The phrase "a dense surface" is correct and usable in written English.
It can be used to describe a surface that is thick, compact, or closely packed together, often in a scientific or technical context.
Example: "The geologist noted that the rock formation had a dense surface, making it difficult for water to penetrate."
Alternatives: "a compact surface" or "a thick surface".
For Ni microparticles, a dense surface were observed during the redox reaction.
TiO2 film deposited by the EFMS technique had a dense surface morphology consisting of smaller particles.
Loose sandy soils consisting of wind-borne deposits and riverine sands are found in the northern regions, although, in areas where there is a marked dry season, a dense surface layer of laterite develops, making these soils difficult to cultivate.
However, polydopamine deposition is a time-consuming process that usually requires 24 h to produce a dense surface coating.
A dense surface structure of cement-based material is important for its resistance to the impacts of environment.
In this study, a gradient MoSi2-borosilicate glass coating with a dense surface layer and a porous interlayer was designed for mullite fibrous ceramics.
The results showed that the FCS-SiC coating possessed a denser surface with smaller grain sizes.
Pore formation during the activation process progresses in two steps due to the existence of a denser surface layer and a more porous core material.
When the spinneret temperature was increased from 25 °C to 50 °C, the mean effective pore radius and the pure water permeability were simultaneously decreased, which was due to the formation of a denser surface skin and a more compact interface between the two layers.
Sample A has a denser surface than sample B. This phenomenon can be explained by precursor nucleation, above the substrate, the clusters being then adsorbed on the surface.
As can be seen in Fig. 4a, the hydrogel beads, which were formed in the CaCl2 solution, had a denser surface composed of uniform nanofibers and a large amount of crosslinked alginate.
