scholarly journals Morphological Analysis of PSMA/PEI Core–Shell Nanoparticles Synthesized by Soap-Free Emulsion Polymerization

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1958
Author(s):  
Jae-Jung Park ◽  
Yongsoo Kim ◽  
Chanmin Lee ◽  
Donghyun Kim ◽  
Wonjun Choi ◽  
...  
Keyword(s):  
Particle Size ◽  
Maleic Anhydride ◽  
Emulsion Polymerization ◽  
Particle Distribution ◽  
Polymer Particle ◽  
Feed Ratio ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Soap Free Emulsion Polymerization ◽  
Core Shell Nanoparticles

Emulsion polymerization presents the disadvantage that the physical properties of polymer particles are altered by surfactant adsorption. Therefore, in the soap-free emulsion polymerization method, a hydrophilic initiator is utilized while inducing repulsion among particles on the polymer particle surface, resulting in stable polymer particle production. In this study, we developed a methodology wherein spherical and uniform poly(styrene-co-maleic anhydride) (PSMA)/polyethyleneimine (PEI) core–shell nanoparticles were prepared. Further, their morphology was analyzed. During PSMA polymerization, the addition of up to 30% maleic anhydride (MA) resulted in stable polymerization. In PSMA/PEI nanoparticle fabrication, the number of reactants increased with increased initial monomer feed amounts; consequently, the particle size increased, and as the complete monomer consumption time increased, the particle distribution widened. The styrene (St) copolymer acted as a stabilizer, reducing particle size and narrowing particle distribution. Furthermore, the monomers were more rapidly consumed at high initiator concentrations, irrespective of the initiator used, resulting in increased particle stability and narrowed particle distribution. The shell thickness and particle size were PEI feed ratio dependent, with 0.08 being the optimal PEI-to-MA ratio. The fabricated nanoparticles possess immense potential for application in environmental science and in chemical and health care industries.

scholarly journals Synthesis and Advanced Characterization of Polymer-Protein Core-Shell Nanoparticles

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 730
Author(s):  
Erik Sarnello ◽  
Tao Li
Keyword(s):  
Particle Size ◽  
Small Angle ◽  
Core Shell ◽  
Assembly Process ◽  
Shell Nanoparticles ◽  
X Ray ◽  
X Ray Scattering ◽  
Wide Range ◽  
Core Shell Nanoparticles ◽  
Ray Scattering

Enzyme immobilization techniques are widely researched due to their wide range of applications. Polymer–protein core–shell nanoparticles (CSNPs) have emerged as a promising technique for enzyme/protein immobilization via a self-assembly process. Based on the desired application, different sizes and distribution of the polymer–protein CSNPs may be required. This work systematically studies the assembly process of poly(4-vinyl pyridine) and bovine serum albumin CSNPs. Average particle size was controlled by varying the concentrations of each reagent. Particle size and size distributions were monitored by dynamic light scattering, ultra-small-angle X-ray scattering, small-angle X-ray scattering and transmission electron microscopy. Results showed a wide range of CSNPs could be assembled ranging from an average radius as small as 52.3 nm, to particles above 1 µm by adjusting reagent concentrations. In situ X-ray scattering techniques monitored particle assembly as a function of time showing the initial particle growth followed by a decrease in particle size as they reach equilibrium. The results outline a general strategy that can be applied to other CSNP systems to better control particle size and distribution for various applications.

Tunable core–shell nanoparticles: macro-RAFT mediated one pot emulsion polymerization

RSC Advances ◽  
2014 ◽  
Vol 4 (5) ◽  
pp. 2382-2388 ◽  
Author(s):  
Niranjan Yeole ◽  
S. N. Raju Kutcherlapati ◽  
Tushar Jana
Keyword(s):  
Emulsion Polymerization ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Core Shell Nanoparticles

One-pot formation of monodisperse polymer@SiO2 core–shell nanoparticles via surfactant-free emulsion polymerization using an adaptive silica precursor polymer

2017 ◽  
Vol 8 (40) ◽  
pp. 6263-6271 ◽  
Author(s):  
Yongliang Zhao ◽  
Haitao Wang ◽  
Xiaomin Zhu ◽  
Martin Möller
Keyword(s):  
Emulsion Polymerization ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Precursor Polymer ◽  
New Type ◽  
Silica Precursor ◽  
Core Shell Nanoparticles

Monodisperse PMMA@SiO2 core–shell nanoparticles are formed via a new type of surfactant-free emulsion polymerization using polyethoxysiloxane as a silica precursor.

scholarly journals Preparation and Properties of PTFE-PMMA Core-Shell Nanoparticles and Nanocomposites

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Diego Antonioli ◽  
Michele Laus ◽  
Giampaolo Zuccheri ◽  
Valerj Kapeliouchko ◽  
Maria Cristina Righetti ◽  
...  
Keyword(s):  
Particle Size ◽  
Core Shell ◽  
Seeded Emulsion Polymerization ◽  
Shell Nanoparticles ◽  
Precise Control ◽  
Seed Particles ◽  
Wide Compositional Range ◽  
Shell Forming ◽  
Shell Particles ◽  
Core Shell Nanoparticles

The preparation of polytetrafluoroethylene-poly(methyl methacrylate) (PTFE-PMMA) core-shell particles was described, featuring controlled size and narrow size distribution over a wide compositional range, through a seeded emulsion polymerization starting from a PTFE seed of 26 nanometers. Over the entire MMA/PTFE range, the particle size increases as the MMA/PTFE ratio increases. A very precise control over the particle size can be exerted by properly adjusting the ratio between the monomer and the PTFE seed. Particles in the 80–240 nm range can be prepared with uniformity indexes suited to build 2D and 3D colloidal crystals. These core-shell particles were employed to prepare nanocomposites with different compositions, through an annealing procedure at a temperature higher than the glass transition temperature of the shell forming polymer. A perfect dispersion of the PTFE particles within the PMMA matrix was obtained and optically transparent nanocomposites were prepared containing a very high PTFE amount.

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