  We theoretically study physical properties of one-dimensionally and regularly
placed solutes. The solute is rigid-body, has arrow-like shape, and changes its
direction up or down. If the solutes are immersed in continuum solvent, nothing
happens in the system. However, the property of the directions differs in
granular solvent (e.g., hard-sphere solvent). Depending on distance between the
nearest-neighbor solutes, the directional property periodically changes as
follows: "ferromagnetic-like" \leftrightarrow "random" \leftrightarrow
"antiferromagnetic-like". Furthermore, the directional property decays into
"random" as the distance increases. Studying a newly created nano-system
theoretically, it is able to discover a new or interesting property hiding in
nano-material world. We believe that such an approach gives physics research a
new direction and contributes to nanotechnology.
