Membrane characteristics of composite collodion membrane III. Effect of added NaClO4 on transport phenomena

Yamauchi, Akira; Shinozaki, Michiya; Shin, Yuka; Kawabe, Masato

doi:10.1016/s0376-7388(99)00167-2

Cited by 23 publications

(8 citation statements)

References 11 publications

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“…One important variable is likely that the partition coefficient of the phosphate ion and each polymer would be expected to be different. 27,28 This could affect the initial sorption of the ion into the polymer and ultimately affect the rate of release from the microcapsule. Once inside the microcapsule, the ability of the membrane to have specific interactions with the ion would also play a role on the rate of diffusion through the membrane.…”

Section: Discussionmentioning

confidence: 99%

Ion permeable microcapsules for the release of biologically available ions for remineralization

Davidson

Greving

McHale

et al. 2011

J Biomedical Materials Res

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The objective of this study was to investigate the effect of chemical structure, ion concentration, and ion type on the release rate of biologically available ions useful for remineralization from microcapsules with ion permeable membranes. A heterogeneous polymerization technique was utilized to prepare microcapsules containing either an aqueous solution of K₂HPO₄, Ca(NO₃)₂, or NaF. Six different polyurethane-based microcapsule shells were prepared and characterized based on ethylene glycol, butanediol, hexanediol, octanediol, triethylene glycol, and bisphenol A structural units. Ion release profiles were measured as a function of initial ion concentration within the microcapsule, ion type, and microcapsule chemical structure. The rate of ion release increased with initial concentration of ion stored in the microcapsule over a range of 0.5-3.0M. The monomer used in the synthesis of the membrane had a significant effect on ion release rates at 3.0 M salt concentration. At 1.0 M, the ethylene glycol released ions significantly faster than the hexanediol-, octanediol-, and butanediol-based microcapsules. Ion release was fastest for fluoride and slowest for phosphate for the salts used in this study. It was concluded that the microcapsules are capable of releasing calcium, phosphate, and fluoride ions in their biologically available form.

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Section: Discussionmentioning

confidence: 99%

Ion permeable microcapsules for the release of biologically available ions for remineralization

Davidson

Greving

McHale

et al. 2011

J Biomedical Materials Res

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“…The differences seen in the release rates from microcapsules synthesized from 1,6‐hexanediol, 1,8‐octanediol, bisphenol A, and 1,4‐butanediol could be explained as a competition of factors. One important variable is likely that the partition coefficient of the phosphate ion and each polymer would be expected to be different 27, 28. This could affect the initial sorption of the ion into the polymer and ultimately affect the rate of release from the microcapsule.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of 2‐(9H‐carbazole‐9‐yl)ethyl methacrylate: Electrochemical impedance spectroscopic study of poly(2‐(9H‐carbazole‐9‐yl)ethyl methacrylate) on carbon fiber

Ateş

Uludag

Sarac

2011

J of Applied Polymer Sci

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In this contribution, 2‐(9H‐carbazol‐9‐yl) ethyl methacrylate (CzEMA) monomer was chemically synthesized. The monomer characterization was performed by FT‐IR, 1H‐NMR, 13C‐NMR, and melting point analysis. The electropolymerization of CzEMA was studied onto carbon fiber microelectrodes (CFMEs) as an active electrode material in 0.1M sodium perchlorate (NaClO4)/acetonitrile (ACN) solution. The electropolymerization experiments were done from 1 mM to 10 mM. The detailed characterization of the resulting electrocoated Poly (CzEMA)/CFME thin films was studied by various techniques, i.e., cyclic voltammetry (CV), Scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The effects of initial monomer concentrations (1, 3, 5, and 10 mM) during the preparation of modified electrodes were examined by EIS. Capacitive behaviors of modified CFMEs were defined via Nyquist, Bode‐magnitude, and Bode‐phase plots. Variation of capacitance values by initial monomer concentration and specific capacitance values are presented. The highest specific capacitance value electrocoated polymer thin film by CV method in the initial monomer concentration of 5 mM with a charge of 52.74 mC was obtained about 424.1 μF cm−2. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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“…The volume change and salt concentration change were measured as functions of time by using graduated glass capillary and pencil‐type conductance electrode, in cell 1 or cell 2, respectively. Volume flux and solute flux were estimated from volume change versus time and concentration change versus time by taking account of membrane area, respectively 11–14. In this study, the volume flux and solute flux were examined in two different situations, system I and system II, separately.…”

Section: Methodsmentioning

confidence: 99%

Material transport properties of polymer–gel composite‐charged mosaic membrane with and without reinforcement [II]

Hirao

Yamauchi

Sayed

2006

J of Applied Polymer Sci

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ABSTRACT:The charged mosaic membranes (CMM) without reinforcement and the composite charged mosaic membrane (CCMM) with reinforcement were investigated in terms of solute and solvent transport. The composite charged mosaic membrane (CCMM) with reinforcement showed an unique transport behavior such as preferential material transport L p and . Filtration coefficient, L p and salt permeability coefficient were estimated by taking account of active layer thickness of composite polymer gel. The L p and values of CCMM with reinforcement were larger than those of charged mosaic membrane (CMM) without reinforcement. On the other hand, the reflection coefficient of CCMM showed negative value, which suggested the preferential material transport to solvent transport. This indicates that was independent of active layer thickness. Furthermore, the results of transport properties of CCMM with reinforcement were supported by the membrane potential measurements

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Membrane characteristics of composite collodion membrane III. Effect of added NaClO4 on transport phenomena

Cited by 23 publications

References 11 publications

Ion permeable microcapsules for the release of biologically available ions for remineralization

Ion permeable microcapsules for the release of biologically available ions for remineralization

Synthesis of 2‐(9H‐carbazole‐9‐yl)ethyl methacrylate: Electrochemical impedance spectroscopic study of poly(2‐(9H‐carbazole‐9‐yl)ethyl methacrylate) on carbon fiber

Material transport properties of polymer–gel composite‐charged mosaic membrane with and without reinforcement [II]

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