勃姆石
纳米颗粒
表征(材料科学)
化学工程
化学
表面改性
材料科学
纳米技术
矿物学
冶金
物理化学
铝
工程类
作者
Ajmal Zarinwall,Tassilo Waniek,Reza Saadat,Ulrike Braun,Heinz Stürm,Georg Garnweitner
出处
期刊:Langmuir
[American Chemical Society]
日期:2020-12-23
卷期号:37 (1): 171-179
被引量:34
标识
DOI:10.1021/acs.langmuir.0c02682
摘要
Hydrous boehmite (γ-AlOOH) nanoparticles (BNP) show great potential as nanoscale filler for the fabrication of fiber reinforced nanocomposite materials. Notably, the particle–matrix interaction has been demonstrated to be decisive for improving the matrix-dominant mechanical properties in the past years. Tailoring the surface properties of the nanofiller enables to selectively design the interaction and thus to exploit the benefits of the nanocomposite in an optimal way. Here, an extensive study is presented on the binding of (3-aminopropyl)triethoxysilane (APTES), a common silane surface modifier, on BNP in correlation to different process parameters (concentration, time, temperature, and pH). Furthermore, a comprehensive characterization of the modified BNP was performed by using elemental analysis (EA), thermogravimetric analysis (TGA) coupled with mass spectrometry (TGA-MS), and Kaiser's test (KT). The results show an increasing monolayer formation up to a complete surface coverage with rising APTES concentration, time, and temperature, resulting in a maximal grafting density of 1.3 molecules/nm2. Unspecific multilayer formation was solely observed under acidic conditions. Comparison of TGA-MS results with data recorded from EA, TGA, and KT verified that TGA-MS is a convenient and highly suitable method to elucidate the ligand binding in detail.
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