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首页> 外文期刊>Biocontrol Science >Cleanability of titanium and stainless steel particles in relation to surface charge aspects.
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Cleanability of titanium and stainless steel particles in relation to surface charge aspects.

机译：相对于表面电荷而言，钛和不锈钢颗粒的清洁性。

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摘要

The cleanability of titanium and 316L stainless steel particles was studied in terms of their apparent surface charge density (sigma(app)). Bovine serum albumin (BSA) was used as the model fouling agent. Curves for the sigma(app) of titanium and stainless steel particles showed the apparent points of zero charge (pzc(app)) of 4.6 and 8.5, respectively. Compared with the curve for the sigma(app) of stainless steel, that of titanium was characterized by small positive and large negative sigma(app) values. The isotherms for BSA adsorption and the saturation amount of BSA adsorbed on titanium and stainless steel depended largely on the intrinsic properties of BSA. In continuous cleaning in a plug-flow column fed by a 0.05M NaOH solution, BSA was found to be faster desorbed from titanium than from stainless steel, and smaller amounts of BSA remaining after 120-min cleaning were observed on titanium. Kinetic analysis showed that the two first-order desorption rate constants, reflecting the rate of BSA desorption in the initial and later stages of cleaning, for titanium were respectively 1.7-fold and 1.3-fold higher than those values for stainless steel. It could be suggested that the better cleanability of titanium was probably due to the small binding strength of BSA on slightly negatively-charged titanium surfaces and due to their large negative sigma(app) values under alkaline cleaning conditions.
机译：根据表观表面电荷密度（sigma（app））研究了钛和316L不锈钢颗粒的清洁性。牛血清白蛋白（BSA）用作模型结垢剂。钛和不锈钢颗粒的sigma（app）曲线分别显示出零电荷（pzc（app））的表观点分别为4.6和8.5。与不锈钢的sigma（app）曲线相比，钛的特征在于小的sigma（app）正值和大的负sigma（app）值。 BSA吸附的等温线以及BSA在钛和不锈钢上吸附的饱和量在很大程度上取决于BSA的固有性质。在用0.05M NaOH溶液进料的活塞流塔中进行连续清洗时，发现BSA从钛中的吸附速度要比从不锈钢中解吸的快，并且在钛清洗120分钟后观察到的BSA残留量较小。动力学分析表明，钛的两个一级解吸速率常数反映了清洗初期和后期的BSA解吸速率，分别比不锈钢高1.7倍和1.3倍。可以认为，钛的更好的清洁性可能是由于BSA在带负电的钛表面上的结合强度较小，以及在碱性清洁条件下其负σ（app）值较大。

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