| WANG Ping-mei,HE Mei-ying,JIA Xin-li,XIAO Pei-wen,LUO Jian-hui,JIANG Bo.Synthesis of Raspberry-like SiO2-TiO2 Nanoparticles and the Application in Optical Films[J],51(6):374-381 |
| Synthesis of Raspberry-like SiO2-TiO2 Nanoparticles and the Application in Optical Films |
| |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.06.036 |
| KeyWord:raspberry-like Stöber method sol-gel method optical coatings self-cleaning mechanical robust |
| Author | Institution |
| WANG Ping-mei |
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing , China;Key Laboratory of Nano Chemistry KLNC, CNPC, Beijing , China |
| HE Mei-ying |
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu , China |
| JIA Xin-li |
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu , China |
| XIAO Pei-wen |
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing , China;Key Laboratory of Nano Chemistry KLNC, CNPC, Beijing , China |
| LUO Jian-hui |
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing , China;Key Laboratory of Nano Chemistry KLNC, CNPC, Beijing , China |
| JIANG Bo |
Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu , China |
|
| Hits: |
| Download times: |
| Abstract: |
| It is an novel method to synthesis SiO2-TiO2 composite nanoparticles with raspberry-like structure, which constructed multifunctional films with properties of high light transmittance, anti-fogging, photocatalytic self-cleaning, as well as mechanical robustness. Since titania is of good performance in photocatalytic self-cleaning, it is widely used in the preparation of functional surface coatings. However, dense titania has high refractive index and nano-titania is easy to agglomerate, resulting in poor optical transmission properties and photocatalytic self-cleaning effective of surface coatings prepared with titania. To solve this problem, a composite nanostructure was created to improve the dispersing stability and photocatalytic effective of small titania nanospheres in optical films. In this paper, SiO2 nanospheres with sizes of 70 nm and 140 nm were synthesized through Stöber method, and 5 nm TiO2 nanospheres were prepared under acid catalysis. SiO2 nanospheres were modified by hexamethyldisilane (HMDS) and then decorated by (3-aminopropyl) triethoxysilane (APTES, or KH550) to graft amino groups on surfaces. TiO2 nanospheres were modified by γ-glycidoxy-propyltrimethoxysilane (GLYMO, or KH560) to graft epoxy groups on surfaces. followed by silica-titania composite nanoparticles with raspberry-like morphology were fabricated via the assembly of silica nanospheres and hydrophilic titania nanoparticles through chemical interactions between amino groups and epoxy groups. Then, optical films were prepared through dip-coating met hod by using raspberry-like SiO2-TiO2 nanoparticles as building blocks. By wrapping around SiO2 nanospheres, small TiO2 spheres can be uniformly distributed in the film without agglomeration, thus more chemical activity can be retained. Characterization instruments such as DLS, TEM, EDX, XRD, UV-vis spectrophotometer, Infrared spectrometer were involved to analyze the structure, morphology, properties and performances of raspberry-like particles and optical films they built. As the results, raspberry-like morphology was successfully prepared since SiO2 nanospheres with larger size were covered evenly by smaller TiO2 nanospheres. The optical films built by SiO2-TiO2 nanoparticles have a high transmittance, which is more than 90%, thus the light transmission of substrates was largely reserved. Organic contaminants on the films can be totally degraded within 120 min under UV illumination. The water contact angles of films were as low as 2.68°, which means the films were superhydrophilic, water drops can spread rapidly on the surface, thus they have a good performance in anti-fogging. Furthermore, films exhibited a strong adhesion to the substrates and a good friction resistance, transmittance of films showed a high stability after abrasion-resistant testing, only 1.0% decrease on average. Briefly, raspberry-like SiO2-TiO2 nanoparticles were synthesized successfully through surface-connection between SiO2 and TiO2 nanospheres and as building blocks to form optical films which can provide a high light transmittance, photocatalytic self-cleaning property for the substrates, and also have a good performance in mechanical robustness, therefore, these films can perform well in outdoor application with harsh conditions. Also, in this work, an advanced preparation method of SiO2-TiO2 hybrid films was created, the whole preparation process was carried out under mild conditions, which avoids the influences of high temperature calcination for template removal and chemical corrosion on the performance of optical substrates, as well as high energy consumption and environmental pollution, which is in line with the concept of environmentally friendly and sustainable development. |
| Close |
|
|
|