Synthesis and characterization of functionalized silica as fillers of polymeric systems

Musante, Leonardo; Turallas, A.C.; Romanelli, Gustavo Pablo; Vázquez, Patricia

doi:10.1007/s10971-005-6619-9

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…FT-IR spectroscopy and pH measurements were mainly used to characterize the hybrid nanosilicas. The effect of using different catalysts, mainly hydrochloric and acetic acid, during the sol-gel reaction, has been shown earlier [20,21]. On the basis of the results obtained, acetic acid was chosen as catalyst in this study.…”

Section: Resultsmentioning

confidence: 92%

Synthesis and Characterization of New Organic–Inorganic Hybrid Nanosilica Fillers Prepared by Sol–Gel Reaction

Musante

Vázquez

Torregrosa-Maciá

et al. 2010

Composite Interfaces

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In light of the success of making multicomponent sol-gel glasses, in this study the synthesis of new hybrid nanosilicas with controlled hydrophilic/hydrophobic properties was carried out by incorporating organic based species with appropriate functional groups to inorganic based alkoxides by co-condensation reaction. Furthermore, in this study the acidity and the water content during reaction synthesis was proven to be critical in controlling the structure of the hybrid nanosilicas. These nanosilicas with different hydrophobicity were obtained by using TEOS (tetraethylorthosilicate) and 10 wt% two organic modifiers (tris-hydroxymethylaminomethane -TRIS -and 1,1,1,3,3,3-hexamethyldisilazane-HDMS). The average diameter of the nano-particles ranged between 7 and 10 nm. The addition of the organic modifiers changed the pH of the hybrid nanosilicas, to a different extent depending on the nature of the organic modifier. The hydrophobicity in the hybrid nanosilicas estimated from pH measurements in water and ethanol, and from IR spectroscopy, can be tailored by incorporating different organic modifiers on the network during synthesis. Finally, the measurement of pH of the hybrid nanosilicas by using solvents with different polarity/acidity was a simple and efficient method of assessing the hydrophobicity of the nanosilicas.

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Section: Resultsmentioning

confidence: 92%

Synthesis and Characterization of New Organic–Inorganic Hybrid Nanosilica Fillers Prepared by Sol–Gel Reaction

Musante

Vázquez

Torregrosa-Maciá

et al. 2010

Composite Interfaces

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“…La modificación de la superficie de la sílice empleando APS bloquea tres grupos silanoles (Si-OH) y genera un grupo amino (-NH2) terminal. Es importante destacar además que la cantidad de APS empleada en el proceso de funcionalización y el proceso de lavado y secado del material tiene gran influencia sobre las propiedades texturales del nuevo material híbrido generado [81][82][83][84].…”

Section: Sílices Funcionalizadas (Si-x)unclassified

Síntesis sustentable de compuestos de interés agroquímico: chalconas, benzodiazepinas, y 1,2,3,4-tetrahidroisoquinoleínas

Pasquale¹

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Se aplican los postulados de la Química Verde a la preparación de compuestos orgánicos de interés agroquímico de la familia de Chalconas, Benzodiazepinas, y 1,2,3,4-tetrahidroisoquinoleinas. En particular se prepararon y caracterizaron una serie de catalizadores heterogéneos. Se estudiaron catalizadores de Wells-Dawson, Preyssler y materiales híbridos a base de sílice funcionalizados con 3-aminopropiltrietoxisilano. Se estudió la reutilización de los mismos. Se optimizaron las condiciones de reacción de modo de obtener altos rendimientos y selectividad.

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Synthesis of chalcones catalyzed by aminopropylated silica sol–gel under solvent-free conditions

Romanelli

Pasquale

Sathicq

et al. 2011

Journal of Molecular Catalysis A: Chemical

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Synthesis and characterization of functionalized silica as fillers of polymeric systems

Cited by 5 publications

References 6 publications

Synthesis and Characterization of New Organic–Inorganic Hybrid Nanosilica Fillers Prepared by Sol–Gel Reaction

Synthesis and Characterization of New Organic–Inorganic Hybrid Nanosilica Fillers Prepared by Sol–Gel Reaction

Síntesis sustentable de compuestos de interés agroquímico: chalconas, benzodiazepinas, y 1,2,3,4-tetrahidroisoquinoleínas

Synthesis of chalcones catalyzed by aminopropylated silica sol–gel under solvent-free conditions

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