Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


BatraS_dis (final comments).pdf (6.79 MB)

ETD Abstract Container

Abstract Header

Field Assisted Self Assembly for Preferential Vertical Alignment of Particles and Phases Using a Novel Roll-to-Roll Processing Line

Batra, Saurabh
http://rave.ohiolink.edu/etdc/view?acc_num=akron1397227515

Abstract Details

2014, Doctor of Philosophy, University of Akron, Polymer Engineering.
The addition of nanoparticles in polymeric systems offers potential for new and unique material properties at low particle concentrations. This field has been heavily explored for mechanical and diffusion property enhancements, although with limited success. Many of these nanoparticles exhibit high anisotropy in their properties of interest including thermal conductivity, diffusivity, capacitance, optical, compressive strength, etc. However, traditional processing methods do not take advantage of these anisotropies as they are unable to orient the particles in the thickness direction. Therefore, directed assembly techniques are required. While a broad understanding of field assisted assembly techniques has already been established in the scientific community, there are still numerous practical questions that emerge in specific systems. The two most important things which lack in the previous literature are: i) ability to use field assisted assembly techniques in a roll-to-roll manufacturing process to create reconfigurable spatially oriented structures and ii) utilizing these assembly techniques for vertical orientation of particles, since most of the membranes and films for electronic devices require “Z”-oriented structures. This research, hence, focuses on increasing the understanding of field assisted assembly techniques to create a roll-to-roll process and “Z”-oriented particle chains using electric field. The first part of this study focused on the design and development of the roll-to-roll processing line and showed validating experiments on the performance of the machine at each zone which include electric, magnetic and thermal gradient zones. This was done to investigate general principles governing “Z orientation” behavior to produce “defect free” functional films with directionally enhanced properties. Alignment of clay platelets through electric field, magnetic nanowires with magnetic field, and directional crystallization of semicrystalline polymer using thermal gradient zone were done for validation. In the second study, fast transient evolution of electric field assisted thickness “Z”-direction orientation and assembly of clay particles was studied using an instrumented real time system that simultaneously measures in-plane and out of plane birefringence. The optical anisotropy master curves were developed that connect the exposure time and electric field strength with orientation, using a superposition principle. Z-oriented nanocomposite films manufactured through the R2R process showed enhanced through thickness ionic conductivity useful for membranes of batteries and fuel cells. The final study was divided into two parts and dealt with the manipulation of barium titanate nanoparticles to create flexible polymer films for ultra-capacitors. Application of AC electric fields in a well dispersed solution led to the formation of “Z”-oriented chains of BaTiO3 with single strands due to dielectrophoresis, whereas a formation of skin layer was observed with the application of DC fields. The first part of this study focused on the effect of frequency and viscosity on the alignment characteristics, and the second part focused on the effect of particle size.
Miko Cakmak, Dr. (Advisor)
Robert A. Weiss, Dr. (Committee Member)
David Simmons, Dr. (Committee Member)
Mesfin Tsige, Dr. (Committee Member)
Celal Batur, Dr. (Committee Member)
228 p.
Polymers
electric field; roll-to-roll; birefringence; directed assembly; clay nanocomposites, electro-optics; barium titanate; capacitors;

Recommended Citations

Citations

  • Batra, S. (2014). Field Assisted Self Assembly for Preferential Vertical Alignment of Particles and Phases Using a Novel Roll-to-Roll Processing Line [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1397227515

    APA Style (7th edition)

  • Batra, Saurabh. Field Assisted Self Assembly for Preferential Vertical Alignment of Particles and Phases Using a Novel Roll-to-Roll Processing Line . 2014. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1397227515.

    MLA Style (8th edition)

  • Batra, Saurabh. "Field Assisted Self Assembly for Preferential Vertical Alignment of Particles and Phases Using a Novel Roll-to-Roll Processing Line ." Doctoral dissertation, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1397227515

    Chicago Manual of Style (17th edition)

akron1397227515
1,813
© 2014, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.