Judul: Membran Komposit Polisulfon Tersulfonasi-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Direct methanol fuel cell (DMFC) is potential as an alternative renewable energy source and unhazardous to environmental. In this study, composite membrane of sulfonated polysulfone-zeolite (sPSf-zeolite) was synthesized and characterized, and observed the performance of the resulted membranes for DMFC. The process of sulfonation has been successful. It showed by the degree of sulfonation as high as 45% and the existence of a new group that trisubstituted 1,2,4 - that shown in the wave numbers of 1724 cm-1 as determined using Fourier transform infrared spectrophotometer. The morphology of membrane surface changed after sulfonation. It was determined using scanning electron microscope. The addition of zeolite to membranes improved membrane’s performance. The composite membrane of sPSf-zeolite 5% activation, using a metal electrode gave the best membrane’s performance. It showed by the highest proton conductivity and voltage with values 1.2377 × 10-3 S/cm and 416 mV. This result showed that the composite membrane of sPSf-zeolite can be applied in DMFC system.
Keyword: Bogor Agricultural University (IPB), zeolite., sulfonated polysulfone, fuel cell, composite

Judul: Sintesis dan Pencirian Membran Komposit Polistirena Tersulfonasi-Zeolit untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: This study focused on synthesis and characterization of sulfonated polystyrene (SPS)-zeolit composite membrane as a proton exchange membrane for direct methanol fuel cell (DMFC). Sulfonation of polistyrene was done by using SO3 gas from oleum at 60 oC. The composite membrane was then synthesized with zeolite composition variation of 3%, 5%, and 7%. The success of the sulfonation process was indicated by the highest degree of sulfonation of PSS membrane with 15% concentration of polystyrene, that was 99.93%. The PSS Fourier transform infrared spectra of the composite membranes showed sulfonate group (-SO3) at 910.44 cm-1 and O-Si-O at 1091 cm-1. Topography study by using atomatic force microscope showed that the sulfonate groups of PSS were covered by the zeolite. The highest water uptake, proton conductivity, and potential difference were showed by the composite membrane with 5% of zeolite, that were 10.17%, 2.0339 10-6 S/cm, dan 15 mV respectively, showing that the PSS membrane can be applied in DMFC system.
Keyword: zeolite, sulfonation, polystyrene, DMFC, composite

Judul: Keanekaragaman Spesies Burung Pada Beberapa Ketinggian Di Resort Gunung Putri Taman Nasional Gunung Gede Pangrango
Abstrak: Keanekaragaman Spesies Burung Dipengaruhi Oleh Beberapa Faktor Seperti Ketinggian Tempat, Vegetasi Dan Suhu. Tujuan Penelitian Ini Untuk Membandingkan Keanekaragaman Di Berbagai Ketinggian Tempat Dan Mengidentifikasi Kelompok Burung Campuran. Penelitian Dilakukan Pada Ketinggian 1600, 1800, 2000, 2200 Dan 2400 Mdpl Di Resort Gunung Putri, Taman Nasional Gunung Gede Pangrango. Suhu Dan Kelembaban Diukur Dengan Termometer Bola Basah-Bola Kering. Data Vegetasi Diambil Dengan Metode Jalur Berpetak. Data Burung Dikumpulkan Dengan Metode Titik Hitung Dan Look And See. Jumlah Spesies Dan Indeks Keanekaragaman Burung (H’) Mengalami Penurunan Mulai Pada Ketinggian 2000 Mdpl. Nilai Indeks Keanekaragaman Tertinggi Ada Pada Ketinggian 2000 Mdpl (H’=2,40). Kelompok Campuran Yang Teridentifikasi Sebanyak 5 Kelompok Di Ketinggian 2000-2400 Mdpl. Srigunting Kelabu (Dicrurus Leucapheus) Dan Srigunting Bukit (Dicrurus Remifer) Merupakan Pemimpin (Nuclear) Dalam Kelompok Dan Munguk Loreng (Sitta Azurea) Dan Kacamata Gunung (Zosterops Montanus) Merupakan Spesies Yang Paling Banyak Dijumpai.
Keyword: Gunung Putri, Keanekaragaman, Ketinggian Tempat, Spesies Burung