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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Redox-initiated diffusion-limited aggregation in biopolymer
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Redox-initiated diffusion-limited aggregation in biopolymer

机译：生物聚合物中的氧化还原发起的扩散限制聚集

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Fractal patterns have been obtained in a polysaccharide (chitosan biopolymer) containing salt and an active metal wire. The amino groups in chitosan chelate with silver ions and form a cationic complex with the silver nitrate (AgNO3). Presence of the copper wire in the chitosan-AgNO3 system leads to an exothermic redox reaction which creates an anisotropy in the system affecting the growth mechanism. Initial movement of the ions is governed by the potential difference between the redox species/couple (Cu and Ag) and the energy released in terms of heat enhances the mobility of the mobile fractal forming species. This release in energy is reflected in the rise in temperature of the system by 4 degrees to 5 degrees C. Initially, dense patterns form around the corners of the metal wire, which in time change to diffusion-limited aggregates as the redox reaction rate changes due to the depletion of the active metal wire's ions. The fractal forming species (Ag) has been confirmed by x-ray diffraction, energy dispersive x-ray analysis and scanning electron microscopy. The fractal dimension determined by the box-counting method confirms the formation of a dense branched morphology at the corners of the metal wire and diffusion-limited aggregation away from the corners. The aggregation process and resulting pattern in the present experimental system evolves due to the varying spatial and temporal anisotropy existing within the system.
机译：在含有盐和活性金属线的多糖（壳聚糖生物聚合物）中获得了分形图案。壳聚糖螯合物中的氨基与银离子，与硝酸银（AgNO3）形成阳离子络合物。壳聚糖-AGNO3系统中的铜线的存在导致放热的氧化还原反应，其在影响生长机制的系统中产生各向异性。离子的初始流动受氧化还原物种/夫妇（Cu和Ag）之间的潜在差异，并且在热量释放的能量增强了移动分形成形物种的迁移率。能量中的这种释放在系统的温度升高4度到5℃。最初，在金属线的拐角周围形成致密的图案，随着氧化还原反应速率的变化，随着时间的变化，这在时间变化到扩散限制聚集体由于活性金属线的离子耗尽。通过X射线衍射，能量分散X射线分析和扫描电子显微镜证实了分形成形物种（Ag）。由盒计数方法确定的分形尺寸证实了在金属线的拐角处形成了致密的支链形态，并远离拐角的扩散限制聚集。本实验系统中的聚集过程和结果模式由于系统内存在的不同空间和时间各向异性而发展。

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