Abstract
Dry Ionic Liquid (D-IL) never means some “water-free” ionic liquid but is a member of “Dry Matter (DM)”. DM is a collective name for powdery substances that are composed of micro droplets as an inner core phase and surrounding hydrophobic silica nano particles as the shell part. When the core part is water, it is called Dry Water (DW), which is the first member of DM, while D-IL is the newest one. Because of the much larger surface area of DM compared with that of the inner phase in bulk state, this novel substances are expected to show excellent performance for any mass transfer through the gas-liquid interface. In the present study, we investigated CO2 absorption by some D-ILs and a DM containing a polyamine in terms of the speed to the equilibrium and a mol-based absorption efficiency. Compared with the respective bulk systems, the D-IL and DM systems proved to be accelerated by ca.50 times without impairing the absorption efficiency.
Highlights
Dry water (DW) has been known since the mid-1960 s when a German patent reported its properties and manufacturing procedure with its name [1]
Dry Matter (DM) is a collective name for powdery substances that are composed of micro droplets as an inner core phase and surrounding hydrophobic silica nano particles as the shell part
Using the bulk liquid without added water, only a creamy or paste-like substance was obtained (Table 1). This failure in preparation of a powdery Dry Ionic Liquid (D-IL) may be ascribed to relatively low surface tension (γ) of the pertinent IL; γ of the IL is not available in literatures, γ of 1-ethyl-3-methylimidazolium acetate was reported to be ca.46 mN/m [23]
Summary
Dry water (DW) has been known since the mid-1960 s when a German patent reported its properties and manufacturing procedure with its name [1]. DW can be prepared by mixing water and hydrophobic fumed silica particles even in a home-use blending machine with a relatively high speed (typically >104 rpm) for several tens of seconds. The physicochemical properties of DW, has never been studied until two groups rediscovered DW; Binks and Murakami reported that the phase inversion of air-in-water type Pickering emulsion (foam) to water-in-air type one (DW) occurs by changing the particles’ hydrophilicity (hydrophobicity) and/or the volume ratio of water to air [3]. Preparation conditions for DW have been rather extensively studied so far; Pezron and her coworkers investigated in their series of papers [5]-[7] successful conditions for DW and concluded that balance of the mechanical energy input and the interaction energy of water and the solid particles at the interface is the most critical factor. When vigorously mixed, only strongly hydrophobic particles produce DW, while with less hydrophobic particles one must charge a weaker mechanical power into the system, otherwise only a paste-like substance will be obtained
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