Cellulose frameworks have emerged as promising materials for light management due to their exceptional light-scattering capabilities and sustainable nature.Conventional biomass-derived cellulose frameworks face a fund...Cellulose frameworks have emerged as promising materials for light management due to their exceptional light-scattering capabilities and sustainable nature.Conventional biomass-derived cellulose frameworks face a fundamental trade-off between haze and transparency,coupled with impractical thicknesses(≥1 mm).Inspired by squid’s skin-peeling mechanism,this work develops a peroxyformic acid(HCOOOH)-enabled precision peeling strategy to isolate intact 10-μm-thick bamboo green(BG)frameworks—100×thinner than wood-based counterparts while achieving an unprecedented optical performance(88%haze with 80%transparency).This performance surpasses delignified biomass(transparency<40%at 1 mm)and matches engineered cellulose composites,yet requires no energy-intensive nanofibrillation.The preserved native cellulose I crystalline structure(64.76%crystallinity)and wax-coated uniaxial fibril alignment(Hermans factor:0.23)contribute to high mechanical strength(903 MPa modulus)and broadband light scattering.As a light-management layer in polycrystalline silicon solar cells,the BG framework boosts photoelectric conversion efficiency by 0.41%absolute(18.74%→19.15%),outperforming synthetic anti-reflective coatings.The work establishes a scalable,waste-to-wealth route for optical-grade cellulose materials in next-generation optoelectronics.展开更多
以壳聚糖季铵盐(HACC)为功能单体,丙烯酸、丙烯酸丁酯、丙烯酸异辛酯为软单体,甲基丙烯酸甲酯为硬单体,采用半连续种子预乳液法,制备了壳聚糖季铵盐基丙烯酸酯无氟防油剂(HACC-A)。将HACC-A与烷基烯酮二聚体(AKD)复配涂布构建了防水防油...以壳聚糖季铵盐(HACC)为功能单体,丙烯酸、丙烯酸丁酯、丙烯酸异辛酯为软单体,甲基丙烯酸甲酯为硬单体,采用半连续种子预乳液法,制备了壳聚糖季铵盐基丙烯酸酯无氟防油剂(HACC-A)。将HACC-A与烷基烯酮二聚体(AKD)复配涂布构建了防水防油AKD-HACC-A涂布纸。考察了反应条件对HACC-A粒径分布和贮存稳定性的影响,探讨了HACC-A涂布量、m(HACC-A)∶m(AKD)对涂布纸的60 s Cobb值、Kit防油等级的影响。采用FTIR、TGA、SEM、EDS对样品进行了表征,并测试了纸张性能。结果表明,在质量分数5%(以单体总质量计,下同)的OP-10为乳化剂、反应温度70℃、过硫酸铵(APS)用量0.8%(以单体总质量计,下同)、反应时间2 h的最优条件下,制备的HACC-A乳液粒径为200~400 nm,分布较窄,蓝光明显,可长时间(60 d)稳定储存;当HACC用量为5 g、HACC-A涂布量为6 g/m^(2)时,HACC-A涂布后的纸张60 s Cobb值为54 g/m^(2),Kit防油等级为6级,满足食品包装标准;当m(HACC-A)∶m(AKD)=1∶1、涂布量为6 g/m^(2)时,AKD-HACC-A涂布纸60 s Cobb值为30 g/m^(2),Kit防油等级为10级,对常见油脂(常温和105℃的食用油及辣椒油)、有机溶剂(乙醇和丙酮)和碱性溶液(盐酸和NaOH溶液)表现出良好的阻隔性能,防油性能优于聚乙烯淋膜纸,接近含氟防油纸的防油性能。展开更多
基金supported by National Natural Science Foundation of China(32494793).
文摘Cellulose frameworks have emerged as promising materials for light management due to their exceptional light-scattering capabilities and sustainable nature.Conventional biomass-derived cellulose frameworks face a fundamental trade-off between haze and transparency,coupled with impractical thicknesses(≥1 mm).Inspired by squid’s skin-peeling mechanism,this work develops a peroxyformic acid(HCOOOH)-enabled precision peeling strategy to isolate intact 10-μm-thick bamboo green(BG)frameworks—100×thinner than wood-based counterparts while achieving an unprecedented optical performance(88%haze with 80%transparency).This performance surpasses delignified biomass(transparency<40%at 1 mm)and matches engineered cellulose composites,yet requires no energy-intensive nanofibrillation.The preserved native cellulose I crystalline structure(64.76%crystallinity)and wax-coated uniaxial fibril alignment(Hermans factor:0.23)contribute to high mechanical strength(903 MPa modulus)and broadband light scattering.As a light-management layer in polycrystalline silicon solar cells,the BG framework boosts photoelectric conversion efficiency by 0.41%absolute(18.74%→19.15%),outperforming synthetic anti-reflective coatings.The work establishes a scalable,waste-to-wealth route for optical-grade cellulose materials in next-generation optoelectronics.
文摘以壳聚糖季铵盐(HACC)为功能单体,丙烯酸、丙烯酸丁酯、丙烯酸异辛酯为软单体,甲基丙烯酸甲酯为硬单体,采用半连续种子预乳液法,制备了壳聚糖季铵盐基丙烯酸酯无氟防油剂(HACC-A)。将HACC-A与烷基烯酮二聚体(AKD)复配涂布构建了防水防油AKD-HACC-A涂布纸。考察了反应条件对HACC-A粒径分布和贮存稳定性的影响,探讨了HACC-A涂布量、m(HACC-A)∶m(AKD)对涂布纸的60 s Cobb值、Kit防油等级的影响。采用FTIR、TGA、SEM、EDS对样品进行了表征,并测试了纸张性能。结果表明,在质量分数5%(以单体总质量计,下同)的OP-10为乳化剂、反应温度70℃、过硫酸铵(APS)用量0.8%(以单体总质量计,下同)、反应时间2 h的最优条件下,制备的HACC-A乳液粒径为200~400 nm,分布较窄,蓝光明显,可长时间(60 d)稳定储存;当HACC用量为5 g、HACC-A涂布量为6 g/m^(2)时,HACC-A涂布后的纸张60 s Cobb值为54 g/m^(2),Kit防油等级为6级,满足食品包装标准;当m(HACC-A)∶m(AKD)=1∶1、涂布量为6 g/m^(2)时,AKD-HACC-A涂布纸60 s Cobb值为30 g/m^(2),Kit防油等级为10级,对常见油脂(常温和105℃的食用油及辣椒油)、有机溶剂(乙醇和丙酮)和碱性溶液(盐酸和NaOH溶液)表现出良好的阻隔性能,防油性能优于聚乙烯淋膜纸,接近含氟防油纸的防油性能。
