. Author manuscript; available in PMC: 2014 Oct 2.

Published in final edited form as: Lab Chip. 2014 Jan 7;14(1):106–117. doi: 10.1039/c3lc50618e

Table 1.

Surface characterization data for native, UV, and UV/thermal, planar PMMA and COC substrates

Substrate	Treatment	Water contact angle (°)	RMS roughness (nm)	COOH surface density (nmol cm⁻²)	O/C ratio	COOH C 1s (%)^a	FTIR peak area (a.u. cm⁻¹)
Substrate	Treatment	Water contact angle (°)	RMS roughness (nm)	COOH surface density (nmol cm⁻²)	O/C ratio	COOH C 1s (%)^a	C=O	O–H
PMMA	Native	76.4 ± 1.4	1.4	0.2 ± 0.1	0.32	0.0	21.4	3.1
	UV	36.7 ± 0.9	8.6	14.7 ± 2.6	0.38	1.9	25.2	13.9
	UV + 102 °C	63.9 ± 1.2	9.0	12.4 ± 1.8	0.32	1.0	24.8	8.5
COC	Native	95.5 ± 1.8	4.8	0.3 ± 0.2	0.01	0.0	0.0	0.0
	UV	43.1 ± 1.9	17.9	19.0 ± 2.9	0.27	8.9	11.2	13.4
	UV + 130 °C	80.0 ± 3.0	12.0	9.5 ± 2.3	0.10	3.0	10.5	7.8

% COOH of total C 1s signal.