THE TEMPERATURE DEPENDENCE OF APPARENT DIELECTRIC CONSTANTS OF ADSORBATES ON NON-POROUS TITANIUM DIOXIDE

1957 ◽  
Vol 35 (12) ◽  
pp. 1534-1541 ◽  
Author(s):  
S. E. Petrie ◽  
R. McIntosh ◽  
E. W. Channen
Keyword(s):  
Dielectric Constant ◽  
Titanium Dioxide ◽  
Temperature Dependence ◽  
Experimental Error ◽  
Adsorption Process ◽  
Porous Titanium ◽  
Dielectric Constants ◽  
Effect Of Temperature ◽  
Apparent Dielectric Constant

The temperature dependence of the apparent dielectric constants of various adsorbed polar gases on finely divided, non-porous titanium dioxide has been determined. Within the experimental error, the apparent dielectric constant of the material adsorbed in the monolayer is independent of temperature. The effect of temperature on the dielectric constant for gas adsorbed beyond the monolayer depends on the adsorbate. These results have been interpreted as indicating that molecules initially adsorbed are oscillators, while those adsorbed in later stages of the adsorption process may be rotators or oscillators.

scholarly journals Protein Apparent Dielectric Constant and Its Temperature Dependence from Remote Chemical Shift Effects

2014 ◽  
Vol 136 (37) ◽  
pp. 12816-12819 ◽  
Author(s):  
Liaoyuan An ◽  
Yefei Wang ◽  
Ning Zhang ◽  
Shihai Yan ◽  
Ad Bax ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Chemical Shift ◽  
Temperature Dependence ◽  
Apparent Dielectric Constant

Temperature Dependence of Optical Constants of Silver Film Studied by In Situ Spectroscopic Ellipsometry

2008 ◽  
Vol 55-57 ◽  
pp. 445-448 ◽  
Author(s):  
S. Rojebuathong ◽  
P. Chindaudom ◽  
W. Luangtip ◽  
M. Horphatum ◽  
P. Eiamchai ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence ◽  
Imaginary Part ◽  
Spectroscopic Ellipsometry ◽  
Silver Film ◽  
Dielectric Constants ◽  
Nitrogen Gas ◽  
Scattering Time ◽  
Ag Film

A silver film was deposited on silicon wafer by DC unbalance magnetron sputtering system. The temperature dependence of the silver film was investigated. The spectroscopic ellipsometry (SE) with the heating of sample stage (HTC100) was employed for the in situ SE measurement under annealing cycles of the sample from room temperature to 300°C in dry nitrogen gas. The results show that the pseudo dielectric constants (<ε1>, < ε2>) of the sample varied with an annealing temperature. The real part of pseudo dielectric constant (<ε1>) of annealed Ag film was slightly changed and the imaginary part (< ε2>) was strongly increased at a photon energy below the optical band gap (3.5-4.5 eV). Furthermore, the pseudo dielectric constant of imaginary part at low energy region was changed due to the enhancement of crystallinity of Ag film at 300°C. All measured SE spectra were fitted by Drude-Lorentz optical model, the scattering time and resistivity were obtained.

scholarly journals Dielectric constants of solids at high frequencies and the influence of water of crystallization on dielectric constant

1937 ◽  
Vol 158 (893) ◽  
pp. 182-198 ◽  
Keyword(s):  
Dielectric Constant ◽  
Experimental Error ◽  
Dielectric Constants ◽  
The Other ◽  
High Frequencies ◽  
Influence Of Water

The determination of the dielectric constant of one constituent of a mixture, when the dielectric constants of the other component and the mixture itself are known, has been a problem which has been given much attention for many years. The familiar Clausius-Mossotti relationship for the dielectric constant of any substance is: ε-1/(ε + 2) d = A, where ε is the dielectric constant of the substance, d the density, and A a constant depending upon the polarizability of the molecule. This relation was developed independently by Clausius, Mossotti, Lorenz, Lorentz, Rayleigh, and Debye; but even in the case of pure liquids deviations well outside the experimental error have been found.

Temperature dependence of dielectric properties of some wood species at low frequency range

2011 ◽  
Vol 1 (2) ◽  
pp. 73-76
Author(s):  
V.B. Marella ◽  
R. Jeevan Kumar ◽  
Adeel Ahmad
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Wood Species ◽  
Low Frequency ◽  
Tectona Grandis ◽  
Tangential Direction ◽  
Dielectric Constants ◽  
Effect Of Temperature ◽  
Dielectric Parameters

The effect of temperature on the dielectric properties of some wood species such as Kadam ( Haldina cordifolia), Teak (Tectona grandis L) and Sal tree (Shorea robusta)) wood were investigated at different frequencies from 100Hz to 1MHz along tangential direction. Dielectric constants and dielectric loss factors were measured at temperatures from 30o C to 120°C with variation of frequency showing increase in dielectric constant and dielectric loss with the increase of temperature. Dielectric properties on wood showed a strong relation dependence on the structures, water‐wood relations, frequency and temperature. A significant variation in dielectric parameters was observed with respect to each species. An abrupt increase in dielectric constant was observed when frequency was less than 1 kHz. The variation in activation energy is observed from one species to other.

scholarly journals On the dielectric constant of titanium dioxide

2021 ◽  
Author(s):  
Julie Bonkerud ◽  
Christian Zimmermann ◽  
Philip Michael Weiser ◽  
Lasse Vines ◽  
Eduard V. Monakhov
Keyword(s):  
Dielectric Constant ◽  
Titanium Dioxide ◽  
Temperature Dependence ◽  
High Dielectric Constant ◽  
Static Dielectric Constant ◽  
Rutile Tio2 ◽  
Doped Tio2 ◽  
Capacitance Voltage ◽  
Hydrogen Implantation ◽  
High Dielectric

Abstract Conductive rutile TiO2 has received considerable attention recently due to a number of applications. However, the static dielectric constant in conductive, reduced or doped TiO2 appears to cause controversy with reported values in the range 100-10000. In this work, we propose a method for measurements of the dielectric constant in conductive, n-type TiO2 that involves: (i) hydrogen implantation to form a donor profile at a known depth, and (ii) capacitance-voltage measurements for donor profiling. We can not confirm the claims stating an extremely high dielectric constant. On the contrary, the dielectric constant of conductive, reduced rutile TiO2 is similar to that of insulating rutile TiO2 established previously, with a Curie-Weiss type temperature dependence and the values in the range 160-240 along the c-axis.

scholarly journals Effect of temperature on the binding energy of a shallow hydrogenic impurity in a quantum well wire

2009 ◽  
Vol 87 (11) ◽  
pp. 1159-1161 ◽  
Author(s):  
T. G. Emam
Keyword(s):  
Binding Energy ◽  
Quantum Well ◽  
Temperature Dependence ◽  
Dielectric Constants ◽  
Effect Of Temperature ◽  
Wire Radius ◽  
Hydrogenic Impurity ◽  
Quantum Well Wire ◽  
Barrier Region ◽  
Temperature Dependance

In this work, we investigate the variation of the binding energy of an on-axis hydrogenic impurity in a cylindrical semiconductor GaAsalxGa1–xAs quantum well wire (QWW) with temperature, by taking into account the temperature dependance of the electron masses and dielectric constants in the quantum well and potential barrier region as well as the temperature dependence of the barrier height. This investigation is important in understanding the role such impurities can play in determining the transport properties of such systems. The results show enhancement of the binding energy as the temperature is decreased, specially for small values of wire radius.

scholarly journals Dielectric properties assessment of honey by using non-destructive dielectric spectroscopy

2022 ◽  
Vol 12 (1) ◽  
pp. 189
Author(s):  
Aslina Abu Bakar ◽  
Muhammad Aiman Najmi bin Rodzali ◽  
Rosfariza Radzali ◽  
Azlina Idris ◽  
Ahmad Rashidy Razali
Keyword(s):  
Dielectric Constant ◽  
Water Content ◽  
Measurement Technique ◽  
Water Concentration ◽  
Dielectric Constants ◽  
Effect Of Temperature ◽  
Frequency Range ◽  
Calibration Methods ◽  
Destructive Measurement ◽  
Non Destructive

<p>In this research the dielectric constant of three types of Malaysian honey has been investigated using a non-destructive measurement technique. The objective of this research is to assess the dielectric constant of the three types of honey in Malaysia using a non-destructive measurement technique known as an open-ended coaxial probe in the frequency range from 100 MHz to 10 GHz frequency. Analysis on the effect water concentration in honey on the dielectric constant and the effect of temperature on dielectric constant of honey has been conducted. The three types of honey that have been chosen to be investigated in this project are stingless bee honey, wild honey and commercial (organic) honey and together their water adulterated samples. For this research, the probe had been set up by setting a range of frequency from 100 MHz to 10 GHz and needs to be calibrated with three calibration methods namely open, short and reference water. From the result it was found that the higher the temperature of the honey and the higher percentage of water content in the honey, the dielectric constant is increased. The dielectric constants of all honeys decreased with increasing frequency in the measured frequency range and increased with increase percentage of water content and temperature.</p>

scholarly journals Investigation of temperature effect on the electrical conductivity of solutions inorganic salts in ethanol

2020 ◽  
Vol 61 (1) ◽  
pp. 76-80
Author(s):  
Vera A. Petrukhina ◽  
◽  
Ksenia A. Konnova ◽  
Maria V. Yakimova ◽  
Nikolay I. Koltsov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Aqueous Solutions ◽  
Temperature Dependence ◽  
Arrhenius Equation ◽  
Calcium Nitrate ◽  
Effect Of Temperature ◽  
Inorganic Salts ◽  
Salt Solutions ◽  
Weak Electrolytes

The electrical conductivity of the solutions depends on the nature of the solute and solvent. For a solvent, the main parameter is the dielectric constant. Since the dielectric constant of alcohols is much less than the dielectric constant of water, the electrical conductivity of alcoholic solutions of salts is less than the electrical conductivity of their aqueous solutions. Therefore, alcoholic solutions of inorganic salts are weak electrolytes. We previously studied the electrical conductivity of inorganic salts in a number of alcohols (ethanol, propanol-2 and butanol-1) at room temperature. It is of interest to study the effect of temperature on the electrical conductivity of salts in alcohols. Obviously, an increase of temperature salt solutions leads to an increase in their electrical conductivity. To study the temperature dependence of the electrical conductivity of aqueous solutions electrolytes, we proposed an approach based on the study of the effect of temperature on the equivalent electrical conductivity of solutions at infinite dilution λ∞. Using this approach, we studied the electrical conductivity of aqueous solutions of a number of inorganic salts, carboxylic acids, and amino acids as a function of temperature. It has been established that for these solutions the dependence λ∞(Т) is described by the exponential Arrhenius equation λ∞ = Аexp(-E/(RT)). However, such studies have not been conducted for alcoholic salt solutions. In this regard, this article explores the possibility of describing the experimental data λ∞(Т) for solutions of certain inorganic salts in ethanol by this equation. It is shown that the Arrhenius equation with the found activation energies adequately describes the temperature dependence of the ultimate equivalent conductivity for solutions of a number of inorganic salts (chloride and calcium nitrate, cadmium iodide, lithium and potassium chloride, chloride, iodide and ammonium nitrate, silver nitrate and sodium bromide) in ethyl alcohol.

scholarly journals Comment on “investigation of dielectric constants of water in a nano-confined pore” by H. Zhu, F. Yang, Y. Zhu, A. Li, W. He, J. Huang and G. Li, RSC Adv., 2020, 10, 8628

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 5179-5181
Author(s):  
Sayantan Mondal ◽  
Biman Bagchi
Keyword(s):  
Dielectric Constant ◽  
Dielectric Constants ◽  
Static Dielectric Constant ◽  
Inherent Anisotropy ◽  
Nanoconfined Water

Neglects of inherent anisotropy and distinct dielectric boundaries may lead to completely erroneous results. We demonstrate that such mistakes can give rise to gross underestimation of the static dielectric constant of cylindrically nanoconfined water.

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