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Template-dependent hydrophobicity in mesoporous organosilica films

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Abstract
A template dependence of the degree of self-hydrophobization of methylene-bridged periodic mesoporous organosilica (PMO) films is reported. The film with the smallest pore size of 1.7 nm, templated by CTAC, results in higher hydrophilicity when compared to films with a pore size of 4.1 or 5.3 nm, templated by BrijL4 and BrijS10, respectively. Both the surface and the bulk hydrophilicity were evaluated by water contact angle measurements and water ellipsometric porosimetry and the same trends were observed. Additionally, we provide the first evidence for a steric hindrance of the self-hydrophobization process. We show that a partial template removal results in the methylene-to-methyl transformation being observed at a temperature as low as 200 degrees C, significantly lower than previously demonstrated. These results should be taken into account when PMO materials are considered for applications such as low-k dielectrics, membranes, catalyst and chromatographic supports, and drug carriers.
Keywords
Periodic mesoporous organosilica, Films, Self-hydrophobizaiton, Hydrophobicity, THIN-FILMS, SILICA, PMO

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Citation

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Chicago
Redzheb, Murad, Pascal Van Der Voort, and Silvia Armini. 2018. “Template-dependent Hydrophobicity in Mesoporous Organosilica Films.” Microporous and Mesoporous Materials 259: 111–115.
APA
Redzheb, M., Van Der Voort, P., & Armini, S. (2018). Template-dependent hydrophobicity in mesoporous organosilica films. MICROPOROUS AND MESOPOROUS MATERIALS, 259, 111–115.
Vancouver
1.
Redzheb M, Van Der Voort P, Armini S. Template-dependent hydrophobicity in mesoporous organosilica films. MICROPOROUS AND MESOPOROUS MATERIALS. 2018;259:111–5.
MLA
Redzheb, Murad, Pascal Van Der Voort, and Silvia Armini. “Template-dependent Hydrophobicity in Mesoporous Organosilica Films.” MICROPOROUS AND MESOPOROUS MATERIALS 259 (2018): 111–115. Print.
@article{8555193,
  abstract     = {A template dependence of the degree of self-hydrophobization of methylene-bridged periodic mesoporous organosilica (PMO) films is reported. The film with the smallest pore size of 1.7 nm, templated by CTAC, results in higher hydrophilicity when compared to films with a pore size of 4.1 or 5.3 nm, templated by BrijL4 and BrijS10, respectively. Both the surface and the bulk hydrophilicity were evaluated by water contact angle measurements and water ellipsometric porosimetry and the same trends were observed. Additionally, we provide the first evidence for a steric hindrance of the self-hydrophobization process. We show that a partial template removal results in the methylene-to-methyl transformation being observed at a temperature as low as 200 degrees C, significantly lower than previously demonstrated. These results should be taken into account when PMO materials are considered for applications such as low-k dielectrics, membranes, catalyst and chromatographic supports, and drug carriers.},
  author       = {Redzheb, Murad and Van Der Voort, Pascal and Armini, Silvia},
  issn         = {1387-1811},
  journal      = {MICROPOROUS AND MESOPOROUS MATERIALS},
  keyword      = {Periodic mesoporous organosilica,Films,Self-hydrophobizaiton,Hydrophobicity,THIN-FILMS,SILICA,PMO},
  language     = {eng},
  pages        = {111--115},
  title        = {Template-dependent hydrophobicity in mesoporous organosilica films},
  url          = {http://dx.doi.org/10.1016/j.micromeso.2017.10.005},
  volume       = {259},
  year         = {2018},
}

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