With Al foil,Cu foil and steel mesh as the metal interlayers,respectively,three types of alumina/epoxy/metal laminated composites were fabricated with epoxy resin adhesive as a binder via a simple process.The impact t...With Al foil,Cu foil and steel mesh as the metal interlayers,respectively,three types of alumina/epoxy/metal laminated composites were fabricated with epoxy resin adhesive as a binder via a simple process.The impact tests were performed and the fracture patterns and impact response of all the three laminates were analyzed.The experimental results indicate that the absorbed energy is mainly determined by metal interlayer.The peak load depends on not only alumina substrate but also metal interlayer.The Al2O3/epoxy/Cu laminates sustain the maximum peak load and Al2O3/epoxy/steel mesh laminates have the largest threshold energy for penetration.The fracture analysis shows that the main damage modes are Al2O3 matrix cracking and metal deformation for lower impact energies,and complete breakage and penetration for higher impact energies.展开更多
The arch wire(AW)plays an important role in providing continuous force,aligning the teeth,and excellent dental arch stability for orthodontic treatment.However,the high friction performance of the AW surface can incre...The arch wire(AW)plays an important role in providing continuous force,aligning the teeth,and excellent dental arch stability for orthodontic treatment.However,the high friction performance of the AW surface can increase bacterial adhesion and colonization,leading to oral hygiene problems.Herein,a simple method is developed to modify the surface of the orthodontic wire with a poly(vinyl alcohol)(PVA)hydrogel coating,which can improve the lubricity and antibacterial adhesion of the AW and prevent the oral hygiene problems caused by itself.The PVA hydrogel coating can toughly adhere to the surface of the AW and remarkably reduce the friction performance of the AW,and then its friction coefficient in water can reach 0.005.Under the action of brushing and bending,the PVA hydrogel coating possesses superior ultralubrication and hardly affects the mechanical properties of the stainless-steel substrate.Moreover,the PVA hydrogel coating can significantly inhibit bacterial adhesion on the surface of the AW,thereby reducing bacterial colonization and maintaining oral hygiene while correcting the shape of the mouth and jaw.Therefore,the PVA hydrogel coating exhibits tough adhesion and good antibacterial adhesion while maintaining the mechanical properties of the AW,and it is a promising antifouling coating for improving the performance of the AW.展开更多
基金Funded by the Science and Technology Program of Guangdong Province of China(No.2012B091000107)the Subproject of China Education&Equipment Resource System(No.CERS-1-2)
文摘With Al foil,Cu foil and steel mesh as the metal interlayers,respectively,three types of alumina/epoxy/metal laminated composites were fabricated with epoxy resin adhesive as a binder via a simple process.The impact tests were performed and the fracture patterns and impact response of all the three laminates were analyzed.The experimental results indicate that the absorbed energy is mainly determined by metal interlayer.The peak load depends on not only alumina substrate but also metal interlayer.The Al2O3/epoxy/Cu laminates sustain the maximum peak load and Al2O3/epoxy/steel mesh laminates have the largest threshold energy for penetration.The fracture analysis shows that the main damage modes are Al2O3 matrix cracking and metal deformation for lower impact energies,and complete breakage and penetration for higher impact energies.
基金Excellent Youth Fund Project of Henan Natural Science Foundation(Grant No.202300410166)the National Natural Science Foundation of China(Grant No.22202051)+2 种基金the Major Project of WIUCAS(Grant Nos.WIUCASQD2021004 and WIUCASQD2021035)the Project of Wenzhou Key Lab(Grant No.2021HZSY0069)the Science Foundation of Oujiang Laboratory(Grant No.OJQDSP2022018)。
文摘The arch wire(AW)plays an important role in providing continuous force,aligning the teeth,and excellent dental arch stability for orthodontic treatment.However,the high friction performance of the AW surface can increase bacterial adhesion and colonization,leading to oral hygiene problems.Herein,a simple method is developed to modify the surface of the orthodontic wire with a poly(vinyl alcohol)(PVA)hydrogel coating,which can improve the lubricity and antibacterial adhesion of the AW and prevent the oral hygiene problems caused by itself.The PVA hydrogel coating can toughly adhere to the surface of the AW and remarkably reduce the friction performance of the AW,and then its friction coefficient in water can reach 0.005.Under the action of brushing and bending,the PVA hydrogel coating possesses superior ultralubrication and hardly affects the mechanical properties of the stainless-steel substrate.Moreover,the PVA hydrogel coating can significantly inhibit bacterial adhesion on the surface of the AW,thereby reducing bacterial colonization and maintaining oral hygiene while correcting the shape of the mouth and jaw.Therefore,the PVA hydrogel coating exhibits tough adhesion and good antibacterial adhesion while maintaining the mechanical properties of the AW,and it is a promising antifouling coating for improving the performance of the AW.
