Poly(vinyl alcohol)-iron oxide nanocomposite membranes for pervaporation dehydration of isopropanol, 1,4-dioxane and tetrahydrofuran

Sairam, M.; Naidu, B. Vijaya Kumar; Nataraj, Sanna Kotrappanavar; Sreedhar, B.; Aminabhavi, Tejraj M.

doi:10.1016/j.memsci.2006.06.013

Cited by 93 publications

(37 citation statements)

References 18 publications

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“…PVA is frequently reported as a coating material for magnetic NPs because of its hydrophilicity, biocompatibility, excellent film or gel forming capability (via chemical or physical crosslinking), and adhesive properties [149][150][151]. Additionally, applying an appropriate amount of PVA as a coating on SPIONs prevents their aggregation mostly via steric hindrance mechanism and gives rise to mono-dispersed NPs [40,117,[152][153][154][155][156][157]. Nevertheless, a high amount of PVA, usually polymer/iron mass ratio (r) greater that 3, causes the formation of magnetic beads, reduces the crystallinity of SPIONs, and affects the cytotoxicity profile of the obtained materials due to the effect of crystallinity on the protein adsorption profile on the particles surfaces [39,[157][158][159].…”

Section: Polyvinyl Alcoholmentioning

confidence: 99%

Recent advances in surface engineering of superparamagnetic iron oxide nanoparticles for biomedical applications

Mahmoudi

Simchi

Imani

2010

JICS

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Superparamagnetic iron oxide nanoparticles (SPIONs) are promising materials for various biomedical applications including targeted drug delivery and imaging, hyperthermia, magneto-transfections, gene therapy, stem cell tracking, molecular/cellular tracking, magnetic separation technologies (e.g. rapid DNA sequencing), and detection of liver and lymph node metastases. The most recent applications for SPIONs for early detection of inflammatory, cancer, diabetes and atherosclerosis have also increased their popularity in academia. In order to increase the efficacy of SPIONs in the desired applications, especial surface coating/characteristics are required. The aim of this article is to review the surface properties of magnetic nanoparticles upon synthesis and the surface engineering by different coatings. The biological aspects, cytotoxicity, and health risks are addressed. Special emphasis is given to organic and inorganic-based coatings due to their determinant role in biocompatibility or toxicity of the final particles.

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Section: Polyvinyl Alcoholmentioning

confidence: 99%

Recent advances in surface engineering of superparamagnetic iron oxide nanoparticles for biomedical applications

Mahmoudi

Simchi

Imani

2010

JICS

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“…4 DMTA is a current technique in thermal studies, and exact quantities of T g values can be obtained from this technique. 25,26 The DMTA results of the prepared membranes were studied in term of modulus as a function of temperature. The modulus curves and also T g values of the prepared membranes are presented in Figures 5 and 6, respectively.…”

Section: Thermal Stability Of the Prepared Membranesmentioning

confidence: 99%

Effect of poly(vinyl pyrrolidone) concentration and coagulation bath temperature on the morphology, permeability, and thermal stability of asymmetric cellulose acetate membranes

Saljoughi

Amirilargani

Mohammadi

2008

J of Applied Polymer Sci

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Cellulose acetate (CA) is widely used in membrane processes. In this study, CA (weight-average molecular weight ¼ 52,000) was mixed with poly(vinyl pyrrolidone) (PVP; weight-average molecular weight ¼ 15,000) as an additive in 1-methyl-2-pyrrolidone as a solvent. The phase-inversion method was used for the preparation of flat-sheet membranes. The effects of PVP concentration and coagulation bath temperature (CBT) on the morphology, pure water permeation flux, and thermal stability of the prepared membranes were studied and are discussed in this article. The solute rejection of the developed CA membranes was quantified with an insulin protein solution. The results showed that an increase in the CBT levels from 0 to 23C along with an increase in the PVP concentration in the cast film from 0 to 1.5 wt % resulted in an increase in the macrovoid formation in the membrane sublayer, an increase in the pure water flux (PWF), and a decrease in insulin rejection. Further increases in the PVP concentration from 1.5 to 3, 6, and 9 wt % resulted in gradual suppression of the macrovoid formation, a decrease in PWF, and an increase in insulin rejection. Higher PVP concentrations and lower CBT levels also appeared to result in higher glass-transition temperatures.

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“…There are, generally, two methods of producing NPs: i-physical methods such as gas phase deposition [18], electron beam lithography [19], microwave plasma [20] and laser pyrolysis [21,22] and ii-chemical method mainly using ferric and ferrous chloride as base source but under different synthesizing conditions [23][24][25]. Applying an appropriate amount of polyvinyl alcohol (PVA) on SPIONs prevents their aggregation mostly via steric hindrance mechanism and gives rise to mono-dispersed NPs [26][27][28][29][30][31]. The measurement of the suspension's viscosity can be used to characterize the microstructural state of a dispersion.…”

Section: Introductionmentioning

confidence: 99%

Preparation and rheological studies of uncoated and PVA-coated magnetite nanofluid

Khosroshahi

Ghazanfari

2012

Journal of Magnetism and Magnetic Materials

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Poly(vinyl alcohol)-iron oxide nanocomposite membranes for pervaporation dehydration of isopropanol, 1,4-dioxane and tetrahydrofuran

Cited by 93 publications

References 18 publications

Recent advances in surface engineering of superparamagnetic iron oxide nanoparticles for biomedical applications

Recent advances in surface engineering of superparamagnetic iron oxide nanoparticles for biomedical applications

Effect of poly(vinyl pyrrolidone) concentration and coagulation bath temperature on the morphology, permeability, and thermal stability of asymmetric cellulose acetate membranes

Preparation and rheological studies of uncoated and PVA-coated magnetite nanofluid

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