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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

Filling of the membrane pores during the first (a) and further (b) stages of modification. The nanoparticles inside the polymer macropores block them and form secondary porosity.
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Fig11: Filling of the membrane pores during the first (a) and further (b) stages of modification. The nanoparticles inside the polymer macropores block them and form secondary porosity.

Mentions: Thus, a mechanism of filling of the polymer matrix with pores, which are smaller than 1 μm, is similar to those for ceramics (r > 1 μm). Matrix pores are blocked with aggregates of ZHP nanoparticles during the first synthesis stage (Figure 11). The aggregates evidently give pores, a radius of which is about 4 nm (see Figure 4). The aggregates isolate wide cavities, which are partially seen in the differential pore size distributions. During further modification stages, only nanosized particles of sol are able to penetrate inside matrix pores. Pores between the aggregates are gradually blocked with ZHP nanoparticles, making full filling of macropores of the polymer impossible. Since the modifier occupies about 30% of the total pore volume, its maximal thickness is ≈ 3 μm (assuming that all the modifier form ‘corks’).Figure 11


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)

Filling of the membrane pores during the first (a) and further (b) stages of modification. The nanoparticles inside the polymer macropores block them and form secondary porosity.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig11: Filling of the membrane pores during the first (a) and further (b) stages of modification. The nanoparticles inside the polymer macropores block them and form secondary porosity.
Mentions: Thus, a mechanism of filling of the polymer matrix with pores, which are smaller than 1 μm, is similar to those for ceramics (r > 1 μm). Matrix pores are blocked with aggregates of ZHP nanoparticles during the first synthesis stage (Figure 11). The aggregates evidently give pores, a radius of which is about 4 nm (see Figure 4). The aggregates isolate wide cavities, which are partially seen in the differential pore size distributions. During further modification stages, only nanosized particles of sol are able to penetrate inside matrix pores. Pores between the aggregates are gradually blocked with ZHP nanoparticles, making full filling of macropores of the polymer impossible. Since the modifier occupies about 30% of the total pore volume, its maximal thickness is ≈ 3 μm (assuming that all the modifier form ‘corks’).Figure 11

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