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Organic foams stabilized by Biphenyl-bridged organosilica particles

Feng, Andong, Dedovets, Dmytro, Gu, Yunjiao, Zhang, Shi, Sha, Jin, Han, Xia and Pera Titus, Marc 2022. Organic foams stabilized by Biphenyl-bridged organosilica particles. Journal of Colloid and Interface Science 617 , pp. 171-181. 10.1016/j.jcis.2022.02.034
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Abstract

Hypothesis Can surface-active particles be designed à la carte just by incorporating functional groups mimicking the structure of the solvent and gas? This is based on the idea that, to achieve good foamability, the particle wettability needs to be finely tuned to adjust the liquid-particle and gas-particle surface tensions. In practice, could particles containing phenyl rings and alkyl chains assemble at the air–liquid interface and stabilize foams based on aromatic solvents? Experiments A library of organosilica particles was prepared by sol–gel synthesis using aromatic organosilane precursors. The particles were characterized by TGA, FTIR and 13C/29Si MAS NMR. The foaming properties were studied after hand shaking and high-speed homogenization. The influence of particle wettability and solvent properties on foam formation was systematically investigated. A comparison was carried out between biphenyl-bridged particles and various stabilizers on foamability in benzyl alcohol. Findings Biphenyl-bridged particles could stabilize foams in aromatic solvents with a high foam volume fraction up to 96% using Ultra-Turrax. The presence of biphenyl rings and short alkyl chains was crucial for foamability. Organic foams were prepared for aromatic solvents with intermediate surface tension (35–44 mN m−1) and contact angle in the range 32–53°. Biphenyl-bridged particles outperformed polytetrafluoroethylene and fluorinated surfactants in benzyl alcohol.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
Funders: ERC grant Michelangelo (ref. 771586)
Date of First Compliant Deposit: 28 March 2022
Date of Acceptance: 8 February 2022
Last Modified: 12 May 2022 17:54
URI: https://orca.cardiff.ac.uk/id/eprint/148922

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