Dielectric properties of Rhodamine-B and metal doped hydrogels

Okutan, Mustafa; Coşkun, Ramazan; Öztürk, M.; Yalçın, Orhan

doi:10.1016/j.physb.2014.09.010

Cited by 24 publications

(8 citation statements)

References 49 publications

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“…The trend of ionic conductivity in the electrolyte is mainly due to the RhB, which contains free Cl − and N + ions in its structure; these ions provide an additional ionic conductivity contribution to the electrolyte. [15] In order to explore the effect of RhB on the electrochemical performance of the Li-O 2 battery, galvanostatic discharge tests were carried out. As displayed in Figure 2a,c .…”

Section: Resultsmentioning

confidence: 99%

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O₂ Batteries

Wan

Sun

Cai

et al. 2021

Adv Funct Materials

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Promoting the solution phase formation of Li 2 O 2 rather than on the cathode surface is a key issue for high-performance Li-O 2 batteries. Protic additives have been reported to guide the discharge of Li 2 O 2 in the electrolyte solution, while further advances are stalled by the intrinsical reactivity to Li metal to deteriorate the lifespan of Li-O 2 batteries. Herein, rhodamine B (RhB), a protic additive, is first introduced into electrolyte as a phase-transfer catalyst to achieve solution phase formation of Li 2 O 2 . The yield of Li 2 O 2 is 90.79%, and the discharge capacity is 46 000 mAh g carbon −1 at current density of 1000 mA g carbon −1 , which is 23-fold higher than that of blank electrolyte. Density functional theory calculations further demonstrate the feasibility of RhB to boost solution phase discharge. Most notably, the free chlorine ion in RhB assists the in situ formation of a stable Li + -conducting solid electrolyte interphase to protect Li anode from corrosion and dendrite formation during cycling. As a result, Li||Li symmetric cells exhibit a long cycle performance up to 1300 h at 1 mA cm −2 with low hysteresis voltage. Benefiting from the above results, Li-O 2 batteries with RhB present long cycle stability.

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Section: Resultsmentioning

confidence: 99%

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O₂ Batteries

Wan

Sun

Cai

et al. 2021

Adv Funct Materials

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“…These phase angles are compatible with the δ + ϕ = 90 • . [3][4][5]36 Figure 2d shows the frequency evolution of the absolute ionic conductivity (|σ|). The absolute ionic conductivity for all samples independent from frequency in the range of 10 2 Hz to 10 6 Hz.…”

Section: Resultsmentioning

confidence: 99%

“…From hence, as an unlike to our previous study, [3][4][5][6][7] in the aim of present work is to examine the influence of frequency and applied bias voltage on dielectric properties of different amount NiFe 2 O 4 NPs loaded hydrogels. The variation of the complex dielectric constant, the tangent factor, the complex electric modulus, phase angle and conductivity have been examined as a function of frequency and applied bias z E-mail: o.yalcin@ohu.edu.tr; orhanyalcin@gmail.com voltage.…”

Section: -27mentioning

confidence: 99%

“…In other words, it is suggested that the decrease in with decreasing frequency is ascribed to the gradual increase in series resistance. 39 The complex dielectric constant and tangent factor are expressed as follows and tanδ = ε (ω) ε (ω) [5] Here, ε (ω) and ε (ω) are defined as the real and the imaginary parts of the complex dielectric constant, respectively. Also, ω and i are angular frequency and the imaginary factor.…”

Section: -536mentioning

confidence: 99%

“…2 Especially, the dye ions loaded hydrogels play an important role in many areas in electronic packing, iontronics, enhance organic electronic performance devices, optoelectronics, microelectronics, brain electronics and microbial fuel cells applications. [3][4][5][6][7] Furthermore, the applications of nanoparticles loaded materials in the form of powders, tubes, fiber and spheres are receiving a great deal of interest in nanoscience and nanotechnology. 8,9 The nanostructure loaded hydrogels have many applications such as high-efficiency an alkaline phosphatase (ALP) sensor, 10 luminescent gels, 11 pulsatile drug release, 12 microwave and biomedical applications, 13 various electronic devices, 14,15 introduction of strong ionic coordination interactions, 16 energy store applications 17 in the technology.…”

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Optic and Dielectric Properties of Different Amount NiFe₂O₄Nanoparticles Loaded Hydrogels: Synthetic Circuits Applications

Okutan¹,

Coşkun²,

Öztürk³

et al. 2018

ECS J. Solid State Sci. Technol.

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Loaded hydrogels with different amount (2.5%, 5.0%, 7.5% and 10.0%) NiFe 2 O 4 nanoparticles have been prepared for elastic optoelectronic devices in nano size via the copolymerization technics. All samples have been characterized by the UV-Vis absorption spectroscopy. The resistance changes were analyzed by calculating from the slope of the current-voltage plots. The optical band gaps of the NiFe 2 O 4 nanoparticles loaded hydrogels decreases with increase of loading of nanoparticles amount. At room temperature (RT), frequency and applied bias voltage dependence of complex impedance, electric modulus, tangent factor and ionic conductivity have been studied with the impedance spectroscopy (IS). In addition, frequency and applied bias voltage of dependence on dielectric properties for NiFe 2 O 4 nanoparticles loaded hydrogels were compared with each other. Frequency evolution of the dielectric properties are drastically effected interface and electrode polarization. The lowest and highest values of the ε and ε were determined for 10% and 2.5% loaded NiFe 2 O 4 nanoparticles depend on applied bias voltage. The complex impedance based Cole-Cole diagrams and their adopted to Smith-Chart have been analyzed for synthetic equivalent resistance-capacitance circuits via frequency. The UV-Vis absorption values decreases and the conductivity values increases with increase because of increasing NiFe 2 O 4 nanoparticles amount and the grain size of loaded hydrogels structure in general. Different amount NiFe 2 O 4 nanoparticles loaded hydrogels will provide great benefits for optoelectronics and non-linear optical applications in the nanotechnology and photovoltaic devices. The different amount ionic materials loaded hydrogels can be categorized as non-ionic, ionic, zwitterionic and amphoteric electrolyte according to existence or absence of electrical charge in their chains.2 Especially, the dye ions loaded hydrogels play an important role in many areas in electronic packing, iontronics, enhance organic electronic performance devices, optoelectronics, microelectronics, brain electronics and microbial fuel cells applications.3-7 Furthermore, the applications of nanoparticles loaded materials in the form of powders, tubes, fiber and spheres are receiving a great deal of interest in nanoscience and nanotechnology. 8,9 The nanostructure loaded hydrogels have many applications such as high-efficiency an alkaline phosphatase (ALP) sensor, 10 23 and photoelectric devices 24 due to its high or low dielectric constants. Also, nano particle loaded dielectric materials in the visible spectral region can be made transparent electrically conductive. These materials are used as flat panel displays and the transparent conductive electrodes in solar cells. 25-27The dielectric properties and their technological applications of the NiFe 2 O 4 nanoparticles (NPs) loaded hydrogels have not been detailed examination depending on frequency and bias voltage so far. From hence, as an unlike to our previous study, [3][4][5][6][7] in the aim of pre...

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Adaptive Deformation of Ionic Domains in Hydrogel Enforcing Dielectric Coupling for Sensitive Response to Mechanical Stretching

Wang

Zeng

Liu

et al. 2020

Advanced Intelligent Systems

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Understanding the role of ionic migration in salt‐doped hydrogels is crucial for designing and using ionic skins. This study systematically investigates a typical ionic skin in the aspects of variations in capacitance and conductance with respect to stretch ratio. The ionic skin exhibits a sensitive response to the stretch ratio and input frequency. The capacitance can increase by 145% with increasing stretch ratio, whereas the ratio of capacitance variation to stretch ratio can exceed ≈0.25. The capacitance decreases with increasing frequency, whereas conductance increases. Capacitance or conductance with respect to stretch ratio exhibits an inflection point when the input frequency is fixed. Herein, an ionic domain model is proposed in which the ionic domains deform adaptively with global strain and released active ions. A portion of movable ions strengthens dielectric coupling, thereby significantly enhancing capacitance, and some of them act as free ion channels to increase conductance. The dielectric coupling is weakened when the active ions arriving at the electrode are depleted by either a significantly high frequency or large strain. This study will be useful for signal handling in ionic skin with high flux and high sensitivity and may also assist in understanding computing and memory principles of biological bodies.

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Dielectric properties of Rhodamine-B and metal doped hydrogels

Cited by 24 publications

References 49 publications

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O₂ Batteries

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O₂ Batteries

Optic and Dielectric Properties of Different Amount NiFe₂O₄Nanoparticles Loaded Hydrogels: Synthetic Circuits Applications

Adaptive Deformation of Ionic Domains in Hydrogel Enforcing Dielectric Coupling for Sensitive Response to Mechanical Stretching

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Dielectric properties of Rhodamine-B and metal doped hydrogels

Cited by 24 publications

References 49 publications

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O2 Batteries

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O2 Batteries

Optic and Dielectric Properties of Different Amount NiFe2O4Nanoparticles Loaded Hydrogels: Synthetic Circuits Applications

Adaptive Deformation of Ionic Domains in Hydrogel Enforcing Dielectric Coupling for Sensitive Response to Mechanical Stretching

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Product

Resources

About

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O₂ Batteries

A Friendly Soluble Protic Additive Enabling High Discharge Capability and Stabilizing Li Metal Anodes in Li–O₂ Batteries

Optic and Dielectric Properties of Different Amount NiFe₂O₄Nanoparticles Loaded Hydrogels: Synthetic Circuits Applications