Investigation of complex formation between poly(N-vinyl imidazole) and various metal ions using the molar ratio method

Pekel, Nursel; Güven, Olgun

doi:10.1007/s003960050426

Cited by 84 publications

(71 citation statements)

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“…The polymer ligand and metal ion complex formation depends on the oxidation state and ionic radii of the metal cation substitution. As Co, Ni and Mn are in the same oxidation state (2 + ), the complex formation depends on the ionic radius [18]. Here, Co and Ni have smaller ionic radii than the Mn ion and a smaller ionic radius can facilitate faster interaction with the polymer and hence the peak splitting can be related to the Mn bigger ionic radius i.e.…”

Section: Resultsmentioning

confidence: 99%

Olivine-type cathode for rechargeable batteries: Role of chelating agents

Kandhasamy

Singh

Thurgate

et al. 2012

Electrochimica Acta

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractOlivine (LiCo 1/3 Mn 1/3 Ni 1/3 PO 4 ) powders were synthesised at 550 -600 °C for 6 h in air by a sol-gel method using multiple chelating agents and used as a cathode material for rechargeable batteries. Range of chelating agents like a weak organic acid (Citric acid -CA), emulsifier (Triethanolamine -TEA) and non-ionic surfactant (Polyvinylpyrrolidone -PVP) in sol-gel wet chemical synthesis were used. The dependence of the physicochemical properties of the olivine powders such as particle size, morphology, structural bonding and crystallinity on the chelating agent was extensively investigated. Among the chelating agents used, unique cycling behavior (75 mAh/g after 25 cycles) is observed for the PVP assisted olivine. This is due to volumetric change in trapped organic layer for first few cycles. The trapped organic species in the electrode -electrolyte interface enhances the rate of lithium ion diffusion with better capacity retention. In contrast, CA and TEA showed a gradual capacity fade of 30 and 38 mAh/g respectively after multiple cycles. The combination of all the three mixed chelating agents showed an excellent electrochemical behavior of 100 mAh/g after multiple cycles and the synergistic effect of these agents are discussed.

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Section: Resultsmentioning

confidence: 99%

Olivine-type cathode for rechargeable batteries: Role of chelating agents

Kandhasamy

Singh

Thurgate

et al. 2012

Electrochimica Acta

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“…Bi-functional catalysts having both Lewis acid and base sites are commonly used for the reaction of CO 2 to produce cyclic carbonates [13,20,33]. It is believed that a cooperative mechanism is involved whereby CO 2 and epoxide are activated simultaneously by both acidic and basic sites [10,13,34].…”

Section: Comments On the Mechanismmentioning

confidence: 99%

Supported imidazole as heterogeneous catalyst for the synthesis of cyclic carbonates from epoxides and CO2

Sankar

Ajithkumar

Sankar

et al. 2015

Catalysis Communications

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“…19 Low-molecular-weight PVI (35 kDa) was synthesized by polymerization of a 33% solution of 1-vinylimidazole in ethanol in the presence of 3% (by monomer mass) of 2,2-azobis(isobutyronitrile) in ampoules at 60 uC for 16 h. Both PVI samples were precipitated into diethyl ether, purified by double precipitation from ethanol into diethyl ether and dried under vacuum. The yield of the polymers was 75-85%.…”

Section: Experimental Materialsmentioning

confidence: 99%

Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

et al. 2008

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We show, for the first time, inhibition of silicic acid condensation over a wide range of pH, especially below 9 using certain molecular mass fractions of poly(1-vinylimidazole) (PVI). This is achieved by stabilisation of molybdate-active Si species, which are crucial to condensation and growth to form silica. The structure of the resulting composites depends on the molecular mass of the PVI chains. Long-chain macromolecules can ''encapsulate'' Si species giving rise to stable soluble complexes. Short PVI chains stimulate association of silica particles and at neutral pH precipitation occurs. Protonation of imidazole units in acidic pH results in dissolution of the precipitates. We believe that the results presented herein using PVI as a model system will help elucidate the mechanisms underpinning the molecular interactions between (bio)macromolecules and inorganic materials.

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Investigation of complex formation between poly(N-vinyl imidazole) and various metal ions using the molar ratio method

Cited by 84 publications

References 0 publications

Olivine-type cathode for rechargeable batteries: Role of chelating agents

Olivine-type cathode for rechargeable batteries: Role of chelating agents

Supported imidazole as heterogeneous catalyst for the synthesis of cyclic carbonates from epoxides and CO2

Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

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