Effect of dye-metal complexation on photocatalytic decomposition of the dyes on TiO_2 under visible irradiation

The photocatalytic degradation of dyes （Acid Chrome Blue K （ACBK） and Alizarin Red （AR）） with strong complexation ability was investigated in the presence of metal ions under visible light irradiation. It was found that, at low dye-metal ratio, the photodegradation of ACBK was markedly inhibited by the addition of high oxidative potential Cu2＋. However, at high dye-metal ratio, the presence of Cu2＋ enhanced the photodegradation of ACBK. The negtive effect of Cu2＋ on the photodegradation of AR was observed for all dyemetal ratios. The relative chemical inert Zn2＋ tended to enhance the photodegradation of both anionic dyes. The mechanism underlying the different effect of Cu2＋ was discussed from the different roles of surface-adsorbed and dye-coordinated Cu2＋ in the photodegradation of dyes.

Quality of reporting and adherence to the ARRIVE guidelines 2.0 for preclinical degradable metal research in animal models of bone defect and fracture:a systematic review

In vivo testing is crucial for the evaluation of orthopedic implant efficacy and safety.However,the translation and reproducibility of preclinical animal experiments are not always satisfactory,and reporting quality is among the essential factors that ensure appropriate delivery of information.In this study,we assessed the reporting quality of in vivo investigations that examined the use of degradable metal materials in fracture or bone defect repair.We employed scientific databases,such as PubMed,EMBASE,Web of Science,Cochrane Library,CNKI,WanFang,VIP and Sinomed to screen for in vivo investigations on fracture or bone defect repair using degradable metal materials,and extracted both epidemiological and main characteristics of eligible studies,and assessed their reporting quality using the ARRIVE guidelines 2.0.Overall,263 publications were selected,including 275 animal experiments.The overall coincidence rate of Essential 10(22 sub-items)and Recommended Set(16 sub-items)were 42.0%and 41.5%,respectively.Based on our analysis,the reporting quality of the published in vivo investigations examining fracture/bone defect repair with degradable metal materials was low,and there was a lack of transparent,accurate and comprehensive reporting on key elements of the experimental design and other elements that are meant to avoid bias.

A comprehensive review on metallic biomaterials for airway stenosis repair

In recent years,the incidence of airway stenosis in respiratory diseases increases year by year.Among many treatment methods,tracheal stent implantation is a very effective way.Metallic stents have been the first choice for tracheal stent implantation due to their excellent mechanical properties,low rate of migration,and minimal effect on the ciliary movement of the trachea.In this paper,the research progress of metal tracheal stents is introduced in detail from three aspects of mechanical properties,degradation properties,and biocompatibility,including traditional inert metallic tracheal stents and new degradable metallic tracheal stents,and its future research and development are prospected:although the current research on biodegradable metal tracheal stents is still in its infancy,with only some studies of magnesium-based,iron-based,and zinc-based tracheal stents,they are considered as the best material for preparing future metal tracheal scaffolds considering their biodegradability and biocompatibility.

Optimization of mechanical properties and corrosion resistance of Zn-0.4Mn-0.8Li alloy using the hot rolling process

Zinc-based degradable metals are considered one of the most promising biodegradable materials due to their moderate corrosion rate,excellent mechanical properties,and good biocompatibility.In this work,biodegradable Zn-0.4Mn-0.8Li alloy was fabricated and rolled in multiple passes at different tem peratures.As the hot rolling temperature increases,the grain size of Zn-0.4Mn-0.8Li alloy was found to increase cor-respondingly.Further,a multi-scale structure with the coexistence of coarse grains and fine grains was obtained.The results demonstrated that the mechanical strength and corrosion resistance were improved by increasing the rolled temperature.It was observed that Zn-0.4Mn-0.8Li alloy with a total reduction of 90%after hot rolling at 325℃ exhibited excellent mechanical and corrosion properties.The cooperation of multi-scale microstructure and twinning was found to improve the strength and guarantee the duc-tility of Zn-0.4Mn-0.8Li alloy significantly so that the 325℃ hot-rolled Zn-0.4Mn-0.8Li alloy has optimal comprehensive properties.Further,yield strength,ultimate tensile strength,and elongation were found to be 449.7±5.3 MPa,505.1±6.5 MPa,and 40.5%±7.5%,respectively.Meanwhile,Zn-0.4Mn-0.8Li al-loy via 325℃ hot-rolled processes also exhibited excellent corrosion resistance.The corrosion current density and corrosion potential were found to be 8.8×10-5 mA cm^(-2)and−0.929 V,respectively.The preliminary study indicates that Zn-0.4Mn-0.8Li alloy is a promising candidate material for medical de-vice applications.

In vitro and in vivo degradability,biocompatibility and antimicrobial characteristics of Cu added iron-manganese alloy

In recent years,iron(Fe)based degradable metal is explored as an alternative to permanent fracture fixation devices.In the present work,copper(Cu)is added in Fe-Mn system to enhance the degradation rate and antimicrobial properties.Fe-Mn-x Cu(x=0.9,5 and 10 wt.%)alloys are prepared by the meltingcasting-forging route.XRD analysis confirms austenite phase stabilization due to the presence of Mn and Cu.As predicted by Thermo-Calc calculations,Cu rich phase precipitations are noticed along the austenite grain boundaries.Degradation behaviours of Cu added Fe-Mn alloys are investigated through static immersion and electrochemical polarization where enhanced degradation is found for higher Cu added alloys.When challenged against E.Coli bacteria,the Fe-Mn-Cu alloy media extract shows a significant bactericidal effect compare to the base alloy.In vitro cytocompatibility studies,as determined using MG63 and MC3T3-E1 cell lines,indicate increased cell density as a function of time for all the alloys.When implanted in rabbit femur,the newly developed alloy does not show any kind of tissue necrosis around the implants.Better osteogenesis and higher new bone formation are observed with Fe-Mn-10 Cu alloy as evident from micro-computed tomography(μ-CT)and fluorochrome labelling.