Anomalous Small-angle X-ray Scattering Study on Aggregation of a Block Copolymer in a Selective Solvent

Sakou, Megumi; Takechi, Atsuro; Handa, Masashi; Shinohara, Yuya; Amemiya, Yoshihito; Masunaga, Hiroyasu; Ogawa, Hiroki; Yagi, Naoto; Sakurai, Kazuo; Akiba, Isamu

doi:10.1088/1742-6596/272/1/012022

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…ASAXS analyses have been applied for visualization of spatial distribution of a targeted element in nano-sized particles, such as metal nanoparticles, polymer micelles, and so forth [10][11][12][13][14][15][16][17][18][19][20][21][22]. Therefore, by using ASAXS for polymer micelles incorporating model drug compounds labeled with a marker element, we expect to visualize the 4 spatial distributions of drug compounds in polymer micelles.…”

Section: Introductionmentioning

confidence: 99%

“…As written below, I(q) must be compared for the same value of q in ASAXS analyses, although the change in energy of incident X-ray led to a shift in the q-value assigned to a given pixel of the detector. Then, the SAXS profiles were interpolated by means of a cubic-spline method without any smoothing or corrections to correct for the q-shift [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Spatial distribution of hydrophobic compounds in polymer micelles as explored by anomalous small-angle X-ray scattering near Br K-edge

Nakanishi

Kinoshita

Sasaki

et al. 2016

European Polymer Journal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial distribution of hydrophobic compounds in polymer micelles as explored by anomalous small-angle X-ray scattering near Br K-edge

Nakanishi

Kinoshita

Sasaki

et al. 2016

European Polymer Journal

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“…First of all, the fitting analysis is attempted for the SAXS profile using the simple core−shell model, in which radial density distribution in the swollen shell is assumed to be constant, without considering the ASAXS result. The form factor of the core−shell model is given by following equation: 35,42 ρ ρ…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Anomalous Small-Angle X-ray Scattering Study of Structure of Polymer Micelles Having Bromines in Hydrophobic Core

et al. 2012

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Anomalous small-angle X-ray scattering (ASAXS) near the absorption edge of bromine has been used to investigate the internal structure of polymer micelles comprising poly(4-bromostyrene)-block-poly(ethylene glycol)block-poly(4-bromostyrene) (PBrS-b-PEG-b-PBrS) in aqueous solution. The ASAXS analysis revealed that the hydrophobic core composed of PBrS can be regarded as a homogeneous sphere with a radius of 10.2 nm and a decaying electron density at the surface. The aggregation number of micelle directly estimated on the basis of ASAXS analysis well agreed with that determined by field-flow fractionation coupled with multiangle light scattering, confirming the reliability of ASAXS analysis. The small-angle X-ray scattering (SAXS) profile from whole PBrS-b-PEG-b-PBrS micelle was further analyzed by using the result of ASAXS analysis. The micelles could be well described by a core−corona model in which the monomer concentration of PEG in the shell decreased as R −4.2/3 , where R is the distance from the center of micelle. The index 4.2/3 is very close to that predicted by theory for star polymers (R −4/3 ), indicating that the PEG chains in the shell can be well described by the blob model in which chains are modeled as strings of blobs that extend radially. Thus, combination of ASAXS and conventional SAXS analyses permit to reveal precisely the internal structure and nature of the tethered chains of polymer micelles, and it could become a powerful tool for exploring internal structures of multiphase systems when they contain a probe atom for ASAXS.

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“…They developed an analysis method to derive the partial scattering functions of the polymer and the nanoparticle phases which could be also suitable for other composite materials. In a more recent work, Sakou et al [43] exploited ASAXS for probing the core-shell morphology of a block copolymer with bromostyrene as one of the blocks in a selective solvent. In this case, bromostyrene forms the core of the micelle and ASAXS near bromine K-edge allowed them to derive detailed information on the core-corona interface.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

Anomalous small-angle X-ray scattering from charged soft matter

Sztucki

Cola

Narayanan

2012

Eur. Phys. J. Spec. Top.

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Abstract. A review of recent applications of Anomalous Small-Angle X-ray Scattering (ASAXS) to charged soft matter systems is presented. Although the potential of ASAXS was realized in the eighties [1], applications to soft matter systems became feasible in recent years thanks to the technical developments at the synchrotron sources. Examples include both stiff chain and flexible polyelectrolytes, colloidal brush-like polyelectrolytes, DNA, RNA, and polysaccharides where the counterion profile could be determined with high precision and compared with theoretical models. In addition, ASAXS has also been found useful for microstructure characterization in soft materials. Finally, the present capability for ASAXS studies is illustrated by an example involving a surfactant micellar system.

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Anomalous Small-angle X-ray Scattering Study on Aggregation of a Block Copolymer in a Selective Solvent

Cited by 6 publications

References 7 publications

Spatial distribution of hydrophobic compounds in polymer micelles as explored by anomalous small-angle X-ray scattering near Br K-edge

Spatial distribution of hydrophobic compounds in polymer micelles as explored by anomalous small-angle X-ray scattering near Br K-edge

Anomalous Small-Angle X-ray Scattering Study of Structure of Polymer Micelles Having Bromines in Hydrophobic Core

Anomalous small-angle X-ray scattering from charged soft matter

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