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31.
An aerogel electrode composed of conductive active materials based on nanocellulose aerogels can absorb more electrolytes, as well as enhance electron transport and ion diffusion channels. In the present study, aerogels with high strength were successfully prepared using 2,2,6,6-tetramethyl-1-piperidinyloxy free radical (TEMPO)-oxidized cellulose nanofibrils (CNF) as a raw material and polyethyleneimine (PEI) as a cross-linking agent. Simultaneously, functional electrode materials were prepared via self-assembly. Based on our findings, PEI can significantly improve the water and solvent solubility and enhance the wet strength and shape recovery ability of CNF aerogels. Meanwhile, the minimum density of the aerogel reached 0.0160 g/cm3, the maximum porosity was approximately 98.5%, and the maximum stress approximated 0.02 MPa. Furthermore, electrochemical tests revealed that after self-assembly of reduced graphene oxide (RGO) and polyaniline (PANI) solution, the mass specific capacitance of the functional composite aerogel was approximately 92 F/g and exhibited good charge-discharge performance. 相似文献
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Well-dispersed fiber suspension is the precondition of good paper formation. Compared with cellulosic fibers, synthetic fibers are prone to flocculate because of their long length and hydrophobic nature, resulting in poor paper formation. To solve this problem, dispersants and extremely low forming consistency are typically adopted during the traditional wet-forming process, which cause a large amount of water consumption and treatment cost. Therefore, increasing forming consistency without compromising paper formation remains a challenge for papermakers. In this work, foam forming was adopted to disperse polyimide fibers (PI) with high forming consistency. The results showed that the formation index of handsheets increased when the bubble size and distribution became small and narrow. Compared with traditional wet-forming process with the same consistency (0.4%), the formation index of handsheets by foam forming increased by approximately 100% when C8 alkyl glucoside (APG08) concentration reached 16 g/L. Notably, forming consistency could increase by eight times while keeping the same level of paper formation. Overall, foam forming exhibits great advantages in dispersing long fiber and reducing water consumption and environmental pressure, and has potential applications in specialty paper made of long fibers. 相似文献
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Sufeng Zhang Ning Wei Zijie Yao Xinyu Zhao Min Du Qiusheng Zhou 《International Journal of Hydrogen Energy》2021,46(7):5286-5295
Enhancing the catalytic activity of Co3O4 electrocatalysts featuring abundant oxygen vacancies is required to enable their application in oxygen evolution reaction (OER). However, developing a harmless defect engineering strategy based on mild conditions to realize such an enhancement remains a challenge. Here, ultrathin Co3O4 nanosheets with abundant oxygen vacancies were prepared through a simple two-step method comprising a hydrothermal process and pre-oxidation to study the catalytic activity of the nanosheets toward OER. The ultrathin sheet structure and the Co3O4 nanosheets surface provide abundant active sites. The oxygen vacancy not only improves the catalyst activity, but also improves the electron transfer efficiency. These advantages make ultrathin Co3O4 nanosheets with abundant oxygen vacancies an excellent electrocatalyst for oxygen evolution. In an alkaline medium, ultrathin Co3O4 nanosheets exhibited excellent OER catalytic activity, with a small overpotential (367 mV for 10 mA/cm2) and faster reaction kinetics (65 mV/dec).Moreover, the electrocatalyst still maintained 68% of its original catalytic activity after 24 h operation. This work provides an extensive and reliable method for the preparation of low-cost and highly efficient OER electrocatalysts. 相似文献
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目的 提高纸张基底上有机材料的导电性。方法 以有机半导体材料聚3,4-乙撑二氧噻吩/聚苯乙烯磺酸盐（PEDOT/PSS）为导电材料,以不同纸张（硫酸纸、胶版纸、复印纸和喷墨打印纸）做基底,利用二甲基亚砜（DMSO）、异丙醇（IPA）二元溶剂掺杂PEDOT/PSS溶液,对比分析PEDOT/PSS涂层在纸张上的导电性能,同时探讨多层单一浓度、多层降浓度、多层升浓度涂布对涂层导电性能的影响。结果 在PEDOT/PSS溶液中掺杂单一溶剂DMSO,添加DMSO体积分数为5%时,可以得到最佳的导电性能;通过二元溶剂掺杂优化PEDOT/PSS溶液在纸上的成膜,最佳体积分数为23%;同时在不同浓度配方下,喷墨打印纸的涂层导电性能最好;多层降浓度涂布可以将涂层方阻由13 kΩ/□降为0.255 kΩ/□。结论 利用二元溶剂掺杂能够在很大程度上提高了PEDOT/PSS导电涂层的导电性能;表面致密、平滑及透气性低的纸张是最佳的基底选择;多层降浓度涂布是最佳方式。 相似文献
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《Ceramics International》2019,45(13):15906-15912
A facile chemical bath deposition method to grow 10-nm-thick ZnO nanoflakes (NFs) on carbon cloth (CC) was developed; further, free-standing, flexible lithium-ion -battery (LIB) anodes with good electrical contact between current collector and the active substance were prepared. The as-prepared ZnO NFs/CC-based LIB anodes showed a high specific capacity of 1754 mAh g−1 at a current density of 0.1 A g−1, a capacity retention of almost 52.9% at a current density of 2 A g−1, as well as high rate capability. Moreover, the anodes demonstrated a high capacity with reversiblity of approximately 1650 mAh g−1 and only 6% capacity fading at a current density of 0.1 A g−1, even after 100 cycles. These results imply that the synthesized, unique ZnO NFs/CC nanostructures can be employed as high-efficiency anode materials for flexible LIBs. 相似文献
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Shuaijun Li Caiting Meng Qian Hao Luyao Dai Jiahong Shi Ji Xu Xin Zhou Sitong Zhao Jinfan Yang Huafeng Kang Yuzhu Hou Mingzhen Zhang Xiaobin Ma Mingqian Tan Hao Wu 《Advanced functional materials》2024,34(17):2312595
Immune checkpoint blockade (ICB) therapy has emerged as a promising approach in clinical oncology. For brain metastases, the presence of the robust blood–brain barrier (BBB) and potential immune-related adverse events (irAEs) pose significant challenges. Here, a multistage-responsive antibody-delivery strategy is developed for non-small cell lung cancer (NSCLC) brain metastases, with the ultra-pH sensitivity borate bonds. The antibody-delivery nanoformulation (MB-aPDL1) is able to maintain the “silent state” in health tissue, cross the BBB/BTB by the GLUT1-mediated transcytosis, release the functionalized aPDL1 responsively, and promote the aPDL1 tumor-anchoring. In the in vivo tumor region, the MB-aPDL1 rapidly releases the activated BPA6-aPDL1, which successfully anchors to the tumor cells and improves the efficiency of ICB therapy. The two in vivo ICB therapy studies show a significant tumor growth inhibition from the MB-aPDL1 with an encouraging cure rate of 20% for the NSCLC brain metastases, due to enhanced immune response in tumor, commendably with less behavioral adverse reactions and liver damage. Taken together, this antibody-delivery strategy holds substantial potential for application in clinical treatment of brain metastases. 相似文献
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目的 为确定步进电机驱动器和EPE衬垫的配合间隙与振动的关系.方法 选取步进电机驱动器为研究对象,以密度为20,28,32 kg/m3的EPE衬垫为隔振包装,研究对象与衬垫在垂直方向的配合间隙为?4,?2,0,2,4 mm.定制木质夹具的密度为32 kg/m3,配合间隙为?4 mm的EPE衬垫模型,参照ASTM-D4169随机振动试验部分的PSD功率谱密度曲线,进行随机振动试验分析.依据试验结果,修正该包装件的仿真模型、接触方式、网格划分等,仿真结果与试验结果的RPSD曲线吻合程度良好.依据该包装件的仿真设置,对密度为20,28 kg/m3的系列配合包装件进行仿真分析.结果 同一密度EPE衬垫,间隙配合比过盈配合振动强度低,0 mm配合的RMS值最小,振动强度最低.同一配合间隙,过盈配合时,EPE衬垫密度越低,RMS值越小,振动强度越低;间隙配合时,EPE衬垫密度越高,RMS值越低,振动强度越低.结论 采用EPE衬垫包装步进电机驱动器时,在同密度衬垫和同量级的外界激励下,0 mm配合隔振性能最佳,间隙配合隔振性能优于过盈配合. 相似文献
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目的研究不同楞型瓦楞结构材料在准静态条件下对瓦楞方向相关力学性能的影响。方法通过有限元模拟的方法,在准静态压缩条件下,得到不同楞型的瓦楞结构材料在瓦楞方向上的变形模式、应力-应变曲线等,通过能量效率法对其峰应力、密实化应变、平均抗压强度和单位体积吸收能量等进行对比分析。结果在同一壁厚条件下,A,C,B,E这4种楞型的峰应力、平均抗压强度、单位体积吸收能量依次增大;对于任一楞型来说,峰应力、平均抗压强度、单位体积吸收能量随壁厚的增大而增大,且与其呈线性关系;随着壁厚的增大,A,C,B,E这4种楞型的峰应力、平均抗压强度、单位体积吸收能量的增长幅度依次增大。结论楞型对瓦楞结构材料瓦楞方向的力学性能有显著影响,在其他条件相同的情况下,A,C,B,E这4种楞型的力学性能依次增强。 相似文献
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目的 研究木包装箱在全生命周期过程中对环境的影响,对比钢边箱和传统木箱对环境的影响.方法 通过全生命周期分析软件eBalance分析2款木包装箱从产品生产、物流运输到使用后的废物管理整个生命周期的物耗、能耗及向环境中的排放,对其数据清单进行分类、特征化和归一化计算,得到木包装箱3个流程的主要环境影响类型和对应指标值.结果 传统木箱在产品生产、物流运输和废物管理流程的LCIA加权综合指标分别为6.87514×10?9,1.93549×10?12,5.20×10?13,其中胶合板生产在产品生产过程中的占比为99.86％,胶合板处理在废物管理过程中的占比为99.82％;钢边箱在产品生产、物流运输和废物管理流程的LCIA加权综合指标分别为6.53463×10?9,3.57256×10?13,2.96531×10?13,其中胶合板生产在产品生产过程中的占比为97.43％,胶合板处理在废物管理过程中的占比为99.38％;钢边箱对环境影响的总量比传统木箱小约5％.结论 木包装箱全生命周期的环境影响主要体现在胶合板的生产和废物管理过程中,木包装箱在设计、生产加工、运输、废弃物处理等方面都有较大的改进余地,钢边箱比传统木箱更具有环境友好性,对木包装箱绿色化的生产设计具有参考意义. 相似文献