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All Journal Komunikasi Fisika Indonesia JOURNAL ONLINE OF PHYSICS
Ridwan Yusuf Lubis
Universitas Islam Negeri Sumatera Utara
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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ANALISIS PENGARUH PENAMBAHAN DAUN JAGUNG PADA KERAMIK BERPORI BERBAHAN DASAR TANAH LEMPUNG Ayu Amalya Rahma; Ety Jumiati; Ridwan Yusuf Lubis
Indonesian Physics Communication Vol 20, No 3 (2023): IN PROGRESS
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.%p

Abstract

Corn leaves are agricultural waste that contains silica compounds and functions to reduce cracks in the drying of porous ceramics. Variations in the composition of clay and corn leaf ash are: 100% : 0%, 90% : 10%, 80% : 20% and 70% : 30%. The manufacture of porous ceramics uses a dry pressing technique with a presure of 4 tons for 10 minutes, using a 3 cm x 3 cm x 3 cm mold, fired using a furnace at 900 0C for 2 hours and allowed to cool for 24 hours. The characterization used namely density, porosity, water absorption, hardness and compressive strength. The result of the charaterization of porous ceramics is: density 1,20-1,79 g/cm3, porosity 29,75-61.03%, water absorption 16,60-50,80%, hardness 41,41-187,58 MPa and compressive strength 3,51-84,49 MPa. The more addition of corn leaf ash caused an increase in porosity and to water absorption and decrease in density, hardness and compressive strength.
PENGARUH PENAMBAHAN ADITIF DAUN JAGUNG (Zea Mays) TERHADAP SIFAT FISIS DAN MEKANIK KERAMIK ALUMINA Ayu Dwi Retno; Ety Jumiati; Ridwan Yusuf Lubis
Indonesian Physics Communication Vol 20, No 3 (2023): IN PROGRESS
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.%p

Abstract

Research has been carried out on the manufacture of alumina ceramics. This study aims to determine the effect of the addition of corn leaf additives on the physical and mechanical properties of alumina ceramics. Variations in the composition of alumina and corn leaf ash are: 95% : 5%, 90% : 10% and 85% : 15%. The process of making these ceramics uses the die prissing method, and uses variations in firing temperature, namely 1300°C  and 1400°C for 1 hour, and is printed using a 3 cm x 3 cm x 1 cm mold. the characterization of the tests carried out included physical properties, namely density and porosity and mechanical properties, namely hardness.  The  results of the data obtained from  measuring  the  density  at 1300°C are 2.11-2.18 g/cm3 and at 1400°C they are2.13-2.20 g/cm3, the porosity at 1300°C is 25.82 % -  27.25% and 1400°C temperature of 25.36% - 26.89%, and 1300°C temperature hardness test of 59,641 Mpa-67,055 MPa and 1400°C° temperature of 61,926 MPa – 70,958 MPa.
PENGARUH GRAMATUR TERHADAP DAYA REGANG PADA PEMBUATAN KERTAS BERBAHAN KULIT Aiysah Hannum Pulungan; Ety Jumiati; Ridwan Yusuf Lubis
JOURNAL ONLINE OF PHYSICS Vol. 8 No. 3 (2023): JOP (Journal Online of Physics) Vol 8 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v8i3.24096

Abstract

Kertas adalah bahan tipis dan pipih yang terbuat dari serat-serat dari pulp yang digiling dan beberapa bahan yang selalu saling menempel. Serat yang digunakan berasal dari bahan alami antara lain selulosa dan hemiselulosa.Penelitian ini dilakukan untuk pembuatan kertas dari kulit singkong menggunakan aktivator NaOH 3%, 3,5% dan 4%. Penelitian yang dilakukan yaitu dengan metode eksperimen secara kuantitatif. Berdasarkan hasil pengujian diperoleh pengujian meliputi gramatur, daya regang serta karakterisasi SEM. Dari pengujian dapat dihasilkan nillai gramatur sampel A = 49,33 g/cm2, sampel B = 50,33 g/cm2, sampel C = 56,33 g/cm2, dan hasil nilai daya regang sampel A = 0,0015%, sampel B= 0,0024 %, dan sampel C = 0,0029%. Hasil SEM menunjukkan kertas yang diaktivasi NaOH 4% memiliki serat yang lebih rapat dibandingkan kertas yang diaktivasi NaOH 3% dan 3,5%. Dari hasil nilai karakterisasi sampel dapat diketahui bahwa sampel C merupakan sampel yang terbaik dengan pengaruh NaOH 4% yang telah memenuhi SNI No 14-0937-2005 mengenai kertas.
PERANAN AKIVATOR DAN LUAS PENAMPANG KARBON AKTIF TERHADAP KEMAMPUAN ADSORPSI KARBON AKTIF PADA MINYAK GORENG BEKAS PAKAI Miftahul Husnah; Ridwan Yusuf Lubis; Lisa Astari
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 1 (2023): JOP (Journal Online of Physics) Vol 9 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i1.26005

Abstract

Used oil or used cooking oil is oil that is produced from leftover frying. The high price of cooking oil and the high need for use also makes fried traders use used cooking oil continuously which has a negative impact on health. This study aims to determine the role of activators and cross-sectional area on the adsorption ability of activated carbon produced from nipa palm shells in the process of refining used oil. The sample used is used cooking oil which is then adsorbed using activated carbon with different cross-sectional areas. Analysis of the cross-sectional area shows that variations in the concentration of NaCl as an activator in the manufacture of activated carbon from nipa palm shells affect the cross-sectional area, the higher the concentration of NaCl activator, the greater the cross-sectional area of activated carbon produced. The surface area of activated carbon activated by NaCl 0M, 4M, 6M and 8M had respective values of 11.1489 m2/g, 11.4487 m2/g, 11.5028 m2/g, 11.5079 m2/g. The results show that the greater the cross-sectional area of activated carbon, the greater the ability of activated carbon to adsorb used oil, with a value of water content and volatile matter of 0.2612% - 0.1195%, peroxide of value (POV) of 11.8629 meq/g - 5.3029 meq/g, Acid Value (AV) of 1.3368 mg KOH/g - 0.5393 mg KOH/g. Optimum results were obtained on activated carbon activated with 8M NaCL activator, this was due to the increasing concentration of the activator, more pores were formed so that the absorption capacity of activated carbon also increased.
Co-Authors Aiysah Hannum Pulungan Ayu Amalya Rahma Ayu Dwi Retno Jumiati, Ety Lisa Astari Miftahul Husnah