Stability of a pH-sensitive polymer matrix

Conference · Thu Mar 01 04:00:00 EST 1990

OSTI ID:6950711

Northrup, M A; Langry, K; Angel, S M

A ratiometric pH-sensitive fluorescent dye (hydroxypyrenetrisulfonic acid) was covalently attached to an acrylamide polymer. These pH-sensitive copolymers were either covalently bonded to the end of an optical fiber or polymerized into separate gels. Long-term, accelerated aging studies were performed on the fibers and gels in 43{degree}C distilled H{sub 2}O. The fiber-immobilized optrodes gave good pH responses for up to 2 months. The pH-sensitive gels were physically attached to optical fibers and gave very good pH responses for over one year. These physically immobilized, one-year-old, pH-sensitive copolymers provided optrodes with linear pH responses between pH 6 and 8 and resolution greater than 0.25 pH unit. A simple photostability experiment on these optrodes showed that they were very photostable. The results of this study indicate that pH-sensitive copolymers in a simple optrode design can be employed as pH sensors with useful lifetimes exceeding one year. 11 refs., 6 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6950711
• Report Number(s): UCRL-JC-103167; CONF-900140--19; ON: DE90009579
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
440600 -- Optical Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ABSORPTION SPECTRA
AGING
COLLOIDS
DISPERSIONS
DYES
FIBER OPTICS
FIBERS
FLUORESCENCE
GELS
LUMINESCENCE
MEASURING METHODS
OPTICAL FIBERS
PH VALUE
POLYMERS
SPECTRA