Effect of surfactants, pH and water hardness on the surface properties and agglomeration behavior of engineered TiO<sub>2</sub> nanoparticles

Loosli, Frédéric; Stoll, Serge

doi:10.1039/c6en00339g

Cited by 46 publications

(37 citation statements)

References 53 publications

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“…In addition, the zeta potential value was −54.1 ± 0.3 mV, indicating high colloidal stability. The negative charge is associated to the presence of SDS (an anionic surfactant) adsorbed on the surface of the particles . TEM images corroborate with results obtained by DLS for average particle size and confirm the spherical morphology of the NPs.…”

Section: Resultssupporting

confidence: 81%

Covalently Binding of Bovine Serum Albumin to Unsaturated Poly(Globalide‐Co‐ε‐Caprolactone) Nanoparticles by Thiol‐Ene Reactions

Guindani

Frey

Simon

et al. 2019

Macromolecular Bioscience

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When nanoparticles (NPs) are introduced to a biological fluid, different proteins (and other biomolecules) rapidly get adsorbed onto their surface, forming a protein corona capable of giving to the NPs a new "identity" and determine their biological fate. Protein-nanoparticle conjugation can be used in order to promote specific interactions between living systems and nanocarriers. Non-covalent conjugates are less stable and more susceptible to desorption in biological media, which makes the development of engineered nanoparticle surfaces by covalent attachment an interesting topic. In this work, the surface of poly(globalide-co-ε-caprolactone) (PGlCL) nanoparticles containing double bonds in the main polymer chain is covalently functionalized with bovine serum albumin (BSA) by thiol-ene chemistry, producing conjugates which are resistant to dissociation. The successful formation of the covalent conjugates is confirmed by flow cytometry (FC) and fluorescence correlation spectroscopy (FCS). Transmission electron microscopy (TEM) allows the visualization of the conjugate formation, and the presence of a protein layer surrounding the NPs can be observed. After conjugation with BSA, NPs present reduced cell uptake by HeLa and macrophage RAW264.7 cells, in comparison to uncoated NP. These results demonstrate that it is possible to produce stable conjugates by covalently binding BSA to PGlCL NP through thiol-ene reaction.

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Section: Resultssupporting

confidence: 81%

Covalently Binding of Bovine Serum Albumin to Unsaturated Poly(Globalide‐Co‐ε‐Caprolactone) Nanoparticles by Thiol‐Ene Reactions

Guindani

Frey

Simon

et al. 2019

Macromolecular Bioscience

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“…pH affects metal species in solution. It also alters the surface properties of adsorbents in terms of dissociation of functional groups and surface charge 21 .…”

Section: Resultsmentioning

confidence: 99%

Fast, Cost-effective and Energy Efficient Mercury Removal-Recycling Technology

Ganguly

Dib

Ariya

2018

Sci Rep

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We herein present a novel and sustainable technology for mercury recycling, with the maximum observed uptake capacity. Facile synthesis of the most efficient (~1.9 gg−1) nano-trap, made of montmorillonite-Fe-iron oxides, was performed to instantaneously remove mercury(II) ions from water. Elemental Hg was recovered from the adduct, by employing Fe granules, at ambient conditions. Varied pHs and elevated temperatures further enhanced this already highly efficient recycling process. The reduction of Hg(II) to Hg(I) by the nano trap and Hg(I) to Hg(0) by Fe granules are the main driving forces behind the recycling process. Facile sustainable recycling of the nano-trap and Fe granules require no additional energy. We have further developed a recyclable model for Hg nano-trap, which is inexpensive (<$5 CAD), and can remove mercury in a few seconds. This technology has multiple applications, including in the communities exposed to mercury contamination.

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“…Traditionally dispersion of hydrophobic particles in aqueous solution was achieved by using surfactants 10 – 12 or amphiphilic molecules 13 – 15 to modify particle surfaces to be hydrophilic. However, the using of surfactants or amphiphilic molecules has been suffering from several issues 16 – 19 . Surfactants as additives generally require a large amount to supplement into the native solution to reach a critical concentration for camouflaging particle surface, and this may induce undesirable impacts to the native solution.…”

Section: Introductionmentioning

confidence: 99%

Nanospikes-mediated Anomalous Dispersities of Hydropobic Micro-objects and their Application for Oil Emulsion Cleaning

Chen

Yang

Tian

et al. 2018

Sci Rep

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Many fields of applications require dispersion of hydrophobic particles in water, which is traditionally achieved by using surfactants or amphiphilic molecules to modify particle surfaces. However, surfactants or amphiphilic molecules may disturb the native solution or particles’ surface hydrophobicity, limiting extended applications such as oil emulsion cleaning. Recently one example of 2 μm-size polystyrene microparticles covered with ZnO nanospikes has been shown to exhibit excellent dispersity in water in spite of surface hydrophobicity. Whether this anomalous dispersion phenomenon was applicable to other hydrophobic microparticle systems was still unclear and its application scope was limited. Here the anomalous dispersities of different hydrophobic spiky micro-objects were systematically explored. The results show that the anomalous dispersion phenomenon was universally observed on different hydrophobic spiky micro-objects including different hydrophobic coating, particle sizes, material compositions and core particle morphologies. In addition, the spiky micro-objects displayed anomalous dispersity in water without compromising surface hydrophobicity, and their applications for oil spills absorption and oil emulsion cleaning were demonstrated. This work offers unique insight on the nanospikes-mediated anomalous dispersion phenomenon of hydrophobic micro-object and potentially extends its applicability and application scopes.

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Effect of surfactants, pH and water hardness on the surface properties and agglomeration behavior of engineered TiO₂ nanoparticles

Abstract: Multiple facets of TiO2 nanoparticle destabilization mechanisms in the presence of surfactant molecules and divalent cations.

Cited by 46 publications

References 53 publications

Covalently Binding of Bovine Serum Albumin to Unsaturated Poly(Globalide‐Co‐ε‐Caprolactone) Nanoparticles by Thiol‐Ene Reactions

Covalently Binding of Bovine Serum Albumin to Unsaturated Poly(Globalide‐Co‐ε‐Caprolactone) Nanoparticles by Thiol‐Ene Reactions

Fast, Cost-effective and Energy Efficient Mercury Removal-Recycling Technology

Nanospikes-mediated Anomalous Dispersities of Hydropobic Micro-objects and their Application for Oil Emulsion Cleaning

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Effect of surfactants, pH and water hardness on the surface properties and agglomeration behavior of engineered TiO2 nanoparticles

Abstract: Multiple facets of TiO2 nanoparticle destabilization mechanisms in the presence of surfactant molecules and divalent cations.

Cited by 46 publications

References 53 publications

Covalently Binding of Bovine Serum Albumin to Unsaturated Poly(Globalide‐Co‐ε‐Caprolactone) Nanoparticles by Thiol‐Ene Reactions

Covalently Binding of Bovine Serum Albumin to Unsaturated Poly(Globalide‐Co‐ε‐Caprolactone) Nanoparticles by Thiol‐Ene Reactions

Fast, Cost-effective and Energy Efficient Mercury Removal-Recycling Technology

Nanospikes-mediated Anomalous Dispersities of Hydropobic Micro-objects and their Application for Oil Emulsion Cleaning

Contact Info

Product

Resources

About

Effect of surfactants, pH and water hardness on the surface properties and agglomeration behavior of engineered TiO₂ nanoparticles