Full
LI Fangxian (1979-), male, Ph.D., Associate Researcher E-mail: msfxli@scut.edu.cn
Outline
Yolk-shell structure hollow silica nanospheres were prepared with TEOS as a silica precursor and polystyrene sphere as a template by a continuous hard-template wrapping synthesis method and subsequent high temperature calcining. The structure, morphology and properties of the as-synthesized products were characterized by zeta potential analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption isotherm and thermal conductivity analysis. The thermal insulation properties of acrylate coating with yolk-shell structure hollow silica nanospheres were investigated. The results show yolk-shell structure hollow silica nanospheres with 20-290 nm layer space have a petal-like morphology. The thermal conductivity is 0.0500-0.0650 W·m-1·K-1, which increases with the increase of inner core particle size. The incorporation of yolk-shell structure hollow silica nanospheres into acrylate coating can effectively reduce the thermal conductivity of the coating, which can be reduced by more than 70% at the incorporation content of 8%. Compared to single shell hollow silica nanospheres, yolk-shell structure hollow silica nanospheres have a decreased thermal conductivity of the coating and a better thermal insulation performance.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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