Elucidating the effect of growth periods on the quality of calcium sulfate whiskers(CSWs)prepared from calcium sulfate dihydrate(DH)is imperative.Herein,crystal seeds and whiskers were prepared from DH in a water–gly...Elucidating the effect of growth periods on the quality of calcium sulfate whiskers(CSWs)prepared from calcium sulfate dihydrate(DH)is imperative.Herein,crystal seeds and whiskers were prepared from DH in a water–glycerol system.Longer whiskers were obtained from crystal seeds prepared via hydration of DH for 30 s than via ball milling for 5 min followed by hydration for 20 s.The attachment of cetyltrimethyl ammonium bromide and glycerol additives to the whisker tops promoted whisker growth.The whisker sponges exhibited good thermal barrier properties and compression cycle stability.展开更多
Extraction of hemicelluloses is a primary step in the conversion of plant biomass to valuable biofuels and chemicals.Hemicellulose is distributed in the fiber cell wall,and the compact structure of the fiber cell wall...Extraction of hemicelluloses is a primary step in the conversion of plant biomass to valuable biofuels and chemicals.Hemicellulose is distributed in the fiber cell wall,and the compact structure of the fiber cell wall barricades the transport of hemicelluloses in the extraction process.In this paper we presented a novel microwave-assisted extraction process enhanced with an enzymatic pretreatment to improve the hemicelluloses extraction rate from bagasse.Experimental results showed that the enzyme dosage,alkali concentration and microwave irradiation time were main factors governing the yield of hemicellulose.The optimal conditions of the enzymatic pretreatment were:enzyme dosage of 138 IU/g bagasse and irradiation time of 30 min.Under these conditions,86%of the hemicellulose in bagasse was extracted.After the enzymatic pretreatment the surface area of bagasse increased significantly which facilitated the subsequent microwave-assisted extraction process.展开更多
基金supported by the Degradable Plastics Engineering Research Center of Yunnan Provincial Education Department(KKPU202205001).
文摘Elucidating the effect of growth periods on the quality of calcium sulfate whiskers(CSWs)prepared from calcium sulfate dihydrate(DH)is imperative.Herein,crystal seeds and whiskers were prepared from DH in a water–glycerol system.Longer whiskers were obtained from crystal seeds prepared via hydration of DH for 30 s than via ball milling for 5 min followed by hydration for 20 s.The attachment of cetyltrimethyl ammonium bromide and glycerol additives to the whisker tops promoted whisker growth.The whisker sponges exhibited good thermal barrier properties and compression cycle stability.
基金supported by the National Natural Science Foundation of China (Grant No.31460176,21466017)the Opening Project of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control (Grant No.ZR201606).
文摘Extraction of hemicelluloses is a primary step in the conversion of plant biomass to valuable biofuels and chemicals.Hemicellulose is distributed in the fiber cell wall,and the compact structure of the fiber cell wall barricades the transport of hemicelluloses in the extraction process.In this paper we presented a novel microwave-assisted extraction process enhanced with an enzymatic pretreatment to improve the hemicelluloses extraction rate from bagasse.Experimental results showed that the enzyme dosage,alkali concentration and microwave irradiation time were main factors governing the yield of hemicellulose.The optimal conditions of the enzymatic pretreatment were:enzyme dosage of 138 IU/g bagasse and irradiation time of 30 min.Under these conditions,86%of the hemicellulose in bagasse was extracted.After the enzymatic pretreatment the surface area of bagasse increased significantly which facilitated the subsequent microwave-assisted extraction process.
