scholarly journals Dissolution Behavior of Cellulose in IL + DMSO Solvent: Effect of Alkyl Length in Imidazolium Cation on Cellulose Dissolution

2015 ◽  
Vol 2015 ◽  
pp. 1-4 ◽  
Author(s):  
Airong Xu ◽  
Lili Cao ◽  
Bingjun Wang ◽  
Junying Ma
Keyword(s):  
Solvent Effect ◽  
Dimethyl Sulfoxide ◽  
Chain Length ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Dissolution Behavior ◽  
Cellulose Dissolution ◽  
Imidazolium Cation ◽  
Cellulose Solvents ◽  
Alkyl Length

Four cellulose solvents including [C2mim][CH3COO] + DMSO, [C4mim][CH3COO] + DMSO, [C6mim][CH3COO] + DMSO, and [C8mim][CH3COO] + DMSO were prepared by adding dimethyl sulfoxide DMSO in 1-ethyl-3-methylimidazolium acetate [C2mim][CH3COO], 1-butyl-3-methylimidazolium acetate [C4mim][CH3COO], 1-hexyl-3-methylimidazolium acetate [C6mim][CH3COO], and 1-octyl-3-methylimidazolium acetate [C8mim][CH3COO], respectively. The solubilities of cellulose in these solvents were determined at 25°C. The effect of the alkyl chain length in imidazolium cation on cellulose solubility was investigated. With increasing alkyl chain length in imidazolium cation, the solubility of cellulose increases, but further increase in alkyl chain length results in decreases in cellulose.

Protic Ionic Liquids Based on the Alkyl-Imidazolium Cation: Effect of the Alkyl Chain Length on Structure and Dynamics

2019 ◽  
Vol 123 (18) ◽  
pp. 4044-4054 ◽  
Author(s):  
Iqbaal Abdurrokhman ◽  
Khalid Elamin ◽  
Olesia Danyliv ◽  
Mohammad Hasani ◽  
Jan Swenson ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Chain Length ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Protic Ionic Liquids ◽  
Imidazolium Cation ◽  
Structure And Dynamics ◽  
Cation Effect

scholarly journals Effect of Alkyl Chain Length in Anions on the Physicochemical Properties of Cellulose-Dissolving Protic Ionic Liquids

2019 ◽  
Vol 72 (2) ◽  
pp. 55 ◽  
Author(s):  
Hideki Hanabusa ◽  
Yuko Takeoka ◽  
Masahiro Rikukawa ◽  
Masahiro Yoshizawa-Fujita
Keyword(s):  
Physicochemical Properties ◽  
Chain Length ◽  
Alkyl Chain ◽  
Ionic Conductivities ◽  
Alkyl Chain Length ◽  
Cellulose Dissolution ◽  
Protic Ionic Liquids ◽  
Scanning Calorimetry ◽  
Protic Ionic Liquid ◽  
Chemical Structures

A protic ionic liquid (PIL) composed of 1,8-diazabicyclo[5.4.0]-undec-7-ene (DBU) and acetic acid can dissolve cellulose under mild conditions and catalyse its transesterification. To investigate the relationship between physicochemical properties and chemical structures, PILs composed of DBU and carboxylic acids with varying alkyl chain lengths were prepared as cellulose-dissolving solvents. The thermal behaviours of the PILs were analysed by thermogravimetry and differential scanning calorimetry, and their viscosities, ionic conductivities, and cellulose-dissolution abilities were determined. The effect of the alkyl chain length in the carboxylate ion on the physicochemical properties of the PILs was investigated. With increasing chain length, the thermal stability and ionic conductivity increased, whereas the melting point (Tm), glass-transition temperature (Tg), cellulose solubility, and viscosity decreased. The cellulose solubility increased as the difference between the pKa values of the DBU and carboxylic acid (ΔpKa) increased. In addition, the cellulose solubility increased with the increasing density of the PIL. It was revealed that PILs with a high ΔpKa value and a carboxylate ion with a short alkyl chain are suitable for cellulose dissolution.

Aggregation of sodium dodecylbenzene sulfonate: Weak molecular interactions modulated by imidazolium cation of short alkyl chain length

2020 ◽  
Vol 589 ◽  
pp. 124435 ◽  
Author(s):  
Álvaro Javier Patiño Agudelo ◽  
Guilherme Max Dias Ferreira ◽  
Gabriel Max Dias Ferreira ◽  
Yara Luiza Coelho ◽  
Eliara Acipreste Hudson ◽  
...  
Keyword(s):  
Chain Length ◽  
Molecular Interactions ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Imidazolium Cation ◽  
Dodecylbenzene Sulfonate

scholarly journals Influence of surfactant alkyl length in functionalizing sol–gel derived microporous cobalt oxide silica

RSC Advances ◽  
2014 ◽  
Vol 4 (76) ◽  
pp. 40181-40187 ◽  
Author(s):  
Gianni Olguin ◽  
Christelle Yacou ◽  
Simon Smart ◽  
João C. Diniz da Costa
Keyword(s):  
Cobalt Oxide ◽  
Chain Length ◽  
Oxidation State ◽  
Cationic Surfactants ◽  
Alkyl Chain ◽  
Sol Gel ◽  
Alkyl Chain Length ◽  
Pore Morphology ◽  
Silica Materials ◽  
Alkyl Length

The size or alkyl chain length of cationic surfactants can be used to tailor both the pore morphology and the functionality or oxidation state of cobalt in silica materials.

The effect of N-alkyl chain length on the photophysical properties of indene-1,3-dionemethylene-1,4-dihydropyridine derivatives

2016 ◽  
Vol 4 (25) ◽  
pp. 5970-5980 ◽  
Author(s):  
Yanze Liu ◽  
Yunxiang Lei ◽  
Miaochang Liu ◽  
Fei Li ◽  
Hongping Xiao ◽  
...  
Keyword(s):  
Chain Length ◽  
Alkyl Chain ◽  
Photophysical Properties ◽  
Alkyl Chain Length ◽  
Alkyl Length ◽  
Dihydropyridine Derivatives

AIEE-active indene-1,3-dionemethylene-1,4-dihydropyridine derivatives exhibit reversible alkyl-length-dependent mechanofluorochromic properties.

Effect of Alkyl Chain Length of Imidazolium Cation on the Electroreduction of CO2 to CO on Ag Electrode in Acetonitrile

2017 ◽  
Vol 70 (3) ◽  
pp. 293 ◽  
Author(s):  
Qianqian Wang ◽  
Chengzhen Chen ◽  
Juhua Zhong ◽  
Bo Zhang ◽  
Zhenmin Cheng
Keyword(s):  
Chain Length ◽  
Alkyl Group ◽  
Density Functional ◽  
Alkyl Chain ◽  
Co2 Reduction ◽  
Alkyl Chain Length ◽  
Imidazolium Cation ◽  
Preparative Scale ◽  
Faradaic Efficiency ◽  
Ag Electrode

The effect of imidazolium-based ionic liquid on the electroreduction of CO2 to CO over a Ag electrode in acetonitrile catholyte was investigated. The voltage–current profiles clearly indicate that the electroreduction of CO2 is sensitive to the alkyl chain length at the N1-position in imidazolium cation (MIM+). Density functional theory computation suggests that the onset potential of CO2 reduction is related to the association degree between MIM+ and CO2•– species. More importantly, preparative scale electrolysis shows that the selectivity and output rate for the target product CO are also significantly affected by MIM+. With the elongation of the alkyl group in MIM+ from ethyl to octyl, the Faradaic efficiency for CO remarkably increases from 87 ± 4 % to 97 ± 2 % and then remains almost unchanged. However, the curve of the current density with respect to the chain length of alkyl group shows a convex style. These results indicate the dependence of CO2 reduction efficiency on the MIM+ adsorbed on the Ag electrode surface.

scholarly journals Silver Nanoparticles Stabilized with Phosphorus-Containing Heterocyclic Surfactants: Synthesis, Physico-Chemical Properties, and Biological Activity Determination

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1883
Author(s):  
Martin Pisárčik ◽  
Miloš Lukáč ◽  
Josef Jampílek ◽  
František Bilka ◽  
Andrea Bilková ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Biological Activity ◽  
Zeta Potential ◽  
Chain Length ◽  
Alkyl Chain ◽  
Chemical Properties ◽  
Alkyl Chain Length ◽  
Microbial Pathogens ◽  
Physico Chemical ◽  
Phosphorus Containing

Phosphorus-containing heterocyclic cationic surfactants alkyldimethylphenylphospholium bromides with the alkyl chain length 14 to 18 carbon atoms were used for the stabilization of silver nanodispersions. Zeta potential of silver nanodispersions ranges from +35 to +70 mV, which indicates the formation of stable silver nanoparticles (AgNPs). Long-chain heptadecyl and octadecyl homologs of the surfactants series provided the most intensive stabilizing effect to AgNPs, resulting in high positive zeta potential values and smaller diameter of AgNPs in the range 50–60 nm. A comparison with non-heterocyclic alkyltrimethylphosphonium surfactants of the same alkyl chain length showed better stability and more positive zeta potential values for silver nanodispersions stabilized with heterocyclic phospholium surfactants. Investigations of biological activity of phospholium-capped AgNPs are represented by the studies of antimicrobial activity and cytotoxicity. While cytotoxicity results revealed an increased level of HepG2 cell growth inhibition as compared with the cytotoxicity level of silver-free surfactant solutions, no enhanced antimicrobial action of phospholium-capped AgNPs against microbial pathogens was observed. The comparison of cytotoxicity of AgNPs stabilized with various non-heterocyclic ammonium and phosphonium surfactants shows that AgNPs capped with heterocyclic alkyldimethylphenylphospholium and non-heterocyclic triphenyl-substituted phosphonium surfactants have the highest cytotoxicity among silver nanodispersions stabilized by the series of ammonium and phosphonium surfactants.

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