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Séminaire : Kyubock Lee "Self-assembly of Amphiphilic Molecules for Rational Design of Various Nanomaterials" LRS

Self-assembly of Amphiphilic Molecules for Rational Design of Various Nanomaterials 
Kyubock Lee,

Location: Room 32-42 101 - Campus Jussieu
Time and date: February 18th, 2020 from 11h00 AM


In this talk, Kyubock Lee will introduce three different topics in different research fields, biomimetic CaCO3 mineralization, surface functionalization of magnetic nanoparticles for integrative downstream process of microalgal biofuel, and one-pot synthesis of heterogeneous catalyst, which have the common thread of self-assembly of amphiphilic molecules. The first topic is about a simple self-assembly route leading to a CaCO3 microlens array, somewhat reminiscent of the brittlestars’ microlenses, with uniform size and focal length, synthesized by using a minimum number of components and equipment at ambient conditions. The formation mechanism of the amorphous CaCO3 microlens arrays was elucidated by confocal Raman spectroscopic imaging to be a two-step growth process mediated by the organic surfactant. The second one is about surfactant-decorated Fe3O4 nanoparticles for microalgal harvesting and cell disruption. The major challenge in a microalgae-based biorefinery is the efficient separation of microalgae from low-concentration culture broth. The post-harvesting cell-disruption step is necessary to render microalgae suitable for lipid extraction. Moreover, further issues are high energy consumption and cost. We suggest herein a new scheme that integrates the critical downstream processes (harvesting and cell disruption) by means of cationic surfactant-decorated Fe3O4 nanoparticles. Lastly, I introduce the one-pot synthesis of mesoporous Ni-loaded alumina catalyst by aerosol-assisted evaporation induced self-assembly for dry reforming of methane. Here, to obtain ‘metal-in-mesopore’ structure by one-pot synthesis, meaning that Ni phase should be separated from alumina counterpart, hydrophobic nickel precursor was introduced with amphiphilic triblock copolymer as the structure directing agent. The catalytic activity of developed catalyst will be further discussed. Through this talk, I would like give an idea how the phenomena of self-assembly of amphiphilic molecules can be used for rational design of various nanomaterials.

References:

Crystal Research & Technology (2019) 1900002

Crystal Research & Technology (2019) 1900002

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Si vous souhaitez rencontrer M. Kyubock, par l'intermédiaire du contact au LRS

Marie Albéric (marie.alberic @ sorbonne-universite.fr)

20/01/20

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