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Organic-inorganic materials containing nanoparticles of zirconium hydrophosphate for baromembrane separation.

Dzyazko YS, Rozhdestvenskaya LM, Zmievskii YG, Vilenskii AI, Myronchuk VG, Kornienko LV, Vasilyuk SV, Tsyba NN - Nanoscale Res Lett (2015)

Bottom Line: The nanoparticles (4 to 10 nm) were found to form aggregates, which block pores of the polymer.Pores between the aggregates (4 to 8 nm) as well as considerable surface charge density provide significant transport numbers of counter ions (up to 0.86 for Na(+)).It was found that precipitate is formed mainly inside the pores of the pristine membrane.

View Article: PubMed Central - PubMed

Affiliation: Department of Sorption and Membrane Materials and Processes, V.I. Vernadskii Institute of General and Inorganic Chemistry, NASU, Palladin Pr. 32/34, 03142 Kiev, Ukraine.

ABSTRACT
Organic-inorganic membranes were obtained by stepwise modification of poly(ethyleneterephthalate) track membrane with nanoparticles of zirconium hydrophosphate. The modifier was inserted inside pores of the polymer, a size of which is 0.33 μm. Inner active layer was formed by this manner. Evolution of morphology and functional properties of the membranes were investigated using methods of porosimetry, potentiometry and electron microscopy. The nanoparticles (4 to 10 nm) were found to form aggregates, which block pores of the polymer. Pores between the aggregates (4 to 8 nm) as well as considerable surface charge density provide significant transport numbers of counter ions (up to 0.86 for Na(+)). The materials were applied to baromembrane separation of corn distillery. It was found that precipitate is formed mainly inside the pores of the pristine membrane. In the case of the organic-inorganic material, the deposition occurs onto the outer surface and can be removed by mechanical way. Location of the active layer inside membranes protects it against damage.

No MeSH data available.


Related in: MedlinePlus

Transport number of counter-ions as a function of.
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Fig9: Transport number of counter-ions as a function of.

Mentions: In the last case, the transport number of counter-ions () through the membrane was determined from the data of membrane potential (Em) according to the formula for 1,1 binary electrolyte [31]:4\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {E}_m=\frac{RT}{F}\left[ \ln \frac{a_2}{a_1}\pm 2{\displaystyle \underset{a_1}{\overset{a_2}{\int }}\left(1-\overline{t}\right)d \ln {a}_{\pm }}\right] $$\end{document}Em=RTFlna2a1±2∫a1a21−t¯dlna±where a1 and a2 are the activities of counter-ions in less and more concentrated solutions, respectively, a± is the activity of the solution of varied concentration (more concentrated solution in our case), R is the gas constant, F is the Faraday constant and T is the temperature. The transport numbers of Na+ ions are represented in Figure 9, they are sensitive to the solution concentration and approximated to the ‘true’ value with a decrease of a difference of the solution concentration [30]. This value is evidently realized under applied potential.Figure 9


Organic-inorganic materials containing nanoparticles of zirconium hydrophosphate for baromembrane separation.

Dzyazko YS, Rozhdestvenskaya LM, Zmievskii YG, Vilenskii AI, Myronchuk VG, Kornienko LV, Vasilyuk SV, Tsyba NN - Nanoscale Res Lett (2015)

Transport number of counter-ions as a function of.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385033&req=5

Fig9: Transport number of counter-ions as a function of.
Mentions: In the last case, the transport number of counter-ions () through the membrane was determined from the data of membrane potential (Em) according to the formula for 1,1 binary electrolyte [31]:4\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {E}_m=\frac{RT}{F}\left[ \ln \frac{a_2}{a_1}\pm 2{\displaystyle \underset{a_1}{\overset{a_2}{\int }}\left(1-\overline{t}\right)d \ln {a}_{\pm }}\right] $$\end{document}Em=RTFlna2a1±2∫a1a21−t¯dlna±where a1 and a2 are the activities of counter-ions in less and more concentrated solutions, respectively, a± is the activity of the solution of varied concentration (more concentrated solution in our case), R is the gas constant, F is the Faraday constant and T is the temperature. The transport numbers of Na+ ions are represented in Figure 9, they are sensitive to the solution concentration and approximated to the ‘true’ value with a decrease of a difference of the solution concentration [30]. This value is evidently realized under applied potential.Figure 9

Bottom Line: The nanoparticles (4 to 10 nm) were found to form aggregates, which block pores of the polymer.Pores between the aggregates (4 to 8 nm) as well as considerable surface charge density provide significant transport numbers of counter ions (up to 0.86 for Na(+)).It was found that precipitate is formed mainly inside the pores of the pristine membrane.

View Article: PubMed Central - PubMed

Affiliation: Department of Sorption and Membrane Materials and Processes, V.I. Vernadskii Institute of General and Inorganic Chemistry, NASU, Palladin Pr. 32/34, 03142 Kiev, Ukraine.

ABSTRACT
Organic-inorganic membranes were obtained by stepwise modification of poly(ethyleneterephthalate) track membrane with nanoparticles of zirconium hydrophosphate. The modifier was inserted inside pores of the polymer, a size of which is 0.33 μm. Inner active layer was formed by this manner. Evolution of morphology and functional properties of the membranes were investigated using methods of porosimetry, potentiometry and electron microscopy. The nanoparticles (4 to 10 nm) were found to form aggregates, which block pores of the polymer. Pores between the aggregates (4 to 8 nm) as well as considerable surface charge density provide significant transport numbers of counter ions (up to 0.86 for Na(+)). The materials were applied to baromembrane separation of corn distillery. It was found that precipitate is formed mainly inside the pores of the pristine membrane. In the case of the organic-inorganic material, the deposition occurs onto the outer surface and can be removed by mechanical way. Location of the active layer inside membranes protects it against damage.

No MeSH data available.


Related in: MedlinePlus