Temperature dependence of two or more water species in delignified wood and lignocellulosic,tracked by LFNMR relaxometryOA
Distributions of nuclear magnetic resonance(NMR)relaxation times provide detailed information about the water in wood.This study documents the water dynamics analysis of T_(2)and T_(1)distributions for saturated delignified sapwood(DSW),delignified heartwood(DHW)and lignocellulose(LC)samples at different temperatures.Results indicate that below the freezing point of bulk water,free water freezes,causing its signal to disappear from the distribution.Then,the low temperature distributions of the unfrozen bound water contain more information about its components,with DSW,DHW and LC containing two distinct states of bound water(OH bound water(B-water)and more freely bound water(C-water)).Furthermore,it was observed that within the temperature range of−3°C to−60°C,B-water in DSW,DHW and LC maintained a higher unfrozen water content(UWC)value than C-water,and the T_(1)/T_(2)ratios for B-water were consistently higher than that for C-water,indicating that B-water has a greater antifreeze capacity.T_(2)and T_(1)distributions offer different kinds of information about water components,and all peaks within the distribution have been assigned.
Long Zhou;Wenjing Liu;Zhihong Zhao;Rui Tan;Xiaofeng Zhu;Shen Wang;Zonghai Harry Xie;Minghui Zhang
College of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,ChinaCollege of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,ChinaCollege of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,ChinaCollege of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,ChinaCollege of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,ChinaCollege of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,ChinaCore Laboratories,Houston,TX 77040,USACollege of Materials Science and Art Design,Inner Mongolia Agricultural University,Hohhot,010018,China
农业科技
Low-field nuclear magnetic resonance(LFNMR)Delignified wood and lignocellulosicWater speciesRelaxation characteristicsBound waterTemperature dependence
《Magnetic Resonance Letters》 2026 (1)
P.13-24,12
supported by Natural Science Foundation of Inner Mongolia Autonomous Region of China(2023MS03027)the National Natural Science Foundation of China(31860185 and 31160141).We would also like to express our gratitude for the valuable suggestions provided by the reviewers and the strong support from the editorial team of Magnetic Resonance Letters.
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