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(10) Production(s) de CORS M.
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Linear thermoresponsive acrylamid based microgels adsorbed on a surface 
Auteur(s): Cors M. , Hellweg Thomas, Oberdisse J.
Conference: DPG Fruehjahrstagung Dresden (Hydrogels and microgels) (Dresden, DE, 2017-03-19)
Ref HAL: hal-01922426_v1
Exporter : BibTex | endNote
Résumé: A gel is a dispersed system which consists of at least two different components: a solid or flexible mesh and a fluid. If the fluid is water the gel is called a hydrogel. Microgels are gels smaller than 10 μm and can be used in a wide range of applications like drug delivery and smart surface coatings. If the microgel consists of acrylamides like N-isopropylmethacrylamide (NIPMAM) or N-n-propylacrylamid (NNPAM) as network component, they show a volume phase transition (VPT) at a certain temperature, the volume phase transition temperature (VPTT). An increase in temperature above the VPTT leads to an abrupt decrease in size and a decrease in temperature leads to an abrupt increase in size. The VPTT is specific for each monomer. To use microgels in sensors or for nanoactuators the thermoresponse has to be precise and well known. That is why we investigated microgels with a complex architecture containing NIPMAM and NNPAM. These particles show a tunable linear change in size between the two VPTTs of NNPAM (22 °C) and NIPMAM (43 °C). Furthermore, we deposited these microgels on surfaces and investigated the properties of the microgel coating. The properties of these particles (like phase transition behavior or particle size) can be adjusted by selecting specific synthesis conditions.
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Core-Shell Microgel-Based Surface Coatings with Linear Thermoresponse
Auteur(s): Cors M., Wrede Oliver, Genix A.-C., Anselmetti Dario, Oberdisse J., Hellweg Thomas
(Article) Publié:
Langmuir, vol. 33 p.6804-6811 (2017)
Texte intégral en Openaccess : 
Ref HAL: hal-01580200_v2
Ref Arxiv: 1811.08753
DOI: 10.1021/acs.langmuir.7b01199
WoS: WOS:000405536100019
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
28 Citations
Résumé: We study the swelling and shrinking behavior of core-shell microgels adsorbed on silicon wafers. In these systems, the core is made of cross-linked poly(N isopropylmethacrylamide) and the shell consists of cross linked poly(N-n propylacrylamide). In suspension, these particles exhibit an extended linear swelling behavior in the temperature interval between the lower critical solution temperatures of the two polymers. Using ellipsometry and AFM, we show that this linear response is also observed in the adsorbed state.
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