Abstract
Chemical burns, mainly produced by acids, are a topic of concern. A new sensing material for the detection of strong acids able to be incorporated into textiles has been developed. The material is prepared by the covalent attachment of 2,2′,4,4′,4″-pentamethoxy triphenyl methanol to a mesoporous material which further is included in a nitro resin to obtain a colourless composite. The response of this composite to diverse acid solutions was tested showing the appearance of an intense purple colour (with a colour difference higher than 160) that can be monitored by the naked eye or could be easily digitised to feed an instrumental sensor. Reversibility and resistance to washing cycles were studied with positive results. Finally, the response of the sensing composite to acid vapours was assayed, observing a colour change similar to that found in solution.
Highlights
Acids are among the chemical commodities most widely produced
2,20,4,40,400 -pentamethoxy triphenyl methanol, known as pentamethoxy red, was selected as the indicator due to its chromogenic properties in response to pH. This dye is suitable for sensing strong acids because it is colourless at neutral pH, but turns to an intense reddish violet colour in the presence of strong acids [25]
The indicator was fixed on a UVM-7 mesoporous material using an alkyl iodine intermediate (UVM7-I) that binds the dye through a nucleophilic substitution of the iodine by the hydroxy group of the dye resulting in the UVM7-dye sensing material
Summary
Acids are among the chemical commodities most widely produced. They are used in the manufacture of various substances, such as solvents, chemicals, foods, fertilizers, medicines, and plastics. Sulphuric acid is used in almost all industries and it is the most commonly used chemical in the world. A nation’s sulphuric acid production has been a reasonably good indicator of its industrial strength and price variations have a direct influence in the price of metals, fertilizers, grains, and other commodities [1]. The most relevant acids in terms of production level and versatility are hydrochloric acid (used to clean metals, manufacturing food and organic compounds, regulate the pH level, and regenerate ion exchangers) and nitric acid (used in the manufacture of ammonium nitrate fertilizer, dyes, paints, drugs, and explosives). Acids are used by industries, and by consumers in applications such as cleaning, lime scale removal, or adjusting the pH in swimming pools
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