Surface Charge and Conductance in Dispersions of Titania in Nonaqueous and Mixed Solvents

Kosmulski, Marek; Dahlsten, Per; Próchniak, Piotr; Rosenholm, Jarl B.

doi:10.1007/978-3-642-19038-4_10

Cited by 1 publication

(2 citation statements)

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“…However, when dispersed in water/ethanol mixtures, although the PST NPs remain negatively charged (Figure B), the TiO 2 NPs appear to have a positive ζ-potential (Figure B). This charge transition for TiO 2 NPs dispersed in water/ethanol mixtures has been previously reported. , …”

Section: Resultssupporting

confidence: 84%

“…This charge transition for TiO 2 NPs dispersed in water/ethanol mixtures has been previously reported. 35,36 Figure 3 illustrates the aggregation state of TiO 2 NPs in three characteristic probing liquids, i.e., pure water and pure ethanol with surface tensions of 71.4 and 22.3 mJ/m 2 , respectively, and the water/ethanol mixture with a surface tension of 30.4 mJ/m 2 in which the TiO 2 NPs are expected to be maximally dispersed. Figure S1 shows the size distribution of the TiO 2 NPs dispersed in these three probing liquids, determined with DLS.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Quantitative Determination of the Hydrophobicity of Nanoparticles

Cao

et al. 2022

Anal. Chem.

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The hydrophobicity of nanoparticles (NPs) is one of the most important physicochemical properties that determines their agglomeration state under various environmental conditions. When studying nano−bio interactions, it is found that the hydrophobicity of NPs plays a predominant role in mediating the biological response and toxicity of the NPs. Although many methods have been developed to qualitatively or quantitatively determine hydrophobicity, there is not yet a scientific consensus on the standard of characterizing the hydrophobicity of NPs. We have developed a novel optical method, called the maximum particle dispersion (MPD), for quantitatively characterizing the hydrophobicity of NPs. The principle of measurement of the MPD method lies in the control of the aggregation state of the NPs via manipulating the van der Waals interactions between NPs across a dispersion liquid. We have scrutinized the mechanism of the MPD method using a combination of dynamic light scattering and atomic force microscopy and further verified the MPD method using a completely independent dye adsorption method. The MPD method demonstrated great promise to be developed into an easy-to-use and cost-effective method for quantitatively characterizing the hydrophobicity of NPs.

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Section: Resultssupporting

confidence: 84%

Section: ■ Results and Discussionmentioning

confidence: 99%