scholarly journals Conductivity, Viscosity, Spectroscopic Properties of Organic Sulfonic Acid solutions in Ionic Liquids

2019 ◽  
Vol 3 (4) ◽  
pp. 81 ◽  
Author(s):  
Anh T. Tran ◽  
Jay Tomlin ◽  
Phuoc H. Lam ◽  
Brittany L. Stinger ◽  
Alexandra D. Miller ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Sulfonic Acid ◽  
Spectroscopic Properties ◽  
Metal Extraction ◽  
Temperature Dependent ◽  
Ion Migration ◽  
Camphor Sulfonic Acid ◽  
Lower Solubility ◽  
High Concentrations ◽  
Acid Ionization

Sulfonic acids in ionic liquids (ILs) are used as catalysts, electrolytes, and solutions for metal extraction. The sulfonic acid ionization states and the solution acid/base properties are critical for these applications. Methane sulfonic acid (MSA) and camphor sulfonic acid (CSA) are dissolved in several IL solutions with and without bis(trifluoromethanesulfonyl)imine (HTFSI). The solutions demonstrated higher conductivities and lower viscosities. Through calorimetry and temperature-dependent conductivity analysis, we found that adding MSA to the IL solution may change both the ion migration activation energy and the number of “free” charge carriers. However, no significant acid ionization or proton transfer was observed in the IL solutions. Raman and IR spectroscopy with computational simulations suggest that the HTFSI forms dimers in the solutions with an N-H-N “bridged” structure, while MSA does not perturb this hydrogen ion solvation structure in the IL solutions. CSA has a lower solubility in the ILs and reduced the IL solution conductivity. However, in IL solutions containing 0.4 M or higher concentration of HTFSI, CSA addition increased the conductivity at low CSA concentrations and reduced it at high concentrations, which may indicate a synergistic effect.

scholarly journals Alkylsulfuric acid ionic liquids: a promising class of strongly acidic room-temperature ionic liquids

2016 ◽  
Vol 52 (25) ◽  
pp. 4640-4643 ◽  
Author(s):  
David Dupont ◽  
Evelien Renders ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquids ◽  
Metal Oxides ◽  
Sulfonic Acid ◽  
Room Temperature ◽  
Metal Extraction ◽  
Room Temperature Ionic Liquids

Alkylsulfuric acid ILs are simple to make and offer a more strongly acidic alternative to sulfonic acid ILs for applications in catalysis, metal extraction and dissolution of metal oxides.

Study on the temperature-dependent coupling among viscosity, conductivity and structural relaxation of ionic liquids

2015 ◽  
Vol 17 (29) ◽  
pp. 19126-19133 ◽  
Author(s):  
Tsuyoshi Yamaguchi ◽  
Takuya Yonezawa ◽  
Shinobu Koda
Keyword(s):  
Ionic Liquids ◽  
Structural Relaxation ◽  
Spin Echo ◽  
Neutron Spin ◽  
Temperature Dependent ◽  
Frequency Dependent ◽  
Neutron Spin Echo ◽  
Dependent Viscosity

The frequency-dependent viscosity and conductivity of three imidazolium-based ionic liquids were measured at several temperatures in the MHz region, and the results are compared with the intermediate scattering functions determined by neutron spin echo spectroscopy.

scholarly journals Kinetics of metal extraction in ionic liquids: Eu3+/HNO3//TODGA/[C1C4im][Tf2N] as a case study

RSC Advances ◽  
2013 ◽  
Vol 3 (27) ◽  
pp. 10736 ◽  
Author(s):  
Michal Sypula ◽  
Ali Ouadi ◽  
Clotilde Gaillard ◽  
Isabelle Billard
Keyword(s):  
Ionic Liquids ◽  
Metal Extraction ◽  
Kinetics Of

Effectiveness of Commercial Disinfectants for Inactivating Hepatitis A Virus on Agri-Food Surfaces

2003 ◽  
Vol 66 (1) ◽  
pp. 115-119 ◽  
Author(s):  
J. JEAN ◽  
J.-F. VACHON ◽  
O. MORONI ◽  
A. DARVEAU ◽  
I. KUKAVICA-IBRULJ ◽  
...  
Keyword(s):  
Active Ingredient ◽  
Quaternary Ammonium ◽  
High Density Polyethylene ◽  
Contact Time ◽  
Sulfonic Acid ◽  
Hepatitis A ◽  
Incubation Temperature ◽  
Hepatitis A Virus ◽  
Dodecylbenzene Sulfonic Acid ◽  
High Concentrations

Six commercial disinfectants were tested for their efficacy in inactivating hepatitis A virus in solution or attached to agri-food surfaces. Disinfectant I contains 10% quaternary ammonium plus 5% glutaraldehyde;disinfectant II contains 12% sodium hypochlorite; disinfectant III contains 2.9% dodecylbenzene sulfonic acid plus 16% phosphoric acid; disinfectant IV contains 10% quaternary ammonium; disinfectant V contains 2% iodide; and disinfectant VI contains 2% stabilized chlorine dioxide. Among these, disinfectants I and II were shown to be the most effective in inactivating hepatitis A virus in solution. The efficacy of these disinfectants was further tested against hepatitis A virus attached to common agri-food surfaces, including polyvinyl chlorine, high-density polyethylene, aluminum, stainless steel, and copper. Disinfectant II was shown to be the most effective, with a maximum inactivation level of about 3 log10. The inactivation efficacy was shown to be affected by the concentration of the active ingredient, the contact time between the disinfectant and the contaminated surfaces, and the incubation temperature. In general, hepatitis A virus was shown to be highly resistant to most disinfectants tested, and high concentrations of active ingredient were needed to achieve acceptable inactivation levels.

Transitions in Dictyostelium discoideum behaviour: influence of calcium and fluoride on slug phototaxis and thermotaxis

1984 ◽  
Vol 65 (1) ◽  
pp. 111-121
Author(s):  
U. Dohrmann ◽  
P.R. Fisher ◽  
M. Bruderlein ◽  
K.L. Williams
Keyword(s):  
Dictyostelium Discoideum ◽  
Temperature Gradients ◽  
Sensory Transduction ◽  
Inorganic Salts ◽  
Transition Temperatures ◽  
Temperature Dependent ◽  
High Concentrations

Phototaxis and thermotaxis by slugs of Dictyostelium discoideum show transitions that result in bimodality in phototaxis and temperature-dependent orientation up or down temperature gradients. New steps in the sensory transduction chain for these kinds of behaviour are elucidated from studies using inorganic salts (Ca2+, EGTA, KF) and several mutants. KF enhances bimodality of phototaxis, improves the accuracy of thermotaxis, and affects the transition temperatures from positive to negative thermotaxis. Changing the Ca2+ concentration has effects on both phototaxis and thermotaxis. At low Ca2+ concentrations phototaxis and thermotaxis are enhanced. In the presence of EGTA or high concentrations of Ca2+ phototaxis becomes bimodal, thermotaxis is impaired and spontaneous turning is suppressed. These results obtained by changing Ca2+ concentrations are analogous to those obtained previously with sensory transduction mutations, which coordinately affect phototaxis and thermotaxis.

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