![]() We found that the compact, ordered structure and abundant H-bonds of the MWF could be taken as the fundamental aspects of the ``hindering role'' of interfacial water for the hydrophobic assembly of nanographene. To explore the potential physical basis of the ``hindering role'' of self-organized interfacial water, the dynamical and structural properties as well as the status of hydrogen bonds (H-bonds) for interfacial water were investigated. By means of potential mean forces (PMFs) calculation, no energy barrier was observed during the sliding assembly of two graphene nanosheets, while the PMF profiles could be impacted by the contact forms of nanographene and the MWF within the interplate of two graphene nanosheets. The interfacial-organized monolayer water film ( MWF) induced ``two-step'' aggregation of nanographene in both stacking and sliding assembly pathways was reported for the first time. The interfacial-organized monolayer water film ( MWF) induced ``two-step'' aggregation of nanographene: both in stacking and sliding assembly pathwaysĪ computational investigation was carried out to understand the aggregation of nanoscale graphene with two typical pathways of stacking assembly and sliding assembly in water. Further work is being done on measurement of mixed phase mineral oil mist exposure. The problem of exposure under-estimation and inappropriate exposure sampling could be widespread. Over a quarter of UK mineral oil MWFs are formulated from mineral oils with viscosities less than 18 cSt (at 40 degrees C). However, sampling oils with viscosities less than 18 cSt will produce results which may significantly underestimate the true value. The main recommendation to arise from the work is that filter sampling can be performed on mineral oils with viscosities of 18 cSt (at 40 degrees C) or more with little evaporative losses from the filter. The losses from the MWF were mostly aliphatic hydrocarbons (C(10)-C(18)), but additives such as alkyl benzenes, esters, phenols and terpene odorants were also lost. Oils with viscosities greater that 18 cSt (at 40 degrees C) lost less than 5% of their weight, whereas those with viscosities less than 18 cSt gave losses up to 71%. The physical properties of MWF are governed by their composition and kinematic viscosity was found to be the most practical and easily available index of the potential for sample loss from the filter. min(-1) for periods up to 6 h before analysis. The sampling efficiency for a range of commercial mineral oil MWF were assessed by drawing clean air through spiked filters at 2 l. Past work was reviewed and experiments were done to select simple criteria which would enable such oils to be identified. This much has been known for some time but no simple method of identifying oils too volatile for customary filter sampling has been developed. Not all mineral oil metalworking fluids (MWFs) in common use form stable airborne mists which can be sampled quantitatively onto a filter. Simpson, A T Groves, J A Unwin, J Piney, M Mineral oil metal working fluids (MWFs)-development of practical criteria for mist sampling. ![]()
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