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Experimental results show that the swelling stress of the ice destroys the original pore structure during the freezing process, causing the melting point of the pore ice to change, so the unfrozen water content during the melting process presents a hysteresis phenomenon. When phase equilibrium has been established in the freezing process, the unfrozen water is mainly the film water on the pore surface and pore water in pores with pore radius below 10\u00a0nm. At this time, the freezing point of the water in the system decreases exponentially as the temperature increases. The micropores of the coal samples from the Jiulishan Coalmine are well-developed, and the macropores and fractures are relatively small, with most pores having a pore radius between 0.1 and 10\u00a0nm. The pore water freezing point gradually decreases with the pore radius. When the pore radius decreases to 10\u00a0nm, the freezing point of pore water starts to decrease sharply with the decreasing pore radius. When the pore radius reaches 1.54\u00a0nm, the pore water freezing point changes as fast as 600 \u2103\/nm.<\/jats:p>","DOI":"10.1038\/s41598-021-94943-6","type":"journal-article","created":{"date-parts":[[2021,7,28]],"date-time":"2021-07-28T10:02:43Z","timestamp":1627466563000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Variation features of unfrozen water content of water-saturated coal under low freezing temperature"],"prefix":"10.1038","volume":"11","author":[{"given":"Bo","family":"Li","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laisheng","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoquan","family":"Lv","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongjie","family":"Ren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,7,28]]},"reference":[{"key":"94943_CR1","doi-asserted-by":"publisher","first-page":"4163","DOI":"10.1007\/s00603-020-02159-3","volume":"53","author":"A Liu","year":"2020","unstructured":"Liu, A., Liu, S., Wang, G. & Sang, G. 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