Synthesis of polystyrene nanoparticles with monodisperse size distribution and positive surface charge using metal stearates

Abstract

Polystyrene (PS) nanospheres with a monodisperse size distribution, positive surface charge and high molecular weight were successfully synthesized using various types of metal stearates in an aqueous NaOH medium. The diameter of the PS nanospheres was controlled from 80 to 450 nm by changing the type of metal stearate. It was also found that controlling the NaOH concentration in solution was important for producing monodisperse PS nanoparticles. The nanospheres prepared with zinc stearate possessed a positive surface charge of 60 to 80 mV, confirming that PS particles were functionalized with metal stearates. It is believed that the metal stearates provide PS particles with not only colloidal stability but also a positive surface charge.

Are Fluoropolymers Really of Low Concern for Human and Environmental Health and Separate from Other PFAS?

“…71,72 Furthermore, Geiser et al showed that inhaled spherical microparticles of Teflon were able to migrate into the surface lining layer of hamster alveoli, where interactions with lung cells could occur 73. Many fluoropolymer substances are marketed in the form of suspensions with submicron fluoropolymer particle sizes (see, e.g.…”

Solid Polymer Electrolytes Derived from Crosslinked Polystyrene Nanoparticles Covalently Functionalized with a Low Lattice Energy Lithium Salt Moiety

“…PEGDM, PEO, and PSLS were mixed in a mortar and pestle. The mixture was then placed in between two Teflon coated sheets, then hot pressed in a Carver press at 100 • C under 10 psi pressure for 5 min [21]. The resulting SPE film was then folded, refolded, and subjected to further hot pressing to achieve a well-dispersed electrolyte film.…”

“…(a) Scanning electron microscopy (SEM) of the PS nanoparticles, where the diameter of the particles was around 50 nm; (b) SEM of the PSTFSILi nanoparticles, where the diameter of the particles was around 500 nm; (c) SEM of the PSPhSILi nanoparticles, where the diameter of the particles was around 500 nm; (d) SEM of the PSDTTOLi nanoparticles, where the diameter of the particles was around 350 nm[21,25].…”

Preparation of Polystyrene-Polyetherimide Core-Shell Particles by Dispersion Polymerization

“…단분산성 고분자 입자는 최근 의료용 진단, 약물전달 시스템, 및 전 자 소재, 광결정 등의 여러 분야에서 응용이 연구되고 있다 [1][2][3][4][5]. 단분 산성 고분자 입자는 유화중합, 분산중합 등에 의해 합성될 수 있는데, 0.5∼10 µm 크기의 단분산성 고분자 입자는 주로 분산중합의 의해 제조된다 [6].…”