One‐Pot Preparation of Organic–Inorganic Composite Microspheres Comprising Silica Nanoparticles and End‐Functionalized Polymers

Satoh, Hiroki; Yabu, Hiroshi

doi:10.1002/mame.201500338

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…Particles with structures similar to compound eyes can also be prepared from silica nanoparticles and core–shell polymer microspheres . Periodic arrays of dielectric materials can function as photonic crystals that reflect specific wavelengths of light, and so these particles can be useful as colored materials that do not undergo photobleaching.…”

Section: Applications Of Nanostructured Composite Microspheresmentioning

confidence: 87%

“…Typically, it is employed to produce core–shell type phase separated microspheres, and unique structures can be obtained by employing anisotropic microspheres such as Janus particles. Figure presents a scanning electron microscopy (SEM) image of composite particles comprising negatively charged silica microspheres and Janus microspheres, the hemispheres of which are covered with positively charged amino groups . The electrostatic interactions between the silica particles and the positively charged hemispheres of the Janus microspheres ensure that only one side of each microsphere is coated with silica particles.…”

Section: Composite Microspheresmentioning

confidence: 99%

“…SEM images of composite microspheres made of a) a silica nanoparticles/polymer composite and b) a silica nanoparticles/Janus microsphere composite. Reproduced with permission . Copyright 2015, Wiley‐VCH.…”

Section: Composite Microspheresmentioning

confidence: 99%

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

Yabu

2019

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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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Section: Applications Of Nanostructured Composite Microspheresmentioning

confidence: 87%

Section: Composite Microspheresmentioning

confidence: 99%

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

Yabu

2019

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“…Yabu et al implemented methods for precipitation of polymer solutions such as self-organized precipitation and coprecipitation methods to fabricate core-shell structures of nanoparticles (NPs) (shell) immobilized onto Janus polymeric particles (core) [42,43,44,45,46,47,48]. Different types of particles were immobilized by this method such as, Au [45], Fe 3 O 4 [43,44,46], SiO 2 [42], and TiO 2 [43].…”

Section: Introductionmentioning

confidence: 99%

A Robust Fabrication Method for Amphiphilic Janus Particles via Immobilization on Polycarbonate Microspheres

et al. 2018

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Immobilizing particles on beads, fibers, or filaments, when only one side is exposed to the reaction medium and therefore can be selectively functionalized, is a scalable and easy to control strategy for the fabrication of amphiphilic Janus particles. Here we describe a new, robust method for the fabrication of amphiphilic Janus particles based on immobilization of polymethylsilsesquioxane (PMSQ) particles on polycarbonate (PC), a high impact-resistance polymer with superior mechanical properties. The immobilization of the particles on the PC microspores is performed via inverse solvent displacement method. PMSQ particles are added to a PC solution in tetrahydrofuran (THF), a good solvent for PC. The solution is then precipitated by the introduction of aqueous surfactant solution (antisolvent for PC) under an ultrasonic field. It is important to note that THF and water are miscible and do not form emulsion. During precipitation, PMSQ particles are assembled onto the surface of the PC spherical precipitates/microspheres. The exposed hemispheres of the PMSQ particles are then selectively silanized by (3-Aminopropyl)triethoxysilane (APTES) to introduce amine groups on their surface. To increase the polarity of the functionalized hemispheres, the amine groups are further modified to introduce carboxyl groups. SEM characterization confirms the fine embedment of PMSQ particles onto the PC microspheres. Covalent attachment of silica nanoparticles (NPs) to the functionalized hemispheres of the resulting particles along with fluorescent confocal microscopy conclusively prove the successful fabrication of amphiphilic Janus particles. The immobilization of particles onto highly rigid polymeric microspheres such as PC may pave the way for the development of a robust fabrication procedure with high resistance to temperature fluctuations and harsh mixing conditions that can arise during preparation. This method can be implemented toward a large variety of other synthetic commercial polymers such as polyamide, polyether sulfones, Polyether, ether ketone, or similar.

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“…Yabu et al, implemented methods for precipitation of polymer solutions such as self-organized precipitation and co-precipitation methods to fabricate core-shell structures of nanoparticles (shell) immobilized onto Janus polymeric particles (core) [38][39][40][41][42][43][44]. Different types of particles were immobilized by this method such as, Au This study presents a new, robust and rapid approach for the fabrication of amphiphilic Janus particles based on the immobilization of PMSQ particles onto PC microspheres via inverse solvent displacement method [45,46].…”

Section: Introductionmentioning

confidence: 99%

A Robust Fabrication Method for Amphiphilic Janus Particles via Immobilization on Polycarbonate Microspheres

Mani

Yaakov

Alkotzer

et al. 2018

Preprint

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Immobilizing particles on beads, fibers or filaments, when only one side is exposed to the reaction medium and therefore can be selectively functionalized, is a scalable and easy to control strategy for the fabrication of amphiphilic Janus particles. Here we describe a new, robust method for the fabrication of amphiphilic Janus particles based on immobilization of polymethylsilsesquioxane (PMSQ) particles on polycarbonate (PC), a high impact-resistance polymer with superior mechanical properties. The immobilization of the particles on the PC microspores is preformed via inverse solvent displacement method. PMSQ particles are added to a PC solution in tetrahydrofuran (THF), a good solvent for PC. The solution is then precipitated by the introduction of aqueous surfactant solution (anti solvent for PC) under an ultrasonic field. It is important to note that THF and water are miscible and do not form emulsion. During precipitation, PMSQ particles are assembled onto the surface of the PC spherical precipitates/microspheres. The exposed hemispheres of the PMSQ particles are then selectively silanized by (3-Aminopropyl)triethoxysilane (APTES) to introduce amine groups on their surface. To increase the polarity of the functionalized hemispheres, the amine groups are further modified to introduce carboxyl groups. SEM characterization confirms the fine embedment of PMSQ particles onto the PC microspheres. Covalent attachment of silica nanoparticles (NPs) to the functionalized hemispheres of the resulting particles along with fluorescent confocal microscopy conclusively proof the successful fabrication of amphiphilic Janus particles. The immobilization of particles onto highly rigid polymeric microspheres such as PC may pave the way to the development of a robust fabrication procedure with high resistance to temperature fluctuations and harsh mixing conditions that can arise during preparation. This method can be implemented toward a large variety of other synthetic commercial polymers such as polyamide, polyether sulfones, Polyether ether ketone or similar.

show abstract

One‐Pot Preparation of Organic–Inorganic Composite Microspheres Comprising Silica Nanoparticles and End‐Functionalized Polymers

Cited by 8 publications

References 25 publications

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

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

A Robust Fabrication Method for Amphiphilic Janus Particles via Immobilization on Polycarbonate Microspheres

A Robust Fabrication Method for Amphiphilic Janus Particles via Immobilization on Polycarbonate Microspheres

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