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Supriya S. Kanyal
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
David S. Jensen, Andrew J. Miles, Andrew E.
Dadson, Michael A. Vail
Diamond Analytics, Orem, Utah 84058
Rebecca Olsen
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
Fabien Scorza, Judy Nichols
CAMAG Scientific Inc., Wilmington, N.C. 28401
Richard R. Vanfleet, Robert C. Davis
Department of Physics, Brigham Young University, Provo, Utah 84602
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Matthew R. Linford (a)
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Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
(a) Electronic mail and correspondence: mrlinford@chem.byu.edu
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24 FTIR Analysis:
25 Fourier transform infrared spectroscopy of silica helps determines the nature of the material and
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27 its silanol groups. Spectra were collected in Kubelka-Munk units with a focus on the peak around
3740 cm
-1
. A peak position below this threshold signifies vicinal silanol groups which is
28 desirable for chromatography. Higher wavenumbers are attributed to more acidic, islolated
29 silanol groups that can cause tailing. Supporting Information, Figure 1 shows the FTIR spectra of
30 some of the materials analyzed in our study. The isolated silanol peaks appear at 3736.8, 3738.49
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-1
for the Analtech, Merck, and our TLC plate material, repectively.
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33 Supporting Information Figure 1. FTIR spectra of silica samples (preheated at 120 °C for 24 h).
34 (a) Black line: material from an Analtech TLC plate. (b) Red line: material from a Merck
35 HPTLC plate. (c) Green line: material from our microfabricated TLC plate .
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38 Supporting Information Figure 2. Separations of three analgesics on microfabricated TLC plates
39 using mobile phase compositions of (a) 4:1 toluene:acetonitrile (v/v) without TEA
40 (triethylamine), (b) 4:1 toluene:acetonitrile (v/v) with 1.0% (v/v) TEA, (c) 6:1
41 toluene:acetonitrile (v/v) without TEA, and (d) 4:1 toluene:acetonitrile (v/v) without TEA (using
42 a TLC plate with wider channels than the other plates).
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44 Supporting Information Figure 3. Histograms showing distributions of Fe nanoparticles for initial
45 Fe thicknesses of (a) 6 nm, (b) 8 nm, (c) 12 nm and (d) 18 nm.
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