In this paper,recent researches on cellulose structure & hydrogen bonding,as well as some promising methods and theories of decrystallization,and applicational examples were described.

Moreover,XPS spectra indicate that,different from the relative content of chemical bonds,the chemical-bond type of cellulose macromolecules shows no obvious change after the decrystallization;and that the relative content changes of COH and COHO are highly related to the variation of crystalline index,with the correlation coefficients being 0.

According to the results of TEM, XRD, Ba/Ti (molar ratio) and specific surface area, the crystallization process of barium titanate followed the “dissolution-precipitation” mechanism in the hydrothermal synthesis with single water medium that contained a aggregation-growth.

At higher pH environment,amorphous precipitation may tend to dissolve-repreparation reaction,and make boehmite grains,and the crysta-llite state can improve by prolong aging time.

Through the analysis of phase and Mg content variation of samples obtained from different reac-tion system, we propose that the crystallization of calcium carbonate was mainly the aggregation-mediated process in the ethanol-water mixed solution and the solution-mediated process only in aqueous solution.