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Nanoscale to Macroscale Characterization of in—Situ Bacterial Biopolymers for Applications in Soil Stabilization

Authors :
Asha Latha Ramachandran
Abhijit Mukherjee
Navdeep K Dhami
Source :
Frontiers in Materials, Vol 8 (2022)
Publication Year :
2022
Publisher :
Frontiers Media S.A., 2022.

Abstract

Bacterial biopolymers produced extracellularly due to microbial metabolic activities have gained considerable interest in various engineering applications. The major advantages of bacterial biopolymers is their in-situ production and low water solubility, eliminating the requirement for mixing in granular substrates such as soils. These properties make them highly desirable and preferable to manufactured biopolymers. But for any engineering applications, it is crucial to understand the mechanical properties of these materials, which have been less explored. This investigation is the first attempt to quantify the nano and macro mechanical properties of in-situ bacterial biopolymer dextran produced by bacterial culture Leucononstoc mesenteroids. The fundamental mechanism of bacterial biopolymer-based cementation has been revealed through their morphographic and nanomechanical testing via atomic force microscopy, nanoindentation and scanning electron micrographs. The effect of bacterially produced biopolymers and commercial biopolymers on the macro-mechanical properties of soils was then investigated via needle penetration tests. In-situ biopolymers were found to be highly effective in stabilizing soils with comparable mechanical properties as commercial biopolymers. This study has demonstrated novel methods for testing in situ polymers and opened up the channels for their applications in numerous subsurface as well as surface applications.

Details

Language :
English
ISSN :
22968016
Volume :
8
Database :
Directory of Open Access Journals
Journal :
Frontiers in Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.0f39f2cd05d54d8d80ca7dee51a3d15c
Document Type :
article
Full Text :
https://doi.org/10.3389/fmats.2021.681850