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Tough nanocomposite ionogel-based actuator exhibits robust performance.

Liu X, He B, Wang Z, Tang H, Su T, Wang Q - Sci Rep (2014)

Bottom Line: Herein, we describe a cross-linked supramolecular approach to prepare tough nanocomposite gel electrolytes from HEMA, BMIMBF4, and TiO2 via self-initiated UV polymerization.The tough and stable ionogels are emerging to fabricate electric double-layer capacitor-like soft actuators, which can be driven by electrically induced ion migration.Furthermore, the actuator can not only work in harsh temperature environments (100°C and -10°C) but also realize the goal of grabbing an object by adjusting the applied voltage.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry and Advanced Research Institute, Tongji University, Shanghai 200092 (P. R. China).

ABSTRACT
Ionogel electrolytes can be fabricated for electrochemical actuators with many desirable advantages, including direct low-voltage control in air, high electrochemical and thermal stability, and complete silence during actuation. However, the demands for active actuators with above features and load-driving ability remain a challenge; much work is necessary to enhance the mechanical strength of electrolyte materials. Herein, we describe a cross-linked supramolecular approach to prepare tough nanocomposite gel electrolytes from HEMA, BMIMBF4, and TiO2 via self-initiated UV polymerization. The tough and stable ionogels are emerging to fabricate electric double-layer capacitor-like soft actuators, which can be driven by electrically induced ion migration. The ionogel-based actuator shows a displacement response of 5.6 mm to the driving voltage of 3.5 V. After adding the additional mass weight of the same as the actuator, it still shows a large displacement response of 3.9 mm. Furthermore, the actuator can not only work in harsh temperature environments (100°C and -10°C) but also realize the goal of grabbing an object by adjusting the applied voltage.

No MeSH data available.


Related in: MedlinePlus

The gelation mechanism, mechanical strength, and porous structure of ionogels.(a) Dynamic time sweep of a gelation system containing 89 wt% BMIMBF4, 1 wt% TiO2-NPs, and 10 wt% HEMA at a strain of 1% and a frequency of 1 rad s−1. (b) Compressive properties of the BMIMBF4-based ionogels with different TiO2 concentrations. (c) EPR spectra of BMIMBF4 consisting of TiO2 and HEMA under UV irradiation for 15 minutes. (d) SEM images of a freeze-dried BMIMBF4-based gel after replacing the ionic liquid with water.
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f2: The gelation mechanism, mechanical strength, and porous structure of ionogels.(a) Dynamic time sweep of a gelation system containing 89 wt% BMIMBF4, 1 wt% TiO2-NPs, and 10 wt% HEMA at a strain of 1% and a frequency of 1 rad s−1. (b) Compressive properties of the BMIMBF4-based ionogels with different TiO2 concentrations. (c) EPR spectra of BMIMBF4 consisting of TiO2 and HEMA under UV irradiation for 15 minutes. (d) SEM images of a freeze-dried BMIMBF4-based gel after replacing the ionic liquid with water.

Mentions: To understand the gelation kinetics of such a system, we conducted time sweep measurements to monitor the storage modulus (G′) and loss modulus (G″) as a function of time (Figure 2a). A crossover point between G′ and G″ curves appears at 15 minutes, indicating the rapid gelation process of this system. At the equilibrium point after 55 minutes, the value of G′ is 3.5 times larger than that of G″, indicating the formation of an elastic gel. Additionally, the final conversion of the monomer is over 96% after 60 minutes of UV irradiation (Figure S1), which is supported by the measurement of thermo-gravimetric trace (TGA). The mass loss of volatiles resulting from the residue monomers can be detected by TGA due to the thermal stability of ionic liquid and the formed polymer51.


Tough nanocomposite ionogel-based actuator exhibits robust performance.

Liu X, He B, Wang Z, Tang H, Su T, Wang Q - Sci Rep (2014)

The gelation mechanism, mechanical strength, and porous structure of ionogels.(a) Dynamic time sweep of a gelation system containing 89 wt% BMIMBF4, 1 wt% TiO2-NPs, and 10 wt% HEMA at a strain of 1% and a frequency of 1 rad s−1. (b) Compressive properties of the BMIMBF4-based ionogels with different TiO2 concentrations. (c) EPR spectra of BMIMBF4 consisting of TiO2 and HEMA under UV irradiation for 15 minutes. (d) SEM images of a freeze-dried BMIMBF4-based gel after replacing the ionic liquid with water.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4202203&req=5

f2: The gelation mechanism, mechanical strength, and porous structure of ionogels.(a) Dynamic time sweep of a gelation system containing 89 wt% BMIMBF4, 1 wt% TiO2-NPs, and 10 wt% HEMA at a strain of 1% and a frequency of 1 rad s−1. (b) Compressive properties of the BMIMBF4-based ionogels with different TiO2 concentrations. (c) EPR spectra of BMIMBF4 consisting of TiO2 and HEMA under UV irradiation for 15 minutes. (d) SEM images of a freeze-dried BMIMBF4-based gel after replacing the ionic liquid with water.
Mentions: To understand the gelation kinetics of such a system, we conducted time sweep measurements to monitor the storage modulus (G′) and loss modulus (G″) as a function of time (Figure 2a). A crossover point between G′ and G″ curves appears at 15 minutes, indicating the rapid gelation process of this system. At the equilibrium point after 55 minutes, the value of G′ is 3.5 times larger than that of G″, indicating the formation of an elastic gel. Additionally, the final conversion of the monomer is over 96% after 60 minutes of UV irradiation (Figure S1), which is supported by the measurement of thermo-gravimetric trace (TGA). The mass loss of volatiles resulting from the residue monomers can be detected by TGA due to the thermal stability of ionic liquid and the formed polymer51.

Bottom Line: Herein, we describe a cross-linked supramolecular approach to prepare tough nanocomposite gel electrolytes from HEMA, BMIMBF4, and TiO2 via self-initiated UV polymerization.The tough and stable ionogels are emerging to fabricate electric double-layer capacitor-like soft actuators, which can be driven by electrically induced ion migration.Furthermore, the actuator can not only work in harsh temperature environments (100°C and -10°C) but also realize the goal of grabbing an object by adjusting the applied voltage.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry and Advanced Research Institute, Tongji University, Shanghai 200092 (P. R. China).

ABSTRACT
Ionogel electrolytes can be fabricated for electrochemical actuators with many desirable advantages, including direct low-voltage control in air, high electrochemical and thermal stability, and complete silence during actuation. However, the demands for active actuators with above features and load-driving ability remain a challenge; much work is necessary to enhance the mechanical strength of electrolyte materials. Herein, we describe a cross-linked supramolecular approach to prepare tough nanocomposite gel electrolytes from HEMA, BMIMBF4, and TiO2 via self-initiated UV polymerization. The tough and stable ionogels are emerging to fabricate electric double-layer capacitor-like soft actuators, which can be driven by electrically induced ion migration. The ionogel-based actuator shows a displacement response of 5.6 mm to the driving voltage of 3.5 V. After adding the additional mass weight of the same as the actuator, it still shows a large displacement response of 3.9 mm. Furthermore, the actuator can not only work in harsh temperature environments (100°C and -10°C) but also realize the goal of grabbing an object by adjusting the applied voltage.

No MeSH data available.


Related in: MedlinePlus