16300

1685 دكتري

دكتري

نانوفناوري

اصفهان : دانشگاه صنعتي اصفهان

1399

شانزده، 143 ص، مصور، جدول، نمودار

حميدرضا سليمي جزي

مهشيد خرازيها

فتح الله كريم زاده، رحمت الله عمادي، محمد رفيعي نيا

1399/11/26

كتابنامه

مواد

مهندسي مواد

1399/11/28

2670671

144 Fabrication and Development of a Three Dimensional Graphene Polycaprolactone Nanocomposite Nerve Guide Conduit by Chemical Vapor Deposition Neda Bahremandi Tolou Bahremandi n@gmail com 2021 01 04 Department of Materials Engineering Isfahan University of Technology 84156 83111 Isfahan IranHamidreza Salimi jazi hrjazi@cc iut ac irMahshid kharaziha Kharaziha@cc iut ac irNicola Lisi Nicola lisi@enea itMahshid kharaziha Kharaziha@cc iut ac ir Department of Materials Engineering Isfahan University of Technology 84156 83111 Isfahan Iran ENEA Casaccia Italian National Agency for New Technologies Energy and Sustainable EconomicDevelopment Rome ItalyAbstractAiming at the production of light porous conductive bio safe composites in this study we are presented anovel fabrication method for monolithic three dimensional 3D graphene foam GF porous polymercomposites The synthesis adopted a novel process architecture by using Ni foam templates in an inductiveheating chemical vapor deposition growth process and by removing Ni chemically while retaining grapheneintegrity by the reversible application of cyclododecane CD finally we developed nondestructive coatingprocedures with polycaprolactone PCL solutions The composites were optimized to enhance electricalconduction flexibility and mechanical properties while mixing PCL and CD allowed to coat the GF with anovel mesoporous polymer coating By tuning the GF properties the typical electrical resistance of the 3Dforms can was reduced to a few 10s of Ohms The current study achieved a GF fraction ranging between 1 to7 3 wt with even the lower graphene content composites showing acceptable electrical and mechanicalproperties The wettability surface porosity and morphology did not show any significant change while thePC12 cell proliferation and extension were increased for 3D GF PCL nanocomposite It can be concludedthat 3D GF PCL nanocomposites are good candidates to utilize as a versatile system for the engineering ofperipheral nerve tissue Keywords Chemical Vapor Deposition graphene foams Polycaprolactone Nano composites graphenefilled polymers1 IntroductionThe addition of nano sized carbonaceous llers including graphene family nanomaterials topolymers may lead to a large enhancement in mechanical conductive and barrier propertiesover the pristine polymers Mohan et al 2018 Some methods were developed to producegraphene polymer composite scaffold with complex shapes focusing on biomedicalapplications a graphene poly lactic co glycolic acid composite containing 60 wt graphene was prepared as a bio ink for 3D printing to fabricate a nerve guide conduit E Jakus et al 2015 Poly caprolactone PCL is a common polymer frequently used in materials forbiomedical applications Kehoe Zhang and Boyd 2012 The addition of a graphenematerial to PCL as an electrically conducting and biocompatible ller makes numerousapplications possible Evlashin et al 2019 However when graphene materials are

حميدرضا سليمي جزي

مهشيد خرازيها

فتح الله كريم زاده، رحمت الله عمادي، محمد رفيعي نيا