Synthesis of Silica Nanoparticles by Sol‐Gel: Size‐Dependent Properties, Surface Modification, and Applications in Silica‐Polymer Nanocomposites—A Review

Rahman, Ismail Ab; Padavettan, Vejayakumaran

doi:10.1155/2012/132424

Cited by 879 publications

(522 citation statements)

References 97 publications

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“…The nano SiO2 spheres with a narrow size distribution were prepared by Stöber method, [10] which comprised the base-catalyzed hydrolysis of TEOS in water-ethanol mixtures. In a typical process, 1.5 mL TEOS was added into a mixture of 50 mL ethanol, 1 mL deionized water and 1.5 mL aqueous ammonia.…”

Section: Methodsmentioning

confidence: 99%

Graphene Oxide-Silica Composite Fillers into the Experimental Dental Adhesives for Potential Therapy

Liu¹,

Hou²,

Chen³

et al. 2017

Med. Res.

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Section: Methodsmentioning

confidence: 99%

Graphene Oxide-Silica Composite Fillers into the Experimental Dental Adhesives for Potential Therapy

Liu¹,

Hou²,

Chen³

et al. 2017

Med. Res.

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“…In SEM images it can be distinguished that the particles size of sample prepared with APTES 25 wt% ranging 2-5 µm while sample with APTES 10 wt% showed particle size less than 1 µm. This particle size variation is attributed to the amino groups in APTES, which increase the hydrolysis rate of the inorganic precursor and promote the particle growth (Rahman et al, 2012). The chemical analysis and the elemental mapping for Si directly on the crosssection SEM image of Psu-APTES 25 wt% composite membrane were performed by energy dispersive X-ray spectroscopy (Fig.…”

Section: Sem Analysismentioning

confidence: 99%

Effect of Silica Source on the Synthesis and Properties of Polysulfone/Silica Composite Membranes for Gas Separation

Castruita¹

2018

Rev. Mex. Ing. Quim.

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This work reports the synthesis in-situ of silica particles inside a polysulfone matrix by the sol-gel method in acidic medium using different polymerization inorganic precursors: tetraethylorthosilicate (TEOS), 3-aminopropyltriethoxysilane (APTES) and mixture of them. The effect of the type of inorganic precursor on the formation of silica particles was studied. Composite membranes were prepared by casting technique from these organic-inorganic materials. These membranes were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The morphology, particle size and particle-polymer interaction were studied by scanning electron microscopy (SEM). Additionally, a semi-quantitative chemical analysis by energy dispersive X-ray spectroscopy (EDX) showed the chemical composition of the composite membranes. Type and concentration of silica precursor affected the morphology, particle size and distribution of silica in the composite membranes. Composite membranes without interfacial voids were obtained from APTES at 25 wt%. Initial studies about the gas separation properties of CO 2 /CH 4 gas mixture revealed an improvement on the CO 2 permeability of composite membrane comprising silica particles synthesized from APTES in comparison with the polymeric membrane. Keywords: silica, sol-gel, polysulfone, composite membrane, gas separation. ResumenEn este trabajo se reporta la síntesis in-situ de partículas de sílice dentro de una matriz de polisulfona mediante el método sol-gel en medio ácido usando diferentes precursores inorgánicos de polimerización: tetraetilortosilicato (TEOS), 3-aminopropiltrietoxisilano (APTES) y mezcla de ambos. Se estudió el efecto del tipo de precursor inorgánico en la formación de las partículas de sílice. Las membranas compuestas se prepararon por evaporación del disolvente a partir de los materiales orgánico-inorgánico. Estas membranas se caracterizaron por difracción de rayos X (XRD), espectroscopía de infrarrojo (FTIR), calorimetría diferencial de barrido (DSC) y análisis termogravimétrico (TGA). La morfología, tamaño de partícula y la interacción partícula-polímero se estudiaron por microscopia electrónica de barrido (SEM). Adicionalmente, el análisis químico semicuantitativo mediante espectroscopía de energía dispersiva de rayos X (EDX) mostró la composición química de las membranas compuestas. El tipo y la concentración del precursor de la sílice afectaron la morfología, el tamaño de partícula y la distribución de la sílice en las membranas compuestas. Las membranas compuestas que fueron obtenidas a partir de APTES al 25% no mostraron huecos interfaciales. Estudios iniciales de las propiedades de separación de una mezcla CO 2 /CH 4 revelaron el mejoramiento de la permeabilidad de CO 2 de las membranas compuestas que contienen partículas de sílice sintetizadas a partir de APTES en comparación con la membrana polimérica.

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“…Silica particles were prepared by the stober process [21]. In 200 mL beaker tetraethoxysilance (TEOS) was dissolved in ethanol.…”

Section: Preparation Of Silica Particlesmentioning

confidence: 99%

Synthetic Strategies towards Silica/Poly (Acrylamide-Co-Acrylic Acid) Composites

Shirsath¹,

Gite²,

Meshram³

2017

MOCR

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Abstract. Herein, we are reporting increased thermal properties and self-sustaining ability of polymer compositions with silica. The composite of poly (acrylamide-co-acrylic acid) [P(AM-co-AA)] with silica created intermolecular interactions. The formation of a composite has confirmed by FTIR spectroscopy, DSC, TGA, and FE-SEM analysis. The silica particles were homogeneously distributed in the P(AM-co-AA). The incorporation of silica particles gives rise to the enhancement of thermal stability due to the strong interactions between silica and poly (acrylamide-co-acrylic acid) polymer. Graphical AbstractKeywords: Poly(acrylamide-co-acrylic acid), silica particles, composite, thermal stability IntroductionPolymer composites have been widely studied over a long period of time and over the past few decades, organic polymer-inorganic oxide filler composites have replaced a lot of the conventional polymers in application fields. They are generally organic polymer composites filled with inorganic fillers. Their properties combine the advantages of the inorganic filler material (i. e., rigidity, thermal stability) and of the organic polymer (i.e., flexibility, ductility, process ability) [1]. In addition to such functionalization, composition can successfully reinforce materials; a characteristic example is natural rubbers reinforced by carbon black and silica for practical utilizing as tire materials. Although the composites strategy is useful for the design of relatively hard functional materials, it is not simple to recognize soft composite materials because of the strong interactions at the interface that decrease the polymer chain mobility [2]. A successful way to improve mechanical properties of a polymer is to create their composites or blend with other polymers that have better mechanical properties for the intended applications [3]. Schmidt et al. synthesised conductive composites of polymer using the biologically active polysaccharide hyaluronic acid (HA) as the dopant in order to create biomaterials for tissue engineering and wound-healing applications [4].Among inorganic oxide fillers, silica particles have received much attention due to their well-defined ordered structure, high surface area, cost-effective production, and the ease of surface modification [5]. In the polymer composition with silica particles, this can improve thermal properties and self-sustaining

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Synthesis of Silica Nanoparticles by Sol‐Gel: Size‐Dependent Properties, Surface Modification, and Applications in Silica‐Polymer Nanocomposites—A Review

Cited by 879 publications

References 97 publications

Graphene Oxide-Silica Composite Fillers into the Experimental Dental Adhesives for Potential Therapy

Graphene Oxide-Silica Composite Fillers into the Experimental Dental Adhesives for Potential Therapy

Effect of Silica Source on the Synthesis and Properties of Polysulfone/Silica Composite Membranes for Gas Separation

Synthetic Strategies towards Silica/Poly (Acrylamide-Co-Acrylic Acid) Composites

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