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Supplementary material from "Bio-interfacial engineering of electrophoretic coacervate microcapsules for cytocompatible on-skin displays"
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Scientists created a new type of "e-ink" display—like the screens on e-readers—using natural, skin-friendly materials (from plants and gelatin) instead of the hard plastic capsules and irritating chemicals found in current versions. In lab tests, this new material caused much less skin irritation and cell damage while still working as a fast, writable digital display, suggesting it could pave the way for wearable tech that's safer for direct, long-term skin contact.
Electrophoretic ink (e-ink) holds significant potential for energy-efficient displays and sustainable alternatives to print media. However, their use in wearables is hindered by hazardous materials which are cytotoxic and sensitizing to human tissue. While commercial e-inks encapsulate these fluids in rigid, synthetic microplastics, such as melamine-formaldehyde, they lack the mechanical conformability and environmental safety required for epidermal contact. We thus present a novel approach for producing e-ink microcapsules (EIMCs) for integration into biocompatible and free-form digital devices. Spherical, core–shell EIMCs were fabricated via complex coacervation (pH 4.1), using user-friendly biopolymers (gum acacia and gelatine). A core of white electrophoretic TiO2 particles (diameter approx. 30 nm) was marked with a darker violet dye, while being homodispersed in hexylsalicylate-tetrachloroethylene (HS-PCE), as the liquid medium. Characterization of the physicochemical and performance properties of EIMCs showed remarkable nominal compression stress at rupture (3.9 ± 0.9 MPa). When subjected to a DC voltage of 20 V, the microcapsules created a writable display, potentially enabling users to write and rewrite. The response time was approximately 0.5 seconds (2 Hz refresh rate), comparable to commercial products. In vitro cytotoxicity and CD54 expression (h-CLAT) assays demonstrated that the microcapsule shell successfully mitigated solvent-induced immunotoxicity, maintaining high cellular viability (approx. 70%) and minimal sensitization (approx. 1.7%).
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Supplementary material from "Bio-interfacial engineering of electrophoretic coacervate microcapsules for cytocompatible on-skin displays"
AI summary Read the abstract
Scientists created a new type of "e-ink" display—the tech used in devices like e-readers—that's safe to wear directly on skin. Unlike current e-ink displays, which encase potentially toxic chemicals in hard plastic microcapsules, this version uses natural, biodegradable materials (from plant sap and gelatin) that flex with the body while safely containing the same irritating chemicals inside, so they don't harm skin cells. This could pave the way for comfortable, rewritable digital displays worn on skin without the health risks or plastic waste of current technology.
Bio-interfacial engineering of electrophoretic coacervate microcapsules for cytocompatible on-skin displays
AI summary Read the abstract
Scientists have created a new type of flexible, rewritable digital display that could be worn directly on skin, think e-paper you could wear like a sticker, by replacing the hard plastic microcapsules used in current e-ink screens with safer, plant- and animal-based materials (gum acacia and gelatin). Lab tests showed this new shell keeps skin cells healthy and doesn't trigger irritation, unlike traditional e-ink materials which can be toxic to human tissue. This matters because it could pave the way for wearable tech that's gentler on your skin while cutting down on synthetic microplastics in everyday products.
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