Last thesis defense

Today, the last students of our lab have successfully defended their master thesis. They were Ika Widiana and Rizka Zulhijah. Ika defended her work about grafting of silica gel prepared from bagasse ash. Her examiners were Dr. Sri Rachmania juliastuti, Dr. Widiastuti and Dr. Samsudin Affandi. Rizka defended her thesis about anodizing of steel for corrosion protection by electorlysis, hydrothermal and electrolysis-hydrothermal methods. The examiners were Prof. Ali Altway, Dr. Samsudin Affandi and Dr. Susianto.

In this period of graduation (the ceremony will be held on September), there are 20 bachelor students and 2 master students who will complete their study. They have worked hard during their stay in laboratory and became a good team. Now we are glad and proud to let them go to pursue their career. May Allah bless you all. Congratulations.

This is our great team.

Top (L-R): Irul, Yayan, Dani, Yeye, Adrian, Rizki, Rian, Febryan
Upper (L-R): Yetty, Mida, Yulia, Mitha, Ika, Meta, Nanik, Dewi, Rizka
Lower (L-R): Desi, Desy, Zarra, Ir. Minta, Prof. Heru, Ifah, Ilmi, Ririn
Bottom (L-R): Yudis, Ardya, Junita, Intan, Reyhan

 

 

 

Qualification exam

Nanik Astuti Rachman (doctoral student) successfully passed the qualification exam to be a doctoral candidate. The exam was held this morning (Monday, 16 July 2012) started from 10 a.m. to 11.30 a.m. The examiners were Prof. Ali Altway (ITS), Dr. Samsudin Affandi (ITS) and Dr. Agus Purwanto (UNS).

Today, Yudhistira and Yehuda (undergraduate students) also successfully passed the examination for their preliminary plant design of precipitated calcium carbonate. They presented and defended their plant design in front of three examiners: Prof. Arief Widjaja, Dr. Samsudin Affandi and Ir. Minta Yuwana, M.S. for about two and half hours started from 13.30 p.m. to 16.00 p.m.

Lab Seminar 9 June 2012

Students presented their progress this time were

  1. Nanik Astuti Rachman (D2): Amine grafting on silica from bagasse ash
  2. Sri Muljanie (D3): Effect of aging and pH on the properties of silica gel from geothermal sludge
  3. Adrian Nur (D2): Electrochemical synthesis of nano-sized particles of hidroxyapatite
  4. Vania Mitha (M1): Review a paper on characterization of proton exchange membrane (PEM), with the focus on the characterization using electrochemical impedance spectroscopy (EIS) method

Electrosynthesis of magnetite nanoparticles

We have successfully synthesized magnetite (Fe3O4) nanoparticles and SiO2-coated magnetite nanoparticles by an enviromentally friendly electrochemical method. The results have been published in: (i) Advanced Powder Technology and (ii) Journal of Nanoparticle Research. Below is summary of the articles

Advanced Powder Technology (2011), in press
Synthesis of magnetite nanoparticles by surfactant-free electrochemical method in an aqueous system
Method: electro-oxidation of iron in water
Material: magnetite (Fe3O4)
Particle size: 10-30 nm
Properties: ferromagnetic
Impurities: FeOOH

SEM image and particle size distribution

Journal of Nanoparticle Research (2012) 14:807
One-step synthesis of silica-coated magnetite nanoparticles by electrooxidation of iron in sodium silicate solution
Method: electro-oxidation of iron in sodium silicate solution
Material: SiO2-coated magnetite
Size: 6-10 nm
Properties: superparamagnetic
Impurities: none

SEM image and particle size distribution

Workshop on EIS


Picture with Mr. Luca Pini from Metrohm after workshop

11-12 April 2012. We held a workshop on the theory and practice of electrochemical impedance spectroscopy (EIS) on 11-12 April 2012. The participants were all members of our lab. The trainer was Mr. Luca Pini from Metrohm, Netherland, that has expertise in the field.

In the first day, the workshop was held in the new Research Center building. Luca talked about types of corrosion, how to monitor them and corrosion analysis using EIS. He also talked about the usefulness of using EIS method compared to other electrochemical techniques such as linear polarization and cyclic voltametry. Different from linear polarization that only provide information on the material properties, EIS provides us useful information not only related to material being tested, but also to the properties of solution and interface (double layer).

After he explained for about 2 hours, the class was continued by discussion. There were many interesting questions concerning with analysis using EIS, mostly concerning with how to interpret EIS data in the form of Bode plot and Nyquist plot. Something that very important for analysis using EIS was about choosing the range of frequency applied on the measurement to get good data. The discussion went on for about 1 h.

In the second day, we moved to laboratory to practice EIS analysis on a magnetite-coated steel using potensiostat/galvanostat instrument Autolab PGSTAT 302, Metrohm. For about 3 h, some students practiced to use the instrument to get a good results. They were also tried to model the EIS data using equivalent electrical circuit and to interpret the Bode and Nyquist plots.

The workshop is really fruitful for our students. Thanks Luca.

Welcome… Selamat Datang…

Welcome to Lab. Electrochemical engineering, Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember (ITS). We aim to advance chemical engineering education through advanced research in electrochemical engineering and particle technology by addressing issues on material processing for energy, biomedical, environmental and agriculture.