyethylene glycol (PEG) and surfactant (polyoxyethylene(4)laurylether) by the sol-gel process. Furthermore, the effects of PEG addition to the precursor solutions on the hydrophilic property and microstructure of the resultant coating film were studied. The hydrophilic behavior study of the synthesized hybrid was performed by adding different amounts of polyethylene glycol precursor to the hybrid solution. Experimental results show that, among different amounts of PEGs, the best results are obtained by addition of PEGs (400) to the hybrid solution which can decrease the water contact angles down to 16 and using surfactant down to 0, and increase the free surface energy. Coated glass exhibits a higher strength than uncoated glass. Attenuated total reflectance infrared spectroscopic (ATR-IR) technique was used to characterize the structure of the hybrid films. The chemical structure of obtained network affects morphology of the coating. The morphology of the hybrid coatings was examined by transmission electron microscopy (TEM). The hybrid systems have a unit form structure and the inorganic phases were in the nanosize scale,

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Preparation of TiO2 Thin Films and its Superhydrophilic Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.620-622.695 ◽

2009 ◽

Vol 620-622 ◽

pp. 695-698

Author(s):

Jing Ma ◽

Wen Xiu Liu ◽

Xiao Guang Qu ◽

Dan Ni Yu ◽

Wen Bin Cao

Keyword(s):

Thin Film ◽

Tio2 Thin Film ◽

Annealing Temperature ◽

Sol Gel ◽

Soda Lime ◽

Contact Angles ◽

Soda Lime Glass ◽

Water Contact ◽

Different Temperatures ◽

Hydrolysis Of

TiO2 thin film was prepared on soda lime glass by hydrolysis of Ti(OC4H9)4 in alcoholic solutions by sol-gel method combined with spin-coating and calcination different temperatures. Prepared samples were characterized by XRD, FESEM, and measurement of contact angles and transmittance. XRD identification reveals that the films are composed of anatase TiO2 when the annealing temperature was set at 450~550 oC. SiO2 layer was coated on the surface of the glass firstly to barrier the diffusing of sodium ions from the substrate. Light-induced superhydrophilicity of the TiO2 thin film has been investigated. To increase the illumination light intensity will decrease the water contact angle. The superhydrophilicity of the TiO2 thin film will disappear more slowly in the dark than that in the field of ultrasound.

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Facile Approach to Develop Hierarchical Roughness fiber@SiO2 Blocks for Superhydrophobic Paper

Materials ◽

10.3390/ma12091393 ◽

2019 ◽

Vol 12 (9) ◽

pp. 1393 ◽

Cited By ~ 5

Author(s):

Qing Wang ◽

Jieyi Xiong ◽

Guangxue Chen ◽

Ouyang Xinping ◽

Zhaohui Yu ◽

...

Keyword(s):

Large Scale ◽

Low Cost ◽

Sol Gel ◽

Sio2 Nanoparticles ◽

Contact Angles ◽

Preparation Process ◽

Water Contact ◽

Mechanical Durability ◽

Complex Preparation ◽

Superhydrophobic Paper

Papers with nanoscaled surface roughness and hydrophobically modification have been widely used in daily life. However, the relatively complex preparation process, high costs and harmful compounds have largely limited their applications. This research aims to fabricate superhydrophobic papers with low cost and nontoxic materials. The surface of cellulose fibers was initially coated with a film of SiO2 nanoparticles via sol-gel process. After papermaking and subsequent modification with hexadecyltrimethoxysilane through a simple solution-immersion process, the paper showed excellent superhydrophobic properties, with water contact angles (WCA) larger than 150°. Moreover, the prepared paper also showed superior mechanical durability against 10 times of deformation. The whole preparation process was carried out in a mild environment, with no intricate instruments or toxic chemicals, which has the potential of large-scale industrial production and application.

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THE STABILITY OF SUPERHYDROPHOBIC COTTON FABRICS PREPARED BY SOL–GEL COATING OF SiO2 AND TiO2

Surface Review and Letters ◽

10.1142/s0218625x13500649 ◽

2013 ◽

Vol 20 (06) ◽

pp. 1350064 ◽

Cited By ~ 7

Author(s):

XUE-WEI WANG ◽

CUI GUO ◽

ZHI-HAO YUAN

Keyword(s):

Uv Light ◽

Sol Gel ◽

Volume Ratio ◽

Sodium Silicate Solution ◽

Cotton Fabrics ◽

Contact Angles ◽

Light Irradiation ◽

Water Contact ◽

Uv Light Irradiation ◽

Silica And Titania

Superhydrophobic cotton fabrics are prepared using silica and titania hybrid sol and hexadecyltrimethoxysilane. The surface morphology of cotton fabrics is characterized by scanning electron microscopy. The water contact angles on the as-prepared superhydrophobic cotton fabrics is 159° when the volume ratio between sodium silicate solution and titania sol is 1:3, and the corresponding cotton fabrics can keep the contact angle of 152° after 10 cycles of home machine washing. Meanwhile the treated cotton fabrics can also keep superhydrophobicity after 60 min of UV light irradiation. These results indicate that the cotton fabrics treated with silica and titania hybrid sol and modified with hexadecyltrimethoxysilane show excellent superhydrophobic stability under washing and UV light irradiation. This paper provides the new notion and beneficial reference for the application of the superhydrophobic cotton fabrics in the future.

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Multifunctional nanocomposite transparent UV-blocking films sythesized by sol-gel process for optical, automotive and aeronautic applications

MRS Proceedings ◽

10.1557/proc-0901-ra16-30-rb16-30 ◽

2005 ◽

Vol 901 ◽

Author(s):

Phani Ratna Ayalasomayajula ◽

S. Santucci

Keyword(s):

Thin Films ◽

Contact Angle ◽

Morphological Changes ◽

Sol Gel ◽

Chemical Properties ◽

Contact Angles ◽

Nanocomposite Films ◽

Energy Materials ◽

Water Contact ◽

Uv Blocking

AbstractDevelopment of UV blocking thin films with effective cut-off features with steep edges and high transmission in the visible and IR region have been developed. The unique optical, mechanical and chemical properties of silica and ceria nanocomposites with surface functional groups making them most promising candidate for applications in opto-electronic, automotive, and aeronautic industries. On the other hand, highly hydro and oleophobic films are being actively considered in optical, automotive and aeronautic industries to increase adhesion and scratch, abrasion resistance properties. In order to fill the gap, and fulfill the requirements to meet both ends, it could be proved that morphological changes in the nanometer range influences the water contact angles and their hystersis of low energy materials. Nanocomposite films of SiO2 and CeO2 with surface functionalisation with decafluorooctly-triethoxy silane itself forms nano-hemispheres (similar to lotus leaf) at and above 100°C favoring an increase in water contact angle from 122° (25°C) to 145°(400°C). The structural, optical, and hydrophobic properties have been examined by employing X-ray diffraction, UV-visible spectroscopy, contact angle techniques, respectively. The cut-off behavior of the deposited and annealed nanocomposite thin films have been tuned by varying different amounts of CeO2 in SiO2.

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Fabrication of Superhydrophobic Surface of TiO2 through Sol-Gel Process on Stainless Steel Substrate

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.1032 ◽

2012 ◽

Vol 512-515 ◽

pp. 1032-1035 ◽

Cited By ~ 1

Author(s):

Ya Wei Hu ◽

Hui Rong He ◽

Yang Min Ma

Keyword(s):

Stainless Steel ◽

Steel Substrate ◽

Sol Gel ◽

Dip Coating ◽

Contact Angles ◽

Tio2 Coating ◽

Crystallographic Structure ◽

Stainless Steel Surface ◽

Water Contact ◽

Sol Gel Process

Nano-structured TiO2 coating was constructed through sol-gel process and dip-coating method on the stainless steel surface using tetra-n-butyl titanate as precursor. The phase and the crystallographic structure of the TiO2 coating were characterized by an X-ray diffractometer (XRD), and the surface topography and structures of the TiO2 coating were characterized by a scanning electron microscope (SEM). The superhydrophobic property of the TiO2 coating modified with the fluoroalkylsilane (FAS, CF3(CF2)7CH2CH2Si(OCH3)3) was characterized by the water contact angles. It was observed that the TiO2 coating showed superhydrophobicity with water contact angle 155.3° after modifying with FAS, and the superhydrophobicity was corrosion-resistance.

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Optical Transparent and Hydrophobic Properties of TEOS/OTES Hybrid Materials by Sol-Gel Processing

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.798.134 ◽

2019 ◽

Vol 798 ◽

pp. 134-139

Author(s):

Usanee Pantulap ◽

Benjamon Petchareanmongkol ◽

Waraporn Kaewdang ◽

Kanit Tapasa

Keyword(s):

Contact Angle ◽

Sol Gel ◽

Contact Angles ◽

Light Transmittance ◽

Film Properties ◽

Water Contact ◽

Atomic Force ◽

Commercial Glass ◽

Gel Processing ◽

Hydrolysis Of

The objective of this project was to develop the hydrophobic film for self-cleaning glasses. The effects of octyltriethoxysilane (OTES) additions to hydrolysis of tetraethylorthosilicate (TEOS) on hydrophobic and optically transparent properties were studied. The film was prepared by sol-gel method from the precursors namely, TESO, OTES, isopropanol alcohol (IPA), and deionized water (DI). The sols for coating were obtained with TEOS/OTES ratio of 50:50 to 99:1. The sols were deposited on a commercial glass and dried at 60oC for an hour. After drying, the film properties were characterized by fourier transform infrared spectroscopy (FTIR), UV-VIS Spectrophotometer, x-Ray Diffractometer (XRD), atomic force microscope (AFM), optical microscopy and contact angle meter. It was found that contact angles of the hybrid films increased with the OTES addition, reaching a maximum at 10 wt.%, and the contact angle values were the same as for further addition. The light transmittance was rather stable with increasing amounts of OTES. For the optimized condition, the water contact angle of 108o and light transmittance of 91%, was obtained with TEOS/OTES ratio of 90:10.

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