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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika

Djusmaini Djamas

Jurusan Fisika, Universitas Negeri Padang, Sumatera Barat, Indonesia

Author-ID : 3511691

Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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Pengaruh variasi suhu annealing terhadap struktur dan ukuran butir silika dari abu tongkol jagung menggunakan X-Ray Diffractometer (The effect of annealing temperature variations on the structure and grain size of silica from corn cobs ash using X-Ray Diffractometer) Yoza Monalisa; Djusmaini Djamas; - Ratnawulan
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe development of technology and the use of silica in the industry is increasing, especially in the use of silica in the small particle size to the scale of microns or even nanosilika. The increasing need for silica it is necessary to find alternative materials that can be updated to produce silica. One is corn that has not been optimized. This research aims to investigate the structure and grain size of corn cob ash. This research is a form of experimentation with free variable 10000C annealing temperature and 11000C with a time of 6 hours of detention, control variables such as the mass of corn cobs, chemicals, and filter paper used. The dependent variable measures the levels of silica and silica crystals. Ash obtained was analyzed by gravimetric methods. Later in the annealing temperature of 10000C and 11000C for 1 hour will be obtained silica powder. Silica powder obtained by XRD to determine the crystal structure and the determination of the crystal grain size using Equation Schherer. After data collection and analysis of data obtained from crystalline silica structure is a diamond cubic structure with lattice parameter (a) is 7.01 Å. Grain size of the smallest crystals obtained at 11000C annealing temperature is 11.38 nm and the size of the crystal grain size of the greatest at 10000C annealing temperature is 40.83 nm. Keywords: grain structure, grain size, diffraction

Pengaruh variasi temperatur kalsinasi terhadap karakteristik kalsium karbonat (CaCO3) dalam cangkang keong sawah (Pila ampullacea) yang terdapat di Kabupaten Pasaman (The effect of calcination temperature variations on the characteristics of calcium carbonate (CaCO3) in the shells of rice field snails (Pila ampullacea) found in Pasaman Regency) Haryona Delvita; Djusmaini Djamas; - Ramli
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Snail paddy shells (Pila ampullacea) located in sub-discricts Simpang Alahan Mati Pasaman contain lots of calcium carbonate (CaCO3) that is widely utilized in the industry. On the research of test data was obtained in the form of deposits of calcium levels XRF shell snail paddy is 93,438%. Based on test data XRD is obtained that information due to the temperature of the calcination transformation phase aragonite to calcite phase. The rising temperature of calcination causes a change of the structure of CaCO3 from Hexagonal structure to Ortorhombik structure. The rising temperature of calcination, grain size CaCO3 anyone rise to a certain temperature and then decline, as the grain size increases from aragonite before dikalsinasi 83,872 nm became 106,302 nm dikalsinasi on temperature after 380 ̊C. While the phase of calcite have grain size on temperature 380 ̊C, 410 ̊C, 440 ̊C, 470 ̊C and 500 ̊C each 118,983 nm, 139,882 nm, 137,067 nm, 140,047 nm, and 63,533 nm

Pengaruh variasi penambahan serbuk grafit dalam pasir terhadap konduktivitas listrik beton K-350 (Effect of variations in the addition of graphite powder in sand to the electrical conductivity of K-350 concrete) Fitri Anika; Djusmaini Djamas; - Ramli
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Concrete conductive using graphite powder as a conductive material has not been optimized in their use of construction materials. Therefore, be used graphite powder as an ingredient added in the sand for the manufacture of concrete that is conductive. So with the addition of graphite powder in the sand is expected to produce electrical conductivity in the concrete. This is caused by the addition of carbon (C) contained in graphite powder is able to conduct electricity through the cement paste and aggregate, thus increasing the electrical conductivity of concrete. Has been testing an electric conductivity in volume of concrete K-350 with the addition of graphite powder variation of 0%, 5%, 10%, 15% and 20% using the test method Four-Point Probe. Results of testing the value of the electrical conductivity in the volume of concrete for each successive age the age of 7 days is 0.0229 (Ω.m)-1, 0.0286 (Ω.m)-1, 0.0306 (Ω.m)-1, 0.0358 (Ω.m)-1, 0.0374 (Ω.m)-1. At the age of 14 days in a row is 0.0132 (Ω.m)-1, 0.0177 (Ω.m)-1, 0.0207 (Ω.m)-1, 0.0250 (Ω.m)-1, 0.0291 (Ω.m)-1. At the age of 21 days in a row is 0.0099 (Ω.m)-1, 0.0135 (Ω.m)-1, 0.0155 (Ω.m)-1, 0.0164 (Ω.m)-1, 0.0204 (Ω.m)-1. At the age of 28 days in a row is 0.0074 (Ω.m)-1, 0.0101 (Ω.m)-1, 0.0111 (Ω.m)-1, 0.0121 (Ω.m)-1, 0.0152 (Ω.m)-1. From this study it can be concluded that the addition of graphite powder variations can increase the value of the electrical conductivity in the volume of concrete K-350, but declined against the concrete. This is caused by the influence of water content owned concrete

Analisis sifat listrik nanokomposit NiFe2O4/PANi yang disintesis dengan metode sol gel (Analysis of the electrical properties of NiFe2O4 / PANi nanocomposites synthesized by sol gel method) Sri Rahma Yani; Djusmaini Djamas
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

NiFe2O4/PANi nanocomposite was synthesized using the sol gel method with satisfying 2.5%, 5%, 30%, 50%, and 70% NiFe2O4 to PANi. Characterization of particle size, sample thickness, conductivity, and capacitance using X-ray diffraction (XRD), Scanning Microscope Electrons (SEM), and LCR Meter. Information sizes in 2.5%, 5%, 30%, 50%, and 70% are 37.16 nm, 54.16 nm, 31.2 nm, 42.23 nm, and 39.16 nm respectively. The electrical properties of NiFe2O4 / PANi Nanocomposites are used by using LCR meters, namely resistance and capacitance. The values of electrical conductivity generated from various meetings were 2.5%, 5%, 30%, 50%, and 70%, respectively 0.13 S / m, 0.08 S / m, 0.16 S / m, 0.57 S / m, and 0.25 S / m. From the measurement results show that the values of electrical conductivity in NiFe2O4 / PANi 2.5% high compared to NiFe2O4 / PANi 5% and again increase along with the increasing composition of NiFe2O4. However, in the condition of NiFe2O4 / PANi nanocomposite 70% electrical conductivity decreased. For large amounts of NiFe2O4 to PANi, the electrical conductivity increases. NiFe2O4 / PANi capacitance through a difference of 2.5%, 5%, 30%, 50%, and 70% resulted from successive measurements of 193.32 nF, 83.77 nF, 0.001 nF, 0.55 nF, 0 , 44 nF. The capacitance of NiFe2O4 / PANi shows that the greater the amount of NiFe2O4 to PANi the capacitance decreases.

Co-Authors Fitri Anika Haryona Delvita Ramli Ramli Sri Rahma Yani Yoza Monalisa

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