Claim Missing Document
Check
Articles

Found 16 Documents
Search

STUDI PREPARASI TIO2 NANOTUBE SERBUK DENGAN TEKNIK RAPID BREAKDOWN ANODIZATION Kusumawardanil, Linda J; Tribidasari, Ivandini; Gunlazuardi, Jarnuzi
-
Publisher : Fakultas Matematika dan ilmu pengetahuan Alam. Universitas Pakuan.

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.039 KB)

Abstract

Technique of Rapid Breakdown Anodization (RBA) is the new anodisasi technique introduced in 2009 as super fast synthesis methods for producing TiO2 powder. The development of this technique continues to be done in order to obtain the best quality of TiO2 powders according to the needs of the application. At this time the experiment reported the existence of the influence the granting of potential anodisasi currently underway against TiO2 powder produced good particle size, surface area and shape of the morfologinya. In addition, observations on the reaction time is also conducted to take into account the efficiency. From the results of the experiment, potential variations below 20 V, i.e., 10, 13, 14 and 15 V, it can be reported that the plate It can be transformed into the perfect TiO2 powder on electrochemical reaction of potential system 15 V for approximately 3 hours in perchloric acid media 0.15 M. Whereas the process of potential reactions on 10, 13 and 14 V does not produce TiO2 powder significantly in the time of observation for 7 hours. So further study focused on the synthesis of TiO2 powder results in a potential 15 V which will be compared with the potential 20 V, which is a potential that is used when this technique was first introduced. From the results of the experiment, reported on the potential RBA engineering 15 V produces TiO2 powder with a size outer diameter are smaller, i.e. an average of 84 nm with a more uniform particle size and surface area of the Crystal results kalsinasi at 500oC generated on 15 potential V is wider with a more uniform morphology, i.e. 69.723 g/m2 compared to 20 V , i.e. 63.824 g/m2. This will provide a significant influence in the activity of the fotokatalitik used for the fotodegradasi, as well as its application as DSSC (Dye Sensitized Solar Cells).  KeyWord  :Rapid Breakdown Anodization (RBA), Anodisasi, TiO2, TiO2 Nanotube-Serbuk
PREPARATION OF ELECTROCHEMICALLY IMMOBILIZED IRON ON THIN FILM FAUJASITE-NANOZEOLITE MODIFIED GLASSY CARBON Yuni K. Krisnandi; Ivandini T. Anggraningrum; Hanny Tovina; Aminah Aminah
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.774 KB) | DOI: 10.17146/jsmi.2011.12.2.4602

Abstract

PREPARATION OF ELECTROCHEMICALLY IMMOBILIZED IRON ON THIN FILM FAUJASITE-NANOZEOLITE MODIFIED GLASSY CARBON. Metal iron that electrochemically immobilized on thin film faujasite type of nanozeolite (FAU-nanozeolite) grown on polyelectrolyte (PDDA, PSS, PDDA layers) modified glassy carbon has been prepared. Thin film of FAU-type nanozeolite was synthesized using seeding method. The seeded modified-glassy carbon then was immersed in FAU colloidal suspension at 100 oC for certain period. XRD patterns of the seed and as-synthesized zeolite powder have similarity with the patterns from standard NaY zeolite. SEM images of thin film nanozeolite also show the appearance of crystals with homogeneous size of about < 1 μm. The best spread thin film was obtained when using 3 ml seed and immersion in colloidal FAU solution for 20 hours. The thin film then was utilized for metal iron synthesis, in which Fe(III) from FeNO3 solution containing Na-citrate of that adsorbed on the surface of thin film was electrochemically reduced to (Fe0). SEM image shows some aggregates (size > 100 nm) of the nanozeolite thin film. However, it can also be seen that the crystals actually consist of smaller particles with size < 100 nm. The EDS mapping of the surface indicates that after electrochemical treatment, the surface of thin film consists of about 0.30% (w/w) iron that spread evently both on the surface covered by nanozeolite thin film and that from modified glassy carbon.
Electrogenerated Chemiluminescence for Immunoassay Applications Isnaini Rahmawati; Irkham Irkham; Rahmat Wibowo; Jarnuzi Gunlazuardi; Yasuaki Einaga; Tribidasari Anggraningrum Ivandini
Indonesian Journal of Chemistry Vol 21, No 6 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.64596

Abstract

Electrogenerated chemiluminescence (ECL) has recently become one of the most prominent and well-established transducers for immunoassay techniques. ECL relates a luminophore concentration in solution with the emission of light triggered by an electrochemical stimulus. ECL immunoassay (ECLIA) performance depends on the parameters of its light generation, including the luminophore, the species that emit light called labels in ECLIA; co-reactants, which are added reagents that support the luminophore to undergo the excited state; electrodes, which are the place for the ECL reactions to take place; and the format of the immunoassay. This review discusses the behaviour of ECLIA parameters, the required instrumentations, and some important examples of detections based on ECLIA.
Copper-nickel-modified Boron-doped Diamond Electrode for CO2 Electrochemical Reduction Application: A Preliminary Study Jiwanti, Prastika Krisma; Aritonang, Rani Puspitasari; Abdullah, Imam; Einaga, Yasuaki; Ivandini, Tribidasari Anggraningrum
Makara Journal of Science Vol. 23, No. 4
Publisher : UI Scholars Hub

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

Abstract

CO2 electrochemical reduction (CO2ER) activity is known to be influenced by electrode materials. In this study, we report the fabrication of a copper-nickel-modified boron-doped diamond (CuNi-BDD) electrode using wet chemical seeding and electrodeposition. Annealing was performed to improve the stability of the modified electrode during elec-trolysis. Characterization of the modified BDD electrodes shows successful deposition without damage to the surface of the BDD support material. CO2ER was conducted with the CuNi-BDD electrode, which produces various important products including methanol, formic acid, CO, and CH4. Additionally, a different applied potential affected the product distribution. CO2ER was also conducted on the surfaces of Cu-BDD and Ni-BDD electrodes for comparison.
Hemoglobin-Modified Core–Shell Fe3O4@Au Nanostructures for the Electrochemical Detection of Acrylamide Saepudin, Endang; Yuliani, Tri; Nasution, Mochammad Arfin Fardiansyah; Khalil, Munawar; Hong, Jong Wook; Ivandini, Tribidasari Anggraningrum
Makara Journal of Science Vol. 25, No. 3
Publisher : UI Scholars Hub

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

Abstract

In this study, electrochemical detection of acrylamide using hemoglobin (Hb)-modified core–shell Fe3O4@Au nanostructures was conducted. Fe3O4 nanoparticles (~4.9 nm) and core–shell Fe3O4@Au (5.0–6.4 nm) nanostructures were successfully synthesized by the thermal decomposition method. Electrochemical investigation revealed that the optimum amount of Hb of 2 mg/mL could be immobilized in 0.1 M acetate buffer solution (pH = 6). Moreover, the detection of acrylamide using Fe3O4@Au/Hb was evaluated by the cyclic voltammetry technique. A linear calibration curve (R2 = 0.98) in the concentration range of 0.1 to 1.0 µM could be achieved with an estimated limit of detection, limit of quantification, and sensitivity of 0.136 µM, 0.453 µM, and 0.4411 µA/µM, respectively. Furthermore, the developed biosensor exhibited high selectivity in the presence of ascorbic acid, melamine, and caffeine. The developed biosensor was applied to the detection of acrylamide in coffee samples and validated using the standard high-performance liquid chromatography (HPLC) method. The concentration of acrylamide in coffee samples was determined to be 37.450 and 35.377 ppm using electrochemical measurement and HPLC, respectively.
Thermo- and pH-Responsive Behavior of Poly(N-isopropylacrylamide)-Block-Poly[(2-dimethylamino)ethyl Methacrylate] Noverra Mardhatillah Nizardo; Rida Hasna Fadhilah; Ivandini Tribidasari Anggraningrum
Indonesian Journal of Chemistry Vol 23, No 2 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79264

Abstract

The influence of poly(2-dimethylamino)ethyl methacrylate (PDMAEMA) block on the thermo- and pH-responsive behavior of poly(N-isopropyl acrylamide)-block-poly[(2-dimethylamino)ethyl methacrylate)] (PNIPAM-b-PDMAEMA) was studied. The block copolymers were synthesized using reversible addition-fragmentation chain transfer (RAFT) polymerization by varying the chain length of the second block (PDMAEMA). 1H-NMR and FTIR spectra confirmed the formation of block copolymers PNIPAM21-b-PDMAEMA2 and PNIPAM21-b-PDMAEMA7 with the corresponding molar masses from the GPC data. Thermo- and pH-responsive behavior of block copolymers was investigated in phosphate buffer with various pHs. Interesting results showed that the hydrophilic carboxyl end group and the hydrophobic dodecyl end group of the RAFT agent affected the resulting phase transition temperature (Tc), while the Tc was found to be low in the acidic environment. Moreover, larger particle sizes of PNIPAM21‑b‑PDMAEMA2 were found with a pH of 9. It is noteworthy, that the resulted block copolymers might have the potential use in a drug delivery system.
STUDI PREPARASI TIO2 NANOTUBE SERBUK DENGAN TEKNIK RAPID BREAKDOWN ANODIZATION Linda J Kusumawardanil; Ivandini Tribidasari; Jarnuzi Gunlazuardi
Ekologia: Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup Vol 16, No 1 (2016): Ekologia : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/ekol.v16i1.56

Abstract

Technique of Rapid Breakdown Anodization (RBA) is the new anodisasi technique introduced in 2009 as super fast synthesis methods for producing TiO2 powder. The development of this technique continues to be done in order to obtain the best quality of TiO2 powders according to the needs of the application. At this time the experiment reported the existence of the influence the granting of potential anodisasi currently underway against TiO2 powder produced good particle size, surface area and shape of the morfologinya. In addition, observations on the reaction time is also conducted to take into account the efficiency. From the results of the experiment, potential variations below 20 V, i.e., 10, 13, 14 and 15 V, it can be reported that the plate It can be transformed into the perfect TiO2 powder on electrochemical reaction of potential system 15 V for approximately 3 hours in perchloric acid media 0.15 M. Whereas the process of potential reactions on 10, 13 and 14 V does not produce TiO2 powder significantly in the time of observation for 7 hours. So further study focused on the synthesis of TiO2 powder results in a potential 15 V which will be compared with the potential 20 V, which is a potential that is used when this technique was first introduced. From the results of the experiment, reported on the potential RBA engineering 15 V produces TiO2 powder with a size outer diameter are smaller, i.e. an average of 84 nm with a more uniform particle size and surface area of the Crystal results kalsinasi at 500oC generated on 15 potential V is wider with a more uniform morphology, i.e. 69.723 g/m2 compared to 20 V , i.e. 63.824 g/m2. This will provide a significant influence in the activity of the fotokatalitik used for the fotodegradasi, as well as its application as DSSC (Dye Sensitized Solar Cells).  KeyWord  :Rapid Breakdown Anodization (RBA), Anodisasi, TiO2, TiO2 Nanotube-Serbuk
Preparation of boron-doped diamond microelectrodes to determine the distribution size of platinum nanoparticles using current transient method Aliyah; Reza Rizqi Nurhidayat; Afiten Rahmin Sanjaya; Rahmat Wibowo; Yasuaki Einaga; Endang Saepudin; Tribidasari Anggraningrum Ivandini
Environmental and Materials Vol. 1 No. 1: Juni (2023)
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v1i1.2023.117

Abstract

Boron-doped diamond (BDD) microelectrodes were prepared to investigate the correlation of hydrazine oxidation current responses with Pt nanoparticle (Pt NP) size distribution. The BDD film was grown on the surface of a tungsten needle with a diameter of 25 µm. An average particle size of around 5 µm BDD crystalline was successfully synthesized using a microwave plasma-assisted chemical vapor deposition technique. The Raman spectrum confirmed the presence of diamond formation as indicated by peaks corresponding to C-C sp3 bonds, while X-ray photoelectron spectroscopy spectrum showed the presence of C-H and C-OH bonds on the surface of the BDD microelectrode. Meanwhile the Pt nanoparticles was synthesized through reduction reaction of  PtCl62- solution using NaBH4 with citric acid as the capping agent. Particles size between 4.46 to 4.78 nm were observed by using TEM measurements. The BDD microelectrodes were utilized to investigate the relationship between Pt nanoparticle size distribution and the current generated from the oxidation reaction of 15 mM hydrazine in a 50 mM phosphate buffer solution pH 7.4 in the presence of 1.0 mL nanoparticle solutions. A current range of 5 and 6 nA with a noise level of 0.15 nA was observed showing a good correlation with the particle sizes of Pt NPs. Comparison was also performed with the measurements using Au microelectrodes, indicated that the prepared BDD microelectrodes is promising for the measurements of nanoparticle sizes distribution, especially Pt NPs.
Modification of Gold Nanoparticles at Carbon Electrodes and the Applications for Arsenic (III) Detections Ivandini, Tribidasari Anggraningrum; Wijaya, Lany; Gunlazuardi, Jarnuzi
Makara Journal of Science Vol. 16, No. 1
Publisher : UI Scholars Hub

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

Abstract

THE DEVELOPMENT OF BIOCHEMICAL OXYGEN DEMAND SENSOR USING LOCAL YEAST: Candida fukuyamaensis, UICC Y-247 Anggraningrum, Ivandini Tribidasari; Zulfia, Fenny Triana; Saepudin, Endang
Makara Journal of Science Vol. 15, No. 1
Publisher : UI Scholars Hub

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

Abstract

In order to shorten the measurement time of biochemical oxygen demand (BOD), a BOD sensor based on yeast metabolism was developed. Local yeast, Indonesian Origin, Candida fukuyamaensis UICC Y-247, was used as a transducer. The yeast was immobilized as a thin film in agarose matrix with the auxiliary of Nafion® acting as the membrane for ion exchange process. The film was then attached to gold-modified glassy carbons and used as transducer on the working electrodes. The measurements were conducted by observing the depletion of glucose concentration using multipulse amperometric method and then converted to BOD values. Optimum condition was observed in a waiting measurement time of 30 min at an applied potential of 450 mV (vs. Ag/AgCl). Linearity was shown in glucose concentration range of 0.1–0.5 mM, which was equivalent to BOD concentration range of 10–50 mg/L. A detection limit of 1.13 mg/L BOD could be achieved. Good repeatability was shown by a relative standard deviation (RSD) of 2.7% (n = 15). However, decreasing current response of ~50% was found after 3 days. Comparing to the conventional BOD measurement, this BOD sensor can be used as an alternative method for BOD measurements.