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A GENERALIZED METHOD FOR ALIGNMENT OF BLOCK COPOLYMER FILMS AND LARGE-SCALE FABRICATION OF TEMPLATED MESOPOROUS MATERIALS

Qiang, Zhe
http://rave.ohiolink.edu/etdc/view?acc_num=akron1479221944217468

Abstract Details

2016, Doctor of Philosophy, University of Akron, Polymer Engineering.
Macroscopic alignment of block copolymer domains in thin films is desired for many applications, such as cell responsive surfaces or optical polarizers. Alignment generally requires specialized tools that apply external fields, shear force gradient, or produce topological patterned substrates. This requirement limits the broad academic application of aligned BCPs. Here, we describe a simple modification of commonly utilized solvent vapor annealing (SVA) process for macroscopic alignment of BCPs. Adhering a flat, crosslinked elastomer pad to the BCP film leads to differential swelling between the elastomer pad and BCP to produce a shear force that aligns the ordered BCP domains. The role of elastomer properties, solvent quality, drying rate and degree of segregation of the block copolymer will be discussed to provide generalized rules for alignment with this technique. By proper selection of the BCP and functional precursors, functional nanopatterns can be obtained such as silica nanolines, rhombic arrays and highly aligned porous carbon films. Roll-to-roll (R2R) processing enables the rapid fabrication of large-area sheets of cooperatively assembled materials for production of mesoporous materials. Evaporation induced self-assembly of a nonionic surfactant with sol-gel precursors and phenolic resin oligomers produces highly ordered mesostructures for a variety of chemistries including silica, carbon, tin oxide and titania. The cast film can be easily delaminated from the carrier substrate after crosslinking the resol to produce meter-long self-assembled sheets. The pore textures including surface areas, pore size and pore volume can be effectively controlled by tuning the processing conditions. Moreover, inclusion of dopants in the multi-component solution for cooperative assembly leads to additional functionality of these mesoporous materials. The performance of as-synthesized materials as electrodes for batteries or for dye removal will also be discussed in this dissertation.
Bryan Vogt (Advisor)
Kevin Cavicchi (Advisor)
Sadhan Jana (Committee Chair)
Zhu Yu (Committee Member)
Zhu Jiahua (Committee Member)
438 p.
Polymers
block copolymer; mesoporous materials; alignment

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Citations

  • Qiang, Z. (2016). A GENERALIZED METHOD FOR ALIGNMENT OF BLOCK COPOLYMER FILMS AND LARGE-SCALE FABRICATION OF TEMPLATED MESOPOROUS MATERIALS [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1479221944217468

    APA Style (7th edition)

  • Qiang, Zhe. A GENERALIZED METHOD FOR ALIGNMENT OF BLOCK COPOLYMER FILMS AND LARGE-SCALE FABRICATION OF TEMPLATED MESOPOROUS MATERIALS. 2016. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1479221944217468.

    MLA Style (8th edition)

  • Qiang, Zhe. "A GENERALIZED METHOD FOR ALIGNMENT OF BLOCK COPOLYMER FILMS AND LARGE-SCALE FABRICATION OF TEMPLATED MESOPOROUS MATERIALS." Doctoral dissertation, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1479221944217468

    Chicago Manual of Style (17th edition)

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© 2016, some rights reserved.Creative Commons License A GENERALIZED METHOD FOR ALIGNMENT OF BLOCK COPOLYMER FILMS AND LARGE-SCALE FABRICATION OF TEMPLATED MESOPOROUS MATERIALS by Zhe Qiang is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.