WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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  • Article
    Design and Performance of SiOC Foam-Silica Aerogel Composites for Hot and Cold Thermal Management Applications
    (Elsevier Ltd, 2025) Icin, Oyku; Vakifahmetoglu, Cekdar
    This study focuses on the fabrication of monolithic preceramic polymer-derived ceramic (SiOC) foam-silica aerogel composites by filling the open cells of ceramic foam with a silica aerogel solution using the sol-gel technique. The effects of different drying techniques (ambient pressure vs CO2 supercritical drying) and surface modification agents, including trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDZ), are comprehensively investigated. These factors are analyzed for their influence on the composites' morphology, porosity, chemical structure, and thermal insulation performance. The drying technique and surface modification agents are found to play a critical role in achieving a high filling ratio of silica aerogel within the composites. Pure silica aerogels exhibit specific surface areas (SSAs) reaching similar to 1120 m(2).g(-1), while the SiOC foam-silica aerogel composites demonstrate SSAs of 385-440 m(2).g(-1). Nearly all samples achieve a total porosity of similar to 93 vol%. Surface modification effectively tailors the surface properties, imparting hydrophobicity with a water contact angle of 133 degrees. Thermal conductivity at room temperature ranges between 38 and 43 mW<middle dot>m(-1)<middle dot>K-1. The potential applications of these SiOC foam-silica aerogel composites as thermal insulators are assessed under extreme thermal conditions. For instance, a 14 mm thick composite has a temperature of -27 degrees C when subjected to a cold source at -78 degrees C. Instead, when exposed directly to a butane flame (similar to 1200 degrees C), the backside of the composite recorded only similar to 57 degrees C.
  • Article
    Citation - WoS: 10
    Citation - Scopus: 10
    Comparison of the Rermineralisation Effect of a Glass Ionomer Cement Versus a Resin Composite on Dentin of Primary Teeth
    (Ariesdue Srl, 2014) Aykut-Yetkiner, A.; Simsek, D.; Eronat, C.; Ciftcioglu, M.
    Aim The aim of this study was to investigate the interaction of a high viscosity glass ionomer cement (G/C) and a composite resin with caries affected dentin and to determine the remineralization levels. Materials and Methods In a split Mouth deSign 24 GIC and composite resin atraumatic restorative treatment restorations were made in vivo and the teeth were collected after 2 years and subsequently settioned and examined using Vickers microhardness test; the latter was performed starting from the dentin surfate adjacent to the restoration. Repeated Measure ANOVA and Bonferroni Statistical methods were used for data analysis. Results The micrdhardness adjacent to the GIC reStorative material resulted tube significantly higher. Conclusion GIC resulted to be a better restorative material for the remineralization of caries affected dentin, though further studies are necessary for the corroboration of this finding. The GIC restored primary molar dentin had a higher level of remineralizatiOn and GIC could be the material of chdice in pediatric dentistry.