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University of California – Irvine

1. Unangst, Jaclynn Liann. Salophen Sol-Gel Hybrid Sorbent Material for the Sensing and Sequestration of Actinyl Ions.

Degree: Materials Science and Engineering, 2019, University of California – Irvine

Radioactive materials require special management and considerations. From a non-proliferation standpoint, their presence may indicate a nuclear security threat. Whether they are elements to be recovered from used nuclear fuel or contaminants to be removed from a body of water, the separation, concentration and identification of these materials is imperative for nuclear energy and security to succeed. Functionalized sorbent materials can be designed for enhanced sequestration of radioactive materials present in these aqueous environments. The salophen Schiff base has demonstrated potential as a selective actinyl ion (U, Np, Pu) chelator during solvent extraction. Incorporating this ligand into a solid sorbent material may increase its potential by facilitating the concentration and containment of radioactive ions into a compact solid. In this work, a salophen Schiff-base sorbent material if formed through silica xerogel sol-gel co-condensation polymerization and a (triethoxysilyl)propyl modification to one side of the salophen for covalent inclusion. The nonsymmetrical ligand is therefore tethered to the xerogel at only one point, forming an actinyl ion-selective hybrid sorbent material. This sorbent has shown superior uptake to its symmetrically tethered counterpart as well as a commercial material for the removal of uranium from aqueous solutions. In addition, the sorbent can be further adapted utilizing a phenylene bridged polysilsesquioxane sol-gel polymerization. This sorbent material demonstrates potential to lessen the effects of ionizing radiation on the Schiff base ligand for the reprocessing of used nuclear fuel or the containment of high level radioactive waste. In the interest of nuclear security and owing to the chromophoric shift of the salophen ligand as it binds actinyl ions, the nonsymmetrical ligand can also be utilized as a solid optical thin film sensor for the detection of aqueous uranyl ions.

Subjects/Keywords: Materials Science; Chemistry; Nuclear engineering; hybrid sorbent materials; mesoporous silica; salophen Schiff base; solid extraction; thin film sensor; uranyl

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Unangst, J. L. (2019). Salophen Sol-Gel Hybrid Sorbent Material for the Sensing and Sequestration of Actinyl Ions. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/0h15735j

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Unangst, Jaclynn Liann. “Salophen Sol-Gel Hybrid Sorbent Material for the Sensing and Sequestration of Actinyl Ions.” 2019. Thesis, University of California – Irvine. Accessed October 17, 2019. http://www.escholarship.org/uc/item/0h15735j.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Unangst, Jaclynn Liann. “Salophen Sol-Gel Hybrid Sorbent Material for the Sensing and Sequestration of Actinyl Ions.” 2019. Web. 17 Oct 2019.

Vancouver:

Unangst JL. Salophen Sol-Gel Hybrid Sorbent Material for the Sensing and Sequestration of Actinyl Ions. [Internet] [Thesis]. University of California – Irvine; 2019. [cited 2019 Oct 17]. Available from: http://www.escholarship.org/uc/item/0h15735j.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Unangst JL. Salophen Sol-Gel Hybrid Sorbent Material for the Sensing and Sequestration of Actinyl Ions. [Thesis]. University of California – Irvine; 2019. Available from: http://www.escholarship.org/uc/item/0h15735j

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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