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

Abstract

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.

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

“…For all three particles, their average hydrodynamic diameter was slightly larger than the average diameters obtained from the SEM analyses. This increment in sizes is because of the hydration layers of polar groups via hydrogen bonding with water, while the SEM analyses were performed in the dried state of solid particles, where was not any possibility of swelling of the particles. , To evaluate elemental compositions of the surface of both reference PS/P­(MMA-AAm-EGDMA) and aminated PS/P­(MMA-AAm-EGDMA) composite particles, SEM-EDX elemental mapping measurements were conducted, and the obtained data are shown in Figures S4and d–g, respectively. EDX elemental combined mapping revealed the presence of C, N, and O as their elements in both the reference and aminated composites .…”

“…This increment in sizes is because of the hydration layers of polar groups via hydrogen bonding with water, while the SEM analyses were performed in the dried state of solid particles, where was not any possibility of swelling of the particles. 37,38 To evaluate their elements in both the reference and aminated composites. 35 The individual atom distributions for C, N, and O were revealed from the surface of particles (Figure 2e− g).…”

Synthesis and Characterization of Bi-Functional Poly (Acrylic Acid-Co-2-hydroxyethylmethacrylate) Coated Iron Oxide Magnetic Composite Particles

“…The fabrication of hybrid inorganic/organic polymer composites offers advantages especially when those applications depend on mechanical and surface properties. These inorganic-organic hybrid polymer particles find wide application potentials in catalysis, electrical, optical and electronic or photonic devices, biomaterials, flameretardant and coatings [12][13][14][15][16][17][18][19][20]. There is an increasing interest in the synthesis of nano-sized metal oxides Coated Iron Oxide Magnetic Composite Particles because of their large surface area unusual adsorptive properties, surface defects, fast diffusivities and quantum size effects which are different from those of bulk materials [21][22][23][24][25].…”

A generalized technique for the encapsulation of nano‐sized NiO particles by styrene‐2‐hydroxyethyl methacrylate copolymer

“…Fabrication of inorganic/organic composite particles sometimes identified as hybrid particles is drawing much interest from the researchers as such particles can display the combined properties of inorganic and organic materials. In inorganic/organic composite particles the inorganic oxides generally exhibit improved mechanical, electrical, chemical, rheological, magnetic and optical properties based on the variability in composition, dimension and structure whereas the organic part provides colloidal stability by steric or electrostatic mechanism, hydrophilicity, easy processability and improved functionality . Depending on the versatile properties these inorganic/organic composite particles find wide range of applications in catalysis, electrical, optical and electronic or photonic devices, biomaterials, flame‐retardant and coatings .…”