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La Nam Phat,Tran Quoc Thang,Huynh Cam Nguyen,Dang Thi My Duyen,Dao Xuan Tien,Bui Dang Dang Khoa,Pham Tan Khang,Nguyen Thi Huong Giang,Hoang Minh Nam,Mai Thanh Phong,Nguyen Huu Hieu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
Recycling biomass to cellulose aerogel (Cell-A) provides a promising approach to develop adsorbent materials for spilled-oil recovery. In this work, Cell-A was fabricated from Vietnamese water hyacinth via crosslinking methods using PVA as a crosslinker and freeze-drying process. Various cellulose to PVA ratios were investigated to obtain the optimal synthesis condition. The Cell-A was additionally modified by dip-coating in poly(dimethylsiloxane) (PDMS) and pyrolyzing to form PDMS-coated cellulose aerogels (Cell-AP) and carbon aerogels (CA), respectively. Results of the oil adsorption tests show that pyrolysis produced aerogels with greater adsorption capacity with an optimal mass ratio of 15 : 1 cellulose to PVA. Furthermore, the pseudo-second-order model was found to be more accurate than the pseudo-first-order model for the study of oil absorption kinetics. As a result, the modified cellulose aerogel is promising for replacing earth-unfriendly polymer-based oil sorbents due to their high oil absorption capacity.
Medicinal Plant Extract and Chitosan Oligomer Antifungal Activities Inhibit Phytophthora capsici
Dang-Minh-Chanh Nguyen,Thi-Hoan Luong,Tien-Chung Nghiem,Van-Viet Nguyen,정우진 한국키틴키토산학회 2023 한국키틴키토산학회지 Vol.28 No.1
This study aims to evaluate antioxidant and antifungal activities from medicinal plant’ methanol extract, chitosan oligomer, and the two combined. Their antioxidative activity was spectroscopically assessed through 2,2-diphenyl-2- picrylhydrazyl (DPPH) and 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging assays. Alternatively, antifungal activity was determined through Phytophthora capsici's mycelial growth inhibition. DPPH and ABTS radical scavenging activities were observed at 1000 ppm concentrations for Glycyrrhiza uralensis extract (GU, 81.4%, IC50=238.4ppm; 83.5%, 199.5ppm, respectively), chitosan oligomer (ChiO, 64.8%, 438.2ppm; 66.6%, 314.5ppm), and GU+ChiO (78.3%, 329.7 ppm; 75.2%, 254.0 ppm). As the standard, ascorbic acid IC50 values were 112.0 and 101.7 ppm, respectively. GU, ChiO, and GU+ChiO at 2.5, 5.0, and 10.0 mg/mL concentrations significantly reduced Phytophthora capsici mycelial growth compared with the control treatment. GU+ChiO EC50 values were 2.04, 2.45, and 2.38 mg/mL at 3, 6, and 9 days after treatment, respectively. These results suggest that the GU and ChiO combination worked as elicitors, triggering enhanced P. capsici suppression in vitro.
Dang-Minh-Chanh Nguyen,Thi-Hoan Luong,Tien-Chung Nghiem,Woo-Jin Jung 한국응용생명화학회 2023 Journal of Applied Biological Chemistry (J. Appl. Vol.66 No.-
The aim of the present study was to evaluate the chemical composition and antioxidative activity of rhizome essential oil of Kaempferia parviflora Wall. ex Baker. The essential oil extracted by hydrodistillation was chemically profiled by GC/MS analysis. The antioxidative activity was determined and evaluated spectroscopically by the 2,2-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) radical scavenging assays. According to the results, the major essential oil components were camphene (18.03%), β- pinene (14.25%), a-pinene (12.38%), endo-borneol (10.23%), β- copaene (8.38%), and linalool (8.20%). K. parviflora rhizome oil possessed antioxidant potential, exhibiting DPPH and ABTS radical scavenging activities as high as 80.90 and 94.04%, respectively, at a concentration of 10 mg/mL. The corresponding IC50 values were 0.451±0.051 and 0.527±0.022mg/mL, respectively (IC50 values for ascorbic acid, as the standard, were 0.209±0.016 and 0.245±0.022 mg/mL, respectively). The mycelium of F. oxysporum was distorted and collapsed when treated with 0.5 mg/ mL of the EO of K. parviflora rhizome for 3 days treatment, which may provide an important information for exploring the metabolism of the fungicide K. parviflora rhizome and its derived compounds against F. oxysporum. This study provides the chemical properties of the essential oil of K. parviflora rhizome grown in Vietnam and their potential antioxidant and antifungal activities.
Interlaminar stresses and delamination of composite laminates under extension and bending
Nguyen, Tien Duong,Nguyen, Dang Hung Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.25 No.6
The metis element method (Hung 1978) has been applied to analyse free edge interlaminar stresses and delamination in composite laminates, which are subjected to extension and bending. The paper recalls Lekhnitskii's solution for generalized plane strain state of composite laminate and Wang's singular solution for determination of stress singularity order and of eigen coefficients $C_m$ for delamination problem. Then the formulae of metis displacement finite element in two-dimensional problem are established. Computation of the stress intensity factors and the energy release rates are presented in details. The energy release rate, G, is computed by Irwin's virtual crack technique using metis elements. Finally, results of interlaminar stresses, the three stress intensity factors and the energy release rates for delamination crack in composite laminates under extension and bending are illustrated and compared with the literature to demonstrate the efficiency of the present method.
Hanh, Dang Dinh,Quang, Nguyen Tien Korean Mathematical Society 2012 대한수학회논문집 Vol.27 No.1
Dual monoidal category $\mathcal{C}^*$ of a monoidal functor F : $\mathcal{C}\;{\rightarrow}\;\mathcal{V}$ has been constructed by S. Majid. In this paper, we extend the construction of dual structures for an Ann-functor F : $\mathcal{B}\;{\rightarrow}\;\mathcal{A}$. In particular, when F = $id_{\mathcal{A}}$, then the dual category $\mathcal{A}^*$ is indeed the center of $\mathcal{A}$ an this is a braided Ann-category.
Tran Dang Thanh,Dinh Chi Linh,Tien Van Manh,Wen-Zhe Nan,Seong-Cho Yu,Hong-Guang Piao,Liqing Pan 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
In this work, we present a detailed study on the magnetic and the magnetocaloric properties of Sm0.5+xSr0.5−xMnO3 compounds with x = 0 − 0.1, which were prepared by using a solid-state reaction method. The x-dependent magnetic, as well as magnetocaloric, properties, including the magnetic phase transition, have been studied. The increase in Sm/Sr ratio plays an important role in controlling the Curie temperature (TC). We point out that all the samples undergo a first-order phase transition and exhibit a giant magnetocaloric effect. The magnetic entropy change (Sm) of samples was calculated based on isothermal M(H, T) data. The maximum value of Sm (denoted as |Smax|) at around TC is found to be 2.6 − 8.9 J·kg−1·K−1 for H = 30 kOe and depends on the value of x. We have also used the universal master curve method for the temperature dependences of Sm curves measured at different H values, Sm(T,H), to distinguish the magnetic order in the samples. Interestingly, none of the Sm(T,H) curves for the samples follow the universal master curve, Sm(T,H)/Smax versus = (T −TC)/(Tr−TC). As a consequence, a breakdown in the universal behavior of Sm(T,H)/Smax versus curve is another feature confirming a first-order phase-transition nature.
Tran Dang Thanh,Dinh Chi Linh,Le Viet Bau,Thi Anh Ho,Tien Van Manh,The-Long Phan,Seong-Cho Yu IEEE 2015 IEEE transactions on magnetics Vol.51 No.1
<P>Four samples of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Mn<SUB>0.92</SUB>Co<SUB>0.08</SUB>O<SUB>3</SUB> (LSMCO) with different crystallite sizes were prepared by the combination of solid-state reaction and mechanical milling methods. Based on isothermal magnetization data, M(H), temperature dependences of magnetic entropy change, ΔS<SUB>m</SUB>T, of the samples under a magnetic field change of 10 kOe were calculated. The maximum values of magnetic entropy change (|ΔS<SUB>max</SUB>|) at room temperature are in the range of 0.9-1.4 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP>, corresponding to ferromagnetic (FM)-paramagnetic phase transition. In addition, M<SUP>2</SUP> versus H/M curves at temperatures around TC prove the samples exhibiting a second-order magnetic phase transition. The critical exponents β, γ, and δ were determined using the modified Arrott plot method and critical isotherm analysis. Here, these exponent values are located in between those expected for the mean-field theory and 3-D Heisenberg model. It means the coexistence of short-range and long-range FM interactions in LSMCO nanoparticles.</P>