Sintesis Pigmen Besi Oksida Berbahan Baku Limbah Industri Baja (Mill Scale)

Limbah industri baja (mill scale) digunakan sebagai alternatif bahan baku pigmen besi oksida. Kajian ilmiah ini menjelaskan proses pembuatan pigmen besi oksida melalui metode presipitasi dengan media air. Pigmen besi oksida yang menjadi target yaitu pigmen kuning goethit ( -FeOOH) dan merah hematit ( -Fe2O3). Goethit diperoleh dengan presipitasi menggunakan amonia dari proses awal terbentuknya ferricssulfat hasil reaksi asam sulfat (H2SO4) dengan limbah mill scale, sedangkan hematit diperoleh dengan proses pemanasan goethit pada temperatur 5000C dan 9000C. Analisa XRD digunakan untuk mengetahui senyawa pigmen yang terkandung dan penggunaan DTA untuk mengetahui pola Perubahan fasa akibat proses pemanasan fasa goethit. Analisa warna pigmen menggunakan collorimetri L*a*b System. Warna pigmen yang diperoleh mempunyai tinting strength yang masih kurang dibandingkan dengan pigmen impor

Synthesis and Characterization of Zinc Oxide Nanoparticles-based Dental Cement

Dental cement-based mixture of zinc oxide and eugenol is one of the commonly used dental cement. One of the major shortcomings that limit its application is dental cement zinc oxide and eugenol has detrimental mechanical properties. This study aims to carry out the synthesis and characterization of nano-based dental cement of zinc oxide mixed with eugenol with the hypothesis that zinc oxide nanoparticles will provide better mechanical properties. Physical and mechanical properties of cement-based dental cement oxide nanoparticles will be compared with dental cement zinc oxide microparticles.Mixing eugenol and ZnO nanoparticles were made by the composition of the powder 0.4 g, 0.45 g, 0.5 g, 0.55 g, 0.6 g and 0.2 mL of fluid. ZnO nanoparticles as a powder slowly mixed with liquid, so as to produce pasta. Methods of analysis include compressive strength, hardness and microstructure observation. From a series of studies and analysis, the surface morphology of the samples obtained by the nanoparticles-based dental cement is smoother and has a little fracture compared with microparticles-based dental cement. Likewise, the mechanical analysis of dental cement, ZnO nanoparticles can increase the compressive strength and hardness of thematerial. The conclusions are that the addition of nanoparticles can enhance physical and mechanical characteristics

The Effect of Zno Particle on Zinc Phosphate Cement Microstructure

Dental cement based on zinc phosphate (Zinc Phosphate Cement) is the oldest dental cement that is still widely used today. One disadvantage of zinc phosphate-based dental cement is its low mechanical properties. In this study, ZnO nanoparticles are added to the zinc phosphate dental cement with the hypothesis that there will be the strengthening of the mechanical properties of dental cement. The fraction of ZnO nanoparticles were variedly added from 0.1 g, 0.5 g, 1 g and 1.5 g to the zinc phosphate dental cement which is then compared to the dental cement without the addition of ZnO nanoparticles. The materials were manually mixed and mold to form dental cement pellets (4 mm thick and 4 mm in diameter). Characterization of pellet hardness and strength result in a linear value to the addition of ZnO nanoparticles in which the value of hardness and strength increases as increasing of ZnO nanoparticles fractions. XRD analysis results indicate the appearance of peaks Zn3(PO4)2.4H2O and ZnO compounds supported by the analysis of surface structure using SEM. The resulting dental cements have an increased value of hardness and compressive strength due to the improvement of its micro structure having a small amount of crack and a homogeneous distribution of nano ZnO. Through this phenomenon, it can be concluded that the addition of nano-ZnO can be applied to increase the value of hardness and strength in dental cement

Pengaruh Milling terhadap Karakteristik Nanopartikel Biomassa Rotan

The huge availability of rattan biomass is a fiber rich natural resource that resulted from rattan processing. Nanoparticles biomass is selected material with high potential to be further developed and studied as filler composites, which rattan has better mechanical physical properties than synthetic. Thefiber objective of this study is to obtain natural fiber nanoparticles from rattan biomass as a reinforcing material of PP (Polypropylene) using milling method with time variation of 15, 30 and 45 minutes. The result of using milling method with Herzong tool, the optimum milling time ws 30 minutes with an average particle size of 24.35 nm in the range 15:49 24.35 - 48.99 through PSA test equipment, which using the method ofdistribution comulant amount (number), the surface morphology of nanoparticles fiber rattan skin shows the longer time milling, the smaller the particle size, and ACS amounted to 0.9833 Å (0.09833 nm) with a FWHM 0.1557 rad