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Journal : Periodic

SINTESIS KERAMIK REFRAKTORI AL2O3.MNO2.SIO2 DENGAN METODA SOL-GEL DAN SIFAT FISIKANYA DALAM BERBAGAI TEMPERATUR KALSINASI Muthia, Rahmi; Beri, Deski; Amran, Ali
Periodic Vol 2, No 1 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v2i1.1934

Abstract

Ceramic oxide Al2O3.MnO2.SiO2 ceramics has relatively high strength, tough electrical capacitance and temperature resistant. It?s synthesized by sol-gel methods using raw materials Tetraethyl Orthosilicates (TEOS), Al (NO3) 3.9H2O and Mn (NO3) 2.4H2O with calcination temperature variation of 900-1100oC. XRD (X-Ray Diffraction) analysis of ceramic Al2O3.MnO2.SiO2 showes peak °2Th=33.2875 intensity relatif=100%, °2Th=55.8688 intensity relatif 24,28%,°2Th=26.1289 intensity relatif 13,22%,°2Th=66.4815 intensity relatif 12,84%,°2Th=35.4375 intensity relatif 11,39%. Ceramic Al2O3.MnO2.SiO2 morphology by SEM (Scanning ElectronMicroscopy) showed that the ceramic at a temperature of 1100oC was homogeneous microscopic. Capacity as measured by the LCR meter instrument empirical equation F (C, T) = 0.01625 T - 11.0833 can be explained that the higher the calcination temperature the higher the value of the capacitor capacity.
PREPARASI DAN KARAKTERISASI KOMPOSITSELULOSA BAKTERIAL-EKSTRAK DAUN KACA PIRING(GARDENIA AUGUSTA) UNTUK APLIKASI BIOMEDIS Sartika, Silvia Dewi; Putra, Ananda; Amran, Ali
Periodic Vol 5, No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v5i2.108528

Abstract

Bacterial Cellulose (BC) was fermented coconut water with the aid of Bacteria Acetobacter xylinum. The generated BC became composite by adding a natural ingredient of Ectract of Gardenia augusta Leaves (EGAL). Gardenia augusta leaves was an annual shrub of the coffee genus or rubiaceae. Gardenia augusta leaves contain of chemicals such as flavonoids, saponins, tanins, galat and steroid or terpenoids. This research aimedat determining the effect of immersion time of Bacterial Cellulose in EGAL within 1,2,3 and 4 days onphysical properties (water content), mechanical properties (Compressive Strength using Toni technik Compressive Test Bauform Model 2020 and Tensile Strength using Buchel B.V Horizontal Tensile Tester model No. K465,item 84-58-00-0002 range 500N, 230V-50Hz), and Structural (Functional Groups using FTIR and Crystalinity using XRD) against Composite Bacterial Cellulose-Ectract of Gardenia augusta Leaves (CBC-EGAL) produced. The results showed the water content test,compressive strength test and the tensile strength test of CBC-EGAL are still belowed the minimum standard of articular cartilage. It was caused by least EDKP that goes into the matrix (SB).EGAL also could increase modulus young of BC. The result of XRD spectra and FTIR difractogram  showed that BC and CBC-EGAL wasbelonging to cellulose type-I.