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Electrosynthesis of Conducting Polymers in Lecithin Liquid Crystal Reaction Field
Kohei Yamabe,Hiromasa Goto 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
Lecithin is a biological material that exhibits lyotropic liquid crystal form at certain concentrations in water. Specifically, lecithin forms lamellar structures like a smectic phase layers. We describe electro-oxidative preparation of polymers such as polyaniline (PANI), poly(ethylenedioxythiophene) (PEDOT), and polypyrrole (PPy) in a lecithin liquid crystal matrix. Cross-shaped images (Maltese crosses) derived from lamellar structures were observed for the resultant polymer film with a polarizing optical microscopy under crossed Nicol condition. Lecithin lamellar structure in the water was transcribed to the resultant polymers during the electropolymerization. This research demonstrates transcription of a liquid crystal aggregation form of biomaterials onto synthetic polymers through electrochemical process.
Li, Xiao-Bo,Rahman, Md. Mahbubur,Ge, Chuang-Ye,Xu, Guang-Ri,Lee, Jae-Joon The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.2
<P>A conducting polymeric film of trypan blue (TB) was deposited onto an anodized glassy carbon electrode (AGCE) surface by electropolymerization. The poly(trypan blue)-modified AGCE was used for the determination of dopamine (DA) in the presence of uric acid (UA) and ascorbic acid (AA). The PTB/AGCE exhibits good electrocatalytic behavior for the oxidation of DA in phosphate buffer solution (PBS, pH 7.0). The electrochemical oxidation signals of DA, UA, and AA are well-resolved into three distinct peaks in cyclic voltammograms (CVs) with the anodic peak potential separations (Delta E-pa) of ca. 186, 145, and 331 mV between AA-DA, DA-UA, and AA-UA, respectively. The Delta E-pa values are large enough to discriminate DA from the interference of AA and UA. A detection limit of ca. 0.36 mu M (S/N = 3) was obtained for the sensing of DA with a linear range of 1-40 mu M in PBS (pH 7.0). The sensor could successfully determine the concentrations of DA in human urine samples with the recoveries of ca. 97.6-102.6%. This approach provides a simple, easy, sensitive, and selective method for the detection of DA in the presence of AA and UA. (C) 2016 The Electrochemical Society. All rights reserved.</P>
이아랑,한원식 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.7
A carbazole-functionalized silole, 9,9′-(4,4′-(2,3,4,5-tetraphenyl-1H-silole-1,1-diyl)bis(4,1-phenylene))bis(9H-carbazole) (BPCTPS ), was prepared through the reaction of dilithium diene with tetrachlorosilane followed by a direct substitution reaction with (4-(9H-carbazol-9-yl)phenyl)lithium. Combining the carbazole donor with the silole acceptor resulted in a new type of donor–acceptor (D–A) dyad. Density function theory (DFT) calculations showed that the highest occupied molecular orbital was localized on the carbazole group whereas the lowest unoccupied molecular orbital was localized on the silole group. BPCTPS exhibited very weak emission properties in dilute solution but emitted intensely in the aggregated state, revealing that it was an aggregation-induced emission (AIE)-active species. Furthermore, addition of electron donating groups to the silole ring resulted in a slight red shift of both the absorption and emission spectra compared with those of the reference compound hexaphenylsilole ( HTS ). The electrochemical properties of BPCTPS were also studied by cyclic voltammetry (CV), which indicated that the compound formed a cross-linked film on the Pt electrode via electropolymerization.
Lee, Kyeong-Jong,Yoon, Il,Lee, Shim-Sung,Lee, Bu-Yong Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.3
The complex of iron(II) tris(3-Br-phen) (3-Br-phen; 3-bromo-1,10-phenanthroline) was prepared as a precursor of electropolymerization and the crystal structure of [Fe(3-Br-phen)3]($PF_6$)2${\cdot}$CH3CN with a distorted octahedral geometry has been investigated. The reductive electropolymerization of $>[Fe(3-Br-phen)3]^{2+}$ complex onto the surface of a glassy carbon electrode and indium tin oxide (ITO) optically transparent electrode were performed in acetonitrile at room temperature. Thin film of poly-$>[Fe(3-Br-phen)3]^{2+}$ formed was adherent, electroactive and stably deposited on a glassy carbon disk electrode. The thin metallopolymeric film formed was also confirmed by absorption spectroscopy.
Esakkimuthu Shanmugasundaram,Chandramohan Govindasamy,Muhammad Ibrar Khan,Vigneshkumar Ganesan,Vimalasruthi Narayanan,Kannan Vellaisamy,Rajaram Rajamohan,Stalin Thambusamy 한국탄소학회 2023 Carbon Letters Vol.33 No.7
Carbon nanofibers (CNFs) are promising materials for the construction of energy devices, particularly organic solar cells. In the electrospinning process, polyacrylonitrile (PAN) has been utilized to generate nanofibers, which is the simplest and most popular method of creating carbon nanofibers (CNFs) followed by carbonization. The CNFs are coated on stainless steel (SS) plates and involve an electropolymerization process. The prepared Cu, CNF, CNF–Cu, PANI, PANI–Cu, CNF–PANI, and CNF–PANI–Cu electrode materials’ electrical conductivity was evaluated using cyclic voltammetry (CV) technique in 1 M H2SO4 electrolyte solution. Compared to others, the CNF–PANI–Cu electrode has higher conductivity that range is 3.0 mA. Moreover, the PANI, CNF–PANI, and CNF–PANI–Cu are coated on FTO plates and characterized for their optical properties (absorbance, transmittance, and emission) and electrical properties (CV and Impedance) for organic solar cell application. The functional groups, and morphology-average roughness of the electrode materials found by FT–IR, XRD, XPS, SEM, and TGA exhibit a strong correlation with each other. Finally, the electrode materials that have been characterized serve to support and act as the nature of the hole transport for organic solar cells.
Studies on corrosion protection of Al2024 T6 alloy by electropolymerized polyaniline coating
V. Karpagam,S. Sathiyanarayanan,G. Venkatachari 한국물리학회 2008 Current Applied Physics Vol.8 No.1
Aqueous electropolymerized polymer coatings on aluminum alloys can replace the carcinogenic chromate coating. In this work, theon aluminum were formed by galvanostatic and potentiostatic methods from a bath of 0.5 M oxalic acid containing 0.1 M aniline. Thecorrosion protection ability of the coating was found out by Tafel polarization and EIS in 1% NaCl solution. It has been found thatpolyaniline coated aluminum alloy has exhibited higher corrosion activity due to the presence of pores in the coating. However, the cor-rosion resistant property of polyaniline coated aluminum has been found to be improved to 90% by post-treatment in cerium containingsolution at 60℃
전기중합 분자 각인기술을 활용한 전기화학 바이오센서 개발
조채환,김지홍,신재환,양효정,박종필 한국생물공학회 2021 KSBB Journal Vol.36 No.4
Biosensors have been widely studied and developed as a tool in various fields, including pharmaceutical, food safety, environmental and medical applications. Antibodybased immunosensors are considered as gold standard method, however, more advanced biosensor without need of antibody as receptor is needed. Molecularly imprinted polymers (MIPs) are synthetic receptors obtained by polymerization of functional monomers in the presence of the target molecule and can form high specific binding sites to the target molecules depending on shape, size, and functionality. One of the most synthesis of MIPs is electropolymerization that use electrochemical method. This method can easily manipulate the desired morphology and thickness of the polymer films. Various EMIPs (electropolymerized molecular imprinted polymers) based biosensors have been developed for detection of small molecule such as chemicals, drugs, and toxins. In this review, we summarize the synthetic methods and characteristics of EMIPs-based biosensor for various targets.
Chung, Taek-Dong Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.3
A highly interferent-resistive membrane, poly-5-amino-1-naphthol (poly-5A1N), underlied beneath enzymeembedded poly-1,3-phenylendiamine (poly-m-PD) network for miniturized continuous monitoring glucose sensors. The enzyme layer was prepared from a mixed solution of glucose oxidase (GOx) and m-PD monomer by simple electrolysis. The mass change of poly-5A1N was monitored by electrochemical quartz crystal microbalance (EQCM) in situ and the corresponding thickness was measured. Successive electropolymerization of poly-5A1N and poly-m-PD create a several tens nm-thick bilayer showing excellent selectivity for $H_2O_2$ and low activity loss of immobilized enzymes.
Cho, Kyung Hee,Shin, Dong Hoon,Oh, Jungkyun,An, Ji Hyun,Lee, Jun Seop,Jang, Jyongsik American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.34
<P>Hepatitis B virus (HBV) infection is a major worldwide health issue causing serious liver diseases, including liver cirrhosis and hepatocellular carcinoma. Monitoring the serum hepatitis B surface antigen (HBsAg) level is pivotal to the diagnosis of HBV infection. In this study, we describe multidimensional conductive nanofilm (MCNF)-based field-effect transistor (FET) aptasensor for HBsAg detection. The MCNF, composed of vertically oriented carboxylic polypyrrole nanowires (CPPyNW) and graphene layer, is formed using electropolymerization of pyrrole on the graphene surface and following acid treatment. The amine-functionalized HBsAg-binding aptamers are then immobilized on the CPPyNW surface through covalent bonding formation (i.e., amide group). The prepared aptasensor presents highly sensitive to HBsAg as low as 10 aM among interfering biomolecules with various deformations. Moreover, the MCNF-based aptasensor has great potential for practical application in the noninvasive real-time diagnosis because of its improved sensing ability to the human serum and artificial saliva.</P> [FIG OMISSION]</BR>