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Antibacterial activity of Fe-doped ZnO nanoparticles synthesised via pulsed laser ablation in liquid against <i>Staphylococcus Aureus</i>
摘要： Pulse laser ablation in liquid (PLAL) technique has been performed in pure water as the solution to produce ZnO and Fe-doped ZnO nanoparticles, by varying Fe ablation time 5, 10 and 15 min. The characterisation was carried out using UV–vis spectrometer, photoluminescence 325 spectrometer, X-Ray diffraction, and high resolution-transmission electron microscopy (HR-TEM). The band gap energy was found to be 3.18 eV for pure ZnO and it was decreased down to 2.86 eV for ZnO for the highest Fe concentration. The shape and size, which were obtained from TEM, showed no significant change of ZnO nanoparticles with and without Fe addition. All samples were tested to inactivate Staphylococcus aureus (S. aureus) growth, which shows promising antibacterial properties as they are able to inactivate bacteria under normal ambient laboratory light, especially Fe-doped ZnO which is able to reduce more bacteria than pure ZnO.
关键词： ZnO,antibacterial,Fe-ZnO,nanoparticles,laser ablation
更新于2025-09-23 15:21:01
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Quantum dots encapsulated with curcumin inhibit the growth of colon cancer, breast cancer and bacterial cells
摘要： Aim: To synthesize and examine the impact of free Eudragit R(cid:2) RS 100 nanoparticles (LN01), Quantum dots curcumin-loaded Eudragit RS 100 nanoparticles (LN04), and un-encapsulated curcumin nanoparticles (LN06) on cancerous and bacterial cells. Materials & methods: The LN01, LN04, LN06 were synthesized and characterized by Fourier transform infrared, ζ potential, UV–Vis spectroscopy, transmission electron microscopy and scanning electron microscopy and their biological activities were evaluated. Results: LN04 profoundly inhibited the growth of colon (HCT-116) cancerous cells (10.64% cell viability) and breast cancer (MCF-7) cells (10.32% cell viability) with compared to LN01 and LN06. Normal cells (HEK-293) did not show any inhibition after treatments. In addition, LN04 show better inhibitory action on bacterial growth compared with LN01 and LN06. Conclusion: We suggest that LN04 selectively target cancerous and bacterial cells and therefore possess potential anticancer and antibacterial capabilities.
关键词： quantum dots,curcumin,antibacterial agent,drug delivery,anticancer agent
更新于2025-09-23 15:21:01
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Carbon quantum dots decorated on ZnO nanoparticles: An efficient visiblea??light responsive antibacterial agents
摘要： Zinc oxide@carbon quantum dots (ZnO@CQDs) nanocomposite was prepared via a facile hydrothermal method. Characterization of the obtained samples was carried out by Scanning electron microscopy-EDX(SEM–EDX), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Photoluminescence (PL), and Fourier transformed infrared spectroscopy (FT-IR). These results revealed that we have prepared ZnO@CQDs nanocomposite successfully. Our study revealed that the antibacterial efficiency (against S.aureus and E.coli) under visible light irradiation of as prepared ZnO@CQDs nanocomposite was higher than pure ZnO nanoparticles. The ZnO@CQDs nanocomposite showed excellent antibacterial activity against Gram-negative and Gram-positive bacteria with a minimal inhibitory concentration (6–8 mg/mL) against to E.coli and S.aureus. We also tested the light response of ZnO@CQDs under UV–vis light, by calculating its band gap data, after decorated with CQDs, the band gap of the pure ZnO can significantly decreased from 2.57 eV to 2.50 eV. The ZnO decorated by CQDs can both enhance the light absorption and suppress photogenerated electron–hole's recombination which results in the enhancement of antibacterial properties.
关键词： ZnO,carbon quantum dots,antibacterial
更新于2025-09-23 15:21:01
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Nanosecond laser ablation assisted the enhancement of antibacterial activity of copper oxide nano particles embedded though Polyethylene Oxide/Polyvinyl pyrrolidone blend matrix
摘要： Via one-step Laser Ablation process, different contributions of copper oxide nanoparticles (CuONPs) were scattered through Polyethylene Oxide (PEO)/Polyvinyl pyrrolidone (PVP) blend matrix. The obtained films were characterized via XRD and FTIR. Their micro-structural features and morphological behaviors were investigated using TEM and FESEM. The CuONPs were formed in a spherical shapes with dimensions around 50 nm in case of processing time 5.0 min, while their size was deteriorated at t=25.0 min to be around 30 nm upon TEM micrographs. In addition, surface roughness average was enhanced from 26.0 nm at no contribution of CuONPs reaching to 37.0 nm at the highest content. The composite films displayed antibacterial activity against E. coli and S. aureus upon CuONPs contribution. The antibacterial activity jumped from no effect at no-contribution of CuONPs to be around 89– 4 % and 82– 3 % against E. coli and S. aureus respectively at their highest contribution. Therefore, it could be seen that these films were carried out using facile method and displayed a great effectiveness through biological environment which could encourage more investigations for these compositions to be suggested for wound healing applications.
关键词： PVP,laser ablation,Antibacterial,CuONPs,PEO
更新于2025-09-23 15:21:01
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Antibacterial activity of ZnO nanoparticles fabricated using laser ablation in solution technique
摘要： The zinc oxide (ZnO) nanoparticles have been produced by using laser ablation in solution technique, resulting nanoparticles with hexagonal wurtzite structure and the size range of 20 – 50 nm. The optical characterization has predicted the nanoparticles band gap at least 3.16 eV. The ZnO nanoparticles were employed as an antibacterial agent for the growth of Escherichia coli (E. coli), and it shows a great potential. Total plate count (TPC) analysis was conducted by applying the ZnO nanoparticles with different concentration of 5%, 10%, 15%, 20%, 25% and 30% (portion of bacteria medium). The 5% concentration could reduce more than half of the E. coli population after 24 hours incubation time. There was no living bacteria detected for 20%, 25% and 30% ZnO concentration.
关键词： ZnO nanoparticles,laser ablation,antibacterial activity,Escherichia coli
更新于2025-09-23 15:19:57
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Silver and copper oxide nanoparticles-decorated graphene oxide via pulsed laser ablation technique: Preparation, characterization, and photoactivated antibacterial activity
摘要： Graphene oxide, silver and copper oxide nanoparticles display photoactivated antibacterial behavior owing to their ability to generate charge carriers via light exposure. In this work, silver nanoparticles (AgNPs) and copper oxide nanoparticles (CuONPs) were embedded through graphene oxide (GO) using laser ablation technique. The microstructural behavior of the synthesized compositions has been investigated via XRD and TEM. The optical properties were studied by (UV–Vis), while the antibacterial properties were investigated in addition to the cell viability towards normal cell line (HFB4) in vitro. The antibacterial activity of GO was enhanced significantly with addition nanoparticles; by meaning, the inhibition zone enlarged from 5.4 mm with pure GO to be around 11.2 mm against E. coli with contribution of CuONPs. This trend of enhancement suggests that GO could be a great platform for different kinds of photo-activated antibacterial to be recommended for versatile biomedical applications.
关键词： CuO,Ag,Pulsed laser ablation,Graphene oxide,Antibacterial activity,Bacterial resistance
更新于2025-09-23 15:19:57
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Effect of Polymer Capping on Photonic Multi-Corea??Shell Quantum Dots CdSe/CdS/ZnS: Impact of Sunlight and Antibacterial Activity
摘要： The highly luminescent CdSe/CdS/ZnS core?multi-shell quantum dots (QDs) were prepared without a protective atmosphere through the precursor injection method (phosphine free) in paraffin liquid and oleic acid. Polymers (PEG, PVA, PVP, and PAA) were coated to CdSe/CdS/ZnS core?multi-shell quantum dots to increase stability. However, core?multi-shell structured QDs reveal enhanced emission in the range 355?410 nm by suppressing the defect sensitive cores and nonradioactive recombination in PL spectra. The cubic zinc blended quantum dots with crystallite size in the range 22?44 nm, as confirmed by XRD, were obtained. The resultant absorption spectra of all the samples showed that the samples were absorbent in the UV region over the 302?380 nm range. In the FT-IR spectrum 712, 731, and 400?700 cm?1 band values were assigned to CdSe, CdS, and ZnS band stretching, respectively. Images of CdSe, CdSe/CdS, and CdSe/CdS/ZnS quantum dots obtained from the SEM were spherical whereas QDs capped with different polymers (PEG, PVA, PVP, and PAA) showed nanofibers that were linear and homogeneous size ranged between 12 and 38 nm. These as prepared QDs were placed under visible light for 48 h. After absorbing UV light, the range of UV?vis intensity was enhanced until 389?464 nm and emission intensity enhanced until 492?509 nm, which was confirmed by UV and PL spectra. CdSe/CdS/ZnS QDs with organic ligands revealed antibacterial activity over a broad range against Klebsiella Pneumoniae and Pseudomonas aeruginosa.
关键词： CdSe/CdS/ZnS,Photoluminescence,Polymer capping,Quantum dots,Antibacterial activity
更新于2025-09-23 15:19:57
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Efficacy of cellulose paper treated with Cu and Ag oxide nanoparticles synthesized via pulsed laser ablation in distilled water in the annihilation of bacteria from contaminated water
摘要： In the present work, nanoparticles of copper and silver synthesized via pulsed laser ablation of the respective targets in distilled water are applied to cellulose filter paper to check their effectiveness in the annihilation of bacteria from contaminated water. The treatment of the filter paper with the nanoparticles is found to be an excellent way to get rid of two common bacteria, Staphylococcus aureus and Escherichia coli, from contaminated water. The spread plate method on agar, employed to test the antibacterial efficacy of the nanoparticle-treated papers, clearly shows the absence of bacterial growth upon coming into contact with the nanoparticles in the filter paper. These results were further substantiated by the growth kinetic study of the bacteria that exhibited slow growth of the bacteria that were exposed to the nanoparticles. The morphology of the bacteria that came into contact with the nanoparticles is found to be adversely affected by the nanoparticles. Both copper and silver nanoparticles show a similar extent of antibacterial activity.
关键词： antibacterial,cellulose filter paper,pulsed laser ablation,nanoparticles,contaminated water
更新于2025-09-23 15:19:57
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Superficial preparation of biocompatible carbon quantum dots for antimicrobial applications
摘要： Orange waste peel CQDs has been synthesized via simple hydrothermal method. The UV–visible spectrum shows near band edge absorbance and optical energy bandgap has been calculated as 3.44 eV and 5.60 eV. In addition, the antibacterial assay of CQDs was carried out against two kind of bacteria such as gram positive and gram-negative bacteria. It has been noted that the CQDs show good antibacterial activity towards the gram-negative bacterium Pseudomonas aeruginosa (ZOI: 30 mm). Antibacterial activity of natural waste CQDs was compared with chemically synthesized NPs and QDs.
关键词： Tauc’s plot,CQDs,Hydrothermal method,Electron microscopy,Antibacterial assay
更新于2025-09-23 15:19:57
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Surface Functionalization of Polyethylene by Silicon Nitride Laser Cladding
摘要： Functional coatings are commonly applied to biomaterials in order to improve their properties. In this work, polyethylene was coated with a silicon nitride (Si3N4) powder using a pulsed laser source in a nitrogen gas atmosphere. Several analytical techniques were used to characterize the functionalized surface of the polymer, including Raman spectroscopy, laser microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Antibacterial properties were tested in vitro against Staphylococcus epidermidis. The Si3N4 coating sensibly reduced the amount of living bacteria when compared to the uncoated polymer. Osteoconductivity was also tested in vitro using SaOS-2 osteosarcoma cells. The presence of Si3N4 coating resulted in an increased amount of hydroxyapatite. Coating of polyethylene with silicon nitride may lead to improved performance of indwelling orthopaedic or less invasive medical devices.
关键词： laser cladding,polyethylene,antibacterial,osteointegration,silicon nitride
更新于2025-09-23 15:19:57