A novel and efficient approach for imparting magnetic susceptibility to lignocellulosic fibers
A novel and efficient approach for imparting magnetic susceptibility to lignocellulosic fibers
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DOI：
10.1016/j.carbpol.2004.11.026
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发表时间：
2005-03
影响因子：
11.2
通讯作者：
Douglas G. Mancosky;L. Lucia
中科院分区：
文献类型：
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作者：
Douglas G. Mancosky;L. Lucia
我们通过在过氧化氢漂白化学过程中以非均相方式向纤维中加入铁粉来赋予木质纤维素纤维磁化率。因此，我们通过在化学氧化过程中在特定水平的铁下通过过氧化氢的芬顿催化故意诱导纤维素降解，在纤维中产生羧酸基团。因此，铁颗粒具有暴露的氧化铁层，其允许带负电荷的纤维酸基团的离子中和。在去除未附着的过量铁之后，这些纤维被铸造成具有两种不同原始铁浓度的二维片材，并测试其物理和化学性质。物理测试包括拉伸、零距拉伸、卡尺和表面电阻率。化学测试包括表面电荷、木质素含量（kappa）和粘度。还进行了SEM和ICP。值得注意的是，尽管纤维强度有所减弱，但掺入铁的磁敏感片材仍能够保持与未漂白片材相似的拉伸强度。这可能是由于化学精炼现象，其允许增加纤维-纤维粘合。保留铁的引入也显著改变了纸张的表面电阻率。这种纤维可用于需要电荷传导或分散的应用中。
We have imparted magnetic susceptibility to lignocellulosic fibers by adding iron powder in a heterogeneous manner to the fibers during hydrogen peroxide bleaching chemistry. We have therefore generated carboxylic acid groups in the fibers by deliberately inducing cellulose degradation through Fenton catalysis of the hydrogen peroxide during the chemical oxidation process at a specified level of iron. The iron particles consequently have an exposed layer of iron oxide that allows ionic neutralization of the negatively charged fiber acid groups. After removal of non-attached, excess iron, these fibers have been cast into two-dimensional sheets with two different original iron concentrations and tested for physical and chemical properties. Physical tests included tensile, zero-span tensile, caliper, and surface resistivity. Chemical tests included surface charge, lignin content (kappa) and viscosity. SEM and ICP were also conducted. Remarkably, the magnetically susceptible sheets with incorporated iron were able to retain a tensile strength similar to the unbleached sheets despite attenuation in fiber strength. This is likely due to a chemical refining phenomenon which allowed for increased fiber–fiber bonding. The introduction of the retained iron also significantly alters the surface resistivity of the paper sheets. Such fibers may have a use in applications where charge conduction or dispersion is necessary.