(Berita Baik) Prestasi Internasional Mahasiswa Indonesia
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(Berita Baik) Prestasi Internasional Mahasiswa Indonesia
Curiosity yang sedang menjalankan misi di Mars menggunakan laser plasma spektroskopi
Spoiler for "Foto":
Ali Khumaeni, seorang mahasiswa Indonesia yang sedang menempuh pendidikan doktor di Universitas Fukui Jepang, mendapat penghargaan ilmiah Great Scientific Exchange 2012 (SCIX 2012), di Kansas City, Missouri, Amerika Serikat akhir pekan lalu berkat terobosan dalam bidang teknik analisis atom.
SCIX 2012 adalah pertemuan ilmiah internasional terbesar untuk bidang sains analitik dan spektroskopi yang diselenggarakan oleh Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) sejak 1973.
Setiap tahun, FACSS memilih paper ilmiah terbaik oleh mahasiswa pasca sarjana. Tahun ini terpilih 1 mahasiswa penerima penghargaan FACSS dan 2 mahasiswa penerima beasiswa The Tomas Hirschfeld Scholar melalui proses seleksi yang sangat ketat.
"Tercatat sejak 2006, penghargaan FACSS selalu diraih oleh mahasiswa dari Universitas di Amerika Serikat dan alhamdulillah tahun ini kita bisa meraihnya" kata Khumaeni dalam email pada BBC Indonesia.
Terobosan penting
Khumaeni membuat terobosan baru dalam bidang laser plasma spektrokopi, yaitu teknik analisis atom dalam material dengan memanfaatkan laser pulsa berdaya tinggi. Di dalam bidang ini, mayoritas peneliti memanfaatkan laser pulsa Nd:YAG untuk analisis material. Kelemahan dari metode ini adalah tidak bisa digunakan untuk analisis atom dengan sensitivitas tinggi pada material yang bersifat non-padat. Selain itu, metode ini juga tidak bisa digunakan untuk analisis atom metal berbahaya karena material akan rusak disebabkan ablasi material oleh laser.
Analisis permukaan material sangat penting dalam industri termasuk industri nuklir. Untuk memecahkan persoalan ini, Khumaeni dan timnya membuat terobosan metode baru yang dinamakan laser gas plasma spektroskopi. Di dalam teknik ini, sebuah gas plasma dihasilkan dalam permukaan metal dengan memanfaatkan laser pulsa TEA CO2.
Dengan berbagai teknik sampling yang sederhana, gas plasma tersebut berinteraksi dengan berbagai material non-padat yang akan dianalisis. Hasilnya menunjukkan bahwa metode baru ini bisa digunakan untuk analisis material non-padat dengan cepat dan menghasilkan sensitivitas yang tinggi dibandingkan dengan metode laser plasma spektroskopi pada umumnya.
Selain itu, metode baru ini juga bisa digunakan untuk analisis permukaan material tanpa membuat kerusakan material sehingga bisa diaplikasikan industri-industri yang membutuhkan analisis permukaan seperti semikonduktor dan nuklir.
Semoga metode baru ini bisa memberikan kontribusi penting dalam bidang spektroskopi, khususnya spektroskopi atom dengan memanfaatkan laser," kata Khumaeni.
Salah satu aplikasi penting metode laser plasma spektroskopi saat ini adalah untuk misi planet Mars. Metode ini digunakan robot Curiosity yang akan digunakan untuk mendeteksi atom-atom yang sangat penting untuk mengetahui tanda-tanda kehidupan di planet.
He is Ali Khumaeni, an Indonesian student at Department of Nuclear Power and Energy Safety Engineering, University of Fukui, Japan. He was born in Kendal on August 7, 1983. His recent address is Fukui Bunkyo 5-32-11 Yanagihara Kopo B2, Fukui, Japan. In Indonesia, he lives at Jl Utama Bantaran Tanjunganom Rowosari Kendal Jawa Tengah. For correspondence, he usually uses this following email address, khumaeni83@yahoo.com, and Hp (+81) 90 9442 2109. In November 2010, he got married to Khusnul Aini in Batang Jawa Tengah.
He completed his education from elementary school to senior high school in Kendal. After graduating from SMA N I Weleri Kendal Jawa Tengah in 2001, he studied english and basic physics. In 2002, he entered the Department of Physics, Diponegoro University. He earned his BSc (S.Si) degree in 2006 with a specialized majoring in laser plasma spectroscopy with a judicium of cum-laude.
During his study at the Department of Physics Diponegoro University, Khumaeni conducted a research on laser-induced plasma spectroscopy (LIPS) and its applications at the Maju Makmur Mandiri Research Center (M3RC) under Professor Wahyu Setiabudi and Dr. Hendrik Kurniawan�s supervision. Besides, he has also been involved in a collaboration with Prof. Kiichiro Kagawa of University of Fukui from Japan. During the long collaboration, he always shows an excellent performance proven by some published works he was involved. In 2007, he entered the Department of Physics University of Fukui as a research student. Under the direction of Prof. Kiichiro Kagawa, he directs his research into laser-induced plasma spectroscopy by utilizing the specific characteristics of a TEA CO2 laser.
Khumaeni earned some awards for his works in the field of laser-induced plasma spectroscopy utilizing TEA CO2 laser. In 2008, he was awarded as the young scientist award for his outstanding research on herb medicine and food powder analysis using TEA CO2 laser from the 4th International Conference on Laser Probing LAP 2008 held in Nagoya, Japan. Khumaeni was further awarded as the 2nd best paper from the 6th International Conference on Laser-Induced Breakdown Spectroscopy held in Memphis Tennessee USA on September 13-17, 2010. In this conference, he presented his paper entitled �Direct analysis of powder sample using TEA CO2 laser-induced metal-assisted gas plasma at 1 atm by introducing the powder particles into the plasma�.
In December 2010, he again got award as the best poster presentation with a category of security analysis from the International Chemical Congress of Pacific Basin Societies held in Hawaii USA. He presented his remarkable work on application of laser-induced breakdown spectroscopy for security analysis especially the material in the form of powder present in a minute amount.
Laser-induced breakdown spectroscopy (LIBS) has recently become an increasingly popular technique for rapid and in-situ qualitative and quantitative elemental analysis of various samples in different forms such as solids, liquids, and gases. LIBS is much easier to widely spread and significantly develop due to the fact that the vaporization, atomization, and excitation processes take place at the same time by a single treatment of laser irradiation. In standard LIBS technique, a Nd:YAG laser is directly focused onto a sample surface to induce a strong breakdown plasma, which contains neutral atoms, ions, electrons and molecules ablated from the sample. However, relatively few results have been reported on its applications to the direct analysis of powder samples.
On contrary to the standard LIBS technique above, we found that a transversely excited atmospheric (TEA) CO2 laser is suitable to the analysis of powder sample. Due to the high absorbance of the powder at the long wavelength of the TEA CO2 laser (10.64 �m in wavelength), the plasma can be initiated more easily and the serious blow-off of the powder can effectively be suppressed.� It should be known that in case of LIBS using a TEA CO2 laser, a large gas breakdown plasma was produced when the laser was focused on a metal surface, while the metal itself was never ablated. This phenomenon never occurs for the case of standard LIBS technique, in which a Nd:YAG laser is most often employed to induce a laser plasma. By utilizing this phenomenon, several unique techniques for powder analyses have successfully been governed. Based on these special characteristics of the TEA CO2 laser, we have developed novel analytical techniques of TEA CO2 laser-induced plasma for atomic emission spectroscopy on powder material. Since 2007, we have published several papers in International Journals including applied spectroscopy, journal of Korean physical societies, American Institute of Physics, Journal of the spectroscopical society of japan, and Current applied physics.
Alamat Blognya: http://khumaeni.wordpress.com/
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