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Bach, Long Giang,Ho, Van Thi Thanh,Quynh, Bui Thi Phuong,Lim, Kwon Taek,Anh, Thieu Cam American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.8
<P>The structurally well-defined diblock copolymer, poly(methyl methacrylate)-b-poly(N-isopropylacrylamide) (PMMA-b-PNIPAM) amphiphilic diblock copolymer was successfully grafted onto the surface of Halloysite nanotubes (HNTs) via reversible addition-fragmentation chain transfer (RAFT) polymerization. In this approach, S-benzyl S'-trimethoxysilylpropyltrithiocarbonate was first immobilized onto the HNTs as the RAFT agent. The polymerization of MMA and NIPAM was then initiated and propagated on the HNTs surface by RAFT polymerization. The chemical structure and morphology of diblock copolymer grafted onto the HNTs surface were ascertained by FT-IR, and FE-SEM analyses. A moderate degree of functionalization of HNTs by polymer chains was obtained according to TGA results. This study has suggested a facile approach to prepare surface functionalized HNTs via RAFT polymerization, which is promising to open up a wider prospect for the fabrication and novel application of hybrid polymeric materials with diverse functionalities.</P>
Bach, Long Giang,Islam, M Rafiqul,Hong, Seong-Soo,Lim, Kwon Taek American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>A facile approach was employed for the preparation of stable luminescent nanocomposites of CdS quantum dots (QDs) and polyacrylamide (PAM) through the cross coupling chemistry. Initially, CdS QDs were synthesized in a well controlled manner using 3-mercaptopropionic acid as a capping agent. Then, carboxylic acid groups on CdS QDs were chemically incorporated into PAM matrices with the assistance of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride and N-hydroxysulfosuccinimide coupling agents. FT-IR analysis was used to investigate the chemical incorporation of CdS QDs in PAM matrices via the covalent protocol. The XPS elemental mapping studies further suggested the formation of CdS-PAM nanocomposites. FE-SEM and TEM images were engaged to study the morphologies, and distribution of CdS QDs in the PAM networks. The physical structure of the CdS-PAM nanocomposites was investigated by XRD analysis. Thermal stability of the nanocomposites was observed to be enhanced in compare to PAM as evidenced from TGA data. The UV-vis and photoluminescence studies of the CdS-PAM nanocomposites suggested their promising optical applications.</P>
A facile route towards the synthesis of polystyrene/zinc oxide nanocomposites.
Bach, Long Giang,Islam, M Rafiqul,Kim, Yong Hun,Seo, Sung Deok,Park, Chan,Kim, Hyun Gyu,Lim, Kwon Taek American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.1
<P>ZnO nanoparticles were covalently wrapped by polystyrene (PS) through surface thiol-lactam initiated radical polymerization using the grafting from approach. The surface of ZnO nanoparticles was initially modified by 3-mercapto propyltrimethoxysilane to afford thiol functionalized ZnO nanoparticles (ZnO-SH). The controlled radical polymerization of styrene (St) was subsequently accomplished by using an initiating system of ZnO-SH and butyrolactam. FT-IR, XPS, XRD, TGA, DSC, TEM and DLS were employed to investigate the chemical structure, morphology, thermal properties, the size and size distribution of nanocomposites. The dispersibility of ZnO nanoparticles was observed to be significantly improved upon functionalization by PS brushes. The controlled nature of the surface initiated thiol-lactam aided polymerization of St from the ZnO nanoparticles surface was confirmed by GPC analysis.</P>
Bach, Long Giang,Islam, Md. Rafiqul,Gal, Yeong Soon,Lim, Kwon Taek American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>An approach to the surface modification of TiO2 nanoparticles was described based on the thiol functionalization of TiO2 followed by thiol-lactam initiated radical polymerization (TLIRP) of methyl methacrylate (MMA). FT-IR, XRD and XPS analyses confirmed the grafting of the polymer on the TiO2 surface. TGA analysis revealed superior thermal stability of PMMA-g-TiO2 compared with PMMA. TEM measurements and time-dependent phase monitoring suggested much higher colloidal stability of PMMA-g-TiO2 than TiO2 in toluene. The controlled nature of the TLIRP of MMA from the surface of TiO2 was determined by GPC analysis.</P>