TiO2 nanoparticle dispersions in water and nonaqueous solvents studied by gravitational sedimentation analysis: Complementarity of Hansen Parameters and DLVO interpretations

Delforce, Lucie; Hofmann, Evamaria; Nardello‐Rataj, Véronique; Aubry, Jean‐Marie

doi:10.1016/j.colsurfa.2021.127333

Cited by 25 publications

(5 citation statements)

References 45 publications

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“…The local reaction depends on a series of factors inherent to the local pH of the internal environment or the surface charge of the nanoparticles, the positively charged ones being more toxic since they enter cells more quickly than the negative and neutral ones [238]. In this sense, it is essential to keep in mind the difference in the ionic solubility of the different compounds, which change according to the dispersion media properties being different between aqueous and organic solvents [239]. There are other parameters to consider regarding the solubility of inorganic nanoparticles, which tends to increase in acidic solutions, such as gastric fluids [201].…”

Section: Physical Chemical Propertiesmentioning

confidence: 99%

Application of Inorganic Nanomaterials in Cultural Heritage Conservation, Risk of Toxicity, and Preventive Measures

2023

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Nanotechnology has allowed for significant progress in architectural, artistic, archaeological, or museum heritage conservation for repairing and preventing damages produced by deterioration agents (weathering, contaminants, or biological actions). This review analyzes the current treatments using nanomaterials, including consolidants, biocides, hydrophobic protectives, mechanical resistance improvers, flame-retardants, and multifunctional nanocomposites. Unfortunately, nanomaterials can affect human and animal health, altering the environment. Right now, it is a priority to stop to analyze its advantages and disadvantages. Therefore, the aims are to raise awareness about the nanotoxicity risks during handling and the subsequent environmental exposure to all those directly or indirectly involved in conservation processes. It reports the human–body interaction mechanisms and provides guidelines for preventing or controlling its toxicity, mentioning the current toxicity research of main compounds and emphasizing the need to provide more information about morphological, structural, and specific features that ultimately contribute to understanding their toxicity. It provides information about the current documents of international organizations (European Commission, NIOSH, OECD, Countries Normative) about worker protection, isolation, laboratory ventilation control, and debris management. Furthermore, it reports the qualitative risk assessment methods, management strategies, dose control, and focus/receptor relationship, besides the latest trends of using nanomaterials in masks and gas emissions control devices, discussing their risk of toxicity.

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Section: Physical Chemical Propertiesmentioning

confidence: 99%

Application of Inorganic Nanomaterials in Cultural Heritage Conservation, Risk of Toxicity, and Preventive Measures

2023

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“…203 However, both DLVO theory and ζ-potential analysis are most reliable in aqueous solutions or in polar organic solvents with high dielectric constants; in more nonpolar organic solvents, other forces such as solute−solvent interactions have a larger effect. 207 Additionally, NCs suspended in nonpolar organic solvents are often terminated by long chain ligands; for these samples, steric repulsion by these large organic ligands may have greater contribution than electrostatic repulsion toward preventing NC aggregation. Nevertheless, if the NC surface charge is postsynthetically modified via surface reduction/ oxidation or ligand exchange, it is likely that these electrostatic changes may have a non-negligible effect upon colloidal stability.…”

Section: Effects Of Surface Electrostaticsmentioning

confidence: 99%

“…Ligand-exchanged CdSe NCs have been shown to be colloidally stable when |ζ-potential| > 30 mV . However, both DLVO theory and ζ-potential analysis are most reliable in aqueous solutions or in polar organic solvents with high dielectric constants; in more nonpolar organic solvents, other forces such as solute–solvent interactions have a larger effect . Additionally, NCs suspended in nonpolar organic solvents are often terminated by long chain ligands; for these samples, steric repulsion by these large organic ligands may have greater contribution than electrostatic repulsion toward preventing NC aggregation.…”

Section: Nc Surface Electrostaticsmentioning

confidence: 99%

Redox Reactions at Colloidal Semiconductor Nanocrystal Surfaces

2023

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The adaptation of colloidal semiconductor nanocrystals (NCs) in applications like displays, photovoltaics, and photocatalysis relies primarily on the core electronic structure of NC materials that give rise to desirable optoelectronic properties like broad absorption and size-tunable emission. However, reduction or oxidation events at localized NC surface sites can greatly affect sample stability and device efficiencies by contributing to NC degradation and carrier trapping. Understanding the local composition, structure, and electrochemical potentials of redox-active NC surface sites continues to present a challenge. In this perspective, we discuss how NC surface reduction, oxidation, and electrostatics contribute to NC electronic properties that include photoluminescence quenching or brightening and shifts in NC band edge potentials, among others. Recent efforts toward combining spectroscopic, electrochemical, and computational methods to characterize redox-active surface sites and trap states are highlighted, including developing methods in the field and future opportunities.

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“…The results seen in Figure 4 showed that destabilization of HAp, HAp@Cal, and HAp@Cal@5-flu dispersion occurs due to sedimentation. This is evidenced by an increase in the clarity of the suspension in the upper layer with increasing time tests [77][78][79]. To analyze the destabilization kinetics of the obtained dispersions, the Turbiscan Stability Index (TSI) (Turbiscan-specific parameter) was used, which allows us to compare several systems to each other.…”

Section: Turbiscan Analysismentioning

confidence: 99%

Nanohydroxyapatite Loaded with 5-Fluorouracil and Calendula officinalis L. Plant Extract Rich in Myo-Inositols for Treatment of Ovarian Cancer Cells

Osial,

Wilczewski,

Szulc

et al. 2023

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In this study, the hydroxyapatite (HAp) in the form of nanoparticles was synthesized through the wet co-precipitation method and loaded with plant extract from Calendula officinalis L. rich in biologically active myo-inositol, and the 5-fluorouracil anticancer drug. The obtained nanomaterials have rod-like structures approx. 30 nm in diameter and 100 nm in length. FT-IR analysis results proved the immobilization of biologically active compounds. The loading of plant extract into the carrier improved the stability of colloidal suspension, which was confirmed with turbidimetry. The composite modified with calendula extract and drug (HAp@Cal@5-flu) effectively scavenges the DPPH radicals, with a radical scavenging activity (RSA) of about 20.0 ± 1.3%. The effect is supported by the DFT calculations of the HOMO-LUMO, presenting the chemical reactivity of the molecules loaded into the HAp. The in vitro cytotoxicity results on SKOV-3 ovarian cancer cells show the pronounced cytotoxic effect of the HAp@Cal@5-flu. The calendula extract loading into the carrier provided better interactions with the tumorous biomimetic membranes studied with a Langmuir trough, making it a promising material in nano-biomedicine, including drug delivery and targeted cancer treatment.

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TiO2 nanoparticle dispersions in water and nonaqueous solvents studied by gravitational sedimentation analysis: Complementarity of Hansen Parameters and DLVO interpretations

Cited by 25 publications

References 45 publications

Application of Inorganic Nanomaterials in Cultural Heritage Conservation, Risk of Toxicity, and Preventive Measures

Application of Inorganic Nanomaterials in Cultural Heritage Conservation, Risk of Toxicity, and Preventive Measures

Redox Reactions at Colloidal Semiconductor Nanocrystal Surfaces

Nanohydroxyapatite Loaded with 5-Fluorouracil and Calendula officinalis L. Plant Extract Rich in Myo-Inositols for Treatment of Ovarian Cancer Cells

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