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Chapter 6 – Production of Few Layer Graphene in Aqueous Media for Biological Studies Figure 6.13: Representative AFM images of G/HSA. a), d) and i) are height scans of G/HSA with average observed thickness. b and c) are corresponding amplitude and phase images of (a) showing HSA coverage on graphene surface. e and j) are corresponding phase images of (d) and (i) showing clear HSA adsorption at the edges. f and k) are enlarged phase images of HSA showing several individual ellipsoidal HSA molecules. Crystallographic studies have shown that HSA has a heart-shaped (Figure 6.12a) structure (approximated to an equilateral triangle of 8 × 8 nm dimension and ~3 nm height).402 The reported size of individual HSA molecule in PBS buffer (pH 7.4, 140 mM NaCl) determined by DLS is ~3.8 nm406, 407 and this is similar to the observed size of as- prepared, unsonicated HSA control (Figure 6.14a). This control, though, also contains some larger protein aggregates (~50 nm) due to the high concentration of HSA used (5 mg/ml). DLS on HSA controls that had be sonicated for 24 hr (Figure 6.14b) indicated individual HSA molecules, suggesting that such a long period of sonication did not damage the HSA completely. This sample, also contained large particles (> 200 nm), which could be attributed to the formation of aggregates, possibly sonication-induced amyloid like 185PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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