Chemists have developed a new sensor that is capable of measuring pH in a microvolume of liquid with unprecedented accuracy. The new sensor is a solid-state device that works at the nanoscale and can measure pH in a liquid sample as small as 10 picoliters with an accuracy of +/- 0.01 pH units. This is a major advancement for researchers who study samples that are too small for traditional pH sensors.

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source: Phys.org