Role of deflocculants on the rheological properties of boehmite sol

Vishista, K.; Gnanam, F. D.

doi:10.1016/j.matlet.2003.10.029

Cited by 21 publications

(15 citation statements)

References 21 publications

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“…In particular, we have used the surfactants, citric acid and sodium citrate and the polyelectrolytes DXS, PSS, PAH and PLL. The use of surfactants is a simple and effective inorganic colloids stabilisation method, it is a good alternative to the surface modification method (polymeric coating; Hidber et al 1996;Vishista and Gnanam 2004). The Sodium Citrate has a greater capacity of colloidal suspensions dispersion (under basic conditions) than the other surfactants of common use (such as citric acid and ammonium carbonate; Leeuwenburgh et al 2010).…”

Section: Preparation and Characterisation Of Aqueous Suspensions Of Imentioning

confidence: 99%

A predictive model of iron oxide nanoparticles flocculation tuning Z-potential in aqueous environment for biological application

2015

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Iron oxide nanoparticles are the most used magnetic nanoparticles in biomedical and biotechnological field because of their nontoxicity respect to the other metals. The investigation of iron oxide nanoparticles behaviour in aqueous environment is important for the biological applications in terms of polydispersity, mobility, cellular uptake and response to the external magnetic field. Iron oxide nanoparticles tend to agglomerate in aqueous solutions; thus, the stabilisation and aggregation could be modified tuning the colloids physical proprieties. Surfactants or polymers are often used to avoid agglomeration and increase nanoparticles stability. We have modelled and synthesised iron oxide nanoparticles through a co-precipitation method, in order to study the influence of surfactants and coatings on the aggregation state. Thus, we compared experimental results to simulation model data. The change of Z-potential and the clusters size were determined by Dynamic Light Scattering. We developed a suitable numerical model to predict the flocculation. The effects of Volume Mean Diameter and fractal dimension were explored in the model. We obtained the trend of these parameters tuning the Z-potential. These curves matched with the experimental results and confirmed the goodness of the model. Subsequently, we exploited the model to study the influence of nanoparticles aggregation and stability by Z-potential and external magnetic field. The highest Z-potential is reached up with a small external magnetic influence, a small aggregation and then a high suspension stability. Thus, we obtained a predictive model of Iron oxide nanoparticles flocculation that will be exploited for the nanoparticles engineering and experimental setup of bioassays.

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Section: Preparation and Characterisation Of Aqueous Suspensions Of Imentioning

confidence: 99%

A predictive model of iron oxide nanoparticles flocculation tuning Z-potential in aqueous environment for biological application

2015

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“…In spite of many studies [21][22][23] regarding the electrostatic or electrosteric mechanism of alumina stabilization, the destabilizing effect of excess dispersant is not entirely understood. It is assumed that the destabilization may result from a ''depletion flocculation'' mechanism [21,24] or from a reduction of repulsive forces between particles [22].…”

Section: Slurry Characterizationmentioning

confidence: 99%

“…Consequently, at this low pH range, the particle surface is positively charged whereas the polyelectrolyte (acrylic acid) molecules are uncharged and have a low affinity for the solvent, which in turn results in a small (or) non-existent steric effect. Subsequently, deflocculating occurs from electrostatic repulsion between the particles [24].…”

Section: Effect Of Phmentioning

confidence: 99%

Wall coating optimization for microchannel reactors

et al. 2007

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“…For the stabilization of nano‐Fe 3 O 4 synthesized, a treatment with surfactant (sodium citrate, CA) was carried out. The use of surfactants appears to be a simple and effective stabilization method of ceramic colloids alternative to surface modification via polymer coating . CA has an improved capacity of dispersion of colloidal suspensions (under basic conditions) compared to other surfactants of common use (such as citric acid and ammonium carbonate) .…”

Section: Resultsmentioning

confidence: 99%

Polymer‐Coated Magnetic Nanoparticles for Curcumin Delivery to Cancer Cells

Mancarella

Greco

Baldassarre

et al. 2015

Macromolecular Bioscience

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The new goal of anticancer agent research is the screening of natural origin drugs with lower systemic adverse effects than synthetic compounds. Here, we focus on curcumin, an important polyphenolic pigment classically used as spice in the Indian cuisine. The molecule has high pleiotropic activities including strong antioxidant and anti-inflammatory properties. However, its clinical potential is limited due its low solubility and bioavailability. We have developed a layer by layer functionalization of Fe3 O4 nanoparticles (nano-Fe3 O4 ) by coating biodegradable polyelectrolyte multilayers such as Dextran (DXS) and Poly(l-lysine) (PLL). Physico-chemical studies were performed to obtain a high upload of curcumin in Fe3 O4 nanoparticles. Nano-Fe3 O4 were then tested against an ovarian cancer cell line, SKOV-3, to demonstrate their therapeutic efficacy.

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Role of deflocculants on the rheological properties of boehmite sol

Cited by 21 publications

References 21 publications

A predictive model of iron oxide nanoparticles flocculation tuning Z-potential in aqueous environment for biological application

A predictive model of iron oxide nanoparticles flocculation tuning Z-potential in aqueous environment for biological application

Wall coating optimization for microchannel reactors

Polymer‐Coated Magnetic Nanoparticles for Curcumin Delivery to Cancer Cells

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