Deformation Strengthening of Biopolymer in Nacre

Xu, Zhi-Hui; Li, Xiaodong

doi:10.1002/adfm.201100167

Cited by 130 publications

(69 citation statements)

References 27 publications

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“…The deformation of the sheets of the organic matrix between growing nacre platelets was studied by nanoindentation measurements [47]. Deformation strengthening of the stretched organic strand in bending has also been reported [94], confirming the energy dissipation by the modular structure in the macromolecule.…”

Section: Energy-dissipating Mechanism Of the Organic Phasementioning

confidence: 89%

The toughening mechanism of nacre and structural materials inspired by nacre

Kakisawa

Sumitomo²

2011

Science and Technology of Advanced Materials

140

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The structure and the toughening mechanism of nacre have been the subject of intensive research over the last 30 years. This interest originates from nacre's excellent combination of strength, stiffness and toughness, despite its high, for a biological material, volume fraction of inorganic phase, typically 95%. Owing to the improvement of nanoscale measurement and observation techniques, significant progress has been made during the last decade in understanding the mechanical properties of nacre. The structure, microscopic deformation behavior and toughening mechanism on the order of nanometers have been investigated, and the importance of hierarchical structure in nacre has been recognized. This research has led to the fabrication of multilayer composites and films inspired by nacre with a layer thickness below 1 µm. Some of these materials reproduce the inorganic/organic interaction and hierarchical structure beyond mere morphology mimicking. In the first part of this review, we focus on the hierarchical architecture, macroscopic and microscopic deformation and fracture behavior, as well as toughening mechanisms in nacre. Then we summarize recent progress in the fabrication of materials inspired by nacre taking into consideration its mechanical properties.

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Section: Energy-dissipating Mechanism Of the Organic Phasementioning

confidence: 89%

The toughening mechanism of nacre and structural materials inspired by nacre

Kakisawa

Sumitomo²

2011

Science and Technology of Advanced Materials

140

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“…Additionally nanoscale mechanisms, such as stiffening of biopolymer upon stretching limit the sliding of the aragonite platelets. 8,15,16 Therein sacrificial bonds and hidden length scales are characteristic for biological composites. [17][18][19] The nacre-like complexity is difficult to transfer into synthetic materials to reproduce the mechanical behavior, as the highly ordered self-assembled structure and supramolecular interactions need to be mimicked at several length scales.…”

Section: Introductionmentioning

confidence: 99%

Deoxyguanosine Phosphate Mediated Sacrificial Bonds Promote Synergistic Mechanical Properties in Nacre-Mimetic Nanocomposites

Martikainen

Walther

Seitsonen³

et al. 2013

Biomacromolecules

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SwedenNacre, biomimetics, nanocomposite, self-assembly, montmorillonite, supramolecular 2 ABSTRACT We show that functionalizing polymer-coated colloidal nanoplatelets with guanosine groups allows synergistic increase of mechanical properties in nacre-mimetic lamellar self-assemblies.Anionic montmorillonite (MTM) was first coated using cationic poly(diallyldimethylammonium chloride) (PDADMAC) to prepare core-shell colloidal platelets, and subsequently the remaining chloride counter-ions allowed exchange to functional anionic 2'-deoxyguanosine 5'-monophosphate (dGMP) counter-ions, containing hydrogen bonding donors and acceptors. The compositions were studied using elemental analysis, scanning and transmission electron microscopy, wide angle X-ray scattering, and tensile testing. The lamellar spacing between the clays increases from 1.85 nm to 2.14 nm upon addition of the dGMP. Adding dGMP increases the elastic modulus, tensile strength, and strain 33.0 %, 40.9 %, and 5.6 %, respectively, to 13.5 GPa, 67 MPa, and 1.24 %, at 50 % relative humidity. This leads to an improved toughness seen as a ca. 50 % increase of the work-to-failure. This is noteworthy, as previously it has been observed that connecting the core-shell nanoclay platelets covalently or ionically leads to increase of the stiffness, but to reduced strain. We suggest that the dynamic supramolecular bonds allow slippage and sacrificial bonds between the self-assembling nanoplatelets, thus promoting toughness, still providing dynamic interactions between the platelets.3

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“…Bio-inspired composites incorporating high-aspect inorganic fillers promise dramatic mechanical improvements as the filler loadings are increased beyond those of conventional organoclay composites to yield highly stratified materials possessing a so-called brick-and-mortar structure [1][2][3][4][5][6][7][8][9][10][11]. Additionally, fillers with nanometric dimensions can provide mechanical reinforcement with a minimal degree of light scattering, thus affording mechanically strong transparent nanocomposite materials.…”

Section: Introductionmentioning

confidence: 98%

Electrophoretic deposition of organically modified gibbsite nanocomposites with liquid crystalline character

et al. 2012

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A scalable synthetic approach was developed for the purpose of producing nanoplatelet composites with nacrelike structural organization. Gibbsite nanoplatelets were first synthesized and then organically modified to provide stable suspensions in organic solvents. The nanoplatelets were subsequently deposited from select organic phases using nonaqueous electrophoretic methods. The electrophoresis was carried out in the presence of organic diacrylate monomer resins that were ultimately retained to form thick (ca. 10-1,000 lm) nanocomposite films. The resulting optically transparent films exhibited a high solids loading ([40 % by volume) and a layered morphology consistent with colloidal liquid crystal systems. Following release from the conductive substrate, the deposited films were rolled, pressed, and polymerized to form bulk nanocomposites with improved strength and elastic modulus. The stratified organization of the nanoplatelets was successfully preserved throughout the processing steps. The deposition method is useful for the continuous production of bulk nanocomposites, and the resulting materials serve as a platform for further developments with alternative nanoplatelets possessing improved mechanical properties and optical transparency.

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Deformation Strengthening of Biopolymer in Nacre

Cited by 130 publications

References 27 publications

The toughening mechanism of nacre and structural materials inspired by nacre

The toughening mechanism of nacre and structural materials inspired by nacre

Deoxyguanosine Phosphate Mediated Sacrificial Bonds Promote Synergistic Mechanical Properties in Nacre-Mimetic Nanocomposites

Electrophoretic deposition of organically modified gibbsite nanocomposites with liquid crystalline character

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