Results 261 to 270 of about 28,173 (303)

Nanomolar colorimetric hypochlorite sensor in water

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019
Hypochlorous acid is present in several biological systems and plays a pivotal role in bioprocesses. The acid also finds application in industrial and synthetic spheres. The ecological toxicity of elevated hypochlorite concentrations in aqueous media has been thoroughly documented.
Sanay, Naha, A, Varalakshmi, Sivan, Velmathi   +2 more
openaire   +2 more sources

Colorimetric Sensors Measurement

2015
Despite some successes with electronic nose systems as described in Chap. 4, the limited range of sensor analyte interactions limits both their sensitivity for detection of compounds at low concentrations relative to their vapor pressures and their selectivity for discrimination between compounds; the latter proves especially problematic in ...
Xiaobo Zou, Jiewen Zhao
openaire   +1 more source

A bidentate borane as colorimetric fluoride ion sensor

Chem. Commun., 2004
The bright yellow bidentate diborane (3), obtained by reaction of 10-bromo-9-thia-10-boraanthracene (1) with dimesityl-1,8-naphthalenediylborate (2), serves as a colorimetric anion sensor and selectively complexes fluoride with an association constant greater than 5 × 109 M−1 in THF.
Stephané, Solé, François P, Gabbaï
openaire   +2 more sources

A colorimetric sensor for Fe2+ ion

Inorganic Chemistry Communications, 2014
Abstract A simple Schiff-based receptor 1 was synthesized and investigated its binding properties toward various metal ions in polar solvent (MeOH). Receptor 1 showed a dramatic color change from colorless to black which could easily be detected by the naked-eye upon binding with Fe 2 + .
Chang-Hung Chen, Chien Cho, Chin-Feng Wan, An-Tai Wu   +3 more
openaire   +1 more source

Colorimetric Sensor Technology in Food

2021
To objectively evaluate the odor quality, researchers have focused on finding a new way to design an odor sensor with the same performance as the human nose. This CSA array (CSA) technology mimics the mammalian olfactory system by digital imaging to quantify odorant.
Quansheng Chen, Hao Lin, Jiewen Zhao
openaire   +1 more source

Colorimetric metal ion sensors

Tetrahedron, 2011
Colorimetric sensors allow on site, real time qualitative, and semi-quantitative detection without complicated analytical instruments. Various aspects, such as different color changes, metal induced absorptions shifts, are reviewed.
Navneet Kaur, Subodh Kumar
openaire   +1 more source

A colorimetric sensor for formalin determination

AIP Conference Proceedings, 2019
A colorimetric sensor for determination of formalin using an entrapped acetylacetone sol - gel was investigated namely the sensor was based on the chemical reaction between formalin and entrapped acetylacetone sol - gel yielding a yellow product of 3,5-diacetyl-2,6-dihydrolutidine. The color change can be easily observed by naked-ked eyes.
Saluma Samanman, Surkunai Suding
openaire   +1 more source

Fluorescent and colorimetric sensors for environmental mercury detection

The Analyst, 2015
The development of fluorescent and colorimetric sensing strategies for environmental mercury is described.
Guiqiu, Chen, Zhi, Guo, Guangming, Zeng, Lin, Tang   +3 more
openaire   +2 more sources

Colorimetric Sensor Array for Soft Drink Analysis

Journal of Agricultural and Food Chemistry, 2006
Fourteen commercial soft drinks have been analyzed using colorimetric sensor arrays made from a set of 25 chemically responsive dyes printed on a hydrophobic membrane. Digital imaging of the dye array before and after immersion provides a color change profile as a unique fingerprint for each specific analyte.
Chen, Zhang, Kenneth S, Suslick
openaire   +2 more sources

Colorimetric and Fluorometric Sensor Arrays

2021
The design and construction of colorimetric/fluorometric sensor arrays with high selectivity and sensitivity has been of considerable attention as an emerging technology for mobile chemical detection. Nowadays, many approaches have been made to design sensors, fabricate arrays and generalize their usage areas especially in daily life applications and ...
openaire   +1 more source