Studies with Composite Membranes

Lakshminarayanaiah, N.; Siddiqi, F.

doi:10.1016/s0006-3495(71)86239-2

Cited by 27 publications

(11 citation statements)

References 19 publications

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“…The impedance of the circuit given in Fig-2 However, another equivalent electrical circuit has been used to represent the complex membranes in view of uncontrolled simultaneous deposition of Iron phosphate and cupric phosphate in the interstices of parchment paper 14 as shown in (9) and (10) The values of R e and X e determined from Eq-6 and7 or Eq-9 and 10 equilibrating the membranes with different concentrations of various electrolytes at 1KHz oscillator frequency are given in Table-5. These values are comparable to the observed values of RX and XX of the both complex membrane particularly at higher concentrations of bathing electrolyte as given in Table-6.…”

Section: Resultsmentioning

confidence: 99%

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Electrical Double Layer Capacitance And Impedance Characteristics of Inorganic Precipitate Membranes

Jadon¹

2017

juc

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To understand the mechanism of ionic diffusion through membranes the membrane resistance, capacitance and impedance of parchment supported Iron phosphate, cupric phosphate and complex ironcupric phosphate membranes have been analyzed. The electrical resistance (R x ), and capacitance(C x ) developed across these membranes have been measured at different electrolyte concentrations and oscillator frequencies.The obtained the values of membrane resistance(R m ), membrane capacitance(C m ), impedance(Z) were found to dependent on the concentration of the electrolyte and on the applied oscillator frequency at isothermal temperature (25±0.1°C). The electrical double-layer at the membrane-electrolyte interface was influenced and controlled by the transport of ions. An increase in concentration of electrolyte solution causes the counter ions in the form of double-layer inside the membranes makes membrane more conductive. Different model-equivalent electrical circuits against to membranes have been analyzed using the experimental data. There is a deviation from theoretical predictions in Membrane resistance, capacitance and impedance due to roughness and non homogeneity of the membranes used in present investigation.

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Section: Resultsmentioning

confidence: 99%

“…The geometric capacitor is placed between the two interfacial double layer capacitors as suggested by Armstrong 19 . For higher electrolyte concentrations and/or significant surface charge 20,21 .…”

Section: Resultsmentioning

confidence: 99%

Electrical Double Layer Capacitance And Impedance Characteristics of Inorganic Precipitate Membranes

Jadon¹

2017

juc

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“…The impedance of the proposed equivalent electrical circuit (Fig. 4) for the membrane/electrolyte system is given by Equation (14) can be approximated a t higher oscillator frequencies as 19) where u p is the polarization charge on the capacitor. Equation (16) the values of C, calculated from eqs.…”

Section: Resultsmentioning

confidence: 99%

“…If us = 0, then24 where c 0 = 8.85 X 10-14F/Cm, is the dielectric coefficient of water, a is a constant which takes into account the structural details of membrane polymer, and (1,'~) is the Debye-Huckle length given by K where p is the ionic strength of bathing electrolyte solution. a is determined from the transcendental equation or alternatively from C,V, = u p = 4 F c ( l /~) sinh a(19)…”

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confidence: 99%

Impedance characteristics of parchment supported inorganic precipitate membranes

Beg

Altaf

1990

J of Applied Polymer Sci

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SynopsisThe impedance characteristics of parchment-supported inorganic precipitate model membranes have been analyzed in order to understand the mechanism of ionic diffusion through biomembrans. The observed values of membrane capacitance and resistance were found to be dependent on the concentration of bathing electrolyte and applied oscillator frequency. The change in membrane capacitance and resistance values with the change in electrolyte concentration and oscillator frequency has been interpreted in terms of changes produced in the electrical double layer at the membrane-solution interface. The values of interfacial double layer capacitance derived by the equations of Armstrong and Longer were found to be different due to the presence of polarising charge and other structural details of membrane matrix. Different model-equivalent electrical circuits have been analyzed using the experimental data. The complex impedance spectra have been found to deviate from the theoretical predictions at low frequencies due to nonhomogenous and rough surface of the membrane.

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“…(1-3) generated the first bimolecular lipid layer membrane which has been used as a model by a number of investigators. Recently other complex membranes have been prepared by Liquori et al (4)(5)(6), Hays (7), De Korosy (8), Lakshminarayanaiah and Siddiqi (9)(10)(11), Siddiqi et al (12), Beg and coworkers (14)(15)(16)(17)(18), and utilized as a useful representation of living systems.…”

Section: Introductionmentioning

confidence: 99%

Preparation of cupric palmitate membrane, its characterization and evaluation of thermodynamically effective fixed charge density

Beg

Siddiqi

Husain

et al. 1979

Lipids

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Membrane potentials have been measured across parchment-supported cupric palmitate membrane separating various 1:1 electrolytes at concentrations C1 and C2 such that C2 = 10 C1. Membrane potential data have been used to calculate transference number of ions, permselectivity and also to derive the thermodynamically effective fixed charge density which is an important characteristic governing the membrane phenomena by utilizing the generally accepted and most widely used theory of Teorell-Meyer and Sievers as well as the recent theories for membrane potential of Kobatake et al. and Nagasawa et al. based on the principles of nonequilibrium thermodynamics. The values of charge densities derived from different theories were almost the same, confirming thereby the validity of the recently developed theories of membrane potential.

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Studies with Composite Membranes

Cited by 27 publications

References 19 publications

Electrical Double Layer Capacitance And Impedance Characteristics of Inorganic Precipitate Membranes

Electrical Double Layer Capacitance And Impedance Characteristics of Inorganic Precipitate Membranes

Impedance characteristics of parchment supported inorganic precipitate membranes

Preparation of cupric palmitate membrane, its characterization and evaluation of thermodynamically effective fixed charge density

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