effect of functionalization process on thermal conductivity of graphene nanofluids

نویسندگان

a. ghozatloo

faculty member of research institute of petroleum industry (ripi), west blvd. azadi sport complex, p.o. box: 14665-137, tehran, iran m. shariaty niassar

transport phenomena & nanotech. lab (tpnt), school of engineering, university of tehran, p.o. box: 11155-4563, tehran, iran a. rashidi

faculty member of research institute of petroleum industry (ripi), west blvd. azadi sport complex, p.o. box: 14665-137, tehran, iran

چکیده

in this research, graphene was synthesized by chemical vapor deposition (cvd) method in atmosphere pressure (14.7 psi). different functionalization method was used for oxidizing of graphene such as acid and alkaline treatments. the functionalized graphene (fg) was characterized by ftir and raman spectroscopy. nanofluid with water and different concentration (0.05, 0.15 and 0.25 wt %) of fg were prepared. thermal conductivity of nanofluids was measured by transient hot wire method. the acid functionalization introduces significant defects in graphene structure, degrading its unique properties such as superior carrier mobility, mechanical strength and chemical stability. in alkali functionalization method, the graphene is not effectively defected. therefore, the transport properties of graphene maintained and this method showed enhancement in thermal conductivity more than acid fictionalization in same conditions. in optimum condition (0.25 wt % graphene of alkaline method in water), thermal conductivity ratio were increased (24.4% at 20°c and 33.9% at 60°c).

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effect of Functionalization Process on Thermal Conductivity of Graphene Nanofluids

   In this research, Graphene was synthesized by chemical vapor deposition (CVD) method in atmosphere pressure (14.7 psi). Different functionalization method was used for oxidizing of graphene such as acid and alkaline treatments. The Functionalized graphene (FG) was characterized by FTIR and Raman spectroscopy. Nanofluid with water and different concentration (0.05, 0.15 and 0.25 wt %) of ...

متن کامل

Functionalization effect on the thermal conductivity of graphene- polymer nanocomposites

(2014) Surface functionalization on the thermal conductivity of graphene–polymer nanocomposites. which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted. Notice: Changes introduced as a result of publishing processes such as copy-editing and formatting may not be reflec...

متن کامل

Thermal Conductivity of Nanofluids

Nanofluids are suspensions of nanoparticles in base fluids, a new challenge for thermal sciences provided by nanotechnology. Nanofluids have unique features different from conventional solid-liquid mixtures in which mm or μm sized particles of metals and non-metals are dispersed. Due to their excellent characteristics, nanofluids find wide applications in enhancing heat transfer. Research work ...

متن کامل

Thermal conductivity enhancement of nanofluids containing graphene nanosheets

Related Articles Towards a mesoscopic model of water-like fluids with hydrodynamic interactions J. Chem. Phys. 135, 124902 (2011) A semiclassical study of the thermal conductivity of low temperature liquids J. Chem. Phys. 135, 114105 (2011) Rheological properties of alumina nanofluids and their implication to the heat transfer enhancement mechanism J. Appl. Phys. 110, 034316 (2011) Reverse none...

متن کامل

effect of oral presentation on development of l2 learners grammar

this experimental study has been conducted to test the effect of oral presentation on the development of l2 learners grammar. but this oral presentation is not merely a deductive instruction of grammatical points, in this presentation two hypotheses of krashen (input and low filter hypotheses), stevicks viewpoints on grammar explanation and correction and widdowsons opinion on limited use of l1...

15 صفحه اول

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
international journal of nanoscience and nanotechnology(ijnn

جلد ۱۳، شماره ۱، صفحات ۱۱-۱۸

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023