Preparation of Highly Charged, Monodisperse Nanospheres

Zeng, Fang; Sun, Zhaohua; Wu, Shuizhu; Liu, Xinxing; Wang, Chaoyang; Tong, Zhen

doi:10.1002/1521-3935(20020301)203:4<673::aid-macp673>3.0.co;2-s

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…The presence of even a small amount of SS improves the uniformity in size of the particles. According to Kim et al 15 and confirmed by Zeng et al, 17 nucleation occurs with the oligomers formed by the charged comonomer in the aqueous phase. Similar to the classic emulsion polymerization where the nucleation happens in the micelles, the styrene monomers diffuse from the droplets to these oligomers becoming less water-soluble as more styrene reacts.…”

Section: Resultsmentioning

confidence: 86%

“…Surfactant-free emulsion polymerization 15,17 was simplified for the preparation of the particles. No buffer, salt or co-solvent was added and the monomers were all introduced together in one single step.…”

Section: Resultsmentioning

confidence: 99%

“…Our results with SS agree well with the works already published. [14][15][16][17][18] A larger amount of SS helped decrease the mean diameter by stabilizing the particles surface as a result of the electrostatic repulsions, preventing their coagulation during the synthesis. The presence of even a small amount of SS improves the uniformity in size of the particles.…”

Section: Resultsmentioning

confidence: 99%

“…13 Surfactant-free emulsion polymerization with anionic comonomers has been extensively studied. [14][15][16][17][18][19] Krieger and Hiltner studied the order/disorder transition of negatively-charged latexes depending on the particle concentration and ionic strength, showing that they can form non-close-packed structures. 20,21 Anionic polystyrene particles have been used as the ideal candidate in the study of the diffraction properties of CCAs.…”

Section: Introductionmentioning

confidence: 99%

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Formation of crystalline colloidal arrays by anionic and cationic polystyrene particles

Bazin

Zhu

2010

Soft Matter

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Cross-linked polystyrene microspheres bearing positive and negative charges have been prepared by surfactant-free emulsion polymerization by the use of various amounts of vinylbenzyltrimethylammonium chloride and sodium styrenesulfonate as comonomers, respectively. Increasing the amount of the ionic comonomers tends to decrease the particle size due to better surface stabilization, but a high concentration of an ionic comonomer leads to a competitive mechanism that increases the polydispersity of the particle size. The amount of cationic and anionic comonomers leads to differences in size, shape and uniformity of the particles. The cationic particles can self-assemble into crystalline colloidal arrays with intense visible light diffraction just like the anionic ones. It is particularly interesting to observe that good packing can be obtained even for particles not quite uniform in size. To better understand the packing behavior, the properties and stability of the colloidal crystals have been studied as a function of the particle concentration and ionic strength of the media. The presence of charges helps in the formation of periodic structure over a wide range of particle concentrations at low ionic strength.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of crystalline colloidal arrays by anionic and cationic polystyrene particles

Bazin

Zhu

2010

Soft Matter

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“…The poly(St-co-NaSS) colloidal particles were prepared with the method similar to the procedure published by Sunkara et al 32 and Zeng et al 33 Uniform particles were obtained from this two-stage copolymerization method in a mixture of water and acetone and the particles packed well to form a CCA (Figure 1). The average diameter of the particles was determined to be 199 nm by dynamic light scattering (DLS) and 185 nm by scanning electron microscopy (SEM) (Figures 1 and 2), respectively.…”

Section: Resultsmentioning

confidence: 99%

The diffraction behavior of crystalline colloidal arrays formed by poly(styrene-co-sodium styrenesulfonate) particles

Ni¹,

Wang²,

Bazin³

et al. 2021

Arkivoc

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Colloidal particles were prepared by the surfactant-free emulsion copolymerization of styrene and sodium styrene sulfonate crosslinked with divinyl benzene. The mono-dispersed and highly surface-charged spherical particles self-assembled into three-dimensional crystalline colloidal arrays (CCA) in water. The CCA showed Bragg diffraction in the visible light wavelength range. Two diffraction peaks were observed in the range of 350~1000 nm for the CCAs at various particle concentrations. The two peaks shifted to longer wavelengths upon dilution of the colloids corresponding to increasing inter-particle distance. The red shift was accompanied by a gradual decrease in the intensity for the diffraction peak at the lower wavelength and an increase in the intensity of the peak at the higher wavelength.

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Preparation of colloidal crystals with polyhedral building blocks through post-polymerization

Zeng

Tang

et al. 2004

Colloid & Polymer Science

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Preparation of Highly Charged, Monodisperse Nanospheres

Cited by 15 publications

References 14 publications

Formation of crystalline colloidal arrays by anionic and cationic polystyrene particles

Formation of crystalline colloidal arrays by anionic and cationic polystyrene particles

The diffraction behavior of crystalline colloidal arrays formed by poly(styrene-co-sodium styrenesulfonate) particles

Preparation of colloidal crystals with polyhedral building blocks through post-polymerization

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