Effect of chemical modification on surface free energy components of Aerosil silica powders determined with capillary rise technique

Alloul, Haytham; Roques-Carmes, Thibault; Hamieh, Tayssir; Razafitianamaharavo, Angélina; Barrès, Odile; Toufaily, Joumana; Villièras, Frédéric

doi:10.1016/j.powtec.2013.06.016

Cited by 25 publications

(6 citation statements)

References 52 publications

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“…In the present case, the surface free energies of water and silica particles [31] are relatively close, and water is a good solvent for moderately-modified methylcelluloses (average degree of substitution (DS) of the water soluble blocks <1.8). In these conditions, fewer hydrophobic trains are adsorbed, counterbalanced by larger loops and larger adsorbed layer thickness when the molar mass increases.…”

Section: Adsorption Isothermmentioning

confidence: 68%

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Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

et al. 2014

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Abstract:The interfacial interactions of four methylcelluloses having the same average degree of substitution and distribution of methyl groups, but different molar masses, are studied at ambient temperature and at very low polymer concentrations. Firstly, the surface tension σ at the water/air interface is determined for the progressive addition of methylcellulose up to 100 mg/L; σ starts to decrease over 1 mg/L up to the critical aggregation concentration (CAC) at 10 mg/L. The curves describing the influence of polymer concentration on σ are independent of the molar mass at equilibrium. Secondly, the adsorption of methylcellulose on silica particles is estimated from ζ-potential measurements. The data are interpreted in terms of an increase of the adsorbed layer thickness at the interface when the molar mass of methylcellulose increases. It is concluded that methylcellulose is adsorbed, forming trains and loops at the interface based on the equilibrium between surface free energy and solvent quality.

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Section: Adsorption Isothermmentioning

confidence: 68%

“…Different methods have been proposed to study the adsorption of a polymer at a solid interface [25][26][27][28][29][30][31]. The technique has to be chosen in dependence of the system studied (the nature of the neutral or charged polymer, the bulk concentration of the polymer, the external salt concentration).…”

Section: Adsorption Isothermmentioning

confidence: 99%

Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

et al. 2014

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“…Polyoxyethylene (20) [20]. This strong Si-O-Si linkage presents excellent thermal and chemical stability [21]. Getting of oil-in-water or water-…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Sol–gel microencapsulation of oil phase with Pickering and nonionic surfactant based emulsions

2015

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“…The contact angle tests are used to determine the surface cleanliness of these metals [2,3]. The surface cleanliness is related to the wetness degree of water on the surfaces, and the angle between the tangent line of gas-liquid interface and solid-liquid boundary, namely the contact angle, can determine the wetness [4][5][6][7]. For example, if the contact angle is less than 90°, the materials are hydrophilic and expected to be clean; otherwise they are hydrophobic materials which may be polluted by oil and other impurities [8].…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects of Water-Metallic Interface Energies and Their Influence on Contact Angle Test for Surface Cleanliness: A Combined Experimental and Molecular Simulation Study

Jiang¹,

Niu²,

Zhou³

et al. 2021

Preprint

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To ensure the effectiveness of the high-power-laser facilities, the cleanliness of metal parts is of significance. In this paper, molecular modelings combined with contact angle tests were performed, in order to investigate the temperature effects of water-metallic interface energies and their influence on the tests for surface cleanliness. As results, the attractive forces were found between water and metallic surfaces, in which van der Waals forces contribute most, and the energies raised with elevated temperatures from 291 K to 303 K; meanwhile, the contact angle tests show both the Al and Fe components are hydrophilic, and the contact angle reduced with elevated temperatures; furthermore, correlations can be found between the energy change and the contact angle at varying temperatures. These conclusions are helpful in the accurate testing of surface cleanliness for optical scientific facilities.

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Effect of chemical modification on surface free energy components of Aerosil silica powders determined with capillary rise technique

Cited by 25 publications

References 52 publications

Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

Sol–gel microencapsulation of oil phase with Pickering and nonionic surfactant based emulsions

Temperature Effects of Water-Metallic Interface Energies and Their Influence on Contact Angle Test for Surface Cleanliness: A Combined Experimental and Molecular Simulation Study

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