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All Journal BERKALA SAINSTEK Briliant: Jurnal Riset dan Konseptual
Ummami, Riza
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Mathematics Physics

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Synthesis and Characterization of Bacterial Cellulose-Polyaniline Composite with Variation of Dopant Concentration Ummami, Riza; Busroni, Busroni; Piluharto, Bambang
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.18120

Abstract

Polyaniline is a type of conductive polymer. Bacterial cellulose has high mechanical properties, so it can be made into polyaniline base composite materials. A stable form of polyaniline oxidation at room temperature is emeraldine base. The emeraldine base has a conductivity value of 10-6 S/cm. Dopants can change the shape of emeraldine base to emeraldine salt by protonation process. Emeraldine salt is a conductive form of polyaniline. The conductivity value of emeraldine salt is 0,03-0,07 S/cm. The addition of dopan in synthesis of polymer was carried out to determine its effect on the conductivity value. The disadvantage of polyaniline is that its mechanical properties are weak and easily brittle. Modifications are needed to improve the mechanical properties of polyaniline, one of which is the manufacture of composite. Bacterial celluloce has high mechanical properties so it can be made into polyaniline base composite materials. Synthesis of bacterial cellulose-polyaniline composites by in situ chemical polymerization methods. Syntehsis is started with BC membrane was dipped into aniline solution for about 2h with stirring at room temperature. The BC was immersed into ammonium peroxydisulfate solution for about 30m with stirring. The bacterial cellulose-polyaniline compositions obtained are black color which is characteristic of the emeraldine salt. The highest conductivity value of composite was obtained from the addition of 3,5M HCl dopant which was 4,70x10-4 S/cm. FTIR analysis of composite obtained peak of the characteristic polyanilin was conductive at 1565,92 cm-1 as C=C quinoid ring and 1442,95 cm-1 as C=C benzoid ring.
Guest lecturer dan Pengaruhnya Terhadap Motivasi Berwirausaha Mahasiswa Pendidikan Ilmu Pengetahuan Sosial Pusposari, Luthfiya Fathi; Ummami, Riza; Akhmaliyyah, Nabilatul
BRILIANT: Jurnal Riset dan Konseptual Vol 8 No 1 (2023): Volume 8 Nomor 1, Februari 2023
Publisher : Universitas Nahdlatul Ulama Blitar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28926/briliant.v8i1.1160

Abstract

Tujuan penelitian untuk mengevaluasi pengaruh guest lecturer terhadap motivasi berwirausaha mahasiswa. subjek penelitian mahasiswa PIPS UIN Malang. Desain penelitian menggunakan one group quasi eksperimen. Pengukuran motivasi berwirausaha menggunakan angket yang telah melalui uji validitas dan reliabilitas. Analisis menggunakan statistik parametrik paired sampel t test. Hasil penelitian menunjukkan motivasi berwirausaha mahasiswa setelah mengikuti guest lecturer meningkat. Prosentase pertumbuhan paling besar disebabkan oleh motivasi ekternal, disusul internal dan altruistik. Temuan selanjudnya menunjukkan tanpa adanya guest lecturer, motivasi berwirausaha turun. Disarankan pada setiap program studi dapat memfasilitasi kegiatan guest lecturer sebagai bagian dari pembelajaran kewirausahaan
Co-Authors Akhmaliyyah, Nabilatul Bambang Piluharto Busroni, Busroni Luthfiya Fathi Pusposari