DİSPERSİYON HAZIRLAMA TİPİ VE SON KOAGÜLASYON BANYOSUNUN YAŞ ÇEKİM METODU İLE ÜRETİLEN GRAFEN OKSİT LİFLERE ETKİSİ

Year 2015, Volume: 25 Issue: 3, 215 - 219, 01.12.2015

Nuray Uçar Gökçen Gökçeli Nilgün Karatepe Ayşen Önen

Abstract

Grafen oksit (GO) lifi, yüksek elektrik iletkenliği, uygun termal ve mekanik özellikleri ve üretim kolaylıkları sebepleri ile oldukça ilgi çekici bir konumdadır. Enerji, sensor, katalist vb. pek çok alanda kullanım potansiyeline sahiptir. Çok yakın bir zamanda, yaş çekim metodu ile üretilen GO lifleri üzerine çalışmalar başlandığından, oldukça kısıtlı sayıda çalışma literatürde mevcuttur. Bu çalışmada ise, farklı süre ve farklı devir/dakika ’da GO dispersiyonu hazırlanmış, son koagülasyon banyosunda ise farklı oranda aseton kullanılmıştır. Böylece, ilk defa, GO dispersiyonu hazırlama metodunun ve son koagülasyon banyosundaki aseton oranının, GO lifinin mekanik ve elektrik iletkenliği üzerine olan etkisi incelenmiştir. GO dispersiyonunun hazırlanmasında uygulanan devir/dakikanın, dispersiyon süresine kıyasla mekanik özellikler üzerine etkisinin çok daha fazla olduğu görülmüştür. Son koagülasyon banyosu %100 aseton olan numunelerin mekanik özellikleri, %80 aseton-%20 su içeren numunelere göre daha düşüktür. Numuneler arasında, en yüksek mekanik özellikler, CaCl2-etanol ile koagüle olan ve dispersiyonu 15 000 devir/dakika, 90 dakika şeklinde hazırlanan numunelerde görülmüştür. Diğer taraftan NaOH-aseton ile koagüle edilen numuneler en düşük mekanik özelliklere sahip olmuştur. Tüm numuneler elektrik iletkenliği bakımından yarı iletken malzeme grubuna girmektedir (10-4 S/cm)

Keywords

Grafen Oksit Lifi, Yaş Çekim Metodu, Koagülasyon Banyosu, Dispersiyon Oranı, Dispersiyon Süresi

THE EFFECT OF DISPERSION PREPARATION TYPE AND LAST COAGULATION BATH ON GRAPHENE OXIDE FIBERS PRODUCED BY WET SPINNING TECHNIQUE

Abstract

Graphene oxide (GO) fiber is a promising material because of its unique properties such as high electrical conductivity, good thermal and mechanical properties and scalable production. It can have widespread usage area such as energy storage devices, sensors, catalysis, biological applications. As seen from literatures, the studies on GO fiber produced by wet spinning technique are very limited because only a few years ago, the studies on this area were started. In this study, different dispersion rate, different dispersion time and different content of acetone in the last coagulation bath have been studied. Thus, for the first time, the effect of preparation method of GO dispersion and the content of highly evaporative solvent in the last coagulation bath on mechanical and electrical properties of GO fiber have been examined. It has been seen that dispersion rate has higher positive effect on mechanical properties than dispersion time. The samples lasted by %100 acetone coagulation bath have a lower mechanical property than the sample lasted by % 20/80 (distilled water/acetone). Among samples, highest mechanical properties belong to sample with coagulated by CaCl2-ethanol and dispersed for 90 minute by 15 000 rpm. Meanwhile coagulated samples with NaOH-acetone had the lowest mechanical properties. With regard to electrical conductivity, all samples are in the semi conductive range (10-4 S/cm)

Keywords

Graphene Oxide Fiber, Wet Spinning, Coagulation Bath, Dispersion Rate, Dispersion Time, Electrical Conductivity

References

• 1. Cong, H, Ren, X, Wang, P, 2012, “Wet-spinning assembly of continuous, neat, and macroscopic graphene fibers”, Scientific Reports, August, 1-6.
• 2. Das, K, Maiti, S, Ghosh, M, 2013, “Graphene oxide in cetyltrimethylammonium bromide (CTAB) reverse micelle: A befitting soft nanocomposite for improving efficiency of surface-active enzymes”, Journal of Colloid and Interface Science, January, 395, 111-118.
• 3. Chen, L, He, Y, Chai, S, 2013, “Toward high performance graphene fibers”, Nanoscale, April, 5, 5809-5815.
• 4. Xu, Z, Gao, C, 2014, “Graphene in Macroscopic Order: Liquid Crystals and Wet-Spun Fibers”, Accounts of Chemical Research, February, 47, 1267-1276.
• 5. Shen, H, Zhang, L, Liu, M, 2012, “Biomedical Applications of Graphene”, Theranostics, March, 2 (3), 283-294.
• 6. Kim, Y, Kang, J, Kim, T, 2014, “Easy Preparation of Readily Self-Assembled High-Performance Graphene Oxide Fibers”, Chemistry of Materials, August, 26, 5549-5555.
• 7. Xu, Z, Sun, H, Zhao, X, 2013, “Ultrastrong Fibers Assembled from Giant Graphene Oxide Sheets”, Advanced Materials, 25, 188-193.
• 8. Jalili, R, Aboutalebi, S, Esrafilzadeh, D, 2013, “Scalable One-Step Wet-Spinning of Graphene Fibers and Yarns from Liquid Crystalline Dispersions of Graphene Oxide: Towards Multifunctional Textiles”, Advanced Functional Materials, November, 43 (23), 5345-5354.
• 9. Huang, T, Zheng, B, Kou, L, 2013, “Flexible high performance wet-spun graphene fiber supercapacitors”, RSC Advances, September, 46 (3), 23957-23962.
• 10. Xu, Z, Liu, Z, Sun, H, 2013, “Highly Electrically Conductive Ag-Doped Graphene Fibers as Stretchable Conductors”, Advanced Materials, June, 23 (25), 3249-3253.
• 11. Aboutalebi, S, Jalili, R, Esrafilzadeh, D, 2014, “High-Performance Multifunctional 1. Graphene Yarns: Toward Wearable All-Carbon Energy Storage Textiles”, Acs Nano, February, 3 (8), 2456-2466.
• 12. Xiang, C, Young, C, Wang, X, 2013, “Large Flake Graphene Oxide Fibers with Unconventional 100% Knot Effi ciency and Highly Aligned Small Flake Graphene Oxide Fibers”, Advanced Materials, September, 33 (25), 4592-4597.
• 13. Xu, Z, Gao, C, 2011, Graphene chiral liquid crystals and macroscopic assembled fibres”, Nature Communications, December, 571 (2), 1-9.
• 14. Dong, Z, Jiang, C, Cheng, H, 2012, “Facile Fabrication of Light, Flexible and Multifunctional Graphene Fibers”, Advanced Materials, April, 14 (24), 1856-1861.
• 15. Jang, E, Gonzalez, J, Choi, A, 2012, “Fibers of reduced graphene oxide nanoribbons”, Nanotechnology, May, 23 (23), 1-8.
• 16. Zhao, Y, Jiang, C, Hu, C, 2013, “Large-Scale Spinning Assembly of Neat, Morphology-Defined, Graphene-Based Hollow Fibers”, Acs Nano, February, 3 (7), 2406-2412.
• 17. Li, X, Zhao, T, Wang, K, 2011, “Directly Drawing Self-Assembled, Porous, and Monolithic Graphene Fiber from Chemical Vapor Deposition Grown Graphene Film and Its Electrochemical Properties”, Langmuir, August, 27 (19), 12164–12171.
• 18. Hummers, W, Offeman, R, 1958, “Preparation of Graphitic Oxide”, Journal of the American Chemical Society, March, 80 (6), 1339.
• 19. Pei, S, Cheng, H, 2012, “The reduction of graphene oxide”, Carbon, August, 9 (50), 3210-3228.
• 20. Pei, S, Zhao, J, Ren, W, 2010, “Direct reduction of graphene oxide films into highly conductive and flexible graphene films by hydrohalic acids”, Carbon, December, 15 (48), 4466-4474.
• 21. Hofmann, H, 1932, "Evaporation rates of organic liquids." Industrial & Engineering Chemistry, February, 24 (2), 135-140.
• 22. Retrieved May 26, 2015 from: http://www.britannica.com/EBchecked/topic/533942 /semiconductor/images-videos
• 23. Retrieved May 10, 2015 from: http://www.polimerler.com/iletken%20polimerler/ile tken%20polimerler.htm