Journal: Chemistry of Materials

Article Title: Synthesis and Aqueous Solution Properties of Shape-Shifting Stimulus-Responsive Diblock Copolymer Nano-Objects

doi: 10.1021/acs.chemmater.1c02096

Figure Lengend Snippet: Figure 4. (a) Variation in z-average diameter (blue circles) and complex viscosity (red squares) with temperature for an aqueous dispersion of linear PNAEP85-PHBA295 nano-objects. DLS studies were conducted on 0.1% w/w aqueous dispersions, while rheological measurements were performed on a 10% w/w aqueous dispersion at an applied strain of 1.0% and an angular frequency of 1.0 rad s−1 during a run starting at 1 °C (15 min was allowed for thermal equilibration at this initial temperature prior to heating). (b) Prior to TEM analysis, 5% w/w aqueous dispersions of PNAEP85-PHBA295 nanoparticles were crosslinked with glutaraldehyde for 24 h at (i) 11 °C, (ii) 23 °C, (iii) 34 °C or (iv) 41 °C. (c) Small-angle X-ray scattering patterns recorded for a 1.0% w/w aqueous dispersion of linear thermoresponsive PNAEP85-PHBA295 nano-objects at 5 °C (black data), 23 °C (blue data), 34 °C (purple data) and 41 °C (red data; red triangle indicates the diffraction peak used to calculate D). The white lines indicate data fits obtained using appropriate scattering models (see the Supporting Information for further details).

Article Snippet: Alternatively, some SAXS experiments were conducted using a Xeuss 2.0 SAXS instrument (Xenocs) equipped with a FOX 3D multilayered X-ray mirror, two sets of scatterless slits for collimation, a hybrid pixel area detector (Pilatus 1M, Dectris), and a liquid gallium MetalJet X-ray source (Excillum, λ = 1.34 Å).

Techniques: Viscosity, Dispersion