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  • 1
    Electronic Resource
    Electronic Resource
    Dielectric study of poly(methyl methacrylate) microcapsules in particular reference to the effect of the frequency dependence of the permittivity of the capsule wall (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 943-950 
    Details
    ISSN: 1435-1536
    Keywords: Dielectric property ; interfacial polarization ; microcapsule ; poly(methylmethacrylate) ; polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dielectric behavior of poly(methyl methacrylate) (PMMA) microcapsules was analyzed theoretically by taking account of the frequency dependence of the relative permittivityɛ s and the electrical conductivityχ s of the capsule wall. For comparison, similar analysis was applied to polystyrene (PS) microcapsules which have frequency-independentɛ s andχ s . The behavior ofɛ s andχ s of the PMMA microcapsules was assumed to be represented by a dielectric relaxation of them-th power type on the basis of dielectric data on underwater PMMA films. By means of a theory of the interfacial polarization, some consideration was carried out regarding the effect of the frequency dependence ofɛ s andχ s on the dielectric behavior of the PMMA microcapsules. The consideration led to predictions that the frequency dependence ofɛ s andχ s causes (i) the variation in the relaxation intensity with the change in the conductivity of suspending medium, (ii) the frequency dependence of the permittivity at low frequencies and (iii) the frequency dependence of the conductivity at high frequencies. The theoretical prediction (i) was verified by observed data, (ii) and (iii) remaining unverified owing to the experimental difficulty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410859
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of dielectric observations of KCl-charged poly(methyl methacrylate) microcapsules using a two-component model consisting of KCl-permeable and KCl-impermeable capsules (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 1054-1060 
    Details
    ISSN: 1435-1536
    Keywords: Dielectric properties ; microcapsule ; permeability ; poly(methyl methacrylate)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Dielectric measurements were carried out on aqueous suspensions of poly(methyl methacrylate) microcapsules charged with KCl solutions to examine the KCl permeability of the microcapsules. The specimens exhibited three kinds of dielectric relaxation. Two kinds of dielectric relaxation were observed immediately after washing the specimens with distilled water. These overlapped each other when the specimen was left standing in the measuring cell for a long time. Their relaxation frequencies were affected by the KCl concentration of the suspending medium in which the specimen was kept before washing. Another relaxation was observed distinctly when the spepcimens were washed thoroughly with distilled water. Its relaxation frequency was affected by the KCl concentration of the charged solution. These results were explained by assuming that the specimens were mixtures of KCl-permeable and KCl-impermeable capsules. The theoretical analysis procedure was devised in the light of dielectric theory of interfacial polarization to estimate the parameters which characterize the structure of the specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417462
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  • 3
    Electronic Resource
    Electronic Resource
    Theoretical study of dielectric behavior of microcapsule suspensions with distributed drug release rate (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 1059-1065 
    Details
    ISSN: 1435-1536
    Keywords: Dielectricproperty ; distribution ; microcapsule ; suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Theoretical consideration is made concerning the dielectric behavior of aqueous suspensions of W/O-type microcapsules containing aqueous electrolyte solutions, especially concerning distribution effects of the electrolyte release rate on the dielectric behavior. It is shown at first that the distribution of the release rate causes electrical conductivity of the capsule interior. Next, it is deduced, in the light of a theory of the interfacial polarization, that the distribution characteristics of the capsule interior's electrical conductivity are closely related to those of the relaxation time for a dielectric relaxation exhibited by the suspensions. Several formulas are derived to describe the relation between the distribution characteristics of the release rate and those of the relaxation time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410595
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  • 4
    Electronic Resource
    Electronic Resource
    Dielectric analysis of PMMA microcapsules containing an aqueous KCl solution to derive a distribution function of the release rate of KCl (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 880-888 
    Details
    ISSN: 1435-1536
    Keywords: Dielectricrelaxation ; distribution ; microcapsule ; permeability ; porassiumchloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Release of KCl from a batch of PMMA microcapsules containing an aqueous 3 mM KCl solution was studied with the following two methods: 1) dielectric measurements of suspensions of the microcapsules in distilled water. The electrical conductivity of capsule interior was estimated with this method. 2) Measurements of the conductivity of suspending medium of the microcapsule suspensions. These two kinds of experiments provided us with information about the amount of KCl remaining in the capsules and that diffused outside. Results of these experiments showed that the microcapsules varied in their release rate of KCl. A distribution function of the release rates was derived from the results of the dielectric measurements. That distribution function was successful in explaining the results of the measurements of the conductivity of suspending medium. Furrther examination revealed that the release rate increased with the increase in the thickness of capsule wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657304
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  • 5
    Electronic Resource
    Electronic Resource
    Dielectric approach to polystyrene microcapsule analysis and the application to the capsule permeability to potassium chloride (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 513-520 
    Details
    ISSN: 1435-1536
    Keywords: Dielectric property ; dielectric relaxation ; microcapsule ; permittivity ; polystyrene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method of numerical analysis is proposed to determine the phase parameters from dielectric observations of polystyrene microcapsules by using the conductivity at intermediate frequencies between two dielectric relaxations observed. The method was more feasible for the analysis of the microcapsule observations than the method by which the calculation is performed by use of the permittivity at lower frequencies. The method was applied to the dielectric observations of the KCl-loaded microcapsules to obtain the permittivity and the conductivity of the capsule interior, the thickness of the capsule wall, the volume fraction of the suspended capsules and the conductivity of the surrounding aqueous phase. The conductivity of capsule interior was found to be unchanged with time for as long as 3 months. From the results it is concluded that the microcapsules are impermeable to KCl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01451514
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  • 6
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    Pressure suppression of unconventional charge-density-wave state in PrRu_{4}P_{12} studied by optical conductivity (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-05-10
    Description: Author(s): H. Okamura, N. Ohta, A. Takigawa, I. Matsutori, K. Shoji, K. Miyata, M. Matsunami, T. Nanba, H. Sugawara, C. Sekine, I. Shirotani, H. Sato, T. Moriwaki, Y. Ikemoto, Z. Liu, and G. L. Carr Optical conductivity [ σ ( ω ) ] of PrRu 4 P 12 has been studied under high pressure to 14 GPa, at low temperatures to 8 K, and at photon energies 12 meV–1.1 eV. The energy gap in σ ( ω ) at ambient pressure, caused by a metal-insulator transition due to an unconventional charge-density-wave formation at 63 K,... [Phys. Rev. B 85, 205116] Published Wed May 09, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Stability of multinode Dirac semimetals against strong long-range correlations (2014)
    American Physical Society (APS)
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    Publication Date: 2014-08-22
    Description: Author(s): Akihiko Sekine and Kentaro Nomura We study the stability of Dirac semimetals with N nodes in three spatial dimensions against strong 1/r long-range Coulomb interactions. We particularly study the cases of N=4 and N=16, where the N=4 Dirac semimetal is described by the staggered fermions and the N=16 Dirac semimetal is described by t... [Phys. Rev. B 90, 075137] Published Thu Aug 21, 2014
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Ferromagnetic spin fluctuations in the filled skutterudite ${\mathrm{SrFe}}_{4}{\mathrm{As}}_{12}$ revealed by $^{75}\mathrm{As}$ NMR-NQR measurements (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-11-01
    Description: Author(s): Q.-P. Ding, K. Rana, K. Nishine, Y. Kawamura, J. Hayashi, C. Sekine, and Y. Furukawa As 75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements have been carried out to investigate the magnetic and electronic properties of the filled skutterudite metallic compound SrFe 4 As 12 . The temperature dependence of Knight shift K determined by the NQR spectrum un... [Phys. Rev. B 98, 155149] Published Wed Oct 31, 2018
    Keywords: Electronic structure and strongly correlated systems
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    Topics: Physics
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  • 9
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    Strong coupling expansion in a correlated three-dimensional topological insulator (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-01
    Description: Author(s): Akihiko Sekine, Takashi Z. Nakano, Yasufumi Araki, and Kentaro Nomura Motivated by recent studies which show that topological phases may emerge in strongly correlated electron systems, we theoretically study the strong electron correlation effect in a three-dimensional topological insulator, where the effective Hamiltonian can be described by the Wilson fermions. We a... [Phys. Rev. B 87, 165142] Published Tue Apr 30, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Charge fractionalization in artificial Tomonaga-Luttinger liquids with controlled interaction strength (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-08-12
    Description: Author(s): Paul Brasseur, Ngoc Han Tu, Yoshiaki Sekine, Koji Muraki, Masayuki Hashisaka, Toshimasa Fujisawa, and Norio Kumada We investigate charge fractionalizations in artificial Tomonaga-Luttinger liquids (TLLs) composed of two capacitively coupled quantum Hall edge channels (ECs) in graphene. The interaction strength of the artificial TLLs can be controlled through distance W between the ECs. We show that the fractiona... [Phys. Rev. B 96, 081101(R)] Published Tue Aug 08, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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