Dielectric spectroscopy of water at low frequencies: The existence of an isopermitive point

Angulo-Sherman, Abril; Mercado-Uribe, Hilda

doi:10.1016/j.cplett.2011.01.027

Cited by 46 publications

(28 citation statements)

References 22 publications

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“…Polarization currents have a large and striking dependence on time in almost all materials, even in the solid phase, and is a main subject of classical work (Debye and Falkenhagen 1928, Fuoss 1949, Fröhlich 1958, Van Beek 1967, Nee and Zwanzig 1970, Böttcher, van Belle et al 1978, Barthel, Buchner et al 1995, Kurnikova, Waldeck et al 1996, Buchner and Barthel 2001, Heinz, van Gunsteren et al 2001, Kremer and Schönhals 2003, Rotenberg, Dufre Che et al 2005, Kuehn, Marohn et al 2006, Angulo-Sherman and Mercado-Uribe 2011. The practical importance of the time dependence is well known to the engineers who design solid state devices that work.…”

Section: Polarization Charge and Currentmentioning

confidence: 99%

Dynamics of Current, Charge and Mass

Eisenberg

Oriols

Ferry

2017

Computational and Mathematical Biophysics

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Electricity plays a special role in our lives and life. Equations of electron dynamics are nearly exact and apply from nuclear particles to stars. These Maxwell equations include a special term the displacement current (of vacuum). Displacement current allows electrical signals to propagate through space. Displacement current guarantees that current is exactly conserved from inside atoms to between stars, as long as current is defined as Maxwell did, as the entire source of the curl of the magnetic field. We show how the Bohm formulation of quantum mechanics allows easy definition of current. We show how conservation of current can be derived without mention of the polarization or dielectric properties of matter. Matter does not behave the way physicists of the 1800's thought it does with a single dielectric constant, a real positive number independent of everything. Charge moves in enormously complicated ways that cannot be described in that way, when studied on time scales important today for electronic technology and molecular biology. Life occurs in ionic solutions in which charge moves in response to forces not mentioned or described in the Maxwell equations, like convection and diffusion. Classical derivations of conservation of current involve classical treatments of dielectrics and polarization in nearly every textbook. Because real dielectrics do not behave in a classical way, classical derivations of conservation of current are often distrusted or even ignored. We show that current is conserved exactly in any material no matter how complex the dielectric, polarization or conduction currents are. We believe models, simulations, and computations should conserve current on all scales, as accurately as possible, because physics conserves current that way. We believe models will be much more successful if they conserve current at every level of resolution, the way physics does.Comment: Version 4 slight reformattin

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Section: Polarization Charge and Currentmentioning

confidence: 99%

Dynamics of Current, Charge and Mass

Eisenberg

Oriols

Ferry

2017

Computational and Mathematical Biophysics

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“…In addition, by decomposing the dielectric constants into four component modes, a THz TD-ATR study found the fast relaxation mode was the collisional relaxation process originating from isolated water molecules, which implied ambient water should be regarded as two component mixtures [ 51 ]. Interestingly, another dielectric study also showed a magic point, isopermitive point, and gave an explanation on this point within the framework of two-component model [ 52 ]. However, the isosbestic point can also be interpreted from the viewpoint of tetrahedral arrangement of water molecules, or in other words continuum model [ 12 ], on condition that the variations in temperature and pressure are less than 100 K and 10 4 atm, respectively [ 11 ], which is the prerequisite for the insensitivity of equilibrium distribution of relevant coordinates to the surroundings.…”

Section: Water Structure Changes With Temperaturementioning

confidence: 99%

Changes of Water Hydrogen Bond Network with Different Externalities

Zhao

Yang

2015

IJMS

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It is crucial to uncover the mystery of water cluster and structural motif to have an insight into the abundant anomalies bound to water. In this context, the analysis of influence factors is an alternative way to shed light on the nature of water clusters. Water structure has been tentatively explained within different frameworks of structural models. Based on comprehensive analysis and summary of the studies on the response of water to four externalities (i.e., temperature, pressure, solutes and external fields), the changing trends of water structure and a deduced intrinsic structural motif are put forward in this work. The variations in physicochemical and biological effects of water induced by each externality are also discussed to emphasize the role of water in our daily life. On this basis, the underlying problems that need to be further studied are formulated by pointing out the limitations attached to current study techniques and to outline prominent studies that have come up recently.

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“…The increase in C sensor by the formation of water droplets on the IDE sensor surface ( Figure 6 ) is because the low dielectric medium of air (ε r,air = 1) in the air capacitor is partly replaced by the high dielectric water (with ε r,water = 50 at 10 kHz and 26 °C [ 26 ]). As reported in prior works, ε r,water decreased exponentially with the frequency in the measured range of 0.1–10 kHz [ 26 ], while ε r,PET decreased slightly with the frequency in 0.1–100 kHz [ 24 , 25 ].…”

Section: Resultsmentioning

confidence: 99%

Effects and Mechanism of Surface Water Wettability and Operating Frequency on Response Linearity of Flexible IDE Capacitive Humidity Sensor

Yang

Han

Lim

et al. 2021

Sensors

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Flexible capacitive humidity sensors are promising for low-cost, wearable, and radio frequency identification sensors, but their nonlinear response is an important issue for practical applications. Herein, the linearity of humidity response was controlled by surface water wettability and operating frequency of sensor, and the mechanism was explained in detail by surface water condensation. For a sensor with a Ag interdigitated electrode (IDE) on a poly(ethylene terephthalate) substrate, the capacitance showed a small linear increase with humidity up to 70% RH but a large nonlinear increase in the higher range. The response linearity was increased by a hydrophobic surface treatment of self-assembled monolayer coating while it was decreased by an ultraviolet/ozone irradiation for hydrophilicity. It was also increased by increasing the frequency in the range of 1–100 kHz, more prominently on a more hydrophilic surface. Based on experiment and simulation, the increase in sensor capacitance was greatly dependent on the geometric pattern (e.g., size, number, and contact angle) and electrical permittivity of surface water droplets. A larger and more nonlinear humidity response resulted from a larger increase in the number of droplets with a smaller contact angle on a sensor surface with higher water wettability and also from a higher permittivity of water at a lower frequency.

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Dielectric spectroscopy of water at low frequencies: The existence of an isopermitive point

Cited by 46 publications

References 22 publications

Dynamics of Current, Charge and Mass

Dynamics of Current, Charge and Mass

Changes of Water Hydrogen Bond Network with Different Externalities

Effects and Mechanism of Surface Water Wettability and Operating Frequency on Response Linearity of Flexible IDE Capacitive Humidity Sensor

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