Air sanitization acquired renewed interest during the COVID-19 outbreak, especially in hospital rooms and intensive care units. In this work, mathematical analysis was done of the convenience of sanitizing the air of ...Air sanitization acquired renewed interest during the COVID-19 outbreak, especially in hospital rooms and intensive care units. In this work, mathematical analysis was done of the convenience of sanitizing the air of whole rooms or personalized isolation tents. Centralized air sanitization was found to have low effectiveness due to three reasons: 1) the constant virus emission from patients;2) the practical upper limits of air recycle flowrates;3) the low value of the minimum infective dose of SARS-CoV-2. Personalized air sanitization was the best option. Virus inactivation by thermal effect was then revisited, and a steady-state model was formulated for an efficient and personalized thermal sterilizer. An analytical solution was obtained for temperature and virus concentration in different parts of the sterilizer. Cell temperature was found to be the main variable for sterilization due to the Arrhenius-like form of the kinetic constant of virus deactivation. An objective cost function was written and subjected to conditions of minimum patient ventilation rate and minimum virus removal effectiveness. Numerical optimization gave an optimal design with the intrinsic advantages of thermal sanitization, i.e., simplicity, robustness, minimum maintenance and high sanitization rate.展开更多
Photothermal packaging materials are utilized for the thermal sterilization of food.However,these materials are usually constructed from precious metals or inorganic nanoparticles,which leads to concern about their sa...Photothermal packaging materials are utilized for the thermal sterilization of food.However,these materials are usually constructed from precious metals or inorganic nanoparticles,which leads to concern about their safety and environmental impact.This study presents a cost-effective,sustainable photothermal packaging solution using agricultural waste-derived purple corn cob extract(PCCE),ferric ions,and biodegradable chitosan(CS).A simple one-pot method was employed to create CS-PCCE/Fe composite films that exhibit high photothermal efficiency.The PCCE/Fe complex was prepared by mixing PCCE containing anthocyanins with ferric ions,and then this PCCE/Fe complex was mixed with CS to form the CS-PCCE/Fe composite film.Microstructural analysis revealed that the PCCE/Fe complex was uniformly dispersed in the CS matrix,enhancing the films’tensile strength,water vapor barrier property,and thermal stability.In vitro tests showed potent antibacterial activity against Escherichia coli and Staphylococcus aureus.A 24-day storage test demonstrated that cherry tomatoes wrapped in the CS-PCCE/Fe photothermal film had less weight loss,pH change,and hardness reduction compared to those wrapped in polyethylene(PE)and CS films,indicating superior quality preservation.These results suggest that the CS-PCCE/Fe composite film offers a promising,environmentally friendly solution for food packaging with enhanced thermal sterilization and improved shelf-life extension.展开更多
The authors regret a correction in the Acknowledgements section as below:This work was supported by the Shandong Province small and medium-sized scientific and technological enterprises innovation capacity improvement...The authors regret a correction in the Acknowledgements section as below:This work was supported by the Shandong Province small and medium-sized scientific and technological enterprises innovation capacity improvement project(No.2025TSGCCZZB0777),Natural Sci-ence Foundation of Shandong Province(ZR2023QC111,ZR2024MC145).The authors would like to apologise for any inconvenience caused.展开更多
文摘Air sanitization acquired renewed interest during the COVID-19 outbreak, especially in hospital rooms and intensive care units. In this work, mathematical analysis was done of the convenience of sanitizing the air of whole rooms or personalized isolation tents. Centralized air sanitization was found to have low effectiveness due to three reasons: 1) the constant virus emission from patients;2) the practical upper limits of air recycle flowrates;3) the low value of the minimum infective dose of SARS-CoV-2. Personalized air sanitization was the best option. Virus inactivation by thermal effect was then revisited, and a steady-state model was formulated for an efficient and personalized thermal sterilizer. An analytical solution was obtained for temperature and virus concentration in different parts of the sterilizer. Cell temperature was found to be the main variable for sterilization due to the Arrhenius-like form of the kinetic constant of virus deactivation. An objective cost function was written and subjected to conditions of minimum patient ventilation rate and minimum virus removal effectiveness. Numerical optimization gave an optimal design with the intrinsic advantages of thermal sanitization, i.e., simplicity, robustness, minimum maintenance and high sanitization rate.
基金supported by the Key Research and Development Program of Shaanxi Province(No.S2025-YF-YBNY-0141)Northwest A&F University Experimental Technology Research and Laboratory Management Innovation Project(SY20250208).
文摘Photothermal packaging materials are utilized for the thermal sterilization of food.However,these materials are usually constructed from precious metals or inorganic nanoparticles,which leads to concern about their safety and environmental impact.This study presents a cost-effective,sustainable photothermal packaging solution using agricultural waste-derived purple corn cob extract(PCCE),ferric ions,and biodegradable chitosan(CS).A simple one-pot method was employed to create CS-PCCE/Fe composite films that exhibit high photothermal efficiency.The PCCE/Fe complex was prepared by mixing PCCE containing anthocyanins with ferric ions,and then this PCCE/Fe complex was mixed with CS to form the CS-PCCE/Fe composite film.Microstructural analysis revealed that the PCCE/Fe complex was uniformly dispersed in the CS matrix,enhancing the films’tensile strength,water vapor barrier property,and thermal stability.In vitro tests showed potent antibacterial activity against Escherichia coli and Staphylococcus aureus.A 24-day storage test demonstrated that cherry tomatoes wrapped in the CS-PCCE/Fe photothermal film had less weight loss,pH change,and hardness reduction compared to those wrapped in polyethylene(PE)and CS films,indicating superior quality preservation.These results suggest that the CS-PCCE/Fe composite film offers a promising,environmentally friendly solution for food packaging with enhanced thermal sterilization and improved shelf-life extension.
文摘The authors regret a correction in the Acknowledgements section as below:This work was supported by the Shandong Province small and medium-sized scientific and technological enterprises innovation capacity improvement project(No.2025TSGCCZZB0777),Natural Sci-ence Foundation of Shandong Province(ZR2023QC111,ZR2024MC145).The authors would like to apologise for any inconvenience caused.
