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- Dollmann, Antje, et al.
(författare)
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Deformation twins as a probe for tribologically induced stress states
- 2024
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Ingår i: Communications Materials. - 2662-4443. ; 5:1
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Tidskriftsartikel (refereegranskat)abstract
- Friction and wear of metals are critically influenced by the microstructures of the bodies constituting the tribological contact. Understanding the microstructural evolution taking place over the lifetime of a tribological system therefore is crucial for strategically designing tribological systems with tailored friction and wear properties. Here, we focus on the single-crystalline High-Entropy Alloy CoCrFeMnNi that is prone to form twins at room temperature. Deformation twins feature a pronounced orientation dependence with a tension-compression anisotropy, a distinct strain release in an extended volume and robust onset stresses. This makes deformation twinning an ideal probe to experimentally investigate the complex stress fields occurring in a tribological contact. Our results unambiguously show a grain orientation dependence of twinning under tribological load. It is clearly shown, that twinning cannot be attributed to a single crystal direction parallel to a sample coordinate axes. With deformation twins in the microstructure, stress field models can be validated to make them useable for all different tribological systems.
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| 2. |
- Meng, Lingyin, et al.
(författare)
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A conducting polymer-based array with multiplex sensing and drug delivery capabilities for smart bandages
- 2024
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Ingår i: COMMUNICATIONS MATERIALS. - : SPRINGERNATURE. - 2662-4443. ; 5:1
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Tidskriftsartikel (refereegranskat)abstract
- Effective individual wound management, particularly in cases of prolonged healing and increased infection vulnerability, has prompted the development of wound theranostics, combining real-time diagnostic assessment and on-demand treatment. Here, we present a multifunctional conducting polymer-based smart theranostic bandage that integrates pH sensing, pH-compensated uric acid (UA) biosensing, and on-demand antibiotic release using different conducting polymers, each leveraging their advantageous intrinsic properties. Specifically, the polyaniline-based pH sensor operates reversibly across a pH range of 4-10, while the functionalized poly(3,4-ethylenedioxythiophene)-based UA biosensor exhibits a linear response up to 0.9 mM UA. Simultaneous detection of pH and UA allows accurate UA determination via pH compensation. Upon detecting abnormal pH/UA levels, the polypyrrole-based drug carrier releases ciprofloxacin via 0.6 V electrical stimulation, successfully inhibiting bacterial growth in vitro. The array is assembled as a 3D patch, connected to a flexible printed circuit board, and embedded in a wound bandage, offering potential for remote wound monitoring, targeted treatment, and wireless wound management. Smart devices for wound management combine biosensing with drug release. Here, a smart theranostic bandage is reported that can detect pH and uric acid levels and release antibiotics as necessary, all of which can be done remotely.
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