The development of halochromic textile materials could lead to interesting end-use applications as it offers the potential for flexible pH-sensors with a first warning signal. \cf2 During the healing process of a wound, the pH-value of the skin varies. The progress of the healing process could thus be indicated by a pH-sensitive wound dressing which may avoid unnecessary removal of the dressing.\cf0 In the last decade smart textiles have become the subject of many studies all over the world. Within the group of smart textiles, a growing interest in color change materials, or so called chameleon textiles, is recognized. Furthermore, when covering large surfaces, they are capable of giving a local signal by a local color change and this without having to incorporate many separate local sensor systems. Halochromic textiles, which vary in colour depending on the pH, offer major potentials since a whole range of processes in nature are affected by this parameter.
The dyes are generally incorporated in the textile structures by sol-gel coating, extrusion or microencapsulation. Besides these traditional textile materials, also nanofibrous nonwovens will be incorporated with the dyes as the typical characteristics of nanofibres (such as high surface area, small pore size) may provide benefits in various medical applications. Nanofibrous, nonwovens can be coloured by a direct incorporation of the dyes in the polymer solution before the electrospinning process. Wound Healing color change: Red - Yellow- Green

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