FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4246763118> ?p ?o ?g. }

• W4246763118 abstract "Abstract. Aluminosilicates (such as feldspars, clay minerals and micas) and quartz (a crystalline form of silica), constitute the majority of airborne mineral dust. Despite similarities in structures and surfaces they differ greatly in terms of their ice nucleation (IN) efficiency. Here, we show that determining factors for their IN activity include surface ion exchange, NH3 or NH4+ adsorption, as well as surface degradation due to the slow dissolution of the minerals. We performed immersion freezing experiments with the (Na-Ca)-feldspar andesine, the K-feldspar sanidine, the clay mineral kaolinite, the micas muscovite and biotite, and gibbsite (Al(OH)3, a mineral form of aluminum hydroxide) and compare their IN efficiencies with those of the previously characterized K-feldspar microcline and quartz. Samples were suspended in pure water as well as in aqueous solutions of NH3, (NH4)2SO4, NH4Cl and Na2SO4, with solute concentrations corresponding to water activities aw = 0.88–1.0. Using differential scanning calorimetry (DSC) on emulsified micron-sized droplets, we derived onset temperatures of heterogeneous (Thet) and homogeneous (Thom) freezing as well as heterogeneously frozen water volume fractions (Fhet). Suspensions in pure water of andesine, sanidine and kaolinite yield Thet = 242.8 K, 241.2 K and 240.3 K, respectively, while no discernable heterogeneous freezing signal is present in case of the micas or gibbsite (i.e. Thet &amp;approx; Thom &amp;approx; 237.0 K). The presence of NH3 and/or NH4+-salts as solutes has distinct effects on the IN efficiency of most of the investigated minerals. When feldspars and kaolinite are suspended in very dilute solutions of NH3 or NH4+-salts ( ~ 0.99), Thet shifts to higher temperatures (by 2.6–7.0 K compared to the pure water suspension). Even micas and gibbsite develop weak heterogeneous freezing activities in ammonia solutions. Conversely, suspensions containing Na2SO4 cause Thet of feldspars to clearly fall below the water-activity-based immersion freezing description (Δaw = const) even in very dilute Na2SO4 solutions, while Thet of kaolinite follows the Δaw = const curve. The water activity determines how the freezing temperature is affected by solute concentration alone, i.e. if the surface properties of the ice nucleating particles are not affected by the solute. Therefore, the complex behavior of the IN activities can only be explained in terms of solute-surface-specific processes. We suggest that the immediate exchange of the native cations (K+/Na+/Ca2+) with protons, when feldspars are immersed in water, is a prerequisite for their high IN efficiency. On the other hand, excess cations from dissolved alkali salts prevent surface protonation, thus explaining the decreased IN activity in such solutions. In kaolinite, the lack of exchangeable cations in the crystal lattice explains why the IN activity is insensitive to the presence of alkali salts (Δaw = const). We hypothesize that adsorption of NH3 and NH4+ on the feldspar surface rather than ion exchange is the main reason for the anomalous increased Thet in dilute solutions of NH3 or NH4+-salts. This is supported by the response of kaolinite to NH3 or NH4+, despite lacking exchangeable ions. Finally, on longer timescales (hours to days) the dissolution of the feldspars in water or solutions becomes an important process leading to depletion of Al and formation of an amorphous layer enriched in Si within less than an hour. This hampers the IN activity of andesine the most, followed by sanidine, then eventually microcline, the least soluble feldspar." @default.
• W4246763118 created "2022-05-12" @default.
• W4246763118 creator A5084951767 @default.
• W4246763118 creator A5088730128 @default.
• W4246763118 creator A5089630407 @default.
• W4246763118 date "2018-11-21" @default.
• W4246763118 modified "2023-10-18" @default.
• W4246763118 title "Ice nucleation activity of silicates and aluminosilicates in pure water and aqueous solutions. Part 3 – Aluminosilicates" @default.
• W4246763118 doi "https://doi.org/10.5194/acp-2018-1021" @default.
• W4246763118 hasPublicationYear "2018" @default.
• W4246763118 type Work @default.
• W4246763118 citedByCount "3" @default.
• W4246763118 countsByYear W42467631182018 @default.
• W4246763118 countsByYear W42467631182019 @default.
• W4246763118 crossrefType "posted-content" @default.
• W4246763118 hasAuthorship W4246763118A5084951767 @default.
• W4246763118 hasAuthorship W4246763118A5088730128 @default.
• W4246763118 hasAuthorship W4246763118A5089630407 @default.
• W4246763118 hasBestOaLocation W42467631181 @default.
• W4246763118 hasConcept C127313418 @default.
• W4246763118 hasConcept C147789679 @default.
• W4246763118 hasConcept C151730666 @default.
• W4246763118 hasConcept C161790260 @default.
• W4246763118 hasConcept C178790620 @default.
• W4246763118 hasConcept C184651966 @default.
• W4246763118 hasConcept C185592680 @default.
• W4246763118 hasConcept C199289684 @default.
• W4246763118 hasConcept C2776432453 @default.
• W4246763118 hasConcept C2776581184 @default.
• W4246763118 hasConcept C2777344214 @default.
• W4246763118 hasConcept C2777975867 @default.
• W4246763118 hasConcept C2778520076 @default.
• W4246763118 hasConcept C2779181077 @default.
• W4246763118 hasConcept C2779429093 @default.
• W4246763118 hasConcept C2779514672 @default.
• W4246763118 hasConcept C2779870107 @default.
• W4246763118 hasConcept C2779899878 @default.
• W4246763118 hasConcept C2780669261 @default.
• W4246763118 hasConcept C40212044 @default.
• W4246763118 hasConcept C55493867 @default.
• W4246763118 hasConcept C85704489 @default.
• W4246763118 hasConcept C88380143 @default.
• W4246763118 hasConceptScore W4246763118C127313418 @default.
• W4246763118 hasConceptScore W4246763118C147789679 @default.
• W4246763118 hasConceptScore W4246763118C151730666 @default.
• W4246763118 hasConceptScore W4246763118C161790260 @default.
• W4246763118 hasConceptScore W4246763118C178790620 @default.
• W4246763118 hasConceptScore W4246763118C184651966 @default.
• W4246763118 hasConceptScore W4246763118C185592680 @default.
• W4246763118 hasConceptScore W4246763118C199289684 @default.
• W4246763118 hasConceptScore W4246763118C2776432453 @default.
• W4246763118 hasConceptScore W4246763118C2776581184 @default.
• W4246763118 hasConceptScore W4246763118C2777344214 @default.
• W4246763118 hasConceptScore W4246763118C2777975867 @default.
• W4246763118 hasConceptScore W4246763118C2778520076 @default.
• W4246763118 hasConceptScore W4246763118C2779181077 @default.
• W4246763118 hasConceptScore W4246763118C2779429093 @default.
• W4246763118 hasConceptScore W4246763118C2779514672 @default.
• W4246763118 hasConceptScore W4246763118C2779870107 @default.
• W4246763118 hasConceptScore W4246763118C2779899878 @default.
• W4246763118 hasConceptScore W4246763118C2780669261 @default.
• W4246763118 hasConceptScore W4246763118C40212044 @default.
• W4246763118 hasConceptScore W4246763118C55493867 @default.
• W4246763118 hasConceptScore W4246763118C85704489 @default.
• W4246763118 hasConceptScore W4246763118C88380143 @default.
• W4246763118 hasLocation W42467631181 @default.
• W4246763118 hasLocation W42467631182 @default.
• W4246763118 hasLocation W42467631183 @default.
• W4246763118 hasLocation W42467631184 @default.
• W4246763118 hasOpenAccess W4246763118 @default.
• W4246763118 hasPrimaryLocation W42467631181 @default.
• W4246763118 hasRelatedWork W1490204782 @default.
• W4246763118 hasRelatedWork W1971751349 @default.
• W4246763118 hasRelatedWork W2013885789 @default.
• W4246763118 hasRelatedWork W2062661188 @default.
• W4246763118 hasRelatedWork W2103829247 @default.
• W4246763118 hasRelatedWork W2125962021 @default.
• W4246763118 hasRelatedWork W2164448494 @default.
• W4246763118 hasRelatedWork W2242157752 @default.
• W4246763118 hasRelatedWork W2900493399 @default.
• W4246763118 hasRelatedWork W4246763118 @default.
• W4246763118 isParatext "false" @default.
• W4246763118 isRetracted "false" @default.
• W4246763118 workType "article" @default.