Pyrene-based aggregation-induced emission luminogens (AIEgens) with less colour migration for anti-counterfeiting applications

2021 ◽  
Author(s):  
Xiaohui Wang ◽  
Lirong Wang ◽  
Xiaoyu Mao ◽  
Qingsong Wang ◽  
Zhongfei Mu ◽  
...  
Keyword(s):  
High Concentration ◽  
Aggregation Induced Emission ◽  
High Concentration Range

A series of pyrene-based AIEgens have been employed in the preparation of fluorescent inks with less colour migration for anti-counterfeiting applications over the ultra-low to high concentration range and avoids the ACQ effect.

scholarly journals A model of bubble coalescence in the presence of a nonionic surfactant with a low bubble approach velocity

2021 ◽  
Author(s):  
Yuelin Wang ◽  
Huahai Zhang ◽  
Tiefeng Wang
Keyword(s):  
Nonionic Surfactant ◽  
Surfactant Concentration ◽  
Bubble Coalescence ◽  
Bulk Concentration ◽  
High Concentration ◽  
Coalescence Time ◽  
Approach Velocity ◽  
Marangoni Stress ◽  
High Concentrations ◽  
High Concentration Range

A bubble coalescence model for a solution with a nonionic surfactant and with a small bubble approach velocity was developed, in which the mechanism of how coalescence is hindered by Marangoni stress was quantitatively analyzed. The bubble coalescence time calculated for ethanol-water and MIBC-water systems were in good agreement with experimental data. At low surfactant concentrations, the Marangoni stress and bubble coalescence time increased with bulk concentration increase. Conversely, in the high concentration range, the Marangoni stress and coalescence time decreased with bulk concentration. Numerical results showed that the nonlinear relationship between coalescence time and surfactant concentration is determined by the mass transport flux between the film and its interface, which tends to diminish the spatial concentration variation of the interface, i.e., it acts as a “damper”. This damping effect increases with increased surfactant concentration, therefore decreasing the coalescence time at high concentrations.

Cellular membrane-anchored fluorescent probe with aggregation-induced emission characteristics for selective detection of Cu2+ ions

2017 ◽  
Vol 196 ◽  
pp. 377-393 ◽  
Author(s):  
Danni Liu ◽  
Shenglu Ji ◽  
Heran Li ◽  
Liang Hong ◽  
Deling Kong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Cell Membrane ◽  
Water Solubility ◽  
Live Cells ◽  
Probe Design ◽  
Specific Cell ◽  
Selective Detection ◽  
High Concentration ◽  
Aggregation Induced Emission ◽  
Emissive Probes

The exploration of advanced fluorescent probes that can detect divalent copper (Cu2+) in aqueous environments and even in live organisms is particularly valuable for understanding the occurrence and development of Cu2+-related diseases. In this work, we report the design and synthesis of an aggregation-induced emission luminogen (AIEgen)-based probe (TPE-Py-EEGTIGYG) by integrating an AIEgen, TPE-Py, with a peptide, EEGTIGYG, which can selectively detect Cu2+ in both aqueous solution and live cells. Peptide EEGTIGYG has dual functionality in the probe design, namely improving water solubility and providing specific cell membrane-binding ability. TPE-Py-EEGTIGYG can self-assemble into nanoaggregates at high concentration in aqueous solution (e.g., 25 μM), which possess large fluorescence output due to the restriction of intramolecular rotation of the phenyl rings on TPE-Py. The fluorescence of the TPE-Py-EEGTIGYG nanoaggregates can be significantly quenched by Cu2+ but not by other metal ions, achieving the selective detection of Cu2+ in aqueous media. Furthermore, TPE-Py-EEGTIGYG can exist as a molecular species and is very weakly fluorescent in dilute aqueous solution (e.g., 5 μM), but can however largely switch on its fluorescence upon specifically anchoring onto the cell membrane. The emissive probes on the cell membrane can be used for the detection of Cu2+ ions that move in and out of cells with a fluorescence “turn-off” mode.

scholarly journals Regulation by External K+ in a Maize Inward Shaker Channel Targets Transport Activity in the High Concentration Range

2005 ◽  
Vol 17 (5) ◽  
pp. 1532-1548 ◽  
Author(s):  
Yan-Hua Su ◽  
Helen North ◽  
Claude Grignon ◽  
Jean-Baptiste Thibaud ◽  
Hervé Sentenac ◽  
...  
Keyword(s):  
Transport Activity ◽  
High Concentration ◽  
High Concentration Range ◽  
External K

Extraction of Tungsten with Trialkylamine - Effect of pH

2001 ◽  
Vol 66 (9) ◽  
pp. 1407-1419
Author(s):  
Jaroslav Procházka ◽  
Aleš Heyberger ◽  
Jan Horáček ◽  
Eva Volaufová ◽  
Jitka Voborská ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Sodium Tungstate ◽  
High Concentration ◽  
Tungsten Atom ◽  
Extraction Equilibrium ◽  
Alkyl Chains ◽  
Flat Part ◽  
High Concentration Range ◽  
Hydrolysis Of ◽  
Extraction Isotherms

Extraction equilibrium in the system aqueous solution of sodium tungstate-solution of trialkylamine in a mixed diluent was investigated. A tertiary amine with C7-C9 straight alkyl chains was dissolved in a mixture of tributyl phosphate and kerosene and presaturated with sulfuric acid to give normal trialkylamine sulfate. Extraction isotherms at 25 °C and at several constant values of equilibrium pH were measured in a broad range of aqueous tungstate concentrations. pH 2.0-6.0 was adjusted by addition of sulfuric acid during equilibration. The equilibrium tungstate and sulfate contents in both phases were determined. A typical tungstate isotherm exhibits a steep ascending part in the low concentration range, corresponding to the region of anion exchange, and a flat part in the high concentration range, where the acid content in the organic phase is virtually exhausted. The level of the flat part decreases with growing pH, corresponding to the increasing number of negative charges per tungsten atom in the tungstate polyanions extracted. At pH > 5, also the effect of hydrolysis of amine sulfate could be detected.

A Polar Liquid Zwitterion Does Not Critically Destroy Cytochrome c at High Concentration: An Initial Comparative Study with a Polar Ionic Liquid

2019 ◽  
Vol 72 (2) ◽  
pp. 139 ◽  
Author(s):  
Kosuke Kuroda ◽  
Chiaki Kodo ◽  
Kazuaki Ninomiya ◽  
Kenji Takahashi
Keyword(s):  
Ionic Liquid ◽  
Cytochrome C ◽  
Soret Band ◽  
Liquid Solution ◽  
Acetate Solution ◽  
High Concentration ◽  
Liquid Solutions ◽  
High Concentration Range ◽  
Ionic Liquid Solution ◽  
Better Than

A polar carboxylate-type zwitterion with a small volume of water can dissolve cytochrome c without significant disruption, compared with the case of a popular polar carboxylate-type ionic liquid, 1-ethyl-3-methylimidazolium acetate. A change in the Soret, Q, and 615nm bands was not observed in the 80 wt-% polar zwitterion solution, whereas a shift in the Soret band, diminishing Q band, and appearance of the 615nm band was found in the 80 wt-% polar ionic liquid solution. It suggests that concentrated polar ionic liquid solutions critically disrupt the structure of cytochrome c, and the polar zwitterion solution used in this study was better than a 1-ethyl-3-methylimidazolium acetate solution in a high concentration range.

Plasmalemma and Tonoplast Influxes of Potassium in Barley Roots, and Interpretation of the Absorption Isotherm at High Concentrations

1975 ◽  
Vol 2 (2) ◽  
pp. 177 ◽  
Author(s):  
JB Robinson ◽  
GG Laties
Keyword(s):  
Steady State ◽  
High Concentration ◽  
Experimental Conditions ◽  
Apparent Increase ◽  
Absorption Isotherm ◽  
Low Salt ◽  
High Concentrations ◽  
High Concentration Range ◽  
Kinetics Of ◽  
Potassium Exchange

Estimates of plasmalemma influx and steady-state vacuolar influx of potassium in low-salt barley roots have been obtained in the concentration range 10-80 mM by the use of controlled loading and washing times. Both fluxes are reduced by preloading the tissue in solutions containing potassium. When the experimental temperature is increased from 20 to 30°C, an apparent increase in the steady-state vacuolar influx occurs; separation of this flux from the apparent plasmalemma influx is not possible. The data support the hypothesis that the kinetics of potassium exchange in barley root tissue may be confounded by both loading time and temperature, and thus interpretation of the influx isotherm in the high concentration range is difficult. Where experiments are carried out at 20-25°C the steady- state vacuolar influx is measured unless closely defined experimental conditions obtain. At higher temperatures the plasmalemma influx may be measured.

scholarly journals Analytical evaluation of Kone Microlyte determination of ionized magnesium

1994 ◽  
Vol 40 (1) ◽  
pp. 52-55 ◽  
Author(s):  
H E van Ingen ◽  
H J Huijgen ◽  
W T Kok ◽  
G T Sanders
Keyword(s):  
Limit Of Detection ◽  
Analytical Evaluation ◽  
High Concentration ◽  
Serum Samples ◽  
Ionized Magnesium ◽  
Carrier Liquid ◽  
The Mean ◽  
High Concentration Range ◽  
Induced Changes

Abstract We performed an analytical evaluation of a commercially available instrument for determining ionized magnesium through use of a neutral carrier, liquid-membrane-based ion-selective electrode. Reproducibility (CV 2-4%), linearity (0.30-2.50 mmol/L), lower limit of detection (0.30 mmol/L), and absence of interference from Ca2+ indicate adequate performance for measuring ionized magnesium in plasma or serum samples in the normal to high-concentration range. Sodium in excess of 150 mmol/L caused a negative bias, which can be explained by ionic strength-induced changes in activity coefficients. The use of heparin as an anticoagulant must be restricted to concentrations < 15 units/mL because of the binding of magnesium to heparin. The mean +/- SD concentration of ionized magnesium and its fraction of total magnesium in 76 healthy volunteers were 0.56 +/- 0.05 mmol/L and 0.65 +/- 0.04, respectively.

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