Claim Missing Document
Check
Articles

Found 17 Documents
Search

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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

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 μm 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

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 μm.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (428.816 KB)

Abstract

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,  cornhusk, mechanical characteristic
ENKAPSULASI KETOPROFEN DENGAN KITOSAN-ALGINAT BERDASARKAN JENIS DAN RAGAM KONSENTRASI TWEEN 80 DAN SPAN 80 Purwantiningsih Purwantiningsih; Napthaleni ,; Mersi Kurniati; Tuti Wukirsari
Makara Journal of Science Vol 14, No 2 (2010): November
Publisher : Directorate of Research and Community Engagement, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Encapsulated Ketoprofen by Chitosan-Alginat based on Type and Variation of Tween 80 and Span 80 Concentration. Ketoprofen has been encapsulated by chitosan-alginate based on types of surfactant and it’s concentration. The variations of concentration either Tween 80 (polietilena sorbitanmonooleat) or Span 80 (sorbitanmonooleat) that used were around (1- 3)% concentrations with stirring around (15-60) minutes. The using of Tween 80 resulted efficiency of encapsulated ketoprofen and nano particle size (100-1000) nm are higher than Span 80.Keywords: encapsulated ketoprofen, chitosan-alginate, Span 80, Tween 80
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1656.86 KB) | DOI: 10.20543/mkkp.v32i1.957

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (403.328 KB) | DOI: 10.14710/reaktor.21.3.103-108

Abstract

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
Formulasi Minuman Kesehatan Ekstrak Jamur Tiram Putih (Pleurotus ostratus) Kaya β-Glukan . Masitoh; Leni Ariyanti; Fitrah Hadi Firdaus; Ade Irma; Erni Apriliana; . Irzaman; Mersi Kurniati; Maya Risanti
Agrokreatif: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 1 No. 2 (2015): Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrokreatif.1.2.96-100

Abstract

Situ Ilir Village located in Cibungbulang Subdistrict, Bogor District, West Java, which has the potential for substantial human resources for the more advanced, unfortunately majority of people's livelihood as traditional farmers. One of the potential contained in this village is oyster mushroom farm. The results of guidance and cooperation of the students of physics IPB like oyster mushroom production training has been carried out in this village, however the marketing less than the maximum. For example many young mushroom or fungus inadvertently severed by farmers to be not worth selling and discarded. By looking at this potential, then came the idea to create a health drink of the oyster mushroom. The aim of this community service are able to give the value of the oyster mushroom selling agricultural products, to increase public knowledge about the benefits of oyster mushrooms, and maximize human resources at Situ Ilir Village. The method used in this training are extension of oyster mushrooms, manufacture of health drinks, and β-glucan analysis using Fourier Transform Infrared (FTIR). This activity resulted in products processed from oyster mushroom as a health drink rich in β-glucan shown from the results of FTIR analysis, that can increase the sale value of the oyster mushroom and enhance the creativity of the human resources in the Situ Ilir Village, Cibungbulang Subdistrict, Bogor District, West Java.
NANOHIDROGEL TAPIOKA MENGGUNAKAN EPIKLOROHIDRIN SEBAGAI AGEN PENGIKAT SILANG Mersi Kurniati, Christina Winarti, Firda Aulya Syamani, Indah Puspita
Jurnal Teknologi Industri Pertanian Vol. 29 No. 2 (2019): Jurnal Teknologi Industri Pertanian
Publisher : Department of Agroindustrial Technology, Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24961/j.tek.ind.pert.2019.29.2.213

Abstract

Natural polymer-based nanohydrogel, like starches, promises superior properties such as more eco-friendly, and cheaper prices because their raw materials are available naturally in abundant quantities compared to synthetic polymers. To obtain synthetic approaching characteristics, natural polymers need to be modified to improve their mechanical stability. Research has been conducted to develop the hydrogel prepared from acid hydrolysed starch for 2 hours and 24 hours. The process of synthesising nanoparticles from hydrolyzed tapioca starch was done through the precipitation of ethanol. Synthesis of nanohydrogel was conducted by crosslinking methods using epichlorohydrin (Ech.) 5, 10, and 20%. Result showed that the particle size of tapioca nanohydrogel ranging from 14.97 – 492.7 nm. The most optimum treatment was nanohidrogel resulted from 2 hours hydrolyzed tapioca with 5% Ech. concentration, resulting swelling power, gel fraction, and texture of  357.02 %, 77,71 %, and 5.61 mJ, respectively. Nanohydrogel is promising material as carrier matrix for agrochemical as well as fertilizer. Keywords : epichlorohydrin, nanohydrogel, tapioca
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1281.081 KB)

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (610.784 KB) | DOI: 10.17146/jusami.2007.0.0.5131

Abstract

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.