Janus particles: from synthesis to application

Poggi, Elio; Gohy, Jean‐François

doi:10.1007/s00396-017-4192-8

Cited by 106 publications

(70 citation statements)

References 300 publications

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“…The resulting asymmetry provides an opportunity to encode them with properties [3][4][5][6] such as controlled motion or actuation, or to direct their self-assembly into complex superstructures [7][8][9][10][11][12] . A wide variety of preparation methods exist to build such particles with micrometer dimensions, but it is still a great synthetic challenge to prepare nanometric Janus particles, in particular with nonspherical shapes 13 . Moreover, the only known approaches 14,15 to form polymeric Janus nanorods are limited to highly incompatible polymers.…”

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confidence: 99%

Straightforward preparation of supramolecular Janus nanorods by hydrogen bonding of end-functionalized polymers

et al. 2020

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Janus cylinders are one-dimensional colloids that have two faces with different compositions and functionalities, and are useful as building blocks for advanced functional materials. Such anisotropic objects are difficult to prepare with nanometric dimensions. Here we describe a robust and versatile strategy to form micrometer long Janus nanorods with diameters in the 10-nanometer range, by self-assembly in water of end-functionalized polymers. The Janus topology is not a result of the phase segregation of incompatible polymer arms, but is driven by the interactions between unsymmetrical and complementary hydrogen bonded stickers. Therefore, even compatible polymers can be used to form these Janus objects. In fact, any polymers should qualify, as long as they do not prevent co-assembly of the stickers. To illustrate their applicative potential, we show that these Janus nanorods can efficiently stabilize oil-in-water emulsions.

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confidence: 99%

Straightforward preparation of supramolecular Janus nanorods by hydrogen bonding of end-functionalized polymers

et al. 2020

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“…[ 17–20 ] Up to now, a couple of strategies have been developed for the synthesis of Janus structures, including self‐assembly approach, masking and phase separation method. [ 21,22 ] Although many different Janus structures have been fabricated in bulk solutions, no Janus structures are synthesized on solid surfaces. In this research, we, for the first time, propose the concept of Janus surface structures and demonstrate the application of the asymmetrical surface structures in the immobilization of enzymes.…”

Section: Methodsmentioning

confidence: 99%

Janus Surface Micelles on Silica Particles: Synthesis and Application in Enzyme Immobilization

Wang

Hou

Liu

et al. 2020

Macromol. Rapid Commun.

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In these years, synthesis and applications of Janus structures have aroused great interest for large‐scale applications in chemistry and materials science. Up to now, Janus particles with different morphologies and different functionalities have been synthesized in solutions, but the synthesis of Janus particles on solid surfaces has not been touched. In this research, Janus surface micelles (JSMs) are fabricated on the surfaces of silica particles by polymerization induced surface self‐assembly (PISSA) approach, and the JSMs are used for enzyme immobilization. Usually, enzyme immobilization should be able to optimize the performance of the immobilized enzymes, and an ideal immobilization system must offer protection to the immobilized enzyme with retained bioactivity. Herein, it is demonstrated that JSMs on silica particles can be used as an ideal platform for the immobilization of enzymes. To prepare JSMs, poly(2‐(dimethylamino) ethyl methacrylate) macro chain transfer agent (PDMAEMA‐CTA) brushes on silica particles and poly(di(ethylene glycol) methyl ether methacrylate) macro CTA (PDEGMA‐CTA) are employed in reversible addition‐fragmentation chain transfer dispersion polymerization of styrene. After polymerization, JSMs with polystyrene cores and PDMAEMA/PDEGMA patches on the surfaces are prepared on silica particles. After quaternization reaction, the quaternized PDMAEMA patches are used for the immobilization of enzymes. Experimental results turn out that enhanced bioactivities of the immobilized enzymes are achieved and the enzyme molecules are well protected by surface Janus structures.

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“…Phase separation leads to the formation of weak interfaces and cause high stress concentrations locally when under load. In order to control the phase separation, various compatibilization methods are applied, such as the addition of low-molecular-weight organic molecules [10][11][12][13], inorganic nanoparticles [14][15][16][17], Janus-type hybrid materials [18][19][20][21], and copolymers with functional moieties [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Properties of Styrene–Maleic Anhydride Copolymer Compatibilized Polyamide 66/Poly (Phenylene Ether) Blends: Effect of Maleic Anhydride Concentration and Copolymer Content

2020

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Polyamide 66 (PA66)/poly (2,6-dimethyl-1,4-phenylene ether) (PPE) blends with a ratio of 50/50 (w/w) were produced by a twin-screw compounder. The immiscible blends were compatibilized using two different styrene–maleic anhydride copolymers (SMA) with a low (SMAlow) and a high (SMAhigh) maleic anhydride (MA) concentration of 8 and 25 wt%, respectively. Furthermore, the SMA content was varied from 0 to 10 wt%. The influence of MA concentration and SMA content on the morphological and thermomechanical properties of PA66/PPE blends was investigated. Herein, we established correlations between the interfacial activity of the SMA with blend morphology and corresponding tensile properties. A droplet-sea to co-continuous morphology transition was shown by scanning electron microscopy to occur between 1.25 and 5 wt% in the case of SMAhigh. For SMAlow, the transition started from 7.5 wt% and was still ongoing at 10 wt%. It was found that SMAlow with 10 wt% content enhanced the tensile strength (10%) and elongation at break (70%) of PA66/PPE blends. This improvement can be explained by the strong interfacial interaction of SMAlow within the blend system, which features the formation of nanoemulsion morphology, as shown by transmission electron microscopy. Very small interdomain distances hinder matrix deformations, which forces debonding and cohesive failure of the PPE phase as a “weaker” main deformation mechanism. Due to a lack of interfacial activity, the mechanical properties of the blends with SMAhigh were not improved.

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Janus particles: from synthesis to application

Cited by 106 publications

References 300 publications

Straightforward preparation of supramolecular Janus nanorods by hydrogen bonding of end-functionalized polymers

Straightforward preparation of supramolecular Janus nanorods by hydrogen bonding of end-functionalized polymers

Janus Surface Micelles on Silica Particles: Synthesis and Application in Enzyme Immobilization

Properties of Styrene–Maleic Anhydride Copolymer Compatibilized Polyamide 66/Poly (Phenylene Ether) Blends: Effect of Maleic Anhydride Concentration and Copolymer Content

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