Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"Florida International University" +contributor:("Francisco A. Fernandez-Lima"). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Florida International University

1. Villacob, Raul A. Development of a Primary Ion Column for Mass Spectrometry-Based Surface Analysis.

Degree: MS, Chemistry, 2016, Florida International University

Secondary Ion Mass Spectrometry (SIMS) is a powerful technique for high spatial resolution chemical mapping and characterization of native surfaces. The use of massive cluster projectiles has been shown to extend the applicable mass range of SIMS and improve secondary ion yields 100 fold or beyond. These large projectiles however, present a challenge in terms of focusing due to the initial spatial and kinetic energy spreads inherent to their generation. In the present work, we describe the development and construction of a novel primary ion (PI) column employing a gold nanoparticle – liquid metal ion source (AuNP-LMIS) and the coupling to ultrahigh resolution mass spectrometers (e.g., Fourier Transform Ion Cyclotron Resonance Mass Spectrometer, FT-ICR MS) for accurate chemical characterization of complex biological surfaces. This work describes the ion dynamics, development and the experimental characterization of the AuNP-LMIS. Advisors/Committee Members: Francisco A. Fernandez-Lima, Piero Gardinali, Jeffrey Joens.

Subjects/Keywords: Mass Spectrometry; Analytical Chemistry; Scientific Instrumentation Development; Focused Ion Beams; Surface Analysis; Mass Spectrometry Imaging; Nanoscale Imaging; Analytical Chemistry

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Villacob, R. A. (2016). Development of a Primary Ion Column for Mass Spectrometry-Based Surface Analysis. (Thesis). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/2561 ; 10.25148/etd.FIDC000761 ; FIDC000761

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):

Villacob, Raul A. “Development of a Primary Ion Column for Mass Spectrometry-Based Surface Analysis.” 2016. Thesis, Florida International University. Accessed September 20, 2020. https://digitalcommons.fiu.edu/etd/2561 ; 10.25148/etd.FIDC000761 ; FIDC000761.

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

MLA Handbook (7th Edition):

Villacob, Raul A. “Development of a Primary Ion Column for Mass Spectrometry-Based Surface Analysis.” 2016. Web. 20 Sep 2020.

Vancouver:

Villacob RA. Development of a Primary Ion Column for Mass Spectrometry-Based Surface Analysis. [Internet] [Thesis]. Florida International University; 2016. [cited 2020 Sep 20]. Available from: https://digitalcommons.fiu.edu/etd/2561 ; 10.25148/etd.FIDC000761 ; FIDC000761.

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

Council of Science Editors:

Villacob RA. Development of a Primary Ion Column for Mass Spectrometry-Based Surface Analysis. [Thesis]. Florida International University; 2016. Available from: https://digitalcommons.fiu.edu/etd/2561 ; 10.25148/etd.FIDC000761 ; FIDC000761

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


Florida International University

2. Jonah, Tosin Mobolaji. Selective Sensing of Ions and Ion Pairs of Environmental and Forensic Significance.

Degree: PhD, Chemistry, 2017, Florida International University

Dual-host combinations of cation and anion sensors have unique potential for selective detection of ion pairs, such as NH4NO3, via solvent extraction. Selective sensors for NH4+ and NO3- were synthesized and used together for ion-pair sensing of ammonium nitrate both in organic solvents (using Bu4N+NO3 - and NH4+PF6-) and in extraction of NH4NO3 from water into dichloromethane. A fluorescent sensor for NH4+ based on 1,3,5-triethylbenzene shows remarkable binding and sensing selectivity for NH4+ vs. K+. Fluorescence and 1H-NMR titrations reveal surprising differences in sensing properties and binding constants for the tris-(3,5-dimethyl)pyrazole vs. the tris(3,5-diphenyl)pyrazole. The role of ion pairing and solvation is revealed by X-ray and theoretical DFT studies. We have also demonstrated a unique dual-host extraction-based ion-pair sensing paradigm using Förster Resonance Energy Transfer (FRET), showing selectivity for NH4NO3. The fluorescence emission of the NH4+ sensor tris-(3,5-dimethyl)pyrazole (305-340 nm), is compatible with the excitation wavelength of the dansyl fluorophore of the nitrate sensor 1,3,5-Tris-(5-dimethylamino-1-naphthalenesulfonamido)methyl]-2,4,6-triethylbenzene, thus resulting in FRET emission upon combined use of these two sensors for the NH4NO3 ion pair. Contact of dichloromethane solutions containing the two hosts with aqueous solutions of NH4NO3 (1 x 10-5 M to 1 x 10-4 M ), resulted in FRET fluorescence enhancements at 510 nm, with increasing concentrations of NH4NO3, while NaNO3, KNO3, NaCl and KCl showed only minimal fluorescence responses, under identical conditions. The ability of the tris-pyrazole to bind cations, such as NH4+, was also exploited in a detailed fluorescence and 1H-NMR Ln(III), binding study using tris-pyrazoles with varying substitution patterns. The dependence of fluorescence responses on pyrazole substitution that had been observed for NH4+ was also observed for different Ln(III), indicating the significant role of ion pairing for Ln(III) binding and fluorescence sensing. Likewise, the tris-dansyl nitrate receptor, in its deprotonated form, was also found to be an efficient Hg(II) fluorescent sensor. An X-ray crystal structure showed the ability of the trianionic version of this receptor to bind three Hg(II) atoms, also containing three CH3COO- counteranions. The X-ray crystal structure of the same receptor with HgCl2 gave a 2:1 complexation pattern, with one Hg atom complexed by two bis-deprotonated receptor molecules Advisors/Committee Members: Konstantinos Kavallieratos, José R. Almirall, Bruce R. McCord, Francisco A. Fernandez-Lima, Chenzhong Li.

Subjects/Keywords: ions; Ion-pairing; pyrazole; ammonium ion; dual- host receptor; dual host; Life Sciences

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Jonah, T. M. (2017). Selective Sensing of Ions and Ion Pairs of Environmental and Forensic Significance. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/3498 ; 10.25148/etd.FIDC004059 ; FIDC004059

Chicago Manual of Style (16th Edition):

Jonah, Tosin Mobolaji. “Selective Sensing of Ions and Ion Pairs of Environmental and Forensic Significance.” 2017. Doctoral Dissertation, Florida International University. Accessed September 20, 2020. https://digitalcommons.fiu.edu/etd/3498 ; 10.25148/etd.FIDC004059 ; FIDC004059.

MLA Handbook (7th Edition):

Jonah, Tosin Mobolaji. “Selective Sensing of Ions and Ion Pairs of Environmental and Forensic Significance.” 2017. Web. 20 Sep 2020.

Vancouver:

Jonah TM. Selective Sensing of Ions and Ion Pairs of Environmental and Forensic Significance. [Internet] [Doctoral dissertation]. Florida International University; 2017. [cited 2020 Sep 20]. Available from: https://digitalcommons.fiu.edu/etd/3498 ; 10.25148/etd.FIDC004059 ; FIDC004059.

Council of Science Editors:

Jonah TM. Selective Sensing of Ions and Ion Pairs of Environmental and Forensic Significance. [Doctoral Dissertation]. Florida International University; 2017. Available from: https://digitalcommons.fiu.edu/etd/3498 ; 10.25148/etd.FIDC004059 ; FIDC004059

.