Tuning aggregation-induced emission nanoparticle properties under thin film formation

Tavakoli, Javad; Pye, Scott; Reza, Aghabozorg Hamid; Xie, Ni; Qin, Jianguang; Raston, Colin L.; Tang, Ben Zhong; Tang, Youhong

doi:10.1039/c9qm00585d

Cited by 24 publications

(26 citation statements)

References 26 publications

(27 reference statements)

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“…[1][2][3][4][5][6][7] In particular, many AIE-based NP probes that outperform conventional fluorescent probes have been developed for sensing, imaging, and theranostic applications. 4,5 Various approaches have been employed to produce AIE-active luminescent NPs, such as noncovalent fabrication, 8 precipitation, 9 miniemulsion polymerization, 10,11 Schiff base condensation, 12 free radical polymerization, 13 anhydride ring-opening polymerization, 14 one-pot Mannich reaction, 15 and self-catalyzed photo-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. 16 Nevertheless, similar to conventional luminescent materials, the emission properties of most AIE-active materials are affected by the molecular dispersion (i.e., strong emission at aggregated states and no emission or weak fluorescence in diluted or nonaggregated states for AIE molecules and vice-versa for conventional aggregation-caused quenching [ACQ] molecules).…”

Section: Introductionmentioning

confidence: 99%

Aggregation‐induced multicolor luminescent nanoparticles with adaptive and fixed cores derived from brominated tetraphenylethene‐containing block copolymer

Furukawa

Nakabayashi

Mori

2021

Journal of Polymer Science

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Aggregation‐induced emission (AIE)‐active nanoparticles (NPs) exhibiting multicolor fluorescence and high‐quantum yields independent of the environment are important for the further development of next‐generation smart fluorescent materials. In this work, AIE‐active amphiphilic block copolymers were designed and synthesized by RAFT polymerization of a brominated tetraphenylethene (TPE)‐containing acrylate (A‐TPE‐Br). The block copolymer exhibited typical AIE effects in selective solvents, which can be explained by hydrophobic TPE aggregated in the core during micelle formation. Luminescent core–shell NPs with a crosslinked AIE core (fixed structure) were synthesized by the Suzuki coupling reaction of the bromine groups of the assembled block copolymer and boronic acid compounds. The NPs composed of TPE/thiophene crosslinked core showed green emission in both diluted state and solid state, implying the ability to fluoresce regardless of environmental changes and molecular dispersion. Multicolor luminescent NPs capable of changing color from blue to red were synthesized by changing the coupling compounds, such as anthracene for electron‐rich units and benzothiadiazole for electron‐deficient units. The effects of the nature of the donor and acceptor, as well as their combination (TPE/donor/acceptor sequence), on the color and fluorescent intensity of the core crosslinked NPs in the nonpolar and polar solvents, and solid state, were investigated.

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Section: Introductionmentioning

confidence: 99%

Aggregation‐induced multicolor luminescent nanoparticles with adaptive and fixed cores derived from brominated tetraphenylethene‐containing block copolymer

Furukawa

Nakabayashi

Mori

2021

Journal of Polymer Science

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“…The forces applied to the PVA solution after injection due to the rotation of the borax solution are likely to be the main cause of these phenomena. The PVA injected into the VFD tube experienced different magnitudes of the centrifugal force, depending on different rotation speeds [45], which was responsible for the formation of different surface morphologies (Fig. 2m).…”

Section: Resultsmentioning

confidence: 99%

“…We have successfully employed VFD for a number of diverse applications, including the fabrication of various nanocarbon materials [39,40], intensified aqueous two-phase separation for protein purification [41], manipulation of polymer networks [42], exfoliation of graphite and boron nitride [43] and protein folding [44]. Of particular interest, we have found the VFD to be effective for controlling the size and shape of nanoparticles in both topdown and bottom-up processing [45]. In contrast to other methods incorporating rotation to evaporate a solvent and form a film, such as spin coating method, the VFD method imparts micro-mixing and shear stress and provides a variety of controlling parameters, including type of solvents, rotation, and direction of speed, temperature, rate of injection, tilt angle, and modes of operation, i.e., confined and continuous flow to simultaneously fabricate a hydrogel film and tune the surface morphology.…”

Section: Introductionmentioning

confidence: 99%

Vortex fluidic mediated one-step fabrication of polyvinyl alcohol hydrogel films with tunable surface morphologies and enhanced self-healing properties

Tavakoli

Raston

et al. 2020

Sci. China Mater.

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Previous strategies for controlling the surface morphologies of polyvinyl alcohol (PVA)-based hydrogels, including freeze-drying and electrospinning, require a posttreatment process, which can affect the final textures and properties of the hydrogels. Of particular interest, it is almost impossible to control the surface morphology during the formation of PVA hydrogels using these approaches. The strategy reported in this study used the novel vortex fluidic device (VFD) technology, which for the first time provided an opportunity for one-step fabrication of PVA hydrogel films. PVA hydrogels with different surface morphologies could be readily fabricated using a VFD. By also reducing the crosslinking agent concentration, a self-healing gel with enhanced fracture stress (60% greater than that of traditionally made hydrogel) was achieved. Interestingly, the associated selfhealing property remained unchanged during the 260-s mechanical testing performed with the strain rate of 5% s −1. The VFD can effectively tune the surface morphologies of the PVA-based hydrogels and their associated properties, particularly the self-healing property.

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“…We recently developed a technique to tune the size of AIEgens using a VFD, leading to the creation of highly fluorescent nanoAIEgens with sizes ranging from 10 to 80 nm [90]. Motivated by this study, we successfully proposed a new methodology to readily prepare AIEgen-hyperbranched assemblies based on diffusion of AIEgens into the hyperbranched structure.…”

Section: Fluorescent Hydrogelsmentioning

confidence: 99%

Tuning Surface Morphology of Fluorescent Hydrogels Using a Vortex Fluidic Device

2020

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In recent decades, microfluidic techniques have been extensively used to advance hydrogel design and control the architectural features on the micro- and nanoscale. The major challenges with the microfluidic approach are clogging and limited architectural features: notably, the creation of the sphere, core-shell, and fibers. Implementation of batch production is almost impossible with the relatively lengthy time of production, which is another disadvantage. This minireview aims to introduce a new microfluidic platform, a vortex fluidic device (VFD), for one-step fabrication of hydrogels with different architectural features and properties. The application of a VFD in the fabrication of physically crosslinked hydrogels with different surface morphologies, the creation of fluorescent hydrogels with excellent photostability and fluorescence properties, and tuning of the structure–property relationship in hydrogels are discussed. We conceive, on the basis of this minireview, that future studies will provide new opportunities to develop hydrogel nanocomposites with superior properties for different biomedical and engineering applications.

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Tuning aggregation-induced emission nanoparticle properties under thin film formation

Abstract: The preparation of AIE nanoparticles under thin film formation controls their size and the associated fluorescent intensity, with the smaller nanoparticles significantly increasing brightness.

Cited by 24 publications

References 26 publications

Aggregation‐induced multicolor luminescent nanoparticles with adaptive and fixed cores derived from brominated tetraphenylethene‐containing block copolymer

Aggregation‐induced multicolor luminescent nanoparticles with adaptive and fixed cores derived from brominated tetraphenylethene‐containing block copolymer

Vortex fluidic mediated one-step fabrication of polyvinyl alcohol hydrogel films with tunable surface morphologies and enhanced self-healing properties

Tuning Surface Morphology of Fluorescent Hydrogels Using a Vortex Fluidic Device

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