Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation
The present work contributes to elucidating the differences between silica gels obtained by low doses ultrasonic activation, and those obtained by the conventional method, termed as classical sol gel. Silica matrices were produced by sol-gel synthesis process, assisted and non-assisted by an ultraso...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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University of Novi Sad
2009-06-01
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| Series: | Processing and Application of Ceramics |
| Subjects: | |
| Online Access: | http://www.tf.uns.ac.rs/publikacije/PAC/pdf/45%20PAC%2004.pdf |
| _version_ | 1818017766637043712 |
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| author | Václav Štengl Claudia Ionescu Noémi Kinga Székely Dan Nicoara Corina Enache Mihaela Popovici Ioan Sora László Almásy Jan Subrt George Gustav Savii Cecilia Savii Dana Susan Resiga |
| author_facet | Václav Štengl Claudia Ionescu Noémi Kinga Székely Dan Nicoara Corina Enache Mihaela Popovici Ioan Sora László Almásy Jan Subrt George Gustav Savii Cecilia Savii Dana Susan Resiga |
| author_sort | Václav Štengl |
| collection | DOAJ |
| description | The present work contributes to elucidating the differences between silica gels obtained by low doses ultrasonic activation, and those obtained by the conventional method, termed as classical sol gel. Silica matrices were produced by sol-gel synthesis process, assisted and non-assisted by an ultrasonic fi eld, and subsequently characterized by various methods. Nitrogen adsorption and small-angle neutron scattering (SANS) measurements provided texture and microstructure of the dried gels. The adsorption results show that the sample sonicated for 2 hours presents the most ordered microstructure, characterized by pore shape close to spherical and the narrowest size distribution – about 90 % of the pores for this sample fall into the mesopore range (2–50 nm). SANS data reveal the formation of primary structural units of sizes around 1.5–2 nm which are small linear or branched polymeric species of roughly spherical shape and with rough surface. They are generated in the very early stage of sol gel process, as a result of hydrolysis and condensation reactions. The aggregated primary units form the secondary porous structure which can be described as a rough surface with fractal dimension above 2. The best porosity characteristics were obtained for the sample activated for 2 hours, indicating the optimal doses of sonication in the present conditions. Our results demonstrate the possibility of tailoring the pore size distribution using a low power ultrasonic bath. |
| first_indexed | 2024-04-14T07:31:14Z |
| format | Article |
| id | doaj.art-8e0aea3f3d534011ad701a7a46101366 |
| institution | Directory Open Access Journal |
| issn | 1820-6131 |
| language | English |
| last_indexed | 2024-04-14T07:31:14Z |
| publishDate | 2009-06-01 |
| publisher | University of Novi Sad |
| record_format | Article |
| series | Processing and Application of Ceramics |
| spelling | doaj.art-8e0aea3f3d534011ad701a7a461013662022-12-22T02:05:52ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312009-06-0131-25964Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activationVáclav ŠtenglClaudia IonescuNoémi Kinga SzékelyDan NicoaraCorina EnacheMihaela PopoviciIoan SoraLászló AlmásyJan SubrtGeorge Gustav SaviiCecilia SaviiDana Susan ResigaThe present work contributes to elucidating the differences between silica gels obtained by low doses ultrasonic activation, and those obtained by the conventional method, termed as classical sol gel. Silica matrices were produced by sol-gel synthesis process, assisted and non-assisted by an ultrasonic fi eld, and subsequently characterized by various methods. Nitrogen adsorption and small-angle neutron scattering (SANS) measurements provided texture and microstructure of the dried gels. The adsorption results show that the sample sonicated for 2 hours presents the most ordered microstructure, characterized by pore shape close to spherical and the narrowest size distribution – about 90 % of the pores for this sample fall into the mesopore range (2–50 nm). SANS data reveal the formation of primary structural units of sizes around 1.5–2 nm which are small linear or branched polymeric species of roughly spherical shape and with rough surface. They are generated in the very early stage of sol gel process, as a result of hydrolysis and condensation reactions. The aggregated primary units form the secondary porous structure which can be described as a rough surface with fractal dimension above 2. The best porosity characteristics were obtained for the sample activated for 2 hours, indicating the optimal doses of sonication in the present conditions. Our results demonstrate the possibility of tailoring the pore size distribution using a low power ultrasonic bath.http://www.tf.uns.ac.rs/publikacije/PAC/pdf/45%20PAC%2004.pdfMesoporous silica matrixSol-gelSonicationSANSFractal structureSpecific surface area |
| spellingShingle | Václav Štengl Claudia Ionescu Noémi Kinga Székely Dan Nicoara Corina Enache Mihaela Popovici Ioan Sora László Almásy Jan Subrt George Gustav Savii Cecilia Savii Dana Susan Resiga Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation Processing and Application of Ceramics Mesoporous silica matrix Sol-gel Sonication SANS Fractal structure Specific surface area |
| title | Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation |
| title_full | Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation |
| title_fullStr | Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation |
| title_full_unstemmed | Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation |
| title_short | Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation |
| title_sort | mesoporous silica matrices derived from sol gel process assisted by low power ultrasonic activation |
| topic | Mesoporous silica matrix Sol-gel Sonication SANS Fractal structure Specific surface area |
| url | http://www.tf.uns.ac.rs/publikacije/PAC/pdf/45%20PAC%2004.pdf |
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