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PubMed Journals Articles About "Diffusional Dynamics Tetraalkylphosphonium Ionic Liquid Films Measured Fluorescence" RSS

18:08 EDT 24th June 2019 | BioPortfolio

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Showing "Diffusional Dynamics Tetraalkylphosphonium Ionic Liquid Films Measured Fluorescence" PubMed Articles 1–25 of 17,000+

Diffusional Dynamics of Tetraalkylphosphonium Ionic Liquid Films Measured by Fluorescence Correlation Spectroscopy.

Fluorescence correlation spectroscopy (FCS) is applied to investigate the diffusional dynamics of hydrophilic (Atto 590) and amphiphilic (DiD) fluorophores in a series of alkylphosphonium ionic liquid (IL) films ([P4448][Cl], [P6668][Cl], [P66614][Cl], and [P66614][NTf2]) in order to determine diffusional parameters and to elucidate nanoscale structural heterogeneities within the IL. From the measured correlation functions, the diffusion coefficients of the fluorescent molecules are estimated, rendering val...


Thermal-induced slippage of soft solid films.

The dynamics of interfacial slippage of entangled polystyrene (PS) films on an adsorbed layer of polydimethylsiloxane on silicon was studied from the surface capillary dynamics of the films. By using PS with different molecular weights, we observed slippage of the films in the viscoelastic liquid and rubbery solid state, respectively. Remarkably, all our data can be explained by the linear equation, J=-M∇P and a single friction coefficient, ξ, where J is the unit-width current, M is mobility, and P is La...

Electrowetting of ionic liquid on graphite: In situ electrochemical X-ray photoelectron spectroscopy probing.

Thin films of ionic liquid 1-ethyl-3-methylimidazolium bis(fluoromethylsulfonyl) imide ([EMIm][FSI]) vapor-deposited on HOPG were studied by XPS and AFM. The results revealed a reversible morphological transition from the "drop-on-layer" structure to a "flat-layer" structure at positive, and not at negative polarization. The effect is rationalized in terms of electric field induced reduction of the liquid-solid transition temperature in the ionic liquid film, when its thickness is comparable with the charge...


Understanding the charging dynamics of an ionic liquid electric double layer capacitor via molecular dynamics simulations.

We investigate the charging phenomena of an electric double layer capacitor (EDLC) by conducting both equilibrium and non-equilibrium molecular dynamics (MD) simulations. A graphene electrode and 1-ethyl-3-methylimidazolium thiocyanate ([EMIM]+[SCN]-) ionic liquid were used as a system for the EDLC. We clarify the ionic layer structure and show that an abrupt change of the ionic layers leads to a high differential capacitance of the EDLC. The charging simulations reveal that the charging dynamics of the EDL...

Solvent welding and imprinting cellulose nanofiber films using ionic liquids.

Cellulose nanofiber films (CNFF), were treated via a welding process using ionic liquids (ILs). Acid-base conjugated ILs derived from 1,5-diazabicyclo[4.3.0]non-5-ene [DBN] and 1-ethyl-3-methylimidazolium acetate ([emim][OAc]) were utilized. The removal efficiency of ILs from welded CNFF was assessed using liquid-state nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared spectroscopy (FTIR). The mechanical and physical properties of CNFF indicated surface plasticization of CNFF, whic...

Future of Ionic Liquids for Chiral Separations in High-Performance Liquid Chromatography and Capillary Electrophoresis.

The ionic liquids have special features and, hence, called as liquid electrolytes, ionic melts, ionic glasses, fused salts, liquid salts, ionic fluids, designer solvents, green, and future solvents. Achiral and chiral ionic liquids have been used in enantioseparations of a variety of racemates in high-performance liquid chromatography and capillary electrophoresis. Chiral ionic liquids have received a good reputation in high-performance liquid chromatography and capillary electrophoresis because of their as...

Imidazolium-based ionic liquid surfactants as pseudostationary in combination with a chiral selector in micellar electrokinetic chromatography.

In recent years, ionic liquid-based surfactants have drawn more and more attention. As a new promising brand of surfactants, ionic liquid-based surfactants have their unique properties and superior aggregation behavior, which can be introduced as micellar pseudostationary in MEKC mode. In this paper, a novel ionic liquid-based surfactant, 1-butyl-3-methylimidazolum dodecyl sulfate [CMIm][CSO], was synthesized through ion exchange reaction and applied for the first time to form micellar as pseudostationary p...

Crystal-confined freestanding ionic liquids for reconfigurable and repairable electronics.

Liquid sensors composed of ionic liquids are rising as alternatives to solid semiconductors for flexible and self-healing electronics. However, the fluidic nature may give rise to leakage problems in cases of accidental damages. Here, we proposed a liquid sensor based on a binary ionic liquid system, in which a flowing ionic liquid [OMIm]PF is confined by another azobenzene-containing ionic liquid crystalline [OMIm]AzoO. Those crystal components provide sufficient pinning capillary force to immobilize fluid...

Insights from molecular dynamics simulations on structural organization and diffusive dynamics of an ionic liquid at solid and vacuum interfaces.

A reliable modelling approach is required for simultaneous characterisation of static and dynamic properties of bulk and interfacial ionic liquids (ILs). This is a prerequisite for a successful investigation of experimentally inaccessible, yet important properties, including those that change significantly with the distance from both vacuum and solid interfaces.

DTAB micelle formation in ionic liquid/water mixtures is determined by ionic liquid cation structure.

The high CMCs and low aggregation numbers of ionic micelles in the extreme electrolyte environment of ionic liquids (ILs) seem to be at odds with the effect of dilute aqueous electrolytes, which lower CMCs and promote elongated micelles. We hypothesise that the driving force for micellisation in ILs is determined by their underlying amphiphilic nanostructure, and that this can be controlled by mixing with water.

Correction to "Molecular Dynamics Simulations of Lithium Doped Ionic-Liquid Electrolytes".

Catanionic and chain-packing effects on surfactant self-assembly in the ionic liquid ethylammonium nitrate.

Micelle formation, particularly the formation of compact, globular micelles in the high ionic strength environment of an ionic liquid, seems to be at odds with the principle of opposing forces and the concept of the surfactant packing parameter. Here we examine how interactions between polar head-groups, with solvent ions, and chain packing affect self-assembly structure in ionic liquids.

Solvation Properties of Silver and Copper Ions in a Room Temperature Ionic Liquid: A First-Principles Study.

Understanding the behavior of metal ions in room temperature ionic liquids (ILs) is essential for predicting and optimizing performance for technologies like metal electrodeposition; however, many mechanistic details remain enigmatic, including the solvation properties of the ions in ILs and how they are governed by the intrinsic interaction between the ions and the liquid species. Here, we utilize first-principles molecular dynamics simulations to unravel and compare the key structural properties of Ag^{+}...

The nature of salt effect in enhancing the extraction of rare earths by non-functional ionic liquids: Synergism of salt anion complexation and Hofmeister bias.

Separation and recycling of rare-earths using ionic liquids as extractant are becoming a promising approach to replace traditional volatile organic solvents in recent years. Generally, the addition of some special salts could improve the extraction efficiency of rare-earths by numerous non-functional ionic liquids. However, knowledge behind the nature of the salt effect is limited. Here, we found that the enhancement in the extraction of rare-earth ions, Pr ions, using non-functional ionic liquid, [A336][NO...

Biocompatible Ionic Liquid based on Curcumin as Fluorescence Probe for Detecting Benzoyl Peroxide without the Interference of H2O2.

Accurate estimating the level of benzoyl peroxide (BPO) is of considerable significance because of its threat to humanity and environment. Several research efforts have been devoted to the detection of BPO by fluorescent method with high sen-sitivity and selectivity. However, it remains challenging to eliminate the interference of H2O2 due to its similar property to BPO. In this work, the first demonstration of fluorescent and colorimetric probe for specific detection of BPO without the disturbance of H2O2 ...

3D structure of the electric double layer of ionic liquid-alcohol mixtures at the electrochemical interface.

Mixtures of the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate with amphiphilic cosolvents, such as methanol and ethanol, nanoconfined between graphene walls are studied by means of molecular dynamics simulations and the results are compared with those of the pure ionic liquid and its mixtures with water confined in the same conditions. We investigate the adsorption of cosolvent molecules at the graphene walls as well as their distribution across the system. The results show that, due to a highe...

Cation Exchange at the Interfaces of Ultrathin Films of Fluorous Ionic Liquids on Ag(111).

In the context of applications with thin ionic liquid (IL) films on solid supports, we studied the ion distribution within mixed thin IL films by angle-resolved X-ray photoelectron spectroscopy. After deposition of 1-methyl-3-octylimidazolium hexafluorophosphate, [CCIm][PF], on top of a wetting layer (WL) of 3-methyl-1-(3,3,4,4,4-pentafluorobutyl)imidazolium hexafluorophosphate, [PFBMIm][PF], on Ag(111) at room temperature (RT), we find a preferential enrichment of the [PFBMIm] cation at the IL/vacuum inter...

Crystallization of mixtures of hydrophilic ionic liquids and water: Evidence of microscopic inhomogeneities.

We compare the effects of water, either intentionally added or due to absorption from the air, on the phase diagram of the hydrophilic 1-butyl-3-methylimidazolium dicyanamide ionic liquid, extending previous investigations to lower temperatures (down to 140 K), with a special attention to the changes of the environment of water molecules and the interface between water and ionic liquid as a function of temperature.

Non-fluorescent filters for fluorescence detection with in-line geometry.

Intrinsic emission from typical filters can unexpectedly contribute to the total measured signal in a fluorescence system. This emission becomes even more problematic for in-line geometry measurements where the excitation light can directly excite the emission filter. Potassium dichromate has minimal intrinsic fluorescence even with ultra-violet (UV) excitation. We show that a liquid sample can be tuned for its transmission properties by adding a base to the solution. This makes it attractive for use as an ...

Dynamics of Liquid Transfer from Nanoporous Stamps in High-Resolution Flexographic Printing.

Printing of ultrathin layers of polymeric and colloidal inks is critical for the manufacturing of electronics on non-conventional substrates such as paper and polymer films. Recently, we found that nanoporous stamps overcome key limitations of traditional polymer stamps in flexographic printing, namely enabling the printing of ultrathin nanoparticle films with micron-scale lateral precision. Here, we study the dynamics of liquid transfer between nanoporous stamps and solid substrates. The stamps comprise a ...

Effect of electrostatic interactions on the relaxation dynamics of pharmaceutical eutectics.

In this paper, we investigate the temperature dependent relaxation dynamics in the glassy and supercooled liquid state of dipolar and ionic eutectic mixtures made of two anesthetic agents (lidocaine and prilocaine) and their hydrochloride salts, respectively. In addition to eutectic phases containing 1:1 and 4:1 mol/mol of LD/PRL and LD-HCl/PRL-HCl, respectively, the relaxation properties of non-eutectic compositions and parent compounds are also studied. We found that electrostatic long-range forces dete...

Environmental Concerns Regarding Ionic Liquids in Biotechnological Applications.

Ionic liquids provide challenges and opportunities for sustainable industrial developments. However, the toxic impacts of ionic liquids reported by many researchers cannot be overlooked. Therefore, in this chapter, we introduce the antimicrobial activities of ionic liquids in bioprocesses and, in greater detail, we discuss their environmental impacts, including the toxicity, biodegradability, bioaccumulation, and mobility of ionic liquids. We believe that this presented information will support colleagues e...

Density Scaling in Ionic Glass-Former Controlled by Grotthuss Conduction.

We present investigations of the charge transport in an ionic glass-former carvedilol dihydrogen phosphate (CP) at various T-P-V thermodynamic conditions in terms of density scaling concept. The studied material was found to reveal superprotonic properties both at ambient end elevated pressure as proved by Walden rule. Surprisingly, from isobaric conductivity data, the relaxation times τσ presented in volume formalism showed no visual evidence of a liquid-glass transition. The different behavior of relaxa...

Development of highly sensitive HO redox sensor from electrodeposited tellurium nanoparticles using ionic liquid.

A new, non-enzymatic, low-cost sensor based on tellurium nanoparticles (TeNPs) for the analytical determination of HO has been proposed. An economically viable electrochemical technique was employed for the synthesis of TeNPs based non-enzymatic HO sensor. Thin films of TeNPs were successfully electrodeposited on fluorine-doped tin oxide (FTO) substrate using [BMIM][Ac] ionic liquid at 90 °C. The effect of deposition potential on the morphology, phase formation, and electrochemical characterisation of na...

Polarizability in ionic liquid simulations causes hidden breakdown of linear response theory.

The validity of linear response theory (LRT) in computer simulations of solvation dynamics, i.e. the time-dependent Stokes shift, has been debated widely during the last decades. Since the use of LRT is computationally less expensive than the calculation of the true nonequilibrium response, it is often invoked for large systems exhibiting a particularly slow solvation response, e.g. ionic liquids. In the case of ionic liquids, LRT does not only need to capture the correct overall dynamics of the system, but...


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