title: Mullins effect behaviour under compression in micelle-templated silica and micelle-templated silica/agarose systems.
abstract: The mechanical properties of bioceramic conformed pieces based on micelle-templated silica (MTS) such as SBA15, MCM41 and MCM48 as well as MTS/agarose systems have been evaluated under static and cyclic compressive tests. The MTS pieces exhibited a brittle behaviour. Agarose, a biocompatible and biodegradable hydrogel, has been used to shape ceramic-agarose pieces following a low temperature shaping method. Agarose conferred toughness, ductility and a rubbery consistency up to a 60% strain in ceramic MTS/agarose systems leading to a maximum strength of 10-50 MPa, without losing their initial cylindrical structure. This combination of ceramic and organic matrix contributes to avoiding the inherent brittleness of the bioceramic and enhances the compression resistance of hydrogel. The presence of mechanical hysteresis, permanent deformation after the first cycle and recovery of the master monotonous curve of MTS/agarose systems indicate a Mullins-like effect similar to that found in carbon-filled rubber systems. We report this type of mechanical behaviour, the Mullins effect, for the first time in MTS bioceramics and MTS bioceramic/agarose systems.
authors.affiliation: Department of Materials Science and Technology, Instituto de Investigaciones en Ingeniería de Aragón, I3A, Universidad de Zaragoza, Zaragoza, Spain.
authors.forename: J A
authors.initials: JA
authors.lastname: Puértolas
authors.forename: J L
authors.initials: JL
authors.lastname: Vadillo
authors.forename: S
authors.initials: S
authors.lastname: Sánchez-Salcedo
authors.forename: A
authors.initials: A
authors.lastname: Nieto
authors.forename: E
authors.initials: E
authors.lastname: Gómez-Barrena
authors.forename: M
authors.initials: M
authors.lastname: Vallet-Regí
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry; D019245:Compressive Strength; D020100:Hydrogels / Q000737:chemistry; D008422:Materials Testing; D055595:Mechanical Phenomena; D008823:Micelles; D008855:Microscopy, Electron, Scanning / Q000379:methods; D009930:Organic Chemicals / Q000737:chemistry; D011312:Pressure; D012408:Rubber / Q000737:chemistry; D012685:Sepharose / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013314:Stress, Mechanical; D013696:Temperature
chemical_list: D001672:Biocompatible Materials; D020100:Hydrogels; D008823:Micelles; D009930:Organic Chemicals; D002244:Carbon; D012822:Silicon Dioxide; D012408:Rubber; D012685:Sepharose
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