Photochromic properties of stimuli-responsive cellulosic papers modified by spiropyran-acrylic copolymer in reusable pH-sensors

Rewritable Optical Patterns in Light-Responsive Ultrahigh Molecular Weight Polyethylene

“…The coloration kinetics of the SP to MC isomerization can be described (Figure 4B) using a first-order exponential fit, having rate constants on the order of ∼−0.015 s –1 . 36,37 These values are comparable to rate constants found in poly(methyl methacrylate) matrixes. 38 In addition, decoloration kinetics in response to green light (λ = 565 nm) or heat (70 °C) can also be fitted using a first order exponential fit, revealing a faster thermal decoloration reaction (Figures S2a,b and S3).…”

Functional Polymers and Polymer–Dye Composites for Food Sensing

“…In the past decades, the use of polymer‐dye composites as a design platform of food sensors has attracted great interest, since this methodology is relatively easy to implement and scale‐up. [ 42,45–54 ] In general, this type of sensor could be fabricated through immobilization of dyes into a polymer matrix through either physical blending or covalent chemical bonding. Compared to covalent bonding, the physical blending often encounters the problem of dye leaching from the polymer matrix, which may lead to decreased sensing sensitivity and potential food contamination.…”

Chemically stable fluorescent anti-counterfeiting labels achieved by UV-induced photolysis of nanocellulose

“…The inks that are integrated with the substrates via hydrogen bonding and physical adsorption could be easily removed by solvent, depending on the solubility of the ink in the solvent. 18,19 The information displayed by uorescent inks is at risk of being erased. To solve the issues, it is necessary to design a new strategy of uorescent patterning technique that must satisfy the following criteria: (i) the print substrate itself can act as ink materials (i.e., information carrier); (ii) it has to be environment-friendly, cheap and easy to obtain; (iii) it has to possess excellent chemical stability under various conditions, e.g., under acidic, alkaline, reducing and oxidizing environments.…”