Magnetic Polystyrene Nanoparticles with a High Magnetite Content Obtained by Miniemulsion Processes

Higher environmental standards have made the removal of arsenic from water an important problem for environmental engineering. Iron oxide is a particularly interesting sorbent to consider for this application. Its magnetic properties allow relatively routine dispersal and recovery of the adsorbent into and from groundwater or industrial processing facilities; in addition, iron oxide has strong and specific interactions with both As(III) and As(V). Finally, this material can be produced with nanoscale dimensions, which enhance both its capacity and removal. The objective of this study is to evaluate the potential arsenic adsorption by nanoscale iron oxides, specifically magnetite (Fe 3 O 4 ) nanoparticles. We focus on the effect of Fe 3 O 4 particle size on the adsorption and desorption behavior of As(III) and As(V). The results show that the nanoparticle size has a dramatic effect on the adsorption and desorption of arsenic. As particle size is decreased from 300 to 12 nm the adsorption capacities for both As(III) and As(V) increase nearly 200 times. Interestingly, such an increase is more than expected from simple considerations of surface area and suggests that nanoscale iron oxide materials sorb arsenic through different means than bulk systems. The desorption process, however, exhibits some hysteresis with the effect becoming more pronounced with small nanoparticles. This hysteresis most likely results from a higher arsenic affinity for Fe 3 O 4 nanoparticles. This work suggests that Fe 3 O 4 nanocrystals and magnetic separations offer a promising method for arsenic removal. r

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“…These nanocrystals were then made water-soluble by methods similar to those seen in the work performed by Landfester and coworkers [14].…”

Section: Synthesis and Preparation Of Magnetite Nanocrystalsmentioning

confidence: 99%

The effect of nanocrystalline magnetite size on arsenic removal

Mayo

Yavuz

Yean

et al. 2007

Science and Technology of Advanced Materials

445

179

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“…T h e F e 3 O 4 c o r e s w e r e s y n t h e s i z e d b y a coprecipitation technique, well described by Mandal et al [52], and various other articles, using ferrous and ferric salts to form Fe 3 O 4 [53][54][55]. …”

Section: Synthesis Of Goldcoated Magnetite Nanoparticlesmentioning

confidence: 99%

Quantum Dot Conjugated Magnetic Nanoparticles for Targeted Drug Delivery and Imaging

Venugopal¹,

Pernal²,

Fusinatto³

et al. 2016

Nano BioMed ENG

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Nanotechnology is being increasingly applied for developing drug delivery options for specific treatments. Magnetic nanoparticles have drawn attention as drug delivery vehicles due to their stability, biocompatibility and ability to be non-invasively guided to desired target areas using magnetic fields. In this paper, we describe a new delivery vehicle for magnetic drug targeting. In magnetic drug targeting, drug functionalized magnetic nanoparticles are guided and localized at specific sites using external magnetic fields. Magnetic nanoparticles act as contrast agents for magnetic resonance imaging. However, it cannot be visualized via this technique during drug delivery. This is between magnetic fields used for imaging and delivery can interference with each other. Our laboratory has synthesized a magnetic drug targeting vehicle conjugated with quantum dots that can be imaged during the drug delivery process with in vivo imaging techniques such as fluorescence molecular tomography. These nanocomposites can be used as drug delivery vehicles for the central nervous system, where drug targeting is especially difficult and minimizing side effects is critical.

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“…16), a threestep process was used for the generation of aggregates of primary magnetite nanoparticles and subsequently encapsulate them in a polystyrene matrix. 125,126 In the first step, magnetite nanoparticles are coprecipitated from ferrous and ferric chloride, to yield magnetite particles of about 10 nm in diameter. After hydrophobization of the primary FIGURE 15 Inhibition of clathrin mechanism.…”

Section: Magnetite As Markermentioning

confidence: 99%

From polymeric particles to multifunctional nanocapsules for biomedical applications using the miniemulsion process

Landfester

Musyanovych

Mailänder

2009

J. Polym. Sci. A Polym. Chem.

Self Cite

164

122

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ABSTRACT:The miniemulsions process represents a versatile tool for the formation of polymeric nanoparticles consisting of different kinds of polymer as obtained by a variety of polymerization types ranging from radical, anionic, cationic, enzymatic polymerization to polyaddition, and polycondensation. The process perfectly allows the encapsulation of hydrophilic and hydrophobic liquids and solids in polymeric shells, molecularly dissolved dyes or other components. In combination with a specific functionalization of the nanoparticles' or nanocapsules' surfaces and the possibility to release substances in a defined way from the interior, complex nanoparticles or nanocapsules are obtained, which are ideally suited for application in biomedical application as marker and targeted drug-delivery system. V C 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 2010

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Magnetic Polystyrene Nanoparticles with a High Magnetite Content Obtained by Miniemulsion Processes

Cited by 392 publications

References 24 publications

The effect of nanocrystalline magnetite size on arsenic removal

The effect of nanocrystalline magnetite size on arsenic removal

Quantum Dot Conjugated Magnetic Nanoparticles for Targeted Drug Delivery and Imaging

From polymeric particles to multifunctional nanocapsules for biomedical applications using the miniemulsion process

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