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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b03233
|2 doi
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|a pubmed24n0968.xml
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|a eng
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| 100 |
1 |
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|a Anyfantakis, Manos
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Adsorption and Crystallization of Particles at the Air-Water Interface Induced by Minute Amounts of Surfactant
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a Date Completed 06.02.2019
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|a Date Revised 15.02.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Controlling the organization of particles at liquid-gas interfaces usually relies on multiphasic preparations and external applied forces. Here, we show that micromolar amounts of a conventional cationic surfactant induce, in a single step, both adsorption and crystallization of various types of nanometer- to micrometer-sized anionic particles at the air-water interface, without any additional phase involved or external forces other than gravity. Contrary to conventional surfactant-induced particle adsorption through neutralization and hydrophobization at a surfactant concentration close to the critical micellar concentration (CMC), we show that in our explored concentration regime (CMC/1000-CMC/100), particles adsorb with a low contact angle and maintain most of their charge, leading to the formation of two-dimensional assemblies with different structures, depending on surfactant ( Cs) and particle ( Cp) concentrations. At low Cs and Cp, particles are repulsive and form disordered assemblies. Increasing Cp in this regime increases the number of adsorbed particles, leading to the formation of mm-sized, highly ordered polycrystalline assemblies because of the long-range attraction mediated by the collective deformation of the interface. Increasing Cs decreases the particle repulsion and therefore the interparticle distance within the monocrystalline domains. A further increase in Cs (≈CMC/10) leads to a progressive neutralization of particles accompanied by the formation of disordered structures, ranging from densely packed amorphous ones to loosely packed gels. These results emphasize a new role of the surfactant to mediate both adsorption and crystallization of particles at liquid-gas interfaces and provide a practical manner to prepare two-dimensional ordered colloidal assemblies in a remarkably robust and convenient manner
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Vialetto, Jacopo
|e verfasserin
|4 aut
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|a Best, Andreas
|e verfasserin
|4 aut
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| 700 |
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|a Auernhammer, Günter K
|e verfasserin
|4 aut
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|a Butt, Hans-Jürgen
|e verfasserin
|4 aut
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|a Binks, Bernard P
|e verfasserin
|4 aut
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| 700 |
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|a Baigl, Damien
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 34(2018), 50 vom: 18. Dez., Seite 15526-15536
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|g volume:34
|g year:2018
|g number:50
|g day:18
|g month:12
|g pages:15526-15536
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|u http://dx.doi.org/10.1021/acs.langmuir.8b03233
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