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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,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 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, 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>
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.
Dynamics of magnetic droplet soliton: freezing and thawing; coexisting and interacting
S. Chung,M. Ahlberg,S. Jiang,A. Frisk,M. Khademi,R. Khymyn,A. A. Awad,Q. Tuan Le,H. Mazraati,A. Houshang,M. Mohseni,M. Weigand,I. Bykova,F. Groß,E. Goering,G. Schutz,J. Grafe,O. Heinonen,J. Akerman 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1
Q. H. Le(레광환),Y. M. Jeong(정영만),C. T. Nguyen(웬치탄),S. Y. Yang(양순용) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.2
Excavators are versatile earthmoving equipment that are used in civil engineering, hydraulic engineering, grading and landscaping, pipeline construction and mining. Effective operator training is essential to ensure safe and efficient operating of the machine. The virtual reality excavator based on simulation using conventional large size monitors is limited by the inability to provide a realistic real world training experience. We proposed a flexible observation method with a head tracking system to improve user feeling and sensation when operating a virtual reality excavator. First, an excavation simulator is designed by combining an excavator SimMechanics model and the virtual world. Second, a head mounted display (HMD) device is presented to replace the cumbersome large screens. Moreover, an Inertial Measurement Unit (IMU) sensor is mounted to the HMD for tracking the movement of the operator"s head. These signals consequently change the virtual viewpoint of the virtual reality excavator. Simulation results were used to analyze the performance of the proposed system.
Study on Intuitive Configuration of Joystick for Operator in Flattening Task of Excavator
Q. H. Le(레광환),Y. M. Jeong(정영만),C. T. Nguyen(웬치탄),S. Y. Yang(양순용) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
Hydraulic excavators are among the most versatile earthmoving equipment: these machines are used in civil engineering, hydraulic engineering, grading and landscaping, pipeline construction and mining. Especially, to flattening the ground these, the excavator operator actuates the machine controls (joysticks, pedals and switches) in an organized form to achieve the desired straight motion; the actuation of these controls is a complex and not intuitive task, and therefore it requires long and costly training periods. This paper present a intuitive configuration of joystick for operator in flattening task of excavator. This method control lets each joystick perform independent horizontal and vertical motions of the end of bucket. The proposed method allows an user to control the excavator intuitively and operate complex motions smoothly with no constraints. For this, a virtual excavator scheme with a joystick control has been developed. Besides, the virtual reality interface is designed to allow the use be able to observe the motion of the attachment of this model.
Le, A.T.,Hoa, N.Q.,Tam, P.D.,Park, D.G.,Phan, M.H.,Srikanth, H.,Yu, S.C. Elsevier 2010 Materials science and engineering B. Advanced Func Vol.166 No.1
The influences of N and Xe ion irradiation on the giant magnetoimpedance (GMI) effect and its magnetic response in Co<SUB>69</SUB>Fe<SUB>4.5</SUB>Al<SUB>1.5</SUB>Si<SUB>10</SUB>B<SUB>15</SUB> amorphous ribbons were systematically investigated. A large enhancement of the GMI effect and its magnetic response were achieved in N and Xe ion-irradiated amorphous ribbons. At a frequency of 3MHz, the GMI ratio and magnetic response for an N-ion-irradiated amorphous ribbon respectively reached the highest values of 130% and 13%/Oe, while for a non-irradiated amorphous ribbon they were only about 53% and 8%/Oe. The enhancement of the GMI effect and magnetic response in the ion-irradiated amorphous ribbons resulted from the enhancement of the permeability due to rotational magnetization. Our studies indicate that low energy ion irradiation is useful for improving the magnetic softness, GMI and magnetic response of amorphous alloys, which is of practical importance for the development of high-performance magnetic sensors.