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Thuy Thi Thu Nguyen,Huu The Nguyen,Hai Thi Trinh,Trang Thi Thu Bui,Anh-Tuan Le,Tran Quang Huy 한국고분자학회 2022 Macromolecular Research Vol.30 No.2
In this study, the Pb2+ adsorption capacity of electrospun polyvinylidene fluoride/graphene oxide (PVDF/GO) membranes with different morphological characteristics and compositions were comprehensively compared. Firstly, the chemical characteristics, morphological characteristics and hydrophobicity relating to the adsorption capacity of electrospun PVDF/GO membranes were investigated through Fourier transform infrared spectroscopy, Raman spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy and water contact angle measurement. Adsorption analysis showed that the adsorption performance of electrospun PVDF/ GO increased as GO contents increased. Variations in the average diameter of electrospun PVDF/GO fibres in the range of several micrometres did not cause a distinguishable change in their adsorption capacity. Electrospun PVDF/GO membranes without a porous structure inhibited a low adsorption capacity although they contained a high composition of GO. The modification of electrospun PVDF/GO membranes by adding PEG increased the distribution of GO on the surface of fibres, resulting in a more hydrophilic fibre surface and a notable increase in Pb2+ adsorption. The adsorption behaviour of Pb2+ onto electrospun PVDF/GO/PEG membranes was found to be dependent on contact time and pH. Reusability analysis indicated that the electrospun PVDF/GO/PEG membrane maintained a Pb2+ removal rate of over 80% after six adsorption-desorption cycles. Therefore, electrospun PVDF/GO/PEG membranes might be a promising adsorption material used in filtration systems for heavy metal removal.
Discovery of cycloartane-<i>type</i> triterpene saponins from <i>Mussaenda glabra</i>
Thu, Vu Kim,Bach, Nguyen Xuan,Anh, Luu The,Trang, Do Thi,Nhiem, Nguyen Xuan,Tai, Bui Huu,Van Kiem, Phan,Van Minh, Chau,Park, SeonJu,Seo, Yohan,Namkung, Wan,Kim, Seung Hyun Elsevier 2019 PHYTOCHEMISTRY LETTERS Vol.33 No.-
<P><B>Abstract</B></P> <P>Five new cycloartane saponins, mussaglaosides A–E (<B>1</B>–<B>5</B>) together with five known saponins, mussaendoside O, mussaendoside, G mussaendoside U, mussaendoside P, and mussaendoside Q (<B>6</B>–<B>10</B>) were isolated from the leaves of <I>Mussaenda glabra.</I> Their structures were determined on the basis of extensive spectroscopic methods, including 1D-, 2D-NMR, and MS data. All compounds were evaluated for ANO1 inhibitory activity using calcium-activated chloride channel and YFP expressing HT29 cells. Among the tested compounds, compound <B>6</B> strongly inhibited chloride channel activity with IC<SUB>50</SUB> value of 22.0 ± 1.7 μM without any cytotoxicity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Five new cycloartane saponins, mussaglaosides A–E (<B>1</B>–<B>5</B>) were isolated from <I>Mussaenda glabra</I>. </LI> <LI> The structures were successfully determined by spectroscopic evidence. </LI> <LI> Compound <B>6</B> strongly inhibited chloride channel activity (IC<SUB>50</SUB> value of 22.0 ± 1.7 μM). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
The Impact of COVID-19 Pandemic on Firm Performance: Empirical Evidence from Vietnam
BUI, Trung Huy,NGUYEN, Huong Thu,PHAM, Yen Nhu,NGUYEN, Trang Thu Thi,LE, Linh Thao,LE, Giang Thu Tran Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.7
The outbreak of Coronavirus disease 2019 (COVID-19) has caused serious impacts not only on human health but also on the economies around the world. Enterprises play an important role in the development of every country but it is also one of the most affected sectors during the pandemic. Drawing on panel data of 131 enterprises listed on the Vietnamese stock exchange from 2016Q1 to 2021Q3, this study aims to investigate the impact of the COVID-19 pandemic on firm performance. Enterprises are classified into seven industries including Agriculture, Material, Industry, Real estate and Construction, Energy, Consumer, and Service. The paper also analyzes the variation of the effects among companies, focusing on differences in revenue and capital structure. The results show that the COVID-19 pandemic negatively affects business performance. In addition, the empirical findings indicate that revenue and debt decreasing can cause deterioration of firm performance during the pandemic period. The decrease in revenue has a direct impact on firm profitability. The reduction of debt levels affects the corporate leverage leading to adverse effects on firm performance. The negative effect is more pronounced for companies in some specific sectors including industry, real estate, construction, consumption, and services.
Fintech and Banking: Evidence from Vietnam
LIEN, Nguyen Thi Kim,DOAN, Thu-Trang Thi,BUI, Toan Ngoc Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.9
The paper focuses on understanding fintech and the application of fintech in the banking sector in Vietnam. To solve this research objective, the authors analyze fintech development trends, especially the fintech application in the banking sector in Vietnam. To improve the quality of fintech services at banks, the authors conducted consideration of factors affecting customers' intention to use fintech services. To accomplish this, the authors collected data through a survey of 620 customers of the banks located in Ho Chi Minh City - the largest economic center in Vietnam. For the analytical method, the authors used multivariate regression to estimate the research model. Research results show that fintech service is very important for the banking sector in Vietnam. Moreover, this paper has achieved great success by identifying the factors that influence customers' intention to use fintech services. Accordingly, the intention to use fintech (INT) services is positively affected by the perception of usefulness (PU), social impact (SI), customer trust (TRU), and perceived ease of use (PEU). Based on the results of this study, bank managers will have a basis to improve the quality of fintech services. Not only that, the results of this study are also valuable for policymakers and researchers.
Kim, Da Hun,Trang Bui, Thi Thu,Rasool, Shafket,Song, Chang Eun,Lee, Hang Ken,Lee, Sang Kyu,Lee, Jong-Cheol,So, Won-Wook,Shin, Won Suk American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.2
<P>Energy level alignment between a donor and an acceptor has a critical role in determining the open-circuit voltage (<I>V</I><SUB>OC</SUB>) in polymer solar cells (PSCs). Also, broad absorption of the photoactive layer is required to generate a high photocurrent. Herein, non-fullerene PSCs with D/A random copolymers and 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-<I>d</I>:2′,3′-<I>d</I>′]-<I>s</I>-indaceno[1,2-<I>b</I>:5,6-<I>b</I>′]dithiophene (ITIC) has been demonstrated. The D/A random copolymers are composed of a 2-ethylhexylthienyl-substituted benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene (BDT) donor unit (D) and a fluorinated thieno[3,4-<I>b</I>]thiophene (TT-F) acceptor unit (A). By controlling the D/A unit ratio in the polymer backbone, it is possible to modulate both the energy levels and absorption spectra of random copolymers. As the ratio of the donor unit in the polymer back bone increases, the highest occupied molecular orbital energy level is located deeper, leading to higher <I>V</I><SUB>OC</SUB>. Also, the absorption spectra of random copolymers become blue-shifted with an increase of the donor unit ratio; it compensates the weak absorption region of ITIC. This complementary absorption enhances the photocurrent, leading to higher power conversion efficiency (PCE). Because of the optimization of the D/A ratio of random copolymers, a notable PCE of 10.27% can be achieved in PSCs with D5A and ITIC.</P> [FIG OMISSION]</BR>
A Benzodithiophene-Based Novel Electron Transport Layer for a Highly Efficient Polymer Solar Cell
Kim, Hong Il,Bui, Thi Thu Trang,Kim, Guan-Woo,Kang, Gyeongho,Shin, Won Suk,Park, Taiho American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.18
<P>We designed and synthesized a novel conjugated polyelectrolyte (CPE), poly{3-[2-[4,8-bis(2-ethyl-hexyloxy)-6-methyl-1,5-dithia-<I>s</I>-indacen-2-yl]-9-(3-dimethylamino-propyl)-7-methyl-9H-fluoren-9-yl]-propyl}-dimethyl-amine (PBN). We employed PBN as an electron-transporting layer on a ZnO layer and constructed a highly efficient, inverted structure device consisting of a mixture of poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-<I>b</I>]thiophenediyl}) (PTB7) and PC<SUB>70</SUB>BM, achieving a high power conversion of up to 8.6%, constituting a 21.1% improvement over the control device performance (7.1%) prepared without a PBN layer. This result was ascribed to the reduced interfacial resistance and the improved charge transport and collection through the PBN electron transport layer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-18/am503419r/production/images/medium/am-2014-03419r_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am503419r'>ACS Electronic Supporting Info</A></P>