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. 2019 Jan 6;12(1):156. doi: 10.3390/ma12010156

Figure 2.

Figure 2

SEM-micrographs displaying some characteristic features of silica gels precipitated from various silicate treatments (gels are clearly visible by their grey value): (a) the adhesion of KSE 300 gel to St. Margarethen Limestone due to the advantageous topography of the grain boundary, (b) worse adhesion of KSE 300 gel to Schlaitdorf sandstone, (c) the shrinkage of NC-25C gel in intergranular pores of Schlaitdorf Sandstone, and (d) the interpenetration of the NC-27CP gel (shown in pseudo-colour-imaging) into the clayey matrix of Schlaitdorf Sandstone.