Hierarchical assembly of CdS nanoparticles in polymer particles with phase separation structures

Yabu, Hiroshi; Endo, Akira; Koike, Kazutaka; Motoyoshi, Kiwamu; Higuchi, Takeshi; Shimomura, Masatsugu

doi:10.1038/pj.2010.137

Cited by 20 publications

(14 citation statements)

References 33 publications

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“…However, the problem of fast recombination of photo‐generated charge carriers and its low tolerance to photooxidation (i.e., CdS+2 h + →Cd 2+ +S) hampers its effective use. Efforts have been made to improve the photocatalytic efficiency of CdS‐based photocatalysts by controlling their morphology, depositing CdS nanoparticles on polymers/membranes, and constructing heterojunctions; however, stability enhancement has received considerably less attention. In a recent report, Reisner et al.…”

Section: Introductionsupporting

confidence: 52%

Photocatalytic Dehydrogenation of Formic Acid on CdS Nanorods through Ni and Co Redox Mediation under Mild Conditions

et al. 2018

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Selective release of hydrogen from formic acid (FA) is deemed feasible to solve issues associated with the production and storage of hydrogen. Here, we present a new efficient photocatalytic system consisting of CdS nanorods (NRs), Ni, and Co to liberate hydrogen from FA. The optimized noble-metal-free catalytic system employs Ni/Co as a redox mediator to relay electrons and holes from CdS NRs to the Ni and Co, respectively, which also deters the oxidation of CdS NRs. As a result, a high hydrogen production activity of 32.6 mmol h g from the decomposition of FA was noted. Furthermore, the photocatalytic system exhibits sustained H production rate for 12 h with sequential turnover numbers surpassing 4×10 , 3×10 , and 2×10 for Co-Ni/CdS NRs, Ni/CdS NRs, and CoCl /CdS NRs, respectively.

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Section: Introductionsupporting

confidence: 52%

Photocatalytic Dehydrogenation of Formic Acid on CdS Nanorods through Ni and Co Redox Mediation under Mild Conditions

et al. 2018

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“…67 By this technique, polymer-stabilized CdS nanoparticles have been prepared as composite particles with a PS/PI polymer blend system or PS-b-PI block copolymers. 68 Figure 14a shows a typical TEM image of CdS nanoparticles prepared in PS-b-PAA inversed micelles, and the fluorescence from differently sized CdS nanoparticles. CdS nanoparticles have also been incorporated into the PS phase of the composite particles (Figure 14b).…”

Section: Motivation Formentioning

confidence: 99%

Creation of Functional and Structured Polymer Particles by Self-Organized Precipitation (SORP)

Yabu

2012

Bulletin of the Chemical Society of Japan

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In this account, we review recent developments in the preparation of various functional and nanostructured polymer particles by precipitation-based methods. First, we present an overview of recent polymer particle preparation methods including methods for precipitation-based particle preparation. Next, we introduce the self-organized precipitation and its advantages. We discuss the morphological control of polymer particles based on the types of polymer materials used for particle preparation. We also introduce the preparation of organicinorganic composite particles. Finally, we discuss the future outlook of nanostructured polymer particles.

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“…CdS nanoparticles synthesized in amphiphilic block copolymer micelles have been introduced into a single phase of Janus microspheres and stacked lamellae microspheres, where they act as strong fluorescent dyes. In such cases, the amphiphilic block copolymer functions both to stabilize the nanoparticles and to increase the compatibility of the polymer phases in anisotropic polymer microspheres . Using this same strategy, fluorescent dyes and magnetic nanoparticles can be incorporated into Janus microspheres .…”

Section: Applications Of Nanostructured Composite Microspheresmentioning

confidence: 99%

Fabrication of Nanostructured Composite Microspheres Based on the Self‐Assembly of Polymers and Functional Nanomaterials

Yabu

2019

Part & Part Syst Charact

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Achieving the specific properties required for the applications discussed above necessitates control over the morphologies of the polymer particles as well as the precise alignment of functional nanoparticles at particle interiors and surfaces. Studies using seed polymerization and related so-called second generation particle preparation techniques have succeeded in preparing polymer microspheres having anisotropic morphologies. [10] These techniques for the synthesis of nonspherical polymer microparticles are both powerful and practical, although the particle shape has been found to be greatly affected by the preparation conditions employed. These conditions involve numerous parameters, and so controlling the particle morphology remains challenging. In addition to first and second generation particle preparation technologies employing emulsion polymerization, recent studies have demonstrated the fabrication of nanostructured microspheres based on the phase separation of polymers. [11,12] These methods can be considered as the third generation of progress in this field and allow the tuning of particle morphologies in association with phase separation theories developed during prior work with bulk polymer blends, alloys, and composites. The alignment of nanoparticles in phase separated polymer microspheres could lead to nanostructured particles with many practical applications. Figure 1 presents some of the many methods developed for the synthesis of polymer microspheres. This diagram indicates representative existing approaches used to obtain controlled particle sizes, as well as specific phases in the interior and at the surfaces of such microspheres, and can be divided into two main categories; top-down and bottom-up. These two types of procedures differ with regard to the process used to form internal and surface structures. The polymerization or crosslinking of uniformly sized oil/water (O/W) or water/oil (W/O) emulsion droplets formed by microfluidic devices is a well-known topdown fabrication technique used to produce structured polymer microspheres with sizes on the scale of tens of micrometers. [13] Taking advantage of the laminar flow inside narrow capillaries, multiple phases can be formed in the interiors of the emulsion droplets, resulting in the formation of multiphase polymer microspheres. [14] In contrast, in the case of bottom-up approaches, the phase separation of polymers is used to create internal and surface nanostructures. The latter methods have received considerable attention because they permit size control on a variety of size scales as well as morphological tuning. [15] This Review examines recent developments in the morphological control of polymer microspheres fabricated via the phase separation of polymers as well as the alignment of functional nanoparticles inside microspheres prepared by so-called bottom-up synthesis techniques. Several methods for adjusting the internal and surface morphologies of polymer microspheres based on the phase separation of polymer blends and block copoly...

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Hierarchical assembly of CdS nanoparticles in polymer particles with phase separation structures

Cited by 20 publications

References 33 publications

Photocatalytic Dehydrogenation of Formic Acid on CdS Nanorods through Ni and Co Redox Mediation under Mild Conditions

Photocatalytic Dehydrogenation of Formic Acid on CdS Nanorods through Ni and Co Redox Mediation under Mild Conditions

Creation of Functional and Structured Polymer Particles by Self-Organized Precipitation (SORP)

Fabrication of Nanostructured Composite Microspheres Based on the Self‐Assembly of Polymers and Functional Nanomaterials

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