Hariyati Purwaningsih
@its.ac.id
Material Engineering Department
EDUCATION
Ph.D in Chemical Engineering
Master degree in Physical Material
bachelor degree in Physics
RESEARCH, TEACHING, or OTHER INTERESTS
Materials Science, Ceramics and Composites, Electronic, Optical and Magnetic Materials, Materials Chemistry
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Hariyati Purwaningsih, Ni Made Intan Putri Suari, Widiyastuti Widiyastuti, and Heru Setyawan
American Chemical Society (ACS)
We report the preparation of manganese dioxide (MnO2) nanoparticles and graphene oxide (GO) composites reduced by an electrophoretic deposition (EPD) process. The MnO2 nanoparticles were prepared by the electrolysis of an acidic KMnO4 solution using an alternating monopolar arrangement of a multiple-electrode system. The particles produced were γ-MnO2 with a rod-like morphology and a surface area of approximately 647.2 m2/g. The GO particles were produced by the oxidation of activated coconut shell charcoal using a modified Hummers method. The surface area of the GO produced was very high, with a value of approximately 2525.9 m2/g. Fourier transform infrared spectra indicate that a significant portion of the oxygen-containing functional groups was removed from the GO by electrochemical reduction during the EPD process after sufficient time following deposition of the GO. The composite obtained by the EPD process was composed of reduced graphene oxide (rGO) and γ-MnO2 and exhibited excellent electrocatalytic activity toward the oxygen reduction reaction following a two-electron transfer mechanism. This approach opens the possibility for assembling rGO composites in an efficient and effective manner for electrocatalysis.
Vania Mitha Pratiwi, Lukman Noerochiem, Widyastuti, Hariyati Purwaningsih, Diah Susanti, and Fakhri Akbar Maulana
AIP Publishing
Diah Susanti, Yeny Widya Rakhmawati, Lukman Noerochim, Hariyati Purwaningsih, and Haniffudin Nurdiansah
AIP Publishing
Hariyati Purwaningsih, Widiyastuti Widiyastuti, and Heru Setyawan
AIP Publishing
András Bartos, Kristóf Nagy, Juliana Anggono, Antoni, Hariyati Purwaningsih, János Móczó, and Béla Pukánszky
Elsevier BV
A. Purniawan, D. A. K. Hapsari, and H. Purwaningsih
AIP Publishing
Boiler generates heat from combustion and transfers to change the water to steam phase. The boiler consists of several components, one of them is superheater tube. High temperature corrosion often attacks the superheater tube material causes material failure. This study aims to deposit Ni-Al and Ni-20Cr on AISI 4140 using twin wire arc spray method as barrier coating. Gas pressure during process was varied of 3 bar, 4 bar, 5 bar, and 6 bar followed by annealing to reduce porosity of the coating product. Characterization to investigate the morphology of the coating surface using SEM shows that the increase pressure causes small surface particles that affects to decrease porosity. Porosity at pressure 3 bar is 15.43% while at pressure 6 bar is 10,35%. In addition, the annealing process has contribution to reduce the porosity till 3% for pressure 6 bar. The hardness of the coating is also influenced by the pressure and the annealing process.
András Bartos, Juliana Anggono, Ágnes Elvira Farkas, Dávid Kun, Felycia Edi Soetaredjo, János Móczó, Antoni, Hariyati Purwaningsih, and Béla Pukánszky
Elsevier BV
Haniffudin Nurdiansah, Rena Eka Firlyana, Diah Susanti, and Hariyati Purwaningsih
IOP Publishing
Abstract Nowadays the growth of the textile industry in Indonesia is increasing. An example of dangerous textile waste is Rhodamine-B. Therefore, a method to treat Rhodamine B waste is needed. One method that can be used is photocatalysis. ZnO and TiO2 semiconductors are known as good photocatalyst material because they have a small band gap energy. In addition, reduced graphene oxide (rGO) has a potential due to its good conductivity and large surface area. This study aims to synthesize ZnO/rGO/TiO2 composite. Analysis of the composite shows peaks correspond to diffraction pattern of ZnO, TiO2, and rGO. Based on scanning electron microscope analysis, the surface morphology of the composite was in the form of sheets (rGO), agglomerates (TiO2), and hexagonal nanorod (ZnO). Further confirmation by EDX analysis shows elemental compositions of Zn, Ti, O, C (18.44, 7.44, 46.01, 28.11, respectively). FTIR analysis resulting in bands of C-O at 998 cm−1, Ti-O-Ti at 506 cm−1, and Zn-O at 497 cm−1. Photocatalysis test using the composite gave the optimum value of Rhodamine-B degradation of 94.72 % under UV light irradiation for 5 hours.
Widiyastuti, Heru Setyawan, Mahardika F. Rois, Hariyati Purwaningsih, and Puspita Nurlilasari
IOP Publishing
Abstract Manganese dioxide nanoparticles have been successfully synthesized by the electrolysis method using 4-pairs carbon electrode in the alternating monopolar arrangement. The advantage of the arrangement is a significant increase in the product yield compared to the single pair electrodes. KMnO4 solution in pH 0.2 and 9 were used as precursor and electrolyzed for thirty minutes at a temperature of 60 °C. The generated particles resulted from electrolysis in pH 0.2 (MnO2-A) and in pH 9 (MnO2-B) were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and nitrogen adsorption-desorption isotherms to examine their crystallinity, morphology, and the specific surface area. The α-MnO2 was observed for MnO2-A particles and amorphous for MnO2-B particles. The particles size of MnO2-A was larger than that of MnO2-B with the specific surface areas of 396 and 98 m2/g, respectively. The higher surface area of MnO2-A corresponding to the channel pore of short rod-like morphology. On the other hand, MnO2-B contributed to the spherical particles. The measurements of cyclic voltammetry (CV) were also carried out to measure their specific capacitances and their performance for oxygen reduction reaction (ORR) electrocatalyst. MnO2-A exhibited higher specific capacitance of 13.57 F/g compared to MnO2-B that only had 3.62 F/g. In addition, MnO2-A also gave better performance as ORR electrocatalyst measured in O2-saturated 0.6 M KOH resulted in 2.69 transferred electron number per oxygen molecule.
Agung Purniawan, Peter Andreas Timotius, Hariyati Purwaningsih, Sigit Tri Wicaksono, and Amaliya Rasyida
American Scientific Publishers
Mg-alloy has possibility to be used as biodegradable biomaterial. The main problem in application of this material is high degradation rate. The aim of this research is to study the mechanical, morphology and the degradation properties of Mg-alloy biodegradable by variation of sintering temperature of 500 °C, 550 °C, and 600 °C. Morphology was investigated using SEM-EDX. Phase identification was carried out by XRD and mechanical qualities test was measured by compressive and hardness test. Degradation rate test was assessed by weight loss test. The outcomes show that Mg–Zn– Cu sample with sintering temperature 600 °C is the optimum result. The compressive strength is 175,14 MPa, the hardness value is 410,59 MPa, and degradation rate is 8,57 cm/year.
Juliana Anggono, Bily Budiarto, Suwandi Sugondo, Hariyati Purwaningsih, and Antoni
Trans Tech Publications, Ltd.
There are more than 1000 species of cellulose plants available in fiber form. A number of them are by-products from the major food crops contain lignocellulosic sources and being investigated as composite reinforcement materials. Sugarcane bagasse and rice husk are potential reinforcement materials and they were used to reinforce polylactic acid (PLA) matrix to make green composites. In this research work, sugarcane bagasse was given two different kinds of treatment; some were alkali treated using 8 wt.% NaOH at room temperature for an hour and some other were steam treated at 0.75 MPa for 30 minutes. The fiber content of the composites changed with weight percentage ratios of sugarcane bagasse/rice husk/PLA was 25/0/75, 25/5/70 and 25/10/65. Flexural strength was tested in accordance with ASTM D790-17 and structural evaluation was evaluated using scanning electron microscope (SEM) on the fracture section of the flexural test samples. Composites produced using steam treated sugarcane bagasse and rice husk have lower area density (1277-1385 g/m2) compared to the ones formed using NaOH treated bagasse and rice husk (1162-1500 g/m2). Both values of area density are below the density of neat PP and wood flour reinforced PP/PE composites used as reference materials. The flexural test shows the NaOH treatment on the bagasse fibers improve the flexural strength of the composites but the rice husk content introduced to the structure reduces the strength of the composites. SEM evaluation shows fiber fracture and few pull-out.
Juliana Anggono, Hariyati Purwaningsih, Suwandi Sugondo, Steven Henrico, Sanjaya Sewucipto, and Jay Patel
EDP Sciences
Greater interest in recent years to the increase demand in using natural fiber reinforcement of polymers is to comply with the increasing stringent international protocols related to climate change and environmental awareness. Many studies have reported the development of renewable and biodegradable agricultural by-products as reinforcement fibers for biocomposites. One of the essential factors in producing strong biocomposites is the properties prepared from the natural fibers which results from the alkalitreatment given. This research aims to evaluate the effect of different treatment duration on structural changes on sugarcane after alkali treatment using sodium hydroxide (NaOH) and calcium hydroxide (Ca(OH)2) solutions. Calcium hydroxide was used as comparative solution in search for milder and more environmental friendly alkali solution as an alternative solution of NaOH. Fourier Transform Infrared (FTIR) confirmed the major removal of lignin and minor of hemicellulose. It shows that the structure did not change considerably with the additional treatment time. The weight loss measurement after each treatmentshows a higher weight loss with the treatment with NaOH (40.5 % to 57.75 %) than the weight loss after Ca(OH)2treatment (25 % to 46 %). Scanning electron microscope (SEM) observed the morphology changes onthe fiber from both treatments.
Diah Susanti, Yurian Ariandi Andrameda, Haniffudin Nurdiansah, Hariyati Purwaningsih, Yusuf Pradesar, and Hosta Ardhyananta
IOP Publishing
Abstract The increase of human needs to electronic instruments requires sufficient energy storage devices. One of the electrochemistry-based energy storage devices is electrochemical capacitor (EC). The challenge in EC manufacturing is to prepare ECs with high energy and power densities. It depends very much on the ECs material. In this research, graphene, theoretically a single layer of carbon material, was used as the material for electrical double layer capacitor (EDLC), a type of ECs. To enhance the electrical conductivity, graphene was doped with boron using 1 M H3BO3 (boric acid) with volume variations of 1, 2, and 3 ml. X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-Ray Spectroscopy (EDXS) were used to characterize the structure, morphology and element content of the material. Four Point Probe (FPP) method was used to measure the materials electrical conductivity, while Cyclic Voltammetry (CV) measurement was used to inspect the capacitive properties of the material in 1 M Na2SO4 electrolyte solution. The best result, 192.5 F/g, was found from B-doped graphene with 2 ml volume of boric acid (equivalent to 4.37 %B). From this experiment, boron doping significantly improved the capacitive properties of graphene-based EDLC.
B Purnawira, H Purwaningsih, Y Ervianto, V M Pratiwi, D Susanti, R Rochiem, and A Purniawan
IOP Publishing
Abstract Rice husk contains silica up to 86.9-97.3%, it potentially as precursor silica in the synthesis process of mesoporous silica MCM 41. First, use acid leaching as pre-treatment of rice husk extraction, followed by heat treatment at 600°C in the furnace, continued with sol-gel process to get amorphous silica. Mesoporous silica was synthesizing using CTAB as surfactant to assist porous of silica MCM 41 (CTAB-templated silica). CTAB concentration were 1, 1.25 and 1.5%. Mesoporous silica nanoparticle MCM 41 synthesized by sol-gel method, followed by hydrothermal and reflux methanol + HCl. X-ray diffraction pattern showed that silica has amorphous liked-structure, indicated by peak broadening at 2-theta around 22-24°. Fourier Transformed Infrared-FTIR shown functional group of Si-O, Si-O-H, Si-O-Si, -OH, Si-H, and Si-OH bond have been identified. Scanning electron microscope (SEM) shown particle agglomeration and particle sizes range between 311-482 nm. The desorption adsorption nitrogen analysis (BET analysis) showed that surface area and pore diameter at 1%, 1.25% and 1.5% CTAB have surface area 552.429 m2/g, 768.947 m2/g and 705.501 m2/g. In hence pore diameters are 3.4178 nm, 3.0517 nm and 3.4098 nm respectively.
Lukman Noerochim, Rais Fikry, Haniffudin Nurdiansah, Hariyati Purwaningsih, Achmad Subhan, Joko Triwibowo, and Bambang Prihandoko
Springer Science and Business Media LLC
Juliana Anggono, Ágnes Elvira Farkas, András Bartos, János Móczó, Antoni, Hariyati Purwaningsih, and Béla Pukánszky
Elsevier BV
Haniffudin Nurdiansah, Diah Susanti, Rena Eka Firlyana, and Hariyati Purwaningsih
Trans Tech Publications, Ltd.
The growth of the textile industry in Indonesia has resulted in increased textile dye waste production. Rhodamine B is one of the dyes that are often used in the textile industry. The use of these dyes will cause serious environmental and biological problems, even able to induce irritation of the skin and eyes. Thus, it is necessary to filter dyes from the textile industry waste in Indonesia. Some conventional methods for removing Rhodamine B are carried out by biochemical and physical-chemical methods, such as liquid membranes, ozonation and adsorption, but this method requires expensive and not very effective costs. One alternative method that can be applied in Indonesia is photocatalysts. Photocatalytics are processes where light and catalyst are simultaneously used to accelerate chemical reactions. In this study, the photocatalyst used was semiconductor material ZnO and TiO2 with the addition of rGO. rGO synthesis was carried out using the Hummer method, for the synthesis of ZnO using Zinc powder as a precursor, and the synthesis of TiO2 using precursor of TiCl3. This study was conducted to analyze the effect of adding 5%, 10%, and 15% rGO to the photocatalytic properties of ZnO / rGO / TiO2 composites for degradation of Rhodamine B. The characterization process carried out in this study included XRD, SEM & EDX, FTIR, and photocatalytic testing. Photocatalyst materials ZnO / rGO / TiO2 with variations in the amount of rGO were synthesized as evidenced by XRD testing, where there was a peak for all three component, SEM, shows the morphology of Zn in the form of hexagonal nano rod, rGO in the form of transparent sheets and TiO2 in the form of agglomerated balls. From FTIR testing, rGO and TiO2 functional groups were seen. The highest efficiency for degradation of Rhodamine-B was obtained for the addition of 15% rGO with a 5-hour irradiation time, ie its efficiency reached 96.92% in degradation of Rhodamine B.
Vania Mitha Pratiwi, Agung Ari Wibowo, Widyastuti, Hariyati Purwaningsih, and Fakhri Akbar Maulana
Trans Tech Publications, Ltd.
An alternative sensor that can be used to monitor Nitrogen Oxide (NOx) levels in the air is an electrochemical sensor type such as Sodium Super Ionic Conductor (NASICON). In this study titanium doping on zirconium was carried out to improve the electrical conductivity of NASICON. This material was synthesized using the solid state method by mixing sodium carbonate, silicon dioxide, zirconium oxide, ammonium dihydrogen phosphate, titanium dioxide and some anhydrous ethanol into the Ballmill for 12 hours, dried at 80 °C for 12 hours then calcined at 1125 °C for 12 hours with heating rate of 2 °C.min-1. Then the material was pressed at 160 MPa to produce pellets with diameter of 10 mm and the sintering process was carried out at 1175 °C for 12 hours at a speed of 1 °C.min-1. The doping of Titanium was varied from 0 to 6 mol%. The XRD characterization results indicate that the formed material phase was monoclinic phase and rhombohedral phase. The most optimal electrical conductivity of 5.897x10-5 S.cm-1 was obtained by Titanium doping of 6 mol%.
Hariyati Purwaningsih, Slamet Raharjo, Vania Mitha Pratiwi, Diah Susanti, and Agung Purniawan
Trans Tech Publications, Ltd.
Rice became the main product of agriculture in agrarian countries including Indonesia. Rice husk is a waste of rice as one of the largest silica producers. Silica from rice husks can be used as a source of silica in the manufacture of sodium silicate as an alternative to the formation of mesoporous silica at a low price. In this research, the characterization of mesoporous silica nanoparticle (MSN) MCM-41 from rice husk (rice husk) with sol-gel method followed by hydrothermal treatment. Silica extraction was performed by titrating sodium silica using HCl method until the gel was formed. The mesoporous synthesis was performed with the addition of CTAB. The titration is then carried out using a solution of acetic acid. XRD shows silica with an amorphous structure. The FTIR results show that extraction silica and MSN MCM-41 contain pure silica displayed with Si-O-Si functional groups in the sample. The SEM results show MSN MCM-41 images such as a coral-like structure of agglomerated silica and the higher temperature hydrothermal treatment then it would be the more large size of particles. The material has a hexagonal pore structure such as a honeycomb as characteristic of MCM-41 with a pore size of 2.535 nm which includes mesoporous material. The result of nitrogen adsorption-desorption isotherms shows lower hydrothermal temperature will increase the specific surface area and decrease average pore size, where the best result with surface area value is 825.365 m2/gr and average pore size is 6.10426 nm obtained from process hydrothermal at 85°C.
R A Yuniar, W Widiyastuti, H Setyawan, H Purwaningsih, S Machmudah, and D Anggoro
IOP Publishing
Abstract Carbon fibres are important materials due to their excellent properties. Carbon fibres were formed by blending Poly(vinyl alcohol) (PVA) and a high conductivity material of Acetylene black (AB). Electrospinning technique was used to fabricate PVA and AB solutions in demineralized water. Electrospinning is an efficient technique for the formation of polymer nanofibers. The effects of solution concentration and AB contents on morphological appearance and diameter of those as-spun fibres were investigated by scanning electron microscopy (SEM). Iodine treatment on the fabricated PVA/AB composite was successfully achieved in order to build up the carbonization process and retained their original fibrous structure. The mass of iodinated nanofibers at 80 °C for 24 h increased about 130 %. The mechanism of iodine uptake by electrospun PVA/AB fibres have been obtained by thermal behaviour and its morphological characteristics. It was found that iodine treatment played an important role in changing the morphological structure during the carbonization process. With the iodine treatment of PVA/AB precursor fibres successfully converted into thin carbon fibres and SEM analysis confirmed that the diameter of fibres was about 290 nm. The resulted pure fibres and iodine treatments show guarantee for production carbon fibres.
Hariyati Purwaningsih, Yohan Ervianto, Vania Mitha Pratiwi, Diah Susanti, and Agung Purniawan
IOP Publishing
Rice husk is an agricultural waste that potentially produces high-purity amorphous silica as the source of the precursor of mesoporous silica MCM-41. To obtain pure silica, acid leaching was applied to the rice husk followed by heating treatment in the furnace and synthesized by a sol-gel technique to produce amorphous silica. In this research, mesoporous silica MCM-41 were synthesized by a sol-gel technique assisted by CTAB as a template, then titrated with acetic acid and hydrothermal in the teflon line-autoclave. Various CTAB concentrations were applied as the research variable parameters. X-ray diffraction pattern shows that silica has an amorphous-like curve. FTIR data showed the presence of Si-O-Si function groups in the sample. SEM results showed coral reefs-microstructure with the particle sizes about 243 - 482 nm. TEM image showed the porous structure on the silica surface and formed a hexagonal structure mcm-41. The diameter of the shaft was 3.13 - 3.58 nm, hence the resulted silica material is classified as mesoporous material.
Christina E. Mediastika, Luciana Kristanto, Juliana Anggono, Fefen Suhedi, and Hariyati Purwaningsih
Informa UK Limited
ABSTRACT For buildings in tropical climates, the use of open windows for natural ventilation can not only provide low cost and low energy comfort but also provide thermal delight for occupants. However open windows let in environmental noise. The size and location of windows in walls are key but this study set out to determine whether there are any window forms that can effectively reduce the level of sound ingress into a building. A top-hung window was chosen for this study looking at the dimensions of the window opening and its orientation in relation to the environmental noise source. The top-hung form was selected for its potential to balance the functions of allowing airflow while potentially blocking and reducing noise levels with its window pane angle. The window pane was tested in a laboratory at three opening angles: 0° (closed), 5°, and 10° to let the outdoor air in. The angles were also tested in three different orientations in relation to the noise source position: perpendicular, sideways 60°, and sideways 90°. The test was conducted at 1/3 octave band frequency as specified by ASTM E90-09 to obtain the transmission loss, then ASTM E1332-90 was referred to calculate the outdoor-indoor transmission class (OITC) of the specimens. The study revealed that window orientation and extent of the openings and window pane angle have little effect on noise reduction. The paper concludes with a discussion of how higher levels of natural ventilation can be achieved, particularly in noisy urban areas. The top-hung window, once open, barely blocks environmental noise. However, when the window was closed, the perpendicular orientation offered more noise reduction when compared windows placed sideways to the noise source. The adjustable pane-angle of a top-hung window placed perpendicular to the airflow, and thus the noise source, seemed to have the most potential to balance the functions of allowing airflow when opened and reducing significant noise when closed. Nonetheless, an open window that through its design alone can significantly reduce the ingress of ambient noise into a building is still an issue.
L. Noerochim, M. A. T. Indra, H. Purwaningsih, and A. Subhan
IOP Publishing
In this work, Fe2O3 was successfully synthesized by the hydrothermal process at low temperature. FeCl3.6H2O as precursor and variation of lysine as hydrolyzing agent were used to preparing Fe2O3. SEM images show that the morphology of Fe2O3 is porous microsphere with sizes in the range of (1 to 5) µm in diameter. The as-prepared Fe2O3 with the 2 M of lysine exhibits excellent cycling performance when used as the anode for lithium ion batteries, obtaining reversible discharge capacity of 172.33 mA·h·g−1 at 0.5 C after 50 cycles. It is attributed to the unique structure of porous microspheres providing a large surface area which maintains good electronic contact between particles during charge-discharge process. This result demonstrates that Fe2O3 porous microsphere has a high potential as anode material for application of lithium-ion battery.
A. Purniawan, H. M. Maulidiah, and H. Purwaningsih
Author(s)
A. Purniawan, R. Hermastuti, H. Purwaningsih, and T. M. Atmono
Author(s)
Metallic implants are important components in biomedical treatment. However, post-surgery infection often occurs after installation of implant. The infections are usually treated by antibiotics, but it still causes several secondary problems. As a prevention treatment, the surgical instruments and implants must be in a sterile condition. This action is still not optimal too because the material still can attract the bacteria. From material science point of view, it can be anticipated by developing a type of material which has antibacterial properties or called antimicrobial material. Silver (Ag) and Copper (Cu) have antimicrobial properties to prevent the infection. In this research, the influence of deposition time of Ag-Cu thin film deposition process as antimicrobial material with Physical Vapor Deposition (PVD) RF Sputtering method was analyzed. Deposition time used were for 10, 15 and 20 minutes in Argon gas pressure around 3 x 10-2 mbar in during deposition process. The morphology and surface roughness of Ag-Cu thin film were characterized using SEM and AFM. Based on the results, the deposition time influences the quality morphology that the thin films have good homogeneity and complete structure for longer deposition time. In addition, from roughness measurement results show that increase deposition time decrease the roughness of thin film. Antimicrobial performance was analyzed using Kirby Bauer Test. The results show that all of sample have good antimicrobial inhibition. Adhesion quality was evaluated using Rockwell C Indentation Test. However, the results indicate that the Ag-Cu thin film has low adhesion strength.Metallic implants are important components in biomedical treatment. However, post-surgery infection often occurs after installation of implant. The infections are usually treated by antibiotics, but it still causes several secondary problems. As a prevention treatment, the surgical instruments and implants must be in a sterile condition. This action is still not optimal too because the material still can attract the bacteria. From material science point of view, it can be anticipated by developing a type of material which has antibacterial properties or called antimicrobial material. Silver (Ag) and Copper (Cu) have antimicrobial properties to prevent the infection. In this research, the influence of deposition time of Ag-Cu thin film deposition process as antimicrobial material with Physical Vapor Deposition (PVD) RF Sputtering method was analyzed. Deposition time used were for 10, 15 and 20 minutes in Argon gas pressure around 3 x 10-2 mbar in during deposition process. The morphology and surface roughn...