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. Author manuscript; available in PMC: 2017 Jun 13.
Published in final edited form as: ACS Biomater Sci Eng. 2016 May 9;2(6):963–976. doi: 10.1021/acsbiomaterials.6b00052

Figure 1. Assessment of structure-activity relationships for MWCNTs modified by acid oxidation and coating with various surfactants.

Figure 1

A) Acid oxidized MWCNTs dispersed in surfactants were infused at a rate of 0.2 μL/min via a catheter inserted 15 mm below the surface of a 0.6% agarose brain-mimicking hydrogels using a micromanipulator to place the catheter and an infusion pump to regulate flow as shown. B) Representative images illustrating the effect of the coatings on the distribution of the MWCNTs in the hydrogels after infusion of MWCNT dispersions are shown as follows: 1) Uncoated; 2) 1% Pluronic; 3) 1% DSPE-PEG; 4) 2% DSPE-PEG. The depth at which the catheter was placed is indicated by the dashed line. C) Hydrogels infused with MWCNTs were bisected alone the midline and photographed as shown on the left in each panel. The two halves were place back together and transverse sections were made at the points indicated by the white dashed lines. An image of each transverse section is shown on the right of each panel. D) Increasing concentrations of MWCNTs dispersed in surfactants were exposed to a 970 nm diode laser at 3 W/cm2 for 30 seconds. Temperatures of the MWCNT suspensions were determined via thermocouple immediately after laser exposure.