Additional file 1.

Supplementary information of a colorimetric method for the molecular weight determination of polyethylene glycol. Correlation between 〈h21/2 and Mw of PEG (Figure S1). TEM images of as-prepared AuNPs (Figure S2). Plot of energy vs interparticular distance (H) for steric stabilization (Figure S3). Normalized absorption spectra of PEG (SPEG 1,450 to 10,000)-coated AuNPs in the presence of 10.0% (w/v) NaCl solution (Figure S4). Calculation of surface area of 16-nm AuNP availability for PEG adsorption (Table S1). Calculation of surface area of 26-nm AuNP availability for PEG adsorption (Table S2).

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Ling et al. Nanoscale Research Letters 2013 8:538   doi:10.1186/1556-276X-8-538