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[IEEE 2018 International Conference on Advanced Science and Engineering (ICOASE) - Duhok (2018.10.9-2018.10.11)] 2018 International Conference on Advanced Science and Engineering (ICOASE) - Manufacturing Procedure of a Hybrid Design of Solar Collector (Sterilization and Water Heating) By Solar and Electrical Energy
摘要： The purpose of the research is to design a hybrid solar collector, called (L1). This Collector operates by solar energy during daylight hours, which is approximately (12) hours, the work of the solar collector (L1) continues during night by using electrical power. Solar collector was tested during the period of December - 2017 to May – 2018.The results were excellent where it’s records high temperature during the period from March - May 2018. Temperature recorded more than 100 Co. The outlet water from the solar collector (L1) was sterilized due to the high heating degree of the water, it reached boiling degree. The design of (L1) is suitable for a lot of environment or weather conditions, because it depends on the collection of the solar radiation in a small surface area; in addition, it works in low electrical power. Tests for (L1) were conducted in Basra city, southern Iraq, on latitude 30.5oN and longitude 47.8oE. Manufacturing of this solar collector is very easy with low cost. It can be used it in houses, scientific and health institutions.
关键词： Hybrid,solar collector,sterilization,Water heating,Renewable energy,Solar energy
更新于2025-09-23 15:22:29
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Prussian blue-encapsulated Fe3O4 nanoparticles for reusable photothermal sterilization of water
摘要： Waterborne health issues continue to grow despite the large number of available solutions. Current sterilization techniques to fight with waterborne diseases struggle to meet the demands on cost, efficiency and reach. Effective alternatives are pressingly required. Here we introduce Prussian blue coated ferroferric oxide (Fe3O4@PB) composites for water sterilization. The composites exhibit superior photothermal inactivation of bacteria under solar-light irradiation, with nearly complete inactivation of bacterial cells in only 15 min. Even for the mixed bacteria in authentic water matrices, the composites show excellent bacterial inactivation performance. Moreover, the highly magnetized iron core of the Fe3O4@PB enables magnetic separation and recycling. Multiple cycle runs reveal that Fe3O4@PB composites have exceptional stability and reusability. This work demonstrates a scalable, low-cost, high-efficiency and reusable sterilization method to improve water quality and safety.
关键词： Solar-light irradiation,Prussian blue,Recyclability,Water security,Photothermal sterilization
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Krakow (2018.10.16-2018.10.18)] 2018 IEEE International Conference on Imaging Systems and Techniques (IST) - Challenges for Electronic Displays in Sterile Medical Devices
摘要： Due to the ongoing digitalization, the demand for additional data is getting more into focus of users and industry. An approach for granting more data and enabling access to additional settings and parameters is since many decades the use of displays. Especially in medical industry, screens became an essential part of the daily work of doctors and medical staff. From patient monitors to blood sugar test devices, displays are present in all shapes and functions. However, these screens are still limited to be used in devices which can’t be sterilized. This is caused by the very harsh conditions of steam sterilizations, the most common type in Europe. Hereby, temperatures up to 135 degree Celsius and 3 bar pressure occur. This work is about the investigation of possible ways to insulate the displays to prevent them from permanent damages due to steam sterilizations and have a look on the possibility of cooling down the modules. For insulation an aerogel based insulation was tested with different LCD, LED and OLED displays. The aim of this research is enabling the use of displays in medical devices which need to be controlled manually and do not give back precise feedback. Therefore, the use of displays could increase safety for patients and usability for doctors significantly.
关键词： sterilization,healthcare,cooling,insulation,displays
更新于2025-09-23 15:22:29
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Development of a new system to collect and dry patient exhalation samples for laser photo-acoustic gas analyzer
摘要： The present work is devoted to the development of a new system for collecting and drying patient exhalation samples for a laser photo-acoustic gas analyzer for express analysis of exhaled air, as well as the possibility of ozone sterilization of the gas tract after use. It is proposed to collect the patient’s exhalation in a disposable sterile plastic bag, place it in a low-temperature freezer chamber to freeze the water vapor, and then transfer part of the dried exhaled sample to the gas analyzer using a disposable syringe. It is proposed to use ozone purge for 10–15 min to sterilize the gas path. Experimentally, it is shown that the water vapor content in the exhalation samples decreased by ~ 20 times when the packet with samples was kept at a temperature of ? 18 °C during 10 min. Cooling the exhalation sample in the packet to – 45 °С and lower will allow reducing the water vapor content at least 200 times from the initial level. A new universal system for collecting and drying of patient exhalation samples for a medical laser photo-acoustic gas analyzer has been developed and tested. A gas path for a medical laser gas analyzer has been designed, which allows sterilization of the internal gas path surfaces using ozone purging.
关键词： Sterilization by ozone flow,Laser photo-acoustic gas analyzer,Drying exhaled patient samples
更新于2025-09-23 15:19:57
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Impact of refractive index increment on the determination of molecular weight of hyaluronic acid by muti-angle laser light-scattering technique
摘要： Hyaluronic acid (HA) is applied in a number of medical applications and HA of different molecular weight (Mw) are used in different pharmaceutical preparations. In determination of Mw by muti-angle laser light-scattering (MALS), refractive index increment (dn/dc) is an important parameter for accuracy. Herein, the influence of dn/dc on the Mw of HA in stroke-physiological saline solution is investigated by MALS in this work. Additionally, the Mw variation of HA in the manufacturing process of preparations is measured. It is shown that each HA sample corresponds to a specific value of dn/dc, which is varied from 1.38 to 1.74 L/g with the Mw increasing from 13.5 to 2840 kDa in solution. It is indicated by the results from both MALS approach and viscometry that appropriate dn/dc should be selected for Mw determination. In steam sterilization process of preparations at 121 °C, the Mw and conformation of HA can be accurately and rapidly determined by MALS. This work provides a precise method to determine the Mw of HA in the medical applications and preparation industries.
关键词： Molecular weight,Viscometry,Muti-angle laser light-scattering,Steam sterilization,Hyaluronic acid,Refractive index increment
更新于2025-09-23 15:19:57
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A Study of the Effect of Anisotropic Gold Nanoparticles on Plasmonic Coupling with a Photosensitizer for Antimicrobial Film.
摘要： Development of antimicrobial surfaces for sterilization is much needed to avoid the spreading of drug resistant bacteria. Light can activate antimicrobial surfaces by an interaction between nanoparticles and a photosensitizer dye, to produce a steady and efficient killing of bacteria. The film studied in this work contains gold nanorods (AuNRs) of 32 nm length and 16 nm diameter and gold nanostars (AuNSs) of 50 nm of diameter, in combination with crystal violet dye (CV). The surface plasmon resonance (SPR) of the nanoparticles used in the film was mathematically simulated and characterized to understand difference SPR between the particles. Their effects on plasmonic coupling with the dye, thus the production of reactive oxygen species (ROS) and consequently the activity of the film against bacteria were studied. The films showed great antimicrobial activity against gram negative bacteria (E. coli) in 4 h of light exposure, when modified with AuNSs, it could kill E. coli in 5 orders of magnitudes (5-log) and the one modified with AuNRs could kill with 4 order of magnitudes (4-log). While maintaining partial activity against gram positive bacteria (S. aureus), i.e. being able to kill in 2.5 orders of magnitudes by the film containing AuNSs and 3 orders of magnitudes by those containing AuNRs. The differential response of gram (-) and gram (+) bacteria to the ROS generated by the films, would allow more targeted approach for specific bacterial species, for example, surfaces of bedpans or common contact surfaces (handles, handrails etc.) that are contaminated principally by gram (-) or gram (+) bacteria, respectively.
关键词： anisotropy,light-activated,non-contact sterilization,antimicrobial surface,simulations,Plasmonic coupling
更新于2025-09-12 10:27:22
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Polarization property of high harmonics generated from nitrogen molecule by bichromatic counter-rotating circularly polarized laser fields
摘要： Along with the rapid appearance of superbacteria with multidrug resistance, it is a challenge to develop new antibacterial materials to address this big issue. Herein, we report a novel amine group-modi?ed fullerene derivative (C70?(EDA)8), which reveals a high performance in killing superbacteria, and most importantly, it shows negligible toxicity to the mammalian cells. The strong antibacterial ability of this material was attributed to its unique molecular structure. On one hand, amino groups on the EDA part make it easy to a?x onto the outer membrane of multidrug resistance Escherichia coli by electrostatic interactions. On the other hand, the hydrophobic surface on the C70 part makes it easy to form a strong hydrophobic interaction with the inner membrane of bacteria. Finally, C70?(EDA)8 is nontoxic for mammalian cells due to di?erent distributions of the negative charges in the cell membrane. In vivo studies indicated that C70?(EDA)8 mitigated bacterial infection and accelerated wound healing by regulating the immune response and secretion of growth factors. Our amine group-based fullerene derivatives are promising for clinical treatment of wound infection and o?er a new way to ?ght against the superbacteria.
关键词： cytoprotection,wound healing,selectivity,superbacteria,sterilization mechanism,amino fullerene
更新于2025-09-11 14:15:04
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Precisely photothermal controlled releasing of antibacterial agent from Bi2S3 hollow microspheres triggered by NIR light for water sterilization
摘要： Microbial contamination in water has evoked worldwide attention owing to their greatest threats to the public safety. In this work, the sea urchin-like Bi2S3 hollow microspheres have been synthesized by a hard template-assisted polyol method using ZnS composite microspheres as sacri?ced template on the large scale, which shows good biocompatibility and photothermal conversion properties. Thermal-sensitive biocompatible 1-tetradecanol (TD) combined antibacterial agents (Linalool) were loaded into the hollow cavity of the sea urchin-like Bi2S3 hollow microspheres to form TD/Linalool@Bi2S3 composites. The Bi2S3 in the TD/Linalool@Bi2S3 composites can convert the absorbed NIR energy into heat energy under the irradiation of near infrared (NIR) light, which would make the temperature to reach the melting point of the TD and Linalool can be released at same time. Thus, the antibacterial agent Linalool can be precisely controlled releasing from the formed TD/Linalool@Bi2S3 composites, which provided rapid and e?ective killing outcome in vitro for Gram-negative Escherichia coli (E. coli) and Gram-positive Stahylococcus aureus (S. aureus). Additionally, the as-prepared TD/Linalool@Bi2S3 composites exhibited superior antibacterial ability as compared to antibacterial agent treatment or photothermal therapy (PTT) alone, which can be attributed to the synergistic e?ects of the NIR light driven photothermal killing and antibacterial agent releasing. It endowed that the designed TD/Linalool@Bi2S3 composites is a promising antibacterial platform for cleaning the microbial contaminated water environment, which is of great strategic signi?cance and remains a formidable challenge for practical applications.
关键词： Water sterilization,Bi2S3 hollow microspheres,Antibacterial,NIR light responsive,Precisely controlled delivery
更新于2025-09-11 14:15:04
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Sterilization for Bacillus Subtilis var. natto by Low Pressure Sputtering and Laser Ablation Plasma using Metal Powder Target
摘要： Effect of plasma sterilization for bacillus subtilis var. natto was studied using pulsed laser ablation and low pressure RF plasma, which usually used for functional thin film deposition. In addition, bulk and powder were used as the targets and compared the effect for the sterilization . Experimental results suggest that bacillus subtilis var. natto was not sterilized in the only vacuum state. However, they can be sterilized using low pressure RF plasma and pulsed laser ablation plasma irradiation. The effect of the sterilization using powder target was higher than that of bulk target, and that of the pulsed laser ablation plasma was higher than RF plasma. Those results suggest that the effect of sterilization was decided by the density of the high-energy metal atoms and ions.
关键词： plasma sterilization,plasma process,pulsed laser ablation
更新于2025-09-11 14:15:04
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Hybrid Plasmonic Photoreactors as Visible Light-Mediated Bactericides
摘要： Photocatalytic compounds and complexes, such as tris(bipyridine)ruthenium(II), [Ru(bpy)3]2+, have recently received attention as light-mediated bactericides that can help to address the need for new antibacterial strategies. We demonstrate in this work that the bactericidal efficacy of [Ru(bpy)3]2+ and the control of its antibacterial function can be significantly enhanced through combination with a plasmonic nanoantenna. We report strong, visible light-controlled bacterial inactivation with a nanocomposite design that incorporates [Ru(bpy)3]2+ as photocatalyst and a Ag nanoparticle (NP) core as light-concentrating nanoantenna into a plasmonic hybrid photoreactor. The hybrid photoreactor platform is facilitated by a self-assembled lipid membrane that encapsulates the Ag NP and binds the photocatalyst. The lipid membrane renders the nanocomposite biocompatible in the absence of resonant illumination. Upon illumination, the plasmon-enhanced photoexcitation of the metal-to-ligand-charge-transfer band of [Ru(bpy)3]2+ prepares the reactive excited state of the complex that oxidizes the nanocomposite membrane and increases its permeability. The photooxidation induces the release of [Ru(bpy)3]2+, Ag+, and peroxidized lipids into the ambient medium, where they interact synergistically to inactivate bacteria. We measured seven orders of magnitude decrease in Gram-positive Arthrobacter sp. and four orders of magnitude decrease in Gram-negative Escherichia coli (E. coli) colony forming units (CFUs) with the photoreactor bactericides after 1-hour of visible light illumination. In both cases the photoreactor exceeds the bactericidal standard of a log reduction value (LRV) of 3, and surpasses the antibacterial effect of free Ag NPs or [Ru(bpy)3]2+ by more than four orders of magnitude. We also implement the inactivation of a bacterial thin film in a proof-of-concept study.
关键词： antibiotics,biofilm,controlled release,sterilization,photocatalyst,antibacterial,nanoantenna
更新于2025-09-11 14:15:04