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Research Article
CiteSpace Visualisation and Analysis of Research Trends and Hotspots in Degradable Plastics
Yumeng Liu
,
Zihang Xu,
Zhihan Wang,
Yalin Liu,
Yueting Ning,
Zihao Sun,
Yuan Zhao,
Songtao Wang,
Bolin Zhao,
Jiazhou Chen,
Huihui Wang,
Sai Geng*
Issue:
Volume 10, Issue 3, September 2024
Pages:
47-56
Received:
7 May 2024
Accepted:
3 June 2024
Published:
31 July 2024
Abstract: Degradable plastics refer to adding some additives to promote their degradation or using renewable natural substances as raw materials; their light quality, good comprehensive performance, easy processing, and many other advantages have been favoured by society. Through the research method of bibliolatry, retrieval in 2013-2023 Web of Science database about biodegradable plastics research related literature information, using CiteSpace measurement analysis software visual analysis in the relevant literature keywords, publications, high cited frequency, cooperation and common word clustering information change trend, analyze the research situation in the field of biodegradable plastics in recent years, summarizes the biodegradable plastic research status, progress and research hotspot. The results of the analysis show that degradable plastic materials are an emerging research field, and the number of publications has increased rapidly since 2020. The 2019-2022 accounted for about 81% of the total in the research period. Most related studies are published in ACS NANO, ADVANCED FUNCTIONAL MATERIALS, NANOSCALE, and other journals, and they have high academic research value. The hot research field of degradable plastics focuses on polylactic acid materials and their mechanical properties. Various research hotspots are very closely related, with strong correlation and complementarity.
Abstract: Degradable plastics refer to adding some additives to promote their degradation or using renewable natural substances as raw materials; their light quality, good comprehensive performance, easy processing, and many other advantages have been favoured by society. Through the research method of bibliolatry, retrieval in 2013-2023 Web of Science datab...
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Research Article
A Semiflexible Polymer Translocation Through a Cylindrical Channel
Issue:
Volume 10, Issue 3, September 2024
Pages:
57-66
Received:
26 June 2024
Accepted:
18 July 2024
Published:
15 August 2024
Abstract: In this study, translocation of a semi flexible polymer through a cylindrical channel have been investigated. A two-dimensional Monte Carlo simulation was employed, by utilizing the bond fluctuation method (BFM) to investigate the translocation processes of a chain length N. To surmount the entropic barrier, the middle monomers of the polymer have been positioned at the center of the pore, which is situated between the CIS and TRANS regions. Consequently, the static properties of a semi-flexible polymer by calculating the mean square end-to-end distance ‹R2› and the mean square radius of gyration ‹Rg2› as functions of the chain length (N) have been examined. The mean square end-to-end distance and the mean square radius of gyration are proportional to the number of monomers N as ‹R2› ~ N1.496 and ‹R2g› ~ N1.505 correspondingly for a short cylindrical channel length L = 2, which aligns with the theoretically predicted. These finding indicates that the relationships between ‹R2› and ‹Rg2› and the polymer chain size N are strongly influenced by the channel length L. The dynamic properties by analyzing the translocation time of the polymers also studied. Additionally, the relationship between the escape time τ and the polymer chain length N depends on the pore width W, which is equivalent to the diameter of the cylindrical channel. These research demonstrates that the escape time τ decreases as the width increases and escape time τ increases as the chain stiffness increases.
Abstract: In this study, translocation of a semi flexible polymer through a cylindrical channel have been investigated. A two-dimensional Monte Carlo simulation was employed, by utilizing the bond fluctuation method (BFM) to investigate the translocation processes of a chain length N. To surmount the entropic barrier, the middle monomers of the polymer have ...
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Research Article
Study of the Use of Oxygenated Water as a Non-Toxic Molecule Model for Catalytic Testing of Pozzolana-PN and Iron-Based NOx Reducing Catalysts
Rabeharitsara Andry Tahina*,
Ny Itokiana Tsihoarana Mandimbimiarana,
Raobijaona Baholy,
Hdr Ratsimba Marie Hanitriniaina,
Randriana Nambinina Richard Fortuné,
Rakotomamonjy Pierre
Issue:
Volume 10, Issue 3, September 2024
Pages:
67-82
Received:
24 August 2024
Accepted:
11 September 2024
Published:
29 September 2024
Abstract: During previous catalytic tests on the reducing power of NOx catalysts based on pozzolana and PN-black citric acid polymer, it was found that the use of the NO2 model molecule poses a significant health and environmental risk. Thus, a project was launched to find another, much less harmful model molecule. Hydrogen peroxide H2O2 was chosen, a molecule naturally secreted by the body to prevent pigment synthesis, with disinfectant, antiseptic and whitening properties widely used in various activities, including cosmetics. Consequently, catalytic tests of NOx-reducing power using hydrogen peroxide H2O2 as a model molecule were carried out on two catalysts based on pozzolana and PN-black polymer of citric acid, PNP-Fe-water-15% and PNP-Fe-ethanol-15%, differing in the solvent used during their syntheses according to a procedure detailed in the bibliography and this manuscript. Pozzolana is a volcanic rock widespread in the volcanic mountains in the Vakinankaratra region of Madagascar. Its use as a support for catalysts based on PN-black polymer of citric acid and Iron-Fe enabled us to synthesize various catalysts, the characteristics and synthesis methods of which are detailed in this manuscript. In short, the catalytic test with hydrogen peroxide was conclusive, enabling a pragmatic comparison of the two catalysts tested, with the result that the catalyst synthesized with water PNP-Fe-water-15% is more active than the catalyst synthesized with ethanol PNP-Fe-ethanol-15%. This is due to the quality and difference in dispersion of the PN-black polymer molecules depending on the solvent used, which can have an impact on the nature of the catalyst surfaces and certain characteristics such as porosity. This dispersion is confirmed and viewed using an optical microscope to visualize the surface of a catalyst grain. Kinetic results from two proposed mechanisms for the reduction of H2O2 hydrogen peroxide molecules using PNP-Fe catalysts also confirmed not only the proposed mechanisms, but also the higher activity of PNP-Fe catalysts synthesized with water, whose kinetic constants are much higher than those synthesized with ethanol.
Abstract: During previous catalytic tests on the reducing power of NOx catalysts based on pozzolana and PN-black citric acid polymer, it was found that the use of the NO2 model molecule poses a significant health and environmental risk. Thus, a project was launched to find another, much less harmful model molecule. Hydrogen peroxide H2O2 was chosen, a molecu...
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