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Yamaguchi T, Yamamoto T. Density and porosity analyses of porous hybrid microparticles containing gas in closed pores using centrifugal liquid sedimentation-dynamic light scattering combined analytical method. ANAL SCI 2024:10.1007/s44211-024-00623-6. [PMID: 38910155 DOI: 10.1007/s44211-024-00623-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Accepted: 06/14/2024] [Indexed: 06/25/2024]
Abstract
Porous hybrid microparticles are characterized by their densities and porosities. Consequently, the evaluation for density and porosity of porous hybrid microparticles in liquids is crucial for predicting the transport of particles in the atmosphere, human body, and industrial processes. However, direct measurement of the density and porosity of porous hybrid microparticles in liquids remains a challenge. In this study, we investigated the centrifugal sedimentation of polystyrene-silica hybrid microparticles with and without gas-containing closed pores. A centrifugal liquid sedimentation-dynamic light scattering combined analytical method was employed to determine the apparent densities of hybrid microparticles with and without gas-containing closed pores. The porosity of the hybrid microparticles with gas-containing closed pores was elucidated based on the inner buoyancy, which is a centrifugal force generated by the presence of low-density gas inside numerous closed pores. Further, the inner gas buoyancy was analyzed to estimate the particle porosity in liquids. The results obtained in this study confirmed the feasibility of utilizing the proposed method to determine the apparent density and porosity of porous hybrid microparticles in liquids.
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Affiliation(s)
- Tetsuji Yamaguchi
- HORIBA, Ltd., 2 Miyanohigashi, Kisshoin, Minami-ku, Kyoto, 601-8510, Japan.
| | - Tetsuya Yamamoto
- Department of Chemical Systems Engineering, Nagoya University, Nagoya, 464-8603, Japan
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Semenova A, Vidallon MLP, Follink B, Brown PL, Tabor RF. Synthesis and Characterization of Polyethylenimine-Silica Nanocomposite Microparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:191-202. [PMID: 34932365 DOI: 10.1021/acs.langmuir.1c02393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A novel procedure for the synthesis of polyethylenimine (PEI)-silica nanocomposite particles with high adsorption capacities has been developed based on an emulsion templating concept. The exceptional chelating properties of PEI as the parent polymer for the particle core promote the binding abilities of the resulting composite for charged species. Further, the subsequent introduction of silica via the self-catalyzed hydrolysis of tetraethoxysilane facilitates production of robust composite particles with smooth surfaces, enabling potential use in multiphase environments. To enable tailored application in solid/liquid porous environments, the production of particles with reduced sizes was attempted by modulating the shear rates and surfactant concentrations during emulsification. The use of high-speed homogenization resulted in a substantial decrease in average particle size, while increasing surfactant loading only had a limited effect. All types of nanocomposites produced demonstrated excellent binding capacities for copper ions as a test solute. The maximum binding capacities of the PEI-silica nanocomposites of 210-250 mg/g are comparable to or exceed those of other copper binding materials, opening up great application potential in resources, chemical processing, and remediation industries.
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Affiliation(s)
- Alexandra Semenova
- School of Chemistry, Monash University, 19 Rainforest Walk, Clayton 3800, Australia
| | | | - Bart Follink
- School of Chemistry, Monash University, 19 Rainforest Walk, Clayton 3800, Australia
| | - Paul L Brown
- Bundoora Technical Development Centre, Rio Tinto, 1 Research Avenue, Bundoora 3083, Australia
| | - Rico F Tabor
- School of Chemistry, Monash University, 19 Rainforest Walk, Clayton 3800, Australia
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Yamamoto T, Tsutsumi K. Decomposing Oil-Soluble Initiators in Particles: A Template-Free Method for the Preparation of Hollow Polymer and Silica Particles. ACS OMEGA 2021; 6:31677-31682. [PMID: 34869991 PMCID: PMC8637971 DOI: 10.1021/acsomega.1c04197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 11/05/2021] [Indexed: 06/13/2023]
Abstract
Nanovoids contained in hollow particles render them potential drug carriers. However, conventional methods for the synthesis of these particlhes involve complex processes. In this study, we developed a template-free method for the synthesis of hollow polymer and silica particles by initially preparing polystyrene core particles containing 2,2'-azobis(2-methylbutyronitrile) (V-59) through soap-free emulsion polymerization. The subsequent generation of nitrogen gas inside these particles upon the decomposition of V-59 at 70 °C led to the formation of voids. In addition, silica shells were synthesized on the surfaces of the V-59-containing polystyrene core particles through a sol-gel reaction at 40 °C, following which voids were formed by the decomposition of V-59 at 70 °C. The developed method involves straightforward steps and is environmentally friendly, as it does not require the use of surfactants, organic solvents, or templates.
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Affiliation(s)
- Tetsuya Yamamoto
- Department
of Chemical Systems Engineering, Nagoya
University, Furo-cho, Chikusa-ku, Nagoya-shi 464-8603, Japan
| | - Kazuya Tsutsumi
- Department
of Materials and Design Innovation Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-shi 464-8603, Japan
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Li H, Chen X, Shen D, Wu F, Pleixats R, Pan J. Functionalized silica nanoparticles: classification, synthetic approaches and recent advances in adsorption applications. NANOSCALE 2021; 13:15998-16016. [PMID: 34546275 DOI: 10.1039/d1nr04048k] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nanotechnology is rapidly sweeping through all the vital fields of science and technology such as electronics, aerospace, defense, medicine, and catalysis. It involves the design, synthesis, characterization, and applications of materials and devices on the nanometer scale. At the nanoscale, physical and chemical properties differ from the properties of the individual atoms and molecules of bulk matter. In particular, the design and development of silica nanomaterials have captivated the attention of several researchers worldwide. The applications of hybrid silicas are still limited by the lack of control on the morphology and particle size. The ability to control both the size and morphology of the materials and to obtain nano-sized silica particles has broadened the spectrum of applications of mesoporous organosilicas and/or has improved their performances. On the other hand, adsorption is a widely used technique for the separation and removal of pollutants (metal ions, dyes, organics,...) from wastewater. Silica nanoparticles have specific advantages over other materials for adsorption applications due to their unique structural characteristics: a stable structure, a high specific surface area, an adjustable pore structure, the presence of silanol groups on the surface which allow easy modification, less environmental harm, simple synthesis, low cost, etc. Silica nanoparticles are potential adsorbents for pollutants. We present herein an overview of the different types of silica nanoparticles going from the definitions to properties, synthetic approaches and the mention of potential applications. We focus mainly on the recent advances in the adsorption of different target substances (metal ions, dyes and other organics).
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Affiliation(s)
- Hao Li
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
- Anhui Laboratory of Molecules-Based Materials, College of Chemistry and Materials Sciences, Anhui Normal University, Wuhu 241002, Anhui, China
| | - Xueping Chen
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
| | - Danqing Shen
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
| | - Fan Wu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
| | - Roser Pleixats
- Department of Chemistry and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universitat Autònoma de Barcelona, Cerdanyola del Vallès 08193, Barcelona, Spain.
| | - Jianming Pan
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
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The role of vinyl terminated silanes for producing highly concentrated polystyrene slurries in a single step process. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04754-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yamamoto T, Takahashi Y. Controlling Porous Hollow Silica Particles through Soap-free Emulsion Polymerization with Polymer Core Particles. CHEM LETT 2019. [DOI: 10.1246/cl.190513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tetsuya Yamamoto
- Department of Materials and Design Innovation Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Yuya Takahashi
- Department of Materials and Design Innovation Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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Li Y, Wang Y, Ambreen J, Yang C, Ngai T. Synthesis of structured hollow microspheres with sandwich-like hybrid shell of RGO/Pd/m-SiO2 for highly efficient catalysis. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.059] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Penelas MJ, Contreras CB, Giussi JM, Wolosiuk A, Azzaroni O, Soler Illia GJ. Controlling dispersion, stability and polymer content on PDEGMA-functionalized core-brush silica colloids. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Yamamoto T, Takahashi Y. Synthesis of polystyrene@silica particles through soap-free emulsion polymerization and sol-gel reaction on polymer surfaces. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2018.10.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yamamoto T, Arakawa K, Furuta R, Teshima A. Antimicrobial Activities of Polymers Synthesized through Soap-free Emulsion Polymerization Using a Cationic Initiator and Styrene Derivative Monomers. CHEM LETT 2018. [DOI: 10.1246/cl.180762] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tetsuya Yamamoto
- Department of Materials and Design Innovation Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Kenji Arakawa
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8530, Japan
| | - Ryo Furuta
- Department of Chemical and Biological Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Aiko Teshima
- Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8530, Japan
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