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Electrospun Nanofibrous Webs for Gas Sensing Applications
Published in Mangala Joshi, Nanotechnology in Textiles, 2020
Bentolhoda Heli, Hanan Abdali, Abdellah Ajji
The drop-cast and dip-coated nanofibrous substrates could be used as an ultrasensitive membrane for gas detection, even though there remains great concern about the dyes leaching into the monitored medium and their toxicity [32]. Therefore, a dye covalently bonded to the surface of electrospun nanofibers and its effect on the efficiency of detection were compared to doped dye. Geltmeyer et al. exploited ceramic nanofibers composed of TEOS combined with functionalized 3-aminopropyl triethoxysilane (APTES) [127]. The ceramic nanofibers were impregnated with indicator dyes, methyl red (MR) and methyl yellow (MY). In contrast, the covalent bonding between the carboxyl groups of the MR and amine groups of APTES led to a covalent-linked dye. Consequently, the ceramic membrane doped with MY and covalently linked MR showed similar behavior and visual color changes on exposure to both NH3 and HCl vapors, while the samples of MR-doped nanofibers were just as sensitive toward NH3 vapors. The proposed silicon oxide–functionalized dye membrane was completely reversible and allowed for multiple uses [127]. In the case of covalent modification, the functional groups responsible for the color changing mechanism should remain free to preserve the halochromic behavior of the dye [128].
Physical Properties of Individual Groundwater Chemicals
Published in John H. Montgomery, Thomas Roy Crompton, Environmental Chemicals Desk Reference, 2017
John H. Montgomery, Thomas Roy Crompton
Synonyms: AI3-08903; Atul fast yellow R; Benzeneazodimethylaniline; Brilliant fast oil yellow; Brilliant fast spirit yellow; Brilliant fast yellow; Brilliant oil yellow; Butter yellow; Cerasine yellow CG; CCRIS 251; C.I. 11020; C.I. Solvent Yellow 2; DAB; Dimethylaminobenzene; 4-Dimethylaminoazobenzene; 4-(N,N-Dimethylamino)azobenzene; N,N-Dimethyl-4-aminoazobenzene; N,N-Dimethyl-p-aminoazobenzene; Dimethylaminoazobenzol; 4-Dimethylaminoazobenzol; 4-Dimethylaminophenylazobenzene; N,N-Dimethyl-p-azoaniline; N,N-Dimethyl-4-(phenylazo)benzamine; N,N-Dimethyl-p-(phenylazo)benzamine; N,N-Dimethyl-4-(phenylazo)benzeneamine; N,N-Dimethyl-p-(phenylazo)benzenamine; Dimethyl yellow; Dimethyl yellow analar; Dimethyl yellow N,N-dimethylaniline; DMAB; EINECS 200-455-7; Enial yellow 2G; Fast oil yellow B; Fast yellow; Fast yellow A; Fast yellow AD OO; Fast yellow ES; Fast yellow ES extra; Fast yellow extra concentrate; Fast yellow R; Fast yellow R (8186); Grasal brilliant yellow; Methyl yellow; NSC 6236; Oil yellow; Oil yellow 20; Oil yellow 2625; Oil yellow 7463; Oil yellow BB; Oil yellow D; Oil yellow DN; Oil yellow FF; Oil yellow FN; Oil yellow G; Oil yellow G-2; Oil yellow 2G; Oil yellow GG; Oil yellow GR; Oil yellow II; Oil yellow N; Oil yellow PEL; Oleal yellow 2G; Organol yellow ADM; Orient oil yellow GG; PDAB; Petrol yellow WT; RCRA waste number U093; Resinol yellow GR; Resoform yellow GGA; Silotras yellow T2G; Solvent yellow; Solvent yellow 2; Somalia yellow A; Stear yellow JB; Sudan GG; Sudan yellow; Sudan yellow 2G; Sudan yellow 2GA; Toyo oil yellow G; UN 2811; UN 3143; USAF EK-338; Waxoline yellow AD; Waxoline yellow ADS; Yellow G soluble in grease.
Applications of aged powders of spray-dried whey protein isolate and ascorbic acid in the field of food safety
Published in Drying Technology, 2023
Chao Zhong, Songwen Tan, Zelin Zhou, Xia Zhong, Timothy Langrish
Microbial contamination causes reductions in food shelf life, and it increases the possibility of food-borne illnesses. For consumers, the changed texture, flavor and color of the food may be unacceptable. To deal with this problem, some food sensors[6–8] have been developed, which also help to mitigate food waste.[9] With the help of specific reactions, food sensors may be used to indicate food quality or safety. The pH of the chemical environment for foods can be changed by microbial spoilage.[10] When food is stored, transported or distributed, a pH indicator can be used to monitor its pH condition and give information about its quality. An indicator may respond through visible color development in response to pH changes.[11,12] The pH may be detected using an indicator, and a simple, low-cost, rapid and environmentally friendly sensor is helpful.[5] In order to detect volatile compounds that are acidic or basic, changes in the visual appearance of some pH dyes may be considered. Colorimetric pH indicator dyestuffs may be used, including bromothymol blue, bromophenol blue, bromocresol purple, methyl red, bromocresol green, methyl orange, methyl yellow, phenol red.[13] As pH indicators, methyl red (MR) and bromocresol purple (BCP) are toxic.