Outline. Scientific Method of Research. Group Meeting Presentation 1/23/2004 Prof. T. Dobbins. Scientific Research Method Development of Mathematical Models Applying these methods to completing an MS Thesis or a Ph.D. Thesis.
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Scientific Method of Research
Group Meeting Presentation
Prof. T. Dobbins
Scientific Research – 1: investigation or experimentation aimed at the discovery and interpretation of facts, revision of accepted theories or laws in the light of new facts, or practical application of such new or revised theories or laws2: the collecting of information about a particular subject
Scientific Method of ResearchFour Steps:
Further reading found at http://teacher.nsrl.rochester.edu/phy_labs/AppendixE/AppendixE.html
Keys to Implementation in your Research:
Sorting Observations (from Literature Searches):
Note Results (in report format- optional) for future use in confirming/denying your hypothesis (once your hypothesis is found)!
Test: EXAFS Absorption spectroscopy can measure bond length and # of bonds. We may dope NaAlH4 with Ti2+, Ti3+ and Ti4+ and measure bond length of each. If they are the same, then they have all assumed one oxidation state after entering the structure (and we can measure this oxidation state also using EXAFS by determining the # of bonds).
Prediction 1: If Ti2+, Ti3+ and Ti4+ gain equivalent oxidation states after entering the structure, then the same should be true for Co2+, Co3+, and Co4+ (or any other metal dopant).
Prediction 2: If Ti2+, Ti3+ and Ti4+ gain equivalent oxidation states after entering the structure via ball-milling, then the same should be true for Ti2+, Ti3+, and Ti4+ after entering the structure via chemical precipitation from Na+, Al3+, and Ti?+ salt solutions.
Test: EXAFS Absorption spectroscopy data is in hand. Prediction 1: If Ti2+, Ti3+ and Ti4+ gain equivalent oxidation states after entering the structure, then the same should be true for Co2+, Co3+, and Co4+ (or any other metal dopant).
Model: We use FEFF8.0, WINXAFS to fit the XAFS equation to measured data --- varying types of neighboring species (e.g. neighbors may be 2 Na atoms and 1 Al atom or 3 Al atoms and 1 Na atom). bond length and # of bonds (coordination number) until we have a good fit. We did not know what environment our Ti atom was in prior to model fitting, now, we have modeled our system to match our data. Our model is then made up of the XAFS equation, bond lengths, and # of bonds.
Good Luck and Happy Researching!!!