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报道了2个取代三联吡啶配体(4′-苯基-2,2′:6′,2″-三联吡啶(L1)和4′-二茂铁基-2,2′:6′,2″-三联吡啶(L2)的Co(Ⅱ)配合物(Co(Ⅱ)(L1)2)(ClO4)2.4CH3CN(1)和(Co(Ⅱ)(L2)2)(ClO4)2H2O(2)的合成及配体L2的配合物1和配合物2的晶体结构,电化学研究表明:在配合物2中,由于Co^2+的作用,二茂铁基的氧化电位较配体L2中的二茂铁 相似文献
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四元体系CsCl—PrCl3—13%HCl—H2O(25℃)和CsCl—PrCl3—42%H… 总被引:1,自引:0,他引:1
测定了四元体系CsCl-PrCl3-13%HCl-H2O(25℃)和CsCl-PrCl3-42%HAc-H2O(30℃)的稳定平衡态的溶液数据,绘制了相应的溶度图,两个体系的皆中有4种固相,CsCl,PrCl3.6H2O2种原始盐和CsCl.PrCl3.6H2O,3CsCl.PrCl3.7H2O2种复盐,证实了文献中对Meyer反应1机理的解释,并对新相进行了热分析,X射线粉末衍射及偏光显微镜测定 相似文献
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聚苯胺薄膜电极上循环伏安法可逆波理论和验证 总被引:5,自引:1,他引:5
提出了聚苯胺薄膜电极上循环伏安法可逆波方程式,对伏安曲线的性质进行了详细的讨论。聚苯胺薄膜电极是利用浓度为1.09mol/L苯胺溶液(内含2.0mol/L HCl)在铂电极上用恒电流(0.01-0.1mA/cm^2)使苯胺发生氧化反应进而经聚合获得。结果表明,该法得到的聚苯胺膜具有良好的均匀度和单一性。在10mol/L HCl底液中获得的循环伏安曲线与理论结果相符合。 相似文献
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硼掺杂多晶金刚石薄膜电极的电化学特性 总被引:1,自引:0,他引:1
用循环伏安法和恒电位法研究了硼掺杂多晶金刚石薄膜电极(DFE)的若干电化学特性。电极面积4×4mm^2。在0.1mol/L KCl,NaNO3,NaOH和KH2PO4+Na2HPO4(pH=6.86)电解质溶液中电势窗口均为-500 ̄+800mV;而在0.1mol/L HCl和H2SO4溶液中电势窗口为-200 ̄+1100mV.K3Fe(CN)6的氧化峰电位为+500mV,与Pt电极测量相同;校正 相似文献
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由TiCl4/HCl配制的含钛柱化剂与粘土进行阳离子交换后得到大孔钛层柱粘土(Ti-PILC),详细研究了各种合成条件,诸如Ti(Ⅳ)及HCl浓度,柱化剂老化时间,粘土初始浓度,交换温度及配料比等对层柱粘土的大孔及比表面积的影响.优化条件合成的Ti-PILC存在两种晶面间距(d001),其中之一(2.56nm)对应大孔结构.Ti-PILC比表面积为328m2/g,500℃焙烧后d001保持2.32nm,650℃焙烧后比表面积仍达301.4m2/g.Ti-PILC的大孔结构主要取决于交换时混合液中Ti(Ⅳ)和HCl浓度,并与柱化剂老化时间、交换温度等因素有关;与原柱化剂中Ti(Ⅳ)和HCl浓度无关.混合液中CHCl提高,Ti-PILC的比表面积下降;当CHCl增至70mmol/L时,产物中大晶面间距消失,仅留下小晶面间距(~1.4nm).随着混合液中CTiCl4的提高,Ti-PILC的比表面积先上升而后下降。当CTiCl4增至146mmol/L时,产物也仅有小晶面间距(1.4nm). 相似文献
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TBP碳糊修饰电极三元络合物体系测定痕量铅(Ⅱ) 总被引:5,自引:0,他引:5
研制了磷酸三丁酯(TBP)碳糊修饰电极,在含1-苯基-3-甲基-4-苯甲酰基-5-吡唑酮(PMBP)的HCl-KCl底液中,通过电位富集,将三元络合物Pb(PMBP)2(TBP)2中的铅富集在电极上,用2.5次微分阳极溶出伏安法测定铅.铅浓度在1.0×10-9~2.5×10-7mol·L-1范围内与峰高呈良好的线性关系.该电极用于铜合金和废水中铅的测定,获得满意结果. 相似文献
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单宁的电化学氧化及伏安测定法 总被引:8,自引:0,他引:8
以玻碳电极(GCE)为工作电极,KH2PO4-Na2HPO4为支持电解质,通过循环伏安法首次观测到了单宁的不可逆氧化峰。在单宁浓度为1.0×10~(-7)~1.2 × 10~(-5)mol/L范围内与其峰电流呈线性关系;检出限为 1.3×10~(-8)mol/L。在中药五倍子浸提液中用标准加入法进行回收实验,其平均回收率为100.6%。该法简便、快速,用1.0×10~(-6)mol/L的单宁溶液重复测定11次,RSD为2.l%。对其反应机理作了初步探讨。 相似文献
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研究了四元体系CsCl-LaCl3-HCl-H2O(25℃、「HCl」=13%(wt),23%(wt)和CsCl-LaCl3-HAc-H2O(30℃,「HAc」=42%(wt))的平衡态的溶度数据,并给出制了相应的溶度图,共得到了CsCl.LaCl3.4H2O、2CsCl.LaCl3.2H2O和3CsCl.LaCl3.3H2O3种化合物。对得到的新相进行了热分析,X射线粉末衍射及偏光性质的测定,依 相似文献
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Baciocchi E Bietti M Di Fusco M Lanzalunga O 《The Journal of organic chemistry》2007,72(23):8748-8754
A kinetic study of the one-electron oxidation of a series of ferrocenes (FcX: X = H, CO2Et, CONH2, CH2CN, CH2OH, Et, and Me2) by PINO generated in CH3CN by reaction of N-hydroxyphthalimide (NHPI) with the cumyloxyl radical produced by 355 nm laser flash photolysis of dicumyl peroxide has been carried out. Ferrocenium cations were formed, and the reaction rate was determined by following the decay of PINO radical at 380 nm as a function of the FcX concentration. Rate constants were very sensitive to the oxidation potential of the substrates and exhibited a good fit with the Marcus equation, from which a lambda value of 38.3 kcal mol(-1) was calculated for the reorganization energy required in the PINO/ferrocenes electron-transfer process. Knowing the ferrocene/ferrocenium self-exchange reorganization energy it was possible to calculate a value of 49.1 kcal mol(-1) for the PINO/PINO- self-exchange reaction in CH3CN. Moreover, from the Marcus cross relation and the self-exchange rates of ferrocene and dimethylferrocene, the intrinsic reactivity of PINO in electron-transfer reactions has been calculated as 7.6 x 10(2) M(-1) s(-1). The implications of these values and the comparison with the electron-transfer self-exchange reorganization energies of peroxyl radicals are briefly discussed. 相似文献
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A.I. Ranka M.S. El-Aasser J.W. Vanderhoff 《Journal of Dispersion Science and Technology》2013,34(3-4):403-420
The level of colloidal stability of a latex coating formulation is governed by the hydrodynamic size of the pigment particle and its aggregates, along with the electrolyte concentration of the coating formulation. Model latex coating films were developed to investigate the effects of pigment aggregate size and the electrolyte concentration in the latex coating formulation on the critical pigment volume concentration (CPVC), as determined by mechanical optical and permeability properties. The poly(styrene) pigment and poly(styrene-butadiene) (60:40) binder particles were characterized for their relative sizes, the surfactant surface coverage and the critical coagulation concentration, in dilute (1.8% solids) and concentrated (42% solids) dispersions, for sodium chloride and calcium chloride. The hydrodynamic diameter of the strong pigment aggregates formed as a function of aging time, after adjusting the electrolyte concentration of the pigment dispersion to the c.c.c. level were characterized by capillary chromatography technique. The Increasing size of the pigment aggregates and the increasing electrolyte concentration of the latex coating formulation were shown to sharply decrease the CPVC values determined by mechanical and optical properties such as tensile strength and contrast ratio of the coating. Their influence on the permeability property of the films such as porosity was limited by the availability of the binder to form smooth surface below 35-40% PVC. The morphological studies of the coating films showed that aggregates cause an increase in the degree of non-uniform distribution of the binder and pigment in the latex coating film 相似文献
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H. D. Mendoza H. Sasaki I. Matsuoka T. Sugimoto 《Journal of Dispersion Science and Technology》2013,34(7):767-791
The detachment of fine particles of silica (0.12 μm) and hematite (0.10 μm) coattached on glass beads (80 μm) in aqueous solution were studied as a function of pH and electrolyte concentration. Detachment occurs at alkaline conditions wherein the surface potentials of the particles and collector are negative. The selective separation of silica particles being governed by the balance of short range forces, which are affected by increasing the pH and electrolyte concentration. 相似文献
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一种新型聚合物固体电解质的导电性的研究 总被引:3,自引:0,他引:3
自从1975年Wright等[1]首次发现了PEO 碱金属盐络合物的离子导电性后,人们对不同类型的聚合物固体电解质进行了深入的研究,其中最成功的是玻璃化温度Tg较低、盐浓度适中的“salt in polymer”固体电解质[2,3],但在没有其它小分... 相似文献
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聚电解质复合物溶解性研究 总被引:2,自引:0,他引:2
报道了聚电解质复合物的一种新的溶剂体系———离子表面活性剂剂的水溶液 ,研究了表面活性的用量及结构、温度、外加小分子电解质对复合物溶解性的影响 ,初步探讨了溶解机理 ,通过扫描电镜观察了复合物溶解后在溶液中的形态 .研究表明 ,当复合物与离子表面活性剂定量结合到一定程度时 ,就会使复合物发生溶解 .表面活性剂碳链长度的增加、温度的提高均会对复合物的溶解有不同程度的促进 .加入少量的无机电解质如氯化钠 ,会促进复合物的溶解 ,若氯化钠加入量过多 ,反而不利于复合物的溶解 .复合物的溶解机理被认为是表面活性剂的解离作用和疏水作用二者的协同 . 相似文献
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四氢呋喃/三氟化硼乙醚混合电解质中咔唑的电化学聚合 总被引:2,自引:0,他引:2
在四氢呋喃/三氟化硼乙醚混合电解质中直接阳极氧化咔唑制备聚咔唑.单体的起始氧化电位为0.92 Vversus SCE,远低于单体在含0.1 mol.L-1Bu4NBF4的乙腈溶液中的起始氧化电位(1.36 Vversus SCE).在此体系中获得的聚咔唑膜具有良好的电化学活性和稳定性,其电导率为7.0×10-3S.cm-1.聚合物可部分溶解于二甲基亚砜等强极性有机溶剂.UV-Vis,FT-IR,1H-NMR证明聚合物共轭长链的形成.该体系中获得的聚咔唑是一种蓝光发射材料,并具有良好的热稳定性. 相似文献
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用电纺的方法制备了聚偏氟乙烯纳米纤维膜,它们具有多微孔结构,能够作为锂电池聚合物电解质.电纺中聚合物溶液的浓度对制备的电纺膜的结构形态有很大的影响,低浓度(10 wt%)时得到珠丝结构的膜,浓度15 wt%时则为纤维结构,而高浓度(18 wt%)时,电纺膜为交联的网状结构.用电纺法制备的聚偏氟乙烯纳米纤维微孔膜具有较高的孔隙率,而且它们与锂金属电极具有良好的界面稳定性;在25℃时吸液率最高可达340%,以这种膜制备的聚合物电解质室温电导率可达到1.57×10-3S.cm-1;由该电解质组装的扣式电池以0.5 mA.cm-2恒流充放电,25℃时50次循环后几乎无容量损失,具有良好的循环性能;即使60℃时,电池仍能保持良好的工作稳定性. 相似文献
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以对氨基苯磺酸、苯酚、甲醛为基本原料,设计并合成了内盐结构稳定、对 (NH4)2SO4有较大亲合力的新型两性吸附树脂-PSN树脂,研究了PSN树脂对 (NH4)2SO4的吸附性质,同时研究了PSN树脂对 (NH4)2SO4的吸附等温线的静态性能。实验结果表明,PSN树脂对 (NH4)2SO4的吸附是以分子吸附形式进行,常温下PSN树脂对与自身结构相似的 (NH4)2SO4饱和吸附量可达3.16mmol/g干树脂,吸附等温线符合Langmuir等温方程。 相似文献