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| Home > Publications database > Structure and Dynamics of Complex Liquids - The Phase Behaviour of Silica-PNIPAm Nanogels > print |
| 001 | 429201 | ||
| 005 | 20211110155309.0 | ||
| 024 | 7 | _ | |a 10.3204/PUBDB-2019-04870 |2 datacite_doi |
| 037 | _ | _ | |a PUBDB-2019-04870 |
| 088 | 1 | _ | |a DESY-THESIS-2019-032 |
| 088 | _ | _ | |a DESY-THESIS-2019-032 |2 DESY |
| 100 | 1 | _ | |a Frenzel, Lara |0 P:(DE-H253)PIP1023108 |b 0 |e Corresponding author |g female |
| 245 | _ | _ | |a Structure and Dynamics of Complex Liquids - The Phase Behaviour of Silica-PNIPAm Nanogels |f 2015-09-16 - 2019-10-18 |
| 260 | _ | _ | |a Hamburg |c 2019 |b Verlag Deutsches Elektronen-Synchrotron |
| 300 | _ | _ | |a 101 |
| 336 | 7 | _ | |a Output Types/Dissertation |2 DataCite |
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| 336 | 7 | _ | |a DISSERTATION |2 ORCID |
| 336 | 7 | _ | |a PHDTHESIS |2 BibTeX |
| 336 | 7 | _ | |a Thesis |0 2 |2 EndNote |
| 336 | 7 | _ | |a Report |0 PUB:(DE-HGF)29 |2 PUB:(DE-HGF) |m report |
| 336 | 7 | _ | |a Dissertation / PhD Thesis |b phd |m phd |0 PUB:(DE-HGF)11 |s 1576753524_6997 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a doctoralThesis |2 DRIVER |
| 490 | 0 | _ | |a DESY-THESIS |
| 502 | _ | _ | |a Dissertation, Universität Hamburg, 2019 |c Universität Hamburg |b Dissertation |d 2019 |
| 520 | _ | _ | |a In this thesis, the structure and dynamics of highly concentrated core-shell nanogel particlescomposed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell suspendedin water are studied. The particles were synthesised with dierent core-to-shell size ratiosand prepared at various concentrations with volume fractions e between approximately0:004 and 2. X-ray photon correlation spectroscopy (XPCS) enables to follow the dynamical,small-angle X-ray scattering (SAXS) the structural changes of the thermo-responsivenanogel particles which undergo a volume phase transition at a so-called lower criticalsolution temperature (LCST) of 32C. All samples were studied in a broad temperaturerange around the LCST with approximately 15C < T < 45C and the main focus is ondensely-packed systems.For a system with e = 0:55, the structural relaxation time c was found to decreasewith increasing temperature. Above the LCST, the structural relaxation time initiallycontinues to decrease. The eect is accompanied by a transition from stretched to compressedexponential behaviour of the intensity autocorrelation functions, which could bedetermined by analysing the intensity autocorrelation functions. Upon further heating asudden slowing down at a critical temperature Tc 37C. In parallel, the q-dependenceof the relaxation time shows an anomalous change from c / q3 to c / q1. Theresults reveal a temperature-induced transition from swollen repulsive particles with polymerdriven dynamics at lower temperatures T < Tc towards a colloidal gel composed ofcollapsed attractive particles. The transition of structure and dynamics shows a distinctdependency on the eective particle volume fraction. Below a critical concentration notransition upon heating was found.The de-swelling behaviour of the PNIPam nanogel was inuenced with the additionof Trimethylamine N-oxide (TMAO) to the concentrated particle suspension. With increasingTMAO concentration, a shift of the LCST towards lower temperatures and apreferential hydrophobic state could be determined.With all results a full phase diagram of a silica-PNIPAm core-shell system is presentedas a function of temperature and concentration. It spans from dilute suspensions toan eective volume fraction of more than ninety percent covering two liquid phases, astructural rearrangement phase and a colloidal gel phase. |
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| 700 | 1 | _ | |a Lehmkühler, Felix |0 P:(DE-H253)PIP1008819 |b 1 |e Thesis advisor |
| 700 | 1 | _ | |a Gruebel, Gerhard |0 P:(DE-H253)PIP1000392 |b 2 |e Thesis advisor |
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