1
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Chao JH, Chuang CY, Chou WC, Kuo CL, Chang FC, Chiang AC. Optimization of alkali fusion process for determination of I-129 in solidified radwastes by neutron activation. Appl Radiat Isot 2021; 176:109762. [PMID: 34147847 DOI: 10.1016/j.apradiso.2021.109762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 03/25/2021] [Accepted: 04/27/2021] [Indexed: 11/28/2022]
Abstract
This study determines the optimum temperature for the alkali fusion process used to effectively separate iodine from solidified radwaste attaining low-level 129I by neutron activation. The alkali fusion temperature was adjusted to 120, 200, and 400 °C to approach the optimum conditions associated with a good statistical distribution of the measured 129I data and high chemical recovery yield. Statistical analysis revealed that the optimum temperature of the alkali fusion process was 200 °C, displaying good central tendency and low variance of the measured 129I data, and the respective chemical recovery yields were higher than other temperatures. The optimum fusion condition provides more reliable scaling factors (129I/137Cs) of radwaste.
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Affiliation(s)
- Jiunn-Hsing Chao
- Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu, 30013, Taiwan, ROC.
| | - Chun-Yu Chuang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, 30013, Taiwan, ROC
| | - Wei-Chun Chou
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, 30013, Taiwan, ROC; Institute of Computational Comparative Medicine, Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
| | - Chun-Liang Kuo
- Department of Nuclear Medicine, Hsinchu Mackay Memorial Hospital, Hsinchu, 30071, Taiwan, ROC
| | - Feng-Chih Chang
- Chemical Division, Institute of Nuclear Energy Research, Longtan, 32546, Taiwan, ROC
| | - An-Chung Chiang
- Nuclear Science and Technology Development Center, National Tsing Hua University, Hsinchu, 30013, Taiwan, ROC
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2
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Hsiao J, Yuan TY, Tsai MS, Lu CY, Lin YC, Lee ML, Lin SW, Chang FC, Liu Pimentel H, Olive C, Coito C, Shen G, Young M, Thorne T, Lawrence M, Magistri M, Faghihi MA, Khorkova O, Wahlestedt C. Upregulation of Haploinsufficient Gene Expression in the Brain by Targeting a Long Non-coding RNA Improves Seizure Phenotype in a Model of Dravet Syndrome. EBioMedicine 2016; 9:257-277. [PMID: 27333023 PMCID: PMC4972487 DOI: 10.1016/j.ebiom.2016.05.011] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 05/02/2016] [Accepted: 05/09/2016] [Indexed: 02/07/2023] Open
Abstract
Dravet syndrome is a devastating genetic brain disorder caused by heterozygous loss-of-function mutation in the voltage-gated sodium channel gene SCN1A. There are currently no treatments, but the upregulation of SCN1A healthy allele represents an appealing therapeutic strategy. In this study we identified a novel, evolutionary conserved mechanism controlling the expression of SCN1A that is mediated by an antisense non-coding RNA (SCN1ANAT). Using oligonucleotide-based compounds (AntagoNATs) targeting SCN1ANAT we were able to induce specific upregulation of SCN1A both in vitro and in vivo, in the brain of Dravet knock-in mouse model and a non-human primate. AntagoNAT-mediated upregulation of Scn1a in postnatal Dravet mice led to significant improvements in seizure phenotype and excitability of hippocampal interneurons. These results further elucidate the pathophysiology of Dravet syndrome and outline a possible new approach for the treatment of this and other genetic disorders with similar etiology.
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Affiliation(s)
- J Hsiao
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - T Y Yuan
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - M S Tsai
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 1, Sec. 1, Jen-Ai Rd., Taipei 100, Taiwan
| | - C Y Lu
- Department of Veterinary Medicine, School of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan
| | - Y C Lin
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - M L Lee
- Dep. Clinical Laboratory Science and Medical Biotechnology, National Taiwan University Hospital, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - S W Lin
- Department of Clinical Laboratory Sciences and Medical Biotechnology, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 1, Sec. 1, Jen-Ai Rd., Taipei 100, Taiwan; Department of Laboratory Medicine, National Taiwan University Hospital, College of Medicine, National Taiwan University, No. 7, Chung-Shan S. Rd., Taipei 100, Taiwan; Center for Genomic Medicine, National Taiwan University, No. 7, Chung-Shan S. Rd., Taipei 100, Taiwan
| | - F C Chang
- Department of Veterinary Medicine, School of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan; Graduate Institute of Brain and Mind Sciences, College of Medicine, National Taiwan University, No. 1, Sec. 1, Jen-Ai Rd., Taipei 100, Taiwan; Graduate Institute of Acupuncture Science, College of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - H Liu Pimentel
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - C Olive
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - C Coito
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - G Shen
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - M Young
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - T Thorne
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - M Lawrence
- RxGen, 100 Deepwood Drive, Hamden, CT 06517, USA
| | - M Magistri
- Center for Therapeutic Innovation and the Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, 1501 NW 10th Avenue, Miami 33136, FL, USA
| | - M A Faghihi
- Center for Therapeutic Innovation and the Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, 1501 NW 10th Avenue, Miami 33136, FL, USA
| | - O Khorkova
- OPKO Health Inc., 10320 USA Today Way, Miramar, FL 33025, USA
| | - C Wahlestedt
- Center for Therapeutic Innovation and the Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, 1501 NW 10th Avenue, Miami 33136, FL, USA.
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3
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Cheng CC, Chang FC, Kao WY, Hwang SM, Liao LC, Chang YJ, Liang MC, Chen JK, Lee DJ. Highly efficient drug delivery systems based on functional supramolecular polymers: In vitro evaluation. Acta Biomater 2016; 33:194-202. [PMID: 26796210 DOI: 10.1016/j.actbio.2016.01.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 01/07/2016] [Accepted: 01/18/2016] [Indexed: 12/29/2022]
Abstract
The novel concept of modifying and enhancing the properties of existing functional micelles through self-complementary interactions has significant potential. In this study, a practical approach to living polymerization of functionalized thermoresponsive monomers enabled the incorporation of self-constituted multiple hydrogen bonded groups into micelles that have potential as supramolecular drug-delivery systems. Phase transitions and morphological studies in aqueous solution showed that the microstructure can be controlled to achieve well-defined vesicle-like micelles with respect to the strength of the hydrogen bond segment. Thus, the resulting micelles have a very low critical micellization concentration and very high loading capacity (16.1%), making the loading process extremely stable and efficient. Incorporation of the anticancer drug doxorubicin (DOX) affected the micellization process in aqueous solution and enabled fine-tuning of drug loading and precise control of drug release rate with excellent sensitivity. Release studies in vitro showed that DOX-loaded micelles exerted dose-dependent cytotoxicity against human liver carcinoma (HepG2) cells at the physiological temperature of 37°C. In addition, DOX-loaded micelles were efficiently endocytosed by the cancer cells, which may enable the micelles to serve as suitable vehicles for effective delivery of anticancer drugs to primary tumors and metastatic disease. This newly developed material may provide a potential route towards next-generation drug delivery vehicles. STATEMENT OF SIGNIFICANCE A breakthrough innovation in water-based thermo-responsive polymers has enabled significant progress in developing smart stimuli-responsive nanocarriers by generating novel "supramolecular polymeric micelles" via self-complementary hydrogen-bonding interactions. These newly developed micelles exhibit extremely high micellar stability and drug loading capacity (up to 16%), excellent thermo-responsive behavior and precise control of drug release rate due to hydrogen-bond-induced physical cross-linking. In addition, doxorubicin-loaded micelles were efficiently endocytosed by the cancer cells, which allows them to serve as suitable vehicles for effective delivery of anticancer drugs to primary tumors and metastatic disease. Thus, this work provides a potential route for the development of next generation multifunctional nanocarriers that have improved safety and to increase the therapeutic efficacy of anticancer therapy.
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4
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Cheng CC, Chang FC, Wang JH, Chen JK, Yen YC, Lee DJ. Functionalized graphene nanomaterials: new insight into direct exfoliation of graphite with supramolecular polymers. Nanoscale 2016; 8:723-728. [PMID: 26660032 DOI: 10.1039/c5nr07076g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel urea-cytosine end-capped polypropylene glycol (UrCy-PPG) can self-assemble into a long-range ordered lamellar microstructure on the surface of graphene, due to the strong specific interactions between UrCy-PPG and graphene. In addition, the graphene composite produced exhibits a high conductivity (∼1093 S m(-1)) with a dramatic thermo-responsive ON/OFF resistance-switching behavior (10 consecutive cycles).
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Feng-Chih Chang
- Institute of Applied Chemistry, National Chiao Tung University, HsinChu 30050, Taiwan
| | - Jui-Hsu Wang
- Institute of Applied Chemistry, National Chiao Tung University, HsinChu 30050, Taiwan
| | - Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Ying-Chieh Yen
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan and Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
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5
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Cheng CC, Chang FC, Yen HC, Lee DJ, Chiu CW, Xin Z. Supramolecular Assembly Mediates the Formation of Single-Chain Polymeric Nanoparticles. ACS Macro Lett 2015; 4:1184-1188. [PMID: 35614803 DOI: 10.1021/acsmacrolett.5b00556] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A breakthrough innovation in water-based polymeric nanoparticles has enabled significant progress in mimicking the folding of natural proteins by generating novel "single-chain polymeric nanoparticles" (SCPNs) via supramolecular interactions. In this study, a practical approach to the living polymerization of functionalized oligo(ethylene glycol) methacrylate monomers allows the incorporation of self-constituted multiple hydrogen-bonded groups into physically cross-linked polymer networks, which enables the formation of highly functionalized SCPNs in an aqueous environment. The newly developed materials are particularly attractive from a practical point of view since they have a very low critical micellization concentration and uniform particle diameters of ca. 25 nm, making them extremely stable under dilute conditions. Concentration-dependent experiments showed that SCPNs formed at polymer concentrations up to 40 mg/mL with no significant change in morphology observed. Moreover, the formed SCPNs had a very high stability in an aqueous solution containing surfactant, suggesting potential for a wide variety of applications as a promising candidate nanocarrier for bioimaging, controlled release, and drug delivery systems.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science
and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Feng-Chih Chang
- Institute
of Applied Chemistry, National Chiao Tung University, Hsin Chu 30050, Taiwan
| | - Hsiu-Che Yen
- Institute
of Applied Chemistry, National Chiao Tung University, Hsin Chu 30050, Taiwan
| | - Duu-Jong Lee
- Department of Chemical
Engineering, National Taiwan University, Taipei 10617, Taiwan
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Chih-Wei Chiu
- Department of Materials Science
and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Zhong Xin
- State Key Laboratory
of Chemical
Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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6
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Cheng CC, Wang YS, Chang FC, Lee DJ, Yang LC, Chen JK. Supramolecular assembly-induced enhanced emission of electrospun nanofibers. Chem Commun (Camb) 2015; 51:672-5. [PMID: 25415758 DOI: 10.1039/c4cc07971j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nucleobase-assembled supramolecular nanofiber is capable of forming network-like polymeric clusters through complementary hydrogen-bonding interactions. It behaves as an effective chromophore that greatly enhances the light emission efficiency of fluorescent fibers, reaching up to three times higher efficiency than the control samples.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
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7
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Xu Y, Xie J, Gao H, Cao Y, Chen M, Liu Y, Zeng B, Chang FC, Dai L. Interpenetration enhancing of Chitosan-PEGLM double network (DN) hydrogel and its properties. Macromol Res 2015. [DOI: 10.1007/s13233-015-3012-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Abstract
Self-healing supramolecular polymers can be rapidly reprocessed under mild temperature conditions via dynamic reshuffling of the hydrogen bond networks.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Feng-Chih Chang
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsinchu 30050
- Taiwan
| | - Shenghong A. Dai
- Department of Chemical Engineering
- National Chung-Hsin University
- Taichung 40227
- Taiwan
| | - Yu-Li Lin
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsinchu 30050
- Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
- Department of Chemical Engineering
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9
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Shih HK, Chu YL, Chang FC, Zhu CY, Kuo SW. A cross-linkable triphenylamine derivative as a hole injection/transporting material in organic light-emitting diodes. Polym Chem 2015. [DOI: 10.1039/c5py00882d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new thermally cross-linkable triphenylamine derivative containing a benzoxazine functional group for application in organic light-emitting diodes (OLEDs.)
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Affiliation(s)
- Hsi-Kang Shih
- Institute of Applied Chemistry
- National Chiao Tung University
- HsinChu
- 300 Taiwan
| | - Yu-Lin Chu
- Institute of Applied Chemistry
- National Chiao Tung University
- HsinChu
- 300 Taiwan
| | - Feng-Chih Chang
- Institute of Applied Chemistry
- National Chiao Tung University
- HsinChu
- 300 Taiwan
- Department of Materials and Optoelectronic Science
| | - Chao-Yuan Zhu
- Institute of Applied Chemistry
- National Chiao Tung University
- HsinChu
- 300 Taiwan
| | - Shiao-Wei Kuo
- Department of Materials and Optoelectronic Science
- Center for Nanoscience and Nanotechnology
- National Sun Yat-Sen University
- Kaohsiung
- Taiwan
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10
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Abstract
A new urea–cytosine-functionalized supramolecular polymer can be rapidly reshaped and reprocessed under mild conditions via rearrangement of the hydrogen bonding network.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Feng-Chih Chang
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsin Chu 30050
- Taiwan
| | - Jem-Kun Chen
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei 10607
- Taiwan
| | - Tzu-Yin Wang
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsin Chu 30050
- Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
- Department of Chemical Engineering
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11
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Cheng CC, Chang FC, Wang JH, Chu YL, Wang YS, Lee DJ, Chuang WT, Xin Z. Large-scale production of ureido-cytosine based supramolecular polymers with well-controlled hierarchical nanostructures. RSC Adv 2015. [DOI: 10.1039/c5ra15849d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel UrCy–PPG was developed for the synthesis of high-quality supramolecular polymers in large-scale production utilizing only commercially-available chemicals.
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Affiliation(s)
- Chih-Chia Cheng
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 10607, Taiwan
| | - Feng-Chih Chang
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsin Chu 30050, Taiwan
| | - Jui-Hsu Wang
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsin Chu 30050, Taiwan
| | - Yu-Lin Chu
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsin Chu 30050, Taiwan
| | - Yeh-Sheng Wang
- Institute of Applied Chemistry
- National Chiao Tung University
- Hsin Chu 30050, Taiwan
| | - Duu-Jong Lee
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617, Taiwan
- Department of Chemical Engineering
- National Taiwan University of Science and Technology
| | - Wei-Tsung Chuang
- National Synchrotron Radiation Research Center
- Hsinchu 30076, Taiwan
| | - Zhong Xin
- State Key Laboratory of Chemical Engineering
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai 200237, China
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12
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Chen JK, Zhou GY, Chang CJ, Lee AW, Chang FC. Label-free DNA detection using two-dimensional periodic relief grating as a visualized platform for diagnosis of breast cancer recurrence after surgery. Biosens Bioelectron 2014; 54:35-41. [DOI: 10.1016/j.bios.2013.10.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 10/17/2013] [Accepted: 10/21/2013] [Indexed: 10/26/2022]
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13
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Abstract
New polystyrene (PS)/carbon nanofiber (CNF) and PS/graphite foams with an inter-connected honeycomb-like carbon particulate network of CNF or graphite were prepared by first coating the surface of polymer pellets with either CNF or graphite and then conducting batch foaming using carbon dioxide (CO2) as a blowing agent. It was found that the inter-connected honeycomb-like carbon particulate network could significantly reduce the compression yielding of conventional PS foams. With 1 wt% of CNFs or graphite, the PS foams with inter-connected honeycomb-like carbon particulate network were 5–9 times more electrically conductive than foams made of compounded PS nanocomposite with the same carbon particle loading. In addition, the PS foams with inter-connected honeycomb-like carbon particulate network were more thermally conductive and revealed significantly improved thermal stability comparing to foams made of compounded polymer nanocomposites.
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Affiliation(s)
- Ying-Chieh Yen
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA
- Department of Applied Chemistry, National Chiao Tung University, Taiwan
| | | | | | - Feng-Chih Chang
- Department of Applied Chemistry, National Chiao Tung University, Taiwan
| | - Ly James Lee
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA
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14
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Mohamed MG, Cheng CC, Lin YC, Huang CW, Lu FH, Chang FC, Kuo SW. Synthesis and self-assembly of water-soluble polythiophene-graft-poly(ethylene oxide) copolymers. RSC Adv 2014. [DOI: 10.1039/c4ra02433h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Poly(3-hexylthiophene)-graft-poly(ethylene oxide) (P3HT-g-PEO) rod–coil conjugated random copolymers through oxidative polymerization with FeCl3 and facile click chemistry.
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Affiliation(s)
- Mohamed Gamal Mohamed
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
| | - Chih-Chia Cheng
- Institute of Applied Chemistry
- National Chiao-Tung University
- Hsin-Chu, Taiwan
| | - Yung-Chih Lin
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
| | - Cheng-Wei Huang
- Institute of Applied Chemistry
- National Chiao-Tung University
- Hsin-Chu, Taiwan
| | - Fang-Hsien Lu
- Institute of Applied Chemistry
- National Chiao-Tung University
- Hsin-Chu, Taiwan
| | - Feng-Chih Chang
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
| | - Shiao-Wei Kuo
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
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15
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Lin IH, Cheng CC, Li KF, Chen JK, Chiu CW, Chang FC. Nucleobase-grafted supramolecular polymers for tuning the surface properties. Polym Chem 2014. [DOI: 10.1039/c3py01176c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Omrani A, Yen YC, Cheng CC, Chang FC. Enhanced processability of MWCNT through surface treatment by octa(phenol) polyhedral oligomeric silsesquioxane nano-crosslinking. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.10.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Yuan C, Zeng B, Yu S, Mao J, Chen X, Luo W, Xu Y, Chang FC, Dai L. An airflow-controlled solvent evaporation route to hollow microspheres and colloidosomes. RSC Adv 2014. [DOI: 10.1039/c3ra45758c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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18
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Huang J, Chang FC, Wang S, Han YJ, Castro M, Miller E, Holsen TM. Mercury wet deposition in the eastern United States: characteristics and scavenging ratios. Environ Sci Process Impacts 2013; 15:2321-2328. [PMID: 24190422 DOI: 10.1039/c3em00454f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Wet deposition is an important atmospheric mercury (Hg) pathway between air and terrestrial ecosystems. It is measured at numerous locations in the United States (U. S.) as part of the Mercury Deposition Network (MDN). The annual Hg wet deposition flux in 2009 at four locations in the northeastern U. S. (MDN sites MD08, VT99, NY20, and NY43) ranged from 6.4 to 13.4 μg per m(2) year which is higher than modeled reactive Hg (RM) dry deposition for this region. The highest ambient RM concentrations were seen at MD08, which is closest to significant anthropogenic sources; however, the volume-weighted mean Hg concentrations in precipitation were similar at these four sites. Mass based scavenging ratios (SC) of RM ranged from 1700 to 4500. Differences in SCs were likely a result of differences in meteorological conditions, the forms of RM in the atmosphere, vertical concentration variations, and measurement uncertainties, including precipitation depth and RM concentrations. RM SCs were higher than those reported for other soluble species. Multiple linear regression suggests that gaseous oxidized Hg is responsible for the majority of the scavenged RM.
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Affiliation(s)
- Jiaoyan Huang
- Department of Natural Resources and Environmental Sciences, University of Nevada, Reno, NV 89557, USA
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19
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Aso R, Kurata H, Namikoshi T, Hashimoto T, Kuo SW, Chang FC, Hasegawa H, Tsujimoto M, Takano M, Isoda S. Quantitative Imaging of Tg in Block Copolymers by Low-Angle Annular Dark-Field Scanning Transmission Electron Microscopy. Macromolecules 2013. [DOI: 10.1021/ma4014934] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ryotaro Aso
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Hiroki Kurata
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | | | - Tamotsu Hashimoto
- Graduate
School of Engineering, University of Fukui, Fukui 910-8507, Japan
| | - Shiao-Wei Kuo
- Department
of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
| | - Feng-Chih Chang
- Department
of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
| | - Hirokazu Hasegawa
- Research
Administration Center, Graduate School of Engineering, Kyoto University, Kyoto 615-8245, Japan
| | - Masahiko Tsujimoto
- Institute
for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8501, Japan
| | - Mikio Takano
- Institute
for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8501, Japan
| | - Seiji Isoda
- Institute
for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8501, Japan
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Lin IH, Cheng CC, Chuang WT, Chen JK, Jeng US, Ko FH, Chu CW, Huang CF, Chang FC. Bioinspired assembly of functional block-copolymer nanotemplates. Soft Matter 2013; 9:9608-9614. [PMID: 26029768 DOI: 10.1039/c3sm51870a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new concept on bioinspired assembly of functional diblock copolymers, capable of forming different microstructures through nucleobase-induced supramolecular interactions, has been explored. In this paper, a new series of uracil-functionalized poly(ε-caprolactone)-b-(4-vinylbenzyl uracil)s (PCL-b-PVBU) have been prepared which exhibit a high self-complementary ability in solution and solid states owing to the formation of uracil–uracil pairs by induced hierarchical self-assembly. The ordered morphologies of PCL-b-PVBU diblock copolymers changed from a lamellar, hexagonally packed cylinder to a sphere with respect to the content of the hydrogen bond segment. Moreover, we further show that the PCL segment could be easily extracted by enzymatic degradation, leading to a cylinder porous structure of long-range order, which gives a facile method for the fabrication of uracil-functionalized nanotemplates. In addition, bio-complementary PCL-b-PVBU/9-hexadecyladenine (AC16) hierarchical supramolecular complexes formed through strong cooperative hydrogen bonding between the uracil group of PVBU and the adenine group of A-C16. When the mixing ratios of PCL-b-PVBU/AC16 differ from the stoichiometric ratio, these complexes self-assemble into well-ordered lamellar and hexagonal structures; the changing morphology at different AC16 loadings reveals that the molecular structures of the PCL-b-PVBU/AC16 complexes are readily tailored.
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Affiliation(s)
- I-Hong Lin
- Institute of Applied Chemistry, National Chiao-Tung University, Hsinchu 30050, Taiwan
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Lin CJ, Wu TH, Lin CH, Hung SC, Chiu CF, Liu MJ, Teng MMH, Chang FC, Guo WY, Chang CY. Can iterative reconstruction improve imaging quality for lower radiation CT perfusion? Initial experience. AJNR Am J Neuroradiol 2013; 34:1516-21. [PMID: 23578678 DOI: 10.3174/ajnr.a3436] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Initial results using IR for CT of the head showed satisfactory subjective and objective imaging quality with a 20-40% radiation dose reduction. The aim of our study was to compare the influence of IR and FBP algorithms on perfusion parameters at standard and lowered doses of CTP. MATERIALS AND METHODS Forty patients with unilateral carotid stenosis post-carotid stent placement referred for follow-up CTP were divided into 2 groups (tube currents were 100 mAs in group A and 80 mAs in group B). Datasets were reconstructed with IR and FBP algorithms; and SNRs of gray matter, white matter, and arterial and venous ROIs were compared. CBF, CBV, and MTT means and SNRs were evaluated by using linear regression, and qualitative imaging scores were compared across the 2 algorithms. RESULTS The mean effective radiation dose of group B (2.06 mSv) was approximately 20% lower than that of group A (2.56 mSv). SNRs for ROIs in the dynamic contrast-enhanced images were significantly higher than those for the FBP images. Correlations of the SNRs for CBF, CBV, and MTT across the 2 algorithms were moderate (R² = 0.46, 0.23, and 0.44, respectively). ROIs in gray matter rather than the IR algorithm predicted increasing SNRs in all CBF, CBV, and MTT maps. Two cases of significant restenosis were confirmed in both algorithms. CBV, CBF, and MTT imaging scores did not differ significantly across algorithms or groups. CONCLUSIONS Lower dose CTP (20% below normal dose) without IR can effectively identify oligemic tissue in poststenting follow-up. IR does not alter the absolute values or increase the SNRs of perfusion parameters. Other methods should be attempted to improve SNRs in settings with low tube currents.
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Affiliation(s)
- C J Lin
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan
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Lin IH, Cheng CC, Huang CW, Liang MC, Chen JK, Ko FH, Chu CW, Huang CF, Chang FC. Nucleobase-grafted polycaprolactones as reversible networks in a novel biocompatible material. RSC Adv 2013. [DOI: 10.1039/c3ra41412d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Li CL, Chen JK, Fan SK, Ko FH, Chang FC. Electrorheological operation of low-/high-permittivity core/shell SiO2/Au nanoparticle microspheres for display media. ACS Appl Mater Interfaces 2012; 4:5650-5661. [PMID: 23016596 DOI: 10.1021/am301543h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In this study, we synthesized core/shell structures comprising monodisperse 3-μm SiO(2) microspheres and gold nanoparticles (AuNPs, ca. 6.7 nm) as the core and shell components, respectively. Using a layer-by-layer cross-linking process with a dithiol cross-linking agent, we prepared low-permittivity AuNP-encapsulated high-permittivity SiO(2) core/shell microspheres with variable AuNP shell thicknesses. The dispersivity of the microspheres in solution was enhanced after grafting poly(ethylene glycol) monomethyl ether thiol (PEG-SH) onto the AuNP layer on the SiO(2) microspheres. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images revealed sesame ball-like structures for these SiO(2)@AuNP@PEG microspheres. We encapsulated aqueous dispersions of these SiO(2)@AuNP microspheres into sandwich structured displays (SSDs) to investigate their electrorheological properties, observing reversibly electroresponsive transmittance that is ideally suited for display applications. Increasing the thickness of the AuNP layer dramatically enhanced the stringing behavior of the SiO(2) microspheres, resulting in increased transmittance of the SSD. The response time of the electroresponsive electrorheological fluids also decreased significantly after modifying the SiO(2) with the AuNP layers. The effective permittivities of these composites could be predicted from the real (έ) and imaginary (έ́) parts of the Clausius-Mossotti formalism.
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Affiliation(s)
- Chung-Lin Li
- Department of Materials and Science Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei, 106, Taiwan, Republic of China
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Yen YC, Cheng CC, Tsai JY, Lin IH, Wang YS, Chang FC. Molecular recognition within a poly(amide urethane) system. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.06.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Meena JS, Chu MC, Chang YC, Wu CS, Cheng CC, Chang FC, Ko FH. Novel chemical route to prepare a new polymer blend gate dielectric for flexible low-voltage organic thin-film transistor. ACS Appl Mater Interfaces 2012; 4:3261-3269. [PMID: 22667761 DOI: 10.1021/am3006143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
An organic-organic blend thin film has been synthesized through the solution deposition of a triblock copolymer (Pluronic P123, EO20-PO70-EO20) and polystyrene (PS), which is called P123-PS for the blend film whose precursor solution was obtained with organic additives. In addition to having excellent insulating properties, these materials have satisfied other stringent requirements for an optimal flexible device: low-temperature fabrication, nontoxic, surface free of pinhole defect, compatibility with organic semiconductors, and mechanical flexibility. Atomic force microscope measurements revealed that the optimized P123-PS blend film was uniform, crack-free, and highly resistant to moisture absorption on polyimide (PI) substrate. The film was well-adhered to the flexible Au/Cr/PI substrate for device application as a stable insulator, which was likely due to the strong molecular assembly that includes both hydrophilic and hydrophobic effects from the high molecular weights. The contact angle measurements for the P123-PS surface indicated that the system had a good hydrophobic surface with a total surface free energy of approximately 19.6 mJ m(-2). The dielectric properties of P123-PS were characterized in a cross-linked metal-insulator-metal structured device on the PI substrate by leakage current, capacitance, and dielectric constant measurements. The P123-PS film showed an average low leakage current density value of approximately 10(-10) A cm(-2) at 5-10 MV cm(-1) and large capacitance of 88.2 nF cm(-2) at 1 MHz, and the calculated dielectric constant was 2.7. In addition, we demonstrated an organic thin-film transistor (OTFT) device on a flexible PI substrate using the P123-PS as the gate dielectric layer and pentacene as the channel layer. The OTFT showed good saturation mobility (0.16 cm(2) V(-1) s(-1)) and an on-to-off current ratio of 5 × 10(5). The OTFT should operate under bending conditions; therefore flexibility tests for two types of bending modes (tensile and compressive) were also performed successfully.
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Affiliation(s)
- Jagan Singh Meena
- Department of Materials Science and Engineering, and ‡Department of Applied Chemistry, National Chiao Tung University , Hsinchu, Taiwan
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Lin CJ, Hung SC, Guo WY, Chang FC, Luo CB, Beilner J, Kowarschik M, Chu WF, Chang CY. Monitoring peri-therapeutic cerebral circulation time: a feasibility study using color-coded quantitative DSA in patients with steno-occlusive arterial disease. AJNR Am J Neuroradiol 2012; 33:1685-90. [PMID: 22499839 DOI: 10.3174/ajnr.a3049] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Intracranial hemodynamics are important for management of SOAD. This study aimed to monitor peri-stent placement intracranial CirT of patients with SOAD. MATERIALS AND METHODS Twenty-five patients received stent placement for extracranial ICA stenosis, and 34 patients with normal CirT were recruited as controls. Their color-coded DSAs were used to define the Tmax of selected intravascular ROI. A total of 20 ROIs of the ICA, OphA, ACA, MCA, FV, PV, OV, SSS, SS, IJV, and MCV were selected. rTmax was defined as the Tmax at the selected region of interest minus Tmax at the cervical segment of the ICA (I1 on AP view and IA on lateral view). rTmax of the PV was defined as intracranial CirT. Intergroup and intragroup longitudinal comparisons of rTmax were performed. RESULTS rTmax values of the normal cohorts were as follows: ICA-AP, 0.12; ICA-LAT, 0.10; A1, 0.28; A2, 0.53; A3, 0.81; M1, 0.40; M2, 0.80; M3, 0.95; OphA, 0.35; FV, 4.83; PV, 5.11; OV, 5.17; SSS, 6.16; SS, 6.51; IJV, 6.81; and MCV, 3.86 seconds. Before stent placement, the rTmax values of arterial ROIs, except A3 and M3, were prolonged compared with values from control subjects (P < .05). None of the rTmax of any venous ROIs in the stenotic group was prolonged with significance. After stent placement, the rTmax of all arterial ROIs shortened significantly, except A1and M3. Poststenting rTmax was not different from the control group. CONCLUSIONS Without extra contrast medium and radiation dosages, color-coded quantitative DSA enables real-time monitoring of peri-therapeutic intracranial CirT in patients with SOAD .
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Affiliation(s)
- C J Lin
- Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan
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Chu YL, Cheng CC, Yen YC, Chang FC. A new supramolecular hole injection/transport material on conducting polymer for application in light-emitting diodes. Adv Mater 2012; 24:1894-1898. [PMID: 22415883 DOI: 10.1002/adma.201103866] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2011] [Indexed: 05/31/2023]
Abstract
A new DNA-mimetic π-conjugated polymer poly(triphenylamine-carbazole) (PTC-U) has been prepared which exhibits high thermal stability, non-corrosion, excellent hole injection and electron-blocking abilities in the solid state owing to the uracil induced physical cross-linking. In addition, a trilayer device with PTC-U as a hole injection/transport layer is approximately 1.6 times higher than that of the commercial product PEDOT:PSS-based devices.
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Affiliation(s)
- Yu-Lin Chu
- Institute of Applied Chemistry, National Chiao Tung University, Hsin Chu, 300 Taiwan
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Yen YC, Cheng CC, Wang YS, Chu YL, Lu CH, Yang W, Chang FC. Surface modification of poly(2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) by confined photo-catalytic oxidation. J Colloid Interface Sci 2012; 368:663-6. [DOI: 10.1016/j.jcis.2011.11.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 11/15/2011] [Accepted: 11/17/2011] [Indexed: 11/27/2022]
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Abstract
In this study, we used electrospinning to fabricate nucleobase-functionalized and photo-cross-linkable poly[1-(4-vinylbenzyl uracil)] (PVBU) nanofibers. PVBU of high-molecular-weight (Mn > 250 550 g/mol) possessed a high thermal stability and sufficient chain entanglement to produce uniform fibers without forming beads. These uracil-functionalized nanofibers were further photo-cross-linked through exposure to UV light at a wavelength of 254 nm. After immersing in N,N-dimethylacetamide, the pristine PVBU fibers dissolved, while the cross-linked PVBU fibers maintained their shape; thus, the cross-linked PVBU nanofibers exhibited good dimensional stability and improved solvent resistance.
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Affiliation(s)
- Yeh-Sheng Wang
- Institute of Applied Chemistry, National Chiao Tung University, Hsinchu, 300 Taiwan
| | - Chih-Chia Cheng
- Institute of Applied Chemistry, National Chiao Tung University, Hsinchu, 300 Taiwan
| | - Yun-Sheng Ye
- Institute of Applied Chemistry, National Chiao Tung University, Hsinchu, 300 Taiwan
| | - Ying-Chieh Yen
- Institute of Applied Chemistry, National Chiao Tung University, Hsinchu, 300 Taiwan
| | - Feng-Chih Chang
- Institute of Applied Chemistry, National Chiao Tung University, Hsinchu, 300 Taiwan
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Cheng CC, Lin IH, Yen YC, Chu CW, Ko FH, Wang X, Chang FC. New self-assembled supramolecular polymers formed by self-complementary sextuple hydrogen bond motifs. RSC Adv 2012. [DOI: 10.1039/c2ra21039h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Wei HY, Hsiao YS, Huang JH, Hsu CY, Chang FC, Chen P, Ho KC, Chu CW. Dual-color electrochromic films incorporating a periodic polymer nanostructure. RSC Adv 2012. [DOI: 10.1039/c2ra00005a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Cheng CC, Chu YL, Huang PH, Yen YC, Chu CW, Yang ACM, Ko FH, Chen JK, Chang FC. Bioinspired hole-conducting polymers for application in organic light-emitting diodes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32665e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cheng CC, Yen YC, Ko FH, Chu CW, Fan SK, Chang FC. A new supramolecular film formed from a silsesquioxane derivative for application in proton exchange membranes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm12929e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhu W, Lu CH, Chang FC, Kuo SW. Supramolecular ionic strength-modulating microstructures and properties of nacre-like biomimetic nanocomposites containing high loading clay. RSC Adv 2012. [DOI: 10.1039/c2ra20523h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Lu H, Wang W, Zheng Z, Sun P, Wang X, Chang FC. Pepsin-inspired polyurethanes containing a tyrosine–fumaric acid–tyrosine segment. Polym Chem 2012. [DOI: 10.1039/c2py00481j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sahu D, Tsai CH, Wei HY, Ho KC, Chang FC, Chu CW. Synthesis and applications of novel low bandgap star-burst molecules containing a triphenylamine core and dialkylated diketopyrrolopyrrole arms for organic photovoltaics. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16760c] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chen JK, Qui JQ, Fan SK, Kuo SW, Ko FH, Chu CW, Chang FC. Using colloid lithography to fabricate silicon nanopillar arrays on silicon substrates. J Colloid Interface Sci 2011; 367:40-8. [PMID: 22104277 DOI: 10.1016/j.jcis.2011.10.044] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 09/15/2011] [Accepted: 10/17/2011] [Indexed: 11/29/2022]
Abstract
In this study, we partially grafted geminal silanol groups in the protecting organic shells on the surfaces of gold nanoparticles (AuNPs) and then assembled the alkyl-AuNP-Si(OH)(4) particles onto the surfaces of silicon (Si) wafers. The density of assembled AuNPs on the Si surface was adjusted by varying the geminal silanol group content on the AuNP surface; at its optimal content, it approached the high assembly density (0.0254 particles/nm(2)) of an AuNP assembled monolayer. Using reactive-ion etching (RIE) with the templates as masks, we transferred the patterned AuNP assemblies to form large-area, size-tunable, Si nanopillar arrays, the assembly density of which was controlled by the dimensions of the AuNPs. Using this colloidal lithography (CL) process, we could generate Si nanopillars having sub-10-nm diameters and high aspect ratios. The water contact angles of the high-aspect-ratio Si nanopillars approached 150°. We used another fabrication process, involving electron beam lithography and oxygen plasma treatment, to generate hydrophilic 200-nm-resolution line patterns on a Si surface to assemble the AuNPs into 200-nm-resolution dense lines for use as an etching mask. Subsequent CL provided a patterned Si nanopillar array having a feature size of 200 nm on the Si surface. Using this approach, it was possible to pattern sub-10-nm Si nanopillar arrays having densities as high as 0.0232 nm(-2).
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Affiliation(s)
- Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan, ROC.
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Chen SC, Kuo SW, Chang FC. On modulating the self-assembly behaviors of poly(styrene-b-4-vinylpyridine)/octyl gallate blends in solution state via hydrogen bonding from different common solvents. Langmuir 2011; 27:10197-10205. [PMID: 21678992 DOI: 10.1021/la201506y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have investigated the complexation-induced phase behavior of the mixtures of poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) and octyl gallate (OG) due to hydrogen bonding in different solvents. The Fourier transform infrared spectroscopic result indicates that the hydrogen-bonding was formed between the P4VP blocks and OG in both THF and DMF, implying the P4VP blocks can bind to OG. For PS-b-P4VP/OG mixture in chloroform, the morphological transitions were induced from the unimer configuration to swollen aggregate and complex-micelles by adding OG. Interestingly, the complex-micelles can lead the formation of the honeycomb structure from chloroform solution. The PS-b-P4VP/OG mixture in THF, behaving an amphiphilic diblock copolymer in solution state, exhibited a series of morphological transitions from sphere, pearl-necklace-liked rod, worm-liked rod, vesicle, to core-shell-corona aggregates by increasing the OG content. In contrast, the PS-b-P4VP/OG mixture in DMF maintained the unimer configuration upon adding OG. Therefore, the complexation-induced morphology of the mixtures of PS-b-P4VP and OG can be mediated by adopting different common solvents to affect the self-assembly behavior.
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Affiliation(s)
- Shih-Chien Chen
- Institute of Applied Chemistry, National Chiao Tung University, Hsin Chu, 300 Taiwan
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Lu CH, Tsai CH, Chang FC, Jeong KU, Kuo SW. Self-assembly behavior and photoluminescence property of bispyrenyl-POSS nanoparticle hybrid. J Colloid Interface Sci 2011; 358:93-101. [DOI: 10.1016/j.jcis.2011.03.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 02/14/2011] [Accepted: 03/01/2011] [Indexed: 11/16/2022]
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Cheng CC, Yen YC, Chang FC. Self-supporting Polymer from a POSS Derivative. Macromol Rapid Commun 2011; 32:927-32. [DOI: 10.1002/marc.201100167] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 04/11/2011] [Indexed: 11/08/2022]
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Kuo SW, Lin CT, Chen JK, Ko FH, Chang FC, Jeong KU. Substituent-induced delocalization effects on hydrogen-bonding interaction in poly(N-phenyl methacrylamide) derivatives. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.04.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Affiliation(s)
| | - Feng-Chih Chang
- Institute of Applied Chemistry, National Chiao Tung University, 30010 Hsinchu, Taiwan
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Chen KC, Li HT, Huang SC, Chen WB, Sun KW, Chang FC. Synthesis and performance enhancement of novel polybenzoxazines with low surface free energy. POLYM INT 2011. [DOI: 10.1002/pi.3046] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Ye YS, Tseng CY, Shen WC, Wang JS, Chen KJ, Cheng MY, Rick J, Huang YJ, Chang FC, Hwang BJ. A new graphene-modified protic ionic liquid-based composite membrane for solid polymer electrolytes. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11152c] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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