Tuning Polymorphs and Morphology of Microbially Induced Calcium Carbonate: Controlling Factors and Underlying Mechanisms.
Tuning Polymorphs and Morphology of Microbially Induced Calcium Carbonate: Controlling Factors and Underlying Mechanisms.
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DOI：
10.1021/acsomega.1c00559
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发表时间：
2021-05-11
期刊：
影响因子：
4.1
通讯作者：
Ma H
中科院分区：
文献类型：
--
作者：
Khanjani M;Westenberg DJ;Kumar A;Ma H
微生物沉淀碳酸钙（CaCO 3）因其在生物胶凝、医学、土壤加固等领域的潜在应用而受到广泛关注。巴氏孢子八叠球菌（S. pasteurii）巴氏芽孢杆菌（Bacilluspasteurii），以前称为巴氏芽孢杆菌（Bacilluspasteurii），由于其高尿素分解活性，已经被研究用于CaCO 3生物矿化。相对于细菌细胞壁、胞外聚合物和细菌活性的有机副产物的存在的高度过饱和在CaCO 3多晶型物的形成和稳定中起重要作用。虽然微生物诱导的碳酸钙及其多晶型已被广泛研究，多晶型选择和形态演变的机制还没有很好地理解。本研究采用非原位的方法来解决生物矿化的复杂性，在活的生物体的存在下，并阐明如何溶液化学，细菌活性和沉淀动力学改变S诱导的碳酸钙的多晶型和形态。巴氏杀菌法。结果表明，在足够的钙离子和尿素（作为碳酸盐源）存在下，细菌活性有利于球文石的形成和稳定。形态学观察还提供了有关颗粒微观结构的有价值的信息。随着有机物浓度的增加，方解石由单晶结构向多晶结构演化，球霰石由球形结构向椭圆形结构演化。特定的官能团也对CaCO 3多晶型物施加形态控制。然而，与球霰石多晶型物相比，方解石多晶型物对这些官能团的组成和取向的敏感性更高。这些研究结果提供了重要的见解，可以用来限制一组实验条件，合成一定的多晶型比球霰石/方解石或特定形态的每种多晶型物，并阐明在这种复杂的生物环境中的结晶和相变机制。
Microbially precipitated calcium carbonate (CaCO3) has drawn broad attention due to its potential applications in various areas, for example, biocementation, medicine, and soil reinforcement. Sporosarcina pasteurii (S. pasteurii), formerly known as Bacillus pasteurii, has been investigated for CaCO3 biomineralization due to its high ureolytic activity. A high degree of supersaturation with respect to the presence of bacterial cell wall, extracellular polymeric substances, and organic byproducts of bacterial activity plays an important role in the formation and stabilization of CaCO3 polymorphs. Although microbially induced CaCO3 and its polymorphs have been investigated broadly, the mechanisms of polymorph selection and morphological evolution are not well understood. This study employs ex situ approaches to address the complication of biomineralization in the presence of living organisms and to elucidate how solution chemistry, bacterial activity, and precipitation kinetics alter the polymorphism and morphology of CaCO3 induced by S. pasteurii. The results indicate that in the presence of enough calcium ions and urea (as a carbonate source), the bacterial activity favors the formation and stabilization of vaterite. The morphological observations also provide valuable information on the particles’ microstructure. The morphology of calcite evolves from single crystal to polycrystalline structures, and the morphology of vaterite evolved from spherical to oval-shaped structures on increasing the organic material concentration. Specific functional groups also exert morphological control on CaCO3 polymorphs. However, the sensitivity of the calcite polymorph to the composition and orientation of these functional groups is higher compared to that of the vaterite polymorph. These findings offer important insights that can be used to constrain a set of experimental conditions for synthesizing a certain polymorph ratio for vaterite/calcite or a particular morphology of each polymorph and shed light on the crystallization and phase transformation mechanisms in such complicated bioenvironments.
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影响因子：
4.2
作者：
Dickinson, SR;Mcgrath, KM
通讯作者：
Mcgrath, KM
影响因子：
16.6
作者：
Gebauer, Denis;Gunawidjaja, Philips N.;Hedin, Niklas
通讯作者：
Hedin, Niklas
影响因子：
3.8
作者：
De Muynck, Willem;De Belie, Nele;Verstraete, Willy
通讯作者：
Verstraete, Willy
影响因子：
3.8
作者：
Bots, Pieter;Benning, Liane G.;Shaw, Samuel
通讯作者：
Shaw, Samuel
DOI：
10.1007/s10295-009-0578-z
发表时间：
2009-07-01
影响因子：
3.4
作者：
Achal, V.;Mukherjee, A.;Reddy, M. Sudhakara
通讯作者：
Reddy, M. Sudhakara