Abstract
Sol–gel silica hybrid coatings from acid and base catalyzed sols were examined. The sol precursors were tetraethyl orthosilicate (TEOS) and methyltriethoxysilane (MTES). It is generally accepted that the type of catalyst has a significant impact on the micro-structure of the resulting polysilicates. Weakly branched polymers are formed in acid catalyzed sols and highly branched, compact, particle like polymers are formed in base catalyzed sols. The mechanical and chemical properties of sol–gel derived silica coatings from acid and base catalyzed sols were studied as a function of the heat treatment temperature and time. Hardness and elastic modulus were measured by micro indentation measurements. The chemical composition of both types of coatings was characterized by X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (FTIR).
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Acknowledgments
This work is part of the Transregional Collaborative Research Centre SFB/TR4 “Process Chains for the Replication of Complex Optical Elements”. The support of the Deutsche Forschungsgemeinschaft (DFG) through the SFB/TR4 and the National Science Foundation through Grant Nos. OISE-0352377 and OISE-0128050 is gratefully acknowledged. The Los Alamos National Laboratory portion of this work was supported by the Department of Energy, Office of Basic Energy Sciences, and the Center for Integrated Nanotechnologies, a US Department of Energy, Office of Basic Energy Sciences user facility at Los Alamos National Laboratory (Contract DE-AC52-06NA25396) and Sandia National Laboratories (Contract DE-AC04-94AL85000).
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Mehner, A., Dong, J., Prenzel, T. et al. Mechanical and chemical properties of thick hybrid sol–gel silica coatings from acid and base catalyzed sols. J Sol-Gel Sci Technol 54, 355–362 (2010). https://doi.org/10.1007/s10971-010-2203-z
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DOI: https://doi.org/10.1007/s10971-010-2203-z