Elongational rheology of NIPAM-based hydrogels

Stadler, Florian J.; Friedrich, Tatjana; Kraus, Katharina; Tieke, Bernd; Bailly, Christian

doi:10.1007/s00397-013-0690-x

Cited by 20 publications

(13 citation statements)

References 42 publications

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“…The resulting trend is almost identical to that of the compression modulus. This is not surprising, as covalent hydrogels in general follow rubber-like behavior almost ideally 65 and, hence, their behavior can be described by hyper elastic models, essentially only requiring the elastic modulus to describe the behavior until break.…”

Section: Rheological Propertiesmentioning

confidence: 99%

Random copolymer gels of N-isopropylacrylamide and N-ethylacrylamide: effect of synthesis solvent compositions on their properties

Wang

Biswas

et al. 2017

RSC Adv.

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Section: Rheological Propertiesmentioning

confidence: 99%

Random copolymer gels of N-isopropylacrylamide and N-ethylacrylamide: effect of synthesis solvent compositions on their properties

Wang

Biswas

et al. 2017

RSC Adv.

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“…[11][12][13][14][15] Considerable efforts have been devoted to fabricate the hydrogels with enhanced mechanical and electrical properties. [ 11,12 ] Due to the 3D network structure of hydrogels, they have excellent capability of embedding the material of choice, which improves its physical properties exceptionally. Carbon nanotubes (CNTs) were recently used for this purpose due to their unique mechanical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, hydrogels have been used in various electrical, biological, medical, mechanical, and chemical engineering applications due to their outstanding biological and physical features such as biocompatibility, transparency, impact resistance, water absorbance, and separation capability . Considerable efforts have been devoted to fabricate the hydrogels with enhanced mechanical and electrical properties . Due to the 3D network structure of hydrogels, they have excellent capability of embedding the material of choice, which improves its physical properties exceptionally.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide/Carbon Nanotube Composite Hydrogels—Versatile Materials for Microbial Fuel Cell Applications

kumar

Hashmi

Karthikeyan

et al. 2014

Macromol. Rapid Commun.

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103

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Carbonaceous nanocomposite hydrogels are prepared with an aid of a suspension polymerization method and are used as anodes in microbial fuel cells (MFCs). (Poly N-Isopropylacrylamide) (PNIPAM) hydrogels filled with electrically conductive carbonaceous nanomaterials exhibit significantly higher MFC efficiencies than the unfilled hydrogel. The observed morphological images clearly show the homogeneous dispersion of carbon nanotubes (CNTs) and graphene oxide (GO) in the PNIPAM matrix. The complex formation of CNTs and GO with NIPAM is evidenced from the structural characterizations. The effectual MFC performances are influenced by combining the materials of interest (GO and CNTs) and are attributed to the high surface area, number of active sites, and improved electron-transfer processes. The obtained higher MFC efficiencies associated with an excellent durability of the prepared hydrogels open up new possibilities for MFC anode applications.

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“…Previous experimental works from our group comparing AFM indentation with rheology confirmed this Poisson’s ratio assumption 17 , 25 – 27 , where Cox–Merz rule 28 (linking dynamic-mechanical and start-up shear experiments) was used to convert shear into elongational modulus by 3| G *| = E . Finally, previous direct rheological data demonstrate incompressibility behavior 29 . Inverting Eq.…”

Section: Resultsmentioning

confidence: 51%

Atomic force microscopy methodology and AFMech Suite software for nanomechanics on heterogeneous soft materials

et al. 2018

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Atomic force microscopy has proven to be a valuable technique to characterize the mechanical and morphological properties of heterogeneous soft materials such as biological specimens in liquid environment. Here we propose a 3-step method in order to investigate biological specimens where heterogeneity hinder a quantitative characterization: (1) precise AFM calibration, (2) nano-indentation in force volume mode, (3) array of finite element simulations built from AFM indentation events. We combine simulations to determine internal geometries, multi-layer material properties, and interfacial friction. In order to easily perform this analysis from raw AFM data to simulation comparison, we propose a standalone software, AFMech Suite comprising five interacting interfaces for simultaneous calibration, morphology, adhesion, mechanical, and simulation analysis. We test the methodology on soft hydrogels with hard spherical inclusions, as a soft-matter model system. Finally, we apply the method on E. coli bacteria supported on soft/hard hydrogels to prove usefulness in biological field.

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Elongational rheology of NIPAM-based hydrogels

Cited by 20 publications

References 42 publications

Random copolymer gels of N-isopropylacrylamide and N-ethylacrylamide: effect of synthesis solvent compositions on their properties

Random copolymer gels of N-isopropylacrylamide and N-ethylacrylamide: effect of synthesis solvent compositions on their properties

Graphene Oxide/Carbon Nanotube Composite Hydrogels—Versatile Materials for Microbial Fuel Cell Applications

Atomic force microscopy methodology and AFMech Suite software for nanomechanics on heterogeneous soft materials

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