This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1021/acsmacrolett.7b00563 in citations.
Pressure-Dependence of Poly( N -isopropylacrylamide) Mesoglobule Formation in Aqueous Solution
Pressure-Dependence of Poly( N -isopropylacrylamide) Mesoglobule Formation in Aqueous Solution
Above their cloud point, aqueous solutions of the thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM) form large mesoglobules. We have carried out very small-angle neutron scattering (VSANS with q = 0.21–2.3 × 10–3 Å–1) and Raman spectroscopy experiments on a 3 wt % PNIPAM solution in D2O...
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Personal Name(s): | Niebuur, Bart-Jan |
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Claude, Kora-Lee / Pinzek, Simon / Cariker, Coleman / Raftopoulos, Konstantinos N. / Pipich, Vitaliy / Appavou, Marie-Sousai / Schulte, Alfons (Corresponding author) / Papadakis, Christine M. (Corresponding author) | |
Contributing Institute: |
Neutronenstreuung; JCNS-1 JCNS-FRM-II; JCNS-FRM-II |
Published in: | ACS Macro Letters, 6 (2017) 11, S. 1180 - 1185 |
Imprint: |
Washington, DC
ACS
2017
|
DOI: |
10.1021/acsmacrolett.7b00563 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) Soft Matter, Health and Life Sciences |
Subject (ZB): | |
Publikationsportal JuSER |
Above their cloud point, aqueous solutions of the thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM) form large mesoglobules. We have carried out very small-angle neutron scattering (VSANS with q = 0.21–2.3 × 10–3 Å–1) and Raman spectroscopy experiments on a 3 wt % PNIPAM solution in D2O at atmospheric and elevated pressures (up to 113 MPa). Raman spectroscopy reveals that, at high pressure, the polymer is less dehydrated upon crossing the cloud point. VSANS shows that the mesoglobules are significantly larger and contain more D2O than at atmospheric pressure. We conclude that the size of the mesoglobules and thus their growth process are closely related to the hydration state of PNIPAM. |