A Comparative Study of Dynamic Light and X-ray Scatterings on Micelles of Topological Polymer Amphiphiles

Ree, Brian J.; Lee, Jong-Chan; Satoh, Yusuke; Kwon, Kyungho; Isono, Takuya; Satoh, Toshifumi; Ree, Moonhor

doi:10.3390/polym10121347

Cited by 22 publications

(13 citation statements)

References 45 publications

(75 reference statements)

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“…Therefore, we speculated that broad distribution in R h observed from 0.5 wt % C3Ms of G + S and G + C may be explained by aggregates of spherical micelles. For more detailed structure of the spherical micelles, small-angle X-ray/neutron scattering (SAX/NS) was performed [41,56,57,58]. (Note that SAXS analysis is described in Supporting Information, where the SAXS profiles are reproduced by the core-shell sphere model in Figure S6 and Table S2)…”

Section: Resultsmentioning

confidence: 99%

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

et al. 2019

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Pairs of ionic group dependence of the structure of a complex coacervate core micelle (C3M) in an aqueous solution was investigated using DLS, cryo-TEM, and SANS with a contrast matching technique and a detailed model analysis. Block copolyelectrolytes were prepared by introducing an ionic group (i.e., ammonium, guanidinium, carboxylate, and sulfonate) to poly(ethylene oxide-b-allyl glycidyl ether) (NPEO = 227 and NPAGE = 52), and C3Ms were formed by simple mixing of two oppositely-charged block copolyelectrolyte solutions with the exactly same degree of polymerization. All four C3Ms are spherical with narrow distribution of micelle dimension, and the cores are significantly swollen by water, resulting in relatively low brush density of PEO chains on the core surface. With the pair of strong polyelectrolytes, core radius and aggregation number increases, which reflects that the formation of complex coacervates are significantly sensitive to the pairs of ionic groups rather than simple charge pairing.

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Section: Resultsmentioning

confidence: 99%

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

et al. 2019

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“…X-ray scattering measurements were conducted at the 4C beamline [32,44,45,57] of the PLS-II facility (third-generation synchrotron facility of 3.0 GeV power), Pohang Accelerator Laboratory (Pohang, Korea). The X-ray beam with a wavelength λ of 0.07336 nm was used.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 2a-1 shows a representative second order autocorrelation function g 2 (q,t) constructed from the fluctuating scattered intensity I s (q,t) data measured at a fixed scattering angle of 90 • as a function of time. From the g 2 (q,t) profile, the first order autocorrelation function g 1 (q,t) (i.e., field autocorrelation function) has been extracted by using the Siegert relation [32,62,63] and then analyzed using the Malvern Zetasizer analysis software package based on the cumulant method and the non-negatively constrained least square (NNLS) deconvolution algorithm; the DLS data analysis details are given in Supporting Materials. Although the Cumulant algorithm always assumes monodispersed size distribution, interestingly it fits the g 1 (q,t) profile (Figure 2b-1), providing information on the hydrodynamic radius and polydispersity of the particle.…”

Section: Ps-1mentioning

confidence: 99%

“…To measure nanoparticle size, dynamic light scattering is currently used most widely because of the experimental simplicity and automatized data analysis scheme using the instruments developed in compact type [21][22][23][24][25][26]. However, dynamic light scattering very often provides unrealistically large size and distribution [27][28][29][30][31][32][33][34]. Electron microscopy is also widely used to characterize nanoparticles, but always requires specific measurement conditions such as dried or freeze samples and vacuum environment [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

“…There are several other methods available, including X-ray scattering, static light scattering, laser diffraction, neutron scattering, fluorescence correlation spectroscopy, sedimentation, sieving, optical particle counting, electrozone sensing, and resistive pulse sensing [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. However, the individual methods have some disadvantages including detection limit and valid boundary condition, leading to differences even in the size of nanoparticle [28,32,33,40,43,49,50,[53][54][55][56]. Furthermore, they often face difficulties in analyzing measured data mathematically in a quantitative manner.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative Structural Analysis of Polystyrene Nanoparticles Using Synchrotron X-ray Scattering and Dynamic Light Scattering

Wong

Ngoi

et al. 2020

Polymers

Self Cite

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A series of polystyrene nanoparticles (PS-1, PS-2, PS-3, and PS-4) in aqueous solutions were investigated in terms of morphological structure, size, and size distribution. Synchrotron small-angle X-ray scattering analysis (SAXS) was carried out, providing morphology details, size and size distribution on the particles. PS-1, PS-2, and PS-3 were confirmed to behave two-phase (core and shell) spherical shapes, whereas PS-4 exhibited a single-phase spherical shape. They all revealed very narrow unimodal size distributions. The structural parameter details including radial density profile were determined. In addition, the presence of surfactant molecules and their assemblies were detected for all particle solutions, which could originate from their surfactant-assisted emulsion polymerizations. In addition, dynamic light scattering (DLS) analysis was performed, finding only meaningful hydrodynamic size and intensity-weighted mean size information on the individual PS solutions because of the particles’ spherical nature. In contrast, the size distributions were extracted unrealistically too broad, and the volume- and number-weighted mean sizes were too small, therefore inappropriate to describe the particle systems. Furthermore, the DLS analysis could not detect completely the surfactant and their assemblies present in the particle solutions. Overall, the quantitative SAXS analysis confirmed that the individual PS particle systems were successfully prepared with spherical shape in a very narrow unimodal size distribution.

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Morphology Transformation Pathway of Block Copolymer‐Directed Cooperative Self‐Assembly of ZnO Hybrid Films Monitored In Situ during Slot‐Die Coating

Tian

Yin

et al. 2021

Adv Funct Materials

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Cooperative self-assembly (co-assembly) of diblock copolymers (DBCs) and inorganic precursors that takes inspiration from the rich phase separation behavior of DBCs can enable the realization of a broad spectrum of functional nanostructures with the desired sizes. In a DBC assisted sol-gel chemistry approach with polystyrene-block-poly(ethylene oxide) and ZnO, hybrid films are formed with slot-die coating. Pure DBC films are printed as control. In situ grazing-incidence small-angle X-ray scattering measurements are performed to investigate the self-assembly and co-assembly process during the film formation. Combining complementary ex situ characterizations, several distinct regimes are differentiated to describe the morphological transformations from the initially solvent-dispersed to the ultimately solidified films. The comparison of the assembly pathway evidences that the key step in the establishment of the pure DBC film is the coalescence of spherical micelles toward cylindrical domains. Due to the presence of the phase-selective precursor, the formation of cylindrical aggregates in the solution is crucial for the structural development of the hybrid film. The pre-existing cylinders in the ink impede the domain growth of the hybrid film during the subsequent drying process. The precursor reduces the degree of order, prevents crystallization of the PEO block, and introduces additional length scales in the hybrid films.

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A Comparative Study of Dynamic Light and X-ray Scatterings on Micelles of Topological Polymer Amphiphiles

Cited by 22 publications

References 45 publications

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

Quantitative Structural Analysis of Polystyrene Nanoparticles Using Synchrotron X-ray Scattering and Dynamic Light Scattering

Morphology Transformation Pathway of Block Copolymer‐Directed Cooperative Self‐Assembly of ZnO Hybrid Films Monitored In Situ during Slot‐Die Coating

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