Project's information
| Project's title | Research on the fabrication of various inorganic nano particles and additives for application in advanced coating technologies |
| Project’s code | TĐVLTT01/21-23 |
| Research hosting institution | Institute for Tropical Technology |
| Project leader’s name | Prof. Dr. Tran Dai Lam |
| Project duration | 01/01/2021 - 31/12/2023 |
| Project’s budget | 9,500 million VND |
| Classify | Grade A |
| Goal and objectives of the project | - To successfully fabricate some nano-sized additives for advanced coatings: corrosion protection, antimicrobial, solar heat reflection, waterproofing, and extreme weather resistance. |
| Main results | - Theoretical results: + Some nano additives such as ZnO, Cu2O, ZrO2, TiO2, and zeolite@Ag have been successfully synthesized with typical surface-active agents like TOPO, OLA, OA. The results show that these nano additives have particle sizes below 50 nm and are relatively uniform. The coupling efficiency of organic functional groups on the surface is over 90%, with an organic content ranging from 15-28%. These nano additives disperse well and remain stable in some organic solvents even after 12 months, demonstrating high antibacterial activity. + For thermal reflective, waterproof, and weather-resistant paint systems, several nano additives like BaSO4, TiO2, ZrO2, CaSiO3, CaCO3, CaSO4, nanocarrier@Ce3+ with SiO2 Fe2O3, ZnO, CeO2-SiO2, CeO2-Fe2O3, and CeO2-Fe2O3-SiO2 have been researched and manufactured under different experimental conditions with various surface-active agents suitable for solvent-based and water-based paints. The results indicate that the nano additives have small and relatively uniform particle sizes (15-40 nm) and an organic content of about 15-20%. Phase transfer has been successfully achieved through methods such as ligand exchange, using amphiphilic polymers, or silane modification to adapt the surface properties of the additives for water-based paints. + Some organic additives such as CNT, nanoclay, nanoclay/metal oxide, GO, and SiO2-polypyrrole nanocomposites have been successfully synthesized and modified for use in corrosion-resistant protective coatings. Test results for the corrosion protection capability of CT3 steel composite GO-PPy show that the material reduces the corrosion current density and shifts the potential towards the positive direction. Nano SiO2 with Ce3+ corrosion inhibition properties has been tested for dispersion in PU coatings and coatings containing nano SiO2@Ce3+ have excellent UV absorption capabilities, while SiO2/PPy nanocomposites enhance corrosion resistance for epoxy films. + Nano-sized particles of SiO2, Al2O3, CeO2, and a CeO2-TiO2 hybrid have been successfully manufactured for inorganic coatings. The results show that these nano additives have an average particle size of 50-100 nm and a large specific surface area, making them suitable for incorporation into inorganic coatings. + Electrode sensors have been successfully manufactured using 3D printing technology, using graphene-based ink and some conductive metal nanoparticles such as AuNPs, AgNPs, and CuNPs. Two-electrode resistance measurement systems with IC 555 and IC LM393 have been successfully developed to provide early warning of corrosion events, especially in highly corrosive tropical and marine environments. Test results for total resistance measurement in humid and corrosive gas environments show that Ag material sensors with serrated electrode structures are ideal for designing and manufacturing humidity sensors that determine water film formation by measuring total resistance. - Applied results: + Some additives have been tested and compared for their effectiveness with commercial additives in anti-fouling and microbially induced corrosion protective coatings produced by Project component 2 (Hợp phần 2). The results show that certain properties of the paint films have been improved and are somewhat superior to commercial additives, such as adhesion, impact resistance, and resistance to sand erosion when supplemented with ZrO2 and TiO2 additives. + Nano additives like TiO2, BaSO4, ZrO2, CaSiO3, and CaSO4 have been tested in coatings produced by Project component 3 (Hợp phần 3). Test results show that nano TiO2 and ZrO2 provide promising results and high applicability. Specifically, coatings containing nano TiO2 meet the requirements for cold-heat resistance of exterior wall paint (> 50 cycles), and the reflectivity of the paint film increases significantly, achieving higher efficiency compared to control samples using commercial additives. Specifically, achieving 95.78% is higher by 4.78% compared to the commercial paint membrane and 6% higher than the paint membrane without nano additives. In the solvent-based paint system, the ZrO2-containing paint system has better heat resistance compared to the paint system containing commercial additives: the paint system reduced the surface temperature of the concrete panel by up to 8°C and the air temperature in the chamber by over 4°C. The temperature difference between the surface and air temperature of the paint system containing HP1 additives and the commercial paint system is 1.75°C and 1.5°C, respectively. + Some nano additives like: SiO2, Al2O3, CeO2 have bên tested by by Project component 5 (Hợp phần 5). The results show that nano-silica in the (ZnNi-nanosilica)3/Chromium(III) coating system has enhanced the corrosion protection capabilities of the plating layer and does not differ significantly from coatings containing commercial nano additives. The Al-Mg/epoxy-nanocomposite coating containing nano Al2O3 has higher abrasion resistance and good corrosion protection capabilities compared to coatings containing nano SiO2. Furthermore, it does not differ significantly from coatings with commercial nano additives. Additionally, after undergoing corrosion tests, salt spray tests, and exposure to natural environments in Quang Ninh and Nha Trang, it has been shown that the Al-Mg/epoxy-nano Al2O3 coating provides excellent corrosion protection for steel substrates in both marine and atmospheric conditions. |
| Novelty and actuality and scientific meaningfulness of the results | - Some nano additives have been successfully synthesized in-situ using surface-active agents such as TOPO, OLA, OA. These nano additives have particle sizes ≤ 50 nm and relatively uniform distribution. The grafting efficiency of organic functional groups on the surface is > 90% with an organic content ranging from 5-25%. These nano additives disperse well and remain stable in organic solvents, even after 12 months. |
| Products of the project | - Scientific papers: 05 papers in international journals (03 papers in SCIE and 02 papers in Scopus) and 06 papers in national journals |
| Recommendations | - Research on the synthesis and surface modification of nano additives for advanced functional coatings is of great scientific significance and has significant potential applications in practice. This research direction aligns with the increasing societal demand for protective coatings for materials, civil infrastructure, and defense in the complex and changing climate conditions of today. It also helps avoid substantial economic losses and minimizes the risk of environmental pollution during the experimental process. Therefore, we respectfully propose that the Vietnam Academy of Science and Technology take an interest in developing this research direction into one of the VAST's strengths. We hope to continue researching, developing, and producing products on a pilot scale and commercializing them in the near future. |
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