Dielectric barrier plasma effect on surface functionality and coating properties of ultrasonically coated cotton with ZnO nanoparticles and Aloe vera extraction

2021 ◽  
Author(s):  
I. U. Haq ◽  
M. Y. Naz ◽  
S. Shukrullah ◽  
M. Anwar ◽  
S. Ullah ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Aloe Vera ◽  
Coating Properties ◽  
Dielectric Barrier ◽  
Surface Functionality ◽  
Coated Cotton ◽  
Plasma Effect

Non-wettable antibacterial thin film: PS/Aloe vera and PS/Acalypha indica

2021 ◽  
pp. 096739112110178
Author(s):  
O Seifunnisha ◽  
R Swathi ◽  
J Shanthi
Keyword(s):  
Antibacterial Activity ◽  
Biomedical Applications ◽  
Aloe Vera ◽  
Antibacterial Properties ◽  
Dip Coating ◽  
Angle Measurement ◽  
Diffusion Method ◽  
Wetting Property ◽  
Coated Cotton ◽  
Acalypha Indica

The water and liquid repelling materials due to their low surface energy and specific nanometer and micrometer scale roughness have particular interest due to the great variety of potential applications ranging from self-cleaning surfaces to microfluidic devices. Natural plant-based polymer hydrophobic coatings have several engineering and biomedical applications. In this study, natural plants such as Aloe vera and Acalypha indica were used for preparation of polystyrene hydrophobic film by the dip-coating method. The effects of Aloe vera and Acalypha indica extract on the morphological, structural, optical and antibacterial properties of as-prepared polystyrene thin films were studied. FTIR spectra were carried out to ascertain the presence of functional groups in the prepared polymeric film. Contact angle measurement showed that the PS/ Aloe vera has higher anti-wetting property (CA = 112°) compared to PS/ Acalypha indica (CA = 104°), which could be confirmed by the surface morphology analysis. Furthermore, the effective antibacterial activity against Klebsiella pneumoniae and Staphylococcus aureus was compared by agar-well diffusion method. The observed result reports, PS with Aloe vera film exhibit higher hydrophobic with antibacterial activity compared to PS with Acalypha indica film. In addition, the PS/ Aloe vera coated cotton maintained their repellent properties against various liquids for 10 h, while PS/ Acalypha indica coated cotton exhibit anti-wetting property for 4 h. These findings open up new avenues for the preparation of hydrophobic film for various biomedical applications.

Dielectric barrier discharge and radio-frequency plasma effect on structural properties of starches with different amylose content

2021 ◽  
Vol 68 ◽  
pp. 102630
Author(s):  
Israel Sifuentes-Nieves ◽  
Guadalupe Mendez-Montealvo ◽  
Pamela C. Flores-Silva ◽  
Martin Nieto-Pérez ◽  
Guadalupe Neira-Velazquez ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Structural Properties ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Amylose Content ◽  
Radio Frequency Plasma ◽  
Dielectric Barrier ◽  
Frequency Plasma ◽  
Plasma Effect

Dielectric-Barrier Discharge Plasma Effect on the Physico-Chemical Properties of the Seed Coat and Seed Germination of Umbu (Spondias tuberosa Arr Camara)

2016 ◽  
Vol 6 (3-4) ◽  
pp. 361-373 ◽  
Author(s):  
Clodomiro Alves Junior ◽  
Mikelly Lima de Farias ◽  
Jussier de Oliveira Vitoriano ◽  
Regina Celia de Sousa ◽  
Marcicleide Lima do Espirito Santo ◽  
...  
Keyword(s):  
Seed Germination ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Chemical Properties ◽  
Dielectric Barrier Discharge Plasma ◽  
Dielectric Barrier ◽  
Physico Chemical ◽  
Barrier Discharge Plasma ◽  
Spondias Tuberosa ◽  
Plasma Effect

scholarly journals Chitosan-Based Antimicrobial Coating for Improving Postharvest Shelf Life of Pineapple

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1366
Author(s):  
Indra Bhusan Basumatary ◽  
Avik Mukherjee ◽  
Vimal Katiyar ◽  
Santosh Kumar ◽  
Joydeep Dutta
Keyword(s):  
Weight Loss ◽  
Shelf Life ◽  
Zno Nanoparticles ◽  
Aloe Vera ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Visual Appearance ◽  
Postharvest Losses ◽  
Decay Index ◽  
Coating Formulation

Rapid postharvest losses and quality deteriorations in pineapple are major challenges to growers and handlers. Chitosan-based coatings on fruit surfaces have gained importance in recent years to enhance postharvest shelf life of the fruits. In this study, aloe vera gel was added as a natural antioxidant in chitosan-based composite coating containing ZnO nanoparticles. The developed formulation was applied on the surface of freshly harvested pineapple fruits. ZnO nanoparticles were used as an antimicrobial agent. Coated pineapple fruits were evaluated for weight loss, total soluble solids, titratable acidity, decay index, maturity index, and sensory attributes, including visual appearance, periodically at 5 day interval during storage. The results showed that the coating of the fruit reduced weight loss by about 5%, and also delayed ripening and oxidative decay compared to the uncoated fruit. Thus, the developed coating formulation is a promising sustainable solution to reduce postharvest losses and to extend shelf life of pineapples.

Simple Combustion Synthesis, Structural, Morphological, Optical and Catalytic Properties of ZnO Nanoparticles

2019 ◽  
Vol 19 (6) ◽  
pp. 3564-3570 ◽  
Author(s):  
S. Rosy Christy ◽  
L. Srimathi Priya ◽  
M Durka ◽  
A Dinesh ◽  
N Babitha ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Low Cost ◽  
Synthesis Method ◽  
Aloe Vera ◽  
Band Gap Energy ◽  
High Yield ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Zno Nanostructures ◽  
X Ray

In this present study, semiconductor zinc oxide (ZnO) nanoparticles were successfully prepared by microwave irradiation (ZnO-MIM) and conventional combustion (ZnO-CCM) method, respectively using Aloe vera plant extract as reducing agent. Crystal structure, purity and surface morphology of the samples were examined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. UV-Visible diffuse reflectance (DRS) and photoluminescence (PL) spectral studies was used to analysis the optical property and band gap energy of the samples. The antibacterial activities of ZnO nanostructures (ZnO-MIM and ZnO-CCM) were tested against both gram positive (Bacillus subtilis, Staphylococcus aureus) and gram negative bacteria (Proteus mirabilis, Salmonella typhi) by modified disc diffusion method and observed enhanced activity against P. mirabilis and S. typhi. ZnO nanostructures (ZnO-MIM and ZnO-CCM) were used as the photo-catalysts for the degradation of methylene blue (MB) dye and observed enhanced efficiency of degradation of MB than that of their same bulk materials. Moreover, the synthesis method is easy with low cost and time consumable and also high yield purity products.

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