Encapsulation of submicron-sized silica particles by stimuli-responsive copolymer shell layer

Rahman, Mohammad Abdur; Karim, Md. Rabiul; Miah, M. A. Jalil; Ahmad, Hasan; Yamashita, Tsuyoshi

doi:10.1007/s13233-010-0301-y

Cited by 6 publications

(3 citation statements)

References 48 publications

(45 reference statements)

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“…After seeded copolymerization of PS seed particles, the size increased and the surface morphology was also slightly improved. 33 , 34 However, successive amine functionalization of PS/P(MMA-AAm-EGDMA) particles fairly altered the surface topology, while the shape of the aminated composite particles was unchanged. 35 The average diameters of the PS seed ( Figure 2 a), reference composite ( Figure 2 b), and aminated composite polymer particles ( Figure 2 c) were 1706.61, 1976.56, and 1968.94 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Mahamud,

Galib,

Islam

et al. 2023

ACS Omega

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Multifunctional surface-active polymeric composites are attractive materials for the adsorption of various small molecules. Herein, dual-functionalized micron-sized surface-active composite polymer particles were prepared by a three-step process for CO2 adsorption. First, polystyrene (PS) seed particles were prepared via the dispersion polymerization of styrene. PS/P(MMA-AAm-EGDMA) composite polymer particles were then synthesized by aqueous seeded copolymerization of methyl methacrylate (MMA) and acrylamide (AAm) in the presence of an ethylene glycol dimethacrylate (EGDMA) cross-linker. Finally, the amide moieties of PS/P(MMA-AAm-EGDMA) composite particles were converted into an amine-functionalized composite by using the Hofmann degradation reaction. The presence of primary amine groups on the surface of aminated composite particles was confirmed by some conventional chemical routes, such as diazotization and Schiff’s base formation reactions. The formation and functionality of the PS seed, PS/P(MMA-AAm-EGDMA), and aminated PS/P(MMA-AAm-EGDMA) composite polymer particles were confirmed by Fourier transform infrared (FTIR) spectra analyses. Scanning electron microscopy (SEM) analysis revealed spherical shape, size, and surface morphologies of the PS seed, reference composite, and aminated composites. The elemental surface compositions, surface porosity, pore volume, pore diameter, and surface area of both composite particles were evaluated by energy-dispersive X-ray (EDX) mapping, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) analyses. Dynamic light scattering (DLS) and ζ-potential measurements confirmed the pH-dependent surface properties of the functionalized particles. The amount of the adsorbed anionic emulsifier, sodium dodecyl sulfate (SDS), on the surface of aminated PS/P(MMA-AAm-EGDMA) is higher at pH 4 than that at pH 10. A vice versa result was found in the case of cationic surfactant, hexadecyltrimethylammonium bromide (HTABr), adsorption. Synthesized aminated composite particles were used as an adsorbent for CO2 adsorption via bubbling CO2 in an aqueous medium. The changes in dispersion pH were monitored continuously during the adsorption of CO2 under various conditions. The amount of CO2 adsorption by aminated composite particles was found to be 209 mg/g, which is almost double that of reference composite particles.

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Section: Resultsmentioning

confidence: 99%

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Mahamud,

Galib,

Islam

et al. 2023

ACS Omega

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“…Thermoresponsive particles based on PNIPAM are usually produced by thermal freeradical polymerization of the related monomers. Typically, the formation of particles occurs from an emulsion [12], by precipitation polymerization from a solvent [13], or by growth on preformed nanoparticle seeds [14,15]. The seed-based method can also be used for generating core-multishell particles, which mostly have an inorganic core in the nanometer range [15].…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Synthesis and Properties of Thermoresponsive Hydrogel Core–Shell Particles

Kronfeld,

Köhler,

Ellinger

2024

J. Compos. Sci.

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An approach is demonstrated for the generation of swellable core–shell particles in the sub-millimeter range using a one-step microfluidic method. Particles are made of an agarose gel core and a shell consisting of hydrogel based on crosslinked poly-(N-isopropylacrylamide) (PNIPAM). Solidification of the core was achieved by cooling below the sol–gel temperature, while the shell was cured by photoinitiated co-polymerization. The shell of the particles is reversibly thermoresponsive; it contracts upon heating, releasing water, and becomes hydrophobic. The transition temperature as well as the stability of the particles are mainly affected by the shell monomer composition, while they are less affected by the type of the core material. Such composite particles remain swellable after drying.

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“…Inorganic–organic microspheres are attracting much interest considering their unusual and possibly unique optical, mechanical, rheological, electrical, catalytic, and flame‐retardant properties . A huge variety of inorganic materials has been used for preparing such hybrid microspheres with silica (SiO 2 ) being the most widely used because colloidal silica spheres uniform in size, shape, and composition are widespread in nature and in electronics and medicine …”

Section: Introductionmentioning

confidence: 99%

Preparation of magnetically doped multilayered functional silica particles via surface modification with organic polymer

Rahman

Miah

Minami

et al. 2012

Polymers for Advanced Techs

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Magnetically modified functional particles are emerging as one of the most promising candidate in numerous multidisciplinary applications. In this research, a simple process has been developed to prepare magnetically modified aminated silica (SiO2) particles. Herein, submicron‐sized SiO2 particles were modified with poly(methylmethacrylate‐methacrylic acid) by seeded polymerization without any stabilizer. The carboxyl groups localized near the particles surface were then covalently linked with ethylene diamine to prepare aminated composite particles. Iron ions were then precipitated on the surface of aminated composite particles to obtain magnetically doped functional SiO2 particles. The preparation of such particles was confirmed by scanning electron microscopy, Fourier transform infrared, 1H NMR, X‐ray photoelectron spectroscopy and thermogravemetric analyses. Relative measurement of adsorption study of different biomolecules suggested that magnetically doped functional silica particles are comparatively hydrophobic. Copyright © 2012 John Wiley & Sons, Ltd.

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Encapsulation of submicron-sized silica particles by stimuli-responsive copolymer shell layer

Cited by 6 publications

References 48 publications

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Microfluidic Synthesis and Properties of Thermoresponsive Hydrogel Core–Shell Particles

Preparation of magnetically doped multilayered functional silica particles via surface modification with organic polymer

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Encapsulation of submicron-sized silica particles by stimuli-responsive copolymer shell layer

Cited by 6 publications

References 48 publications

Capturing Acidic CO2 Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Capturing Acidic CO2 Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Microfluidic Synthesis and Properties of Thermoresponsive Hydrogel Core–Shell Particles

Preparation of magnetically doped multilayered functional silica particles via surface modification with organic polymer

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Product

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Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium