Processing of Ceramics by Biopolymers. Ultrastructure-Property Relationships in Biocrystals

Sarıkaya, Mehmet; Staley, James T.; Aksay, Ilahn A.

doi:10.21236/ada243061

Cited by 24 publications

(33 citation statements)

References 3 publications

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“…The mean molecular area of each protein was estimated by extrapolating the linear portion of each curve (between 15 mN͞m and 25 mN͞m) to a surface pressure equal to zero. Such extrapolations are routinely used to estimate the mean molecular area in films that are condensed but not under pressure (20 4 ), rinsed in deionized water, and oven-dried. CD spectra were measured at 25°C by using an Aviv Associates (Lakewood, NJ) 62DS CD spectrometer.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, because the designed binary pattern is compatible with a wide variety of different sequences, it may be possible to fabricate ␤-sheet monolayers by using combinations of side chains that are explicitly designed to favor particular applications of novel biomaterials. P roteins play key roles in controlling the self-assembly of biological materials (1)(2)(3)(4)(5). In recent years, interest has grown in mimicking biological self assembly (2-11) with peptides or proteins designed de novo.…”

mentioning

confidence: 99%

“…Such layers play important roles in biological mineralization by controlling the size, orientation, and morphology of inorganic crystals at the surface of the protein layer (2,5,(11)(12)(13)(14). A well-studied example of protein͞inorganic layering occurs in the nacre of mollusk shells (''mother of pearl'') (4,5,(11)(12)(13)(14)(15)(16)(17). These laminated structures are composed of alternating layers of a protein-rich matrix and aragonite (a crystal form of calcium carbonate).…”

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confidence: 99%

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Self-assembled monolayers from a designed combinatorial library of de novo β-sheet proteins

Wang

Groves

et al. 2001

Proc. Natl. Acad. Sci. U.S.A.

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A variety of naturally occurring biomaterials owe their unusual structural and mechanical properties to layers of ␤-sheet proteins laminated between layers of inorganic mineral. To explore the possibility of fabricating novel two-dimensional protein layers, we studied the self-assembly properties of de novo proteins from a designed combinatorial library. Each protein in the library has a distinct 63 amino acid sequence, yet they all share an identical binary pattern of polar and nonpolar residues, which was designed to favor the formation of six-stranded amphiphilic ␤-sheets. Characterization of proteins isolated from the library demonstrates that (i) they self assemble into monolayers at an air͞water interface; (ii) the monolayers are dominated by ␤-sheet secondary structure, as shown by both circular dichroism and infrared spectroscopies; and (iii) the measured areas (500-600 Å 2 ) of individual protein molecules in the monolayers match those expected for proteins folded into amphiphilic ␤-sheets. The finding that similar structures are formed by distinctly different protein sequences suggests that assembly into ␤-sheet monolayers can be encoded by binary patterning of polar and nonpolar amino acids. Moreover, because the designed binary pattern is compatible with a wide variety of different sequences, it may be possible to fabricate ␤-sheet monolayers by using combinations of side chains that are explicitly designed to favor particular applications of novel biomaterials. P roteins play key roles in controlling the self-assembly of biological materials (1-5). In recent years, interest has grown in mimicking biological self assembly (2-11) with peptides or proteins designed de novo. This interest is motivated both by a desire to test our understanding of self assembly in natural systems and by the drive to lay foundations for the fabrication of novel protein-based biomaterials.Self-assembled two-dimensional layers of proteins are of particular interest for the fabrication of biomaterials. Such layers play important roles in biological mineralization by controlling the size, orientation, and morphology of inorganic crystals at the surface of the protein layer (2,5,(11)(12)(13)(14). A well-studied example of protein͞inorganic layering occurs in the nacre of mollusk shells (''mother of pearl'') (4, 5, 11-17). These laminated structures are composed of alternating layers of a protein-rich matrix and aragonite (a crystal form of calcium carbonate). The proteins in the protein-rich layer are dominated by ␤-sheet secondary structure (1,5,(11)(12)(13)(14).To explore the possibility of fabricating de novo ␤-sheet layers, we studied the self-assembly properties of a collection of de novo proteins derived from a combinatorial library of sequences designed to favor the formation of amphiphilic ␤-strands punctuated by reverse turns (18,19). Each sequence in the library is distinct. However, all sequences are the same length (63 residues), and they all share the identical binary patterning of polar and nonpolar residues. Her...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Self-assembled monolayers from a designed combinatorial library of de novo β-sheet proteins

Wang

Groves

et al. 2001

Proc. Natl. Acad. Sci. U.S.A.

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“…A widespread strategy to fulfill the quest for stronger materials is to exploit composite structures, from simple foam to modern carbon nanotube composites, 1) sometimes mimicking natural strong materials 2,3) such as nacre 4,5) and bone. 6) In the case of cellular solids 7) which include wood, cork, plant parenchyma, stereom of sea cucumber, trabecular bone, carbon and polymeric foams and porous materials, theories based on the unit cell structure have been successful to reveal that fracture mechanical properties can be well understood as a function of the relative density (i.e., volume fraction of solid in foam) in particular for hard cellular solids; 7,8) this is confirmed recently even for very soft foams but with different scaling relations.…”

Section: Introductionmentioning

confidence: 99%

Crack-Tip Stress Concentration and Structure Size in Nonlinear Structured Materials

Aoyanagi

Okumura

2009

J. Phys. Soc. Jpn.

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We revisit the standard elastic-plastic fracture theory developed by Hutchinson, Rice, and Rosengren (HRR) and reproduce, by a simple scaling argument, the stress singularity around the crack tip derived by HRR. From the singular behavior thus reconfirmed, we propose a general scaling relation which guarantees an effect similar to the tip-blunting effect: the maximum stress at the crack tip in a structured material can be reduced by increasing the structure size. This proposed relation is explicitly confirmed by numerical calculations performed for a coarse-grained lattice model, and leads to general scaling relations for fracture surface energy and to a possible reinforcement of cellular solids due to the pores.

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“…The demand for multiscale, nanostructured ceramic materials with a controlled microstructure and tailored properties at an even smaller length scale beyond 100 nm is still growing [1][2][3][4]. Most of the applied manufacturing techniques for nano-scaled functional ceramics are top-down strategies limiting the accessibility of nano-scaled microstructures to minimum sizes of around 100 nm.…”

Section: Introduction To Biotemplatingmentioning

confidence: 99%

Biotemplating: polysaccharides in materials engineering

Zollfrank¹

2010

WIT Transactions on Ecology and the Environment

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The generation of biominerals and hard tissue in nature is directed and templated by biomacromolecules. In many systems, polysaccharides play a significant role during the assembly of the inorganic phase. Polysaccharides exhibit a hierarchical multiscale order as well as self-assembly properties and they appear in a large variety of structures. The directed deposition of inorganic phases on polysaccharide templates is an interesting approach for the manufacturing of patterned functional materials. This paper highlights our recent developments on the bioinspired deposition and formation of inorganic phases on polysaccharide templates. Polysaccharides can be used at various structural levels from the molecular scale to three-dimensional parts in the millimetre range. The versatility of polysaccharide templating capabilities will be shown on onedimensional cellulose nanocrystals for formation of luminescent inorganic nanotubes for optoelectronic applications. The replication of complex plant tissue and processed lignocellulosic materials such as paper and cardboard into carbide based engineering and functional ceramics will be presented. The developed methods for the mineralisation of inorganic phases on polysaccharides are adapted for an innovative bioinspired route involving phototactic microorganisms, which are useful for the light-induced fabrication of hierarchically structured functional materials.

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Processing of Ceramics by Biopolymers. Ultrastructure-Property Relationships in Biocrystals

Cited by 24 publications

References 3 publications

Self-assembled monolayers from a designed combinatorial library of de novo β-sheet proteins

Self-assembled monolayers from a designed combinatorial library of de novo β-sheet proteins

Crack-Tip Stress Concentration and Structure Size in Nonlinear Structured Materials

Biotemplating: polysaccharides in materials engineering

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