Dielectric analysis of aqueous poly(l-glutamic acid) and poly-l-(glutamic acid4, Tyrosine1) solutions at high frequencies from capacitance measurements

Tóm tắt

A new parallel-plate capacitor fixture has been designed and successfully used to measure dielectric loss of polyelectrolyte solutions with volumes as low as droplets of 13–26 μL. It is particularly useful when studying polypeptides that are either high-cost or can be synthesized only in limited quantities. The ease with which the fixture can be used to obtain preliminary dielectric loss data yields savings in time and cost. In this study capacitance measurements were performed in a wide range of frequencies between 1 and 800 MHz using an Agilent 4191RF Impedance Analyzer. Accuracy of measurements was carefully examined through a comparison of measured conductivity of 1M NaCl against Stogryn's equation for conductivity. A 0.3% difference between the experimentally measured and theoretically calculated results has been found, demonstrating the validity of the proposed analysis method.

Từ khoá

Dielectric relaxation; Dielectric loss; Permittivity; High frequency; Impedance analyzer

Tài liệu tham khảo

[1] U. Kaatze, Y. Feldman, Broadband dielectric spectrometry of liquids and biosystems, Meas. Sci. Technol. 17 (2006) R17eR35.
[2] S. Takashima, A. Casaleggio, F. Giuliano, M. Morando, P. Arrigo, S. Ridella, Study of bound water of poly-adenine using high frequency dielectric measurements, Biophys. J. 49 (1986) 1003e1008.
[3] J. Bobowski, T. Johnson, Permittivity measurements of biological samples by an open-ended coaxial line, Prog. Electromagn. Res. B 40 (2012) 159e183.
[4] N. Sheen, I. Woodhead, An open-ended coaxial probe for broad-band permittivity measurement of agricultural products, J. Agric. Eng. Res. 74 (1999) 193e202.
[5] D.M. Hagl, D. Popovic, S.C. Hagness, J.H. Booske, M. Okoniewski, Sensing volume of open-ended coaxial probes for dielectric characterization of breast tissue at microwave frequencies, IEEE Trans. Microw. Theory Tech. 51 (4) (2003) 1194e1206.
[6] S. Mashimo, T. Ota, N. Shinyashiki, S. Tanaka, S. Yagihawa, Dielectric study on chain dynamics of poly(g1utamic acid) in aqueous solution using the frequency range 107 e1010 hz, Macromolecules 22 (1989) 1285e1288.
[7] F. Bordi, C. Cametti, G. Paradossi, Side-chain dynamics in poly(a-glutamate) and poly(g-glutamate) aqueous solutions: a high-frequency dielectric investigation, Phys. Chem. Chem. Phys. 1 (1999) 1555e1561.
[8] G.D.J. Phillies, Phenomenology of Polymer Solution Dynamics, Cambridge University Press, Cambridge, UK, 2011.
[9] O. Thiabgoh, H. Shen, T. Eggers, A. Galati, S. Jiang, J. Liu, Z. Li, J. Sun, H. Srikanth, M. Phan, Enhanced high frequency magneto impedance response of melt extracted Co69.25 Fe4.25 Si13B13.5 microwires subject to joule annealing, J. Sci. Adv. Mater. Dev. 1 (2016) 69e74.
[10] A. Zhukov, A. Talaat, M. Ipatov, A. Granovsky, V. Zhukova, Estimation of the frequency and magnetic field dependence of the skin depth in co rich magnetic microwires from gmi experiments, J. Sci. Adv. Mater. Dev. 1 (2016) 388e392.
[11] D. de Cos, A. Garcia-Arribas, J. Barandiaran, Analysis of magnetoimpedance measurements at high frequency using a microstrip transmission line, Sens. Actuators A 115 (2004) 368e375.
[12] F. Bordi, C. Cametti, R. Colby, Dielectric spectroscopy and conductivity of polyelectrolyte solutions, J. Phys. Condens. Matter 16 (2004) R1423eR1463.
[13] E. Riande, E. Saiz, Dipole Moments and Birefringence of Polymers, Prentice Hall, Englewood Cliffs, New Jersey, 1992.
[14] G. Strobl, The Physics of Polymers: Concepts for Understanding Their Structures and Behavior, Springer-Verlag, Berlin Heidelberg, 2007.
[15] J.P. Runt, J.J. Fitzgerald, Dieletric Spectroscopy of Polymeric Materials: Fundamentals and Applications, American Chemical Society, Washington, DC, 1997.
[16] A. Technologies, 4191a rf Impedance Analyzer Operation and Service manual, Agilent Manual (04191-90012), 1981, pp. 1e418.
[17] W.J.K. Raymond, C.K. Chakrabarty, G.C. Hock, A.B. Ghani, Complex permittivity measurement using capacitance method from 300 khz to 50 mhz, Measurement 46 (2013) 3796e3801.
[18] A. Technologies, Agilent Technologies Impedance Measurement Handbook, Handbook, 2006, 4e1e4e22.
[19] V. Komarov, S. Wang, J. Tang, Encyclopedia of RF and Microwave Engineering, John Wiley & Sons, Inc, 2005.
[20] A. Stogryn, Equations for calculating the dielectric constant of saline water, IEEE Trans. Microw. Theory Tech. 19 (8) (1971) 733e736.
[21] S. Mashimo, Dieletric Spectroscopy of Polymeric Materials: Fundamentals and Applications, in: J.P. Runt, J.J. Fitzgerald (Eds.), American Chemical Society, Washington, DC, 1997.
[22] F. Bordi, C. Cametti, G. Paradossi, Chain dynamics in poly(l-glutamic acid) aqueous solutions as observed by means of frequency domain dielectric spectroscopy, Macromolecules 25 (1992) 4206e4209.
[23] F. Bordi, C. Cametti, A. Motta, Scaling behavior of the high-frequency dielectric properties of poly-l-lysine aqueous solutions, Macromolecules 33 (2000) 1910e1916.