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a very small pore
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmaɪ krəˌpɔr, -ˌpoʊr)

a tiny opening, as in specialized biological filters or in the shells of some animals.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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developed useful carbon molecular sieves based on carbonized vinylidene chloride copolymer with micropores having an average micropore size 3.0 to 5.0 Angstroms.
UNIVERSITY PARK, Pa., December 20, 2018 -- Micropores in fabricated tissues such as bone and cartilage allow nutrient and oxygen diffusion into the core, and this novel approach may eventually allow lab -grown tissue to contain blood vessels, according to a team of Penn State researchers.
Usually mesopore corresponding to intergranular pores are dominant, while the heavily cemented sandstones show large amounts of intercrystalline micropores. Thus the evaluation of the complex and heterogeneous beach-bar sandstone reservoir requires a comprehensive study program.
According to the pore classification method used in mercury intrusion porosimetry (MIP), pores are divided into macropores (d > 1 [micro]m), meso-pores (0.1 [micro]m < d [less than or equal to] 1 [micro]m), tiny pores (0.015 [micro]m < d [less than or equal to] 0.1 [micro]m) and micropores (d [less than or equal to] 0.015 [micro]m).
It can be seen that the surface of the MAO layer is uneven, and many micropores with various pore sizes distributing uniformly on the surface can be observed.
In the second time-span of 10 F-T cycles, left peaks of four pictures in Figure 6 gain a considerable growth while the right peaks basically remain the same, which means micropores increased rapidly while macropores had no evident change during this period.
In terms of the C[O.sub.2] capture by activated carbons, it has been reported that the narrow micropores play a decisive role in C[O.sub.2] adsorption capacity [20-23].
On one hand, micropores (pore size <2.0 nm) provide effective sites for ion adsorption-desorption, and mesopores (2.0 nm < pore size < 50 nm) play a dominant role in ion transportation [14].
A number of studies concluded that micropores and transitional pores are the primary space for CBM storage, whereas meso- and macropores are responsible for CBM migration [1, 25-31].
The dual layer technology is a good way to avoid the accumulated particle inside the micropores. However, the influence of micropore structure on deep bed filtration stage has not yet been reported, which is the first motivation of our study presented in this paper.