Development of an ionogel membrane PVA/[EMIM] [SCN] with enhanced thermal stability and ionic conductivity for electrochemical application

Hussan, K.P. Safna; Thayyil, Mohamed Shahin; Jinitha, T. V.; Kolte, Jayant

doi:10.1016/j.molliq.2018.10.128

Cited by 22 publications

(9 citation statements)

References 41 publications

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“…The peak attributed to the CH bond on the imidazole ring at 3148 cm -1 for EMIMAc blue shifts to 2945 cm -1 in IG, indicating that the PVA molecules interact well with the EMIMAc ions. [49] The developed IG sheet is self-supporting and freestanding with no substrate needed, which is in accordance with the development trend of the filed. By fixing two stainless steel conductors at each end of a rectangular IG sheet with VHB tape (Very High Bond tape with excellent flexibility and stretchability, used to protect the sensing IG from possible degradation by moisture in the environment or sweat on the skin), a prototype IG sensor can be fabricated (Figure 1h).…”

Section: Design Of the Color-customizable Ig With Excellent Stretchab...supporting

confidence: 73%

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Color‐Customizable, Stretchable, Self‐Healable and Degradable Ionic Gel for Variable Human‐Motion Detection via Strain, Pressure, and Torsion

Wang

et al. 2022

Adv Materials Inter

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been widely considered, which possess unique properties including stretchable, self-healable, and interestingly, bio-degradable. [6][7][8][9][10][11][12] However, heightened water loss when left at ambient conditions for a short period of time was a debilitating drawback to the performance, [11] which hindered its ubiquitous application to our daily-lives. [13] To resolve the poor stability of hydrogels, ionic gels (IG), i.e., gels that contain ionic electrolytes (e.g., aqueous solutions of inorganic salts, [14][15][16][17][18] ionic liquids [19][20][21][22][23] and non-aqueous electrolyte salts, [20] offer liquid mobile ions) and polymers (serve as the framework), have gradually attracted research interest. Among the ionic electrolytes, ionic liquid (IL) excels for its comprehensive characteristics of superconductivity, weak-volatility, high electrochemical stability and wide potential window. [24][25][26][27][28][29] When composited with polymers, the superior ion conduction is preserved in the semi-solid state, and the obtained IG can withstand external loads. [30][31][32][33] Thus, various types of sensors have been developed for sensing tensile strain (stretch), [34,35] pressure (touch), [36,37] or torsion (twist). [34] However, most IG sensors are designed to sense only one type of mechanical stimulus; [38][39][40][41] if sensing multiple deformation stimuli is required, the fabrication of the sensor becomes significantly more sophisticated. [7,[42][43][44][45] Therefore, it is of great significance to design a simple sensor that is capable of detecting multiple stimuli, i.e., strain, pressure, and torsion.With the recent, rapid development in wearable electronics, flexible sensors have almost matured to marketability. However, current flexible sensing materials typically incorporate electronconductive carbon, silver or ionic conductive IL as conductive fillers into a polymer matrix. As a result, the color of the developed sensors is either pure black, white or transparent; this selection is monotonous and will not meet the color demands of the customers. This issue is particularly prominent when the sensors are attached to skin or clothing that is externally visible. On the other side, more people begin to consider their fitness levels, and night exercises (e.g., night running) has been escalating in favor by day-shift workers due to their busy days. However, survey has shown that the number of accidents caused by fitness workers' ignorance of their possible physical discomfort and poor lighting in the night are increasing each Recently, flexible sensors have attracted great interest for their promising application in wearable electronics. However, previous mechanical sensors are typically limited to detecting one type of stimulus and monotonous in color, which are not able to meet the sensing nor fashion requirements by customers who will wear them in daily life. Herein, a flexible and stretchable sensor based on highly conductive ionic gel is developed. Different phosphor nanoparticles are uniformly embe...

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Section: Design Of the Color-customizable Ig With Excellent Stretchab...supporting

confidence: 73%

“…The peak attributed to the CH bond on the imidazole ring at 3148 cm –1 for EMIMAc blue shifts to 2945 cm –1 in IG, indicating that the PVA molecules interact well with the EMIMAc ions. [ 49 ]…”

Section: Resultsmentioning

confidence: 99%

Color‐Customizable, Stretchable, Self‐Healable and Degradable Ionic Gel for Variable Human‐Motion Detection via Strain, Pressure, and Torsion

Wang

et al. 2022

Adv Materials Inter

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“…PVA films showed a crystalline peak at around 2θ = 19.7° with a shoulder at 22.6° and a small broad peak at 41.5°. The B-films showed a slight decrease in the crystalline peak's intensity and an increase in the width of the main crystalline peak with respect to the A-films, which suggests a lower percentage of crystallinity and smaller crystals in polymer B [44]. The crystallinity quantified through the peak area is indicated in Figure 6 for each sample and was higher for polymer A than for polymer B, both slightly increasing when CA was present.…”

Section: *(2-columns)mentioning

confidence: 94%

Effect of carvacrol in the properties of films based on poly (vinyl alcohol) with different molecular characteristics

Andrade

González‐Martínez

Chiralt

2020

Polymer Degradation and Stability

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“…They are equivalent to one another through the following relation given by where ε 0 is the permittivity of vacuum. The complex electric modulus, M *(ϑ) = M ′(ϑ) + i M ″(ϑ), is a more direct way to exhibit the frequency dispersion of the primary α-conductivity relaxation as practiced earlier for many ion-conducting glass formers. ,− It is the only representation to capture the β-conductivity relaxation if present . Therefore, the data of NaIb were presented in electric modulus formalism.…”

Section: Results and Discussionmentioning

confidence: 99%

Glassy Dynamics and Translational–Rotational Coupling of an Ionically Conducting Pharmaceutical Salt-Sodium Ibuprofen

et al. 2019

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In this work, we study the structural dipolar relaxation and ionic conductivity relaxation in an ionized derived from a nonionized glass former. The latter is the salt form of a well-studied active pharmaceutical ingredient, sodium ibuprofen, and the former is ibuprofen. Quantum mechanical calculations were employed to study the variation in its molecular electrostatic potentials, and its spatial extent on its salt formation with Na + ions. Measurements have been made using differential scanning calorimetry and broadband dielectric spectroscopy, and the characterization is assisted by density functional theory. The dielectric data contain information on both ionic and dipolar molecular mobility of NaIb and were extracted by representation in terms of the electric modulus and permittivity. A secondary β-conductivity relaxation coexists with the primary α-conductivity relaxation. By use of the coupling model, we show that the β-conductivity relaxation is connected to the α-conductivity relaxation and is the analogue of the relation of the Johari−Goldstein β-relaxation to the structural α-relaxation, shown valid also in ibuprofen. This remarkable result has an impact on the fundamental understanding of the dynamics of ionic conductivity. By representing the data as permittivity, a dipolar β-relaxation was found to have practically the same relaxation times as the β-conductivity relaxation in the glassy state and translational−rotational coupling is valid at a more local secondary relaxation level. However, the α-conductivity relaxation decouples from structural α-relaxation because the structural glass transition temperature is lower than the conductivity counterpart by 29 K. These are novel findings. The study elucidates the effects on the dynamics by the change in the nature of bonding and in size on introducing sodium ions to ibuprofen in the glassy and supercooled liquid states.

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Development of an ionogel membrane PVA/[EMIM] [SCN] with enhanced thermal stability and ionic conductivity for electrochemical application

Cited by 22 publications

References 41 publications

Color‐Customizable, Stretchable, Self‐Healable and Degradable Ionic Gel for Variable Human‐Motion Detection via Strain, Pressure, and Torsion

Color‐Customizable, Stretchable, Self‐Healable and Degradable Ionic Gel for Variable Human‐Motion Detection via Strain, Pressure, and Torsion

Effect of carvacrol in the properties of films based on poly (vinyl alcohol) with different molecular characteristics

Glassy Dynamics and Translational–Rotational Coupling of an Ionically Conducting Pharmaceutical Salt-Sodium Ibuprofen

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