Article Per Year (5 Year)
p-Index From 2021 - 2026
3.397
P-Index
This Author published in this journals
All Journal International Journal of Renewable Energy Development Jurnal AGROTEKNOLOGI Jurnal Ilmu Dasar BERKALA SAINSTEK Pelita Perkebunan Jurnal Kimia Mulawarman UNEJ e-Proceeding Jurnal Kimia Riset Jurnal Pemberdayaan Masyarakat Madani (JPMM) ALCHEMY Jurnal Penelitian Kimia J-Dinamika: Jurnal Pengabdian Kepada Masyarakat Jurnal Abdi: Media Pengabdian Kepada Masyarakat Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Indonesian Chimica Letters Warta LPM Molekul: Jurnal Ilmiah Kimia International Journal of Renewable Energy Development Engagement: Jurnal Pengabdian Kepada Masyarakat al Kimiya : Jurnal Ilmu Kimia dan Terapan
Bambang Piluharto
Department Of Chemistry, Universitas Jember, Jl. Kalimantan 37 Kampus Tegalboto, Jember 68121
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

Published : 32 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 32 Documents
Search

 1   2   3   4 
Preparation of Cellulose Acetate Membranes via Phase Inversion for Osmometric Molecular Weight Determination of Macromolecules Syarifatul Lailah; Indarti, Dwi; Piluharto, Bambang; Mulyono, Tri; dwi ananda, Tinok
Indonesian Chimica Letters Vol. 5 No. 1 (2026)
Publisher : Department of Chemistry, FMIPA, UNEJ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v5i1.60009

Abstract

Membrane osmometry is a crucial analytical technique for determining the molecular weight of macromolecules, demanding highly selective semi-permeable membranes to prevent solute leakage. This study investigates the effect of solvent evaporation time (1 to 5 minutes) during the phase inversion fabrication of cellulose acetate (CA) membranes on their physicochemical properties and semi-permeability. The synthesized membranes were evaluated for macroscopic appearance, density, swelling degree, and semi-permeability performance using dextran (100-200 kDa) as a model macromolecule. The results demonstrated that while the macroscopic structures remained uniform, prolonging the evaporation time significantly altered the microscopic morphology. Increasing the evaporation time to 5 minutes maximized the localized polymer concentration, resulting in the highest membrane density (1.55 g/mL) and the lowest swelling degree (17.62%). This highly compact structure provided a superior physical barrier, yielding the most optimal semi-permeability with minimal solute leakage. Furthermore, the application of this 5-minute optimized membrane in a membrane osmometer successfully determined the average molecular weight of dextran to be 122.45 kDa, which perfectly aligns with the theoretical range. The analytical measurement exhibited excellent reproducibility with a coefficient of variation (CV) of 1.8% and an accuracy of approximately 80%. These findings conclusively establish that controlling the evaporation time is a highly effective approach to tailoring the strict selectivity of CA membranes for precise osmometric applications.
Pengaruh Konsentrasi Asam Terhadap Sifat Fisik dan Muatan Permukaan Selulosa Termodifikasi Agus Wedi Pratama; Bambang Piluharto; Dwi Indarti; Tanti Haryati; Hardian Susilo Addy
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.15.2.33756.315-328

Abstract

Selulosa merupakan salah satu biopolimer melimpah yang banyak digunakan dalam berbagai bidang seperti kertas, energi dan material komposit. Hidrofilisitas, dapat diperbaharui, ramah lingkungan dan aman adalah sifat-sifat selulosa yang dapat berpotensi menjadi material maju. Berdasarkan sifat-sifatnya, selulosa dapat dimodifikasi untuk menghasilkan sifat fungsional yang sesuai dengan aplikasinya. Dalam penelitian ini, selulosa mikrokristalin (MCC) dimodifikasi melalui metode hidrolisis asam. Prinsip metode ini adalah penghilangan bagian amorf pada selulosa oleh asam, meninggalkan bagian kristal. Selain itu, ketika asam digunakan sebagai agen hidrolisis, maka akan menghasilkan muatan permukaan pada selulosa. Dalam penelitian ini, pengaruh berbagai konsentrasi asam pada struktur kimia, kristalinitas, morfologi dan muatan permukaan telah dikaji. Perubahan struktur selulosa dianalisis menggunakan Fourier Transform Infra Red (FTIR), kristalinitas menggunakan X-ray Diffraction (XRD), morfologi menggunakan Scanning Electron Microscopy (SEM) dan muatan permukaan menggunakan titrasi konduktomteri. Hasil analisis FTIR menunjukkan masuknya gugus sulfat pada struktur selulosa. Analisis XRD menunjukkan peningkatan kristallinitas dalam selulosa termodifikasi seiring bertambahnya konsentrasi asam. Hasil analisis morfologi menunjukkan partikel dalam selulosa termodifikasi (CM) lebih tersebar daripada MCC. Analisis titrasi konduktometri menunjukkan bahwa mengalami peningkatan muatan permukaan pada CM seiring dengan bertambahnya konsentrasi asam. Oleh karena itu, dapat disimpulkan bahwa pengaruh konsentrasi asam sulfat pada hidrolisis selulosa memberikan dampak yang signifikan pada sifat fisik dan muatan permukaan.Effect of Acid Concentration on Physical Properties and Surface charge of Modified Cellulose. Cellulose is one of abundant biopolymer that many widely used in various applications such as paper, energy and composite material. Hydrophilicity, renewable, biodegradable, and safety are cellulose properties that can became potential of advance materials. In the utilization, cellulose can be modified its properties for different purposes. In this work, microcrystalline cellulose (MCC) was modified by acid hydrolysis method. The principle of this method is removed amorphous region of cellulose by acid and leaving crystalline phase. Moreover, when acid was used as hydrolyzing agent, it produce the surface charge on cellulose. In this research, the effect of various concentration of acid on the chemical structure, crystallinity, morphology and surface charge have studied. The chemical structures were analyzed using Fourier Transform Infra Red (FTIR), crystallinity using X-ray Diffraction (XRD), morphology using Scanning Electron Microscopy (SEM), and surface charge using titration conductometric. The FTIR analysis result has successfully showed the entry of sulfate groups on the cellulose structure. The XRD analysis showed increasing crystallinity in Cellulose Modified (CM) with increase acid concentration. By morphology analysis, particles in CM more disperse than MCC. Analysis of conductometric titration shows that there is an increase in surface charge in CM as acid concentration increases. Thus, the effect of sulfuric acid concentration on hydrolysis of cellulose has a significant impact on physical properties and surface charge.
Co-Authors A Sjaifullah Abdulloh Abdulloh Achmad Sjaifullah Achmad Subagio Achmad Subagio Afif Difa Asy Syafiq, Muhammad Agus Triono Agus Wedi Pratama Ahmad Roziq Ahmad Turidi Ahmad, Zakiyyah Ilma Anak Agung Istri Ratnadewi Ancah Caesarina Novi Marchianti Ancah Caesarina Novi Marchianti Anggia Rose Sukaton Aprilia, Selvina Rizky Apriliasari, Yekti Asnawati Asnawati Asnawati Asnawati Bayu Rudiyanto Busroni, Busroni D. Iwan Setiawan Dafit Ari Prasetyo Dea putri Ismawardani Deltaningtyas Tri Cahyaningrum Deltaningtyas Tri Cahyaningrum Dharmawan, Aditya Dwiki Diah Ayu Nur Sholehah Djamali, R. Abdoel dwi ananda, Tinok Dwi Indarti Dwi Jayanti, Denik Dwi Kusuma Wahyuni Dwiyanti, Inayatus Nur Erix Nurharianto Fatwa, Muhammad Iqbal Firdaus Ubaidillah, Firdaus Firmanto, Hendy HARDIAN SUSILO ADDY Henry Adi Syahputra Sidabutar Hermanto, Toto I Rahmawati Ika Oktavianawati Imam Syafi’i Indarto Indarto Indarto Indarto Intan Rida Agustina Irsyam, Mahrus Istiqomah Rahmawati Iswahyono Iswahyono Iswahyono Iswahyono Karisma Wulan Ningtyas Khofifah, Marhamatul Lulus Kartika Ningtias Mahrus Irsyam Maryanto - Maryanto Maryanto Miftah Hijriawan Moch. Shulthoni, Moch. Mufrihah Nurhayati Muhammad Reza Naning Retnowati Naning Retnowati Nida Andriana Nur Aisyah Nurud Diniyah Nurud Diniyah Purkan Purkan, Purkan Purwo Handoko, Donatus Setyawan R. Abdoel Djamali R. Abdoel Djamali R. Indahsari Riska Rian Fauziah Riska Rian Fauziah S. Purwo Handoko, Donatus Siswoyo Siswoyo Siti Rofiqoh, Siti Sofijan Hadi Sri Sumarsih Sudarko Sudarko, S. Sulistyo, Yudi Aris Sulistyowati, Fitri Syahbanu, Intan Syahrul Khairi Syarifatul Lailah Tanti Haryati Tinok Dwi Ananda Totok Prasetyo Tri Mulyono Tri Mulyono Ula, Mohammad Munal Ummami, Riza Wulandari, Melysa Wuryanti Handayani Yeni Maulidah Muflihah Yudi Aris Sulistiyo, Yudi Aris Yulvia, Ana Zeni Ulma Zulfikar Zulfikar