Synthesis of Novel Cross-Linked Fluorinated Cooligomeric Nanoparticles: Synthetic Approach to Colloidal Stable Fluorinated Magnetic Nanocomposites

Yoshioka, Hiroaki; Narumi, Tamikazu; Sawada, Hideo

doi:10.5650/jos.56.377

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Fluoroalkanoyl peroxides reacted with the dimethylacrylate monomer containing poly(oxyethylene) units and acrylic acid to afford cross-linked fluoroalkyl end-capped cooligomeric nanoparticles without the formation of gels (see Scheme 3). 74 These cross-linked fluorinated cooligomeric particles were nanometre size-controlled (42-363 nm) fine particles, and exhibited a good dispersibility and stability in a variety of common organic solvents including water. We can use a variety of fluoroalkanoyl peroxides possessing shorter (n ¼ 0; m ¼ 2, 3) or longer (n ¼ 1) perfluorooxaalkyl groups [R F ¼ CF(CF 3 ) {OCF 2 CF(CF 3 )} n O(CF 2 ) m CF 3 ; n ¼ 0, 1; m ¼ 2, 3] for the preparation of cross-linked fluorinated cooligomeric nanoparticles, as shown in Scheme 3.…”

Section: Synthesis Of Fluoroalkyl End-capped Oligomersmentioning

confidence: 99%

Preparation and applications of novel fluoroalkyl end-capped oligomeric nanocomposites

Sawada

2012

Polym. Chem.

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Section: Synthesis Of Fluoroalkyl End-capped Oligomersmentioning

confidence: 99%

Preparation and applications of novel fluoroalkyl end-capped oligomeric nanocomposites

Sawada

2012

Polym. Chem.

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“…In fact, we have already reported that fluoroalkyl end-capped oligomers containing not only carboxyl groups but also other functional groups such as phosphonic acid, sulfonic acid and sulfobetaine-type groups can interact effectively with the residual hydroxyl groups on the magnetite surface to form new fluorinated magnetic nanocomposites with good dispersibility in a variety of solvents, including water. [33][34][35][36] Such good dispersibility of tailored magnetic fluorinated polymer colloids is due to the presence of fluoroalkyl end-capped oligomers because fluoroalkyl end-capped oligomers can exhibit various unique properties such as high solubility, surface active properties, biological activities and nanometer scale self-assembled molecular aggregates, which cannot be achieved by the corresponding nonfluorinated, randomly fluoroalkylated and AB block-type fluoroalkylated polymers. [37][38][39][40] With regard to these fluoroalkyl end-capped oligomers, we have very recently found that crosslinked fluoroalkyl end-capped co-oligomers containing both oxime-blocked isocyanato and hydroxy adamantyl segments can form new crosslinked fluoroalkyl end-capped co-oligomeric nanoparticles containing adamantane segments through the deprotecting reaction of oxime-blocked isocyanato segments in co-oligomers.…”

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Selective preparation of novel fluoroalkyl end-capped co-oligomeric nanocomposite-encapsulated magnetites and magnetite-adsorbing co-oligomeric nanoparticles

Sawada

Kijima

Mugisawa

2010

Polym J

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New crosslinked fluoroalkyl end-capped co-oligomeric nanocomposite-encapsulated magnetic nanoparticles, prepared by the deprotecting reactions of corresponding fluorinated co-oligomers containing oxime-blocked segments in the presence of magnetic nanoparticles, were produced with nanometer-scale diameters (with diameters in the range of 154-192 nm). The nanoparticles exhibited good dispersibility in traditional organic solvents. They were applied as a surface modification to poly(methyl methacrylate), resulting in good oleophobicity imparted by the fluorine and magnetic properties arising from the encapsulated magnetic nanoparticles. Fluoroalkyl end-capped 2-acrylamido-2-methylpropanesulfonic acid co-oligomers containing adamantane segments form nanometer-sized controlled fine particles in methanol and can interact with magnetic nanoparticles to form fluorinated betaine-type co-oligomeric nanocomposite-encapsulated magnetic nanoparticles (with an average particle size of 25-183 nm). These fluorinated betaine-type nanocomposite-encapsulated magnetic nanoparticles exhibit the lower critical solution temperature (LCST) characteristic in organic media such as t-butyl alcohol and were found to effectively decrease the LCST through the encapsulation of magnetic nanoparticles in fluorinated co-oligomeric nanoparticle cores. Interestingly, transmission electron microscopy images show that magnetic nanoparticles can be encapsulated inside the crosslinked fluorinated co-oligomeric nanocomposite cores; in contrast, magnetic nanoparticles are adsorbed on the surface of fluorinated betaine-type co-oligomeric nanocomposite cores. Polymer Journal (2010) 42, 494-500; doi:10.1038/pj.2010.27; published online 21 April 2010Keywords: adsorption; encapsulation; fluorinated co-oligomeric nanoparticle; LCST; magnetite; surface modification; TEM INTRODUCTION Much attention has been devoted recently to well-dispersed magnetic colloidal particles, owing to the broad range of potential applications in the fields of ferrofluids, 1,2 high-density data storage, 3 disks and toner in printing, 4-6 magnetic resonance imaging, 7,8 enzyme immobilization, 9 rapid biological separation, 10,11 drug delivery, 12-14 biomedical materials, 15-17 immunoassays 18,19 and biosensors. 20,21 The development of colloidal-stable magnetic nanoparticles is essential from a practical point of view. The surface functionality of magnetic nanoparticles with functionalized polymers can form colloidal-stable magnetic nanoparticles. So far, numerous synthetic and natural polymers have been used to obtain stable colloidal dispersions of magnetic nanoparticles by coating and encapsulating the particles. [22][23][24][25][26][27][28][29][30][31] It is well known that fluorinated surfactants have excellent surface characteristics, including oleophobicity and hydrophobicity, neither of which can be achieved with corresponding nonfluorinated polymers. 32 Thus, it is of particular interest to develop new, tailored magnetic fluorinated polymer colloids that possess not only goo...

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Preparation of novel cross-linked fluoroalkyl end-capped cooligomeric nanoparticles–encapsulated cytochrome c in water and ionic liquids

Okada

Sawada

2009

Colloid Polym Sci

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Synthesis of Novel Cross-Linked Fluorinated Cooligomeric Nanoparticles: Synthetic Approach to Colloidal Stable Fluorinated Magnetic Nanocomposites

Cited by 7 publications

References 27 publications

Preparation and applications of novel fluoroalkyl end-capped oligomeric nanocomposites

Preparation and applications of novel fluoroalkyl end-capped oligomeric nanocomposites

Selective preparation of novel fluoroalkyl end-capped co-oligomeric nanocomposite-encapsulated magnetites and magnetite-adsorbing co-oligomeric nanoparticles

Preparation of novel cross-linked fluoroalkyl end-capped cooligomeric nanoparticles–encapsulated cytochrome c in water and ionic liquids

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