Hard coatings for CR-39 based on Al2O3–ZrO2 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) nanocomposites

Chantarachindawong, Rojcharin; Osotchan, Tanakorn; Chindaudom, Pongpan; Srikhirin, Toemsak

doi:10.1007/s10971-016-4006-3

Cited by 13 publications

(8 citation statements)

References 39 publications

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“…The pencil hardness of the hard coat is 3H. The scratch resistance and pencil hardness are very similar to hard coatings with similar thickness on CR-39 ® lens prepared based on the nanocomposite of Al 2 O 3 -ZrO 2 nanoparticles in a sol-gel matrix using 3-glycidoxypropyltrimethoxysilane (GPTMS) and TEOS by Chantarachindawong et al [5]. However, it seems that the addition of Al 2 O 3 -ZrO 2 nanoparticles does not show significant benefits for enhancing scratch resistance, e.g., pencil hardness.…”

Section: Scratch Resistancementioning

confidence: 73%

“…Sol-gel-derived transparent functional coatings have many industrial applications in recent years due to their superior optical [1][2][3][4][5], mechanical [6,7], electrical [8], and functional properties [4,9]. Kajioka et al achieved low sparkling in anti-glare spray coatings by controlling the size of polymerized species in silica sols with the transmittance haze as high as 12.38% [1].…”

Section: Introductionmentioning

confidence: 99%

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Industrial applications of sol–gel derived coatings

Shao

2022

J Sol-Gel Sci Technol

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Sol-gel derived coatings have many practical applications in different industries. In this paper, HI-GARD ® hard coat, multilayer antireflective coatings, and an anti-glare coating with organic particles are described. Optical and mechanical performances of these coatings are discussed in addition to adhesion properties. The HI-GARD ® hard coat was dip or spin coated from a sol by hydrolyzing alkoxysilanes with water in an acidic condition. The hard coat acts as a protective coating for optical lenses with excellent optical properties with a Bayer ratio of 4.8 and an adhesion of 5B. The multi-layer antireflective coatings were prepared by incorporating titanium oxide sol into the HI-GARD ® hard coat solution to obtain different layers by spin-coating with tunable refractive index. These two-layer or three-layer antireflective coatings increase transmittance by at least 3% compared to an uncoated glass substrate. Anti-glare coatings were spray-coated at room temperature on glass substrates by embedding cationic or anionic polystyrene particles in an acid-hydrolyzed silane sol. The anti-glare coating with organic particles can provide a significant glare reduction with a haze value of up to 13% for display surface without sparkling. In addition to these transparent coatings, non-transparent sol-gel derived coatings such as a sol-gel non-stick coating for cookware and bakeware, and two zinc-silicate protective coatings hydrolyzed from a silane with addition of zinc dusts for corrosion protection are also discussed briefly.

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Section: Scratch Resistancementioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Industrial applications of sol–gel derived coatings

Shao

2022

J Sol-Gel Sci Technol

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“…All the hybrid coatings deposited on the PC exhibited the pencil hardness of HB at thickness of 1.7 µm [5] and H for colloidal silica content of 36.0 vol.% with thickness within the range of 5 ± 0.5 µm [52]. The incorporation of Al 2 O 3 and ZrO 2 nanoparticles in the TEOS-GPTMS sol system improved the pencil hardness of coatings from 2H (pristine PC) to 2H at 5 µm coating thickness [55] and up to 3H with 19.6 µm coating thickness [56]. The pencil hardness in nanohybrid coatings made of titanium tetraisopropoxide and an acrylic modi ed silane was 3H at 7.2 µm thickness [33].…”

Section: Pencil Hardness Resultsmentioning

confidence: 99%

Producing of high-transparent antiscratch nanohybrid thin films on polycarbonate substrate

Kiomarsipour

Eshaghi

Ramazani

et al. 2022

Preprint

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In the present work, a new aqueous sol–gel procedure has been used for producing hard transparent organic–inorganic nanohybrid coatings on polycarbonate (PC) substrate for improving its optical and mechanical properties. Sol-gel thins films were prepared by mixing Si and Al aqueous precursors and applied them on the cold plasma treated PC substrate. TEOS, GPTMS and aluminum tri sec-butoxide were used as main precursors. In order to improve the adhesion strength onto polymer, PC substrates were treated by Dielectric Barrier Discharge (DBD) system being conducted at atmosphere pressure in open air. The effects of sol ratios, curing temperature and aging time on the prepared coatings properties were investigated. Chemical, structural, morphological, optical and mechanical characteristics of the samples were studied by ATR-FTIR, EDS, XRD, FE-SEM, TEM, UV/vis spectroscopy, pencil hardness and eraser scratch methods. The obtained results indicated that the water contact angle of PC (73.24°) decreased to 6.32° by 45 second plasma treatment due to added functional groups on the treated surfaces. All of the films showed higher optical transmittance (89%) than the raw PC (86%) that was stemmed from the lower refractive index of the prepared films. Films indicated good adhesion onto the plasma treated substrates (5B). The pencil hardness of the PC substrate (4B) improved to 3H (8 pencil grade increment) with just a single layer coating (about 200 nm thickness) due to the preparation of new hard structures of interlocked Si and Al atoms.

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“…The most common alkoxysilanes precursors, tetraethyl orthosilicate, TEOS and glycidoxypropyltrimethoxysilane, GPTMS are preferred due to their high thermal stability and controllable reactivity [12,28,29]. These precursors are used for synthesizing SiO 2 coatings that have high corrosion and wear resistance and superior adhesion behaviour on metallic surfaces [12,24,[29][30][31]. It is desired that the coatings that are applied to the material surfaces by sol-gel method and expected to increase resistance against corrosion should be thicker than 1µm.…”

Section: Introductionmentioning

confidence: 99%

Characterization of SiO2 sol-gel coated Ti6Al4V alloy obtained by using TEOS and GPTMS

et al. 2021

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Synthesis of silicon oxide (SiO2) via the sol-gel method and SiO2 coating ability on to Ti6Al4V alloy were investigated, in the novel study. Ti6Al4V alloy is the most used alloy in biomedical applications due to its many advantages. However, it has a minor disadvantage like releasing ions into the human body. In this study, the substrate material Ti6Al4V alloy samples were coated using the sol-gel method with alkoxysilane solutions (tetraethyl orthosilicate, TEOS; Si(OC2H5)4 and glycidoxypropyltrimethoxysilane, GPTMS; C9H20O5Si) containing the unit of prepared Si(OR)n after the surface preparations were made. The prepared solutions were examined using thermal analysis methods and the process temperatures to be applied to the coatings were determined according to the results of the analysis. Coated samples were subjected to aging, drying, and sintering processes at specified temperatures. The morphologies and structures of the samples were investigated by using a scanning electron microscope with energy-dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD). The sol-gel coating ability of the silicon oxide on the surface of the Ti6Al4V alloys has been discussed. The results demonstrate that cracks were observed in coating produced by TEOS precursor whereas the coatings used GPTMS precursor exhibited crack-free surface independently of dipping number. The crack formation tended to reduce with increasing dipping number of coatings produced by TEOS precursor. Distances between coating islets gradually became smaller as the number of dippings increased, and the continuity of the coatings increased. It has been observed that SiO2 coating layers produced with GPTMS are obtained in a more continuous and crack-free form than the layers produced with TEOS.

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Hard coatings for CR-39 based on Al2O3–ZrO2 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) nanocomposites

Cited by 13 publications

References 39 publications

Industrial applications of sol–gel derived coatings

Industrial applications of sol–gel derived coatings

Producing of high-transparent antiscratch nanohybrid thin films on polycarbonate substrate

Characterization of SiO2 sol-gel coated Ti6Al4V alloy obtained by using TEOS and GPTMS

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