FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2901812834> ?p ?o ?g. }

• W2901812834 endingPage "6058" @default.
• W2901812834 startingPage "6035" @default.
• W2901812834 abstract "Abstract. Divergent ice nucleation (IN) efficiencies of quartz, an important component of atmospheric mineral dust, have been reported in previous studies. We show here that quartz particles obtain their IN activity from milling and that quartz aged in water loses most of its IN efficiency relative to freshly milled quartz. Since most studies so far reported IN activities of commercial quartz dusts that were milled already by the manufacturer, IN active samples prevailed. Also, the quartz surface – much in contrast to that of feldspars – is not prone to ammonia-induced IN enhancement. In detail we investigate the influence of solutes on the IN efficiency of various silica (SiO2) particles (crystalline and amorphous) with special focus on quartz. We performed immersion freezing experiments and relate the observed variability in IN activity to the influence of milling, the aging time and to the exposure conditions since milling. Immersion freezing with silica particles suspended in pure water or aqueous solutions of NH3, (NH4)2SO4, NH4HSO4, Na2SO4 and NaOH, with solute concentrations corresponding to water activities aw=0.9–1.0, were investigated in emulsified droplets by means of differential scanning calorimetry (DSC) and analyzed in terms of the onset temperature of the heterogeneous freezing signal Thet and the heterogeneously frozen water volume fraction Fhet. Quartz particles, which originate from milling coarse samples, show a strong heterogeneous freezing peak in pure water with Thet equal to 247–251 K. This IN activity disappears almost completely after aging for 7 months in pure water in a glass vial. During this time quartz slowly grew by incorporating silicic acid leached from the glass vial. Conversely, the synthesized amorphous silica samples show no discernable heterogeneous freezing signal unless they were milled. This implies that defects provide IN activity to silica surfaces, whereas the IN activity of a natural quartz surface is negligible, when it grew under near-equilibrium conditions. For suspensions containing milled quartz and the solutes (NH4)2SO4, NH4HSO4 or Na2SO4, Thet approximately follows ThetΔawhet(aw), the heterogeneous freezing onset temperatures that obey Δawhet criterion, i.e., ThetΔawhet(aw)=Tmelt(aw+Δawhet) with Δawhet being a constant offset with respect to the ice melting point curve, similar to homogeneous IN. This water-activity-based description is expected to hold when the mineral surface is not altered by the presence of the solutes. On the other hand, we observe a slight enhancement in Fhet in the presence of these solutes, implying that the compliance with the Δawhet criterion does not necessarily imply constant Fhet. In contrast to the sulfates, dilute solutions of NH3 or NaOH (molality ≥5×10-4 mol kg−1) reveal Thet by 3–8 K lower than ThetΔawhet(aw), indicating a significant impact on the mineral surface. The lowering of Thet of quartz suspended in dilute NH3 solutions is opposite to the distinct increase in Thet that we found in emulsion freezing experiments with aluminosilicates, namely feldspars, kaolinite, gibbsite and micas. We ascribe this decrease in IN activity to the increased dissolution of quartz under alkaline conditions. The defects that constitute the active sites appear to be more susceptible to dissolution and therefore disappear first on a dissolving surface." @default.
• W2901812834 created "2018-11-29" @default.
• W2901812834 creator A5084951767 @default.
• W2901812834 creator A5088730128 @default.
• W2901812834 creator A5089630407 @default.
• W2901812834 date "2019-05-08" @default.
• W2901812834 modified "2023-10-15" @default.
• W2901812834 title "Ice nucleation activity of silicates and aluminosilicates in pure water and aqueous solutions – Part 2: Quartz and amorphous silica" @default.
• W2901812834 cites W1526392131 @default.
• W2901812834 cites W1587101236 @default.
• W2901812834 cites W1616398204 @default.
• W2901812834 cites W1644074212 @default.
• W2901812834 cites W1890193808 @default.
• W2901812834 cites W1901194973 @default.
• W2901812834 cites W1955431138 @default.
• W2901812834 cites W1964121487 @default.
• W2901812834 cites W1970378186 @default.
• W2901812834 cites W1972128522 @default.
• W2901812834 cites W1972755861 @default.
• W2901812834 cites W1983277381 @default.
• W2901812834 cites W1986758144 @default.
• W2901812834 cites W1987740074 @default.
• W2901812834 cites W1988186603 @default.
• W2901812834 cites W1992981130 @default.
• W2901812834 cites W1993436181 @default.
• W2901812834 cites W1993928836 @default.
• W2901812834 cites W1996597296 @default.
• W2901812834 cites W1997322851 @default.
• W2901812834 cites W2003609307 @default.
• W2901812834 cites W2004736225 @default.
• W2901812834 cites W2005341126 @default.
• W2901812834 cites W2008348801 @default.
• W2901812834 cites W2010697548 @default.
• W2901812834 cites W2011290612 @default.
• W2901812834 cites W2013107255 @default.
• W2901812834 cites W2013141948 @default.
• W2901812834 cites W2015914816 @default.
• W2901812834 cites W2016809654 @default.
• W2901812834 cites W2017434004 @default.
• W2901812834 cites W2018024014 @default.
• W2901812834 cites W2018919936 @default.
• W2901812834 cites W2019999694 @default.
• W2901812834 cites W2022321851 @default.
• W2901812834 cites W2023418992 @default.
• W2901812834 cites W2024646389 @default.
• W2901812834 cites W2029243935 @default.
• W2901812834 cites W2030048712 @default.
• W2901812834 cites W2030347013 @default.
• W2901812834 cites W2033745265 @default.
• W2901812834 cites W2041848764 @default.
• W2901812834 cites W2045064685 @default.
• W2901812834 cites W2045465826 @default.
• W2901812834 cites W2047715735 @default.
• W2901812834 cites W2048094265 @default.
• W2901812834 cites W2050401506 @default.
• W2901812834 cites W2050683683 @default.
• W2901812834 cites W2051342800 @default.
• W2901812834 cites W2052072594 @default.
• W2901812834 cites W2054514958 @default.
• W2901812834 cites W2055168595 @default.
• W2901812834 cites W2058907940 @default.
• W2901812834 cites W2063091172 @default.
• W2901812834 cites W2065731750 @default.
• W2901812834 cites W2067826422 @default.
• W2901812834 cites W2069428893 @default.
• W2901812834 cites W2070914672 @default.
• W2901812834 cites W2071385349 @default.
• W2901812834 cites W2072653673 @default.
• W2901812834 cites W2075484023 @default.
• W2901812834 cites W2076666270 @default.
• W2901812834 cites W2076826263 @default.
• W2901812834 cites W2078773517 @default.
• W2901812834 cites W2079201446 @default.
• W2901812834 cites W2091655907 @default.
• W2901812834 cites W2094408786 @default.
• W2901812834 cites W2100365896 @default.
• W2901812834 cites W2101425695 @default.
• W2901812834 cites W2102319010 @default.
• W2901812834 cites W2105286019 @default.
• W2901812834 cites W2105779189 @default.
• W2901812834 cites W2105930044 @default.
• W2901812834 cites W2108659478 @default.
• W2901812834 cites W2109631880 @default.
• W2901812834 cites W2116454668 @default.
• W2901812834 cites W2118328181 @default.
• W2901812834 cites W2119134235 @default.
• W2901812834 cites W2119513116 @default.
• W2901812834 cites W2125740784 @default.
• W2901812834 cites W2125840831 @default.
• W2901812834 cites W2127193466 @default.
• W2901812834 cites W2128593685 @default.
• W2901812834 cites W2132281993 @default.
• W2901812834 cites W2136115619 @default.
• W2901812834 cites W2138881777 @default.
• W2901812834 cites W2141228044 @default.
• W2901812834 cites W2150711435 @default.
• W2901812834 cites W2151422015 @default.
• W2901812834 cites W2151725382 @default.

• next