Apparent activation energy of fused silica optical fibers in static fatigue in aqueous environments |
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| Affiliation: | 1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Shenyang, 110819, China;2. School of Metallurgy, Northeastern University, Shenyang, 110819, China;1. Department of Applied Chemistry, School of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan;2. Environmental Research Laboratory, Kinki University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan;3. Department of Chemistry, School of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan;1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Shenyang, 110819, China;2. School of Metallurgy, Northeastern University, Shenyang, 110819, China;1. NASA Glenn Research Center, Cleveland, OH 44135, United States;2. University of Utah, Salt Lake City, UT 84112, United States;3. East Central University, Ada, OK 74820, United States;1. Nano Materials and Device Laboratory, Department of Applied Physics, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur, 440010, MS, India;2. Department of Physics, School of Physical Sciences, North Maharashtra University, Jalgaon, 425001, MS, India |
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| Abstract: | Static fatigue of fused silica optical fiber is known to be caused by stress assisted reaction of silica with ambient moisture. Past studies have often been conducted in hot water to accelerate experiments compared with cooler vapor environment. However, changes in the pH of water with temperature has an important influence on the fatigue rate, but has been ignored in the literature. To study the effect of pH, static fatigue of fused silica fibers has been characterized over a range of temperatures in both distilled water and pH 7 buffer solution. The apparent activation energies were then obtained for the different environments. The silica fibers were found to fatigue faster in pH 7 buffer solution than in distilled water, and the apparent activation energy for fatigue was higher in pH 7 buffer. The difference in the results for the two environments can be understood in terms of the difference in their pH and how the pH varies with temperature. |
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