Mesoporous Hybrid Organosilica Materials Functionalized with Biphenyl Moiety
Eduardo R. Magdaluyo, Jr.1, Raymond V. Rivera Virtudazo2,
Leonard P. dela Cruz3, Emily V. Castriciones3,4 , and Herman D. Mendoza1
1Department of Mining, Metallurgical and Materials Engineering
University of the Philippines, 1101 Diliman, Quezon City, Philippines
2Department of Ceramic Engineering
Mariano Marcos State University, Batac, Ilocos Norte, Philippines
3Natural Science Research Institute, University of the Philippines,
1101 Diliman, Quezon City, Philippines
4Inorganic Synthesis and Computational Research Laboratory,
Institute of Chemistry University of the Philippines, 1101 Diliman, Quezon City, Philippines
The synthesis of well-defined structures of inorganic silica framework systems functionalized with organic moiety renders these systems versatile in designing new materials. We have obtained in our laboratories a mesoporous hybrid organosilica material incorporating a biphenyl moiety from the condensation of 4,4’-bis(triethoxysilyl) biphenyl monomer with tetraethoxysilane and 1,2-bis(triethoxysilyl)ethane in basic medium. The polymerization was carried out via surfactant–templated method. Infrared spectroscopic analyses showed that the biphenyl moiety was covalently integrated in the polymeric organosilica structure, and X-ray diffraction investigation confirmed the reflection of two-dimensional hexagonal symmetry lattice. The incorporation of this organic moiety is limited by the proportion of 1,2-bis(triethoxysilyl)ethane. The interplanar spacing was decreased with increasing amount of organosilane incorporation. Morphology of the hybrid xerogel material was in the form of agglomerated particles composed of rope-like orientation. Our results indicated that by manipulating the synthesis conditions, it is possible to tailor and tune the structural and textural properties of the obtained mesoporous hybrid material, allowing some possible flexibility in their design for specific application.
The new developments in the field of hybrid materials include the synthesis of well-ordered structures of inorganic silica incorporating an organic moiety in the framework. The mesoporous organosilica with pore diameters from 20 to 500 Å have a distinct advantage over other mesoporous silica materials (Inagaki 2003; Yamamoto et al. 2003; Hatton et al. 2005). The integration of organic functionality within the inorganic porous hosts expanded their applications. The functionalization represents a useful tool to fine-tune hybrid materials for specific physical, chemical, and surface properties as well as better thermal and hydrothermal stabilities for a wider range of applications in catalysis, adsorption, separation science, sensing technology, and nanoelectronics (Asefa et al. 1999; Davis 2000; Burleigh et al. 2001; 2003; Baleizao et al. 2003).
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