TY - JOUR
T1 - Gas Phase Modification of Silica Nanoparticles in a Fluidized Bed
T2 - Tailored Deposition of Aminopropylsiloxane
AU - Mahtabani, Amirhossein
AU - La Zara, Damiano
AU - Anyszka, Rafał
AU - He, Xiaozhen
AU - Paajanen, Mika
AU - Van Ommen, J. Ruud
AU - Dierkes, Wilma
AU - Blume, Anke
N1 - Funding Information:
This project has received funding from the European Union’s Horizon 2020 research and innovation program under the name of GRIDABLE and the grant agreement No. 720858.
Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society.
PY - 2021/4/6
Y1 - 2021/4/6
N2 - Functionalized nanoparticles have various applications, for which grafting of a chemical moiety onto the surface to induce/improve certain properties is needed. When incorporated in polymeric matrices, for instance, the modified nanoparticles can alter the interfacial characteristics leading to improvements ofthe macroscopic properties of the nanocomposites. The extent of these improvements is highly dependent on the thickness, morphology and conformity of the grafted layer. However, the common liquid-phase modification methods provide limited control over these factors. A novel gas-phase modification process was utilized, with 3-aminopropyltriethoxysilane (APTES) as precursor, to chemically deposit amino-terminated organic layers on fumed silica nanoparticles in a fluidized bed. A self-limiting surface saturation was achieved when the reaction was done at 200 °C. With this self-limiting feature, we were able to graft multiple layers of aminopropylsiloxane (APS) onto the silica nanoparticles using water as the coreactant. The feasibility of this process was analyzed using thermogravimetric analysis (TGA), diffuse reflectance IR Fourier transform spectroscopy (DRIFTS), X-ray photoelectron spectroscopy (XPS), and elemental analysis (EA). By altering the number of APTES/water cycles, it was possible to control the thickness and conformity of the deposited aminopropylsiloxane layer. This novel approach allows to engineer the surface of nanoparticles, by introducing versatile functionalized layers in a controlled manner.
AB - Functionalized nanoparticles have various applications, for which grafting of a chemical moiety onto the surface to induce/improve certain properties is needed. When incorporated in polymeric matrices, for instance, the modified nanoparticles can alter the interfacial characteristics leading to improvements ofthe macroscopic properties of the nanocomposites. The extent of these improvements is highly dependent on the thickness, morphology and conformity of the grafted layer. However, the common liquid-phase modification methods provide limited control over these factors. A novel gas-phase modification process was utilized, with 3-aminopropyltriethoxysilane (APTES) as precursor, to chemically deposit amino-terminated organic layers on fumed silica nanoparticles in a fluidized bed. A self-limiting surface saturation was achieved when the reaction was done at 200 °C. With this self-limiting feature, we were able to graft multiple layers of aminopropylsiloxane (APS) onto the silica nanoparticles using water as the coreactant. The feasibility of this process was analyzed using thermogravimetric analysis (TGA), diffuse reflectance IR Fourier transform spectroscopy (DRIFTS), X-ray photoelectron spectroscopy (XPS), and elemental analysis (EA). By altering the number of APTES/water cycles, it was possible to control the thickness and conformity of the deposited aminopropylsiloxane layer. This novel approach allows to engineer the surface of nanoparticles, by introducing versatile functionalized layers in a controlled manner.
KW - UT-Hybrid-D
UR - http://www.scopus.com/inward/record.url?scp=85105035760&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.0c03647
DO - 10.1021/acs.langmuir.0c03647
M3 - Article
C2 - 33823592
AN - SCOPUS:85105035760
SN - 0743-7463
VL - 37
SP - 4481
EP - 4492
JO - Langmuir
JF - Langmuir
IS - 15
ER -