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Geopolymerization involves a chemical reaction between aluminosilicate raw materials (in an amorphous state) and highly concentrated alkali silicate–hydroxide solutions yielding amorphous to semi-crystalline three-dimensional polymeric structures.
“Green chemistry for sustainable cement production and use”.

The heat effect might be assigned to a constituent that cannot be revealed by X-rays (due to its low concentration or highly defective structure) or to annealing of some defects.
Schwarz, Coordination Chemistry Reviews 248 (2004) 493

Silicon carbide SiC, prepared as a mixture of the commercially available β-SiC powder (HSC-0.59, Superior Graphite) with additives of 2.8%Al2O3, 5.7%Y2O3, and 5%Si3N4, hot pressed at 1870°C/1h in atmosphere of N2, and subsequently annealed at 1650°C/5h, prepared at the Institute of Inorganic Chemistry, Slovak Academy of Sciences, in Bratislava.
COST-0042-06, by the Slovak Grant Agency VEGA 2/7194/27, by NANOSMART Centre of Excellence Slovak Academy of Sciences, by HANCOC-MNT.ERANET, by COST Action 539, by European Structural Fund - Center of Excellence (Progressive Materials with Nano- and Submicron-Structure): ITMS NFP code 262200120019, by APVV-017106 and LPP-0203-07.

This analysis helps determine the extent to which polymer chains have bonded to form a gel-like structure rather than remaining as individual chains.
Materials Today Chemistry, 23, 100746. https://doi.org/10.1016/j.mtchem.2021.100746 [4] Kass, L.

Activated carbon with well-developed pore structures, large internal surface area and a variety of active groups can be employed as an adsorbent for NO.
XIE, “Adsorption of Carbon Dioxide on Activated Carbon”.Journal of Natural Gas Chemistry, pp.223-229, 2006, Available online

., "Development of a stack having an optimized flow field structure with low cross transport effects", Journal of Power Sources Vol.155, P.60–65, (2006)
Ku¨ver, Methanol oxidation and direct methanol fuel cells: a selective review, Journal of Electroanalytical Chemistry, Vol. 461, P. 14–31, (1999)

Introduction Shrinkage, one of the main factors in determination of the endurance of concrete structure, is a very important property of concrete attracting researcher’s attention for decades since excessive shrinkage is blamed for leading concrete to crack, even fail.
On the Chemistry of cement, Washington DC, pp.659-694

This property allows the specimen to be extruded repeatedly in order to accumulate strain, allowing one to control the structure and properties of the specimen.
Varyukhin / NATO Science Series, II Mathematics, Physics and Chemistry, Vol. 212 (2006), p.253

Various accounts on the complex structure of these oxide scales have been studied for many years.
c) The effect of water vapor on surface chemistry/ energy.

In fact, interlayer spacing between pristine graphene’s lattice structures is approximately of 3.4 Å [1].
Theoretically, A-A bilayer structure can be defined as second carbon atom layer is stacked on the first carbon atom layer [6].
Whereas, twisted bilayer structure can be determined as the upper carbon-based layer is rotated with the bottom carbon-based layer by specific rotation’s angle.
The Bernal phase structure is identified as the most stable system by controlling half of the upper layer’s carbon atoms stacked on bottom layer of carbon atoms, whereas the remaining structure is covered by different materials [7].
Neto, Graphene bilayer with a twist: electronic structure.