Tag Archives: aerogel

Fabricating aerogel from coir fiber

We have devised a cheap and green method to convert coir fiber into compressible and ultralight cellulose aerogel. We published our findings in Cellulose (read and share here). Aerogels are highly porous materials with very low thermal conductivity and very high absorption capacity, and among one of the lightest materials known.

In the present study, we developed cellulose aerogel from coir fiber, an abundantly available agricultural waste materials, that has high absorption capacity towards water, oil and dyestuffs. The aerogel has a macroporous structure, ultralight density, high porosity, good durability, and thermal stability. The aerogel was capable of absorbing 22 and 18 times its dry weight in water and oil, respectively. The material also had a high capacity for methylene blue dye adsorption of up to 62 g/g, which was one hundred times higher than that of adsorbents synthesized from the other natural matters. Therefore, the prepared aerogels have potential for various sorption applications.Therefore, this material has potential application for diapers, cleaning of oil spills, and adsorbent for dyes.

Kami telah menemukan metoda yang murah dan ramah lingkungan untuk mengubah sabut kelapa menjadi aerogel selulosa yang dapat ditekan dan sangat ringan. Kami menerbitkan temuan kami di Cellulose (baca dan bagi disini). Aerogel adalah bahan yang sangat berpori dengan konduktivitas panas yang sangat rendah dan kapasitas absorpsi yang sangat tinggi, dan salah diantara bahan paling ringan yang dikenal.

Dalam penelitian sekarang, kami mengembangkan aerogel selulosa dari sabut kelapa, bahan limbah perkebunan yang tersedian melimpah, yang mempunyai kapasitas absorpsi sangat tinggi terhadap air, minyak dan zat warna. Aerogel ini mempunyai struktur makropori, densitas sangat ringan, porositas tinggi, ketahanan dan stabilitas panas bagus. Aerogel tersebut mampu menyerap 22 dan 18 kali berat keringnya, berturut-turut, dalam air dan minyak. Bahan ini juga mempunyai kapasitas tinggi untuk adsorpsi zat warna metilena biru sampai 62 g/g, yang mana seratus kali lebih tinggi daripada adsorben yang dibuat dari bahan alam lain. Dengan demikian, bahan ini mempunyai aplikasi potensial untuk popok, pembersih tumpahan minyak, dan adsorben untuk zat warna.

(hs)

Tiga proposal PKMPE lolos untuk didanai

Cell Aerogel

Hasil evaluasi Program Kreativitas Mahasiswa (PKM) 5 bidang perguruan tinggi negeri tahun 2016 secara resmi telah diumumkan (disini). Lab. Elektrokimia dan Korosi, Jurusan Teknik Kimia ITS kembali menorehkan prestasinya dengan meloloskan >75% proposal berhasil untuk didanai. Mahasiswa Lab. Elektrokimia dan Korosi untuk pendanaan 2016 telah mengirimkan 4 proposal PKMPE. Dari 4 proposal yang dikirim tersebut, 3 diantaranya berhasil lolos untuk didanai, yaitu:

  1. Sintesis Komposit Silika-Karbon dari Waterglass dan Gula dengan Metoda Sol-Gel sebagai Adsorbent Umum yang Unggul (Tsalatsa Salsabila dkk.).
  2. Ekstraksi Anthocyanine dari Kulit Terong Ungu Untuk Bahan Pewarnaan Untuk Dye-Sensitized Solar Cell (DSCC) Berbasis Lapisan Tipis ZnO (Muhammad Iqbal dkk.).
  3. Superabsorben Aerogel Selulosa dari Kertas Bekas sebagai Penyerap Tumpahan Minyak di Laut (Nur Anggita Ayu dkk.).

Topik-topik tersebut merupakan topik unggulan yang secara kontinyu diteliti di Lab. Elektrokimia dan Korosi, Jurusan Teknik Kimia ITS.

A paper is accepted in J. Non-Cryst. Solid

Our manuscript has been accepted for publication in the Journal of Non-Crystalline Solids published by Elsevier (Impact factor: 1.597); a journal on the chemical electronic, optical and mechanical properties of glasses, amorphous semiconductors and metals, sol-gel materials, the liquid state of these solids and the process by which they are formed.

Using bagasse ash as a silica source when preparing silica aerogels via ambient pressure drying

N. Nazriati, Heru Setyawan, Samsudin Affandi, Minta Yuwana, Sugeng Winardi

HIGHLIGHTS

  1. A novel and cheap approach for producing silica aerogels is proposed.
  2. The silica aerogels have very high surface area which can reach > 1000 m2/g.
  3. The silica aerogels exhibit strong hydrophobicity.
  4. Bagasse ash, a solid waste of sugar mills, is a viable material to produce silica aerogels.

ABSTRACT

Silica aerogels were prepared using bagasse ash as a silica source through a route involving the surface modification of wet gels and ambient pressure drying (APD). The silica in the bagasse ash was extracted using a NaOH solution to form the sodium silicate precursor for the silica aerogels. Trimethylchlorosilane (TMCS) and hexamethyldisalazane (HMDS) were used to replace the surface silanol groups with alkyl groups to prevent the condensation and shrinkage of the gel structure during APD. The prepared silica aerogels exhibited strong hydrophobicity. The silica aerogels aged in water possess a higher surface area than those aged in hexane. The mixing time for the silylating agents with the silica precursor influences the surface area of the silica aerogels. The highest surface area and pore volume of the silica aerogels were 1114 m2/g and 2.16 cm3/g, respectively.

Keywords: bagasse ash; silica aerogel; ambient pressure drying; surface modification; silylation.

GRAPHICAL ABSTRACT

Graphical Abstract