Effect of synthesis conditions on the microstructure of TEOS derived silica hydrogels synthesized by the alcohol-free sol-gel route
Silica matrices synthesized from a pre-hydrolysis step in ethanol followed by alcohol removal at low pressure distillation, and condensation in water, are suitable for encapsulation of biomolecules and microorganisms and building bioactive materials with optimized optical properties. Here we analyze...
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2011
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| 008 | 190411s2011 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-80051544589 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
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| 100 | 1 | |a Perullini, M. | |
| 245 | 1 | 0 | |a Effect of synthesis conditions on the microstructure of TEOS derived silica hydrogels synthesized by the alcohol-free sol-gel route |
| 260 | |c 2011 | ||
| 270 | 1 | 0 | |m Perullini, M.; INQUIMAE-DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pab. II, Buenos Aires C1428EHA, Argentina; email: mercedesp@qi.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a Silica matrices synthesized from a pre-hydrolysis step in ethanol followed by alcohol removal at low pressure distillation, and condensation in water, are suitable for encapsulation of biomolecules and microorganisms and building bioactive materials with optimized optical properties. Here we analyze the microstructure of these hydrogels from the dependence of I(q) data acquired from SAXS experiments over a wide range of silica concentration and pH employed in the condensation step. From the resulting data it is shown that there is a clear correlation between the microscopic parameters-cluster fractal dimension (D), elementary particle radius (a) and cluster gyration radius (R)-with the attenuation of visible light when the condensation step proceeds at pH < 6. At higher pHs, there is a steep dependence of the cluster density (~R D-3 ) with the condensation pH, and non-monotonous changes of attenuance are less than 20%, revealing the complexity of the system. These results, which were obtained for a wide pH and silica concentration range, reinforce the idea that the behavior of gels determined in a restricted interval of synthesis variables cannot be extrapolated, and comparison of gelation times is not enough for predicting their properties. © 2011 Springer Science+Business Media, LLC. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires, UBACyT X-003 | ||
| 536 | |a Detalles de la financiación: 011/02 | ||
| 536 | |a Detalles de la financiación: National Council for Scientific Research | ||
| 536 | |a Detalles de la financiación: PIP 11220080102533 | ||
| 536 | |a Detalles de la financiación: Laboratório Nacional de Luz Síncrotron, LNLS, D11A-SAXS-6039 | ||
| 536 | |a Detalles de la financiación: Acknowledgements This work has been supported by the Brazilian Synchrotron Light Laboratory (LNLS, Brazil, proposal D11A-SAXS-6039), the scientific collaboration agreement CAPES-SECyT (Brazil- Argentina, 011/02), the University of Buenos Aires (UBACyT X-003), and by National Research Council of Argentina (CONICET PIP 11220080102533). SAB, RC, MJ and MP are Research Scientists of CONICET (Argentina). | ||
| 593 | |a INQUIMAE-DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pab. II, Buenos Aires C1428EHA, Argentina | ||
| 593 | |a ECyT, Universidad Nacional de San Martín, Campus Miguelete, San Martín, Buenos Aires, Argentina | ||
| 593 | |a Institute of Physics Gleb Wataghin, State University of Campinas, Campinas, SP, Brazil | ||
| 690 | 1 | 0 | |a OPTICAL QUALITY |
| 690 | 1 | 0 | |a SAXS MICROSTRUCTURE CHARACTERIZATION |
| 690 | 1 | 0 | |a SILICA HYDROGELS |
| 690 | 1 | 0 | |a TEOS ALCOHOL-FREE |
| 690 | 1 | 0 | |a BIOACTIVE MATERIAL |
| 690 | 1 | 0 | |a CLUSTER DENSITIES |
| 690 | 1 | 0 | |a GYRATION RADII |
| 690 | 1 | 0 | |a LOW PRESSURES |
| 690 | 1 | 0 | |a OPTICAL QUALITIES |
| 690 | 1 | 0 | |a SAXS MICROSTRUCTURE CHARACTERIZATION |
| 690 | 1 | 0 | |a SILICA CONCENTRATIONS |
| 690 | 1 | 0 | |a SILICA MATRIX |
| 690 | 1 | 0 | |a SOL-GEL ROUTES |
| 690 | 1 | 0 | |a SYNTHESIS CONDITIONS |
| 690 | 1 | 0 | |a TEOS ALCOHOL-FREE |
| 690 | 1 | 0 | |a VISIBLE LIGHT |
| 690 | 1 | 0 | |a COAGULATION |
| 690 | 1 | 0 | |a CONDENSATION |
| 690 | 1 | 0 | |a DISTILLATION |
| 690 | 1 | 0 | |a ELEMENTARY PARTICLES |
| 690 | 1 | 0 | |a ETHANOL |
| 690 | 1 | 0 | |a FRACTAL DIMENSION |
| 690 | 1 | 0 | |a GELATION |
| 690 | 1 | 0 | |a GELS |
| 690 | 1 | 0 | |a HYDROGELS |
| 690 | 1 | 0 | |a OPTICAL PROPERTIES |
| 690 | 1 | 0 | |a PRESSURE EFFECTS |
| 690 | 1 | 0 | |a SILICA |
| 690 | 1 | 0 | |a SOL-GEL PROCESS |
| 690 | 1 | 0 | |a MICROSTRUCTURE |
| 700 | 1 | |a Jobbágy, M. | |
| 700 | 1 | |a Bilmes, S.A. | |
| 700 | 1 | |a Torriani, I.L. | |
| 700 | 1 | |a Candal, R. | |
| 773 | 0 | |d 2011 |g v. 59 |h pp. 174-180 |k n. 1 |p J Sol Gel Sci Technol |x 09280707 |t Journal of Sol-Gel Science and Technology | |
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