External electromagnetic field-aided freezing of CMC-modified graphene/water nanofluid

Graphene/water nanofluids with and without surfactant carboxyl methyl cellulose (CMC) were prepared using ultrasonic vibration. Surfactant CMC caused the change in the zeta potential of graphene/water nanofluid from 3.9mV to −53.1mV. The CMC-modified graphene/water nanofluid then froze with and without an external electromagnetic field and melted at room temperature. The particle size distributions and adsorption spectra of graphene/water nanofluid after a freeze/melt cycle at different current intensities were measured to evaluate the electromagnetic field effect on graphene rejection and engulfment by the advancing ice–water interface. Results show that (1) without an electromagnetic field, the absorbance of graphene/water nanofluid dramatically reduces, and a new peak of large particle size emerges after a freeze/melt cycle, thereby indicating that graphenes are partially rejected by the ice–water front and aggregate together; and (2) with an electromagnetic field, the adsorption spectra and the particle size distributions of graphene/water nanofluid do not significantly change after a freeze/melt cycle, thereby indicating that the graphenes are captured by the freezing interface and are uniformly distributed in the frozen body of graphene/water nanofluid. The electromagnetic field effect is closely related to the electric current intensity. Good thermal cycling stability can be achieved for graphene/water nanofluid in the current range of 0.07–0.12A. Mechanisms associated with surfactant adsorption, electromagnetic field, and possible gas evolution are proposed in this study to account for the behavior of graphenes in front of the ice–water interface.

[1]  M. Mehrali,et al.  Investigation of thermal conductivity and rheological properties of nanofluids containing graphene nanoplatelets , 2014, Nanoscale Research Letters.

[2]  Wenhua Yu,et al.  Comprar Nanofluids: Science and Technology | Sarit K. Das | 9780470074732 | Wiley , 2007 .

[3]  Zhengguo Zhang,et al.  Thermodynamic properties and thermal stability of ionic liquid-based nanofluids containing graphene as advanced heat transfer fluids for medium-to-high-temperature applications , 2014 .

[4]  Yu Feng,et al.  Experimental and theoretical studies of nanofluid thermal conductivity enhancement: a review , 2011, Nanoscale research letters.

[5]  Shusen Wu,et al.  Engulfment of Al2O3 particles during solidification of aluminum matrix composites , 1998 .

[6]  S. Kakaç,et al.  Enhanced thermal conductivity of nanofluids: a state-of-the-art review , 2010 .

[7]  B. Jönsson Surfactants and Polymers in Aqueous Solution , 1998 .

[8]  S. H. Davis,et al.  Particle capture in binary solidification , 2008, Journal of Fluid Mechanics.

[9]  A. Ganguli,et al.  Enhanced functionalization of Mn2O3@SiO2 core-shell nanostructures , 2011, Nanoscale research letters.

[10]  Shuangfeng Wang,et al.  Experimental study on thermophysical properties of nanofluids as phase-change material (PCM) in low temperature cool storage , 2012 .

[11]  Shuying Wu,et al.  Thermal energy storage behavior of Al2O3–H2O nanofluids , 2009 .

[12]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[13]  M. Worster,et al.  The interaction between a particle and an advancing solidification front , 1999 .

[14]  Hiroyuki Shibata,et al.  In-situ Observation of Engulfment and Pushing of Nonmetallic Inclusions in Steel Melt by Advancing Melt/Solid Interface , 1998 .

[15]  Tie-jun Shi,et al.  One-pot hydrothermal synthesis of a mesoporous SiO2–graphene hybrid with tunable surface area and pore size , 2012 .

[16]  H. Shibata,et al.  Observed behavior of various oxide inclusions in front of a solidifying low-carbon steel shell , 2010 .

[17]  M. S. Naghavi,et al.  Preparation and characterization of palmitic acid/graphene nanoplatelets composite with remarkable thermal conductivity as a novel shape-stabilized phase change material , 2013 .

[18]  Wenhua Yu,et al.  Nanofluids: Science and Technology , 2007 .

[19]  R. Velraj,et al.  Solidification behavior of water based nanofluid phase change material with a nucleating agent for cool thermal storage system , 2014 .

[20]  J. W. Garvin,et al.  Drag on a ceramic particle being pushed by a metallic solidification front , 2005 .

[21]  T. Teng Thermal conductivity and phase-change properties of aqueous alumina nanofluid , 2013 .

[22]  K. Leong,et al.  Thermophysical and electrokinetic properties of nanofluids – A critical review , 2008 .

[23]  Yu Feng,et al.  Experimental and theoretical studies of nanofluid thermal conductivity enhancement: a review , 2011, Nanoscale research letters.

[24]  Arun S. Mujumdar,et al.  A review on nanofluids - part II: experiments and applications , 2008 .

[25]  Xin Li,et al.  Study on the supercooling degree and nucleation behavior of water-based graphene oxide nanofluids PCM , 2015 .

[26]  Wettability switching of SDS-doped polyaniline from hydrophobic to hydrophilic induced by alkaline/reduction reactions. , 2012, Journal of colloid and interface science.

[27]  Emad Sadeghinezhad,et al.  Preparation, characterization, viscosity, and thermal conductivity of nitrogen-doped graphene aqueous nanofluids , 2014, Journal of Materials Science.

[28]  R. Asthana,et al.  The engulfment of foreign particles by a freezing interface , 1993, Journal of Materials Science.

[29]  P. Ajayan,et al.  Nanofluids based on fluorinated graphene oxide for efficient thermal management , 2014 .

[30]  D. Stefanescu,et al.  Melt convection effects on the critical velocity of particle engulfment , 1997 .

[31]  Zhengguo Zhang,et al.  A combined numerical and experimental study on graphene/ionic liquid nanofluid based direct absorption solar collector , 2015 .

[32]  Limin Qiu,et al.  Analysis of the nucleation of nanofluids in the ice formation process , 2010 .

[33]  E. Goharshadi,et al.  Electrical conductivity, thermal conductivity, and rheological properties of graphene oxide-based nanofluids , 2014, Journal of Nanoparticle Research.

[34]  K. Nakajima,et al.  Behavior of nonmetallic inclusions in front of the solid-liquid interface in low-carbon steels , 2000 .

[35]  D. Stefanescu,et al.  A Coupled Force Field-Thermal Field Analytical Model for the Evaluation of the Critical Velocity for Particle Engulfment , 1995 .

[36]  A. Moitra,et al.  Behavior of ceramic particles at the solid- liquid metal interface in metal matrix composites , 1988, Metallurgical and Materials Transactions A.