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. Author manuscript; available in PMC: 2014 Aug 19.
Published in final edited form as: Colloids Surf B Biointerfaces. 1994 Sep 30;3(1-2):49–62. doi: 10.1016/0927-7765(93)01114-7

Table 2.

Reaction conditions and –CO–/–CH2– ratio for PEG2000– and PEG5000– silica surfaces as determined from the respective areas of the deconvoluted C1s XPS spectra

Reaction conditions
XPS intensity ratio –CO–/–CH2–
T (°C) Time (h) pH K2SO4 concentration (%)
60 40 5.2 11 1.1a
60 40 5.2 11 8.6b
60 40 5.2 11 10.4c
60 40 7.2 11 0b
60 40 9.2 11 0b
a

PEG2000, the NaCNBH3 reduction step omitted.

b

PEG2000 with the NaCNBH3 reduction step.

c

PEG5000 with the NaCNBH3 reduction step.