NM_001005 describes both particle size and zeta potential

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 <owl:Class rdf:about="&resource;NM_001005">
        <rdfs:label>particle size descriptor</rdfs:label>
        <rdfs:subClassOf rdf:resource="&resource;NM_000005"/>
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="&obo;IAO_0000136"/>
                <owl:someValuesFrom rdf:resource="&resource;NM_000001"/>
            </owl:Restriction>
        </rdfs:subClassOf>
    <description>Describes the particle size. The actual approach to describes it is
      undefined at this level.</description>
    </owl:Class>

    <owl:Class rdf:about="&resource;NM_001005">
        <rdfs:label>zetapotential descriptor</rdfs:label>
        <rdfs:subClassOf rdf:resource="&resource;NM_000006"/>
        <rdfs:subClassOf>
            <owl:Restriction>
                <owl:onProperty rdf:resource="&obo;IAO_0000136"/>
                <owl:someValuesFrom rdf:resource="&resource;NM_000001"/>
            </owl:Restriction>
        </rdfs:subClassOf>
    <description>Describes the zeta potential of the nanomaterial. The potential
      may be experimental, predicited, or originating from a read-across approach.</description>
    </owl:Class>