An infrared-light responsive graphene-oxide incorporated poly(N-isopropylacrylamide) hydrogel nanocomposite

Lo, Chi-Wei; Zhu, Difeng; Jiang, Hongrui

doi:10.1039/c1sm00011j

Cited by 210 publications

(177 citation statements)

References 27 publications

(30 reference statements)

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“…The same findings were reported with GO/poly acrylic acid hydrogel -it formed gel more rapidly under a basic condition than when neutral (Liu et al, 2014). Photothermal sensitivity is another important factor in formation of GO/polymer composite hydrogel (Lo et al, 2011;Wang et al, 2013a,b,c). The hydrogels showed a high degree of shrinkage under near-infrared laser irradiation, but after cooling, swelled back to the original form.…”

Section: Influencing Factors For the Preparation Of Gas From Gelationsupporting

confidence: 72%

Recent Progress in Multifunctional Graphene Aerogels

Kotal

Kim

et al. 2016

Front. Mater.

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Two dimensional (2D) graphene has become one of the most intensively explored carbon allotropes in materials science owing to attractive features like its outstanding physicochemical properties. In order to further practical applications, the fabrication of self-assembled 2D individual graphene sheets into 3D graphene aerogels (GAs) with special structures and novel functions is now becoming essential. Moreover, GAs are ideal as supports for the introduction of nanoparticles, polymers, and functional materials to further enhance their applications in broad areas. GAs have light weight, large surface area, good compressibility, extensibility, and high electrical conductivity. They have been used as efficient electrodes for batteries, in supercapacitors, and in sensors and actuators. This critical review mainly addresses recent progress in the methods used for their synthesis, their properties, and applications for energy storage, and in sensors and actuators. Furthermore, to assist advanced research for practical applications of these emerging materials, the technical challenges are discussed, and future research directions are proposed.

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Section: Influencing Factors For the Preparation Of Gas From Gelationsupporting

confidence: 72%

Recent Progress in Multifunctional Graphene Aerogels

Kotal

Kim

et al. 2016

Front. Mater.

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“…The preparation process and the type of carbon filler used determine the interactions between the filler particles as well as between the fillers and the polymer matrix [28]. Investigations regarding CNT [29][30][31] and GO [32][33][34] containing PNIPA based composite systems show improved mechanical properties (elastic modulus and compressive strength). As these gels were investigated with a variety of cross-link densities and/or with different co-monomers, as well as diverse conditions of synthesis, it is not possible to evaluate the effects of the different nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Manek

Berke

Miklósi

et al. 2016

Express Polym. Lett.

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Abstract.Comparative investigations are reported on poly(N-isopropylacrylamide) (PNIPA) gels of various carbon nanotube (CNT) and graphene oxide (GO) contents synthesized under identical conditions. The kind and concentration of the incorporated carbon nanoparticles (CNPs) influence the swelling and stress-strain behaviour of the composites. Practically independently of the filler content, incorporation of CNPs appreciably improves the fracture stress properties of the gels. The time constant and the swelling ratio of the shrinkage following an abrupt increase in temperature of the swelling medium from 20 to 50°C can be adjusted by selecting both the type and the amount of nanoparticle loading. This offers a means of accurately controlling the deswelling kinetics of drug release with PNIPA systems, and could be employed in sensor applications where fast and excessive shrinkage are a significant drawback. Both CNTs and GO enhance the infrared sensitivity of the PNIPA gel, thus opening a route for the design of novel drug transport and actuator systems. It is proposed that the influence of the CNPs depends more on their surface reactivity during the gel synthesis rather than on their morphology. One of the important findings of this study is the existence of a thermally conducting network in the GO filled gels.

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“…Experimental findings have proven the viability of photothermal sensitive hydrogels as a good material for remote controlling of devices in applications such as drug delivery (Sershen et al, http://dx.doi.org/10.1016/j.ijsolstr.2014.09.014 0020-7683/Ó 2014 Elsevier Ltd. All rights reserved. 2000), microfluidics (Lo et al, 2011) and optical switching (Yoon et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Mechanics of inhomogeneous large deformation of photo-thermal sensitive hydrogels

Toh

et al. 2014

International Journal of Solids and Structures

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a b s t r a c tA polymer network can imbibe copious amounts of solvent and swell, the resulting state is known as a gel. Depending on its constituents, a gel is able to deform under the influence of various external stimuli, such as temperature, pH-value and light. In this work, we investigate the photo-thermal mechanics of deformation of temperature sensitive hydrogels impregnated with light-absorbing nano-particles. The field theory of photo-thermal sensitive gels is developed by incorporating effects of photochemical heating into the thermodynamic theory of neutral and temperature sensitive hydrogels. This is achieved by considering the equilibrium thermodynamics of a swelling gel through a variational approach. The phase transition phenomenon of these gels, and the factors affecting their deformations, are studied. To facilitate the simulation of large inhomogeneous deformations subjected to geometrical constraints, a finite element model is developed using a user-defined subroutine in ABAQUS, and by modeling the gel as a hyperelastic material. This numerical approach is validated through case studies involving gels undergoing phase coexistence and buckling when exposed to irradiation of varying intensities, and as a microvalve in microfluidic application.

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An infrared-light responsive graphene-oxide incorporated poly(N-isopropylacrylamide) hydrogel nanocomposite

Cited by 210 publications

References 27 publications

Recent Progress in Multifunctional Graphene Aerogels

Recent Progress in Multifunctional Graphene Aerogels

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

Mechanics of inhomogeneous large deformation of photo-thermal sensitive hydrogels

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