Si-corrole-based fluoride fluorometric turn-on sensor

2020 ◽  
Vol 24 (05n07) ◽  
pp. 929-937
Author(s):  
Ewa Jaworska ◽  
Fabrizio Caroleo ◽  
Corrado Di Natale ◽  
Krzysztof Maksymiuk ◽  
Roberto Paolesse ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Linear Dependence ◽  
Porous Membrane ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Fluoride Ions ◽  
Acidic Solutions ◽  
Turn On ◽  
New Type ◽  
Receptor Layer

We present here a new type of fluoride ion optode, constituted by a highly lipophilic PVDF porous membrane modified with a liquid receptor layer containing the emission-active Si corrole F[Formula: see text] selective ionophore. For the optimized composition of the receptor layer, in acidic solutions an increase of Si-corrole emission was observed by increasing fluoride ion concentration, a behavior different from most porphyrinoid-based optical sensors. An observed linear dependence of the Si corrole emission intensity (read at 635 nm) was within the range 10[Formula: see text] to 10[Formula: see text] M of fluoride ions.

scholarly journals EFFECTIVENESS OF SILVER DIAMINE FLUORIDE AND PROPOLIS FLUORIDE VARNISH APPLICATION ON DENTIN WITHIN 60 DAYS

2019 ◽  
pp. 190-193
Author(s):  
SRI ANGKY SOEKANTO ◽  
PRISCILLA DAYANARA ◽  
HABLI DAVIQ ◽  
AGOENG TJAHAJANI SARWONO ◽  
MUHAMAD SAHLAN
Keyword(s):  
Vickers Microhardness ◽  
Deionized Water ◽  
Ion Concentration ◽  
Permanent Teeth ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Fluoride Ions ◽  
Silver Diamine Fluoride ◽  
Group Assignment ◽  
Occlusal Surfaces

Objective: This study sought to analyze the effectiveness of silver diamine fluoride (SDF) and propolis fluoride (PPF) varnish application on dentinwithin 60 days.Methods: We divided 60 blocks (4 mm × 4 mm × 2 mm) of human permanent teeth dentin specimens into six time-based groups: 0 days, 1 day, 7 days,14 days, 30 days, and 60 days. We then applied 20 μL SDF and PPF varnish to the specimens’ occlusal surfaces. For the fluoride test, all specimenswere submerged in deionized water, while for the flavonoid test, specimens were submerged in a solution of 20% ethanol. In the treatment group,specimens were shaken for 30 min at 45 rpm (every day) for 0–60 days, depending on group assignment. An ion selective electrode was used tomeasure fluoride ions and a spectrophotometer with 425 nm wavelength absorbance measured flavonoid absorbance. Dentin microhardness wasmeasured for 30 and 60 days sample using the Vickers microhardness tester.Results: There was an increase in fluoride ion concentration after SDF and PPF application to the dentin samples, while SDF released more fluorideions than PPF. Increased flavonoid absorbance was observed after PPF application. Dentine microhardness increased after SDF and PPF application.Conclusion: SDF and PPF application on dentin is effective within 60 days.

Color-tunable tetracoordinated organoboron complexes exhibiting aggregation-induced emission for the efficient turn-on detection of fluoride ions

2021 ◽  
Author(s):  
Yanyu Qi ◽  
Xiaosong Cao ◽  
Yang Zou ◽  
Chuluo Yang
Keyword(s):  
Fluoride Ion ◽  
Fluoride Ions ◽  
Aggregation Induced Emission ◽  
Turn On ◽  
Color Tunable

A aggregation-induced emission-characterized tetracoordinated organoboron complex-based probe for the turn-on detection of fluoride ion is reported.

Automated Fluoride Ion Determination

1977 ◽  
Vol 14 (1-6) ◽  
pp. 269-274 ◽  
Author(s):  
David C. Cowell
Keyword(s):  
Continuous Flow ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Automated Method ◽  
Electrode Response ◽  
Kinetics Of ◽  
Fluoride Ion Selective Electrode ◽  
Flow Techniques

An automated method is described, using standard continuous flow techniques, for the determination of urine fluoride ion concentration using a fluoride ion selective electrode. It is shown that the kinetics of the electrode response to changes in fluoride ion can be used for the accurate measurement of fluoride ion concentration in urine, and that equilibration of the electrode response is not a prerequisite for the measurement of fluoride ion. Recovery experiments are in the range 83 to 90%; in-batch precision is between 0·9 and 1·6% and carryover 2·5% or less.

Fiber-optic Michelson interferometer based on α-Fe2O3/ZrO2 sensing membrane and its application in trace fluoride-ion detection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zizheng Yue ◽  
Wenlin Feng
Keyword(s):  
Silver Film ◽  
Fiber Optic ◽  
Michelson Interferometer ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Ion Detection ◽  
Core Fiber ◽  
Sensing Membrane

Abstract In this work, a fiber-optic fluoride-ion-detection Michelson interferometer based on the thin-core fiber (TCF) and no-core fiber (NCF) coated with α-Fe2O3/ZrO2 sensing film is proposed and presented. The single-mode fiber (SMF) is spliced with the TCF and NCF in turn, and a waist-enlarged taper is spliced between them. Then, a silver film is plated on the end face of NCF to enhance the reflection. After the absorption of fluoride ion by the sensing film, the effective refractive index (RI) of the coated cladding will change, which leads to the regular red shift of the interference dip with the increasing fluoride-ion concentration. Thus, the fluoride-ion concentrations can be determined according to the corresponding dip wavelength shifts. The results show that the sensor has an excellent linear response (R 2 = 0.995) with good sensitivity (8.970 nm/ppm) when the fluoride-ion concentration is in the range of 0–1.5 ppm. The response time is about 15 s. The sensor has the advantage of good selectivity, good temperature and pH stabilities, and can be applied to detect fluoride ion effectively.

“Turn-On” Conjugated Polymer Fluorescent Chemosensor for Fluoride Ion

2003 ◽  
Vol 36 (8) ◽  
pp. 2584-2586 ◽  
Author(s):  
Hui Tong ◽  
Lixiang Wang ◽  
Xiabin Jing ◽  
Fosong Wang
Keyword(s):  
Conjugated Polymer ◽  
Fluorescent Chemosensor ◽  
Fluoride Ion ◽  
Turn On

scholarly journals Unpredicted Concentration-Dependent Sensory Properties of Pyrene-Containing NBN-Doped Polycyclic Aromatic Hydrocarbons

Molecules ◽  
2022 ◽  
Vol 27 (1) ◽  
pp. 327
Author(s):  
Hang Xiao ◽  
Tao Li ◽  
Xiao-Li Sun ◽  
Wen-Ming Wan ◽  
Hongli Bao ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Aromatic Diamine ◽  
Fluoride Ion ◽  
Artificial Light ◽  
Dehydration Reaction ◽  
Turn On ◽  
Potential Applications ◽  
Polycyclic Aromatic ◽  
Nir Dye

Pyrene molecules containing NBN-doped polycyclic aromatic hydrocarbons (PAHs) have been synthesized by a simple and efficient intermolecular dehydration reaction between 1-pyrenylboronic acid and aromatic diamine. Pyrene-B (o-phenylenediamine) with a five-membered NBN ring and pyrene-B (1,8-diaminonaphthalene) with a six-membered NBN ring show differing luminescence. Pyrene-B (o-phenylenediamine) shows concentration-dependent luminescence and enhanced emission after grinding at solid state. Pyrene-B (1,8-diaminonaphthalene) exhibits a turn-on type luminescence upon fluoride ion addition at lower concentration, as well as concentration-dependent stability. Further potential applications of Pyrene-B (o-phenylenediamine) on artificial light-harvesting film were demonstrated by using commercial NiR dye as acceptor.

scholarly journals Environmentally friendly method for regeneration of copper chloride acidic solutions used in etching of printed circuits

2017 ◽  
Vol 18 ◽  
pp. 01021
Author(s):  
Dorota Kopyto ◽  
Wit Baranek ◽  
Zbigniew Myczkowski ◽  
Katarzyna Leszczyńska-Sejda ◽  
Michał Drzazga ◽  
...  
Keyword(s):  
Control Systems ◽  
Copper Chloride ◽  
Environmentally Friendly ◽  
Acidic Solutions ◽  
Printed Circuits ◽  
Innovative Method ◽  
Reactor Construction ◽  
New Type ◽  
Oxygen Utilisation ◽  
Environmentally Friendly Method

Etching of copper with acidic CuCl2 solution is a widely used chemical method in printed circuits production. During the process, the solution is enriched in Cu(I) ions, resulting in reduction and then loss of etching bath capacity. In order to ensure the required etching kinetics, the solution is regenerated by oxidation of Cu(I) to Cu(II). The industrially applied Cu(I) oxidants are, e.g.: Cl2, chlorates. Their application is expensive and associated with drawbacks related to health, safety and environmental hazards (e.g. Cl2 emission). In the result of long-standing cooperation between the IMN and MATUSEWICZ Budowa Maszyn, an innovative, original and environmentally friendly method of acidic solutions regeneration used during printed circuits etching was developed. A new-type reactor equipped with oxidation monitoring-control systems using oxygen or oxygen-enriched air was applied. The reactor construction enables to run the process with oxygen circulation in the reactor, ensures full oxygen utilisation in the regeneration process, achievement of the required performance and process rate, and eliminates expensive, hazardous and often toxic reagents. This is an innovative method, and since there are no analogous technologies currently known and used in Europe and worldwide, the presented method is technologically, economically and ecologically unrivalled.

scholarly journals Improved Field Emission Properties of Carbon Nanostructures by Laser Surface Engineering

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1931
Author(s):  
Minh Nhat Dang ◽  
Minh Dang Nguyen ◽  
Nguyen Khac Hiep ◽  
Phan Ngoc Hong ◽  
In Hyung Baek ◽  
...  
Keyword(s):  
Field Emission ◽  
Edge Effect ◽  
Carbon Nanostructures ◽  
Surface Engineering ◽  
Nanostructured Carbon ◽  
Carbon Cathode ◽  
Electron Sources ◽  
Field Emission Properties ◽  
Turn On ◽  
New Type

We herein present an alternative geometry of nanostructured carbon cathode capable of obtaining a low turn-on field, and both stable and high current densities. This cathode geometry consisted of a micro-hollow array on planar carbon nanostructures engineered by femtosecond laser. The micro-hollow geometry provides a larger edge area for achieving a lower turn-on field of 0.70 V/µm, a sustainable current of approximately 2 mA (about 112 mA/cm2) at an applied field of less than 2 V/µm. The electric field in the vicinity of the hollow array (rim edge) is enhanced due to the edge effect, that is key to improving field emission performance. The edge effect of the micro-hollow cathode is confirmed by numerical calculation. This new type of nanostructured carbon cathode geometry can be promisingly applied for high intensity and compact electron sources.

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