What is it about?
This paper describes how water sorption in wood behaves under designed relative humidity (or relative pressure) loops. Different from usual approach, we designed the relative humidity cycles systematically. This leads to the finding of five different sorption isotherm patterns (or hysteresis patterns). These patterns are consistent for three different wood species at two temperature levels. We further interpreted the connection of hysteresis patterns, wood nanoscale structure, and hysteresis origin.
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Why is it important?
The experimental sorption hysteresis patterns we identified revealed very interesting geometric properties, which suggest the INDEPENDENT cell wall pore structure of wood. Since there is no need to consider hysteresis caused by connection of pores, this finding greatly facilitates further explanation of the origin of Hysteresis.
Perspectives
These experimental hysteresis patterns are so beautiful! They fit the theoretical ones for simple nonswelling materials so well. Since wood swells as much as 12% of its original volume, I would expect more deviation. I cannot explain what is going on here, but they give me enough evidence and confidence to continue study on the origin of hysteresis in wood.
Jingbo Shi
Read the Original
This page is a summary of: Water sorption hysteresis in wood: I review and experimental patterns – geometric characteristics of scanning curves, Holzforschung, January 2017, De Gruyter,
DOI: 10.1515/hf-2016-0120.
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