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  • 1
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-8-17), p. 1-6
    Abstract: A green deposition method of zinc oxide nanoparticles using coffee leaf extraction was successfully prepared. The use of these preparation techniques is accepted by many researchers because it is nonexpensive and simple and has no environmental impact during the operation. The determination and reduction of Zn ions to ZnO NPs were characterized by using a UV-visible spectroscope. The UV-visible spectroscopy result reveals that the large band gap energy is observed in the visible region at the wavelength of 300 nm. X-ray diffraction and SEM analysis confirm that the deposited nanoparticle is highly crystalline with (111), (222), and (100) planes and cubic shape structure. The coffee leaf extraction serves as a reducing agent for stability of the particle length, where its medicinal value outcome showed an important antibacteria of the pathogenic type which appeared on the wound. The present research deals with the green synthesis of ZnO NPs as well as its application in toxicity reduction.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 2
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-8-26), p. 1-9
    Abstract: The production of zinc oxide nanoparticles (ZnO NPs) utilizing different vegetable extracts (onion, cabbage, carrot, and tomato) was performed in this research owing to its excellency over other methods of synthesis, namely, simplicity, environmental friendliness, and the elimination of harmful compounds. Fresh extracted onion, cabbage, carrot, and tomato of ZnO NPs are characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible spectroscopy. FTIR findings demonstrate that the prepared nanoparticles were observed in the spectrum of 626 cm-1–1219 cm-1 with some other functional groups. Wurtzite hexagonal structure of the prepared ZnO NPs was observed from XRD results. In addition, the prepared nanoparticles were failed into nanoscales (17 nm, 18 nm, 24 nm, and 15 nm) calculated from Scherrer’s equation. Nearly spherical shapes were seen from SEM image for onion and tomato extraction while rod and tube for carrot and cabbage, respectively. Two broad peaks were observed from UV-vis spectroscopy results for each extract. The presence of a wide range of energy bandgaps in the region of 3-4 eV was detected, indicating that ZnO NP material can be employed in metal oxide semiconductor-based systems. The dye-sensitive solar cell based on ZnO NPs has been successfully synthesized, and the efficiency of the device has been evaluated by measuring the current density-voltage behaviour under the presence of artificial sunshine. The increased effectiveness of the manufactured dye-sensitive solar cell is attributable to a large improvement in dye molecular adsorption onto the surface of ZnO NPs. Thus, the usage of the green produced ZnO NPs with creating dye sensitivity solar cell is a simple and viable way for the well-being of our future.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 3
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-9-17), p. 1-10
    Abstract: Comparison of green and chemical precipitation method syntheses of zinc oxide nanoparticles (ZnO NPs) was performed, and antimicrobial properties were investigated. Avocado, mango, and papaya fruit extracts were carried out for the green synthesising methods, while the chemical precipitation method was chosen from chemical synthesis methods. Zinc nitrate was used as a salt precursor, whereas leaf extract was served as a reducing agent for green synthesising methods. In addition, sodium hydroxide, polyvinyl alcohol, and potassium hydroxide were used as reducing agents in the case of chemical precipitation synthesis methods. ZnO NPs were characterised by characterizing techniques such as Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The antimicrobial activities of prepared nanoparticles were evaluated on Bacillus subtilis (B. subtilis), Staphylococcus aureus (S. aureus), and Salmonella typhimurium (S. typhimurium). The particle sizes of the prepared samples which were evaluated by the Scherrer equation were in the range of 11-21 nm for green synthesis, while 30-40 nm for chemical precipitation synthesis methods. Small agglomerations were observed from SEM results of prepared ZnO NPs from both methods. Prepared ZnO NPs were showed strong antimicrobial properties. From the result, the inhibition zone was in the range of 15-24 mm for the green route and 7–15 mm for chemical precipitation methods, where the standard drugs have 25 mm of the zone of inhibition. A green synthesised method of preparing ZnO NPs gives promising antimicrobial properties compared to chemical synthesis and is also eco-friendly and safe compared to the chemical synthesis.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 4
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2021 ( 2021-9-22), p. 1-10
    Abstract: Ultraviolet radiation causes damages to the human body, such as skin ageing, skin cancer, and allergies throughout the world. Applying zinc oxide nanoparticles (ZnO NPs) in sunscreen products (like cloths or textiles) to protect human skin by absorbing the ultraviolet radiations that emerged from the sun. The main aim of this study is to investigate both absorbance and transmittance characteristics of the untreated and treated cotton textiles. For ZnO NPs using hydrothermal methods, they were made from Zn(NO3)2·6H2O and NaOH at a constant annealing temperature of 300°C. Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis spectroscopy were used to analyze the produced ZnO NPs. From the FT-IR result, ZnO NPs were observed in the region of 400-600 cm-1. Wurtzite hexagonal structure of ZnO NPs with the average crystal size 32 ± 49  nm was observed from XRD results. Flowers in the shape of synthesized ZnO NPs were observed from SEM images. The UV-vis penetration peaks were identified at 264 nm and 376 nm, with energy band gaps of 4.68 and 3.536 eV, respectively. When compared to bulk ZnO, the energy band gap of ZnO NPs was blue-shifted due to the impact of quantum confinement. The peaks in UV-vis absorption were caused by an electronic transition from the valiancy to the conduction bands. The high energy band shows high absorbance of the synthesis sample in the case of 264 nm. The ZnO NPs were manufactured and applied to 100% of raw cotton to impart sunscreen action to both untreated and treated cotton fabrics. The performance of treatment has been evaluated utilizing UV-vis spectroscopy through quantifying ultraviolet protective factors (UPF) and percentage of transmitted (%T) radiations. The treated cotton textiles have 61.50% UPF while 2.65% ultraviolet radiations were transmitted. In other words, untreated cotton textiles have 1.63% UPF while 74.56% ultraviolet radiation was transmitted. Therefore, the treated cotton textiles have excellent protection categories when compared to untreated cotton textiles.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2229480-6
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  • 5
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2022 ( 2022-4-4), p. 1-9
    Abstract: Historically, silver has been recognized as a powerful antibacterial agent with a broad spectrum of functions, and it has been employed safely in healthcare for several years. It seems that the incorporation of silver into embedded medical devices may be advantageous when particular genetic features, including such antibacterial behavior, are needed for the device to function. According to current and prior bacterial studies, it appears that the toxicity against bacteria was significantly more significant than the toxicity against human cells. Silver nanoparticles are nanoparticles with sizes ranging between one and one hundred nanometers (nm) in size. When it comes to molecular diagnostics, therapies, and equipment that are employed in a wide range of medical procedures, silver nanoparticles have a number of unique qualities that make them very useful. The physical and chemical approaches are the two majority ways for the creation of silver nanoparticles. The challenge with chemical and physical approaches is that the synthesis is complicated and can result in harmful compounds being absorbed onto the surfaces of the materials. In order to address this, the biological technique offers a viable alternative solution. Bacteria, fungus, and plant extracts are the three principal biological systems concerned in this process. A complete overview of the mechanism of action, manufacture, and uses in the medical area, as well as the healthcare and ecological concerns that are believed to be produced by these nanoparticles, is provided in this paper. The emphasis is on the proper and effective synthesis of silver nanoparticles even while exploring their numerous promising utility and attempting to assess the current status in the debates over the toxicity concerns that these nanoparticles pose, as well as attempting to reflect the needs in the debates over the toxicity concerns that these nanoparticles pose.
    Type of Medium: Online Resource
    ISSN: 1687-4129 , 1687-4110
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2229480-6
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  • 6
    In: Advances in Materials Science and Engineering, Hindawi Limited, Vol. 2021 ( 2021-07-05), p. 1-7
    Abstract: The thermal behavior of the biodegradable Calotropis procera (CP) particle-reinforced polylactic acid (PLA) biocomposites was investigated. The injection molding process was used to make the composites, and the CP particle weight percentage was varied during the process (0%, 5%, 10%, 15%, and 20%). The melt flow index, heat deflection temperature, Vicat softening point, and the thermal properties of the composites were determined using dynamic mechanical testing. The results were analyzed and compared to the thermal properties of the neat PLA. The results revealed the increase in thermal stability of the PLA due to the addition of CP particles. The CP particles aided in the restriction of polymer mobility, which elevated the glass transition temperature of the composite. Incorporating CP particles in the PLA can increase the PLA/CP composite utilization in heat dissipation applications.
    Type of Medium: Online Resource
    ISSN: 1687-8442 , 1687-8434
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2501025-6
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  • 7
    Online Resource
    Online Resource
    Hindawi Limited ; 2002
    In:  International Journal of Mathematics and Mathematical Sciences Vol. 32, No. 5 ( 2002), p. 319-324
    In: International Journal of Mathematics and Mathematical Sciences, Hindawi Limited, Vol. 32, No. 5 ( 2002), p. 319-324
    Abstract: An analytic function f ( z ) = z + a   n + 1   z   n + 1 + ⋯ , defined on the unit disk △ = { z : | z | 〈 1 } , is in the class S   p if z   f ′ ( z ) / f ( z ) is in the parabolic region Re w 〉 | w − 1 | . This class is closely related to the class of uniformly convex functions. Sufficient conditions for function to be in S   p are obtained. In particular, we find condition on λ such that the function f ( z ) , satisfying ( 1 − α ) ( f ( z ) / z )   μ + α f ′ ( z ) ( f ( z ) / z )   μ − 1 ≺ 1 + λ z , is in S   p .
    Type of Medium: Online Resource
    ISSN: 0161-1712 , 1687-0425
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2002
    detail.hit.zdb_id: 1492203-4
    SSG: 17,1
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  • 8
    Online Resource
    Online Resource
    Hindawi Limited ; 2009
    In:  International Journal of Mathematics and Mathematical Sciences Vol. 2009 ( 2009), p. 1-13
    In: International Journal of Mathematics and Mathematical Sciences, Hindawi Limited, Vol. 2009 ( 2009), p. 1-13
    Abstract: We apply the general theory of differential subordination to obtain certian interesting criteria for -valent starlikeness and strong starlikeness. Some applications of these results are also discussed.
    Type of Medium: Online Resource
    ISSN: 0161-1712 , 1687-0425
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2009
    detail.hit.zdb_id: 1492203-4
    SSG: 17,1
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  • 9
    Online Resource
    Online Resource
    Hindawi Limited ; 1989
    In:  International Journal of Mathematics and Mathematical Sciences Vol. 12, No. 2 ( 1989), p. 333-340
    In: International Journal of Mathematics and Mathematical Sciences, Hindawi Limited, Vol. 12, No. 2 ( 1989), p. 333-340
    Type of Medium: Online Resource
    ISSN: 0161-1712 , 1687-0425
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 1989
    detail.hit.zdb_id: 1492203-4
    SSG: 17,1
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  • 10
    Online Resource
    Online Resource
    Hindawi Limited ; 2006
    In:  International Journal of Mathematics and Mathematical Sciences Vol. 2006 ( 2006), p. 1-13
    In: International Journal of Mathematics and Mathematical Sciences, Hindawi Limited, Vol. 2006 ( 2006), p. 1-13
    Abstract: The purpose of this present paper is to derive some subordination and superordination results for certain normalized analytic functions in the open unit disk. Relevant connections of the results, which are presented in the paper, with various known results are also considered.
    Type of Medium: Online Resource
    ISSN: 0161-1712 , 1687-0425
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2006
    detail.hit.zdb_id: 1492203-4
    SSG: 17,1
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