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Cuong-Le, Thanh,Nguyen, Khuong D.,Le-Minh, Hoang,Phan-Vu, Phuong,Nguyen-Trong, Phuoc,Tounsi, Abdelouahed Techno-Press 2022 Advances in nano research Vol.12 No.5
This study explores the linear and nonlinear solutions of sigmoid functionally graded material (S-FGM) nanoplate with porous effects. A size-dependent numerical solution is established using the strain gradient theory and isogeometric finite element formulation. The nonlinear nonlocal strain gradient is developed based on the Reissner-Mindlin plate theory and the Von-Karman strain assumption. The sigmoid function is utilized to modify the classical functionally graded material to ensure the constituent volume distribution. Two different patterns of porosity distribution are investigated, viz. pattern A and pattern B, in which the porosities are symmetric and asymmetric varied across the plate's thickness, respectively. The nonlinear finite element governing equations are established for bending analysis of S-FGM nanoplates, and the Newton-Raphson iteration technique is derived from the nonlinear responses. The isogeometric finite element method is the most suitable numerical method because it can satisfy a higher-order derivative requirement of the nonlocal strain gradient theory. Several numerical results are presented to investigate the influences of porosity distributions, power indexes, aspect ratios, nonlocal and strain gradient parameters on the porous S-FGM nanoplate's linear and nonlinear bending responses.
Le, Cuong M. Q.,Cao, Xuan Thang,Kim, Dong Woo,Ban, Uk Hyeon,Lee, Sang Ho,Lim, Kwon Taek Informa UK (TaylorFrancis) 2017 Molecular Crystals and Liquid Crystals Vol.654 No.1
<P>A pH-responsive drug release system based on doxorubicin conjugated poly(styrene-alt-maleic anhydride) grafted multi-walled carbon nanotubes (MWNT/PSMA-DOX) was prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and acid-cleavable hydrazone linkages. Firstly, multi-walled carbon nanotubes (MWNTs) were modified with a furfuryl derivative RAFT agent by Diels-Alder reaction. The polymerization of styrene and maleic anhydride was carried out in the presence of functionalized MWNTs to afford MWNT/PSMA. The maleic anhydride ring located along the polymer chains was opened by hydrazine subsequently conjugated with doxorubicin via an acid-sensitive hydrazone bond. The composite materials were characterized by FT-IR, H-1-NMR, TGA and TEM analysis. In vitro experiments showed a burst release of doxorubicin at pH 5.0 whereas slight release at pH 7.4.</P>
Le, Cuong M.Q.,Cao, Xuan Thang,Lim, Kwon Taek Elsevier 2017 Ultrasonics sonochemistry Vol.39 No.-
<P><B>Abstract</B></P> <P>A facile and environmentally friendly strategy for grafting polymers onto the surface of multi-walled carbon nanotubes (CNTs) was demonstrated by Diels-Alder “click chemistry”. Firstly, the copolymers of poly(styrene-<I>alt</I>-maleic anhydride) (PSM) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently functionalized with furfuryl amine to introduce anchoring groups. The copolymers were then grafted on CNTs via the Diels-Alder reaction in water through a conventional heating-stirring route and ultrasound-assisted method. The obtained nanocomposite materials were characterized by thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and transmission electron microscopy. The results indicated that the reaction rate under ultrasound irradiation was accelerated about 12 times than the one under the conventional heating-stirring condition without losing the grafting efficiency. The direct functionalization of CNTs formed a stably dispersed solution in water, promising a green and effective method for industrial process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The reaction rate was significantly accelerated by ultrasound irradiation. </LI> <LI> Direct functionalization of carbon nanotubes in water without catalyst. </LI> <LI> The process is simple and is not involving any hazardous chemicals. </LI> </UL> </P>
Le, Cuong M.Q.,Cao, Xuan Thang,Jeong, Yeon Tae,Lim, Kwon Taek Elsevier 2018 Journal of industrial and engineering chemistry Vol.64 No.-
<P><B>Abstract</B></P> <P>Imidazolium-based poly(ionic liquid)s grafted on the surface of multiwalled carbon nanotubes (MWNTs) were prepared by Diels–Alder “click” reaction with a high grafting density. Poly(styrene-<I>alt</I>-maleic anhydride) (PSM) was functionalized with furfuryl amine and then it was modified with 1-(3-aminopropyl)-3-methylimidazolium bromide to produce poly(ionic liquid)s functionalized with furfuryl groups (PSMF-ILs). PSMF-ILs were directly grafted onto the surface of MWNTs under ultrasonication to form PSMF-IL/MWNT nanocomposites. The material was characterized by FTIR, Raman spectroscopy, XRD, XPS and TEM analyses. The results showed that a very high grafting density was achieved in deep eutectic solvents based on choline chloride:ethylene glycol in a short time.</P>
Le Cuong Nhat,Kim Hyun Woo,Baek In Hyung,Bark Hyeon Sang,Shin Junho,Jang Kyu-Ha,Cho Sunglae,Jeong Young Uk,Oang Key Young,Lee Kitae 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.5
In this paper, we report the structural dynamics of polycrystalline bismuth (Bi) thin flms in response to photoexcitation, visualized by mega-electron-volt ultrafast electron difraction. The data reveal that the carrier–phonon scattering process involves phonon squeezing within sub-picoseconds (ps) and lattice thermalization within a few ps. Through the time-resolved pair distribution function analysis, we directly observe the changes in the interatomic distance of adjacent Bi atoms in real space, which can be explained by phonon softening and subsequent phonon squeezing.
Cuong M.Q. Le,Xuan Thang Cao,정연태,임권택 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Imidazolium-based poly(ionic liquid)s grafted on the surface of multiwalled carbon nanotubes (MWNTs) were prepared by Diels–Alder “click” reaction with a high grafting density. Poly(styrene-alt-maleic anhydride) (PSM) was functionalized with furfuryl amine and then it was modified with 1-(3-aminopropyl)-3-methylimidazolium bromide to produce poly(ionic liquid)s functionalized with furfuryl groups (PSMF-ILs). PSMF-ILs were directly grafted onto the surface of MWNTs under ultrasonication to form PSMF-IL/MWNT nanocomposites. The material was characterized by FTIR, Raman spectroscopy, XRD, XPS and TEM analyses. The results showed that a very high grafting density was achieved in deep eutectic solvents based on choline chloride:ethylene glycol in a short time.
Le, Cuong M.Q.,Cao, Xuan Thang,Tu, Trang T.K.,Lee, Won-Ki,Lim, Kwon Taek Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.450 No.-
<P><B>Abstract</B></P> <P>Deep eutectic solvents (DESs), a new type of cost-effective ionic liquid analogues, were employed to develop a novel and efficient method for direct functionalization of multiwalled carbon nanotubes (MWNTs) via Diels-Alder (DA) click reaction. Poly(ionic liquid)s featuring furfuryl moieties (P(F-ILs)) and butyl moieties (P(B-ILs)) were synthesized by the functionalization of poly(chloromethylstyrene-alt-maleic anhydride) with 1-methylimidazole and furfuryl amine or butylamine. Then, the polymer was directly grafted on the surface of untreated MWNTs in choline:ethylene glycol (ChCl:EG) based DES without any catalyst. The successful functionalization of the polymer on MWNTs was confirmed by Raman spectroscopy, TGA, and XPS analysis. It was shown that the reaction proceeded in a very rapid fashion (less than an hour) and the use of DESs significantly improved the grafting density (more than double) as compared with the reaction in water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Deep eutectic solvents was utilized as a green and efficient reaction media. </LI> <LI> Fast and facile method for grafting poly(ionic liquid)s onto carbon nanotubes. </LI> <LI> High grafting density was obtained under catalyst-free and mild reaction condition. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Le Ngoc Cuong,Jong-Taek Oh 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.1
In this paper, the heat pump system has been developed by CFD simulation and experimental investigation. It studies the thermal behavior of a thermobank and COP on heat pump system and cold storage. The thermobank stores the waste heat of during refrigeration cycles and this energy is used for defrosting process and heating room. It also reduces defrosting time and condensation load so that the temperature regulation in the cold storage is constant. The system is investigated experimentally and CFD simulated under thermobank. The dimension L W H of cold storage is 3 1:6 1:4m, thermobank is 600 300 400 mm. The temperature of ambient on CFD simulation process is 20C. This heat pump system can be used to keep preservation of agricultural products in cold storage warehouse together with °oor panel heating for room in winter. The ejector is used in system with the aim of increasing coe±cient of performance (COP) and decrease in compressor displacement. As the experimental results, its COP is increased about 38.57% when using thermobank and ejector in heat pump system.