Formation of pH-Responsive Cotton by the Adsorption of Methyl Orange Dye

Abstract

The interest in pH-sensitive textile sensors is growing in the global market. Due to their low-cost production, mechanical stability, flexibility, air-permeability, washability, and reusability, they are more suitable than electronic sensor systems. The research tailored the pH-sensitive textile by applying the pH indicator methyl orange to the cotton fabric during conventional dyeing. Adsorption of methyl orange dye to cotton fabric is hindered due to electrostatic repulsive forces between dye anions and negatively charged cotton fibre. To overcome this problem, chemical modification of cotton fabric using a commercial product was performed. The pH sensitivity of the dyed fabric was spectrophotometrically evaluated. In addition, the colour fastness of dyed cotton fabric to washing, light, hot pressing and rubbing was investigated according to valid SIST EN ISO standards. The research results show that the pH-responsive cotton fabric was successfully developed. The chemical modification of cotton fabric is crucial for the increased adsorption of methyl orange dye. The halochromic effect was not only perceived spectrophotometrically but also with the naked eye. The developed halochromic cotton fabric showed poor colour fastness to light and good colour fastness to hot pressing and rubbing, while no significant improvement in colour fastness to washing was observed, even though the fabric was after-treated with a cationic fixing agent. Higher adsorption of the methyl orange dye to the cotton fabric during the dyeing process leads to less wastewater pollution after dyeing with unfixed dye and, thus, a reduction in wastewater treatment costs.

Ag Nanoparticles Deposited onto BaTiO3 Aerogel for Highly Efficient Photodegradation

“…The enhanced adsorption of dye molecules by noble metals can be attributed to the potential alteration in the electronic state of the substrate resulting from the deposition of noble metal nanoparticles on its surface [ 23 ]. In acidic media of pH below 6.5, BaTiO 3 surfaces are positively charged, while MO is negatively charged [ 38 , 39 ]. Due to the strong electrostatic attraction between these charged species, the facile adsorption of MO on the surface of BaTiO 3 can be observed.…”

Fibrous Structures: An Overview of Their Responsiveness to External Stimuli towards Intended Application

“…The primary categories of commercially significant pH-sensitive dyes include phthalides, triarylmethanes, and fluoranes [148]. Methyl yellow, bromothymol blue [149], methyl orange [150], phenol red [151] and bromocresol purple [152] are some examples of halochromic synthetic dyes.…”

Designing and Producing pH Sensitive Warning Clothes with different Fabric Constructions using Chromic Materials

“…[2][3][4] An emerging trend in the field of smart textiles is the use of color-changing materials, often known as chameleon textiles or (chromic textiles), which may change color in response to a variety of external stimuli. [1,5] Thermochromism (induced by temperature), photochromism (induced by light), halochromism (induced by pH), [6] electrochromism (induced by electricity), solvatochromism (induced by the polarity of solvent), etc. are different types of chromism (chromic material) depending on the nature of the stimulus.…”

“…The fact that these materials can be applied to textiles in a variety of straightforward and flexible ways, where the color change is instantly apparent to everyone and may thus be utilized as a first, ondestructive warning signal, makes them incredibly important in warning fabrics. [5] According to this, the number of studies devoted to chromic materials has dramatically increased in recent years due to the development of wearable sensors. [8] For instance, incorporating sensing capabilities into textiles can have a positive impact on a variety of industries, including sports performance, military applications, lab coats, and the healthcare sector.…”