scholarly journals Silicone oil impregnated nano silica modified glass surface and influence of environmental dust particles on optical transmittance

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29762-29771 ◽  
Author(s):  
Bekir Sami Yilbas ◽  
Muhammad Rizwan Yousaf ◽  
Abdullah Al-Sharafi ◽  
Haider Ali ◽  
Fahad Al-Sulaiman ◽  
...  
Keyword(s):  
Glass Surface ◽  
Silicone Oil ◽  
Optical Transmittance ◽  
Dust Particles ◽  
Nano Silica ◽  
Self Cleaning

The behavior of environmental dust particles on a silicone oil impregnated glass surface is examined in relation to optical transparent surfaces for self-cleaning applications.

scholarly journals Avalanche effect for chemically modified dust mitigation from surfaces

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Johnny Ebaika Adukwu ◽  
Bekir Sami Yilbas ◽  
Almaz Jalilov ◽  
Hussain Al-Qahtani ◽  
Ahmet Z. Sahin ◽  
...  
Keyword(s):  
Glass Surface ◽  
High Speed ◽  
Solution Treatment ◽  
Cost Effective ◽  
Optical Transmittance ◽  
Vital Role ◽  
Dust Particles ◽  
Avalanche Effect ◽  
Fluorine Compounds ◽  
Glass Surfaces

AbstractCost effective dust mitigation from surfaces is one of the challenges in various sectors. The reduction of dust adhesion on surfaces plays a vital role for dust mitigation from surfaces under the gravitational influence. Creating an avalanche effect on dusty surfaces improves the dust mitigation rate and provides an effective cleaning process. Hence, solution treatment of dust by low concentration hydrofluoric acid is considered towards reducing dust adhesion on glass surfaces. To increase the rate of dust mitigation, the avalanche influence is created by the higher density and larger size particles (5300 kg/m3 and ~ 50 µm) than the average size dust particles (2800 kg/m3 and 1.2 µm) via locating them in the top region of the dusty glass surfaces. Mitigation velocity of the dust particles is evaluated using a high-speed recording system and the tracker program. Findings revealed that solution treatment (curing) of the dust particles results in the formation of fluorine compounds, such as CaF2 and MgF2, on dust surfaces, which suppress dust adhesion on surfaces. OSHA Globally Harmonized System lists the fluorine compounds formed as environmentally non-harmful. Avalanche's influence results in dust mitigation at a smaller tilt angle of the glass surface (~ 52°) than that of the case with none-avalanche influence (63°). Area cleaned on the glass surface, via dust mitigation, is larger as the avalanche is introduced, which becomes more apparent for the solution treated dust particles. Dust mitigation under avalanche influence improves optical transmittance of the dusty glass samples by a factor of 98%.

scholarly journals Sliding Water Droplet on Oil Impregnated Surface and Dust Particle Mitigation

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 789
Author(s):  
Saeed Bahatab ◽  
Bekir Sami Yilbas ◽  
Abba Abdulhamid Abubakar ◽  
Ghassan Hassan ◽  
Anwaruddin Siddiqui Mohammed ◽  
...  
Keyword(s):  
Dust Particle ◽  
Water Droplet ◽  
Film Surface ◽  
Optical Transmittance ◽  
Dust Particles ◽  
Sliding Velocity ◽  
Oil Film ◽  
Silicon Oil ◽  
Oil Impregnation ◽  
Self Cleaning

Self-cleaning of surfaces becomes challenging for energy harvesting devices because of the requirements of high optical transmittance of device surfaces. Surface texturing towards hydrophobizing can improve the self-cleaning ability of surfaces, yet lowers the optical transmittance. Introducing optical matching fluid, such as silicon oil, over the hydrophobized surface improves the optical transmittance. However, self-cleaning ability, such as dust mitigation, of the oil-impregnated hydrophobic surfaces needs to be investigated. Hence, solution crystallization of the polycarbonate surface towards creating hydrophobic texture is considered and silicon oil impregnation of the crystallized surface is explored for improved optical transmittance and self-cleaning ability. The condition for silicon oil spreading over the solution treated surface is assessed and silicon oil and water infusions on the dust particles are evaluated. The movement of the water droplet over the silicon oil-impregnated sample is examined utilizing the high-speed facility and the tracker program. The effect of oil film thickness and the tilting angle of the surface on the sliding droplet velocity is estimated for two droplet volumes. The mechanism for the dust particle mitigation from the oil film surface by the sliding water droplet is analyzed. The findings reveal that silicon oil impregnation of the crystallized sample surface improves the optical transmittance significantly. The sliding velocity of the water droplet over the thick film (~700 µm) remains higher than that of the small thickness oil film (~50 µm), which is attributed to the large interfacial resistance created between the moving droplet and the oil on the crystallized surface. The environmental dust particles can be mitigated from the oil film surface by the sliding water droplet. The droplet fluid infusion over the dust particle enables to reorient the particle inside the droplet fluid. As the dust particle settles at the trailing edge of the droplet, the sliding velocity decays on the oil-impregnated sample.

Electrical and Optical Properties of Silicone Oil/Carbon Nanotube Nanocomposites

2021 ◽  
Vol 21 (4) ◽  
pp. 2185-2195
Author(s):  
Jeferson Matos Hrenechen ◽  
Celso de Araujo Duarte ◽  
Ney Pereira Mattoso Filho ◽  
Evaldo Ribeiro
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Conduction Mechanism ◽  
Silicone Oil ◽  
Optical Transmittance ◽  
Liquid Matrix ◽  
Electrical And Optical Properties ◽  
Multiwalled Carbon ◽  
Liquid Matrices ◽  
The Matrix

The present work describes the preparation and the investigation of the room temperature electrical and optical properties of a series of liquid nanocomposites (lnC) prepared with different concentrations of multiwalled carbon nanotubes (MWCNT) in a variety of liquid matrices: glycerin, Vaseline, glucose, propylene glycol and silicone oil (SIO). Special attention is deserved to the SIO matrix, owing to its convenient electrical properties for our purposes. We verified that a small percent fraction of MWCNT dispersed along the SIO matrix is capable of improving the electrical conductivity of the matrix by orders of magnitude, indicating that the MWCNT strongly participates in the electrical conduction mechanism. Also, the application of an external electric field to this lnC resulted in large changes in the optical transmittance, that were interpreted as a consequence of the fieldinduced MWCNT alignment into the liquid matrix. The characteristics of such a new category of nanocomposite in the liquid state suggest further studies.

Development of Transparent Electrodynamic Screens on Ultrathin Flexible Glass Film Substrates for Retrofitting Solar Panels and Mirrors for Self-Cleaning Function

MRS Advances ◽  
2016 ◽  
Vol 1 (15) ◽  
pp. 1003-1012 ◽  
Author(s):  
M. K. Mazumder ◽  
J. W. Stark ◽  
C. Heiling ◽  
M. Liu ◽  
A. Bernard ◽  
...  
Keyword(s):  
Large Scale ◽  
Transmission Efficiency ◽  
Silver Nanowire ◽  
Dust Particles ◽  
Glass Film ◽  
Solar Collectors ◽  
Solar Panels ◽  
Labor Costs ◽  
Adhesive Film ◽  
Self Cleaning

ABSTRACTDevelopment of transparent electrodynamic screens (EDS) printed on ultrathin flexible glass film substrates for retrofitting on solar panels and solar mirrors to perform self cleaning function is reviewed. Large-scale solar plants are generally installed in semi-arid and desert areas where dust layers build up on solar collectors causes major energy-yield loss. Maintaining designed plant capacities requires more than 90% reflectivity for CSP mirrors and 90% transmission efficiency for PV modules; solar collectors must therefore be cleaned at a frequency depending on the rate of dust deposition. Scarcity of water in these regions requires a cleaning method that drastically reduces or eliminates water and the associated labor costs for high efficiency operation of large-scale solar plants. An EDS film consists of rows of interdigitated, transparent conducting parallel electrodes embedded within a flexible ultrathin glass film and an optically clear adhesive film used for retrofitting the film on the surface of solar collectors. When phased voltage pulses activate the electrodes, the dust particles are first electrostatically charged, then repelled and removed from the surface of the solar collectors by Coulomb force, restoring transmission efficiency greater than 90%. The electrodes of EDS are either made from silver nanowire or another conductive transparent material printed on a highly transparent, ultrathin (100-μm thick), flexible borosilicate glass film. Applications of different conducting transparent electrodes and methods of printing are reviewed for optimizing self-cleaning function of solar panels and mirrors.

Characteristics of oil impregnated hydrophobic glass surfaces in relation to self-cleaning of environmental dust particles

2017 ◽  
Vol 171 ◽  
pp. 8-15 ◽  
Author(s):  
Aditia Rifai ◽  
Numan Abu-Dheir ◽  
Mazen Khaled ◽  
Nasser Al-Aqeeli ◽  
Bekir Sami Yilbas
Keyword(s):  
Dust Particles ◽  
Self Cleaning ◽  
Glass Surfaces

scholarly journals Long-time optical transmittance measurements of silica nanofibers

2020 ◽  
Vol 238 ◽  
pp. 08011
Author(s):  
Maha Bouhadida ◽  
Sylvie Lebrun
Keyword(s):  
Optical Transmittance ◽  
Dust Particles ◽  
Dramatic Decrease ◽  
Long Time ◽  
Fundamental Reason ◽  
Silica Nanofibers

We perform long-time measurements of the optical silica transmittance during several months in different environments and with different nanofiber lengths. These measurements are repeatable and give guidelines to control and to improve the lifetime and the performances of the nanofiber. The dust particles on the nanofiber surface is the fundamental reason behind its degradation. Enhancing the cleanness conditions of the nanofiber environment makes its lifetime increases significantly (from some hours to some months) and enables to avoid the dramatic decrease of its transmittance even after months. The nanofiber length does not contribute to the nanofiber transmittance degradation. Stabilizing the nanofiber transmittance after its decrease is possible by putting in in a dust free box.

scholarly journals Environmental dust removal from inclined hydrophobic glass surface: avalanche influence on dynamics of dust particles

RSC Advances ◽  
2018 ◽  
Vol 8 (59) ◽  
pp. 33775-33785 ◽  
Author(s):  
Bekir Sami Yilbas ◽  
Abdullah Al-Sharafi ◽  
Haider Ali ◽  
Nasser Al-Aqeeli ◽  
Hussain Al-Qahtani ◽  
...  
Keyword(s):  
Glass Surface ◽  
Dust Removal ◽  
Dust Particles ◽  
Transparent Glass ◽  
Optically Transparent ◽  
Glass Surfaces

The removal of environmental dust particles from optically transparent glass surfaces is considered, and the dynamics of the dust particles on the inclined hydrophobic glass surface is examined.

Low cost single step synthesis of nano-silica from silicone oil

2018 ◽  
Vol 08 ◽  
Author(s):  
Shivnarayan Sai ◽  
L.A. Avinash Chunduri ◽  
Prathibha Chinnakota ◽  
Sandeep Patnaik ◽  
Venkataramaniah Kamisetti
Keyword(s):  
Silicone Oil ◽  
Low Cost ◽  
Single Step ◽  
Nano Silica

scholarly journals An active self-cleaning surface system for photovoltaic modules using anisotropic ratchet conveyors and mechanical vibration

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Di Sun ◽  
Karl F. Böhringer
Keyword(s):  
Mechanical Vibration ◽  
Surface Cleaning ◽  
Water Soluble ◽  
Dust Particles ◽  
Solar Module ◽  
Free Process ◽  
Droplet Transport ◽  
Custom Made ◽  
Surface System ◽  
Self Cleaning

Abstract The purpose of this work is to develop an active self-cleaning system that removes contaminants from a solar module surface by means of an automatic, water-saving, and labor-free process. The output efficiency of a solar module can be degraded over time by dust accumulation on top of the cover glass, which is often referred to as “soiling”. This paper focuses on creating an active self-cleaning surface system using a combination of microsized features and mechanical vibration. The features, which are termed anisotropic ratchet conveyors (ARCs), consist of hydrophilic curved rungs on a hydrophobic background. Two different ARC systems have been designed and fabricated with self-assembled monolayer (SAM) silane and fluoropolymer thin film (Cytop). Fabrication processes were established to fabricate these two systems, including patterning Cytop without degrading the original Cytop hydrophobicity. Water droplet transport characteristics, including anisotropic driving force, droplet resonance mode, cleaning mechanisms, and system power consumption, were studied with the help of a high-speed camera and custom-made test benches. The droplet can be transported on the ARC surface at a speed of 27 mm/s and can clean a variety of dust particles, either water-soluble or insoluble. Optical transmission was measured to show that Cytop can improve transmittance by 2.5~3.5% across the entire visible wavelength range. Real-time demonstrations of droplet transport and surface cleaning were performed, in which the solar modules achieved a 23 percentage-point gain after cleaning.

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