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Статті в журналах з теми "Halochromic textile"

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Автор: Grafiati

Опубліковано: 14 березня 2023

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Van der Schueren, Lien, and Karen de Clerck. "Halochromic Textile Materials as Innovative pH-Sensors." Advances in Science and Technology 80 (September 2012): 47–52. http://dx.doi.org/10.4028/www.scientific.net/ast.80.47.

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Анотація:

Recently, an increasing interest in pH-sensitive textiles is recognized. These chromic textiles can be used as flexible sensors for various applications. The aim of the current research is to develop textile pH-sensors through the application of pH-sensitive dyes on various textile materials using different techniques. The results of our study show that halochromic dyes can be incorporated into conventional textiles by a conventional dyeing technique. Also coating the fabrics with a sol-gel layer containing the halochromic dye proved to be successful. The majority of these developed materials showed a clearly visible color change with a pH-variation. The response of the sensors was dependent on the density of the fabric but was generally relatively fast, especially for the sol-gel treated fabrics. The halochromic coloration of nanofibres was realized by directly adding the dyes during the fiber formation, which was shown to be highly effective. Again, a clear halochromic shift was observed. The response of these sensors was fast thanks to the high porosity of nanofibrous non-wovens. Yet, it should be kept in mind that the halochromic behavior of the dyes in the textile matrix altered compared to their behavior in solution which is most likely attributed to dye-fiber interactions. Generally we can conclude that various coloration techniques showed to be effective for the development of innovative textile pH-sensors.

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Trovato, Valentina, Silvia Sfameni, Giulia Rando, Giuseppe Rosace, Sebania Libertino, Ada Ferri, and Maria Rosaria Plutino. "A Review of Stimuli-Responsive Smart Materials for Wearable Technology in Healthcare: Retrospective, Perspective, and Prospective." Molecules 27, no. 17 (September 5, 2022): 5709. http://dx.doi.org/10.3390/molecules27175709.

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In recent years thanks to the Internet of Things (IoT), the demand for the development of miniaturized and wearable sensors has skyrocketed. Among them, novel sensors for wearable medical devices are mostly needed. The aim of this review is to summarize the advancements in this field from current points of view, focusing on sensors embedded into textile fabrics. Indeed, they are portable, lightweight, and the best candidates for monitoring biometric parameters. The possibility of integrating chemical sensors into textiles has opened new markets in smart clothing. Many examples of these systems are represented by color-changing materials due to their capability of altering optical properties, including absorption, reflectance, and scattering, in response to different external stimuli (temperature, humidity, pH, or chemicals). With the goal of smart health monitoring, nanosized sol–gel precursors, bringing coupling agents into their chemical structure, were used to modify halochromic dyestuffs, both minimizing leaching from the treated surfaces and increasing photostability for the development of stimuli-responsive sensors. The literature about the sensing properties of functionalized halochromic azo dyestuffs applied to textile fabrics is reviewed to understand their potential for achieving remote monitoring of health parameters. Finally, challenges and future perspectives are discussed to envisage the developed strategies for the next generation of functionalized halochromic dyestuffs with biocompatible and real-time stimuli-responsive capabilities.

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Rahman, Mustafijur, Mohammad Abbas Uddin, Md Moynul Hassan Shibly, Nusrat Binta Hossain, Mohammad Forhad Hossain, and Muriel Rigout. "Synthesis and Characterisation of Azo-Based Dichlorotriazine Reactive Dye with Halochromic Behaviour." TEKSTILEC 64, no. 3 (October 26, 2021): 247–59. http://dx.doi.org/10.14502/tekstilec2021.64.247-259.

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Анотація:

Halochromism or pH sensitivity has tremendous potential for applications in various textile fields, such as protective clothing, wound dressings, etc. Reactive dye is mostly used to colour cotton or other regenerated cellulose fibres due to its better fastness and wide range of hue, from vivid to dull shades. In this research work, an azo-based dichlorotriazine reactive dye was synthesised from H-acid (4-amino-5-hydroxy-2,7-naphthalen¬edisulfonic acid) and 4-nitroaniline, which incorporates a halochromic behaviour. The change of colour of this dye was evaluated both in the the solution stage and coloured fabric stage in various pH solutions. A visible change of colour with the alteration of pH was observed after dyeing textile fabric with the synthesised dye. However, a significant difference was observed in a few cases with regard to the change of colour with the alteration of pH in the solution stage and coloured fabric stage. The dyed fabric also displayed very good to excellent wash fastness properties. Generally, the reactive dye synthesised in this research demonstrated an obvious change of colour with the alteration of the pH level.

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Park, Young Ki, Hyun Ju Oh, Jong Hyuk Bae, Jee Young Lim, Hee Dong Lee, Seok Il Hong, Hyun Sik Son, Jong H. Kim, Seung Ju Lim, and Woosung Lee. "Colorimetric Textile Sensor for the Simultaneous Detection of NH3 and HCl Gases." Polymers 12, no. 11 (November 4, 2020): 2595. http://dx.doi.org/10.3390/polym12112595.

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For the immediate detection of strong gaseous alkalis and acids, colorimetric textile sensors based on halochromic dyes are highly valuable for monitoring gas leakages. To date, colorimetric textile sensors for dual-gas detection have usually been fabricated by electrospinning methods. Although nanofibrous sensors have excellent pH sensitivity, they are difficult to use commercially because of their low durability, low productivity, and high production costs. In this study, we introduce novel textile sensors with high pH sensitivity and durability via a facile and low-cost screen-printing method. To fabricate these textiles sensors, Dye 3 and RhYK dyes were both incorporated into a polyester fabric. The fabricated sensors exhibited high detection rates (<10 s) and distinctive color changes under alkaline or acidic conditions, even at low gas concentrations. Furthermore, the fabricated sensors showed an outstanding durability and reversibility after washing and drying and were confirmed to contain limited amounts of hazardous materials. Thus, our results show that the fabricated textile sensors could be used in safety apparel that changes its color in the presence of harmful gases.

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Trovato, Valentina, Alessio Mezzi, Marco Brucale, Hamed Abdeh, Dario Drommi, Giuseppe Rosace, and Maria Rosaria Plutino. "Sol-Gel Assisted Immobilization of Alizarin Red S on Polyester Fabrics for Developing Stimuli-Responsive Wearable Sensors." Polymers 14, no. 14 (July 8, 2022): 2788. http://dx.doi.org/10.3390/polym14142788.

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In the field of stimuli-responsive materials, introducing a pH-sensitive dyestuff onto textile fabrics is a promising approach for the development of wearable sensors. In this paper, the alizarin red S dyestuff bonded with a sol-gel precursor, namely trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane, was used to functionalize polyethylene terephthalate fabrics, a semi-crystalline thermoplastic polyester largely used in the healthcare sector mainly due to its advantages, including mechanical strength, biocompatibility and resistance against abrasion and chemicals. The obtained hybrid halochromic silane-based coating on polyester fabrics was investigated with several chemical characterization techniques. Fourier transform infrared spectroscopy and X-ray Photoelectron Spectroscopy confirmed the immobilization of the dyestuff-based silane matrix onto polyethylene terephthalate samples through self-condensation of hydrolyzed silanols under the curing process. The reversibility and repeatability of pH-sensing properties of treated polyester fabrics in the pH range 2.0–8.0 were confirmed with diffuse reflectance and CIELAB color space characterizations. Polyester fabric functionalized with halochromic silane-based coating shows the durability of halochromic properties conversely to fabric treated with plain alizarin red S, thus highlighting the potentiality of the sol-gel approach in developing durable halochromic coating on synthetic substrates. The developed wearable pH-meter device could find applications as a non-invasive pH sensor for wellness and healthcare fields.

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Kusimo, Michael O., Henry Ukoha, Aderonke Oludare, Oluwatoyin Afolabi, and Matthew Agwae. "Halochromic properties and antimicrobial potential of crude extracts from five species of ornamental plants." UNED Research Journal 11, no. 3 (December 1, 2019): 283–91. http://dx.doi.org/10.22458/urj.v11i3.2586.

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Introduction: the colours of flowers are a result of secondary metabolites that have long been used in the medical and textile industries, and those that are halochromic are used in colour display because they change color according to pH changes, but many species are yet to be studied in detail. Objective: to explore the halochromic properties and the antimicrobial potentials of the crude extracts of several ornamental plants. Methods: we used aqueous and organic solvents to extract pigments from petals of five fascinating flowers planted around International Institute of Tropical Agriculture station, Cotonou, Benin: Allamanda blanchetii, Cascabela thevetia, Eichhornia crassipes, Ixora casei and Thunbergia erecta, followed by an investigation into their halochromic properties. Antibacterial potentials of the extracts were tested on important rice pathogens: Xanthomonas oryzae pv. oryzae, and Pantoea agglomerans, which are gram-negative bacteria; and on Bacillus subtilis, a gram-positive bacterium. Results: The crude extracts of T. erecta and A. blanchetii have good halochromic properties within pH 2 – 12, exhibiting distinct colours. The chromophores of the C. thevetia, E. crassipes, and I. casei are not halochromic as the colours of the crude extracts remain the same at the pH range except pH 12 which is similar for the five extracts. Crude extracts of T. erecta inhibited growth of P. agglomerans without development of resistance, whereas the bacteria developed resistance against Penicillin after 18 hrs of incubation. T. erecta and A. blanchetii were able to inhibit growth of X. oryzae and both inhibited B. subtilis. Conclusion: Pigments from both T. erecta and A. blanchetii are good pH indicators; however, T. erecta is a better antibacterial agent than A. blanchetii because it has broad-spectrum activities against bacteria.

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Park, Young Ki, Byeong M. Oh, A. Ra Jo, Ji Hyeon Han, Jee Young Lim, Hyun Ju Oh, Seung Ju Lim, Jong H. Kim, and Woo Sung Lee. "Fabrication of Colorimetric Textile Sensor Based on Rhodamine Dye for Acidic Gas Detection." Polymers 12, no. 2 (February 12, 2020): 431. http://dx.doi.org/10.3390/polym12020431.

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For the immediate detection of gaseous strong acids, it is advantageous to employ colorimetric textile sensors based on halochromic dyes. Thus, a rhodamine dye with superior pH sensitivity and high thermal stability was synthesized and incorporated in nylon 6 and polyester fabrics to fabricate textile sensors through dyeing and printing methods. The spectral properties and solubility of the dye were examined; sensitivity to acidic gas as well as durability and reversibility of the fabricated textile sensors were investigated. Both dyed and printed sensors exhibited a high reaction rate and distinctive color change under the acidic condition owing to the high pH sensitivity of the dye. In addition, both sensors have outstanding durability and reversibility after washing and drying.

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De Meyer, Thierry, Iline Steyaert, Karen Hemelsoet, Richard Hoogenboom, Veronique Van Speybroeck, and Karen De Clerck. "Halochromic properties of sulfonphthaleine dyes in a textile environment: The influence of substituents." Dyes and Pigments 124 (January 2016): 249–57. http://dx.doi.org/10.1016/j.dyepig.2015.09.007.

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Kramar, Ana D., Tatjana R. Ilic-Tomic, Jelena M. Lađarević, Jasmina B. Nikodinovic-Runic, and Mirjana M. Kostic. "Halochromic cellulose textile obtained via dyeing with biocolorant isolated from Streptomyces sp. strain NP4." Cellulose 28, no. 13 (July 15, 2021): 8771–84. http://dx.doi.org/10.1007/s10570-021-04071-7.

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Lee, Junheon, Heejung Jun, Yasuhiro Kubota, and Taekyeong Kim. "Synthesis of red fluorescent dye with acid gas sensitive optical properties and fabrication of a washable and wearable textile sensor." Textile Research Journal 91, no. 17-18 (February 16, 2021): 2036–52. http://dx.doi.org/10.1177/0040517521994496.

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Two halochromic red fluorescent dyes, whose chromophores are the same as Nile red, were synthesized by introducing dibutyl- and dihexyl-substituents for improving their affinity toward chemically resistant and hydrophobic fibers made of high molecular weight polyethylene. The optical properties of the two synthesized dyes (Dibutyl NR, Dihexyl NR) compared with Ethyl NR (Nile red), such as the maximum absorption, Stokes shift, molar absorption coefficient, and quantum yield, were almost the same. However, the most hydrophobic Dihexyl NR exhibited the best washability of the three dyes. It was shown that the change of both the color and the fluorescence emission properties can be achieved not only in a hydrochloric acid solution but also inside the polyethylenic fiber on exposure to the gaseous phase of hydrogen chloride even at very low concentrations. The sensing performance was maintained even after several repeats. The highly sensitive and visible fluorescent acid gas sensing textile sensor having washability and reusability was fabricated.

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Stojkoski, Viktor, and Mateja Kert. "Design of pH Responsive Textile as a Sensor Material for Acid Rain." Polymers 12, no. 10 (September 30, 2020): 2251. http://dx.doi.org/10.3390/polym12102251.

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The chemical composition of rainwater can serve as an indicator of the excess of acidifying air pollutants. The pH value of rainwater in the presence of sulphur dioxide and nitrogen oxides, the precursors of acid rain, falls below pH 5.6, which is the limit value for acid rain. In this research, the tailoring of halochromic textile was examined for the design of a functional textile that can serve as a sensor and inform the wearer about the presence of pollutants in the air by means of an immediate colour change. For this purpose, a polyamide 6 fabric was dyed with the pH-sensitive Bromocresol green dye, which causes a colour change below pH 3.6 (yellow) and above pH 5.4 (blue). In addition, the dyed polyamide 6 fabric was treated with a water and oil repellent finish. Colour and colour change before and after immersion of unfinished and finished dyed samples in buffer solutions with different pH values were evaluated spectrophotometrically using the CIELAB colour space. The colour fastness to rubbing, washing, and light, and the water and oil repellency of the dyed fabrics were determined according to valid SIST EN ISO standards. The results showed that the unfinished dyed polyamide 6 fabric undergoes a reversible colour change faster and more clearly than the finished dyed polyamide 6 fabric. The dyed polyamide 6 fabric had good colour fastness to rubbing and domestic and commercial laundering, while the colour fastness to light was poor. In addition, the dyed polyamide 6 fabric was pH-sensitive, despite dye degradation under xenon light, regardless of whether it was finished.

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Van der Schueren, Lien, Karen De Clerck, Giovanna Brancatelli, Giuseppe Rosace, Els Van Damme, and Winnok De Vos. "Novel cellulose and polyamide halochromic textile sensors based on the encapsulation of Methyl Red into a sol–gel matrix." Sensors and Actuators B: Chemical 162, no. 1 (February 2012): 27–34. http://dx.doi.org/10.1016/j.snb.2011.11.077.

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Lim, Taekyung, Jeong Hui Lee, Keun-Hyeok Yang, Sanghyun Ju, and Sang-Mi Jeong. "Highly elastic halochromic fibers capable of reversible sensing of acidic/basic vapor for use in wearable textiles." AIP Advances 12, no. 10 (October 1, 2022): 105011. http://dx.doi.org/10.1063/5.0112751.

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Halochromic sensors, which allow users to visually recognize exposure to acid/base chemicals that are harmful to the human body, are routinely used in a wide range of industries, such as pharmaceuticals, biotechnology, cosmetics, and environmental/human monitoring systems. In this study, halochromic fibers that operate stably, even when exposed to rain or sweat and repeated stretching–releasing, were investigated. While the halochromic mesoporous silica was synthesized using tetraethylorthosilicate and cetyltrimethylammonium bromide, methyl yellow (MY) and bromothymol blue (BTB) as halochromic dyes were added so that MY and BTB were chemically or physically immobilized on the siloxane network structure of the halochromic mesoporous silica. Using the swelling and shrinking properties of the polymer, the halochromic mesoporous silica was embedded in a highly elastic spandex fiber composed of multiple strands. Because of the strong ionic and hydrogen bonding between the dye and the silica matrix, the dyes can be immobilized even in an aqueous solution without the leaching of the dyes. The stretchable halochromic fiber reversibly changed its color even after repeated exposure to acidic/basic conditions five times and could sense acid/base concentrations in the range of 0.5–10 wt %. In addition, because the halochromic mesoporous silica is tightly adhered between the stands of spandex fibers, stable color conversion properties were maintained even after stretching to 150% of the fibers and repeated 100 times. Because the halochromic fiber can be applied to lab coats, work clothes, and gloves, it is expected to be used as a wearable colorimetric sensor for daily life and industrial applications.

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Lee, Junheon, and Taekyeong Kim. "Synthesis of novel coumarin-based acid vapochromic fluorescence dye showing change of both color and fluorescence emission spectrum for application to sensitive, reusable, and washable textile sensors." Textile Research Journal, September 9, 2020, 004051752095523. http://dx.doi.org/10.1177/0040517520955232.

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A new coumarin-based fluorescence dye, which simultaneously changes the fluorescence behavior as well as color by exposure to an acid-gas, was synthesized by modifying the dye structure so as to produce relatively long alkyl groups. The newly synthesized halochromic fluorescence dye was applied to polyethylenic fibers, such as high molecular weight polyethylene. The acid-gas sensing was functionalized not only in the solution state but also inside a matrix. A textile sensor was subsequently fabricated in this study and showed visible changes to both color and fluorescence emission properties as well as sensitivity to changes under low concentrations of gas-phase hydrogen chloride. Further, the sensing performance was sustainable and repeatable. From the washability test, it was observed that the dye did not leach out completely.

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DeRosa, Christopher A., and Garrett Wilkins. "Steric-Induced Fluorescence via Methyl Substitution in Chalcone Dyes." Proceedings of the West Virginia Academy of Science 90, no. 1 (April 2, 2018). http://dx.doi.org/10.55632/pwvas.v90i1.378.

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Chemical research of luminescent dyes can have potential benefits in cell microscopy, optoelectronics and textiles. Luminescent chalcones have been studied extensively for their florescence properties and sensing capabilities, such as halochromism (pH), solvatochromism (polarity), and viscochromism (viscosity). Properties such as viscochromism can be utilized to sense the membrane viscosity in cells. To probe the viscochromic behavior of chalcones, bulky methyl-substituents were incorporated into the design of the chalcone to probe planarity, brightness and fluorescence turn-on based of environmental viscosity. This was achieved via Aldol condensation of aromatic ketones and para-(dimethylamino) benzaldehyde to incorporate a bulky methyl groups at an aromatic or vinyl positions. Synthesis of the derivatives was confirmed by 1H NMR, TLC and IR spectroscopy. Preliminary results indicate the dyes have yellow-green florescence in dichromomethane (Q.Y. ~12%), and aggregation induced emission (AIE) properties. This presentation will discuss the optical properties in solution, future directions and possible applications.

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