Santa Barbara Amorphous-15 Explained

SBA-15, an acronym for Santa Barbara Amorphous-15, is a silica-based ordered mesoporous material that was first synthesized by researchers at the university of California Santa Barbra in 1998.[1] This material proved important for scientists in various fields such as material sciences,[2] drug delivery,[3] catalysis,[4] fuel cells[5] and many other due to its desirable properties and ease of production.

Synthesis procedure

The procedure is a typical Liquid-Crystal templating that consists of three steps:

  1. Solution preparation — Pluronic P123 is dissolved in an acidic solution of water at specific molar ratios[6] and the silica precursor typically TEOS or TMOS (sometimes EGMS[7]) is added and mixed in for some time.
  2. Hydrothermal treatment — The solution is sealed in a container and subjected to a temperature T1 for about 24 hours and then a higher temp T2 for 48 hours.
  3. Washing and calcination — The gel obtained from the previous step is washed with water and ethanol under centrifuging, and finally calcinated at about 550 °C for 6 hours.

Structure

The interest in SBA-15 comes from the fact that its mostly mesopoures – meaning the pores are in the range of 2 nm to 50 nm according to the IUPAC definition[8] and the fact that these pores have a well defined structure that is cylindrical shape in hexagonal ordering with their relatively thick pore walls which gives thermal stability.[9]

The sorption isotherms of these materials, demonstrate typical hysteric behavior, which is still under discussion for its causes.

TEM

The transmission electron microscopy of the sample shows the cylindrical pores but also highlights then fact that the pores of this material exhibit geometric deformations.

SAXS

The small-angle X-ray scattering pattern shows typical Bragg peaks to the hexagonal structure of the material. The peak positions, is directly related to the lattice parameter.

qhk=

4\pi
a\sqrt{3
} \sqrt

where h and k are the miller indices.

Notes and References

  1. Zhao . Dongyuan . Feng . Jianglin . Huo . Qisheng . Melosh . Nicholas . Fredrickson . Glenn H. . Chmelka . Bradley F. . Stucky . Galen D. . 1998-01-23 . Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 Angstrom Pores . Science . en . 279 . 5350 . 548–552 . 10.1126/science.279.5350.548 . 9438845 . 0036-8075.
  2. Haidar . Ali F. . Belet . Artium . Goderis . Bart . Léonard . Alexandre F. . Gommes . Cedric J. . 2024-08-20 . Small-Angle Scattering Indicates Equilibrium Instead of Metastable Capillary Condensation in SBA-15 Mesoporous Silica . Langmuir . en . 40 . 33 . 17444–17453 . 10.1021/acs.langmuir.4c01609 . 39110604 . 2268/321325 . 0743-7463. free .
  3. Song . S.-W. . Hidajat . K. . Kawi . S. . 2005-10-01 . Functionalized SBA-15 Materials as Carriers for Controlled Drug Delivery: Influence of Surface Properties on Matrix−Drug Interactions . Langmuir . en . 21 . 21 . 9568–9575 . 10.1021/la051167e . 16207037 . 0743-7463.
  4. Lai . Yuan T. . Chen . Tse C. . Lan . Yi K. . Chen . Bo S. . You . Jiann H. . Yang . Chia M. . Lai . Nien C. . Wu . Jia H. . Chen . Ching S. . 2014-11-07 . Pt/SBA-15 as a Highly Efficient Catalyst for Catalytic Toluene Oxidation . ACS Catalysis . en . 4 . 11 . 3824–3836 . 10.1021/cs500733j . 2155-5435.
  5. Chen . Taipu . Chen . Lei . Zhao . Yutong . Hao . Jinkai . Shao . Zhigang . July 2024 . Organic phosphonic acid modified SBA-15 assisted enhanced high-temperature proton exchange membrane fuel cell performance of polybenzimidazole membranes . Journal of Membrane Science . en . 707 . 122948 . 10.1016/j.memsci.2024.122948.
  6. Cao . Liang . Man . Tiffany . Kruk . Michal . 2009-03-24 . Synthesis of Ultra-Large-Pore SBA-15 Silica with Two-Dimensional Hexagonal Structure Using Triisopropylbenzene As Micelle Expander . Chemistry of Materials . en . 21 . 6 . 1144–1153 . 10.1021/cm8012733 . 0897-4756.
  7. Web site: Belet . Artium . Léonard . Alexandre . Heinrichs . Benoit . 2024-05-13 . Small-angle scattering and sorption data in SBA-15 materials . 2024-05-13 . dataverse . 10.58119/ULG/L8PJJK.
  8. Thommes . Matthias . Kaneko . Katsumi . Neimark . Alexander V. . Olivier . James P. . Rodriguez-Reinoso . Francisco . Rouquerol . Jean . Sing . Kenneth S.W. . 2015-10-01 . Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report) . Pure and Applied Chemistry . en . 87 . 9–10 . 1051–1069 . 10.1515/pac-2014-1117 . 1365-3075.
  9. Chaudhary . Vasu . Sharma . Sweta . June 2017 . An overview of ordered mesoporous material SBA-15: synthesis, functionalization and application in oxidation reactions . Journal of Porous Materials . en . 24 . 3 . 741–749 . 10.1007/s10934-016-0311-z . 1380-2224.

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