Light‐Induced Reversible Self‐Assembly of Gold Nanoparticles Surface‐Immobilized with Coumarin Ligands

He, Hong; Mao, Feng; Cai, Daoping; Zhang, Xinqi; Zhan, Hongbing

doi:10.1002/ange.201508355

Cited by 30 publications

(22 citation statements)

References 35 publications

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“…Also, similar modes have been extended to other precious metals, such as silver, for the construction of functional composites 27,28 . Combined with easy-assembly feature of precious metal nanostructures when exposed to external stimuli, unique metal nano-assemblies would provide numerous possibilities in the creation of soft materials with anisotropic structures 29,30 .…”

Section: Introductionmentioning

confidence: 99%

Anisotropic and self-healing hydrogels with multi-responsive actuating capability

et al. 2019

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Inspired by smart biological tissues, artificial muscle-like actuators offer fascinating prospects due to their distinctive shape transformation and self-healing function under external stimuli. However, further practical application is hindered by the lack of simple and general routes to fabricate ingenious soft materials with anisotropic responsiveness. Here, we describe a general in situ polymerization strategy for the fabrication of anisotropic hydrogels composed of highly-ordered lamellar network crosslinked by the metal nanostructure assemblies, accompanied with remarkably anisotropic performances on mechanical, optical, de-swelling and swelling behaviors. Owing to the dynamic thiolate-metal coordination as healing motifs, the composites exhibit rapid and efficient multi-responsive self-healing performance under NIR irradiation and low pH condition. Dependent on well-defined anisotropic structures, the hydrogel presents controllable solvent-responsive mechanical actuating performance. Impressively, the integrated device through a healing-induced assembly way can deliver more complicated, elaborate forms of actuation, demonstrating its great potentials as superior soft actuators like smart robots.

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Section: Introductionmentioning

confidence: 99%

Anisotropic and self-healing hydrogels with multi-responsive actuating capability

et al. 2019

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“…16,17 For many of such applications control over the density of the functional groups on the particle surface is essential. 18 Molecular sensors based on the aggregation of AuNPs for the detection of biomolecules will only work in the adequate dynamic range if the number of functional groups present at their surface matches the analyte concentration. 15,19 Too low densities of functional groups will lead to saturation of the AuNPs with the analyte, whereas too high levels of functionalisation could prevent binding of the analyte or give uncontrolled aggregation (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Controlled Functionalization of Gold Nanoparticles with Mixtures of Calix[4]arenes Revealed by Infrared Spectroscopy

Valkenier¹,

Malytskyi²,

Blond³

et al. 2017

Langmuir

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Labile ligands such as thiols and carboxylates are commonly used to functionalize AuNPs, though little control over the composition is possible when mixtures of ligands are used. It was shown recently that robustly functionalized AuNPs can be obtained through the reductive grafting of calix[4]arenes bearing diazonium groups on the large rim. Here, we report a calix[4]arene-tetradiazonium decorated by four oligo(ethylene glycol) chains on the small rim, which upon grafting gave AuNPs with excellent stability thanks to the C-Au bonds. Mixtures of this calixarene and one with four carboxylate groups were grafted on AuNPs. The resulting particles were analyzed by infrared spectroscopy, which revealed that the composition of the ligand shell clearly reflected the ratio of calixarenes that was present in solution. This strategy opens the way to robustly protected AuNPs with well-defined numbers of functional or postfunctionalizable groups.

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“…This type of group can transit reversibly between two structures upon irradiation. Among the photochromic groups that have been used to modify the surface of MNPs, azobenzene (AB) [ 57 , 58 ], spiropyran (SP) [ 59 ], and coumarin (Coum) [ 60 ] present a reversible transformation between their isomers (photoisomerization), which results in polarity and hydrophobicity changes that can lead to the organization or disassembly of NPs [ 61 , 62 ]. He et al [ 60 ] reported Coum-functionalized AuNPs capable of performing reversible self-assembly based on the photolysis of coumarin in response to light irradiation.…”

Section: Overview: Green Biosynthesis Of Metallic Nanoparticlesmentioning

confidence: 99%

“…Among the photochromic groups that have been used to modify the surface of MNPs, azobenzene (AB) [ 57 , 58 ], spiropyran (SP) [ 59 ], and coumarin (Coum) [ 60 ] present a reversible transformation between their isomers (photoisomerization), which results in polarity and hydrophobicity changes that can lead to the organization or disassembly of NPs [ 61 , 62 ]. He et al [ 60 ] reported Coum-functionalized AuNPs capable of performing reversible self-assembly based on the photolysis of coumarin in response to light irradiation. The authors demonstrated that this nanosystem could be self-assembled from the red disperse state to the purple aggregate state by irradiation with λ = 365 nm and then transformed back to the original disassembly state using UV irradiation.…”

Section: Overview: Green Biosynthesis Of Metallic Nanoparticlesmentioning

confidence: 99%

Green Metallic Nanoparticles for Cancer Therapy: Evaluation Models and Cancer Applications

et al. 2021

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Metal-based nanoparticles are widely used to deliver bioactive molecules and drugs to improve cancer therapy. Several research works have highlighted the synthesis of gold and silver nanoparticles by green chemistry, using biological entities to minimize the use of solvents and control their physicochemical and biological properties. Recent advances in evaluating the anticancer effect of green biogenic Au and Ag nanoparticles are mainly focused on the use of conventional 2D cell culture and in vivo murine models that allow determination of the half-maximal inhibitory concentration, a critical parameter to move forward clinical trials. However, the interaction between nanoparticles and the tumor microenvironment is not yet fully understood. Therefore, it is necessary to develop more human-like evaluation models or to improve the existing ones for a better understanding of the molecular bases of cancer. This review provides recent advances in biosynthesized Au and Ag nanoparticles for seven of the most common and relevant cancers and their biological assessment. In addition, it provides a general idea of the in silico, in vitro, ex vivo, and in vivo models used for the anticancer evaluation of green biogenic metal-based nanoparticles.

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Light‐Induced Reversible Self‐Assembly of Gold Nanoparticles Surface‐Immobilized with Coumarin Ligands

Cited by 30 publications

References 35 publications

Anisotropic and self-healing hydrogels with multi-responsive actuating capability

Anisotropic and self-healing hydrogels with multi-responsive actuating capability

Controlled Functionalization of Gold Nanoparticles with Mixtures of Calix[4]arenes Revealed by Infrared Spectroscopy

Green Metallic Nanoparticles for Cancer Therapy: Evaluation Models and Cancer Applications

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