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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Liu, R.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Influence of grain size and crystallographic orientation on microbially influenced corrosion of low-carbon steel in artificial seawater
- 2022Synthesis of a mesoscale ordered 2D-conjugated polymer with semiconducting propertiescitations
- 2020Systematic study of shockley-read-hall and radiative recombination in GaN on Al<sub>2</sub>O<sub>3</sub>, freestanding GaN, and GaN on Sicitations
- 2016FORMATION OF SUPERCONDUCTING (TI,BI)SR2CACU2OY THIN-FILMS BY RF-SPUTTERING AND THALLIUM DIFFUSIONcitations
- 2016Hole states in fluorine-doped La2CuO4 thin films probed by polarized x-ray-absorption spectroscopycitations
- 2016FURTHER MEASUREMENTS ON THE TL0.5PB0.5SR2(CA1-YYY)CU2O7-DELTA SYSTEM PB NMR AND MAGNETIC-SUSCEPTIBILITYcitations
- 2016ELECTRICAL AND MAGNETIC-PROPERTIES OF THE TL-SR-V-O SYSTEMcitations
- 2016PREPARATION AND CHARACTERIZATION OF TL2BA2CACU2O8 THIN-FILMS BY LASER ABLATION AND THALLIUM DIFFUSIONcitations
- 2016FERRIMAGNETISM IN THE TI-SR-V-O SYSTEMcitations
- 2009Temperature-triggered gelation of aqueous laponite dispersions containing a cationic poly(n-isopropyl acrylamide) graft copolymercitations
- 2006Misfit dislocation generation in InGaN epilayers on free-standing GaNcitations
- 2003Distinct magnesium incorporation behavior in laterally grown GaN and AlGaN
- 2003Distinct magnesium incorporation behavior in laterally grown AlGaN
- 2003The nature of magnesium precipitation in GaN and AlGaN deposited by epitaxial lateral overgrowth
Places of action
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article
Temperature-triggered gelation of aqueous laponite dispersions containing a cationic poly(n-isopropyl acrylamide) graft copolymer
Abstract
In this work, temperature-triggered gelation of aqueous laponite dispersions containing a cationic poly(N- isopropylacrylamide) (PNIPAm) graft copolymer was investigated. The copolymer used was PDMA+ 30-g-(PNIPAm210)14 [Liu et al. Langmuir 2008, 24, 7099]. DMA+ is quarternarized N,N-dimethylaminoethyl methacrylate. The presence of small concentrations of laponite enabled temperature-triggered gel formation to occur at low copolymer concentrations (e.g., 1 wt %). Dynamic Theological measurements of the gels showed that they had storage modulus values of up to 400 Pa when the total solid volume fraction (polymer and laponite) was only about 0.02. The storage modulus was dependent on both the temperature and the composition of the dispersion used for preparation. The key component that provided the temperature-triggered gels with their elasticity was found to be self-assembled nanocomposite (NC) sheets. These NC sheets spontaneously formed at room temperature upon addition of laponite to the copolymer solution. The NC sheets had lateral dimensions on the order of hundreds of micrometers and a thickness of a few micrometers. The NC sheets were present within the temperature-triggered gels and formed elastically effective chains. The NC sheets exhibited temperature-triggered contraction with a contraction onset temperature of 27 deg;C. A conceptual model is proposed to qualitatively explain the relationship between gel elasticity and dispersion composition. © 2009 American Chemical Society.