Characterization of Class F Fly Ash Using STXM: Identifying Intraparticle Heterogeneity at Nanometer Scale

<div>STXM image map of Class F fly ash at (a) Fe <svg height="12.7386pt" id="M3" style="vertical-align:-4.350619pt" version="1.1" viewbox="-0.0498162 -8.38798 25.676 12.7386" width="25.676pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M495 163C480 117 462 85 444 65C421 39 387 34 332 34C290 34 256 36 236 47C218 57 213 77 213 131V526C213 612 222 616 301 622V650H40V622C122 616 128 611 128 526V126C128 41 120 34 36 28V0H489C498 31 519 126 525 157L495 163Z" id="g121-74"></path><glyph.data ascent="989" descent="-360" horiz-adv-x="538" vert-adv-y="538"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,6.994,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,10.161,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,13.328,3.132)"><path d="M98 134C72 134 46 117 46 90C46 73 55 65 60 64C95 55 124 32 124 -4C124 -42 95 -68 44 -89L57 -123C122 -104 194 -60 194 22C194 94 136 134 98 134Z" id="g50-45"></path><glyph.data ascent="3443" descent="-2856" horiz-adv-x="237" vert-adv-y="237"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,15.484,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,18.651,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,21.818,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g></svg>-edge; (b) Si K-edge. NEXAFS spectra of sample taken from various regions as shown in the image map for (c) Fe <svg height="12.7386pt" id="M4" style="vertical-align:-4.350619pt" version="1.1" viewbox="-0.0498162 -8.38798 25.676 12.7386" width="25.676pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M495 163C480 117 462 85 444 65C421 39 387 34 332 34C290 34 256 36 236 47C218 57 213 77 213 131V526C213 612 222 616 301 622V650H40V622C122 616 128 611 128 526V126C128 41 120 34 36 28V0H489C498 31 519 126 525 157L495 163Z" id="g121-74"></path><glyph.data ascent="989" descent="-360" horiz-adv-x="538" vert-adv-y="538"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,6.994,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,10.161,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,13.328,3.132)"><path d="M98 134C72 134 46 117 46 90C46 73 55 65 60 64C95 55 124 32 124 -4C124 -42 95 -68 44 -89L57 -123C122 -104 194 -60 194 22C194 94 136 134 98 134Z" id="g50-45"></path><glyph.data ascent="3443" descent="-2856" horiz-adv-x="237" vert-adv-y="237"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,15.484,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,18.651,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,21.818,3.132)"><path d="M308 0V33C225 38 217 44 217 128V521C217 605 225 612 308 617V650H39V617C122 612 130 605 130 521V128C130 44 122 38 39 33V0H308Z" id="g58-71"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="348" vert-adv-y="348"></glyph.data></g></svg>-edge; (d) Si K-edge.</div>

Journal of Nanomaterials

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Figure 3

Figure 3: Characterization of Class F Fly Ash Using STXM: Identifying Intraparticle Heterogeneity at Nanometer Scale 