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Authors = Inês Boticas

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15 pages, 4047 KiB  
Article
Halochromic Textiles for Real-Time Sensing of Hazardous Chemicals and Personal Protection
by Liliana Leite, Vânia Pais, Cristina Silva, Inês Boticas, João Bessa, Fernando Cunha, Cátia Relvas, Noel Ferreira and Raul Fangueiro
Materials 2023, 16(8), 2938; https://doi.org/10.3390/ma16082938 - 7 Apr 2023
Cited by 5 | Viewed by 3097
Abstract
Chemical protective clothing (CPC) has become mandatory when performing various tasks to ensure user protection and prevent chemicals from contacting the skin and causing severe injuries. In addition to protection, there is a need to develop a simple mechanism that can be attached [...] Read more.
Chemical protective clothing (CPC) has become mandatory when performing various tasks to ensure user protection and prevent chemicals from contacting the skin and causing severe injuries. In addition to protection, there is a need to develop a simple mechanism that can be attached to CPC and be capable of detecting and alerting the user to the presence of harmful chemical agents. In this study, a double-sensor strategy was investigated, using six different pH indicators stamped on cotton and polyester knits to detect acidic and alkaline substances, both liquid and gaseous. Functionalized knits underwent microscopic characterization, air permeability and contact angle evaluation. All samples exhibited hydrophobic behavior (contact angle > 90°) and air permeability values above 2400 L/min/cm2/bar, with the best condition demonstrating a contact angle of 123° and an air permeability of 2412.5 L/min/cm2/bar when the sensor methyl orange and bromocresol purple (MO:BP) was stamped on polyester. The performed tests proved the functionality of the sensors and showed a visible response of all knits when contacting with different chemicals (acids and bases). Polyester functionalized with MO:BP showed the greatest potential, due to its preeminent color change. Herein, the fiber coating process was optimized, enabling the industrial application of the sensors via a stamping method, an alternative to other time- and resource-consuming techniques. Full article
(This article belongs to the Special Issue Advanced and Bio-Based Materials)
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15 pages, 10896 KiB  
Article
Halochromic Inks Applied on Cardboard for Food Spoilage Monitorization
by Liliana Leite, Inês Boticas, Miguel Navarro, Luís Nobre, João Bessa, Fernando Cunha, Pedro Neves and Raúl Fangueiro
Materials 2022, 15(18), 6431; https://doi.org/10.3390/ma15186431 - 16 Sep 2022
Cited by 1 | Viewed by 2797
Abstract
Control of food spoilage is a critical concern in the current world scenario, not only to ensure the quality and safety of food but also to avoid the generation of food waste. This paper evaluates a dual-sensor strategy using six different pH indicators [...] Read more.
Control of food spoilage is a critical concern in the current world scenario, not only to ensure the quality and safety of food but also to avoid the generation of food waste. This paper evaluates a dual-sensor strategy using six different pH indicators stamped on cardboard for the detection of spoilage in three different foods: beef, salmon, and strawberries. After function validation and formulation optimizations in the laboratory, the halochromic sensors methyl orange and bromocresol purple 2% (w/v) were stamped on cardboard and, in contact with the previously mentioned foods, were able to produce an easily perceptible signal for spoilage by changing color. Additionally, when it comes to mechanical characterization the inks showed high abrasion (>100 cycles) and adhesion resistance (>91%). Full article
(This article belongs to the Special Issue Recent Studies of Additives and Materials for Smart Packaging Applications)
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2 pages, 412 KiB  
Abstract
Temperature-Sensing Inks for Real-Time Monitoring in Food Packaging
by Liliana Leite, Luís Nobre, Inês Boticas, Miguel Navarro, João Bessa, Fernando Cunha, Pedro Neves and Raúl Fangueiro
Mater. Proc. 2022, 8(1), 130; https://doi.org/10.3390/materproc2022008130 - 12 Jul 2022
Cited by 1 | Viewed by 1951
Abstract
Temperature is a preponderant factor in the packaging sector [...] Full article
(This article belongs to the Proceedings of MATERIAIS 2022)
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