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Understanding the s...
Understanding the structure and dynamics of cationic surfactants from studies of pure solid phases
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- Cockcroft, Jeremy K. (författare)
- UCL, Christopher Ingold Labs, Dept Chem, 20 Gordon St, London WC1H 0AJ, England
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- Shamsabadi, Andre (författare)
- UCL, Christopher Ingold Labs, Dept Chem, 20 Gordon St, London WC1H 0AJ, England
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- Wu, Han (författare)
- UCL, Dept Chem Engn, Torrington Pl, London WC1E 7JE, England
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- Rennie, Adrian R., 1957- (författare)
- Uppsala universitet,Materialfysik
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(creator_code:org_t)
- 2019
- 2019
- Engelska.
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Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 21:47, s. 25945-25951
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://pubs.rsc.org...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- A homologous series of n-alkyl trimethylammonium bromide surfactants, H(CH2)(n)N+(CH3)(3) Br-, from C(10)TAB to C(18)TAB have been studied systematically in the bulk over a wide range of temperatures. Common features in the structures are identified, with packing dominated by the co-ordination of the cationic head groups with bromide anions and interdigitation of the hydrocarbon chains. This arrangement provides an explanation for the thin adsorbed bilayers that have been observed at various hydrophilic surfaces from aqueous solutions in previous studies. The molecular volumes and arrangement are comparable with structures of a number of different self-assembled amphiphiles. For these surfactants with bromide counter-ions, formation of crystal hydrates was not observed. The alkyl chains are highly mobile and at high temperatures a plastic phase is found for all materials with a transition enthalpy that is similar to the melting enthalpy of many long alkyl chains. Other unexpected phase transitions depend more markedly on the hydrocarbon chain length and evidently depend on delicate balances of the various contributions to the free energy.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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