scholarly journals Colorimetric Monitoring of a Chemical Reaction Using Cesium Lead Halide Assays

2021 ◽  
Author(s):  
Tennyson L. Doane ◽  
Kevin J. Cruz-Lopez ◽  
Mathew M. Maye
Keyword(s):  
Crystal Structure ◽  
Chemical Reaction ◽  
Rate Constants ◽  
Blue Shift ◽  
Model System ◽  
System A ◽  
Bromide Ion ◽  
Halide Exchange ◽  
Kinetics Of ◽  
Lead Halide

Cesium lead halide (CsPbX3, X = F, Cl, Br, I ) nanomaterials have a number of novel optoelectronic and physical properties, both of which are tailorable based on halide type and concentration, such as halide composition-dependent photoluminescence and rapid halide exchange while maintaining crystal structure. In this work we take advantage of these properties and use colloidal CsPbI3 nanoparticles as a proxy and colorimetric sensor of a chemical reaction in real-time. A solvolysis reaction between 2-bromo-2-methylbutane and butanol was used as a model system. A product of reaction, a bromide ion, could be detected via halide exchange with CsPbI3, by way of a quantitative blue shift (Δλ) in photoluminescence. The kinetics of this shift was calibrated against a known Br - source, which allowed for conversion to apparent values solvation kinetics. The observed rate constants (k) and corresponding activation energies (Ea) measured via the CsPbI3 probe were consistent with literature values for the reaction, confirming the validity of the approach.

Fluorescent methylammonium lead halide perovskite quantum dots as a sensing material for the detection of polar organochlorine pesticide residues

The Analyst ◽  
2020 ◽  
Vol 145 (20) ◽  
pp. 6683-6690
Author(s):  
Yayu Yang ◽  
Ailing Han ◽  
Sijia Hao ◽  
Xia Li ◽  
Xiaoyu Luo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Organochlorine Pesticide ◽  
Pesticide Residues ◽  
Blue Shift ◽  
Sensing Material ◽  
Organochlorine Pesticide Residues ◽  
Perovskite Quantum Dots ◽  
Halide Perovskite ◽  
Lead Halide

The doping of polar OCPs in MAPB-QDs induced the change in the crystal structure and blue-shift of fluorescence.

Crystal Structure and Redox Behavior of a Novel Siderophore Model System:  A Trihydroxamato−Iron(III) Complex with Intra- and Interstrand Hydrogen Bonding Networks

2001 ◽  
Vol 40 (2) ◽  
pp. 190-191 ◽  
Author(s):  
Kenji Matsumoto ◽  
Tomohiro Ozawa ◽  
Koichiro Jitsukawa ◽  
Hisahiko Einaga ◽  
Hideki Masuda
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Model System ◽  
Redox Behavior ◽  
System A ◽  
Hydrogen Bonding Networks

scholarly journals Kinetics and Selectivity in Host-Guest Chemistry

2014 ◽  
Vol 70 (a1) ◽  
pp. C1016-C1016
Author(s):  
Luigi Nassimbeni
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Single Crystal ◽  
Rate Constants ◽  
Molecular Level ◽  
Activation Energies ◽  
Decomposition Reactions ◽  
Kinetics Of ◽  
Guest Chemistry

A bulky substituted binaphthyl diol host has been employed in the separation of picolines. The selectivity profiles for pairs of picolines and for all three picolines, have been determined. The results are correlated with measurements of thermal stability and structure. The solid-vapour kinetics of a xanthenol host with volatile guests have been studied. Both the enclathration and the decomposition reactions were analysed. The kinetic laws, rate constants and activation energies were derived. Special balances which were constructed for the kinetics of enclathration will be described. The single crystal to single crystal reaction of a xanthenol host, in which the chlorobenzene guest was exchanged with toluene, was followed at the molecular level by repeated crystal structure analyses.

Growth Kinetics of Quantum Size ZnO Particles

1998 ◽  
Vol 536 ◽  
Author(s):  
E. M. Wong ◽  
J. E. Bonevich ◽  
P. C. Searson
Keyword(s):  
Growth Kinetics ◽  
Ostwald Ripening ◽  
Chemical Potential ◽  
Colloidal Suspensions ◽  
Green Emission ◽  
Blue Shift ◽  
Constant Current ◽  
Mass Model ◽  
Zno Particles ◽  
Kinetics Of

AbstractColloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz, Slyozov, Wagner theory for Ostwald ripening. In this model, the higher curvature and hence chemical potential of smaller particles provides a driving force for dissolution. The larger particles continue to grow by diffusion limited transport of species dissolved in solution. Thin films were fabricated by constant current electrophoretic deposition (EPD) of the ZnO quantum particles from these colloidal suspensions. All the films exhibited a blue shift relative to the characteristic green emission associated with bulk ZnO. The optical characteristics of the particles in the colloidal suspensions were found to translate to the films.

Submerged upflow biotower operation and computer simulation

1994 ◽  
Vol 30 (11) ◽  
pp. 143-146
Author(s):  
Ronald D. Neufeld ◽  
Christopher A. Badali ◽  
Dennis Powers ◽  
Christopher Carson
Keyword(s):  
Computer Simulation ◽  
Benzoic Acid ◽  
Computer Model ◽  
Rate Constants ◽  
Batch Mode ◽  
Operational Conditions ◽  
First Order ◽  
Low Concentrations ◽  
Biological Transformation ◽  
Kinetics Of

A two step operation is proposed for the biodegradation of low concentrations (< 10 mg/L) of BETX substances in an up flow submerged biotower configuration. Step 1 involves growth of a lush biofilm using benzoic acid in a batch mode. Step 2 involves a longer term biological transformation of BETX. Kinetics of biotransformations are modeled using first order assumptions, with rate constants being a function of benzoic acid dosages used in Step 1. A calibrated computer model is developed and presented to predict the degree of transformation and biomass level throughout the tower under a variety of inlet and design operational conditions.

Kinetics of hydrolysis of peroxodisulphate ions in acidic medium to peroxomonosulphuric acid

1981 ◽  
Vol 46 (5) ◽  
pp. 1229-1236 ◽  
Author(s):  
Jan Balej ◽  
Milada Thumová
Keyword(s):  
Ionic Strength ◽  
Rate Constants ◽  
Acidic Medium ◽  
Measured Data ◽  
Molar Ratios ◽  
Starting Solution ◽  
Kinetics Of Hydrolysis ◽  
Rate Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

The rate of hydrolysis of S2O82- ions in acidic medium to peroxomonosulphuric acid was measured at 20 and 30 °C. The composition of the starting solution corresponded to the anolyte flowing out from an electrolyser for production of this acid or its ammonium salt at various degrees of conversion and starting molar ratios of sulphuric acid to ammonium sulphate. The measured data served to calculate the rate constants at both temperatures on the basis of the earlier proposed mechanism of the hydrolysis, and their dependence on the ionic strength was studied.

Kinetics of the reaction between hexamethylenediisocyanate and 1-pentanol

1983 ◽  
Vol 48 (11) ◽  
pp. 3279-3286
Author(s):  
Slavko Hudeček ◽  
Miloslav Bohdanecký ◽  
Ivana Hudečková ◽  
Pavel Špaček ◽  
Pavel Čefelín
Keyword(s):  
Liquid Chromatography ◽  
Rate Constants ◽  
Reversed Phase ◽  
Order Reaction ◽  
Second Order ◽  
Second Order Reaction ◽  
Reversed Phase Liquid Chromatography ◽  
Consecutive Reactions ◽  
Phase Liquid ◽  
Kinetics Of

The reaction between hexamethylenediisocyanate and 1-pentanol in toluene was studied by means of reversed-phase liquid chromatography. By employing this method, it was possible to determine all components of the reaction mixture including both products, i.e. N-(6-isocyanate hexyl)pentylcarbamate and N,N'-bis(pentyloxycarbonyl)hexamethylenediamine. Relations for the calculation of kinetic constants were derived assuming a competitive consecutive second-order reaction. It was demonstrated that the reaction involved in this case is indeed a second-order reaction, and the rate constants of the first and second consecutive reactions were determined.

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