Judul: Membran Polistirena Tersulfonasi untuk Aplikasi pada Microbial Fuel Cell
Abstrak: Microbial fuel cell (MFC) is a major type of bielectrochemical system that converts biomass spontaneously into electricity through the activity of microorganisms. The sulfonated polystyrene (PSS) membrane can be used as a proton exchange membrane (PEM) in application on MFC. PEM has been characterized on PSS using fourier transform infrared spectrophotometer (FTIR), scanning electron microscope (SEM), and degree of sulfonation (DS) parameter, and conductivity value. The result of FTIR analysis in 10% PSS membranes showed sulfonate group (SO3) absorption at wavenumber 1029.39 and 1178.03 cm-1. PSS membrane surface morphology based on SEM is categorized non-porous. The success of the sulfonated process indicated by the DS of the membranes of sulfonated PSS 3%, 5%, and 10% were 35.09%, 42.27%, and 48.15%, respectively. The result of the conductivity (σ) value obtained by PS, PSS 3%, PSS 5%, and PSS 10% were 1.1455×10-8, 1.5511×10-6, 3.0919×10-6, and 3.8949×10-6 S.cm-1, respectively. MFC performance showed the presence of microbe in cow’s rumen liquid with total plate count. The membranes of PSS 3%, 5%, and 10% can produce different potential of 9, 10, and 14 mV respectively, meaning that the PSS membrane can be applied as a MFC
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Judul: Sintesis dan Karakterisasi Membran Penukar Proton Polistirena Tersulfonasi sebagai Bahan Perangkat Direct Methanol Fuel Cell
Abstrak: Sulfonated polystyrene can be used as proton exchange membrane (PEM). Characterization and performance of PEM has been performed on sulfonated polystyrene (PSS) using fourier transform infrared spectrophotometer, scanning electrone microscope, and degree of sulfonation (DS) parameter. The success of the process indicated by the DS of the membrane PSS 3%, 5%, and 10% were 35.09%; 42,26%; and 48.15%, respectively. The infrared spectrum shows that sulfonation has been succesful in 10% PSS membranes as indicated by the presence of sulfonate groups (-SO3) at wavenumber 1029.39 and 1178.03 cm-1. PSS membrane surface morphology is categorized non-porouse. Methanol permeability with qualitative test showed that the membrane PSS 3%, 5%, and 10% have no infiltration. The results of measurements of the conductivity (σ) obtained by PS, PSS 3%, PSS 5%, and PSS 10% were (0.0114; 1.5511; 3.0919; and 3.8949) × 10-6 S/cm, respectively. So that the membrane PSS 3%, 5%, and 10% can be used as a device in direct methanol fuel cell.
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Judul: Komparasi Anatomi Skelet Kepala Badak Kalimantan (Dicerorhinus sumatrensis harrissoni) Dengan Badak Sumatera (Dicerorhinus sumatrensis sumatrensis).
Abstrak: Penelitian ini bertujuan untuk mempelajari dan mengalisa struktur skelet kepala badak kalimantan (Dicerorhinus sumatrensis harrissoni) yang dibandingkan dengan skelet badak sumatera (Dicerorhinus sumatrensis sumatrensis) serta dikaitkan dengan perilakunya. Penelitian ini menggunakan skelet kepala badak kalimantan, Najaq, berasal dari Kutai Barat, Kalimantan Timur untuk dianalisa struktur tulangnya dibandingkan dengan skelet kepala badak sumatera, Dusun, yang ada di Laboratrium Anatomi FKH IPB. Penelitian ini menunjukkan bahwa ukuran skelet kepala dan volume cavum cranii badak kalimantan lebih kecil dibandingkan badak sumatera, bagian cranial ujung apex nasii relatif lebih datar sedangkan pada badak sumatera relatif melengkung ke arah ventral. Bagian caudal skelet kepala memiliki posisi lebih vertikal dibandingkan badak sumatera. Facies parietale skelet kepala badak kalimantan relatif lebih sempit sesuai dengan volume cavum cranii. Badak kalimantan memiliki formulasi gigi I2/1, C0/0, P3/3, M3/3. Badak kalimantan memiliki dentes incisivus II (I2) pada rahang atas, tidak seperti anggota famili Rhinocerotidae lainnya yang hanya memiliki dentes incisivus I (I1). Hasil pengamatan keausan gigi badak kalimantan secara umum menunjukkan usia badak kalimantan yang diteliti sudah tua. Secara umum skelet kepala badak kalimantan memiliki karakteristik yang berbeda dari badak sumatera.
Keyword: anatomi, badak kalimantan, rhinocerotidae, skelet kepala