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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Teknologi Industri Pertanian Reaktor Jurnal Sains Materi Indonesia Jurnal Matematika & Sains Program Kreativitas Mahasiswa - Penelitian Majalah Kulit, Karet, dan Plastik Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat JOURNAL ONLINE OF PHYSICS Jambura Physics Journal JURNAL Al-AZHAR INDONESIA SERI SAINS DAN TEKNOLOGI PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Makara Journal of Science Jurnal Riset Fisika Indonesia Jurnal Ilmu Kehutanan

Mersi Kurniati

Departemen Fisika, FMIPA-IPB Kampus Darmaga, Bogor

Author-ID : 319800

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Public Health Other

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Penumbuhan Film Tipis Ti1-xCoxO2 Dengan Metode MOCVD Horasdia Saragih; Mersi Kurniati; Akhiruddin Maddu; Pepen Arifin; Moehamad Barmawi
Jurnal Matematika & Sains Vol 9, No 3 (2004)
Publisher : Institut Teknologi Bandung

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The Ti1-xCoxO2 thin films have been successfully deposited on Silicon (Si) substrates by metalorganic chemical vapor deposition (MOCVD). The Ti1-xCoxO2 thin films with x = 0 is grown at deposition temperature of 450oC with argon and oxygen flow rate of 100 sccm and 60 sccm, respectively. The deposited film has a single orientation of (213)-anatase. The films consist of nanometer size of columnar grains. The growth rate was increased with increasing Co content and therefore the grains become larger. Generally, the crystal structure of films was affected by Co atom concentrations, however at temperature deposition of 450oC and argon flow rate of 70 sccm, the film has the initial structure of (213)-anatase and co-exist with (301)-anatase which is not dominant. The film thickness is about of 0,9 Î¼m for an area of 3x3 cm2.

Pengaruh Temperatur Penumbuhan Terhadap Karakteristik Magnetik Film Tipis TiO2:Co yang ditumbuhkan dengan Metode Metalorganic Chemical Vapor Deposition (MOCVD) Horasdia Saragih; Pepen Arifin; Moehamad Barmawi; Mersi Kurniati
Jurnal Matematika & Sains Vol 9, No 4 (2004)
Publisher : Institut Teknologi Bandung

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TiO2:Co thin films have been grown on p-type Si(100) substrates by MOCVD method. The films were grown at substrate temperature of 450 oC to 500 oC , and the temperature of precursor bubbler was kept constant at 50 oC with vapor pressure of 260 Torr. Flow rate of O2 and Ar are 60 sccm and 100 sccm, respectively. The crystal structure, grain shape and magnetic properties of the films depend significantly on the substrate temperature. The anatase-213 structure with columnar grain was formed for the films grown at temperatures of 400 oC and 450 oC. The arrangement of atoms at grain boundary is improved at growth temperature of 450 oC. Anatase-301 structure with cone grain shape as additional component appears at growth temperature of 500 oC. The TiCoO3 phase with 310 plane was found at growth temperature of 550 oC. The grains grow at direction of -45o from normal substrate. Films that grown at 450 oCand 500 oC exhibit soft magnetic properties with Hc of 100 Oe and 80 Oe; and Mr of 250 emu/cm3 and 220 emu/cm3, respectively. The hard magnetic properties of the films are shown for the films grown at 550 oC. The films were grown for 2 hours producing the films with thickness of about 0.7 to 0.9 Î¼m.

KARAKTERISASI MEKANIK BIOKOMPOSIT KLOBOT JAGUNG SEBAGAI BAHAN DASAR PLASTIK BIODEGRADABLE Dirgantara, Made; Saputra, Miko; Khalid, Muhammad; Wahyuni, Eni Septi; Kurniati, Mersi
Program Kreativitas Mahasiswa - Penelitian PKM-P 2013
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

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The corn production in Indonesia, based on the data from Badan Pusat Statistik in 2012, amounted to 19.73 million tons, the cornhusk from the corn crop is about 38.38%. The utilization of cornhusk itself has not been maximized yet, so the research to maximize the utilization of cornhusk is required. The research has been made biocomposites cornhusk and Linear Low Density Polyethylene (LLDPE) with hot press method. Biocomposites made with the variation of cornhusk:LLDPE are 30:70, 40:60, 50:50, 60:40, 70:30, and it is characterized of the mechanical characteristics (tensile and tear) with Universal Testing Machine (UTM), biodegradation in a qualitative manner. Mechanical analysis showed the mechanical characteristics decrease with the addition of cornhusk concentration on biocomposites, and concentration 30:70 has the highest mechanical characteristics with tensile strength 24.77 MPa, elongation 19.10% and tear strength 53.94 N/mm. The result is contrast with the biodegradable analysis in which the bigger concentration cornhusk then the level of biodegradability is higher.Keywords: biocomposites, biodegradable,Â cornhusk, mechanical characteristic

Efektivitas karet alam termoplastik sebagai peningkat indeks viskositas minyak pelumas kendaraan Puspitasari, Santi; Arifianto, Muhammad Lutfi; Kurniati, Mersi
Majalah Kulit, Karet, dan Plastik Vol 32, No 1 (2016): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Diversification of rubber goods are highly needed to enhance natural rubber domestic consumption. One of the efforts is by using thermoplastic natural rubber that is synthesized from emulsion graft copolymerization of natural rubber latex with thermoplastic monomer as index viscosity improver of lubricating oil. The research aimed to study the effect of thermoplastic natural rubber (natural rubberâstyrene copolymer) addition, at various concentration, into base paraffinic lube oil (HVI 60 and HVI 650) on index viscosity value of lubricating oil. The result showed that emulsion graft copolymerization at composition ratio of natural rubber to styrene monomer 85:15, at 65oC for 7 hours, with addition of 1% ammonium peroxidisulfate as initiator and 2% sodium dodecyl sulfate as surfactant produced thermoplastic natural rubber (TPNR, copoly NR-ST) with grafting efficiency of 56,48%. The TPNR can be functioned properly as index viscosity improver at 5% concentration to base paraffinic lube oil either HVI 60 or HVI 650. The obtaining new lubricating oils could fulfill the index viscosity standard requirement refered to Decree of Directorat General of Oil and Gas No 85K/34/DDJM/1998, and could compete with the commercial lubricating oil type 20W-50, 10W-40, and 15W-40.

Pengembangan Teknologi Proses Produksi Bionanokomposit Filler Biomassa Rotan Siti Nikmatin; Lisdar Idwan Sudirman; Mersi Kurniati
Jurnal Ilmu Pertanian Indonesia Vol. 19 No. 3 (2014): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Rattan biomass is a fiber waste from processing industry of rattan. Its abundant availability, as well as does not threaten the balance of food and feed, make it a potential source as raw material for composite filler of cellulose nanoparticles. To obtain a high cellulose content, it was inoculated with White rote fungi and Aspergillus niger. The experiments were conducted at inoculation time of 15, 21, and 30 days. The results showed that biomass of rattan extracted with White rote fungi and Aspergillus niger reached maximum cellulose content at the inoculation time of 21 days ie 76.47% cellulose, lignin 2.39%, and 20% moisture content. Cellulose has a monoclinic crystal structure, a =7.87; b=10.31; c=10.13 α= γ = 90, β=120. Nanoparticles were produced by disk mill-hummer mill method with variation milling time of 15, 30, and 45 minutes. Collision, friction, and heat for 30 minutes of milling could produce energy that was transferred to the particles and caused cavitation which resulted particles of 16.22-51.30 nm particle size. Production of test piece and prototype of nanocomposite using TSE and injection molding produced material which has 2 phases of crystal structure, namely monoclinic, and orthorhombic phases. The mechanical properties of impact strength was 67.769 J/m and hardness of 79.97 HRR. Thermal properties and density of bionanokomposit showed comparable values with synthetic composites.

EFEK KONDISI PEMBASAHAN DALAM PEMBENTUKAN NANOSFER BERBASIS OKSIDA BESI DAN PLA Sonny Affandi; Mujamilah Mujamilah; Mersi Kurniati; Sudaryanto Sudaryanto
Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2007
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

EFEK KONDISI PEMBASAHAN DALAM PEMBENTUKAN NANOSFER BERBASIS OKSIDA BESI DAN PLA. Nanosfer berbasis oksida Fe dan PLA telah dibuat dengan memvariasikan parameter kondisi pembasahan (wetting process parameter). Parameter yang divariasikan meliputi kecepatan proses pengadukan dan kekentalan larutan pembasah. Hasil karakterisasi SEM menunjukkan adanya kecenderungan ukuran partikel yang makin kecil dengan naiknya kecepatan adukan dan makin homogen dengan menurunnya kekentalan larutan. Identifikasi fasa pada pola difraksi sinar-X menunjukkan tetap terbentuknya fasa kristalin Fe3O4/γ-Fe2O3 dan PLA sampai batas parameter proses yang digunakan. Namun demikian, hasil pengukuran sifat magnetik dengan VSM menunjukkan belum optimalnya pengisian serbuk magnetik dalam sistem nanosfer sehingga nilai magnetisasinya masih rendah. Dari rangkaian proses yang telah dilakukan nanosfer yang dapat dibuat mempunyai ukuran terkecil pada kisaran 500 nm dan nilai magnetisasi tertinggi 7,27 emu/gram.

Efektivitas karet alam termoplastik sebagai peningkat indeks viskositas minyak pelumas kendaraan Santi Puspitasari; Muhammad Lutfi Arifianto; Mersi Kurniati
Majalah Kulit, Karet, dan Plastik Vol 32, No 1 (2016): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Diversification of rubber goods are highly needed to enhance natural rubber domestic consumption. One of the efforts is by using thermoplastic natural rubber that is synthesized from emulsion graft copolymerization of natural rubber latex with thermoplastic monomer as index viscosity improver of lubricating oil. The research aimed to study the effect of thermoplastic natural rubber (natural rubber–styrene copolymer) addition, at various concentration, into base paraffinic lube oil (HVI 60 and HVI 650) on index viscosity value of lubricating oil. The result showed that emulsion graft copolymerization at composition ratio of natural rubber to styrene monomer 85:15, at 65oC for 7 hours, with addition of 1% ammonium peroxidisulfate as initiator and 2% sodium dodecyl sulfate as surfactant produced thermoplastic natural rubber (TPNR, copoly NR-ST) with grafting efficiency of 56,48%. The TPNR can be functioned properly as index viscosity improver at 5% concentration to base paraffinic lube oil either HVI 60 or HVI 650. The obtaining new lubricating oils could fulfill the index viscosity standard requirement refered to Decree of Directorat General of Oil and Gas No 85K/34/DDJM/1998, and could compete with the commercial lubricating oil type 20W-50, 10W-40, and 15W-40.

The Effect of Variation of Raw Material Ratio on Hydrogel Based on K-Carrageean - Acrylamide as a Carrier of Ammonium Nitrate Fertilizer Hendrawan Laksono; Mersi Kurniati; Yessie Widya Sari; Christina Winarti
Reaktor Volume 21 No. 3 September 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Hydrogels based on natural polymers such as carrageenan are currently being developed to improve efficiency in agriculture. By enriching hydrogels with fertilizers, they will be released slowly into the soil. Enrichment of fertilizers on carrageenan-based hydrogels was carried out and analyzed with the response of swelling ability, gel fraction value of grafting degree, to the hydrogel's ability to release the fertilizer trapped in it. Carrageenan is used because its use as a natural polymer has not been widely explored, especially in the non-food sector. The results showed that the average swelling value of carrageenan-based hydrogel to ammonium nitrate solution ranged from 750.00% - 1,633.33%. The gel fraction values obtained ranged from 74.06% to 87.51%, and the degree of grafting ranged from 85.33% to 93.59%. These values indicate a relatively high degree of tissue density and grafting of acrylamide monomer on carrageenan, which means that the carrageenan:AAm based hydrogel has strong mechanical properties. The ability to release ammonium nitrate samples from the hydrogel carrageenan-based has a value ranging from 8.86% to 44.92% in five days of observation. Interpretation of the test results, the best ratio of carrageenan:AAm is 1:1, due to its relatively low release value but still has good swelling and mechanical properties.Keywords: Hydrogel; Carrageenan; Acrilamyde; Fertilizer release

The Release of Fertilizer on Corncob Cellulose – Based Acid-Acrylamide Hydrogel Prepared by Chemical Cross-Binding Method Renda Amalia Anggraini; Mersi Kurniati; Christina Winarti; Irmansyah Irmansyah
Reaktor Volume 21 No. 3 September 2021
Publisher : Dept. of Chemical Engineering, Diponegoro University

Farmers' knowledge of the amount and dosage of fertilizers recommended for a practical fertilization system is low. As the result, the plant does not fully absorb the given fertilizer. Some fertilizers are leached by the flowing water and wasted into the soil layer. In long term basis, this practice can cause environmental pollution, especially on the land, water and air. Due to this fertilization problem in agriculture practice, a material with a high-water absorption capacity, which further releases it together with the fertilizer over a desirable period of time, is needed. One way to effectively provide water and nutrients to the plants and improve the physical and chemical properties of the fertilizzer is by the application of hydrogel. In this work, the release of urea fertilizer in a hydrogel-based on corncob cellulose was prepared using N, N'-Methylene Bis-acrylamide (MBA) as a crosslinker was studied. This research aims to produce a hydrogel with good physical and mechanical properties using acrylamide based on corn cobs cellulose and can be applied as a fertilizer carrier matrix whose structure can regulate fertilizer release. The treatments tested were MBA concentrations of 0%, 1%, and 2%, while the ratio of cellulose: solvent was 1: 2 and the addition of urea fertilizer with a concentration of 5%. The results showed that the swelling value increased with increasing acrylamide in the treatment ratio of the concentration of cellulose: acrylamide-acrylamide (NS: AAm). Fertilizer factors also gave a good swelling value. This shows that the addition of fertilizers gives maximum results. The hydrogel with the best treatment, namely the concentration ratio of 1% MBA, produced a swelling value of 7633.3%, a gel fraction of 76.51%, 1.73 miligram fertilizer loading, fertilizer release by 2.9%, a hardness of 7,865 N, with the morphology showing urea crystals in the form of white spots and showing the results of a slow but optimum release rate of fertilizer so that it can be applied for agriculture that requires a lot of nutrients at the beginning of growth.Keywords: corncorb; cellulose; hydrogel; N’,N’-Methylene Bis-acrylamide (MBA), slow released fertilizer

SIFAT FISIK DAN MEKANIK PAPAN PARTIKEL DARI AMPAS JARAK KEPYAR Mersi Kurniati, Ika Amalia Kartika, Farah Fahma, Titi Candra Sunarti, Kaswar Syamsu, Dede Hermawan T
Jurnal Teknologi Industri Pertanian Vol. 24 No. 2 (2014): Jurnal Teknologi Industry Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

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ABSTRAK The castor cake meal was a by-product of castor oil production and its has recently been highly rated as a source of raw material for particle board, because beyond its high protein content (32-48%) and fibre (28-33%). The objective of this research was to produce and investigate the physical and mechanical properties of the particle board from castor cake meal. Particle board samples were manufactured using hot pressing temperatures (150-1900C), pressing time (4-12 minutes), compressed using a pressure (140-220 kg/cm2) with particles size of 20-100 mesh. The central composite design (CCD) method and ANOVA (α=0.05) with response surface method (RSM) were used to evaluate production of the particle board. The physical and mechanical properties of particle board were determined based on Japanese Industrial Standards, JIS A 5908-2003 type-8. The experimental results showed that the pressing process conditions affected the physical and mechanical properties of particle board. The particle size were significant factor for moisture content, density, water absorption and thickness swelling, pressing temperature were significant factors for modulus of elasticity,modulus of rupture and internal bonding of particle board. The smaller particle size (20 to 60 mesh) and the higher pressing temperature (150 to 1700C), increased moisture content, density, modulus of elasticity, modulus of rupture, and bonding strength and decreased water absorption and thickness swelling of particle board. Physical and mechanical properties obtained from the best process conditions at a temperature of 1700C, time of 8 minutes, pressure of 180 kgf/cm2 and 60 mesh particle size. Based on the overall results, the physical and mechanical properties of particle board did not met requirement of the JIS A 5908-2003 except for moisture content, density and internal bonding. Keywords: castor cake meal, particle board, modulus of elasticity,modulus of rupture, internal bonding

Co-Authors . Masitoh . Mursyidah Abu Sonip Ade Irma Akhiruddin Maddu Akhrudin Maddu Ana Fitriana Aprilianda, Aprilianda Arifianto, Muhammad Lutfi Budiman, Ismail Christina Winarti Christina Winarti Christina Winarti Christina Winarti Eni Septi Wahyuni Erni Apriliana Erni Aprilina Esti Prihatini Fitrah Hadi Firdaus Fitrah Hadi Firdaus Hendrawan Laksono Horasdia Saragih Indah Puspita Indah Puspita, Indah Irlian Nurmaniah Irmansyah Irmansyah Irzaman, Irzaman Istie Rahayu jumardin jumardin Leni Ariyanti Lisdar Idwan Sudirman Lusia Anita Boru Sagala Lusia Anita Br. Sagala Made Dirgantara Maya Risanti Maya Risanti Miko Saputra Moehamad Barmawi Muhammad Khalid Muhammad Lutfi Arifianto Mujamilah Mujamilah Napthaleni , Napthaleni, Napthaleni Pepen Arifin Purwantiningsih Sugita Puspitasari, Santi Rahmaniah Nalwi Rahmaniah Nalwi Renda Amalia Anggraini Santi Puspitasari Siti Nikmatin Sonny Affandi Sudaryanto Sudaryanto Tuti Wukirsari Tuti Wukirsari Yessie Widya Sari

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