Strain of plates of aluminum, glass, and silicon at sorption of water vapor

Size effect and mechanochemical contraction of the Si(100) specimens

“…Earlier it was shown that mechanochemical deformation, one of nanoeffects, takes place on compact objects (plates of aluminum, glass, and monocrystalline silicon) [2]. In the present work the precision of measurement of the sizes was increased ca.…”

“…It is reasonable to assume that the reduced (as compared to the center) thickness of these parts is connected with the quality of mechanical treatment of the water. Not excluding the possibility of such a technological defect, note, that in this case, as will be shown below, the decrease of the thickness ∆h = h w -h of the edge cells of the water grid has another reason caused by mechanochemical effects [2].…”

“…Therefore, as shown in [2], physical adsorption must lead to an increase in the linear sizes of the water. Chemisorption of water vapors in micropores leads to contraction of specimens.…”

“…In the present work the precision of measurement of the sizes was increased ca. twice (±0.25 µm) as compared to the data of [2].…”

“…Based on the data of the table the dependence ∆h = f(S/V) (Fig. 4) Earlier, the isotherms of sorbostriction on the plates of aluminum, glass, and monocrystalline silicon for sorption of water vapors were obtained [2]. The observed deformation (increase in the diameter of the plates by 6.8 µm and decrease in its thickness by 3.5 µm) was explained by superposition of two effects: the influence of the surface tension of the external surface of the specimens upon physical adsorption of water vapors, and effect of the process of chemisorption of H 2 O in micropores.…”