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Busa Super Kuat Namun Ringan

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  • nano_indonesia
    Membuat busa untuk kasur selalu harus memperhatikan keseimbangan antara kekuatan dan kelenturan. Namun, busa jenis baru yang terbuat dari karbon nano berbentuk
    Message 1 of 4 , Nov 29, 2005
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      Membuat busa untuk kasur selalu harus memperhatikan keseimbangan
      antara kekuatan dan kelenturan. Namun, busa jenis baru yang terbuat
      dari karbon nano berbentuk tabung tidak perlu mempermasalahkan hal
      itu lagi.
      Penelitian terbaru menunjukkan bahwa tabung-tabung karbon nano
      memperlihatkan sifat seperti pegas yang sangat kenyal. Tabung karbon
      nano pertama kali dibuat pada 1991. Bahan tersebut adalah struktur
      berbentuk karbon berukuran mikroskopis yang dibuat oleh para ilmuwan
      dengan cara memanipulasi susunan atom karbon.
      Lapisan-lapisan tabung karbon nano dibuat menyerupai kasur busa,
      lentur dan memantul jika ditekan. Tapi, tidak seperti kasur busa yang
      lambat laun renggang dan kehilangan kelenturannya, busa tabung karbon
      nano dapat mempertahankan gaya pegasnya meskipun ditekan hingga
      ribuan kali.
      Material ini dapat digunakan untuk membuat cangkir kopi yang dapat
      didaur ulang atau lapisan luar pesawat luar angkasa, kata penemunya
      sebagaimana dimuat dalam jurnal Science edisi 25 November.
      "Tabung karbon nano memiliki kombinasi kekuatan, kelenturan, dan
      kepadatan yang unik sehingga sangat berpotensi untuk membuat struktur
      mirip busa yang kuat namun ringan," kata Pulickel Ajayan, seorang
      insinyur dan ilmuwan material di Ranseller Polytechnic Institute.
      Tabung karbon nano dibuat dari karbon dalam bentuk mirip grafit.
      Material tersebut sudah digunakan sebagai campuran untuk memperkuat
      beton selain penggunaan dalam bidang lainnya. Atom-atomnya disusun
      membentuk sisi tabung seperti bentuk usus ayam.
      "Tabung karbon nano ini dapat diringkas hingga 15 persen panjang
      normalnya dengan menekuk dan melipatnya seperti busa," kata peneliti
      pendamping Anyuan Cao yang merupakan peneliti postdoktoral di
      University of Hawaii, Manoa. "Setelah beberapa kali ditekan (kemudian
      dilepas), tabung karbon nano akan membentang dan kembali ke bentuk
      asalnya dengan menghasilkan efek pegas yang sangat kuat," lanjutnya.
      Ketebalannya sedikit berkurang setelah ratusan kali ditekan namun
      akan kembali normal dan tetap bertahan hingga 10 ribu tekanan tanpa
      rusak. Tabung karbon nano juga sangat stabil pada suhu dan
      kelembaban tinggi termasuk menghadapi zat kimia yang sangat keras.

      Sumber: Kompas, 30 November 2005
    • agus haryono
      Dear bapak & ibu penggiat nanoteknologi Indonesia, Saya baru saja ikut masuk ke milis ini. Begitu saya masuk ke arsip milis ini, saya kaget betul....Baru kali
      Message 2 of 4 , Dec 5, 2005
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        Dear bapak & ibu penggiat nanoteknologi Indonesia,

        Saya baru saja ikut masuk ke milis ini. Begitu saya masuk ke arsip milis ini, saya kaget betul....Baru kali ini saya ikut milis yg begitu sedikit posting yang masuk!!! Atau memang ini sama dengan realitas penelitian nanoteknologi di Indonesia, yg memang masih sangat sedikit sekali.

        salam perkenalan dari saya:
        1. Nama: Dr.Eng. Agus Haryono
        2. Institusi: Polymer Chemistry Group, Pusat Penelitian Kimia, LIPI
        Puspiptek Serpong
        3. Pendidikan: S1-S3 di Waseda Univ. Tokyo-Japan (Polymer Chemistry)
        4. Research saat ini yg berkenaan dengan nanoteknologi: Stabilization of nanoemulsion with polymer surfactant, Control location of nanoparticle on the block-copolymer matrix.
        5. Research sebelumnya: Polymeric Self-Assembeld Monolayer, Polymer Additive, Oxidative Polymerization, Polymer Recycling etc


        Beritaduka untuk dunia nanoteknologi, peraih hadiah Nobel Kimia tahun 1996, Richard Smalley telah meninggal dunia di usia 62 tahun, karena penyakit leukimia yg dideritanya.
        Silakan disimak,

        Regards,
        agusharyono

        Nobel Laureate Richard Smalley Dead At 62

        Codiscoverer of C60, a new form of carbon, did much to advance nanotechnology

        Ron Dagani

        RICE UNIVERSITY PHOTO
        Richard E. Smalley
        1943–2005
        Richard E. Smalley, a giant in the field of nanotechnology who shared in the 1996 Nobel Prize in Chemistry for the discovery of fullerenes, died on Oct. 28 after a seven-year battle with leukemia. He was 62.
        Smalley spent most of his career at Rice University, where he was a professor of chemistry and of physics and founding director of the Center for Nanoscale Science & Technology.
        He shared the Nobel Prize with fellow Rice chemist Robert F. Curl Jr. and British chemist Sir Harold W. Kroto for their 1985 discovery of buckminsterfullerene (“buckyball”), a new form of carbon. The finding of this 60-carbon cage molecule opened a new field of research that led to the discovery, elsewhere, of carbon nanotubes-tubular fullerenes that soon became the focus of Smalley's research. Over the years, he and his coworkers developed improved methods for making high-quality single-walled nanotubes, which are highly desired for many applications.
        Smalley considered nanotubes to be a wondrous material that could help humanity achieve some of its most challenging goals, such as the quest for clean, inexpensive energy. In 2000, he helped found Carbon Nanotechnologies Inc. to produce “buckytubes” for the benefit of society.
        Smalley also became a peripatetic spokesman for nanotechnology, crisscrossing the country to give speeches, testify before Congress, and meet with government, academic, and industrial leaders. In 1999, he supported the National Nanotechnology Initiative and is credited with playing a crucial role in getting it approved by Congress. Federal spending for this sweeping R&D program is topping $1 billion this year.
        Even before his work with fullerenes, Smalley had made important contributions. He pioneered the use of supersonic jet cooling in conjunction with laser spectroscopy to simplify complex spectra and observe van der Waals molecules and free radicals. He also combined laser vaporization, jet cooling, and laser spectroscopy to study metal clusters and their chemistry. This work led to his study of carbon clusters and the discovery of fullerenes.
        Any one of these accomplishments would make for “a rather good career for most scientists,” Curl tells C&EN. “Taken together, they are simply breathtaking.”
        Smalley's scientific colleagues remember him for his intensity, focus, and passion for science. “His mind was like a searchlight bringing whatever it looked at into clarity,” Curl says. “He was such a fighter that, until the last few days, I believed he would beat the cancer, just as he succeeded in beating all technical problems.”
        “He was always an iconoclast, always looking for the unexpected, the signal he didn't understand,” remembers Naomi J. Halas, another Rice colleague. Projects that went as expected tended to bore him, she says.
        One of Smalley's most ambitious programs was launched in April with $11 million in funding from NASA. The program is aimed at the construction of a “quantum wire”-a continuous cable of carbon nanotubes that, Smalley said, “will conduct electricity 10 times better than copper yet have only one-sixth the weight … and a tensile strength greater than steel. If we succeed, we'll be able to rewire the world, replacing aluminum and copper in virtually every application and permitting a vast increase in the capacity of the nation's electrical grid.”
        Rice chemistry professor James M. Tour, a close friend and collaborator, marvels at the intricately detailed drawings of equipment that Smalley included in his research notebook. “It reminded me of the notebooks of Leonardo da Vinci-the musings of a genius,” Tour says. “Indeed, a Leonardo da Vinci has passed.”
        Chemical & Engineering News
        ISSN 0009-2347
        Copyright © 2005 American Chemical Society


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      • amini@ristek.go.id
        Yth Masyarakat Nano Indonesia, Berikut ini kami lampirkan undangan workshop hasil kajian/studi, khususnya bidang Teknologi Nano di KNRT (tanggal 23 Des 2005).
        Message 3 of 4 , Dec 15, 2005
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          Yth Masyarakat Nano Indonesia,

          Berikut ini kami lampirkan undangan workshop hasil kajian/studi, khususnya bidang
          Teknologi Nano di KNRT (tanggal 23 Des 2005). Bagi yang berminat berpartisipasi dalam
          acara tersebut, dimohon konfirmasinya.

          Bagi yang tertarik pada kajian lainnya (Pada jadwal hari selasa 22 Des 2005) juga
          dimohon konfirmasinya.

          Terimakasih

          Ms. Siti Amini
          Head of Chemistry and Material Science Division
          Ass.Dep.Min. for Natural Sciences of the Research Sciences and Technology Development -
          State Ministry for Research and Technology-Indonesia
          Tel. +62 21 3169288
          Fax: +62 21 3102014
          hp. 08161930531
        • amini@ristek.go.id
          Yth Masyarakat Nano Indonesia, Berikut ini kami lampirkan undangan workshop hasil kajian/studi, khususnya bidang Teknologi Nano di KNRT (tanggal 23 Des 2005).
          Message 4 of 4 , Dec 15, 2005
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            Yth Masyarakat Nano Indonesia,

            Berikut ini kami lampirkan undangan workshop hasil kajian/studi, khususnya bidang
            Teknologi Nano di KNRT (tanggal 23 Des 2005). Bagi yang berminat berpartisipasi dalam
            acara tersebut, dimohon konfirmasinya.

            Bagi yang tertarik pada kajian lainnya (Pada jadwal hari selasa 22 Des 2005) juga
            dimohon konfirmasinya.

            Terimakasih

            Ms. Siti Amini
            Head of Chemistry and Material Science Division
            Ass.Dep.Min. for Natural Sciences of the Research Sciences and Technology Development -
            State Ministry for Research and Technology-Indonesia
            Tel. +62 21 3169288
            Fax: +62 21 3102014
            hp. 08161930531
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