title: Effects of β-sheet crystals and a glycine-rich matrix on the thermal conductivity of spider dragline silk.
abstract: We measured the thermal conductivity of Araneus ventricosus' spider dragline silk using a suspended microdevice. The thermal conductivity of the silk fiber was approximately 0.4Wm-1K-1at room temperature and gradually increased with an increasing temperature in a manner similar to that of other disordered crystals or proteins. In order to elucidate the effect of β-sheet crystals in the silk, thermal denaturation was used to reduce the quantity of the β-sheet crystals. A calculation with an effective medium approximation supported this measurement result showing that the thermal conductivity of β-sheet crystals had an insignificant effect on the thermal conductivity of SDS. Additionally, the enhancement of bonding strength in a glycine-rich matrix by atomic layer deposition did not increase the thermal conductivity. Thus, this study suggests that the disordered part of the glycine-rich matrix prevented the peptide chains from being coaxially extended via the cross-linking covalent bonds.
authors.affiliation: School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Republic of Korea.
authors.forename: Jinju
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Nano Mechanics, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Republic of Korea.
authors.forename: Duckjong
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Nano Mechanics, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Republic of Korea; Department of Nano Mechatronics, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea.
authors.forename: Seung-Mo
authors.initials: SM
authors.lastname: Lee
authors.affiliation: Jeong Woo Industrial Machine Co. Ltd., 253 5sandan-ro, Susin-myeon, Dongnam-gu, Cheonan-si, Chungcheongnam-do 31251, Republic of Korea.
authors.forename: Ji-Ung
authors.initials: JU
authors.lastname: Choi
authors.affiliation: School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Republic of Korea.
authors.forename: Myungil
authors.initials: M
authors.lastname: You
authors.affiliation: Department of Nano Mechanics, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Republic of Korea.
authors.forename: Hye-Mi
authors.initials: HM
authors.lastname: So
authors.affiliation: School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Republic of Korea.
authors.forename: Junkyu
authors.initials: J
authors.lastname: Han
authors.affiliation: Department of Electrical Engineering, Chungnam University, Yuseong-gu, Daejeon 34134, Republic of Korea.
authors.forename: Junghyo
authors.initials: J
authors.lastname: Nah
authors.affiliation: School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Republic of Korea. Electronic address: jhseol@gist.ac.kr.
authors.forename: Jae Hun
authors.initials: JH
authors.lastname: Seol
mesh_terms: D000818:Animals; D018360:Crystallography, X-Ray; D005998:Glycine; D008958:Models, Molecular; D000072757:Protein Conformation, beta-Strand; D047011:Silk / Q000737:chemistry*; D013112:Spiders / Q000737:chemistry*; D013814:Thermal Conductivity
chemical_list: D047011:Silk; D005998:Glycine
keywords: Glycine-rich matrix; Measurement; Spider dragline silk; Thermal conductivity; β-Sheet crystal