Sol-Gel Protective Coatings For Black Chrome Solar Selective Films

1982 ◽  
Author(s):  
R. B. Pettit ◽  
C. J. Brinker
Keyword(s):  
Protective Coatings ◽  
Sol Gel

Photophysical Properties of CdS Nanoparticles in Thin Films for Opto-Chemical Sensing

2004 ◽  
Vol 820 ◽  
Author(s):  
Elena A. Guliants ◽  
Barbara A. Haruff ◽  
James R. Gord ◽  
Christopher E. Bunker
Keyword(s):  
Thin Films ◽  
Organic Compounds ◽  
Protective Coatings ◽  
Photophysical Properties ◽  
Sol Gel ◽  
Liquid Solution ◽  
Optical Signal ◽  
Cds Nanoparticles ◽  
Trap States ◽  
Post Synthesis

AbstractIn recent years, II-VI compound semiconductor nanoparticles synthesized in a liquid solution have been shown to possess unique optoelectronic properties which are highly attractive for the fabrication of various sensors based on the optical signal readout scheme. The challenge has been to immobilize these nanoparticles into films on solid surfaces, i.e. on a chip, so that they do not suffer any property deterioration as a sensing medium. In the presented work, synthesis of CdS nanoparticles in reverse micelle solution using AOT surfactant as a stabilizer has led to particles with relatively bright photoemission identified as originating from both shallow and deep traps inside the bandgap. Moreover, slightly altering the preparation procedure has produced samples with two distinctive crystal structures. Both types of CdS nanoparticles suspended in commonly utilized solvents such as chloroform and hexane were subject to chemical quenching when various organic compounds were introduced into the solution, demonstrating the sensitivity of trap states to their chemical environment. However, the two structures have shown very different optical properties. While post-synthesis treatment had no effect on one type of particle, the other type was able to undergo a photochemical reaction via prolonged UV irradiation, which resulted in an increased luminescence quantum yield ÖL from 2% to 14%. The same particle type was also responsive to thermal treatment, showing even higher values of ÖL (∼40%). The CdS/AOT particles have been cast into thin films by spin-coating on a Si wafer. Coating parameters have been investigated in order to achieve optimal control over the film thickness, uniformity, overall film durability, etc. These nanostructured films capped with various porous polymeric and sol-gel protective coatings were exposed to a series of organic compounds. Photoluminescence data collected for these samples served for identification of the compounds and their concentrations. This paper offers the discussion of photophysical response in CdS nanoparticle-based thin films with respect to development of novel nanostructured opto-chemical sensors.

Glasses and Multi-Component Sol-Gels for Use as High-Temperature Protective Coatings

1990 ◽  
Vol 180 ◽  
Author(s):  
Lauri J. Devore ◽  
Nora R. Osborne
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Ambient Temperature ◽  
Titanium Aluminide ◽  
Protective Coatings ◽  
Sol Gel ◽  
Film Coatings ◽  
Interfacial Conditions ◽  
Thin Film Coatings

ABSTRACTTwo multi-component sol-gel compositions were developed and compared to several commercially available high-temperature glasses. All were then used and characterized as protective coatings for intermetallic titanium aluminide.The sol-gels were studied as thin film coatings and the commercial glasses were studied as enameled coatings. Attention was given to (1) the effect of the application temperature on the original microstructure of the metal, and (2) the role of interfacial conditions between the glass and metal in cyclic and isothermal thermal cycles between ambient temperature and 760°C (1400°F).

Sol-Gel Protective Films for Metal Solar Mirrors

1988 ◽  
Vol 121 ◽  
Author(s):  
Scott Reed ◽  
Carol Ashley
Keyword(s):  
Protective Coatings ◽  
Sol Gel ◽  
Protective Layer ◽  
Front Surface ◽  
Optical Measurements ◽  
Preliminary Evaluation ◽  
Environmental Testing ◽  
Specular Reflectance ◽  
Outdoor Environments ◽  
Sputter Deposited

ABSTRACTFront-surface metal mirrors were coated with a variety of sol-gel derived glass films for preliminary evaluation as protective coatings for silver. Optical measurements (hemispherical, diffuse and specular reflectance) were used to characterize changes in the mirror resulting from the application of the sol, subsequent processing, or environmental testing. The abrasion resistance of the films was determined on sol-gel coated silicon wafers per ASTM procedures. The mirrors were exposed to outdoor environments in Albuquerque, N.M., as well as accelerated testing in H2SO4, with periodic monitoring of optical properties. A two layer coating scheme, consisting of a thin primary protective layer of sputter deposited SiO2 followed by a thicker sol-gel overcoat, was also evaluated.

Protective coatings on copper prepared by sol–gel for industrial applications

1999 ◽  
Vol 122 (1) ◽  
pp. 14-17 ◽  
Author(s):  
W Boysen ◽  
A Frattini ◽  
N Pellegri ◽  
O de Sanctis
Keyword(s):  
Protective Coatings ◽  
Sol Gel ◽  
Industrial Applications

Microencapsulation: an emerging technique in the modern coating industry

RSC Advances ◽  
2016 ◽  
Vol 6 (108) ◽  
pp. 106964-106979 ◽  
Author(s):  
Kunal Wazarkar ◽  
Deepak Patil ◽  
Ajay Rane ◽  
Dinesh Balgude ◽  
Mukesh Kathalewar ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Protective Coatings ◽  
Sol Gel ◽  
Self Healing ◽  
The Past ◽  
Coating Industry

The protection of metal from corrosion is of great interest for which various methods have been implemented in the past such as organic–inorganic protective coatings, use of corrosion inhibitors, sol–gel coatings, self healing coatingsetc.

Sol–gel processing of hybrid nanocomposite protective coatings using experimental design

2013 ◽  
Vol 76 (1) ◽  
pp. 293-301 ◽  
Author(s):  
Akbar Hojjati Najafabadi ◽  
Reza Mozaffarinia ◽  
Hamed Rahimi ◽  
Reza Shoja Razavi ◽  
Ebrahim Paimozd
Keyword(s):  
Experimental Design ◽  
Protective Coatings ◽  
Sol Gel ◽  
Hybrid Nanocomposite ◽  
Gel Processing

Integration of Porous Silicon with Sol-Gel Derived Ceramic Films

2003 ◽  
Vol 768 ◽  
Author(s):  
S. Stolyarova ◽  
B. Malic ◽  
S. Javoric ◽  
A. El-Bahar ◽  
M. Kosec ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Protective Coatings ◽  
Sol Gel ◽  
Silicon Layer ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Porous Silicon Layer ◽  
Buffer Layers ◽  
Adhesive Interaction ◽  
Ceramic Films

AbstractDirect integration of sol-gel derived ceramic films with porous silicon, without buffer layers, has been demonstrated. The effects of ceramic type, solvent type, solution concentration, as well as, porous silicon layer thickness, porosity and preparation conditions, on the quality and microstructure of sol-gel films/porous silicon integrated systems have been studied. The following ceramic compositions have been applied to porous silicon as protective coatings: PZT (PbZr0.3Ti0.7O3), PLZT (Pb0.925La0.055Zr0.3Ti0.7O3), ZrO2, TiO2, with 2-methoxyethanol and 2-ethoxyethanol solvents, 0.5 and 0.1 M precursor solution concentrations. The LSCO (La0.5Sr0.5CO.3) water based sol-gels have been deposited for electroconductive purposes.The best compositions for integration, giving transparent, mirror-like, uniform ceramic films with fine morphology and strong adhesion, were found to be the TiO2 and ZrO2 as well as, the diluted (0.1 M) PZT (PbZr0.3Ti0.7O3) sol-gel precursors. Conductive LSCO sol-gel derived films showed improved wetting and stronger adhesive interaction with porous silicon, as compared to polished silicon wafers.

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