Traditional vs. Microfluidic Synthesis of ZnO Nanoparticles

Popa, Maria Leila; Preda, Manuela Daniela; Neacșu, Ionela Andreea; Grumezescu, Valentina; Ginghină, Octav

doi:10.3390/ijms24031875

Cited by 25 publications

(14 citation statements)

References 95 publications

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“…The shape evolution of sol‐gel derived ZnO on porous ceramics is influenced by the surface properties and porosity of the substrate, as well as the growth parameters such as precursor concentration, solvent type, reaction temperature, etc. Depending on these parameters, particles, tubes, rods, needles, plates/sheets, flower‐like, etc., nanostructures can be produced 1,57,65–68 . The ZnO plates obtained in the current study (Figure 7A–C) resembled the plates produced by Jeong et al 69 .…”

Section: Resultssupporting

confidence: 82%

“…Depending on these parameters, particles, tubes, rods, needles, plates/sheets, flower-like, etc., nanostructures can be produced. 1,57,[65][66][67][68] The ZnO plates obtained in the current study (Figure 7A-C) resembled the plates produced by Jeong et al 69 In addition, the elemental mapping, depicted in Figure 7D, showed that the ZnO particles formed with a homogenous distribution throughout the structure. The XRD spectrum of the ZnO-coated CC5 ceramics (Figure 2) exhibited ZnO peaks as well as zinc silicate (Zn 2 SiO 4 ), gahnite (ZnAl 2 O 4 ), and hardystonite (Ca 2 ZnSi 2 O 7 ) peaks which were obtained as a result of the ZnO-ceramic substrate interactions.…”

Section: Zno Coating On the Porous Ceramicssupporting

confidence: 80%

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Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Özcan,

Birol,

Dülger Kutlu

et al. 2023

Int J Applied Ceramic Tech

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In order to improve filtering efficacy, nanoparticles are often deposited as photocatalytic degrading agents onto porous ceramics. This study aimed to deposit ZnO nanoparticles on ceramic substrates produced from fly ash and red mud with adjustable porosity and investigate their photocatalytic properties. To achieve this goal, at first porous ceramics were produced and sintered at various temperature/time intervals. It was observed that sintering at 800°C for 120 min provided a proper structure and porosity. In addition, MgO replacement with MgCO3 lowered the water absorption of the samples from 25.63% to 11.45%. The samples were then coated with ZnO nanoparticles using the sol–gel method and the ZnO structures obtained were micron‐sized plates. It was observed that increasing porosity increased the ZnO amount and accordingly the photocatalytic properties of the products. During the adsorption tests conducted in the dark, the coated ceramic samples were stained with MB with a maximum MB adsorption ratio of ∼14%. On the other hand, no visible MB stain was observed on the samples that were exposed to UV irradiation, and the MB removal after the UV irradiation was 93.6%; therefore, it was concluded that the dominant MB removal mechanism was photocatalytic.

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Section: Resultssupporting

confidence: 82%

Section: Zno Coating On the Porous Ceramicssupporting

confidence: 80%

Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Özcan,

Birol,

Dülger Kutlu

et al. 2023

Int J Applied Ceramic Tech

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“…numerical value can be used to calculate the band-gap value of ZnO [50]. Some literature reports wrongly assign this band to a surface plasmon resonance, which does not exist in semiconductors like ZnO [51].…”

Section: Spectroscopic Studies 331 Uv-vis and Fluorescence (Pl) Spect...mentioning

confidence: 99%

“…Therefore, a relatively large absorption band located in the ultraviolet domain is typical for the UV-Vis spectrum. The electron jump from the valence band to the conduction band generates this absorption peak, and its numerical value can be used to calculate the band-gap value of ZnO [50]. Some literature reports wrongly assign this band to a surface plasmon resonance, which does not exist in semiconductors like ZnO [51].…”

Section: Spectroscopic Studies 331 Uv-vis and Fluorescence (Pl) Spect...mentioning

confidence: 99%

Antibacterial Activity of Zinc Oxide Nanoparticles Loaded with Essential Oils

Motelica,

Vasile,

Ficai

et al. 2023

Pharmaceutics

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One major problem with the overuse of antibiotics is that the microorganisms acquire resistance; thus the dose must be increased unsustainably. To overcome this problem, researchers from around the world are actively investigating new types of antimicrobials. Zinc oxide (ZnO) nanoparticles (NPs) have been proven to exhibit strong antimicrobial effects; moreover, the Food and Drugs Administration (FDA) considers ZnO as GRAS (generally recognized as safe). Many essential oils have antimicrobial activity and their components do not generate resistance over time. One of the drawbacks is the high volatility of some components, which diminishes the antimicrobial action as they are eliminated. The combination of ZnO NPs and essential oils can synergistically produce a stronger antimicrobial effect, and some of the volatile compounds can be retained on the nanoparticles’ surface, ensuring a better-lasting antimicrobial effect. The samples were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), and thermal analysis (TG-DSC) coupled with analysis of evolved gases using FTIR. The ZnO NPs, with a size of ~35 nm, exhibited a loading between 1.44% and 15.62%—the lower values were specific for limonene-containing oils (e.g., orange, grapefruit, bergamot, or limette), while high values were obtained from cinnamon, minzol, thyme, citronella, and lavender oils—highlighting differences among non-polar terpenes and alcohol or aldehyde derivatives. The antibacterial assay indicated the existence of a synergic action among components and a high dependency on the percentage of loaded oil. Loaded nanoparticles offer immense potential for the development of materials with specific applications, such as wound dressings or food packaging. These nanoparticles can be utilized in scenarios where burst delivery is desired or when prolonged antibacterial activity is sought.

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“…This generally leads to the production of NPs with inconsistent or unpredictable sizes. One promising approach to enhance NP synthesis involves microfluidic devices to precisely control the flow and mixing of reactants, leading to highly uniform and monodisperse NPs. − …”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Polymeric Nanoparticle Distribution in a Static versus Dynamic Microfluidic Blood Vessel Model: Implications for Nanoparticle-Based Drug Delivery

Ferreira

Reis

Neves

2023

ACS Appl. Nano Mater.

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Nanoparticles (NPs) have been widely investigated in the nanomedicine field. One of the main challenges is to accurately predict the NP distribution and fate after administration. Microfluidic platforms acquired huge importance as tools to model the in vivo environment. In this study, we leveraged a microfluidic platform to produce FITC-labeled poly(lactide-coglycolide)-block-poly(ethylene glycol) (PLGA-PEG) NPs with defined sizes of 30, 50, and 70 nm. The study aimed to compare the ability of NPs with differences of 20 nm in size to cross an endothelial barrier using static (Transwell inserts) and dynamic (microfluidic perfusion device) in vitro models. Our results evidence a size-dependent NP crossing in both models (30 > 50 > 70 nm) and highlight the bias deriving from the static model, which does not involve shear stresses. The permeation of each NP size was significantly higher in the static system than in the dynamic model at the earliest stages. However, it gradually decreased to levels comparable with those of the dynamic model. Overall, this work highlights clear differences in NP distribution over time in static versus dynamic conditions and distinct size-dependent patterns. These findings reinforce the need for accurate in vitro screening models that allow for more accurate predictions of in vivo performance.

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Traditional vs. Microfluidic Synthesis of ZnO Nanoparticles

Cited by 25 publications

References 95 publications

Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Antibacterial Activity of Zinc Oxide Nanoparticles Loaded with Essential Oils

Size-Dependent Polymeric Nanoparticle Distribution in a Static versus Dynamic Microfluidic Blood Vessel Model: Implications for Nanoparticle-Based Drug Delivery

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