Performance of Fast-Responsive, Porous Crosslinked Poly(N-Isopropylacrylamide) in a Piezoresistive Microsensor

Franke, Daniela; Binder, Simon; Gerlach, Gerald

doi:10.1109/lsens.2017.2773626

Cited by 16 publications

(22 citation statements)

References 6 publications

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“…The equilibrium swelling degree (constant value) is reached after 20 min while the nonporous hydrogel does not reach the equilibrium swelling value. This agrees with the findings in [27] where we found a significant decrease of the response time of a piezoresistive microsensor when using a porous PNIPAAm hydrogel as the transducer. The deswelling times found for PNIPAAm in [27] are much lower 10 µm 10 µm…”

Section: Temperature-dependent Swelling Behaviorsupporting

confidence: 92%

“…The average pore diameter is 2.6 µm with a standard deviation of 1.1 µm. It is therefore similar to the value found for porous PNIPAAm in [27] showing the transferability of the synthesis method to other more complex hydrogel systems.…”

Section: Scanning Electron Microscopy (Sem)supporting

confidence: 85%

“…In our approach, we form an interconnected porous network inside the semi-IPN hydrogel by chemical synthesis using a surfactant-based template method. We already introduced this method in [27] where we (in part) also showed a major decrease of the response time of a temperature sensor based on PNIPAAm. The synthesis method is described e.g., in [28].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we extend the synthesis method in [27] to the semi-IPN from [1] in order to receive a porous semi-IPN with enhanced swelling characteristics with respect to temperature and salt concentration.…”

Section: Introductionmentioning

confidence: 99%

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Swelling Studies of Porous and Nonporous Semi-IPN Hydrogels for Sensor and Actuator Applications

Franke

Gerlach

2020

Micromachines

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In this article, we present a semi-interpenetrating network (IPN) hydrogel of reasonable size with improved swelling behavior. The semi-IPN is composed of N-isopropylacrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid. Porosity was generated chemically by a surfactant-based template method. The swelling behavior was measured after an abrupt change of the temperature to 25 °C or 40 °C or after an abrupt change of the salt concentration of the aqueous medium surrounding the hydrogel samples. A set of static swelling degrees was determined from swelling measurements in salt solutions of varying concentrations and at different temperatures. Introducing porosity to the semi-IPN decreases the swelling times for most measurements while the sensor and actuator characteristics of the hydrogel found in previous studies are preserved. Additionally, we propose theoretical assumptions and explanations regarding the differences in the swelling kinetics of the porous and the nonporous semi-IPN and deduce implications for sensor and actuator applications.

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Section: Temperature-dependent Swelling Behaviorsupporting

confidence: 92%

Section: Scanning Electron Microscopy (Sem)supporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Swelling Studies of Porous and Nonporous Semi-IPN Hydrogels for Sensor and Actuator Applications

Franke

Gerlach

2020

Micromachines

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“…These gels can be combined with piezoresistive pressure sensors, which can transform the swelling pressure into a measurable output voltage [11]. For example, hydrogel-based piezoresistive sensors have been used so far for the detection of the pH value [12], temperature [13], biomolecules like glucose [14] or organic solvents like ethanol [15].…”

Section: Introductionmentioning

confidence: 99%

Detection of Ammonia Based on Stimuli-Responsive Hydrogels

2018

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This article describes an ammonia-responsive hydrogel based on acrylic acid (AAc) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). The influence of the hydrogel composition on swelling behavior in the alkaline range was shown. Furthermore, the hydrogel swelling in ammonia solutions was tested and a detection limit in the range of 1 mmol/L ammonia in dependence of the buffer solution was determined.

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Recent Advances in Poly(N‐isopropylacrylamide) Hydrogels and Derivatives as Promising Materials for Biomedical and Engineering Emerging Applications

et al. 2023

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Temperature‐sensitive (thermosensitive) hydrogels, which are part of the family of stimulus‐sensitive hydrogels, consist of water‐filled polymer networks that display a temperature‐dependent degree of swelling. Thermosensitive hydrogels, which can undergo phase transition or swell/de‐swell as temperature changes, have great potential in various technological and biomedical purposes for a number of reasons: their temperature response is reversible, hydrogels are stable and easy to prepare, they can be biocompatible and also be suitably combined with other organic and inorganic materials, resulting in new materials with outstanding properties. Among thermosensitive hydrogels poly(N‐isopropylacrylamide) (PNIPAAm) is the most extensively studied because it brings together the best properties of these materials. Consequently, in the past few years, a wide number of applications and new chemical processes to prepare PNIPAAm and their derivatives are being proposed. The objective of this review is to summarize the fundamentals of thermosensitive hydrogels and recent advances in preparation and both technological and biomedical applications of thermosensitive hydrogel, with a special focus on PNIPAAm and their derivatives. Special attention has been given to the discussion of challenges and future research perspectives based on new horizons not yet considered.

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Performance of Fast-Responsive, Porous Crosslinked Poly(N-Isopropylacrylamide) in a Piezoresistive Microsensor

Cited by 16 publications

References 6 publications

Swelling Studies of Porous and Nonporous Semi-IPN Hydrogels for Sensor and Actuator Applications

Swelling Studies of Porous and Nonporous Semi-IPN Hydrogels for Sensor and Actuator Applications

Detection of Ammonia Based on Stimuli-Responsive Hydrogels

Recent Advances in Poly(N‐isopropylacrylamide) Hydrogels and Derivatives as Promising Materials for Biomedical and Engineering Emerging Applications

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