Dye immobilization in halochromic nanofibers through blend electrospinning of a dye-containing copolymer and polyamide-6

Abstract

Halochromic polyamide6-based fabrics with drastically reduced dye-leaching through blend electrospinning of PA6 with dye-functionalized copolymer.

Acidity Constant (pKa) Calculation of Large Solvated Dye Molecules: Evaluation of Two Advanced Molecular Dynamics Methods

“…Our specific interest in calculating p K a values arises from the development of novel sensor materials: halochromic (pH‐sensitive) dyes can be incorporated into polymeric structures to give pH‐sensitive polymers that can be used in wound bandages, protective clothing, and so on . In recent developments, these dye molecules were modified to include reactive or polymerizable groups . This resulted in a material for which the dye was covalently bound to the host material, which greatly improved the leaching properties.…”

“…[1][2][3][4][5][6][7][8][9][10] In recent developments,t hese dye molecules were modified to include reactive or polymerizable groups. [11] This resulted in am aterial for which the dye was covalently bound to the host material, which greatly improved the leaching properties. This modification, however,c hanged the molecular structure of the dye and therefore also its halochromic properties.F or ap H-sensitive wound bandage, for example, ap K a around 6.5-7.0 would be ideal.…”

Blend electrospinning of dye-functionalized chitosan and poly(ε-caprolactone): towards biocompatible pH-sensors

“…A smart halochromic sensor can be designed by incorporating the halochromic dye into a specific matrix with a desired structure, resulting in a custom material that signals pH-changes through a fast and simple change of color. 4,5 Such chromic materials play an important role in user-friendly products, providing clear information in a non-destructive way. One of the areas where halochromic sensors could be of great use, is the biomedical field.…”

“…However, previous studies have shown that the dye tends to leach out of such dyedoped nanofibers in the presence of moist, as it is only physically entrapped inside the nanofiber structure. 4,7,21,[24][25][26] Dye-immobilization is, thus, currently a major challenge in nanofibrous sensor design. Extensive research on immobilization of pH-indicator dyes has shown that the use of a covalent linkage between dye and polymer matrix is the most efficient manner to inhibit dye-migration.…”

Ready-to-use strip for l-ascorbic acid visual detection based on polyaniline/polyamide 66 nano-fibers/nets membranes

“…We describe that high solvent evaporation rates and fast phase separations can induce nanoweb formation in our previous work [32]. Electrospinning/netting a polymer blend in the vapor-poor atmosphere of start-up phase of the process could render the system more sensitive to phase separation, possibly explaining the high cover range of nanonets [33,34].…”