Thermo-responsive plasmonic systems: old materials with new applications

Ding, Tao; Baumberg, Jeremy J.

doi:10.1039/c9na00800d

Cited by 24 publications

(11 citation statements)

References 94 publications

(127 reference statements)

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“…They have been applied in surface coating, drug accumulation and release, drug delivery, − optoelectronic switches, and many other applications. Among them, stimuli-responsive (smart) nanogels (gels with dimensions in the nanometer range) undergo a sharp and reversible volume phase transition (a conformational change that leads to a drastic variation in the degree of swelling) in a response to environmental stimuli, such as the change in temperature, pH, ionic strength, or solvent nature . These properties made them particularly interesting for various nanotechnological and nanomedicinal applications as nanocarriers for different types of molecules (drugs, reactants, proteins), such as drug delivery, in chemical separation and catalytic processes. − …”

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confidence: 99%

Scaling Laws in the Diffusive Release of Neutral Cargo from Hollow Hydrogel Nanoparticles: Paclitaxel-Loaded Poly(4-vinylpyridine)

et al. 2020

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We study the nonequilibrium diffusive release of electroneutral molecular cargo encapsulated inside hollow hydrogel nanoparticles. We propose a theoretical model that includes osmotic, steric, and short-range polymer−cargo attractions to determine the effective cargo−hydrogel interaction, u eff *, and the effective diffusion coefficient of the cargo inside the polymer network, D eff *. Using dynamical density functional theory (DDFT), we investigate the scaling of the characteristic release time, τ 1/2 , with the key parameters involved in the process, namely, u eff *, D eff *, and the swelling ratio. This effort represents a full study of the problem, covering a broad range of cargo sizes and providing predictions for repulsive and attractive polymer shells. Our calculations show that the release time through repulsive polymer networks scales with q 2 e βu eff * /D eff * for βu eff * ≫ 1. In this case, the cargo molecules are excluded from the shell of the hydrogel. For attractive shells, the polymer retains the cargo molecules on its internal surface and its interior, and the release time grows exponentially with the attraction strength. The DDFT calculations are compared to an analytical model for the mean first passage time, which provides an excellent quantitative description of the kinetics for both repulsive and attractive shells without fitting parameters. Finally, we apply the method to reproduce experimental results on the release of paclitaxel from hollow poly(4-vinylpyridine) nanoparticles and find that the slow release of the drug can be explained in terms of the strong binding attraction between the drug and the polymer.

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confidence: 99%

Scaling Laws in the Diffusive Release of Neutral Cargo from Hollow Hydrogel Nanoparticles: Paclitaxel-Loaded Poly(4-vinylpyridine)

et al. 2020

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“…[1][2][3][4][5][6][7][8] Recently, the active arrangement (reversible tuning) of plasmonic structures has attracted a good deal of attention as a challenging new eld. [9][10][11][12][13] This arrangement is classied broadly into two approaches; gold nanoparticles (GNPs) are controlled as (i) dispersions in a solution or (ii) on/in substrates. A typical example of the former approach is stimuli-responsive assembly/disassembly using temperature-, [14][15][16][17] pH-, [18][19][20] and photo-responsive 21,22 GNPs.…”

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confidence: 99%

Reversible changes in the orientation of gold nanorod arrays on polymer brushes

et al. 2020

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“…There exist several well-defined systems to prepare responsive plasmonic assemblies with tunable optical properties. They can be developed by either direct assembling plasmonic nanoparticles in colloidal dispersions or by perturbating the assembled structures in soft matrix under physical and chemical stimuli ( Ding et al, 2016 ; Liu et al, 2018 ; Ding and Baumberg, 2020 ). For example, plasmonic nanochains can be directed assembled in colloidal dispersions by regulating the interactions between nanoparticles.…”

Section: Responsive Plasmonic Nanostructuresmentioning

confidence: 99%

Responsive Plasmonic Nanomaterials for Advanced Cancer Diagnostics

Lu¹,

Ni²,

Yin³

et al. 2021

Front. Chem.

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Plasmonic nanostructures, particularly of noble-metal Au and Ag, have attracted long-lasting research interests because of their intriguing physical and chemical properties. Under light excitation, their conduction electrons can form collective oscillation with the electromagnetic fields at particular wavelength, leading to localized surface plasmon resonance (LSPR). The remarkable characteristic of LSPR is the absorption and scattering of light at the resonant wavelength and greatly enhanced electric fields in localized areas. In response to the chemical and physical changes, these optical properties of plasmonic nanostructures will exhibit drastic color changes and highly sensitive peak shifts, which has been extensively used for biological imaging and disease treatments. In this mini review, we aim to briefly summarize recent progress of preparing responsive plasmonic nanostructures for biodiagnostics, with specific focus on cancer imaging and treatment. We start with typical synthetic approaches to various plasmonic nanostructures and elucidate practical strategies and working mechanism in tuning their LSPR properties. Current achievements in using responsive plasmonic nanostructures for advanced cancer diagnostics will be further discussed. Concise perspectives on existing challenges in developing plasmonic platforms for clinic diagnostics is also provided at the end of this review.

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Thermo-responsive plasmonic systems: old materials with new applications

Abstract: Thermo-sensitive plasmonic system made of Au and poly(N-isopropylacrylamide) are exploited for various applications from optical tuning and chemical sensing to microfluidics and nanoactuation.

Cited by 24 publications

References 94 publications

Scaling Laws in the Diffusive Release of Neutral Cargo from Hollow Hydrogel Nanoparticles: Paclitaxel-Loaded Poly(4-vinylpyridine)

Scaling Laws in the Diffusive Release of Neutral Cargo from Hollow Hydrogel Nanoparticles: Paclitaxel-Loaded Poly(4-vinylpyridine)

Reversible changes in the orientation of gold nanorod arrays on polymer brushes

Responsive Plasmonic Nanomaterials for Advanced Cancer Diagnostics

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