Behavioral effects of zinc oxide nanoparticles on the brain of rats

In this work, large 3D Ti meshes fabricated by direct ink writing were wirelessly anodized for the first time to prepare highly photocatalytically active TiO2 nanotube (TNT) layers. The use of bipolar electrochemistry enabled the fabrication of TNT layers within the 3D Ti meshes without the establishment of an electrical contact between Ti meshes and the potentiostat, confirming its unique ability and advantage for the synthesis of anodic structures on metallic substrates with a complex geometry. TNT layers with nanotube diameters of up to 110 nm and thicknesses of up to 3.3 μm were formed. The TNT-layer-modified 3D Ti meshes showed a superior performance for the photocatalytic degradation of methylene blue in comparison to TiO2-nanoparticle-decorated and nonanodized Ti meshes (with a thermal oxide layer), resulting in multiple increases in the dye degradation rate. The results presented here open new horizons for the employment of anodized 3D Ti meshes in various flow-through (photo)catalytic reactors.

Anodic TiO2 Nanotubes on 3D-Printed Titanium Meshes for Photocatalytic Applications.

Three dimensional printing (3DP), or additive manufacturing, is an exponentially growing process in the fabrication of various technologies with applications in sectors such as electronics, biomedical, pharmaceutical and tissue engineering. Micro and nano scale printing is encouraging the innovation of the aforementioned sectors, due to the ability to control design, material and chemical properties at a highly precise level, which is advantageous in creating a high surface area to volume ratio and altering the overall products’ mechanical and physical properties. In this review, micro/-nano printing technology, mainly related to lithography, inkjet and electrohydrodynamic (EHD) printing and their biomedical and electronic applications will be discussed. The current limitations to micro/-nano printing methods will be examined, covering the difficulty in achieving controlled structures at the miniscule micro and nano scale required for specific applications.

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High Precision 3D Printing for Micro to Nano Scale Biomedical and Electronic Devices

Direct ink writing of aluminum-phosphate-bonded Al2O3 ceramic with ultra-low dimensional shrinkage

With the development of three-dimensional (3D) printed technology, 3D printed alloy implants, especially titanium alloy, play a critical role in biomedical fields such as orthopedics and dentistry. However, untreated titanium alloy implants always possess a bioinert surface that prevents the interface osseointegration, which is necessary to perform surface modification to enhance its biological functions. In this article, we discuss the principles and processes of chemical, physical, and biological surface modification technologies on 3D printed titanium alloy implants in detail. Furthermore, the challenges on antibacterial, osteogenesis, and mechanical properties of 3D-printed titanium alloy implants by surface modification are summarized. Future research studies, including the combination of multiple modification technologies or the coordination of the structure and composition of the composite coating are also present. This review provides leading-edge functionalization strategies of the 3D printed titanium alloy implants.

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Advanced Surface Modification for 3D-Printed Titanium Alloy Implant Interface Functionalization

Effective and fast osseointegration is significantly affected by the topographic features and chemical compositions of titanium (Ti)-based orthopedic implants. In this study, strontium (Sr) ions fu...

Fabrication of Sr-functionalized micro/nano-hierarchical structure ceramic coatings on 3D printing titanium

Sr-containing micro/nano-hierarchical textured TiO2 nanotubes on 3D printing titanium

Self-healing materials as type of promising smart materials, are gradually applied into electronics, biology, engineering. In this work, we use in-situ polymerization to make melamine-formaldehyde resin (MF) microcapsules to wrap the epoxy resin as repairing agent, and Cu(MI)4Br2 as latent curing agent to cure epoxy resin E-51 from broken melamine-formaldehyde resin (MF) microcapsules. In addition, graphene oxide is used as reinforcing phase through its two-dimensional layered structure to improve the tensile strength to 41.91 MPa, which is higher than the initial materials. The melamine-formaldehyde capsules and latent curing agents are uniformly distributed in the materials according to the digital photos and SEM pictures. It is worth noting that the mechanical strength of the broken materials can be restored to 35.65 MPa after heating at 130 °C for 2 h to repair the damage, and the self-healing efficiency reached up to 85.06%. Furthermore, we also fabricated the 4D printed material with tensile strength of 50.93 MPa through a 3D printer. The obtained materials showed excellent repair effect with the recovery rate up to 87.22%. This work confirms that the designed self-healing system have potential applications in many areas due to their excellent self-healing performance, which provides valuable guidance for designing 4D system.

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Graphene Oxide-Modified Microcapsule Self-Healing System for 4D Printing

Construction of Zn-incorporated Micro/Nano Hierarchical Structure Coatings on Tantalum

The invention discloses a ZIF-8@antibacterial ionic coating prepared on the surface of a metal medical implant material and a preparation method of the ZIF-8@antibacterial ionic coating, and belongs to the technical field of biological materials. Antibacterial ions (Sr , Mg , Ag and Cu ) and zeolite imidazolate framework structure materials (ZIFs) are effectively combined and successfully compounded on the surface of a metal medical implant material substrate. Due to the fact that the metal medical implant material substrate has good biocompatibility, the ZIF-8@antibacterial ion coating doped with the antibacterial ions is prepared on the surface of the metal medical implant material substrate, the advantages of the three components are successfully combined, and therefore, thecomposite material has the antibacterial effect while having relatively high biological activity. And the ZIF-8@antibacterial ionic coating prepared by the method is uniformly dispersed on the surface of the metal medical implant material, has good affinity with water, and is beneficial to adhesion of osteoblasts on the surface of the metal medical implant material. By changing the types of dopedatoms, the antibacterial effect of the material under specific conditions can be maximized, and human cells are not damaged.

Mingrui Li

Papers

Fabrication of Sr-functionalized micro/nano-hierarchical structure ceramic coatings on 3D printing titanium

Sr-containing micro/nano-hierarchical textured TiO2 nanotubes on 3D printing titanium

Graphene Oxide-Modified Microcapsule Self-Healing System for 4D Printing

Construction of Zn-incorporated Micro/Nano Hierarchical Structure Coatings on Tantalum

ZIF-8@antibacterial ionic coating prepared on surface of metal medical implant material and preparation method of ZIF-8@antibacterial ionic coating