Switchable surfactants
SpletSwitchable materials in general and CO 2-switchable materials in particular are of great interest in environmental research.The replacement of common non-switchable … Splet05. feb. 2012 · Switchable surfactants are environment-friendly compounds, which can be separated from the system or lose surface activity after completing their function during one stage of a process. In order to study switchable properties of a kind of CO2 switchable surfactant with an imidazoline group, four 2-alkyl-1-hydroxyethylimidazolines were …
Switchable surfactants
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SpletThree switchable anionic surfactants (sodium 2-nitro-4- ( (octyloxy)carbonyl)phenolate ( 1a ), sodium 4- (octyloxy) benzoate ( 3a) and sodium laurate ( 4a )) and two commercial nonswitchable surfactants (sodium dodecyl sulfate (SDS) and Triton X-100) were evaluated for their ability to wash Ottawa Sand artificially contaminated with North Sea … Splet13. okt. 2014 · Using a switchable surfactant, N ′-dodecyl- N, N -dimethylacetamidinium bicarbonate, which can be switched between a cationic surfactant and a surface-inactive neutral form by bubbling with CO 2 and N 2 respectively, bare silica nanoparticles can be hydrophobised in situ to become surface-active nanoparticles and the switch of the …
Splet05. feb. 2012 · Switchable surfactants are environment-friendly compounds, which can be separated from the system or lose surface activity after completing their function during one stage of a process. In order to study switchable properties of a kind of CO 2 switchable surfactant with an imidazoline group, ... SpletWe report a simple and robust strategy to prepare pH-responsive biphasic Janus particles composed of polystyrene/poly (2-vinylpyridine) (PS/P2VP) homopolymers that are able to …
SpletThese switchable surfactants can be switched on by addition of CO 2 and switched off by the removal of CO 2. The structure of the switchable head group affects the surfactant's … Splet21. sep. 2024 · Molecular dynamics simulations have been performed to reveal the fundamental mechanism of the reversible emulsification/demulsification processes of a dodecane–saline system by a CO 2 -switchable surfactant that switches between active ( i.e., N ′-dodecyl- N, N -dimethylacetamidinium (DMAAH + )) and inactive ( i.e., N ′-dodecyl- …
SpletThe switchable surfactant may be useful in the oil industry, said Jessop. High-pressure water and carbon dioxide are often used to pump oil out of oilfields. The presence of natural surfactants in the crude mix means ’there’s a good chance you get an emulsion out the other end’, Jessop said.
Splet06. avg. 2024 · Photo-Switchable Surfactants for Responsive Air-Water Interfaces: Azo versus Arylazopyrazole Amphiphiles J Phys Chem B. 2024 Aug 6;124(31):6913-6923. doi: 10.1021/acs.jpcb.0c02848. ... the surface excess Γ of the surfactants changed drastically between E and Z 2 2). Analysis of SFG spectra revealed that strong nonresonant … sma windy boy 1700SpletWe report a simple and robust strategy to prepare pH-responsive biphasic Janus particles composed of polystyrene/poly (2-vinylpyridine) (PS/P2VP) homopolymers that are able to control the reversible formation, breakage, and switching of Pickering emulsions depending on their geometry- and pH-dependent hydrophilic–lipophilic balance. sma winsSplet01. sep. 2012 · Switchable surfactants are environment-friendly compounds, which can be separated from the system or lose surface activity after completing their function during one stage of a process. sma wireless monitoringSwitchable surfactants have the additional advantages that their activity can be delayed until needed, they can be recovered and reused afterward, and their removal from the product stream can be facilitated by switching the surfactant to the form least soluble in the relevant medium. sma world cargoSplet16. sep. 2024 · Abstract. Residual surfactants in the oil phase after demulsification may cause several problems, such as self-emulsification of the oil and contamination of oil … high waisted velvet skirtSpletswitchable surfactant would be advanta-geous. As a preliminary demonstration that the amidine-based switchable surfactants can be used to protect growing particles during synthesis and then can be switched off, we tested their use in a microsuspension po-lymerization (Reaction 2) (22, 23). Micro-suspension and emulsion polymerizations, sma wma holt linear regression seasonalSpletKnown CO 2-triggered switchable materials now include solvents, surfactants, solutes, catalysts, particles, polymers, and gels. These have also been described as “smart” … high waisted velvet mini skirt