2氣凝膠,SAXS,光散射"/> 3的SiO2氣凝膠。運(yùn)用小角X射線散射(small-angle X-ray scattering,SAXS)分析SiO2氣凝膠的微結(jié)構(gòu),并測(cè)量各密度樣品635nm波長(zhǎng)的90°方向光散射率,針對(duì)不同密度樣品分別研究了光散射率與微結(jié)構(gòu)的關(guān)系。研究表明：隨著初始溶劑用量的增加,密度(r)、質(zhì)量分形維數(shù)(Dm)隨之減少,而初級(jí)粒子(a)與次級(jí)粒子(d)尺寸在增大,這可能是在初始溶劑用量增加情況下,因?yàn)樵蟃MOS初始濃度降低,導(dǎo)致相分離方式由成核主導(dǎo)向生長(zhǎng)主導(dǎo)轉(zhuǎn)變；此外分別從初級(jí)粒子、次級(jí)粒子的角度考慮,對(duì)散射率進(jìn)行分析得出635nm光與氣凝膠的相互作用主要是與次級(jí)粒子結(jié)構(gòu)的不相干Rayleigh散射,且光散射的數(shù)值與二級(jí)結(jié)構(gòu)內(nèi)的體分形維數(shù)、初級(jí)粒子尺寸,次級(jí)粒子尺寸均有關(guān)。"/>

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TMOS硅源一步法制備SiO2氣凝膠微結(jié)構(gòu)與光散射率的關(guān)系研究
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同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室,同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室,同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室,同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室,同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室,同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室,同濟(jì)大學(xué) 上海市特殊人工微結(jié)構(gòu)材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室

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國(guó)家重點(diǎn)研發(fā)計(jì)劃“納米科技”重點(diǎn)專(zhuān)項(xiàng)(2017YFA0204600)；國(guó)家自然科學(xué)基金(51472182)


Relationship between Microstructure and Light Scattering of TMOS–Derived SiO2 Aerogel via One-Step Sol-Gel Method
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Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure and Technology,Tongji University

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    摘要:

    采用溶膠凝膠法,以正硅酸甲脂(tetramethyl orthosilicate,TMOS)為硅源、甲醇為溶劑,利用堿催化“一步法”,結(jié)合乙醇超臨界干燥制備了密度分別是95、110、135和165mg/cm3的SiO2氣凝膠。運(yùn)用小角X射線散射(small-angle X-ray scattering,SAXS)分析SiO2氣凝膠的微結(jié)構(gòu),并測(cè)量各密度樣品635nm波長(zhǎng)的90°方向光散射率,針對(duì)不同密度樣品分別研究了光散射率與微結(jié)構(gòu)的關(guān)系。研究表明：隨著初始溶劑用量的增加,密度(r)、質(zhì)量分形維數(shù)(Dm)隨之減少,而初級(jí)粒子(a)與次級(jí)粒子(d)尺寸在增大,這可能是在初始溶劑用量增加情況下,因?yàn)樵蟃MOS初始濃度降低,導(dǎo)致相分離方式由成核主導(dǎo)向生長(zhǎng)主導(dǎo)轉(zhuǎn)變；此外分別從初級(jí)粒子、次級(jí)粒子的角度考慮,對(duì)散射率進(jìn)行分析得出635nm光與氣凝膠的相互作用主要是與次級(jí)粒子結(jié)構(gòu)的不相干Rayleigh散射,且光散射的數(shù)值與二級(jí)結(jié)構(gòu)內(nèi)的體分形維數(shù)、初級(jí)粒子尺寸,次級(jí)粒子尺寸均有關(guān)。

    Abstract:

    The SiO2 aerogel samples were obtained via one-step sol-gel route and ethanol supercritical dried method. A silicon oxide precursor, tetramethyl orthosilicate (TMOS) was dissolved in methanol and hydrolyzed. By using ammonia as a catalyst and methanol as solvent, SiO2 aerogels with the density of 95, 110, 135, 165 mg/cm3 were prepared. Combining with 635 nm wavelength laser and 90° direction scattering of samples, the microstructure-property relationship was studied by analyzing the results of small angle x-ray scattering. In this paper, with the increase of initial solvent, density (r ) and mass fractal dimension (Dm) decreased, while the primary particles (a) and secondary particles (d) increased. The reason may be that the phase separation is changed from the nucleation-dominated to the growth-dominated for initial concentration of TMOS decreased. In addition, the primary or secondary particles were assumed as the scatterer. The results are analyzed, respectively. It is revealed that interaction between the aerogels and the light is irrelevant Rayleigh scattering, and the main scattering took place on the secondary particles. The scattering is determined by the secondary structure, including the fractal dimension (D), the size of primary particles (a), and the size of secondary particles (d).

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劉明放,杜艾,吳帥,孫巍,李鐵民,沈軍,周斌. TMOS硅源一步法制備SiO2氣凝膠微結(jié)構(gòu)與光散射率的關(guān)系研究[J].稀有金屬材料與工程,2018,47(S2):140~144.[Mingfang Liu, Du Ai, Wu Shuai, Sun Wei, Li Tiemin, Shen Jun, Zhou Bin. Relationship between Microstructure and Light Scattering of TMOS–Derived SiO2 Aerogel via One-Step Sol-Gel Method[J]. Rare Metal Materials and Engineering,2018,47(S2):140~144.]
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  • 收稿日期:2017-12-05
  • 最后修改日期:2017-12-05
  • 錄用日期:2018-02-01
  • 在線發(fā)布日期: 2018-11-01
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