Zirconocene immobilization into organic-inorganic dual-shell silicas prepared by the nonhydrolytic sol-gel method for polyethylene production

Ullmann, Marcius A.; Santos, João Henrique Zimnoch dos

doi:10.1016/j.jcat.2020.03.001

Cited by 8 publications

(2 citation statements)

References 54 publications

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“…Silane coupling agents are the most commonly used modifiers for modifying SNs [124]. Silane coupling agents have dual reactive functional groups, and its general formula is usually expressed as RSiX 3 .…”

Section: Grafting Silane Coupling Agentmentioning

confidence: 99%

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Emerging Applications of Silica Nanoparticles as Multifunctional Modifiers for High Performance Polyester Composites

et al. 2021

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Nano-modification of polyester has become a research hotspot due to the growing demand for high-performance polyester. As a functional carrier, silica nanoparticles show large potential in improving crystalline properties, enhancing strength of polyester, and fabricating fluorescent polyester. Herein, we briefly traced the latest literature on synthesis of silica modifiers and the resultant polyester nanocomposites and presented a review. Firstly, we investigated synthesis approaches of silica nanoparticles for modifying polyester including sol-gel and reverse microemulsion technology, and their surface modification methods such as grafting silane coupling agent or polymer. Then, we summarized processing technics of silica-polyester nanocomposites, like physical blending, sol-gel processes, and in situ polymerization. Finally, we explored the application of silica nanoparticles in improving crystalline, mechanical, and fluorescent properties of composite materials. We hope the work provides a guideline for the readers working in the fields of silica nanoparticles as well as modifying polyester.

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Section: Grafting Silane Coupling Agentmentioning

confidence: 99%

“…In the beginning, MPS was hydrolyzed in the presence of water and acid to produce reactive Si-OH groups. Subsequently three possibilities [125][126][127] (3-aminopropyl) triethoxysilane APTES [124]. Silane coupling agents have dual reactive functional groups, and its general formula is usually expressed as RSiX3.…”

Section: Grafting Silane Coupling Agentmentioning

confidence: 99%

Emerging Applications of Silica Nanoparticles as Multifunctional Modifiers for High Performance Polyester Composites

et al. 2021

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A Mini Review on the Synthesis of Mesoporous Silica and its Application in Antibiotic Removal

Wang,

Li,

Bao

et al. 2024

Advanced Sustainable Systems

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In recent years, antibiotics have been widely used in multiple fields such as agriculture, forestry, animal husbandry as well as human health due to their high efficiency and low price in treating bacterial infections. However, the misuse of antibiotics has posed a serious threat to both ecological environment and human health, resulting in the antibiotic contamination as a global issue. Therefore, the development of novel materials and technologies to remove antibiotics from water has become a research frontier and hotspot. Meanwhile, mesoporous silica materials have been gradually used in the removal of antibiotics via adsorption and degradation due to their controllable structure, tunable pore size as well as diverse sources. This mini review focuses on the research progress of mesoporous silica in removing antibiotics from aquatic environments. The main types and controllable synthesis procedures of mesoporous silica is introduced first, followed by their application in antibiotics removal via both adsorption and catalytic degradation. Furthermore, it proposes the future directions of this field, providing insights for the use of mesoporous silica materials in water pollution control.

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Encapsulated Colorimetric Indicators used as Additives During the Polymerization of Smart Polyethylene

Heck

Santos

2023

Macro Reaction Engineering

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A number of colorimetric pH indicators (phenolphthalein, bromocresol green, 4‐nitrophenol, phenol red, and bromothymol blue) are encapsulated within silica particles via an acid‐catalyzed sol–gel process. The fabricated indicator is added during ethylene polymerization with a metallocene (Cp2ZrCl2) catalyst. Introduction of the indicator into the silica matrix affects the surface area, probably by partially blocking some of the pores. The encapsulated pH indicator reduces the catalytic activity by up to 17%, whereas adding a solution of the indicator reduced the catalytic activity by up to 34%. The crystallinities of the samples containing the silica‐encapsulated pH indicators are lower than those of the samples to which the pH indicator is added in solution form. The prepared encapsulated colorimetric pH indicators are analyzed by diffuse reflectance UV‐vis spectroscopy. The measured color values are distributed according to the CIE Lab lightness psychometric color space. Addition of the indicator in solution form (free) to the ethylene polymerization reaction does not result in indicator activity in acidic or alkaline media. The pH indicators incorporated into the polyethylene show color changes when exposed to acidic and alkaline media. Samples to which the unencapsulated pH indicators (free) are added exhibit lower catalytic activities and higher crystallinities than the samples containing the encapsulated pH.

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Zirconocene immobilization into organic-inorganic dual-shell silicas prepared by the nonhydrolytic sol-gel method for polyethylene production

Cited by 8 publications

References 54 publications

Emerging Applications of Silica Nanoparticles as Multifunctional Modifiers for High Performance Polyester Composites

Emerging Applications of Silica Nanoparticles as Multifunctional Modifiers for High Performance Polyester Composites

A Mini Review on the Synthesis of Mesoporous Silica and its Application in Antibiotic Removal

Encapsulated Colorimetric Indicators used as Additives During the Polymerization of Smart Polyethylene

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