Laboratory for Biological and Bio-Inspired Materials

Laboratory
Li, Ling

Department of Mechanical Engineering
Blacksburg, VA 24061
540-231-9594

Ling Li, Ph.D.

Assistant Professor

Welcome to the Laboratory of Biological and Bio-inspired Materials led by Dr. Ling Li at the Department of Mechanical Engineering at Virginia Tech. Our group seeks to discover the fundamental structure-property relationships in multifunctional biological materials, elucidate the formation principles for biological and bio-inspired materials, develop novel in-situ mechanical measurement and analysis technologies, and finally develop bio-inspired structural and multifunctional materials. Feel free to browse our group website for more details. If you have any questions about me or my research, feel free to email me at lingl@vt.edu.

 

Recent group news

Research Directions

We seek inspirations from nature, e.g. transparent armor from transparent seashells, lightweight structural materials from natural cellular materials, multifunctional structural materials from mollusk shells with visual capabilities, etc., for the development of engineering structural material solutions. As summarized below, our research activities comprise in the following aspects: Structures, Formations, Methods, Mechanics, and Materials.

 

  • Elucidate structures and morphologies

     

     

     

     

     

    Precise and quantitative description of the biological structural materials is the first yet critical step to understand their formation pathways and functional properties. We particularly concentrate our efforts on developing multi-scale 3D structural characterization methods, such as FIB-SEM nano-tomography, synchrotron-based XTM  and micro-CT  and quantitative structural analysis algorithms. We also use a number of synthetic systems primarily based on carbonate materials in understanding morphogenesis of complex structures and developing functional materials and structures with precise structural control.

  • Understand formation pathways

    Understanding the forces and mechanisms of organisms produce (usually mineralized) structural materials that often exhibit remarkable control in sizes, shapes, crystallography, and positions will provide important insights and guidance for biomimetic synthesis and fabrication. Through in-situ and in-vivo studies on both synthetic and natural mineralization systems, we aim to contribute to the understanding of mineralization processes by focusing on precursor morphology, texture control, and structural morphogenesis.

  • Develop mechanical testing methods

    We utilize and develop multi-scale mechanical testing methods, such as nanoindentation, micro-pillar compression, single building block testing, and synchrotron in-situ mechanical tests. Combined with quantitative structural analysis during and/or after deformation, this approach enables mapping of critical fields and processes associated with the deformation (e.g. strains, stresses, dislocation activities, damage incidents, crack formation and propagation, delamination, etc.) for biological materials with complex 3D internal structures.

  • Discover Deformation Mechanisms

    With our multiscale 3D structural characterization and mechanical testing methods, we establish the structure-property relationship by elucidating the underlying physical mechanisms for damage tolerance and energy dissipation in biological structural materials. Depending on the nature of the model systems (e.g., mineralized vs organic, solid vs porous), micro-processes of interest include inclusion strengthening, deformation twinning, micro-crack initiation and coalescence, crack propagation and deflection, ligament buckling and fracture, etc.

  • Design Bio-inspired (Multi)functional Materials

    We transfer our understanding of biological structural materials to the design and fabrication of novel material systems that have properties superior to those of existing solutions. We are particularly interested in structural materials with multifunctional performance. Ongoing examples include bio-inspired transparent laminated glasses, flexible protection, metal/ceramic nanocomposites, bio-inspired sandwiched steels, self-assembled photonic crystals, etc.

Selected publications

1. C.N. Kaplan, W.L. Noorduin, L. Li, J. Aizenberg, L. Mahadevan, Controlled growth and form of precipitating microsculptures, Science, (2017) 355, 1396-1399.
2. L. Li*, M. J. Connors*, M. Kolle, G. England, D. Speiser, X. Xiao, J. Aizenberg and C. Ortiz, Multifunctionality of chiton biomineralized armor with an integrated visual system, Science, (2015) 350, 952-956. Featured in Front Cover.
3. L. Li^ and C. Ortiz, A Natural 3D interconnected laminate composite for enhanced damage resistance, Advanced Functional Materials, (2015) 25, 3463-3471. Featured in Front Cover.
4. L. Li*, S. Kolle*, M. Kolle, J. C. Weaver, C. Ortiz and J. Aizenberg, A highly conspicuous mineralized composite photonic architecture in the translucent shell of the blue-rayed limpet, Nature Communications, (2015) DOI: 10.1038/ncomms7322.
5. L. Li^, J. C. Weaver, and C. Ortiz, Hierarchical structural design for fracture resistance in the shell of a pteropod Clio pyramidata, Nature Communications, (2015) DOI: 10.1038/ncomms7216.
6. L. Li and C. Ortiz, Pervasive nanoscale deformation twinning as a catalyst for the efficient energy dissipation in a bioceramic armor, Nature Materials, (2014) 13, 501-507.
7. L. Li and C. Ortiz, Biological design for simultaneous optical transparency and mechanical robustness in the shell of Placuna placenta, Advanced Materials (2013) 25, 2344-2350.

Laboratory address:

Department of Mechanical Engineering
College of Engineering, Virginia Tech
635 Prices Fork Road, Blacksburg, VA 24061
540-231-6045