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Synthesis of an AIE-active fluorogen and its application in cell imaging

science China Chemistry 2009年第1期52卷 15-19页

作者： LAM Jacky Wing Yip FAISAL Mahtab NG Ka Ming LUO Kathy Qian Department of Chemistry The Hong Kong University of Science & Technology (HKUST) Clear Water Bay Department of Chemical and Biomolecular Engineering HKUST Clear Water Bay Bioengineering Graduate Program HKUST Clear Water Bay

A fluorogen named 1-decyl-1-methyl-2,5-bis{4-[(N,N-diethylamino)methyl]phenyl}-3,4-diphenylsilole (3) was synthesized. It emitted weakly as isolated molecule but strongly as supramolecular aggregate, showing a characteristic behavior of aggregation-induced emission (AIE). The molecules of 3 formed highly emissive nanoparticles in aqueous media, which quickly and selectively marked cytoplasm of HeLa cells and posed no toxicity to the living cells. The fluorogen is thus a promising candidate mate-rial for cell imaging as a sensitive, selective and cytocompatible biosensor.

关键词： aggregation-induced emission biosensor cell imaging

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Bionanotechnology: Enhancement of Aggregation‐Induced Emission in Dye‐Encapsulating polymeric Micelles for Bioimaging (Adv. Funct. Mater. 9/2010)

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Advanced Functional Materials 2010年第9期20卷

作者： Wen‐Chung Wu Ching‐Yi Chen Yanqing Tian Sei‐Hum Jang Yuning Hong Yang Liu Rongrong Hu Ben Zhong Tang Yi‐Ting Lee Chin‐Ti Chen Wen‐Chang Chen Alex K.‐Y. Jen Department of Materials Science and Engineering Box 352120 University of Washington Seattle WA 98195‐2120 (USA) Department of Chemistry The Hong Kong University of Science & Technology Clear Water Bay Kowloon Hong Kong (China) Institute of Chemistry Academia Sinica Taipei 115 (Taiwan) Department of Chemical Engineering and Institute of Polymer Science and Engineering National Taiwan University Taipei 106 (Taiwan)

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Influences of different TiO2 morphologies and solvents on the photovoltaic performance of dye-sensitized solar cells

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Journal of Power Sources 2009年第2期188卷 635-641页

作者： Lee, Kun-Mu Suryanarayanan, Vembu Ho, Kuo-Chuan Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Electro Organic Division Central Electrochemical Research Institute Karaikudi 630 006 Tamil Nadu India Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan

The effects of TiO2 photoelectrode's surface morphology and different solvents on the photovoltaic performance of dye-sensitized solar cells (DSSCs) were studied. By successive coating of TiO2 suspension, composed of low and high molecular weight poly(ethylene)glycol (PEG) as a binder, double layered TiO2 photoelectrodes with four different structures were obtained. Among the DSSCs with different TiO2 electrodes, DSSC with P2P1 electrode (P2 and P1 correspond to PEG molecular weights of 20,000 and 200,000, respectively) showed higher performance under identical film thickness at a constant irradiation of 100 mW cm-2, which may be correlated with large pore size and high surface area of the corresponding TiO2 electrode. This was confirmed by electrochemical impedance spectroscopy (EIS) analysis of the DSSC and the transient photovoltage measurement of electrons in the TiO2 electrode. Among the different solvents investigated here, the DSSC containing acetonitrile showed high conversion efficiency and the order of performance of the DSSCs with different solvents were AN > MPN > PC > GBL > DMA > DMF > DMSO. Better correlation was observed between the donor number of solvents and photoelectrochemical parameters of the DSSCs containing different solvents rather than the measured viscosity and dielectric constant of solvents. The reasons for the low performance of the DSSCs containing DMA, DMSO and DMF, respectively, were due to the negative shift of TiO2 conduction band and the desorption of dye molecules from the TiO2 photoelectrode by those solvents. © 2008 Elsevier B.V. All rights reserved.

关键词： Titanium dioxide

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polymer actuator based on PVA/PAMPS ionic membrane: Optimization of ionic transport properties

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Sensors and Actuators, A: Physical 2009年第1期155卷 152-162页

作者： Dai, Chi-An Chang, Chun-Jie Kao, An-Cheng Tsai, Wei-Bor Chen, Wen-Shiang Liu, Wei-Ming Shih, Wen-Pin Ma, Chien-Ching Department of Chemical Engineering Taipei 106 Taiwan Institute of Polymer Science and Engineering Taipei 106 Taiwan Department of Physical Medicine and Rehabilitation National Taiwan University Hospital Taipei 106 Taiwan Department of Mechanical Engineering National Taiwan University Taipei 106 Taiwan Institute of Biomedical Engineering National Taiwan University Taipei 106 Taiwan Taiwan Adventist Hospital Taipei 106 Taiwan

In this study, a new ionic network membrane based on blends of water soluble poly (vinyl alcohol) (PVA) and highly ionic conductive poly 2-acrylamido-2-methyl-1-propanesulfonic acid (PAMPS) was synthesized to develop electroactive polymer as artificial muscle. The fabricated ionic polymer-metal composites (IPMCs) membrane actuator in cantilever beam geometry showed a large bending movement (>100°) and maintained curl-up under constant voltage. This property is in sharp contrast with that of IPMC made from Nafion®. A physically crosslinked ionic network was formed when PVA/PAMPS blend membrane was heat treated at high temperatures above 60 °C. The effect of heat treatment temperature, PVA/PAMPS blend ratio and membrane sample dimension on the electrical and mechanical performance of the resulting IPMC actuator was investigated. The water uptake and ionic conductivity of PVA/PAMPS membrane scale linearly with its ion exchange capacity which in turn is determined by the PVA/PAMPS blend ratio. Optimal blend ratio and sample geometry for the IPMC membrane actuator was obtained to give maximum bending movement and generative blocking force. The mechanical performance of the IPMC actuator is correlated with the transport property of its PVA/PAMPS ionic network membrane. © 2009 Elsevier B.V. All rights reserved.

关键词： Ion exchange

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Well-defined micropatterns of polymers prepared by controlled crystallization process

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中国高等学校学术文摘·化学 2009年第4期4卷 383-389页

作者： Jijun WANG Yinjie SUN Yun HUANG Erqiang CHEN Huihui LI Shouke YAN State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Department of Polymer Science School of ChemistryPeking UniversityBeijing 100871China

Surface confined recrystallization of highly-oriented polyethylene (PE) thin films realized by carbon-coating was utilized to control the morphological structure of ultrathin PE films. Selective carbon-coating with the help of a mask and subsequent recrystallization of the pre-oriented PE thin film lead to a partially structural control of the PE thin film in the coated domains. A fully structural control of the PE film is then fulfilled through a combination of surface confinement and heteroepitaxy of PE on the oriented poly(tetrafluroethylene) (PTFE) thin film. The thus obtained structure can serve as a template to induce pattern structures of a variety of other polymers through epitaxial growth. The poly(ε-caprolactone) (PCL) and poly(butylenes adipate) (PBA) micropattern thin films are shown in this paper as examples. These thin films exhibit different birefringence in different regions depending on the molecular orientation and may find potential applications in the fields of polarization-dependent display or storage.

关键词： polymers epitaxy surface confinement cystallization micropattern

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Macromol. Rapid Commun. 7/2010

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Macromolecular Rapid Communications 2010年第7期31卷

作者： Yiu‐Ting Richard Lau Lu‐Tao Weng Kai‐Mo Ng Manuel Kempf Volker Altstädt Jerold M. Schultz Chi‐Ming Chan Department of Chemical and Biomolecular Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Materials Characterization and Preparation Facility Hong Kong University of Science and Technology Clear Water Bay Hong Kong Advanced Engineering Materials Facility Hong Kong University of Science and Technology Clear Water Bay Hong Kong Department of Polymer Engineering University of Bayreuth Universitätsstrasse 30 D‐95440 Bayreuth Germany Department of Chemical Engineering University of Delaware Newark DE 19716 USA

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All-conjugated diblock copolymer of poly(3-hexylthiophene)-block-poly(3-phenoxymethylthiophene) for field-effect transistor and photovoltaic applications

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Organic Electronics 2009年第8期10卷 1541-1548页

作者： Chueh, Chu-Chen Higashihara, Tomoya Tsai, Jung-Hsun Ueda, Mitsuru Chen, Wen-Chang Department of Chemical Engineering National Taiwan University Taipei 106 Taiwan Department of Organic and Polymeric Materials Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan Institute of Polymer Science and Engineering National Taiwan University Taipei 106 Taiwan

The electronic properties, morphology and optoelectronic device characteristics of conjugated diblock copolythiophene, poly(3-hexylthiophene)-block -poly(3-phenoxymethylthiophene) (P3HT-b-P3PT), are firstly reported. The polymer properties and structures were explored through different solvent mixtures of chloroform (CHCl3), dichlorobenzene (DCB), and CHCl3:DCB (1:1 ratio). The absorption maximum (λmax) of P3HT-b-P3PT prepared from DCB was around 554 nm with a shoulder peak indicative for the highly crystalline structure around 604 nm while that from CHCl3 was 516 nm without the clear shoulder peak. The field-effect hole mobility of P3HT-b-P3PT increased from ∼6.0 × 10-3, ∼8.0 × 10-3 to ∼2.0 × 10-2 cm2 V-1 s-1 as the DCB content in the solvent mixture enhanced. The AFM images suggested that the highly volatile CHCl3 processing solvent led to the amorphous structure, on the other hand, less volatile DCB resulted in the largely crystalline structure of the P3HT-b-P3PT. Such difference on the polymer structure and hole mobility led to the varied power conversion efficiency (PCE) of the photovoltaic cells fabricated from the blend of P3HT-b-P3PT/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) (1:1, w/w): 1.88 (CHCl3), 2.13 (CHCl3:DCB (1:1)), and 2.60% (DCB). The PCBM blend ratio also significantly affected the surface structure and the solar cell performance. The PCE of polymer/PCBM could be improved to 2.80% while the ratio of polymer to PCBM went to 1:0.7. The present study suggested that the surface structures and optoelectronic device characteristics of conjugated diblock copolymers could be easily manipulated by the processing solvent, the block segment characteristic, and blend composition. © 2009 Elsevier B.V. All rights reserved.

关键词： Solar cells

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Annealing effect of polymer bulk heterojunction solar cells based on polyfluorene and fullerene blend

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Organic Electronics 2009年第1期10卷 27-33页

作者： Huang, Jen-Hsien Yang, Chuan-Yi Ho, Zhong-Yo Kekuda, Dhananjay Wu, Meng-Chyi Chien, Fan-Ching Chen, Peilin Chu, Chih-Wei Ho, Kuo-Chuan Department of Chemical Engineering National Taiwan University Taipei Taiwan Institute of Electronic Engineering National Tsing Hua University Hsinchu Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei Taiwan Research Center for Applied Sciences Academia Sinica Taipei Taiwan Department of Photonics National Chiao Tung University Hsinchu Taiwan

Control of blend morphology at the nanoscale and high charge mobility is essential for polymer photovoltaic devices in terms of their power conversion efficiencies (PCE). In the case of bulk heterojunctions solar cells, both blend morphology and charge mobility are influenced by thermal treatment. In this manuscript, we study the effects of annealing temperature on polymer PV devices with blends of poly[9,9'- dioctyl-fluorene-co-bithiophene] (F8T2) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The morphological changes of blended films were observed upon thermal annealing temperature near and above glass transition temperature (130 °C). Such microstructural transformations resulted in modified charge transport pathways and therefore greately influenced the device performance. The highest PCE of 2.14% with an open-circuit voltage (VOC) of 0.99 V and a short-circuit current (JSC) of 4.24 mA/cm2 was achieved by device annealing at 70 °C for 20 min. © 2008 Elsevier B.V. All rights reserved.

关键词： Open circuit voltage

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Synthesis and memory device characteristics of new sulfur donor containing polyimides

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Macromolecules 2009年第13期42卷 4456-4463页

作者： You, Nam-Ho Chueh, Chu-Chen Liu, Cheng-Liang Ueda, Mitsuru Chen, Wen-Chang Department of Organic and Polymeric Materials Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan Department of Chemical Engineering National Taiwan University Taipei 106 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei 106 Taiwan

The synthesis and memory device characteristics of two new poly [2,7-bis(phenylenesulfanyl) thianthrene-hexafluoroisopropylidenediphthalimide] (APTT-6FDA) and poly[4,4'-thiobis(p-phenylenesulfanyl)- hexafluoroisopropylidenediphthalimide] (3SDA-6FDA) are reported. The sulfur-containing APTT and 3SDA as electron donor were designed to enhance electron-donating and charge-transporting characteristics for the device application. The optical band gaps of APTT-6FDA and 3SDA-6FDA estimated from the absorption edges were 3.51 and 3.46 eV, which probably resulted from the difference in the structural coplanarity. The estimated energy levels (HOMO, LUMO) of APTT-6FDA and 3SDA-6FDA were (-5.55, -2.04) and (-5.71, -2.25) eV, respectively. The memory device with the configuration of ITO/polymers/Al showed nonvolatile memory characteristics with the low turn-on threshold voltages of 1.5 V(APTT-6FDA) and 2.5 V(3SDA-6FDA), probably resulting from the difference in the HOMO energy level. Also, the memory devices could be repeatedly written, read, and erased. The on/off current ratios of the devices were all around 104 in ambient atmosphere. The relatively higher dipole moments of the sulfur-containing polyimides compared to the triphenylamine-based polyimide provided a stable CT complex for the flash memory device. The above electronic properties were further confirmed by the density functional theory (DFT) method at the B3LYP level with the 6-31G(d) basis set. The present study suggested that the new sulfur-containing polyimides would have potential applications for memory devices. © 2009 American chemical Society.

关键词： Sulfur

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Treatment of alkaline wastewater from cleaning of color filter glass

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Journal of the Taiwan Institute of chemical Engineers 2009年第6期40卷 663-668页

作者： Ji, Dar-Ren Chang, Chia-Chi Chang, Ching-Yuan Tu, Wen-Kai Tseng, Jyi-Yeong Chiu, Chun-Yu Chen, Yi-Hung Chang, Chiung-Fen Hsieh, Kuo-Huang Liu, Wen-Bin Graduate Institute of Environmental Engineering National Taiwan University Taipei 10617 Taiwan Department of Cosmetic Science and Application Lan-Yang Institute of Technology I-Lan 261 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei 106 Taiwan Department of Environmental Science and Engineering Tung-Hai University Taichung 40704 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Benten Tech. Co. Hsinchu 300 Taiwan

The treatment of alkaline wastewater (noted as A-water) from cleaning of color filter glass (CFG) was studied. The A-water contains hydroxide ion and dissolved acrylic resin of high concentrations of 4 M and 80,446 mg/L chemical oxygen demand (COD), respectively. The suspended solid (SS) of A-water was removed via filtration. The effluent after filtration process (noted as F-water) was further treated via advanced oxidation processes (AOPs) such as ozonation (OZ), OZ/ultra-violet (UV) irradiation (OZ/UV) and catalytic OZ/UV with Pt/γ-Al2O3 (OZ/UV/Pt). The filtration process employing 0.5 μm PTFE filter yielded the F-water containing 55,749 mg/L COD with the removal efficiency of COD (ηC) relative to A-water (ηC,FA) of about 30.7% for treating the A-water. It was noted that about 33.7% COD of A-water can be also removed using the gravity sedimentation (GS). However, the GS time was as long as about 7.5 h. The values of ηC relative to F-water (ηC,OF) via AOPs for treating the F-water were about 8-12% at the reaction time of 60 h. The overall ηC relative to A-water (ηC,OA) can reach about 36.2-39.1% after filtration process and AOPs. © 2009 Taiwan Institute of chemical Engineers.

关键词： Ozone

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