Effects of the amino acid sequence on thermal conduction through β-sheet crystals of natural silk protein

Zhang, Lin; Bai, Zhitong; Ban, Heng; Liu, Ling

doi:10.1039/c5cp04621a

Cited by 19 publications

(9 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, PVA chains are more extended due to intra-PVA hydrogen bonds and steric repulsion between neighboring PVA chains, which is a positive factor for along-chain thermal transport. Second, with a mechanism similar to that previously shown by us for protein β-sheets and polymer nanofibers, [59][60][61] intra-PVA hydrogen bonds can enhance thermal transport across the densely packed PVA layer. Third, the hydrogen bonds formed between PVA and PMMA facilitate thermal transport across the relatively planar interface.…”

Section: Pvasupporting

confidence: 53%

See 1 more Smart Citation

Hierarchically hydrogen-bonded graphene/polymer interfaces with drastically enhanced interfacial thermal conductance

Zhang

Liu

2019

Nanoscale

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Pvasupporting

confidence: 53%

“…S9). Due to the importance of hydrogen bonds in nanoscale thermal transport, [57][58][59][60][61] the vast…”

Section: Effect Of Grafting Density On Interfacial Molecular Morpholomentioning

confidence: 99%

Hierarchically hydrogen-bonded graphene/polymer interfaces with drastically enhanced interfacial thermal conductance

Zhang

Liu

2019

Nanoscale

Self Cite

View full text Add to dashboard Cite

show abstract

“…A polarisation dependence of the IR absorbance of amides in silk fiber can provide deeper insights in molecular orientation of hierarchial silk structure; it is known to define thermal conductivity, κ , which is increasing in the stretched form 25 ( E is the Young’s modulus) and is increasing under strain towards the onset of melting at around 200 °C 26 . In the presence of hydrogen bonding, the orientation is linked to an increased crystallinity 27 , 28 . Nanoscale orientation of proteins and their 3D conformation are at the core of their optical, mechanical, thermal, and bio-functions.…”

Section: Introductionmentioning

confidence: 99%

Orientational Mapping Augmented Sub-Wavelength Hyper-Spectral Imaging of Silk

Ryu

Balčytis

Wang

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Molecular alignment underpins optical, mechanical, and thermal properties of materials, however, its direct measurement from volumes with micrometer dimensions is not accessible, especially, for structurally complex bio-materials. How the molecular alignment is linked to extraordinary properties of silk and its amorphous-crystalline composition has to be accessed by a direct measurement from a single silk fiber. Here, we show orientation mapping of the internal silk fiber structure via polarisation-dependent IR absorbance at high spatial resolution of 4.2 μm and 1.9 μm in a hyper-spectral IR imaging by attenuated total reflection using synchrotron radiation in the spectral fingerprint region around 6 μm wavelength. Free-standing longitudinal micro-slices of silk fibers, thinner than the fiber cross section, were prepared by microtome for the four polarization method to directly measure the orientational sensitivity of absorbance in the molecular fingerprint spectral window of the amide bands of β-sheet polypeptides of silk. Microtomed lateral slices of silk fibers, which may avoid possible artefacts that affect spectroscopic measurements with fibers of an elliptical cross sections were used in the study. Amorphisation of silk by ultra-short laser single-pulse exposure is demonstrated.

show abstract

“…Second, recent advances in surface treatment have made it relatively simple to anchor hydrogen‐bond‐capable chemical groups to the graphene surfaces to enable hydrogen bonds with many polymers. Third, hydrogen‐bond‐facilitated thermal conduction has been recently demonstrated in several other material systems including crystalline polymer nanofibers, amorphous polymer blends, along with silk β‐sheets and α‐helices . However, the use of hydrogen bonds to improve the interfacial thermal transport at graphene/polymer interfaces has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Exceptional Thermal Conductance across Hydrogen‐Bonded Graphene/Polymer Interfaces

Zhang

Bai

Liu

2016

Adv Materials Inter

Self Cite

View full text Add to dashboard Cite

the exceptional thermal properties of graphene and nanotubes, thereby reducing the overall conductivities of the nanocomposites.To improve the interfacial thermal conduction, interfaces between dissimilar materials need to be engineered for reduced phonon scattering. Current approaches include, but are not limited to, controlling interfacial adhesion, [16][17][18] improving interfacial stiffness, [ 19,20 ] strengthening interfacial interactions, [ 21,22 ] and manipulating phonon modes. [23][24][25] For graphene/polymer nanocomposites, in particular, the interfacial thermal transport can be improved by changing the orientation of few-layer graphene, [ 8 ] grafting graphene with polymer chains, [ 26 ] and functionalizing graphene for tailored phonon modes. [ 27 ] In the fi rst approach, the improvement results from the high thermal conductivity of graphene/graphite in the basal plane along with the enhanced interfacial coupling. [ 28,29 ] In the other two, the polymer chains and functional groups serve as thermal bridges to couple the vibrational modes of graphene with those of the polymeric matrix, thereby minimizing phonon scattering and improving thermal transport.Despite the progress, little attention has been drawn to the manipulation of bonding strength at the graphene/polymer interfaces for improved heat transfer. In most nanocomposites, [ 26,27 ] molecular interactions at material interfaces are dominated by van der Waals forces. It is hypothesized that, interfacial heat transfer can be signifi cantly improved by enabling hydrogen bonds at the interfaces. The hypothesis is made based on three reasons. First, the strength of hydrogen bonds ranges from 10 to 190 kJ mol -1 , 1-2 orders of magnitude higher than that of the van der Waals interactions. [ 30,31 ] Second, recent advances in surface treatment [ 32 ] have made it relatively simple to anchor hydrogen-bond-capable chemical groups to the graphene surfaces to enable hydrogen bonds with many polymers. Third, hydrogen-bond-facilitated thermal conduction has been recently demonstrated in several other material systems including crystalline polymer nanofi bers, [ 33 ] amorphous polymer blends, [ 34 ] along with silk β-sheets [ 35,36 ] and α-helices. [ 37,38 ] However, the use of hydrogen bonds to improve the interfacial thermal transport at graphene/polymer interfaces has not yet been reported.Here, using reverse nonequilibrium molecular dynamics along with various vibrational mode and structural analysis tools, we demonstrate that the presence of hydrogen bonds Ineffective heat transfer between dissimilar materials of drastically different properties is a challenge for many areas including nanoelectronics and nanocomposites. Here, using atomistic simulations, it is demonstrated that the thermal conductance across the interfaces between graphene and poly(methyl methacrylate) (PMMA) can be improved by 273% by introducing hydrogen-bond-capable hydroxyl groups to the interfaces. Stronger than van der Waals interactions, the hydrogen bonds are found to improve t...

show abstract

Effects of the amino acid sequence on thermal conduction through β-sheet crystals of natural silk protein

Cited by 19 publications

References 38 publications

Hierarchically hydrogen-bonded graphene/polymer interfaces with drastically enhanced interfacial thermal conductance

Hierarchically hydrogen-bonded graphene/polymer interfaces with drastically enhanced interfacial thermal conductance

Orientational Mapping Augmented Sub-Wavelength Hyper-Spectral Imaging of Silk

Exceptional Thermal Conductance across Hydrogen‐Bonded Graphene/Polymer Interfaces

Contact Info

Product

Resources

About