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Artículos de revistas sobre el tema "Broadbnad dielectric spectroscopy"

Autor: Grafiati
Publicado: 30 de noviembre de 2024

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1

Labardi, M., M. Lucchesi, D. Prevosto y S. Capaccioli. "Broadband local dielectric spectroscopy". Applied Physics Letters 108, n.º 18 (2 de mayo de 2016): 182906. http://dx.doi.org/10.1063/1.4948767.

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2

Badot, J. C. "Broadband Dielectric Spectroscopy of Inorganic Solids". Materials Science Forum 518 (julio de 2006): 439–46. http://dx.doi.org/10.4028/www.scientific.net/msf.518.439.

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This paper deals with the fundamental aspect of dielectric relaxations in conducting inorganic solids. It has been shown that it is possible to evidence dielectric relaxations due to charge carriers such as electrons (small-polarons) and ions, dipole reorientations (e.g. water molecules in hydrates) and to interfacial polarization phenomena (e.g. grain boundaries) in polycrystalline compounds. The importance of all these phenomena is discussed in relation to their possible interventions in dielectric spectra.
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3

Jayabal, Ezhilan, Rajesh Rajendiran y Venkatesan Rengarajan. "Study of Electronic and Magnetic Properties of Nitrogen Doped Graphene Oxide". Advanced Materials Research 938 (junio de 2014): 97–102. http://dx.doi.org/10.4028/www.scientific.net/amr.938.97.

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The Nitrogen doped graphene oxide (NGO) was synthesized by doping N-atoms on graphene oxide (GO) sheet by using melamine which serves as the nitrogen source, through hydrothermal approach. The insertion of nitrogen atoms into the graphene oxide sheet was confirmed by FT-IR, EDS and Raman spectroscopic techniques. We also probed into the tuned dielectric and magnetic properties of NGO due to the decomposition of oxy functional groups of GO and the insertion of pyridinic, pyrrolic and graphitic type nitrogen atoms into the graphitic structure. The dielectric properties were measured by Broadband Dielectric Spectroscopy (BDS). The magnetic behaviour of the sample was demonstrated by Vibrational Scanning Magnetometer (VSM).
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4

Erdem, Özlen F., André Pampel y Dieter Michel. "Slow Motion of Confined Molecules: NMR and Broadband Dielectric Spectroscopy Investigations". Journal of Nanoscience and Nanotechnology 8, n.º 2 (1 de febrero de 2008): 887–93. http://dx.doi.org/10.1166/jnn.2008.d003.

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Nuclear magnetic resonance (NMR) and broadband dielectric spectroscopy are used to investigate the dynamics of small glass-forming molecules confined to restricted geometries. Ethylene glycol molecules are embedded in the supercages of NaX zeolites. The combined application of NMR and broadband dielectric spectroscopy advances the understanding of the slowing down of the motion near the glass transition temperature of these confined molecules. In combination with nuclear spin relaxation and nuclear magnetic resonance spectroscopy, dielectric relaxation studies on glass forming molecules allow conclusions on the character of the motion. High resolution 1H magic angle spinning (MAS) NMR measurements not only enable a characterisation of the state of the adsorbed molecules via a chemical shift analysis. By means of an analysis of MAS spinning sidebands we may also estimate a correlation time the meaning of which will be discussed in comparison to the results of longitudinal proton spin relaxation measurements. In addition to broadband dielectric spectroscopy slow molecular motions of partially deuterated ethylene glycol adsorbed in NaX are studied by means of 2H NMR line-shape analysis.
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5

Bogolitsyn, K. G., S. S. Khviyuzov, A. S. Volkov, G. D. Koposov y M. A. Gusakova. "Broadband Dielectric Spectroscopy of Lignin". Russian Journal of Physical Chemistry A 93, n.º 2 (febrero de 2019): 353–58. http://dx.doi.org/10.1134/s0036024419020055.

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6

Volkov, A. A. y A. S. Prokhorov. "Broadband Dielectric Spectroscopy of Solids". Radiophysics and Quantum Electronics 46, n.º 8/9 (agosto de 2003): 657–65. http://dx.doi.org/10.1023/b:raqe.0000024994.15881.c9.

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7

Mukherjee, S., P. Watson y R. J. Prance. "Microscopic resolution broadband dielectric spectroscopy". Journal of Physics: Conference Series 310 (12 de agosto de 2011): 012003. http://dx.doi.org/10.1088/1742-6596/310/1/012003.

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8

Schreiner, Thomas Gabriel y Maricel Adam. "Broadband Dielectric Spectroscopy and Its Role in the Characterization of Biological Cells". Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section 67, n.º 1 (1 de marzo de 2021): 9–20. http://dx.doi.org/10.2478/bipie-2021-0001.

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Abstract Broadband dielectric spectroscopy (BDS) is a method of characterizing matter from the perspective of its dielectric parameters, which varies depending on the frequency of the applied electromagnetic field. During recent years, along with its many uses, there has been an increase in interest in the use of the method in biomedical fields, especially for the characterization of normal and tumor cells. In this context, this review aims to address in the first part the theoretical bases and mathematical models that explain the principle of operation of the broadband spectroscope. Subsequently, the advantages and limitations of the method are detailed, including the difficulties that the researcher may encounter in the case of working with living cells. Finally, the most important scientific results obtained on normal and pathological cell cultures are presented, possible future research directions being suggested.
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9

Pan, Hailong, Jiangshui Luo, Bing Li y Michael Wübbenhorst. "Phase-dependent dielectric properties and proton conduction of neopentyl glycol". RSC Advances 11, n.º 38 (2021): 23228–34. http://dx.doi.org/10.1039/d1ra03366b.

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10

Rajab, Khalid Z., Mira Naftaly, Edmund H. Linfield, Juan C. Nino, Daniel Arenas, David Tanner, Raj Mittra y Michael Lanagan. "Broadband Dielectric Characterization of Aluminum Oxide (Al2O3)". Journal of Microelectronics and Electronic Packaging 5, n.º 1 (1 de enero de 2008): 2–7. http://dx.doi.org/10.4071/1551-4897-5.1.1.

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Applications for low-temperature cofired ceramics (LTCC) and high-temperature cofired ceramics (HTCC) are advancing to higher frequencies. In order to design ceramic microsystems and electronic packages, the electrical properties of materials must be well characterized over a broad frequency range. In this study, the dielectric properties of commercial aluminum oxide (Al2O3) with different glass loadings are characterized using three different measurement techniques: the split-post cavity, terahertz (THz) time-domain spectroscopy, and Fourier transform IR spectroscopy (FTIR). Specifically, the dielectric properties will be characterized from 10 GHz to IR frequencies. A split-post cavity was employed for determination of dielectric properties in the 10 GHz range. A broadband THz spectroscopy technique was used to characterize the specimens using measured time-domain transmission data. The dielectric constant and loss were extracted from the sample's frequency-domain transmission characteristics, providing data between 100 GHz and 2 THz. Additionally, FTIR was used to characterize the samples from ~33 to 3300 cm−1 (~1–100 THz). The measurements from the three techniques are compared, and dielectric constant and loss data will be presented for commercial and experimental ceramic systems from 10 GHz to IR frequencies.
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11

Lin, Y., A. Daoudi, F. Dubois, J. F. Blach, J. F. Henninot, O. Kurochkin, A. Grabar, A. Segovia-Mera, C. Legrand y R. Douali. "A comparative study of nematic liquid crystals doped with harvested and non-harvested ferroelectric nanoparticles: phase transitions and dielectric properties". RSC Advances 7, n.º 56 (2017): 35438–44. http://dx.doi.org/10.1039/c7ra04154c.

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Broadband dielectric spectroscopy is used to determine the dielectric properties and phase transitions of the 4-n-octyl-4′-cyanobiphenyl liquid crystal (8CB) doped with harvested and non-harvested ferroelectric nanoparticles.
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12

Wang, Jianhua, Wen Sun, Binkai Chen y Lingling Sun. "A method for extracting the 1-60 GHz dielectric spectrum of trace liquids using standard design coplanar waveguide sensing devices". Journal of Physics: Conference Series 2809, n.º 1 (1 de agosto de 2024): 012043. http://dx.doi.org/10.1088/1742-6596/2809/1/012043.

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Abstract This paper introduces a sensor designed for measuring the dielectric constant of small amounts of liquid. The sensor consists of a coplanar waveguide transmission line and an open container for the liquid, enabling broadband dielectric spectroscopy measurements for milliliter-scale liquids in the 1-60 GHz range. To improve the accuracy of dielectric spectroscopy testing, the sensor is calibrated using air and deionized water to obtain a coefficient matrix relating the sensor’s distributed parameters to the sample’s dielectric constant. This matrix is then used to calculate the dielectric spectroscopy of subsequent test samples. Tests on the dielectric spectroscopy of deionized water with this sensor and algorithm indicate that over the 1-60 GHz band, the error compared to previous literature results is within 5%, demonstrating the reliability of the proposed sensor and dielectric spectroscopy extraction algorithm.
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13

Baeza, Guilhem P., Julian Oberdisse, Angel Alegria, Marc Couty y Anne-Caroline Genix. "A high-temperature dielectric process as a probe of large-scale silica filler structure in simplified industrial nanocomposites". Physical Chemistry Chemical Physics 17, n.º 3 (2015): 1660–66. http://dx.doi.org/10.1039/c4cp04597a.

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The existence of two independent filler-dependent high-temperature Maxwell–Wagner–Sillars dielectric processes is demonstrated and characterized in detail in simplified silica-filled styrene–butadiene industrial nanocomposites using Broadband Dielectric Spectroscopy.
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14

Youngs, I. J., C. R. Lawrence, A. S. Treen, T. Stickland y M. Miah. "Broadband dielectric spectroscopy of conducting polyaniline". IEE Proceedings - Science, Measurement and Technology 145, n.º 4 (1998): 166. http://dx.doi.org/10.1049/ip-smt:19982102.

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15

Bao, Xiue, Ilja Ocket, Juncheng Bao, Jordi Doijen, Ju Zheng, Dries Kil, Zhuangzhuang Liu, Bob Puers, Dominique Schreurs y Bart Nauwelaers. "Broadband Dielectric Spectroscopy of Cell Cultures". IEEE Transactions on Microwave Theory and Techniques 66, n.º 12 (diciembre de 2018): 5750–59. http://dx.doi.org/10.1109/tmtt.2018.2873395.

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16

Wolf, M., R. Gulich, P. Lunkenheimer y A. Loidl. "Broadband dielectric spectroscopy on human blood". Biochimica et Biophysica Acta (BBA) - General Subjects 1810, n.º 8 (agosto de 2011): 727–40. http://dx.doi.org/10.1016/j.bbagen.2011.05.012.

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17

Grigalaitis, R., J. Banys, A. Sternberg, K. Bormanis y V. Zauls. "Broadband dielectric spectroscopy of PSN ceramics". Journal of the European Ceramic Society 27, n.º 13-15 (enero de 2007): 4383–89. http://dx.doi.org/10.1016/j.jeurceramsoc.2007.02.166.

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18

Sarkar, Sohini, Debasis Saha, Sneha Banerjee, Arnab Mukherjee y Pankaj Mandal. "Broadband terahertz dielectric spectroscopy of alcohols". Chemical Physics Letters 678 (junio de 2017): 65–71. http://dx.doi.org/10.1016/j.cplett.2017.04.026.

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19

Vidjak, Klementina, Carolin Hessinger y Marta Cavagnaro. "Broadband Dielectric Spectroscopy with a Microwave Ablation Antenna". Sensors 23, n.º 5 (26 de febrero de 2023): 2579. http://dx.doi.org/10.3390/s23052579.

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Microwave ablation is a technique used to treat tumorous tissue. Its clinical use has been greatly expanding in the last few years. Because the design of the ablation antenna and the success of the treatment greatly depend on the accurate knowledge of the dielectric properties of the tissue being treated, it is highly valuable to have a microwave ablation antenna that is also able to perform in-situ dielectric spectroscopy. In this work, an open-ended coaxial slot ablation antenna design operating at 5.8 GHz is adopted from previous work, and its sensing abilities and limitations are investigated in respect of the dimensions of the material under test. Numerical simulations were performed to investigate the functionality of the floating sleeve of the antenna and to find the optimal de-embedding model and calibration option for obtaining accurate dielectric properties of the area of interest. Results show that, as in the case of the open-ended coaxial probe, the accuracy of the measurement greatly depends on the likeness between the calibration standards’ dielectric properties and the material under test. Finally, the results of this paper clarify to which extent the antenna can be used to measure dielectric properties and paves the way to future improvements and the introduction of this functionality into microwave thermal ablation treatments.
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20

Leitis, Aleksandrs, Andreas Tittl, Mingkai Liu, Bang Hyun Lee, Man Bock Gu, Yuri S. Kivshar y Hatice Altug. "Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval". Science Advances 5, n.º 5 (mayo de 2019): eaaw2871. http://dx.doi.org/10.1126/sciadv.aaw2871.

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Infrared spectroscopy resolves the structure of molecules by detecting their characteristic vibrational fingerprints. Subwavelength light confinement and nanophotonic enhancement have extended the scope of this technique for monolayer studies. However, current approaches still require complex spectroscopic equipment or tunable light sources. Here, we introduce a novel metasurface-based method for detecting molecular absorption fingerprints over a broad spectrum, which combines the device-level simplicity of state-of-the-art angle-scanning refractometric sensors with the chemical specificity of infrared spectroscopy. Specifically, we develop germanium-based high-Q metasurfaces capable of delivering a multitude of spectrally selective and surface-sensitive resonances between 1100 and 1800 cm−1. We use this approach to detect distinct absorption signatures of different interacting analytes including proteins, aptamers, and polylysine. In combination with broadband incoherent illumination and detection, our method correlates the total reflectance signal at each incidence angle with the strength of the molecular absorption, enabling spectrometer-less operation in a compact angle-scanning configuration ideally suited for field-deployable applications.
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21

Okutan, M., Z. Yalçın, O. İçelli, F. Ay, R. Boncukçuoğlu, O. Artun y D. Delipınar. "Electrical Behavior of Probertite by Dielectric Spectroscopy". High Temperature Materials and Processes 33, n.º 6 (1 de diciembre de 2014): 545–52. http://dx.doi.org/10.1515/htmp-2013-0121.

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AbstractIn this work of the material investigation, electrical parameters, which are real part and imaginary part of modulus, dielectric constant, dissipation factor, and conductivity, in the bulk pellet of probertite sample is presented. Electrical properties were investigated via temperature and frequency dependent dielectric spectroscopy. Real and imaginary part of dielectric parameter properties of the probertite were measured at frequencies from 100 to 15M Hz in the temperature range of 25 to 150 °C. Temperature dependence of the real part of the dielectric constant suggests that these compounds exhibit strong electromagnetic absorption and broadband electrical behavior.
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22

Kipnusu, Wycliffe K., Mohamed Elsayed, Ciprian Iacob, Sebastian Pawlus, Reinhard Krause-Rehberg y Marian Paluch. "Glassy dynamics predicted by mutual role of free and activation volumes". Soft Matter 15, n.º 23 (2019): 4656–61. http://dx.doi.org/10.1039/c9sm00363k.

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Broadband Dielectric Spectroscopy (BDS) at elevated pressures and Positron Annihilation Lifetime Spectroscopy (PALS) are employed to elucidate the importance of the ratio of activation and free volumes during vitrification.
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23

Koutras, Konstantinos N., Sokratis N. Tegopoulos, Vasilios P. Charalampakos, Apostolos Kyritsis, Ioannis F. Gonos y Eleftheria C. Pyrgioti. "Breakdown Performance and Partial Discharge Development in Transformer Oil-Based Metal Carbide Nanofluids". Nanomaterials 12, n.º 2 (14 de enero de 2022): 269. http://dx.doi.org/10.3390/nano12020269.

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In this work, the influence of semi-conductive SiC nanoparticles on the AC breakdown voltage and partial discharge development in natural ester oil FR3 is examined. Primarily, the dielectric constant and the electrical conductivity of the nanoparticles are measured following the broadband dielectric spectroscopy technique. The nanoparticles are added into the matrix following the ultrasonication process in three weight percentage ratios in order for their effect to be evaluated as a function of their concentration inside the base oil. The processing of the results reveals that the nanofluid containing SiC nanoparticles at 0.004% w/w demonstrates the highest AC dielectric strength improvement and shows the greatest resistance to the appearance of partial discharge activity. The mechanisms behind the aforementioned results are discussed in detail and confirmed by the broadband dielectric spectroscopy technique, which reveals that this particular nanofluid sample is characterized by lower dielectric constant and electrical conductivity than the one with double the weight percentage ratio.
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24

Yang, Jie, Xiang Yun Deng, Jian Bao Li, Qiang Cai, Hai Tao Zhang, Li Ming Wang, Kui Fan Su, Guo Qing Zhang y Chun Peng Wang. "Broadband Dielectric Spectroscopy Analysis of Dielectric Properties of Barium Titanate Ceramics". Advanced Materials Research 744 (agosto de 2013): 323–28. http://dx.doi.org/10.4028/www.scientific.net/amr.744.323.

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The complex dielectric behaviors of ferroelectric barium titanate (BT) ceramics were investigated. The dielectric properties were studied as a function of temperature and frequency using broadband dielectric spectrometer. The results show that the maximum value of dielectric constant occurs at 500nm BT ceramics, which is approximately 7,500; the dielectric loss is lower than 0.03 with the temperature varying from 225 K to 450 K. Dielectric constant and dielectric loss experience three dielectric peaks corresponding to rhombohedral to orthorhombic, tetragonal and cubic transitions. With the frequency ranges from 1 MHz to 1 GHz, the dielectric relaxation is apparently present. The relaxation process obeys Cole-Cole relaxation model at high temperature and conforms to Debye relaxation model when the temperature far lower than Curie temperature. The relaxation time is the order magnitude of ~10-9s obtained by Havriliak-Negami function fitting, which is very consistent with theoretical calculation.
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25

Śmiszek-Lindert, Wioleta Edyta, Ewa Kamińska, Aldona Minecka, Dawid Heczko, Olga Madejczyk, Magdalena Tarnacka, Karolina Jurkiewicz, Andrzej Dzienia, Kamil Kamiński y Marian Paluch. "Studies on dynamics and isomerism in supercooled photochromic compound Aberchrome 670 with the use of different experimental techniques". Physical Chemistry Chemical Physics 20, n.º 26 (2018): 18009–19. http://dx.doi.org/10.1039/c8cp02993h.

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26

Lunkenheimer, P., A. Pimenov, M. Dressel, B. Schiener, U. Schneider y A. Loidl. "Broadband Dielectric Spectroscopy on Glass Forming Liquids". Progress of Theoretical Physics Supplement 126 (1997): 123–31. http://dx.doi.org/10.1143/ptps.126.123.

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27

MIKONIS, A., J. MACUTKEVIC, R. GRIGALAITIS, J. BANYS, R. ADOMAVICIUS, A. KROTKUS, A. N. SALAK, N. P. VYSHATKO y D. D. KHALYAVIN. "BROADBAND DIELECTRIC SPECTROSCOPY OF La1/3NbO3 CERAMICS". Integrated Ferroelectrics 109, n.º 1 (25 de noviembre de 2009): 55–60. http://dx.doi.org/10.1080/10584580903432551.

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28

Kundu, Shyamal Kumar y Shin Yagihara. "Broadband Dielectric Spectroscopy of Ferroelectric Liquid Crystal". Japanese Journal of Applied Physics 46, n.º 5B (17 de mayo de 2007): 3211–13. http://dx.doi.org/10.1143/jjap.46.3211.

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29

Lunkenheimer, P., A. Pimenov, M. Dressel, B. Schiener, U. Schneider y A. Loidl. "Broadband Dielectric Spectroscopy on Glass Forming Liquids". Progress of Theoretical Physics Supplement 126 (16 de mayo de 2013): 123–31. http://dx.doi.org/10.1143/ptp.126.123.

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30

Aliev, F. M., Z. Nazario y G. P. Sinha. "Broadband dielectric spectroscopy of confined liquid crystals". Journal of Non-Crystalline Solids 305, n.º 1-3 (julio de 2002): 218–25. http://dx.doi.org/10.1016/s0022-3093(02)01095-5.

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31

Emmert, S., M. Wolf, R. Gulich, S. Krohns, S. Kastner, P. Lunkenheimer y A. Loidl. "Electrode polarization effects in broadband dielectric spectroscopy". European Physical Journal B 83, n.º 2 (septiembre de 2011): 157–65. http://dx.doi.org/10.1140/epjb/e2011-20439-8.

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32

Pimenov, A., P. Lunkenheimer y A. Loidl. "Broadband dielectric spectroscopy on glycerol and CKN". Ferroelectrics 176, n.º 1 (febrero de 1996): 33–41. http://dx.doi.org/10.1080/00150199608223598.

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33

Axelrod, Ekaterina, Benayahu Urbach, Amir Sa'ar y Yuri Feldman. "Broadband dielectric spectroscopy of oxidized porous silicon". Journal of Physics D: Applied Physics 39, n.º 7 (17 de marzo de 2006): 1326–31. http://dx.doi.org/10.1088/0022-3727/39/7/s06.

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34

Stannarius, R., F. Kremer y M. Arndt. "Dynamic Exchange Effects in Broadband Dielectric Spectroscopy". Physical Review Letters 75, n.º 25 (18 de diciembre de 1995): 4698–701. http://dx.doi.org/10.1103/physrevlett.75.4698.

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35

Macutkevic, Jan, Juras Banys y Yulian Vysochanskii. "Broadband dielectric spectroscopy of CuInP2 Se6 crystals". physica status solidi (a) 206, n.º 1 (15 de diciembre de 2008): 167–72. http://dx.doi.org/10.1002/pssa.200824231.

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36

Pissis, Polycarpos, Daniel Fragiadakis, Athanasios Kanapitsas y Kostas Delides. "Broadband Dielectric Relaxation Spectroscopy in Polymer Nanocomposites". Macromolecular Symposia 265, n.º 1 (mayo de 2008): 12–20. http://dx.doi.org/10.1002/masy.200850502.

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37

Garcia-Bernabé, Abel, Ricardo Díaz-Calleja y Rainer Haag. "Broadband Dielectric Spectroscopy Studies of Hyperbranched Polyglycerols". Macromolecular Chemistry and Physics 207, n.º 11 (2 de junio de 2006): 970–77. http://dx.doi.org/10.1002/macp.200600025.

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38

Neubauer, Nils, René Winkler, Martin Tress, Petra Uhlmann, Martin Reiche, Wycliffe Kiprop Kipnusu y Friedrich Kremer. "Glassy dynamics of poly(2-vinyl-pyridine) brushes with varying grafting density". Soft Matter 11, n.º 15 (2015): 3062–66. http://dx.doi.org/10.1039/c5sm00213c.

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39

Dhotel, Alexandre, Ziguang Chen, Jianing Sun, Boulos Youssef, Jean-Marc Saiter, Andreas Schönhals, Li Tan y Laurent Delbreilh. "From monomers to self-assembled monolayers: the evolution of molecular mobility with structural confinements". Soft Matter 11, n.º 4 (2015): 719–31. http://dx.doi.org/10.1039/c4sm01893a.

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The effect of structural constriction on molecular mobility is investigated by broadband dielectric spectroscopy (BDS) within three types of molecular arrangements: monomers, oligomers and self-assembled monolayers (SAMs).
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40

Sasaki, Toru, Yusuke Hashimoto, Tatsuya Mori y Seiji Kojima. "Broadband Terahertz Time-Domain Spectroscopy of Archaeological Baltic Amber". International Letters of Chemistry, Physics and Astronomy 62 (noviembre de 2015): 29–33. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.62.29.

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We performed the broadband terahertz time-domain spectroscopy on archaeological Baltic amber at 40 million years old. We determined the real and imaginary parts of the complex dielectric constants in the frequency range from 0.2 to 6.5 THz. The imaginary part of the complex dielectric constants showed a broad peak at 1.51 THz and a small peak at 4.0 THz. A boson peak, which is the characteristic low energy excitation of a glassy state, was not observed above 0.2 THz even in low temperatures.
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41

Sasaki, Toru, Yusuke Hashimoto, Tatsuya Mori y Seiji Kojima. "Broadband Terahertz Time-Domain Spectroscopy of Archaeological Baltic Amber". International Letters of Chemistry, Physics and Astronomy 62 (27 de noviembre de 2015): 29–33. http://dx.doi.org/10.56431/p-7120op.

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We performed the broadband terahertz time-domain spectroscopy on archaeological Baltic amber at 40 million years old. We determined the real and imaginary parts of the complex dielectric constants in the frequency range from 0.2 to 6.5 THz. The imaginary part of the complex dielectric constants showed a broad peak at 1.51 THz and a small peak at 4.0 THz. A boson peak, which is the characteristic low energy excitation of a glassy state, was not observed above 0.2 THz even in low temperatures.
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42

Rams-Baron, M., Z. Wojnarowska, A. Jedrzejowska, A. Swiety-Pospiech y M. Paluch. "The implications of various molecular interactions on the dielectric behavior of cimetidine and cimetidine hydrochloride". RSC Advances 6, n.º 114 (2016): 112919–30. http://dx.doi.org/10.1039/c6ra17685b.

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We employed broadband dielectric spectroscopy to characterize the molecular dynamics of cimetidine base and cimetidine hydrochloride, materials with similar structural skeletons but involving different molecular interactions (ionic vs. non-ionic).
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43

Tsurumaki, Akiko, Federico Bertasi, Keti Vezzù, Enrico Negro, Vito Di Noto y Hiroyuki Ohno. "Dielectric relaxations of polyether-based polyurethanes containing ionic liquids as antistatic agents". Physical Chemistry Chemical Physics 18, n.º 4 (2016): 2369–78. http://dx.doi.org/10.1039/c5cp04090f.

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Dielectric properties of polyurethanes containing poly(propylene oxide) (PO) and poly(ethylene oxide) (EO) units are discussed, along with the results of direct current (DC) measurements and broadband electrical spectroscopy (BES) studies.
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44

Brodnikovska, Iryna, Andriy Deriy y Vitaly Petrovsky. "Broadband dielectric response of AlN ceramic composites". Processing and Application of Ceramics 8, n.º 1 (2014): 47–51. http://dx.doi.org/10.2298/pac1401047b.

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Aluminium nitride (AlN) is considered as a substrate material for microelectronic applications. AlN ceramic composites with different amount of TiO2 (up to 4 vol.%) were obtained using hot pressing at different sintering temperature from 1700 to 1900 ?C. It was shown that milling of the raw AlN powder has strongly influence on sintering and improves densification. Broadband dielectric spectroscopy was used as a nondestructive method for monitoring of the ceramic microstructures. TiO2 additive affects the key properties of AlN ceramics. Thus, porosity of 0.1%, dielectric permeability of ? = 9.7 and dielectric loss tangent of tan? = 1.3?10-3 can be achieved if up to 2 vol.% TiO2 is added.
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45

Haspel, Henrik, Ákos Kukovecz, Zoltán Kónya y Imre Kiricsi. "Numerical differentiation methods for the logarithmic derivative technique used in dielectric spectroscopy". Processing and Application of Ceramics 4, n.º 2 (2010): 87–93. http://dx.doi.org/10.2298/pac1002087h.

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In dielectric relaxation spectroscopy the conduction contribution often hampers the evaluation of dielectric spectra, especially in the low-frequency regime. In order to overcome this the logarithmic derivative technique could be used, where the calculation of the logarithmic derivative of the real part of the complex permittivity function is needed. Since broadband dielectric measurement provides discrete permittivity function, numerical differentiation has to be used. Applicability of the Savitzky-Golay convolution method in the derivative analysis is examined, and a detailed investigation of the influential parameters (frequency, spectrum resolution, peak shape) is presented on synthetic dielectric data.
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46

Wrzesińska, Angelika, Aleksandra Wypych-Puszkarz, Izabela Bobowska y Jacek Ulański. "Effects of Counter Anions on AC and DC Electrical Conductivity in Poly(Dimethylsiloxane) Crosslinked by Metal-Ligand Coordination". Polymers 13, n.º 6 (20 de marzo de 2021): 956. http://dx.doi.org/10.3390/polym13060956.

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There is an urgent need for the development of elastic dielectric materials for flexible organic field effect transistors (OFETs). In this work, detailed analysis of the AC and DC electrical conductivity of a series of flexible poly(dimethylsiloxane) (PDMS) polymers crosslinked by metal-ligand coordination in comparison to neat PDMS was performed for the first time by means of broadband dielectric spectroscopy. The ligand was 2,2-bipyridine-4,4-dicarboxylic amide, and Ni2+, Mn2+, and Zn2+ were introduced for Cl−, Br−, and I− salts. Introduction of metal salt and creation of coordination bonds resulted in higher permittivity values increasing in an order: neat PDMS < Ni2+ < Mn2+ < Zn2+; accompanied by conductivity values of the materials increasing in an order: neat PDMS < Cl− < I− < Br−. Conductivity relaxation time plot as a function of temperature, showed Vogel-Fulcher–Tammann dependance for the Br− salts and Arrhenius type for the Cl− and I− salts. Performed study revealed that double-edged challenge can be obtained, i.e., dielectric materials with elevated value of dielectric permittivity without deterioration too much the non-conductive nature of the polymer. This opens up new perspectives for the production of flexible dielectrics suitable for gate insulators in OFETs. Among the synthesized organometallic materials, those with chlorides salts are the most promising for such applications.
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47

Dulski, M., A. Cecotka, S. N. Tripathy, A. Sakalouski, K. Wolnica, M. Tarnacka, R. Wrzalik, K. Kamiński y M. Paluch. "Experimental (FTIR, BDS) and theoretical analysis of mutarotation kinetics of d-fructose mixed with different alcohols in the supercooled region". RSC Advances 6, n.º 62 (2016): 57634–46. http://dx.doi.org/10.1039/c6ra13266a.

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The mutarotation kinetics of pure molten d-fructose and its binary mixture with alcohols (i.e., sorbitol and maltitol) have been reported using Fourier transform infrared, broadband dielectric spectroscopy and density functional theory calculations.
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48

Rams-Baron, Marzena, Agnieszka Jędrzejowska, Mateusz Dulski, Kamila Wolnica, Korbinian Geirhos, Peter Lunkenheimer y Marian Paluch. "Unusual dielectric response of 4-methyl-1,3-dioxolane derivatives". Physical Chemistry Chemical Physics 20, n.º 44 (2018): 28211–22. http://dx.doi.org/10.1039/c8cp05913f.

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In this paper, we applied broadband dielectric spectroscopy (BDS) to investigate the molecular dynamics of three 4-methyl-1,3-dioxolane derivatives (MD) whose chemical structures differ in the length of non-polar alkyl side chains.
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49

Anton, Arthur Markus, Falk Frenzel, Jiayin Yuan, Martin Tress y Friedrich Kremer. "Hydrogen bonding and charge transport in a protic polymerized ionic liquid". Soft Matter 16, n.º 26 (2020): 6091–101. http://dx.doi.org/10.1039/d0sm00337a.

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Hydrogen bonding and charge transport in the protic polymerized ionic liquid PAAPS are studied by combining Fourier transform infrared (FTIR) and broadband dielectric spectroscopy (BDS) in a wide temperature range from 170 to 300 K.
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50

Yildirim, Arda, Paulina Szymoniak, Kathrin Sentker, Martin Butschies, Andrea Bühlmeyer, Patrick Huber, Sabine Laschat y Andreas Schönhals. "Dynamics and ionic conductivity of ionic liquid crystals forming a hexagonal columnar mesophase". Physical Chemistry Chemical Physics 20, n.º 8 (2018): 5626–35. http://dx.doi.org/10.1039/c7cp08186c.

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For the first time, the molecular mobility of two linear-shaped tetramethylated guanidinium triflate ionic liquid crystals (ILCs) having different lengths of alkyl chains was investigated using a combination of broadband dielectric (BDS) and specific heat spectroscopy (SHS).
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