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以乙烯基二茂铁、丙烯酰胺和甲基丙烯酸二甲氨基乙酯为共聚单体,采用自由基聚合法合成了具有水溶性和氧化还原活性的聚合物,并通过示差扫描量热法、傅里叶红外光谱、紫外-可见吸收光谱,及电化学方法对其玻璃化转变温度、化学组成、质子化作用及电化学性能进行了分析。实验结果表明该共聚物为乙烯基二茂铁、丙烯酰胺和甲基丙烯酸二甲氨基乙酯三元共聚物。该共聚物具有较好的水溶性和柔性,这些特点有利于提高修饰电极电子转移的效率,以及实现酶活性中心与电极之间的直接电子转移。共聚物中的甲基丙烯酸二甲氨基乙酯结构单元在近中性的溶液中可发生质子化作用,可与酶之间形成离子键从而有利于缩短酶活性中心与电极表面之间导电路径。共聚物的电化学性能表现出良好的氧化还原可逆性,且实现了共聚物与电极之间的可逆电子转移。另外该共聚物在溶液中的扩散系数较低,有利于提高修饰电极的稳定性。 相似文献
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金属有机聚合物的拓扑结构是影响其光电性质的重要原因之一。通过吡啶配体不同位点引入的电化学活性基团乙烯基或乙炔基,在电极表面电化学聚合制备了拓扑结构不同的钌金属有机聚合物薄膜,并利用循环伏安、紫外-可见吸收光谱、红外反射光谱、扫描电子显微镜等手段对其电化学特性、光电性质、表面形貌等性质进行了表征。结果表明,电活性配合物反应活性位点的空间位阻效应影响了电化学聚合的效率,其不同拓扑结构的聚合产物具有明显的光谱电化学性质差异。 相似文献
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合成含二茂铁核高分子是近年来元素有机高分子领域中受到人们注意的和感到兴趣的课题。自1955年以来,Arimoto首先报导了乙烯基二茂铁的合成和它的聚合;其后有人报导主链中合二茂铁核的高分子,并研究它们异常的磁性;还有人报导过将二茂铁核引入硅有机高分手中得到具有耐高温和耐辐射的液体材料。虽然有关这方面工作的文献为数不多,它的实际用途尚未能肯定,但把二茂铁的特殊結构引进高分子中,估計有可能得到具有优越性能的高分子材料。 为此,我们合成了一些合烯基二茂铁的单体,通过聚合得到侧链合二茂铁核的高分子化合物,并作了一些基本性能的初步测定,本文拟着重报导这些单体的合成以及它们初步 相似文献
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二茂铁-Nafion修饰葡萄糖传感器的研究 总被引:1,自引:0,他引:1
1 引言 第二代电流式酶传感器采用非生理的氧化还原介体如二茂铁及其衍生物、铁氰化钾、四硫富瓦烯、醌及其衍生物、钉化合物及麦尔多蓝等代替氧,起着酶与电极之间的电子传递作用,克服了第一代电流式酶传感器背景电流大,响应特性差,易受环境中氧浓度的影响,干扰大等缺点。但目前第二代电流式酶电极还存在着介体流失,电极污染及一些电活性物质干扰等问题。商品化的Nafion甲醇溶液不易溶解酶且能使部分酶失活,本文把Nafion甲醇溶液制成Nafion水溶液,将葡萄糖氧化酶溶解在Nafion水溶液,然后把它修饰在修饰有二茂铁的玻碳电极的表面,最后再修饰一层Nafion膜,成功地制备了二茂铁-Nafion修饰葡萄糖传感器,Nafion膜不仅能把抗坏血酸、尿酸等电活性物质阻挡在电极外,防止其干扰,同时具有防污性能,而且能防止二茂铁的流失,提高电极的稳定性。该传感器具有抗干扰能力强,响应快等特点。 相似文献
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混合金属氧化物阳极在海水中的电化学性能 总被引:1,自引:0,他引:1
采用热分解方法制备钛基混合金属氧化物阳极 ,用扫描电镜对阳极涂层显微形貌进行了分析 ,并通过实海模拟试验考察了混合金属氧化物阳极在海水阴极保护系统中的使用性能 .SEM分析结果表明 ,混合金属氧化物阳极涂层呈多孔多裂纹的显微结构 ,与其它阳极材料相比 ,此种阳极具有更大的活性表面积 .电化学试验结果表明 ,混合金属氧化物阳极在海水中具有良好的电化学稳定性和电化学活性 ;此外 ,混合金属氧化物阳极在海水中的消耗率很低 ,属于不溶性的阳极材料 ,作为外加电流阴极保护的辅助阳极具有广泛的应用前景 相似文献
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硝基苯的电还原特性研究 总被引:14,自引:0,他引:14
采用准稳态极化、循环伏安、线性扫描和恒电位阶跃等测试方法,对H2SO4溶液中硝基苯的电还原特性进行研究,评价了硝基苯在Cu、Cu-Hg和Cu-Ni电极的电还原反应活性,研究了硝基苯电还原为PAP的中间步骤,并对反应机理进行了探讨。结果表明,硝基苯在酸性介质中的电还原反应存在中间步骤,并伴有反应物吸附现象,硝基苯电还原反应受硝基苯及其还原产物在溶液中的液相传质步骤控制. 相似文献
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本文采用电化学还原石墨烯(ECGO)/Nafion修饰玻碳电极对核黄素的循环伏安特性进行了研究。结果显示,ECGO/Nafion修饰薄膜对核黄素显示出良好的催化效果。实验考察了氧化石墨烯(GO)/Nafion的用量、扫描圈数、pH值、电位等对核黄素电化学行为的影响。在最优条件下,采用差分脉冲伏安法测定了核黄素检测的线性范围,结果显示,氧化峰电流与核黄素的浓度在7.5×10~(-8)~1.0×10~(-5) mol·L~(-1)范围内呈现良好的线性关系,检测限可达2.5×10~(-8) mol·L~(-1)。用该方法测定实际样品中的核黄素含量,效果较好。 相似文献
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Alberto Escarpa María Cristina González Antonio Javier Blasco Maria del Carmen Rogerio Miriam Hervás 《Electroanalysis》2007,19(9):952-957
The accuracy of a novel electroanalytical route to determine total isoflavones using a secondary standard from Drug Master File (SW/1211/03) as metrological reference with well‐known traceability and its applicability using representative soy samples is demonstrated. Calibration protocols were used i) for choosing a suitable isoflavone standard to determine the total isoflavone content, ii) to evaluate matrix effects and, iii) to evaluate the overall reliability and performance of the method in analytical operations, extraction and analysis. The inherent electroactivity of both, aglycones and glycoside structures and the similar analytical sensitivity exhibited by the prominent soy isoflavones was relevant to determine the total amount with reliability in terms of accuracy (E<10%) and precision (RSDs<7%) in soy samples. In consequence, the introduction of the term isoflavonoid index as the total amount of isoflavones obtained when they are amperometrically monitorized at +1.0 V as a particular case of the electrochemical index concept is proposed. 相似文献
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《Arabian Journal of Chemistry》2020,13(2):4350-4357
Acetaminophen (AC) is one of the most commonly prescribed analgesic and antipyretic drug, which is considered to be safe as well as effective. Rational use of AC does not pose any toxicity or adverse effects, however, an overdose or prolonged use could lead to nephrotoxicity and severe hepatoxicity. Thus, monitoring of AC is essential for drug safety. In this work, a facile Fe2O3/reduced graphene oxide (Fe2O3/RGO) nanocomposite was synthesized for improved electrochemical detection of AC. The material was synthesized through a simple one-step process. For characterization of synthesized Fe2O3/RGO composite, energy-dispersive X-ray spectroscopy (EDX), field emission-scanning electron microscopy (FE-SEM) and electrochemical impedance spectroscopy (EIS) were employed. To verify the electrochemical performance of Fe2O3/RGO nanocomposite, GCE was modified with this nanocomposite and utilized for quantification of AC. The detection limit of AC was 21 nM in a linear range from 1.0 × 10−7 to 74 × 10−6 M. Furthermore, the sensor also unveiled good stability, promising sensitivity and selectivity. Hence, Fe2O3/RGO could be applied as a sensing material for electrochemical detection of AC. Finally, the analytical utility of the method was also verified in human urine and drug samples with some preliminary treatments. 相似文献
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普鲁士蓝膜修饰电极的电化学阻抗谱 总被引:6,自引:0,他引:6
测量了应用电化学方法制备的不同厚度的普鲁士蓝膜修饰电极的循环伏安行为与电化学阻抗谱.由所得到的循环伏安图讨论了普鲁士蓝修饰膜的氧化还原过程,并对相关的Nyquist图进行了解析,提出了相应的等效电路.在此基础上计算出较薄膜中普鲁士蓝/普鲁士白电化学反应的表观速率常数和表观扩散系数,讨论了膜厚度对电荷扩散的影响.当膜相对较薄时,电极过程主要由动力学过程控制;当膜达到一定厚度时,电荷在膜中的扩散速率受到限制,电极过程由动力学过程和电荷扩散过程共同控制,证实了文献报导的普鲁士蓝膜修饰电极为多层空间分布电荷传递模型. 相似文献
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结合实际发展电化学科学─—武汉大学电化学研究室工作简介 总被引:1,自引:1,他引:0
结合实际发展电化学科学─—武汉大学电化学研究室工作简介查全性,陆君涛(武汉大学化学系电化学研究室,武汉430072)在物理化学的众多分支学科中,电化学长期保持良好的发展势头。除了电化学所研究的体系(溶液、电极/溶液界面等)具有广泛的基础意义外,促使电... 相似文献
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活性炭二次活化对其电化学容量的影响 总被引:3,自引:0,他引:3
为进一步提高作为电化学超级电容器电极材料活性炭的电化学容量, 采用KOH作为二次活性剂, 将所得活性炭进行二次化学活化处理, 从而得到二次活化活性炭. 将原始活性炭材料与二次活化活性炭材料都分别经过系列处理, 组装成电化学超级电容器进行电化学性能测试. 测试结果表明, 二次活化活性炭材料的电化学容量达到145.0 F·g-1(有机电解液), 远远大于原活性炭材料的容量(45.0 F·g-1). 为研究二次活化活性炭材料电化学容量大幅提高的原因, 将这两种材料分别进行微观结构数据测试, 包括比表面积、N2吸脱附等温曲线和孔径分布. 研究结果表明, 二次活化处理大大增加了二次活化活性炭材料在孔径为2-3 nm的中孔分布, 从而证实对于有机电解液, 电极材料在2-3 nm的中孔对其电化学容量的提高具有重要意义. 相似文献
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《Electroanalysis》2003,15(7):629-634
Electrochemical CV and SWV studies were performed with double stranded DNA from salmon testes (dsDNA) and single stranded DNAs, containing 25 nucleotides (ssDNA) directly adsorbed at polycrystalline Au electrodes. A distinct oxidation peak at +730 mV (SWV, scan rate 0.248 V s?1) or at +730 – +780 mV (CV, scan rate from 0.3 to 1 V s?1) was obtained with DNA‐modified Au electrodes after a time‐dependent prepolarization step at a positive potential value, i.e., at +500 mV (vs. Ag|AgCl), performed with the DNA‐modified Au electrodes dipped in a blank buffer solution. No electrochemical activity was detected when ssDNA, containing no guanines, was used for adsorptive modification of the Au electrodes. Electrochemical impedance measurements registered a possible reorganization of the adsorbed DNA layer in the course of the prepolarization, accompanied by decreasing in‐phase impedance. The results enable us to relate the oxidation process observed at the DNA‐modified Au electrodes with the oxidation of guanine residues in DNA. 相似文献
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de-los-Santos-Alvarez P Lobo-Castañón MJ Miranda-Ordieres AJ Tuñón-Blanco P 《Analytical and bioanalytical chemistry》2004,378(1):104-118
A review of current strategies aimed at detecting nucleic acids (NA) using NA-modified solid electrodes reveals the versatility and potential of electrochemical detection in this field. What emerged at the beginning of 90s as a very promising detection system in DNA technology is now resulting in the first commercial devices. Many aspects of the experimental design, for example surface immobilisation and detection schemes, are outlined and evaluated. Although most approaches use hybridisation as the recognition reaction, those not based on hybridisation are also included. As is finally shown, great advances have been achieved, although further developments are required if electrochemical devices are to be suitable for routine measurement.Abbreviations A
Adenine
- a.c.V
Alternating current voltammetry
- Amp.
Amperometry
- Apo E
Apolipoprotein E
- BCB
Brilliant cresyl blue
- BLM
Bilayer lipid membrane
- bp
Base pairs
- BPPG
Basal planar pyrolytic graphite
- bpy
2,2-Bipyridine
- C
Cytosine
- CMV
Citomegalovirus
- CPE
Carbon paste electrode
- CPSA
Constant-current chronopotentiometric stripping analysis
- Cronoamp.
Chronoamperometry
- CSPE
Carbon screen-printed electrode
- CV
Cyclic voltammetry
- dmb
4,4-Dimethyl-2,2-bipyridine
- dmphen
Dimethylphenanthroline
- DPPZ
Dipyrido[3,2-a.2,3-c]phenazine
- DPV
Differential pulse voltammetry
- dsDNA
Double-stranded DNA
- EtBr
Ethidium bromide
- Fc
Ferrocene
- Fc-CA
Ferrocenecarboxaldehyde
- Fc-CTPPZ
Di[1-ferrocenecarbamoylpropyl)tetrahydropyrazine-4-(propylcarbamoylpyridine)]phenazine
- Fc-NH2
Aminoferrocene
- FET
Field-effect transistor
- G
Guanine
- GCE
Glassy carbon electrode
- HBV
Hepatitis B virus
- HGH1
Human growth hormone 1
- HIV
Human immunodeficiency virus
- HRP
Horseradish peroxidase
- HOPGE
Highly oriented pyrolytic graphite electrode
- IPA
Intermittent pulse amperometry
- ISFET
Ion-selective field-effect transistor
- ITO
Tin-doped indium oxide electrode
- LSV
Linear sweep voltammetry
- Nano-Au
Au nanoparticles
- NMP
Nucleotide monophosphate
- ODN
Oligodeoxynucleotide
- ox.
Oxidation
- PCR
Polymerase chain reaction
- PET
Poly(ethylene terephthalate)
- PGE
Pyrolytic graphite electrode
- phen
1,10-Phenanthroline
- PNA
Peptide nucleic acid
- Ppy
Polypyrrole
- (PQQ)GDH
Pyrroline quinone glucose dehydrogenase
- red.
Reduction
- SAM
Self-assembled monolayer
- SBP
Soybean peroxidase
- SNP
Single nucleotide polymorphism
- ssDNA
Single-stranded DNA
- SWV
Square-wave voltammetry
- T
Thymine
- Th
Thionine
- TTV
TT virus
- Ep
Difference of peak potential 相似文献