Photo‐switchable spiropyran immobilized polystyrene beads using catechol chemistry

Abstract

Catechol and spiropyran functional groups were conjugated to a polymer backbone, allowing immobilization on polystyrene beads (PS beads). The final product was capable of stably reproducing the optical properties of spiropyran. Through the outstanding surface adhesion properties of the catechol functional group, spiropyran was immobilized on PS beads. Switchable photoluminescence in the spiropyran coated PS bead surfaces was observed depending on irradiation with either UV or visible light. The surfaces of the PS beads were morphologically examined by field emission scanning electron microscopy and X-ray photoelectron spectroscopy was used for characterization of the constituent atoms. Furthermore, UV-Vis and fluorescence spectroscopy were used to confirm conversion between the spiropyran (SP) and merocyanine (MC) forms through UV or visible light irradiation on SP, while fluorescent images for both SP and MC were studied using confocal laser scanning microscopy. The confocal images of the SP-PS beads system onto MDAMB-231 cells under UV and visible light indicate the cellular uptake by emerging color within the cytoplasm. Advancing study, the remaining catechol groups can confers adhesive properties, given by contact angle data of various coated surfaces film. These stimuli-responsive coatings are compatible as drawing switchable photochromic material on versatile substrate shown in confocal images of propylene film. Overall, this great water solubility and biocompatibility PS beads system also showed potential as cell bio-imaging light stimuli responsive material, and the benefits of this system can also possibly address coat able advanced material for a wide range of surface light sensor applications.

3D Plasmonic Gold Nanopocket Structure for SERS Machine Learning‐Based Microplastic Detection

“…[ 48 ] In the case of the PS particles dispersed in water, a continuous absorbance decrease from visible to NIR region is observed. [ 49 ] Interestingly, when the PS particles were captured by the 3D‐PGNP surface, a new absorbance spectral feature was observed, including peaks at 520, 570, and 690 nm, which are considered to be derived from close‐packed or multistacked PS particles in the 3D‐PGNP. [ 50 ] The improved absorbance around the NIR region in the presence of PS is acceptable for additional resonance effect, which is closely related to the wavelength match of a laser beam and electronic transition wavelength of targets.…”

Preparation of poly(methyl methacrylate) photochromic microcapsules containing spiro-pyran by solvent volatilization

“…Spiro-pyran is prone to ring-opening reactions under UV excitation, and it is susceptible to photodegradation due to external influences and consumption [6]. The problem that needs to be solved for spiro-pyran is to improve its colorchanging properties and resistance to low fatigue [7]. One solution is to encapsulate the photochromic dyes in microcapsules of micro-nano composite particles, which can improve the applicability of photochromic materials and improve their fatigue resistance [8].Si [9] et al used spiro-pyran compound as the core material and chitosan as the shell material, and prepared intelligent photochromic chitosan microcapsules through emulsification and chemical crosslinking technology.…”

Preparation of reversible photoresponsive N-hydroxyethyl spiropyran/polyacrylonitrile fiber materials with mechanical stability by electrospinning for regulating wettability and humidity automatically

“…[20][21][22] Recently, spiropyran and its derivatives have been widely researched for preparing light-induced materials. 23,24 As typical photoisomerized compounds with controllable polarity, [25][26][27][28][29] they have many advantages in terms of the capabilities of chemical modification and reaction diversity. Therefore, spiropyran and its derivatives can provide an abundant source for the fabrication of photoresponsive materials with controllable wettability.…”