Ultrasensitive detection of nitroexplosive – picric acid via a conjugated polyelectrolyte in aqueous media and solid support

2015 ◽  
Vol 51 (33) ◽  
pp. 7207-7210 ◽  
Author(s):  
Sameer Hussain ◽  
Akhtar Hussain Malik ◽  
Mohammad Adil Afroz ◽  
Parameswar Krishnan Iyer
Keyword(s):  
Electrostatic Interactions ◽  
Picric Acid ◽  
Aqueous Media ◽  
Chitosan Film ◽  
Cost Effective ◽  
Paper Strip ◽  
Contact Mode ◽  
Conjugated Polyelectrolyte ◽  
Sensing Platform ◽  
Strip Test

Cationic polymer PMI detects picric acid at ppt levels via combination of ground state charge transfer, RET and electrostatic interactions. A paper strip test and a contact mode sensing platform using chitosan film confirm the method as simple, portable and cost-effective.

scholarly journals Contact Effect Contribution to the High Efficiency of Lithium Chloride Against the Mite Parasite of the Honey Bee

Insects ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 333 ◽  
Author(s):  
Éva Kolics ◽  
Kinga Mátyás ◽  
János Taller ◽  
András Specziár ◽  
Balázs Kolics
Keyword(s):  
Honey Bee ◽  
Lithium Chloride ◽  
Mode Of Action ◽  
High Efficiency ◽  
Paper Strip ◽  
Varroa Mite ◽  
Contact Mode ◽  
Action Mechanisms ◽  
Strip Test

Lithium chemicals have been proven to be very effective in eradicating Varroa destructor, the detrimental parasite of the honey bee; however, little is known about the side effects on brood and long term consequences on the colony. Earlier, it was proposed that the action mechanisms of lithium chloride do not include the contact mode. Here, we investigate this question using a paper strip test to demonstrate the concentration-dependent effectiveness of lithium in the contact mode of action, confirming that it is also a contact agent against the Varroa mite. According to our knowledge, this is the first report on the high varroicidal effect of lithium in the contact mode of action. Our findings may open up possibilities for novel ways of treatment (e.g., the use of lithiated strips) in the event that lithium salts become legal for use in apiculture.

Protein-based sensitive, selective and rapid fluorescence detection of picric acid in aqueous media

2014 ◽  
Vol 6 (21) ◽  
pp. 8464-8468 ◽  
Author(s):  
Xiangcheng Sun ◽  
Xiaoyu Ma ◽  
Challa V. Kumar ◽  
Yu Lei
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Fluorescence Detection ◽  
Electrostatic Interactions ◽  
Picric Acid ◽  
Aqueous Media ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Fast Detection ◽  
Novel Protein

A novel protein based fluorophore for sensitive, selective and fast detection of picric acid in an aqueous phase due to electron transfer, Förster resonance energy transfer and electrostatic interactions.

Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

2018 ◽  
Vol 9 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Shubhangi J. Mane-Gavade ◽  
Sandip R. Sabale ◽  
Xiao-Ying Yu ◽  
Gurunath H. Nikam ◽  
Bhaskar V. Tamhankar
Keyword(s):  
Green Synthesis ◽  
Color Change ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Suitable Condition ◽  
Cost Effective ◽  
Spectroscopic Studies ◽  
Calibration Plot ◽  
First Time

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

scholarly journals Modification of cotton fabrics with 2-diethylaminoethyl chloride for salt-free dyeing with anionic dyes

Cellulose ◽  
2021 ◽  
Author(s):  
Peixin Tang ◽  
Leilah-Marie E. Lockett ◽  
Mengxiao Zhang ◽  
Gang Sun
Keyword(s):  
Electrostatic Interactions ◽  
Light Exposure ◽  
Dye Adsorption ◽  
Cost Effective ◽  
Cotton Fabrics ◽  
Cotton Cellulose ◽  
Hydroxyl Groups ◽  
Anionic Dyes ◽  
Free System ◽  
Untreated Cotton

AbstractA chemical modification of cotton fabrics by 2-diethylaminoethyl chloride (DEAE-Cl) was achieved, and the resulted cotton fabrics demonstrated salt-free dyeing properties with anionic dyes. Nucleophilic property of hydroxyl groups in cotton cellulose was enhanced under alkaline conditions and could react with DEAE-Cl, a chemical possessing both nucleophilic and electrophilic sites. The monolayered DEAE-grafted cotton cellulose could further react with DEAE-Cl to form multiple cationic quaternary ammonium salts (denoted as DEAE@Cotton), which are highly interactive with anionic dye molecules. The strong electrostatic interactions between the DEAE@Cotton and the dyes eliminated the use of inorganic salts in cotton dyeing process. The chemical structure and property of DEAE@Cotton were characterized and compared with untreated cotton. The DEAE@Cotton can be dyed in a salt-free system, and the dye exhaustion was faster than the conventional dyeing method due to the robust electrostatic interactions of the fabrics with anionic dyes. The dyed fabrics demonstrated outstanding color fastness under repeated washing, light exposure, and crocking. The dye adsorption process on DEAE@Cotton follows Langmuir isotherm model (R2 = 0.9667). The mechanism of enhanced dyeability was experimentally proved by treating the fabric with other anionic dyes in a salt-free system, proving the process to be environmentally friendly and cost-effective. Graphic abstract

scholarly journals Green synthesis of crystalline bismuth nanoparticles using lemon juice

RSC Advances ◽  
2021 ◽  
Vol 11 (43) ◽  
pp. 26683-26686
Author(s):  
Md. Mahiuddin ◽  
Bungo Ochiai
Keyword(s):  
Green Synthesis ◽  
Aqueous Media ◽  
Cost Effective ◽  
Lemon Juice ◽  
Capping Agent ◽  
Bismuth Nanoparticles

Lemon juice effectively served as a reducing and capping agent for an easy, cost-effective, and green synthesis of crystalline bismuth nanoparticles (BiNPs) in basic aqueous media.

Detection of Picric Acid by Terpy-Based Metallo-Supramolecular Fluorescent Coordination Polymers in Aqueous Media

2017 ◽  
Vol 35 (4) ◽  
pp. 447-456 ◽  
Author(s):  
Zhongyu Ding ◽  
Hongqing Li ◽  
Wanqing Gao ◽  
Yiquan Zhang ◽  
Chunhua Liu ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Picric Acid ◽  
Aqueous Media

Fluorescent Nanoaggregates of Pentacenequinone Derivative for Selective Sensing of Picric acid in Aqueous Media

2012 ◽  
Vol 14 (12) ◽  
pp. 3112-3115 ◽  
Author(s):  
Vandana Bhalla ◽  
Ankush Gupta ◽  
Manoj Kumar
Keyword(s):  
Picric Acid ◽  
Aqueous Media

scholarly journals Effective Removal of Malachite Green from Aqueous Solutions Using Magnetic Nanocomposite: Synthesis, Characterization, and Equilibrium Study

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Ali Q. Alorabi
Keyword(s):  
Surface Area ◽  
Malachite Green ◽  
Chemical Activation ◽  
Aqueous Media ◽  
Kinetic Studies ◽  
Cost Effective ◽  
Magnetic Nanocomposite ◽  
Bet Surface Area ◽  
Isotherm Models ◽  
Order Kinetic

In this work, magnetized activated Juniperus procera leaves (Fe3O4@AJPL) were successfully prepared via chemical activation of JPL and in situ coprecipitation with Fe3O4. A Fe3O4@AJPL nanocomposite was successfully applied for the elimination of malachite green (MG) dye from aqueous media. The prepared Fe3O4@AJPL adsorbent was characterized by SEM, EDX, TEM, XRD, FTIR, TGA, and BET surface area analyses. The BET surface area and pore size of the Fe3O4@AJPL nanocomposite were found to be 38.44 m2/g and 10.6 nm, respectively. The XRD and FTIR results indicated the formation of a Fe3O4@AJPL nanocomposite. Different parameters, such as pH of the solution (3–8), adsorbent dosage (10–100 mg), temperature (25–45°C), contact time (5-240 min), and initial MG concentrations (20–350 mg/L), for the elimination of the MG dye using Fe3O4@AJPL were optimized and found to be 7, 50 mg, 45°C, 120 min, and 150 mg/L, respectively. The nonlinear isotherm and kinetic studies exhibited a better fitting to second-order kinetic and Langmuir isotherm models, with a maximum monolayer adsorption capacity of 318.3 mg/g at 45°C, which was highly superior to the previously reported magnetic nanocomposite adsorbents. EDX analyses confirmed the presence of nitrogen on the Fe3O4@AJPL surface after MG adsorption. The calculated thermodynamic factors indicated endothermic and spontaneous processes. The desorption of MG dye from Fe3O4@AJPL was performed using a solution of 90% ethanol. Finally, it could be concluded that the designed Fe3O4@AJPL magnetic nanocomposite will be a cost-effective and promising adsorbent for the elimination of MG from aqueous media.

scholarly journals A Novel Cesaro Fractal EBG-based Sensing Platform for Dielectric Characterization of Liquids

2020 ◽  
Author(s):  
Muhammad Zubair ◽  
Muhammad Qasim Mehmood ◽  
Kashif Riaz ◽  
Amna Zubair ◽  
Ali Arif
Keyword(s):  
Cost Effective ◽  
Good Precision ◽  
Dielectric Characterization ◽  
Sensing Applications ◽  
Sensing Platform ◽  
Dielectric Constant And Loss ◽  
Increased Sensitivity ◽  
Rms Error ◽  
Measured Sensitivity

<p>This paper presents a compact, cost-effective, and contactless fractal modified EBG-based microwave sensing platform for dielectric characterization of liquids by analyzing the variation in the reflection coefficient of an antenna. The reported design is composed of a triangular-shaped antenna (0.323λ­<sub>o </sub>x 0.323λ­<sub>o</sub>) placed over a 3 x 3 array of Cesaro fractal based EBG plane (0.7λ­<sub>o</sub> x 0.7λ­<sub>o</sub>) operating at 2.45 GHz. A significant enhancement of the E-field in the sensing region has been achieved with the incorporation of Cesaro fractals in the EBG plane which results in increased sensitivity and compactness. To validate its performance, absolute solutions of butan-1-ol, methanol, and water are loaded, and a maximum measured sensitivity of 0.875% and a maximum quality factor of 90.05 is achieved. Moreover, a maximum RMS error in retrieved values of dielectric constant and loss tangent of liquid under test is found to be 1.092% and 0.813%, respectively. Our demonstrated EBG-based sensor has a compact footprint with good precision, affordability, and ease of operation in detecting liquids for microwave sensing applications. </p><p><br></p>

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