Dual‐Responsive Nanoparticles and their Self‐Assembly

Das, Sanjib; Ranjan, Priyadarshi; Maiti, Pradipta Sankar; Singh, Gurvinder; Leitus, Gregory; Klajn, Rafał

doi:10.1002/adma.201201734

Cited by 128 publications

(113 citation statements)

References 31 publications

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“…An elegant approach to assemble SERS-active NPCs ondemand using light, but still relying on colloidal interactions was presented recently by Zhang et al [71] The use of a mixed polymer corona on the gold nanoparticles containing hydrophilic (PEG) and photoresponsive hydrophobic polymethacrylate containing spiropyran units (PSPMA), which allows in situ modulation of the ring opening of the spiropyran moiety using UV-light, a variation on the approach described by Klajn, [64] noted in Section 1.2. These functionalities allow reversible control over the attraction between the polymethacrylate segments, which leads to the formation or disassembly of (low NP number) NPCs.…”

Section: Progress Reportmentioning

confidence: 98%

“…This arose due to the conformational collapse of surface poly(ethylene glycol) (PEG) molecules on Au NPs enabling in situ modification of the steric interaction, a process that is mediated by the salt balance at elevated temperature. Klajn and co-workers recently reported the use of light to drive assembly; [64] 11 nm Fe 3 O 4 NPs, stabilized with azobenzene-terminated catechol, dissolved in solvents of low dielectric constant (e.g., toluene, in which small clusters were formed) underwent UV-induced azobenzene trans to cis isomerization, which induced attractive electric dipole interactions between particles, causing their rapid self-assembly into much larger aggregates. Irradiation of the suspensions with visible light reversed the aggregation, as the surface ligands switched back to the (predominantly) trans configuration.…”

Section: Progress Reportmentioning

confidence: 98%

See 1 more Smart Citation

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

2016

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The current state of the art in the use of colloidal methods to form nanoparticle assemblies, or clusters (NPCs) is reviewed. The focus is on the two-step approach, which exploits the advantages of bottom-up wet chemical NP synthesis procedures, with subsequent colloidal destabilization to trigger assembly in a controlled manner. Recent successes in the application of functional NPCs with enhanced emergent collective properties for a wide range of applications, including in biomedical detection, surface enhanced Raman scattering (SERS) enhancement, photocatalysis, and light harvesting, are highlighted. The role of the NP-NP interactions in the formation of monodisperse ordered clusters is described and the different assembly processes from a wide range of literature sources are classified according to the nature of the perturbation from the initial equilibrium state (dispersed NPs). Finally, the future for the field and the anticipated role of computational approaches in developing next-generation functional NPCs are briefly discussed.

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Section: Progress Reportmentioning

confidence: 98%

Section: Progress Reportmentioning

confidence: 98%

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

2016

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“…An additional advantage of using these two types of external stimuli is that they can be applied and removed instantaneously, and thus pave the way towards fabricating materials whose structures and properties can be modulated 'on demand'. For example, magnetic fields have been used to control the movement and assembly of magnetite [6][7][8] , cobalt 9,10 and other 11 superparamagnetic NPs, which gives rise to diverse functions and applications, including magnetically switchable catalysis 12,13 , water purification 14 and the remote control of intracellular signalling 15,16 . Despite these advances, this strategy requires magnetically responsive components.…”

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confidence: 99%

Light-controlled self-assembly of non-photoresponsive nanoparticles

et al. 2015

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The ability to guide the assembly of nanosized objects reversibly with external stimuli, in particular light, is of fundamental importance, and it contributes to the development of applications as diverse as nanofabrication and controlled drug delivery. However, all the systems described to date are based on nanoparticles (NPs) that are inherently photoresponsive, which makes their preparation cumbersome and can markedly hamper their performance. Here we describe a conceptually new methodology to assemble NPs reversibly using light that does not require the particles to be functionalized with light-responsive ligands. Our strategy is based on the use of a photoswitchable medium that responds to light in such a way that it modulates the interparticle interactions. NP assembly proceeds quantitatively and without apparent fatigue, both in solution and in gels. Exposing the gels to light in a spatially controlled manner allowed us to draw images that spontaneously disappeared after a specific period of time.

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“…[1][2][3][4][5][6] Among different forms of stimulus-induced signal modulation, fluorescence is particularly promising because fluorescence offers not only ultrahigh sensitivity but also selfidentifying characteristics such as emission maximum, emission color, and signal lifetime. [8][9][10][11][12][13][14] More importantly, the selected property in a dynamic material that responds to a specific region of light wavelengths is of significance as it provides orthogonality and multiplexing. Moreover, it requires no physical contact thus avoiding potential risk of chemical contamination.…”

Section: Introductionmentioning

confidence: 99%

Photoswitchable fluorescent nanoparticles and their emerging applications

Zhang

Wang

et al. 2015

Nanoscale

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Although fluorescence offers ultrasensitivity, real-world applications of fluorescence techniques encounter many practical problems. As a noninvasive means to investigate biomolecular mechanisms, pathways, and regulations in living cells, the intrinsic heterogeneity and inherent complexity of biological samples always generates optical interferences such as autofluorescence. Therefore, innovative fluorescence technologies are needed to enhance measurement reliability while not compromising sensitivity. In this review, we present current strategies that use photoswitchable nanoparticles to address these real-world challenges. The unique feature in these photoswitchable nanoparticles is that fundamental molecular photoswitches are playing the critical role of fluorescence modulation rather than traditional methods like modulating the light source. As a result, new innovative technologies that have recently emerged include super-resolution imaging, frequency-domain imaging, antiphase dual-color correlation, etc. Some of these methods improve imaging resolution down to the nanometer level, while others boost the detection sensitivity by orders of magnitude and confirm the nanoparticle probes unambiguously. These enhancements, which are not possible with non-photoswitching molecular probes, are the central topics of this review.

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Dual‐Responsive Nanoparticles and their Self‐Assembly

Abstract: Dual-responsive nanoparticles are designed by functionalizing magnetic cores with light-responsive ligands. These materials respond to both light and magnetic fields and can be assembled into various higher-order structures, depending on the relative contributions of these two stimuli.

Cited by 128 publications

References 31 publications

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

Light-controlled self-assembly of non-photoresponsive nanoparticles

Photoswitchable fluorescent nanoparticles and their emerging applications

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