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Periodic mesoporous organosilica films with a tunable steady-state mesophase

(2017) CHEMPHYSCHEM. 18(20). p.2846-2849
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Abstract
The mesophase formation in spin-coated periodic mesoporous organosilica (PMO) films aged at a controlled ambient humidity is investigated by time-resolved grazing-incidence small-angle X-ray scattering (GISAXS). The investigation demonstrates the existence of a tunable steady state in PMO spin-coated films. Thus, a film deposited at a relative humidity of 20% has a lamellar mesophase, whereas a subsequent increase to 70% leads to a phase transformation resulting in a P6(3)/mmc space group. On the other hand, an increase of the surfactant to organosilica molar ratio of between 0.26 and 0.31 results in films which at 70% humidity form a mix of 2D and 3D hexagonal phases. A further increase of the surfactant amount leads to films with a 2D hexagonal phase. Finally, the different mesophases observed as a function of the solution aging emphasize the importance of the degree of polycondensation of the organosilica oligomers.
Keywords
GISAXS, humidity, mesophases, organosilica, self-assembly, SILICA THIN-FILMS, OPTICALLY TRANSPARENT, PLATES, PMO

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Chicago
Redzheb, Murad, Sigrid Bernstorff, Barbara Sartori, Pascal Van Der Voort, and Silvia Armini. 2017. “Periodic Mesoporous Organosilica Films with a Tunable Steady-state Mesophase.” Chemphyschem 18 (20): 2846–2849.
APA
Redzheb, M., Bernstorff, S., Sartori, B., Van Der Voort, P., & Armini, S. (2017). Periodic mesoporous organosilica films with a tunable steady-state mesophase. CHEMPHYSCHEM, 18(20), 2846–2849.
Vancouver
1.
Redzheb M, Bernstorff S, Sartori B, Van Der Voort P, Armini S. Periodic mesoporous organosilica films with a tunable steady-state mesophase. CHEMPHYSCHEM. 2017;18(20):2846–9.
MLA
Redzheb, Murad, Sigrid Bernstorff, Barbara Sartori, et al. “Periodic Mesoporous Organosilica Films with a Tunable Steady-state Mesophase.” CHEMPHYSCHEM 18.20 (2017): 2846–2849. Print.
@article{8537177,
  abstract     = {The mesophase formation in spin-coated periodic mesoporous organosilica (PMO) films aged at a controlled ambient humidity is investigated by time-resolved grazing-incidence small-angle X-ray scattering (GISAXS). The investigation demonstrates the existence of a tunable steady state in PMO spin-coated films. Thus, a film deposited at a relative humidity of 20\% has a lamellar mesophase, whereas a subsequent increase to 70\% leads to a phase transformation resulting in a P6(3)/mmc space group. On the other hand, an increase of the surfactant to organosilica molar ratio of between 0.26 and 0.31 results in films which at 70\% humidity form a mix of 2D and 3D hexagonal phases. A further increase of the surfactant amount leads to films with a 2D hexagonal phase. Finally, the different mesophases observed as a function of the solution aging emphasize the importance of the degree of polycondensation of the organosilica oligomers.},
  author       = {Redzheb, Murad and Bernstorff, Sigrid and Sartori, Barbara and Van Der Voort, Pascal and Armini, Silvia},
  issn         = {1439-4235},
  journal      = {CHEMPHYSCHEM},
  keyword      = {GISAXS,humidity,mesophases,organosilica,self-assembly,SILICA THIN-FILMS,OPTICALLY TRANSPARENT,PLATES,PMO},
  language     = {eng},
  number       = {20},
  pages        = {2846--2849},
  title        = {Periodic mesoporous organosilica films with a tunable steady-state mesophase},
  url          = {http://dx.doi.org/10.1002/cphc.201700795},
  volume       = {18},
  year         = {2017},
}

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