Self‐Regulating Contact Lenses with the Patterning of a Photochromic Layer Based on Wettability Contrast

Kim, Se‐Um; Lee, Sang Hyun; Kim, Kitae; Na, Jun‐Hee

doi:10.1002/admi.202001443

Cited by 6 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6] In particular, light can be applied in a noninvasive manner because of its distinct advantages of cleanness, quickness and safety. [7][8][9][10][11] Azobenzene and its derivatives, widely used photochromes, are known for their reversible trans-cis isomerization upon UV or visible light irradiation. The photoresponsiveness leads to various switchable characteristics, such as glass-transition temperature, color, and hydrophobicity, which thus shows broad applications in self-healing, erasable surface, and self-cleaning, etc.…”

Section: Introductionmentioning

confidence: 99%

Photoresponsive Superhydrophobic Membrane Crosslinked by Bipedal Pillararenes with Patterned Wettability

Dong

Wang

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

Electrospraying is a physical process used for the production of nano-to microparticles membranes from polymer liquid atomization using electrical forces. [23][24][25] It has been well documented that relative humidity (RH) has a great impact on the porosity of the obtained particles during the electrospraying process. [26,27] Therefore, it is a smart way to craft a membrane with hierarchical structures by using supramolecules, for instance, polypseudorotaxane (PPR), via integrating electrospraying with breath figure approach (where breath figure method is a facile fabrication process of porous films because of the formation of the water droplet array when water vapor contacts a cold substrate). [12,[28][29][30][31] PPR represents the linear guest molecules encircled by host molecules via hostguest interaction. [32][33][34] Functional or multipedal host molecules have been used to generate guest molecules, such as traditional covalent polymers, with unique physical characteristics or form a distinct class of crosslinked supramolecule as well as supramolecular organic framework (SOF). [34][35][36][37][38][39] Here, we report a crosslinked PPR based on the selective recognition of dimethoxypillar[5]arene (DMP5A) on an azobenzene-containing host molecule, i.e., DMP5A-Azobenzene-DMP5A (P5-Azo-P5) to the PCL block of PCL-b-PEG-b-PCL, which provides a simple strategy to functionalize traditional covalent polymers. Then the PPR was used to fabricate a crosslinked supramolecular membrane by electrospraying under 50% RH and 90% RH (denoted CSM-50 and CSM-90), respectively. CSM-50 and CSM-90 displayed significantly different wettability. The force-distance test measuring the adhesion of membrane revealed that the average value of water adhesion force of CSM-50 was over five times bigger than that of CSM-90, which resulted from the dramatic variation of the external and internal nanostructures. The water droplet could be stuck to the inverted CSM-50 for trace liquid transportation while it could roll randomly on the surface of CSM-90 for self-cleaning purpose. In addition, owing to the reversible trans-cis isomerization of azobenzene, CSM-90 underwent rapid increase of water adhesion force and color conversion in response to UV irradiation. These rules provide us the capability to design the wettability of CSM-90 in the vertical and horizontal directions dissimilarly via re-electrospraying under 50% RH or UV light irradiation with patterned photomask.

show abstract

Section: Introductionmentioning

confidence: 99%

Photoresponsive Superhydrophobic Membrane Crosslinked by Bipedal Pillararenes with Patterned Wettability

Dong

Wang

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

42‐2: Self‐Scalable UV Blocking Artificial Iris Operated by Radially Controlled Crosslinking Density with Fast Switching Dynamics

Cho,

Nauman,

Lee

et al. 2024

Symp Digest of Tech Papers

View full text Add to dashboard Cite

In the anatomy of human eye, the role of iris is crucial since it controls the light level entering the eye and enhances the visibility. Here, we propose a soft contact lens type artificial iris actuated by eternal UV (ultra‐violet) light source, self‐regulating its effective aperture size by varying the crosslinking density of bio‐compatible polymer matrix doped with photochromic dye. For its self‐regulating characteristic, we cured HEMA‐based polymer matrix gradually from center to edge. Since the polymer matrix is polymerized by heat, we utilized NIR (near infra‐red) lamp and gradient grayscale patterned photomask for its gradual characteristic. Thereby, the crosslinking density of central position is higher compared to that of peripheral, causing slow switching dynamics. The gradient difference in switching dynamics leads to artificial iris gaining self‐regulation dynamics of effective aperture. The manufactured artificial iris shows advantage in blocking UV light, self‐regulating, and fast switching dynamics. The switching dynamics of artificial iris under bright and dim light adaptation are less than 50 seconds and 120 seconds, showing similar property with human iris.

show abstract

Preparation of Photoresponsive PAN-NH2@EPESP Fiber Films with Mechanical Stability for Regulating Wettability and Micro-environment Humidity

Cao

Wang

et al. 2021

Chem. Res. Chin. Univ.

View full text Add to dashboard Cite

Self‐Regulating Contact Lenses with the Patterning of a Photochromic Layer Based on Wettability Contrast

Cited by 6 publications

References 39 publications

Photoresponsive Superhydrophobic Membrane Crosslinked by Bipedal Pillararenes with Patterned Wettability

Photoresponsive Superhydrophobic Membrane Crosslinked by Bipedal Pillararenes with Patterned Wettability

42‐2: Self‐Scalable UV Blocking Artificial Iris Operated by Radially Controlled Crosslinking Density with Fast Switching Dynamics

Preparation of Photoresponsive PAN-NH2@EPESP Fiber Films with Mechanical Stability for Regulating Wettability and Micro-environment Humidity

Contact Info

Product

Resources

About