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Monoolein-Based Wireless Capacitive Sensor for Probing Skin Hydration.
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö University, Biofilms Research Center for Biointerfaces.ORCID iD: 0009-0005-4825-9569
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö University, Biofilms Research Center for Biointerfaces.ORCID iD: 0000-0001-6688-3860
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö University, Biofilms Research Center for Biointerfaces.ORCID iD: 0000-0001-6254-8539
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Department of Applied Physics and Naval Technology, Polytechnical University of Cartagena, 30202 Cartagena, Spain.ORCID iD: 0000-0001-5518-4095
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2024 (English)In: Sensors, E-ISSN 1424-8220, Vol. 24, no 14, article id 4449Article in journal (Refereed) Published
Abstract [en]

Capacitive humidity sensors typically consist of interdigitated electrodes coated with a dielectric layer sensitive to varying relative humidity levels. Previous studies have investigated different polymeric materials that exhibit changes in conductivity in response to water vapor to design capacitive humidity sensors. However, lipid films like monoolein have not yet been integrated with humidity sensors, nor has the potential use of capacitive sensors for skin hydration measurements been fully explored. This study explores the application of monoolein-coated wireless capacitive sensors for assessing relative humidity and skin hydration, utilizing the sensitive dielectric properties of the monoolein-water system. This sensitivity hinges on the water absorption and release from the surrounding environment. Tested across various humidity levels and temperatures, these novel double functional sensors feature interdigitated electrodes covered with monoolein and show promising potential for wireless detection of skin hydration. The water uptake and rheological behavior of monoolein in response to humidity were evaluated using a quartz crystal microbalance with dissipation monitoring. The findings from these experiments suggest that the capacitance of the system is primarily influenced by the amount of water in the monoolein system, with the lyotropic or physical state of monoolein playing a secondary role. A proof-of-principle demonstration compared the sensor's performance under varying conditions to that of other commercially available skin hydration meters, affirming its effectiveness, reliability, and commercial viability.

Place, publisher, year, edition, pages
MDPI, 2024. Vol. 24, no 14, article id 4449
Keywords [en]
amphiphilic film, humidity sensor, monoolein, skin hydration, wireless device
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:mau:diva-70064DOI: 10.3390/s24144449ISI: 001277111700001PubMedID: 39065849Scopus ID: 2-s2.0-85199781478OAI: oai:DiVA.org:mau-70064DiVA, id: diva2:1886640
Available from: 2024-08-02 Created: 2024-08-02 Last updated: 2026-02-17Bibliographically approved
In thesis
1. Wireless optical and electrical sensors, and combinations thereof, for biomedical applications
Open this publication in new window or tab >>Wireless optical and electrical sensors, and combinations thereof, for biomedical applications
2025 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The studies explore advancements in wireless sensor technologies for medical applications, particularly for wireless detection of skin hydration, non-invasive glucose monitoring, and microbial detection. The first academic paper describes a capacitive humidity sensor for assessing relative humidity and skin hydration, utilizing the sensitive dielectric properties of the monoolein–water system. Tested across various humidity levels and temperatures, these novel double-functional sensors feature interdigitated electrodes covered with monoolein and show a promising potential for wireless detection of skin hydration. The second and third academic papers focus on a wireless potentiometric sensor designed to detect bacteria in urine and monitor microbial biofilm formation in wounds, respectively, using Bluetooth-enabled sensors to detect bacterial growth in vitro and ex vivo. The fourth paper assesses the development of fluid-less, non-invasive blood glucose monitoring devices, comparing their accuracy and challenges with traditional invasive methods. Despite some improvements, the study reveals that current devices like the BG20 glucometer need significant enhancements to meet clinical accuracy standards. Overall, the thesis emphasizes the potential of innovative wireless sensor technologies in improving medical diagnostics, while also addressing the limitations that must be overcome to ensure clinical reliability.

Abstract [sv]

I denna avhandling undersöks utvecklingen av trådlösa sensorer för medicinska tillämpningar, med fokus på mätning av hudhydrering, icke-invasiv övervakning av blodsocker och detektion av bakterier. Genom att kombinera avancerade material och innovativa tekniker inom trådlös kommunikation har sensorer utvecklats som kan mäta fysiologiska parametrar och upptäcka infektioner på ett enkelt och bekvämt sätt.

Ett av projekten presenterar en trådlös kapacitiv sensor som mäter hudens fukthalt genom att registrera förändringar i kapacitans. Sensorn är baserad på ett biokompatibelt material, monoolein, som reagerar på fukt och temperaturförändringar. Testning visade att sensorn effektivt kunde spåra hudens fuktnivåer, även efter fysisk aktivitet, och att dess mätningar stämde väl överens med kommersiella referensinstrument. Detta gör teknologin lovande för användning inom både vård och personlig hälsa.

En annan del av avhandlingen beskriver en potentiometrisk sensor, modifierad med ett redoxaktivt ämne, som används för att detektera bakterietillväxt i urin och övervaka bakteriella biofilmer i sår. Sensorn är trådlös och kan mäta elektriska potentialförändringar som uppstår vid mikrobiell aktivitet. Resultaten visade att sensorn kan identifiera bakterier både i laboratoriemiljö och i simulerade biologiska miljöer, vilket öppnar möjligheter för realtidsövervakning av infektioner. Slutligen har icke-invasiva metoder för blodsockermätning utvärderats. En enhet med flera sensorer, inklusive en nära infraröd sensor, testades och jämfördes med traditionella blodprov. Även om tekniken erbjuder bekvämlighet visade studien att den inte ännu uppfyller de höga noggrannhetskraven för kliniskt bruk, men förbättringar genom maskininlärning och effektivare algoritmer kan potentiellt lösa dessa utmaningar.Avhandlingen framhäver de stora möjligheterna med trådlösa sensorteknologier för medicinsk diagnostik och övervakning. Samtidigt identifieras viktiga begränsningar som måste övervinnas för att säkerställa att dessa teknologier blir kliniskt pålitliga. På sikt kan de erbjuda nya sätt att förbättra vården genom att möjliggöra kontinuerlig, icke-invasiv och patientnära datainsamling.

Place, publisher, year, edition, pages
Malmö: Malmö University Press, 2025. p. 62
Series
Malmö University Health and Society Dissertations, ISSN 1653-5383, E-ISSN 2004-9277 ; 2025:1
National Category
Biomedical Laboratory Science/Technology
Identifiers
urn:nbn:se:mau:diva-72794 (URN)10.24834/isbn.9789178775194 (DOI)978-91-7877-518-7 (ISBN)978-91-7877-519-4 (ISBN)
Public defence
2025-01-10, Auditorium E002, Faculty of Health and Society, Jan Waldenströms gata 25, Malmö, 10:00 (English)
Opponent
Supervisors
Note

Paper III in dissertation as manuscript.

Paper IV submitted.

No papers included in the fulltext online.

Available from: 2024-12-17 Created: 2024-12-17 Last updated: 2026-02-17Bibliographically approved

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Chaturvedi, VivekFalk, MagnusBjörklund, SebastianGonzalez-Martinez, Juan FShleev, Sergey

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