Mohamed Zuki Fathiah, Edyvean Robert G J, Pourzolfaghar Hamed, Kasim Norherdawati
Department of Chemical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.
Department of Chemical and Biological Engineering, University of Sheffield, Newcastle Street, Sheffield S1 3JD, UK.
Biomimetics (Basel). 2021 Jan 8;6(1):5. doi: 10.3390/biomimetics6010005.
A novel model is developed to evaluate the van der Waals (vdW) interactions between a capsule shaped bacterium () and flat minerals plates in different approach profiles: Vertically and horizontally. A comparison of the approaches to the well-developed spherical particle to mineral surface (semi-infinite wall and spherical) approach has been made in this investigation. The van der Waals (vdW) interaction potentials for a capsule-shaped bacterium are found using Hamaker's microscopic approach of sphere to plate and cylinder to plate either vertically or horizontally to the flat surface. The numerical results show that a horizontal orientated capsule shaped bacterium to mineral surface interaction was more attractive compared to a capsule shaped bacterium approaching vertically. The orientation of the bacterial approaching a surface as well as the type and topology of the mineral influence the adhesion of a bacteria to that surface. Furthermore, the density difference among each type of bacteria shape (capsule, cylinder, and sphere) require different amounts of energy to adhere to hematite and quartz surfaces.
开发了一种新型模型，以评估胶囊状细菌与扁平矿物平板在不同接近轮廓下的范德华（vdW）相互作用：垂直和水平方向。在本研究中，已将该方法与成熟的球形颗粒与矿物表面（半无限壁和球形）方法进行了比较。使用哈马克的球体与平板以及圆柱体与平板的微观方法，在垂直或水平于平面的方向上，找到胶囊状细菌的范德华（vdW）相互作用势。数值结果表明，与垂直接近的胶囊状细菌相比，水平取向的胶囊状细菌与矿物表面的相互作用更具吸引力。细菌接近表面的取向以及矿物的类型和拓扑结构会影响细菌与该表面的粘附。此外，每种细菌形状（胶囊、圆柱体和球体）之间的密度差异需要不同量的能量来粘附到赤铁矿和石英表面。
