Super-Hydrophilic Lu3+-Doped TiO2 Photocatalysts for Self-Cleaning Applications

2012 ◽  
Vol 512-515 ◽  
pp. 1700-1703
Author(s):  
Wen Yuan Xu ◽  
Li Na Meng ◽  
Chuo Yang ◽  
Guo Lin Huang
Keyword(s):  
Sol Gel ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
The Self ◽  
Photocatalytic Properties ◽  
Long Time ◽  
Ft Ir ◽  
Self Cleaning ◽  
Composition Structure ◽  
And Performance

The self-cleaning glasses can be realized by coating the photoinduced super-hydrophilic Lu3+-doped TiO2 thin films via innovative ultrasonic-sol-gel route. The composition, structure and performance of the as-obtained material were characterized by XRD, SEM, FT-IR and UV-vis. The super-hydrophilicity is assessed by contact angle measurement. Photocatalytic properties of these films are evaluated by degradation of methyl orange under UV irradiation. The results indicate that the crystalline phase composition of Lu3+ doped TiO2 films is anatase, and the particle size is from 6 to 15 nm. In addition, Lu3+ doping can bring the red shift of the optical absorption edge of TiO2. The films exhibit excellent super-hydrophilicity and photocatalytic properties after UV radiation and the hydrophilicity can maintain for a long time in the dark place, which favors greatly the self-cleaning function of the films.

Preparation of TiO2–SiO2 Hybrid Nanosols Coated Flame-Retardant Polyester Fabric Possessing Dual Contradictory Characteristics of Superhydrophobicity and Self Cleaning Ability

2020 ◽  
Vol 20 (3) ◽  
pp. 1780-1789 ◽  
Author(s):  
Priyanka Katiyar ◽  
Shraddha Mishra ◽  
Anurag Srivastava ◽  
N. Eswara Prasad
Keyword(s):  
Electron Microscopy ◽  
Contact Angle ◽  
Flame Retardant ◽  
Protective Clothing ◽  
Sol Gel ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Contact ◽  
Vis Spectroscopy ◽  
Self Cleaning

TiO2, SiO2 and their hybrid nanocoatings are prepared on inherent flame retardant textile substrates from titanium(IV)iso-proproxide (TTIP) and tetraethoxysilane (TEOS) precursors using a sol–gel process followed by hydrothermal treatment. The coated samples are further functionalized by hexadecyltrimethoxysilane (HDTMS) to impart superhydrophobicity. Sample characterization of the nanosols, nanoparticles and coated samples are investigated using, X-ray diffractometer, transmission electron microscopy, scanning electron microscopy, UV-Vis spectroscopy, contact angle measurement. Stain degradation test under mild UV irradiation shows almost 54% degradation of coffee stain within 4 hours measured by Spectrophotometer. UV-Vis Absorption Spectroscopy demonstrates complete degradation of methyl orange colorant within 3 hours. Hybrid nanosol coated and HDTMS modified inherent flame retardant polyester surfaces show apparent water contact angle as ~145°, which is much closer to proximity of superhydrophobic surfaces. Thus, the novelty of present work is, by using sol–gel technique, a bi-functional textile surface has been developed which qualifies the very specific requirements of protective clothing like self-cleaning property (imparted by TiO2 nanoparticles) and superhydrophobicity (imparted by SiO2 nanoparticles and further surface modification by HDTMS), which are entirely contradictory in nature, in a single fabric itself. Thus developed textile surfaces also possess the other attributes of protective clothing like flame retardancy and air permeability.

scholarly journals The effect of molecular assembly between collectors and inhibitors on the flotation of pyrite and talc

2019 ◽  
Vol 6 (10) ◽  
pp. 191133 ◽  
Author(s):  
Tao Long ◽  
Wei Xiao ◽  
Wei Yang
Keyword(s):  
Copper Sulfide ◽  
Guar Gum ◽  
Magnesium Silicate ◽  
Selective Inhibition ◽  
Contact Angle Measurement ◽  
Molecular Assembly ◽  
Angle Measurement ◽  
Pyrite Surface ◽  
Flotation Process ◽  
Ft Ir

In the flotation process, the traditional dosing sequence is to add an inhibitor first, followed by a collector. However, in the sorting process of copper sulfide ore, this method of dosing does not effectively separate sulfide minerals and layered magnesium silicate minerals. In this study, the effect of adding a guar gum (as an inhibitor) and potassium amyl xanthate (as a collector, shortened as PAX) sequence to the flotation separation of pyrite and talc was investigated by micro-flotation tests, adsorption amount measurements, contact angle measurement and FT-IR analysis. The results show that the collector only adsorbs on the pyrite surface, while the inhibitor has a strong adsorption capacity on the pyrite and talc surface. Through the change of the order of the flotation reagent addition, PAX preferentially adsorbs on the pyrite surface, thereby preventing guar gum from adsorbing on the pyrite surface and achieving the selective inhibition of talc by guar gum. This study will help in understanding the molecular assembly between collectors and inhibitors to further treat complex copper sulfide nickel ore.

scholarly journals Sol-Gel Coatings for Subaquatic Self-Cleaning Windows

Crystals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 375
Author(s):  
Andrew I. M. Greer ◽  
David Moodie ◽  
Graham Kerr ◽  
Nikolaj Gadegaard
Keyword(s):  
North Sea ◽  
Marine Bacteria ◽  
Optical Transmission ◽  
Sol Gel ◽  
Optical Devices ◽  
The Self ◽  
Worst Case ◽  
Airborne Pollutants ◽  
Cleaning Performance ◽  
Self Cleaning

Self-cleaning windows are well known for their ability to function with airborne pollutants, but there is a growing industry for semi-permanent subaquatic optical devices, where the performance of such windows should be considered. Here sol-gel technology is explored as a means of producing self-cleaning, subaquatic, sapphire windows. We demonstrate removal of marine bacteria and, in the worst-case contamination scenario, dead North Sea crude oil (API 35). This greasy contaminant was smeared across the windows to effectively reduce optical transmission strength to just 54%. The titania-based sol-gel-coated windows can restore transmission to within 10% of the clean value in less than one day, unlike standard sapphire windows, which lose 68% transmission following contamination and aquatic submergence over the same duration. A range of theories to enhance the self-cleaning performance of the sol-gel coating were explored, but none of the tested variables were able to provide any enhancement for subaquatic performance.

Preparation of CuS/SiO2 Composite Modified Aerogel and Its Superoleophobic and Photocatalytic Properties

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050017
Author(s):  
Ke-Cheng Yang ◽  
Li-Hui Xu ◽  
Hong Pan ◽  
Li-Ming Wang ◽  
Yong Shen ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Ambient Pressure ◽  
Sol Gel ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
Sliding Angle ◽  
Nitrogen Gas ◽  
Ir Spectrometry ◽  
X Ray ◽  
Ft Ir

In this study, CuS/SiO2 composite modified aerogel was prepared by the incorporation of hollow spherical CuS into methyltrimethoxysilane-based SiO2 sol and modification with hexadecafluorodecyltriethoxysilane via acid-base catalyzed sol–gel reaction and drying under ambient pressure. The CuS/SiO2 composite modified aerogel was characterized by Fourier-transform infrared (FT-IR) spectrometry, scanning electron microscope (SEM), nitrogen gas adsorption and desorption and X-ray diffraction (XRD), respectively. The effects of CuS and fluorosilane concentration on density and porosity of aerogel, oleophobic and photocatalytic properties were evaluated. The results showed that structure and physical properties of aerogel had some effect by introducing CuS and fluorosilane, and the CuS/SiO2 composite modified aerogel with density of 0.146[Formula: see text]g/cm3 and specific surface area of 241[Formula: see text]m2/g achieved super-oleophobicity with oil contact angle of 152.8∘ and sliding angle of 10∘, and good photocatalytic properties for methylene blue.

Preparation and Characterization of Surface-Modified β-Tricalcium Phosphate/Ploy(L-Lactide) Biocomposites

2011 ◽  
Vol 197-198 ◽  
pp. 120-126 ◽  
Author(s):  
Jun Zou ◽  
Xu Bin Jiang ◽  
Jing Zhang ◽  
You Shu ◽  
Xuan Chen ◽  
...  
Keyword(s):  
Tricalcium Phosphate ◽  
Tensile Tests ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Ionic Interaction ◽  
Digital Microscope ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Surface Modified

A new surface modification method by modifying low molecular weight ploy (L-lactide) (LMW PLLA) onto the β-tricalcium phosphate (β-TCP) superfine particles has been developed. The surface-modified β-TCP is characterized by FT-IR, XRD, digital microscope and contact angle measurement, et al. FT-IR spectra confirmed that LMW PLLA was connected onto the β-TCP surface through ionic interaction. XRD results indicated that the LMW PLLA did not affect the crystalline form of β-TCP, but the XRD patterns of the p-β-TCP showed a little difference with β-TCP. The p-β-TCP particles could be dispersed uniformly in dichloromethane. In contrast, unmodified β-TCP particles are apt to agglomerate after dispersed into dichloromethane. Wet angle measurement showed that hydrolyzed LMW PLLA significantly improves hydrophobicity of modified β-TCP particles. For the preparation of composites, PLLA was mixed with β-TCP and p-β-TCP, respectively, in a ratio of 85/15 (w/w) and moulded into tensile test specimens. Tensile tests showed that mechanical properties were improved, scanning electron microscopy (SEM) exhibited that modified β-TCP is an effective approach to prepare a homogeneous composites, moreover, it indicated a better interfacial phase interaction in the composite with the p-β-TCP. Chemical bonds between filler and PLLA matrix are assumed to be formed by ionic interaction.

scholarly journals APPLICATION OF SELF–CLEANING TREATMENT ON COTTON AND PES/CO FABRIC USING TiO2 AND SiO2 COATING SYNTHESIZED BY SOL–GEL METHOD

2018 ◽  
Vol 55 (1B) ◽  
pp. 77
Author(s):  
Bui Mai Huong
Keyword(s):  
Red Wine ◽  
Sol Gel ◽  
Amorphous Sio2 ◽  
Sol Gel Process ◽  
Ft Ir ◽  
Sio2 Nanocomposites ◽  
Self Cleaning ◽  
Coated Cotton ◽  
Cleaning Treatment ◽  
Scanning Electron

The photocatalytic activity of TiO2–SiO2 coated and TiO2 coated on 100% cotton and PES/Co fabrics was investigated through the self–cleaning of red wine stains and coffee stains. It was shown that a TiO2 species could be produced at temperatures of 25 °C, 40 °C and 60 °C with acceptable photo–activity and TiO2–SiO2 nanocomposites were prepared by a sol–gel process at a low temperature. The discoloration of red wine and coffee led to CO2 evolution that was more efficient for TiO2–SiO2 coated cotton for samples than of TiO2 coated ones. The textile surface did not show any change after several consecutive light–induced discoloration cycles of a red wine stain and coffee stain. The structural properties of these nanocomposites were characterized with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT–IR). The scanning electron microscope (SEM) photo showed that the TiO2–SiO2 layer is thicker than TiO2 layer on the cotton fabric and PES/Co fabric and the Ti–particles were always surrounded by amorphous SiO2 and never alone by themselves. The TiO2–SiO2 nanocomposites were coated onto cotton and PES/Co fabrics by a simple dip–pad–dry–cure process.

scholarly journals Structural, optical and photocatalytic properties of erbium (Er3+) and yttrium (Y3+) doped TiO2 thin films with remarkable self-cleaning super-hydrophilic properties

RSC Advances ◽  
2020 ◽  
Vol 10 (29) ◽  
pp. 17247-17254
Author(s):  
Raquel da Silva Cardoso ◽  
Suélen Maria de Amorim ◽  
Gidiane Scaratti ◽  
Camilla Daniela Moura-Nickel ◽  
Rodrigo Peralta Muniz Moreira ◽  
...  
Keyword(s):  
Thin Films ◽  
The Self ◽  
Photocatalytic Properties ◽  
Tio2 Thin Films ◽  
Doped Tio2 ◽  
Glass Substrates ◽  
Self Cleaning

The self-cleaning and super hydrophilic properties of pristine TiO2 and of TiO2 doped with Er3+ or Y3+ transparent thin films deposited onto glass substrates were investigated.

The Self-Cleaning Effect of Sol-Gel Preparation of Nano-Diamond and Nano-SiC Film was Compared

2019 ◽  
Vol 807 ◽  
pp. 68-73
Author(s):  
Xiu Xia Zhang ◽  
Hai Sheng Zhang ◽  
Guan Nan Du ◽  
Shu Yi Wei ◽  
Kai Nan Zhang ◽  
...  
Keyword(s):  
Glass Substrate ◽  
Sol Gel ◽  
Contrast Material ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Gel Method ◽  
Sol Gel Method ◽  
Long Time ◽  
Self Cleaning ◽  
Gel Preparation

Through continuous experiments, scientists have found that nanomaterials have self-cleaning properties. Solar cells coated with nanometer film can keep their surface clean for a long time and maintain high photoelectric conversion efficiency. nanodiamond films were prepared on glass substrate by sol-gel method. nanosilicon carbide was also selected as the contrast material. Silicon carbide (SiC) has good chemical stability, corrosion resistance and other characteristics. nanosic films were prepared by sol-gel method on glass substrate. The production cost of sol-gel method was relatively low, the coating uniformity was suitable for mass production

Preparation of Superhydrophilic Polyethersulfone by Sol-Gel Method

2013 ◽  
Vol 785-786 ◽  
pp. 1547-1550
Author(s):  
Guang Fen Li ◽  
Jin Chao Zhang ◽  
Xu Dong Sun
Keyword(s):  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Sem Images ◽  
Simple Method ◽  
Gel Method ◽  
Sol Gel Method ◽  
Atomic Force ◽  
Infrared Spectral

Here a simple method was developed to fabricate hydrophilic Polyethersulphone film via a sol-gel process. The correspondent hydrophilicity was evaluated by infrared spectral analysis, X-ray photoelectron spectroscopy, the contact angle measurement, atomic force microscope and scanning electron microscope analysis, respectively. Both FTIR and XPS analysis indicated that the film surfaces have a relatively dense sol layer, which favors to become hydrophilic. AFM analysis demonstrated that the higher hydrophilicity was mainly attributed to the surface roughness, while SEM images show that the micro/nanometer crater-like protrusions appears on the film surfaces, whereas the spongy structures & the finger-like structures appear in cortex and intermediate layer respectively. This leads to the hydrophilic film forming after film being treated by sol-gel method.

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