Fifth International Mediterranean Congress on Natural Sciences, Health Sciences and Engineering (MENSEC V), Budapest, Macaristan, 10 - 12 Eylül 2019, ss.191
Fifth International Mediterranean Congress on Natural Sciences, Health Sciences and Engineering (MENSEC V)
The Effects of Different Drying Methods on The Silica Nanoparticles
Ms. Busra Ozturk, Yildiz Technical University
Dr. Aysu Karakas Aydinoglu, Yildiz Technical University
Dr. Afife Binnaz Hazar Yoruc, Yildiz Technical University
Since natural silica mineral contains metallic impurities, it is not suitable for medical use and, to overcome this disadvantage, much work is being done on the artificial production of silica. In this study, Ludox AS-40 is used as synthetic silica resource and, has been dried using different drying methods to determine the best properties for reinforcing filler system for the silanization process. The effects of drying methods on the morphological and physical properties were studied using oven drying (OD), rotary evaporator (RE) and freeze-drying (FD). The grinding effect on the dried NSp was also evaluated. Grinding was performed mechanically with a conventional ball mill system. The features of the powders were evaluated using particle sizer, FE-SEM, BET, and tensiometer. The surface area of the silica nanoparticles was found to be OD <RE <FD. Contrary to expectations, the grinding process was not increased the surface area of NSp. This suggests that the particles are agglomerated as a result of the high surface energy of the silica particles and also the energy generated during the grinding process. The importance of wettability in this study is related to the silanization process. Better wettability means that the silanability of silica powders will be better. The particle size of the NSp’s was also calculated using the equation (p= 6000 / ABETρ) with silica density of 2.2 g/cm3 . As a result of this calculation, it was found that the particle size of the silica particles was in the range of 20-30 nm. To determine the convenient drying method, various parameters such as drying time and applicability in the industry were also be taken into consideration. As a result, the most effective drying method was selected as RE. RE dried NSp will be used as reinforcing fillers in the restorative dental composites.
Keywords: Nano Silica, Drying Effect, Oven Drying, Rotary Evaporation, Lyophilization, Wettability.
Presentation Type: Poster Presentation