Effects of surfactants and pH of medium on zeta potential and aggregation stability of titanium dioxide suspensions

Petryshyn, R.; Yaremko, Z. M.; Soltys, M. N.

doi:10.1134/s1061933x10040125

Cited by 25 publications

(11 citation statements)

References 13 publications

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“…Similar results were observed in AL-CS nanoemulsion encapsulating sacha inchi oil. According to the literature, non-ionic surfactants like poloxamer do not significantly affect the zeta-potential [39,40]. However, in our study, a variation of the zeta-potential was observed with poloxamer concentration (Figure 5B).…”

Section: Resultssupporting

confidence: 47%

Ultrasound-Assisted Encapsulation of Sacha Inchi (Plukenetia volubilis Linneo.) Oil in Alginate-Chitosan Nanoparticles

et al. 2019

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Sacha inchi oil is rich in essential and non-essential fatty acids and other types of bioactive agents like tocopherols and polyphenolic compounds, which are very well-known antioxidants. In this study, the encapsulation of sacha inchi oil in alginate (AL) and chitosan (CS) nanoparticles was achieved with the assistance of high-intensity ultrasound. Nanoemulsion is the most effective delivery and high stability system for lipophilic bioactive agents. Chitosan and surfactant concentrations were varied to study their effect on particle formulations. Size, zeta-potential, polydispersity, and stability of particles were determined in time to optimize the preparation conditions. Sacha inchi oil encapsulated in AL-CS nanoparticles showed a higher loading efficiency and stability for short and long periods compared with other vegetable oils such as olive and soybean. Also, because of the types of tocopherols present in sacha inchi oil (γ- and δ-tocopherols), a much higher antioxidant activity (95% of radical reduction in 15 min) was found in comparison with nanocapsules with olive oil, which contain α-tocopherols. The particles showed high efficiency of protein loading at high concentration of bovine serum albumin (BSA) and a low rate of leaching profiles in various testing media like simulated gastric and intestinal fluids with/without enzymes, that is, pepsin 0.1% (w/v) and pancreatin 0.1% (w/v), respectively.

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Section: Resultssupporting

confidence: 47%

Ultrasound-Assisted Encapsulation of Sacha Inchi (Plukenetia volubilis Linneo.) Oil in Alginate-Chitosan Nanoparticles

et al. 2019

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“…Since the traditional DLVO theory was insufficient to describe the transport and deposition of CeO 2 NPs in the sand filters at 10 mM NaCl, as discussed previously, a steric repulsive energy was added to the total interaction energy to better describe the energy profile between NOM coated CeO 2 NPs and sand surfaces. Steric repulsion between two surfaces results from volume restriction and osmotic effects (Brown and Jaffé, 2001;Petryshyn et al, 2010). The former takes place from the reduction of space in the zone between particle surfaces; the later arises from the high concentration of adsorbed charged macromolecules in the region between the surfaces as they approach each other.…”

Section: Transport Of Ceo 2 Nps In Porous Media In the Presence Of Ormentioning

confidence: 99%

Effects of source and seasonal variations of natural organic matters on the fate and transport of CeO2 nanoparticles in the environment

Sahle‐Demessie

Hassan

et al. 2017

Science of The Total Environment

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Natural organic matter (NOM) affects the stability and transport of nanoparticles (NPs) in natural waters by modifying their physiochemical properties. Source location, and seasonal variations, influence their molecular, physical and electrical charge properties. To understand the variations of NOM on the mobilization of NPs, large volumes of water were collected from the Ohio River (OR) over winter and summer seasons and dissolved NOMs were concentrated. The chemical and structural differences of these NOMs were compared with the Suwannee River humic acid (SRHA) SRHA using H andC nuclear magnetic resonance spectroscopy, and Fourier transforms infrared (FTIR) spectroscopy. Thermal analysis and FTIR confirmed that differences in composition, structure, and functional groups are a result of SRHA fractionation compared to whole molecule OR-NOM. The influence of OR-NOMs on the surface charge of CeO NPs and the effects on the transport and retention in a three-phase (deposition-rinse-re-entrainment) sand-packed columns were investigated at CeO NPs initial concertation of 10ppm, pH6.8, increasing ionic strength (3, 5, and 10mM), retention time of 1min, and increasing NOM concentration (1, 5, and 10ppm). The summer OR-NOM showed higher stabilization and mobilization effect on the CeO than the winter NOM; while their effect was very different form the SRHA. The stabilization of NPs is attributed to both electrostatic and steric effects. The differences in the chemical structure of the complex and heterogeneous NOMs showed disparate reactivity and direct impact on CeO-NPs stability. Using SRHA to study the effect of NOM for drinking water related assessment does not sufficiently represent the natural conditions of the environment.

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“…Petryshyn and co-workers have shown that the properties of suspended TiO 2 can be controlled by pH and by the type of surfactant. In this study, the nonionic surfactant had no influence on the surface charge density or the aggregation capacity of the particles, but the same behavior was not observed when ionic surfactants were employed, since these materials altered the pH of the formulation and thus the nanoparticle surface charge (Petryshyn, Yaremko, Soltys, 2010), resulting in changes to the aggregation process. The cosmetic base of synthetic or natural polymer gel has a transparent look, however, on adding these inorganic UV filters, even as microparticles, leads to formation of a turbid gel, due to the white color of TiO 2 and ZnO, since they are insoluble oxides and may form large aggregates (Flor, Davolos, Correa, 2007).…”

Section: Inorganic Uv Filters: Tio 2 and Znomentioning

confidence: 84%

Inorganic UV filters

Manaia

Kaminski

Corrêa

et al. 2013

Braz. J. Pharm. Sci.

105

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Nowadays, concern over skin cancer has been growing more and more, especially in tropical countries where the incidence of UVA/B radiation is higher. The correct use of sunscreen is the most efficient way to prevent the development of this disease. The ingredients of sunscreen can be organic and/or inorganic sun filters. Inorganic filters present some advantages over organic filters, such as photostability, non-irritability and broad spectrum protection. Nevertheless, inorganic filters have a whitening effect in sunscreen formulations owing to the high refractive index, decreasing their esthetic appeal. Many techniques have been developed to overcome this problem and among them, the use of nanotechnology stands out. The estimated amount of nanomaterial in use must increase from 2000 tons in 2004 to a projected 58000 tons in 2020. In this context, this article aims to analyze critically both the different features of the production of inorganic filters (synthesis routes proposed in recent years) and the permeability, the safety and other characteristics of the new generation of inorganic filters.Uniterms: Skin cancer. Sunscreen. Inorganic UV filter.A preocupação com o câncer de pele hoje em dia vem crescendo cada vez mais principalmente em países tropicais, onde a incidência da radiação UVA/B é maior. O uso correto de protetores solares é a forma mais eficaz de prevenir o aparecimento desta doença. Os ativos utilizados em protetores solares podem ser filtros orgânicos e inorgânicos. Filtros inorgânicos apresentam muitas vantagens em relação aos orgânicos, tais como fotoestabilidade, ausência de irritabilidade e amplo espectro de proteção. Entretanto, em razão de apresentarem alto índice de refração, os ativos inorgânicos conferem aos protetores solares aparência esbranquiçada, diminuindo sua atratividade estética. Muitas alternativas têm sido desenvolvidas no sentido de resolver este problema e dentre elas pode-se destacar o uso da nanotecnologia. Estima-se que o uso de nanomateriais deve crescer das atuais 2000 para 58000 toneladas até 2020. Neste sentido, este trabalho tem como objetivo fazer a análise crítica abordando diferentes aspectos envolvidos tanto na obtenção de protetores solares inorgânicos (rotas de sínteses propostas nos últimos anos) quanto na permeabilidade, na segurança e em outros aspectos relacionados à nova geração de filtros solares inorgânicos. Unitermos: Câncer de pele. Protetores solares. Filtros inorgânicos.

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Effects of surfactants and pH of medium on zeta potential and aggregation stability of titanium dioxide suspensions

Cited by 25 publications

References 13 publications

Ultrasound-Assisted Encapsulation of Sacha Inchi (Plukenetia volubilis Linneo.) Oil in Alginate-Chitosan Nanoparticles

Ultrasound-Assisted Encapsulation of Sacha Inchi (Plukenetia volubilis Linneo.) Oil in Alginate-Chitosan Nanoparticles

Effects of source and seasonal variations of natural organic matters on the fate and transport of CeO2 nanoparticles in the environment

Inorganic UV filters

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