Composite polymer particles with stimuli-responsive surface properties and specific activity of adsorbed/released trypsin

Alam, Md. Ashraful; Miah, M. A. Jalil; Ahmad, Hasan

doi:10.1007/s00396-006-1638-9

Cited by 15 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The heterogeneous surface with extended outward surface structure of PS/PANi–Fe 3 O 4 composite particles suggests the modification of PS seed particles. At higher aniline content (PS/PANi = 1/0.5), some free nanosized tiny particles comprising either PANi–Fe 3 O 4 or Fe 3 O 4 particles are byproduced via secondary nucleation . Hence, the increase in aniline content favored in situ polymerization and precipitation outside the PS seed particles.…”

Section: Resultsmentioning

confidence: 99%

Single step modification of micrometer‐sized polystyrene particles by electromagnetic polyaniline and sorption of chromium(VI) metal ions from water

Debnath

Rahman

Minami

et al. 2019

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

This article describes a single‐step reproducible approach for the surface modification of micrometer‐sized polystyrene (PS) core particles to prepare electromagnetic PS/polyaniline–Fe3O4 (PS/PANi–Fe3O4) composite particles. The electromagnetic PANi–Fe3O4 shell was formed by simultaneous seeded chemical oxidative polymerization of aniline and precipitation of Fe3O4 nanoparticles. The weight ratio of PS to aniline was optimized to produce core–shell structure. PS/PANi–Fe3O4 composite particles were used as adsorbent for the removal of Cr(VI) via anion‐exchange mechanism. The composite particles possessed enough magnetic property for magnetic separation. The adsorption was highly pH dependent. Adsorption efficiency reached 100% at pH 2 in 120 min when 0.05 g of composite particles was mixed with 30 mL 5 mg L−1 Cr(VI) solution. The adsorption isotherm fitted best with Freundlich model and maximum adsorption capacity approached 20.289 mg g−1 at 323 K. The prepared composite was found to be an useful adsorbent for the removal of soluble Cr(VI) ions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47524.

show abstract

Section: Resultsmentioning

confidence: 99%

Single step modification of micrometer‐sized polystyrene particles by electromagnetic polyaniline and sorption of chromium(VI) metal ions from water

Debnath

Rahman

Minami

et al. 2019

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…pNIPAM has been employed in combination with three dimensional photonic crystals to produce sensors. 4 pNIPAM-based beads 5 have been combined with proteins 6,7 and nanoparticles. Several strategies have been reported to combine metallic, magnetic or semiconductor nanoparticles with pNIPAM-based spheres by incubation of both systems, by using the beads as reactors, [8][9][10] or by polymerization in the presence of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

CdSe/CdS nanoparticles immobilized on pNIPAm-based microspheres

Salcher¹,

Nikolić

Casado

et al. 2010

J. Mater. Chem.

View full text Add to dashboard Cite

In this work, CdSe/CdS semiconductor ligand-exchanged nanoparticles have been immobilized on poly-(N-isopropylacrylamide) (pNIPAM)-based microspheres. The size and the shrinkage capacity of the spheres can be tuned by the ratio of NIPAM/styrene (pNIPAM-PS spheres) or NIPAM/BIS (N-N 0methylene-bis-acrylamide) and MA (maleic acid) (pNIPAM-BIS-MA spheres). A ligand-exchange procedure for the transfer of initially organic compatible nanoparticles into aqueous solution using amine-modified or thiol-modified poly(ethylene oxide)s (PEOs) has been carried out prior to their immobilization. We observed that the interaction of the nanoparticles with the pNIPAM-based system depends on the nature of the ligands and the chemical composition of the microspheres. Nanoparticles capped with amine-or mercapto-poly(ethylene oxide)s ligands interact with pNIPAM-PS beads while only amine-capped ones show a clear tendency to interact with pNIPAM containing acid groups which leads to a high nanoparticle coverage. Dynamic light scattering measurements, atomic force microscopy and optical spectroscopy hint that nanoparticles are placed on the surface of pNIPAM-BIS-MA beads while being partially incorporated into pNIPAM-PS network. Cell culture studies demonstrate that the fluorescent composites show non-specific binding to fibroblasts. These features may be very valuable to develop materials for drug delivery and specific targeting of cells combined with the outstanding optical properties of semiconductor nanoparticles as fluorescent labelers.

show abstract

“…transitions, which enable their use in the fabrication of ''smart'' materials and ''switchable'' devices. [1][2][3][4][5] Recently, the use of hybrid polymer-inorganic microgels comprising semiconductor quantum dots or nanoparticles of noble metals has opened new avenues in the synthesis and fabrication of materials with advanced properties. [6][7][8][9][10][11][12][13][14][15] In particular, the sequestering of gold nanoparticles by temperature-responsive polymer microgels paved the way to photothermally triggered swelling-deswelling transitions of the polymer host.…”

mentioning

confidence: 99%