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Lu C.-J.,Soochow University of China | Li H.,Soochow University of China | Xu Q.-F.,Soochow University of China | Xu Q.-H.,National University of Singapore | And 2 more authors.
ChemPlusChem | Year: 2015

A new atom-transfer radical polymerization (ATRP) initiator 4-[1-(2-dodecyl-1,3-dioxo-2,3-dihydro-1H-benzo[de]isoquinolin-6-yl)-3-(4-nitrophenyl)-4,5-dihydro-1H-pyrazol-5-yl]phenyl 2-bromo-2-methylpropanoate (IN) as an electron acceptor (A) and a monomer 2-(9H-carbazole-9-yl)-ethyl methacrylate (MCz) as an electron donor (D) were simultaneously introduced into two different D-A polymer systems by using the end-functionalizing or blending method. The mass percentage of IN in the end-functionalized polymer PMCz-IN and the mixed polymer composite PMCz+IN were both controlled at approximately 1.0wt. The optical, electrochemical, and surface morphology properties of the two polymeric films prepared by means of spin-coating technology were comparatively investigated. Sandwich devices based on PMCz-IN and PMCz+IN demonstrated nonvolatile write-once-read-many-times memory (WORM) and volatile static random access memory (SRAM) characteristics, respectively, which were further verified by the Kelvin probe force microscopy (KPFM) measurements. The proposed memory mechanism could be attributed to the formation of a stable charge-transfer (CT) complex for PMCz-IN and an unstable CT complex for PMCz+IN. Furthermore, the different distribution of IN in the two polymeric films might be the main reason for the stability of the CT complex. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Xing Q.,Soochow University of China | Li N.,Soochow University of China | Li N.,State Key Laboratory Of Treatments And Recycling For Organ Effluents By Adsorption In Petroleum And Chemical Industrial | Jiao Y.,Soochow University of China | And 6 more authors.
RSC Advances | Year: 2015

Herein, a core-shell nanocomposite was fabricated by self-assembly of the photo-responsive copolymer with silica-coated upconversion nanoparticles for near-infrared light-controlled drug release and cancer therapy. Firstly, lanthanide upconversion nanoparticles (UCNPs) co-doped with Yb3+ and Tm3+ were encapsulated with mesoporous silica as the core (MUCNPs). Then a folate conjugated light-responsive copolymer (PSMN-FA) was synthesized and coated on MUCNP as the shell via self-assembly. Anticancer drugs could be loaded into the mesopores of the silica layer before polymer coating. Upon nearinfrared (NIR) light irradiation at 980 nm, the caged UCNPs emitted luminescence in the UV region, which could change the structure of the amphiphilic copolymer and separate it from the MUCNPs, immediately followed by the release of the pre-loaded drugs to the targeted cancer cells. Our model experiments in vitro verified that the nanocarrier MUCNPs@C18@PSMN-FAcan provide active tumor targeting to folate receptor over-expressed (FR+) tumor cells. Both in vitro and in vivo studies were carried out to evaluate the NIR-controlled drug release strategy and the promising application in anticancer therapy based on the polymer-UCNPs nanocomposites. © The Royal Society of Chemistry 2015. Source

Qiu X.,Soochow University of China | Li N.,Soochow University of China | Li N.,State Key Laboratory Of Treatments And Recycling For Organ Effluents By Adsorption In Petroleum And Chemical Industrial | Yang S.,Soochow University of China | And 7 more authors.
Journal of Materials Chemistry A | Year: 2015

A core-shell structured, magnetic nanocomposite (SDMA) modified by a new organic fluorescent probe and selective chelating groups was prepared for simultaneous detection and removal of low Cu2+ concentrations. A series of experiments was designed to detect and adsorb copper ions in aqueous solution via SDMA. Results showed that SDMA could detect Cu2+ from copper ion solution qualitatively and quantifiably with a certain degree of selectivity, and remove Cu2+ with a respectable removal efficiency of about 80%. In comparative adsorption experiments, the adsorption capacity of SDMA was significantly higher than that of another two common magnetic nanoadsorbents (Fe3O4@mSiO2-SH and Fe3O4@mSiO2-NH2). The adsorption behavior of SDMA was studied through equilibrium and kinetic experiments. The adsorption isotherm was perfectly fitted via the Freundlich model and the pseudo-second-order model could fit the kinetic adsorption. Moreover, the SDMA could reach the adsorption equilibrium in only 20 min, which showed a fast kinetic adsorption to Cu2+. Prepared SDMA can be an effective and potential nanoadsorbent for detecting and removing copper ions from wastewater. © The Royal Society of Chemistry 2015. Source

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