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Tuning The Thermal Conductivity of Lignin@Fe₃O₄ Colloidal Suspension Through External Magnetic Field.

Gautam, Bishal
http://orcid.org/0000-0003-0660-7578
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1671034996620314

Abstract Details

2022, Master of Science (M.S.), University of Dayton, Chemical Engineering.
Nanoparticle additives increase the thermal conductivity of conventional heat transfer fluids like water at low concentrations, which could lead to improved heat transfer fluids and processes. In this study, lignin-based Fe₃O₄ nanoparticles (lignin@Fe₃O₄ ) are investigated as a novel bio-based magnetic nanoparticle additive to enhance the thermal conductivity of aqueous-based fluids. Kraft lignin was used to encapsulate the Fe₃O₄ nanoparticles to increase the dispersion rate and prevent agglomeration and oxidation of the magnetic nanoparticles. Lignin@Fe₃O₄ nanoparticles were prepared using a co-precipitation method and characterized by various experimental techniques, including Transmission Electron Microscopy (TEM) and Vibrating Sampling Magnetometry (VSM). Once fully characterized, lignin@Fe₃O₄ nanoparticles were dispersed in aqueous 0.1 % w/v agar-water solutions at five low concentrations: 0.001 %w/v, 0.002 %w/v, 0.003 %w/v,0.004 %w/v and 0.005 %w/v. Thermal conductivity was measured using METER Group’s KD-3 Tempos and the transient line heat source method was used at five different temperature conditions: 25 °C, 30 °C, 35 °C, 40 °C, and 45 °C. Additionally, at room temperature, the thermal conductivity of aqueous-based lignin@Fe₃O₄ suspensions was characterized at the following magnetic fields of 0 Gauss, 100 Gauss, 200 Gauss, 300 Gauss, and 400 Gauss. This study shows an increment of thermal conductivity by about 10% in the highest concentrations and temperature conditions. Additionally, the study also demonstrated the increment of thermal conductivity up to 5% in 200 Gauss magnetic field strength in the highest concentrations at a constant room temperature of 21 °C. This work establishes that lignin-based Fe₃O₄ nanosuspension increases the thermal conductivity of aqueous-based fluids and has the potential to enhance the thermal conductivity of conventional heat transfer fluids.
Eric Vasquez, Ph.D (Committee Chair)
Soubantika Palchoudhury, Ph.D (Committee Member)
Kevin Myers, D.Sc (Committee Member)
Chemical Engineering; Materials Science; Nanoscience
Thermal conductivity; Lignin@Fe₃O₄ Colloidal Suspension; External Magnetic Field; Nanoparticle Additives; Conventional Heat Transfer Fluid; Agar water.

Recommended Citations

Citations

  • Gautam, B. (2022). Tuning The Thermal Conductivity of Lignin@Fe₃O₄ Colloidal Suspension Through External Magnetic Field. [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1671034996620314

    APA Style (7th edition)

  • Gautam, Bishal. Tuning The Thermal Conductivity of Lignin@Fe₃O₄ Colloidal Suspension Through External Magnetic Field. 2022. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1671034996620314.

    MLA Style (8th edition)

  • Gautam, Bishal. "Tuning The Thermal Conductivity of Lignin@Fe₃O₄ Colloidal Suspension Through External Magnetic Field." Master's thesis, University of Dayton, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1671034996620314

    Chicago Manual of Style (17th edition)

dayton1671034996620314
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This open access ETD is published by University of Dayton and OhioLINK.