Surface-charge-induced orientation of interfacial water suppresses heterogeneous ice nucleation on &amp;lt;i&amp;gt;α&amp;lt;/i&amp;gt;-alumina (0001)

Abdelmonem, Ahmed; Backus, Ellen H. G.; Hoffmann, Nadine; Sánchez, María Dolores Martín; Cyran, Jenée D.; Kiselev, Alexei; Bonn, Mischa

doi:10.5194/acp-17-7827-2017

Cited by 58 publications

(78 citation statements)

References 75 publications

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“…Lovering et al (2017) suggested the presence of a transient stackingdisordered ice at the interfaces during freezing. Abdelmonem et al (2018) have reported that the observed transient signals arise from a smooth transition between water and ice and do not necessarily indicate transient species. It was demonstrated that the transient change in the signal intensity results from an interference between different SFG peak parameters changing at different rates.…”

Section: Transient Freezing and Melting Peaksmentioning

confidence: 98%

“…Although this study was not aimed at discussing the transient freezing peak, the obtained data force us to reconsider this recently observed ambiguous phenomenon. The transient peak upon freezing was reported at pH 9.8 for the aqueoussolution-mica interface using SFG (sum-frequency generation) spectroscopy (Anim-Danso et al, 2016), for a neutral water-silica interface using SFG spectroscopy (Lovering et al, 2017), for a neutral water-mica and water-sapphire interface using SHG spectroscopy (Abdelmonem, 2017), and for a pH 9 aqueous-solution-sapphire interface using SFG spectroscopy (Abdelmonem et al, 2018). Anim-Danso et al (2016) supposed that the transient signal is due to progressive events occurring near the surface during the phase transition, without specifying a potential process.…”

Section: Transient Freezing and Melting Peaksmentioning

confidence: 99%

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Cloud history can change water–ice–surface interactions of oxide mineral aerosols: a case study on silica

et al. 2020

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Abstract. Mineral aerosol particles nucleate ice, and many insights have been obtained on water freezing as a function of mineral surface properties such as charge or morphology. Previous studies have mainly focused on pristine samples despite the fact that aerosol particles age under natural atmospheric conditions. For example, an aerosol-containing cloud droplet can go through freeze–melt or evaporation–condensation cycles that change the surface structure, the ionic strength, and pH. Variations in the surface properties of ice-nucleating particles in the atmosphere have been largely overlooked. Here, we use an environmental cell in conjunction with nonlinear spectroscopy (second-harmonic generation) to study the effect of freeze–melt processes on the aqueous chemistry at silica surfaces at low pH. We found that successive freeze–melt cycles disrupt the dissolution equilibrium, substantially changing the surface properties and giving rise to marked variations in the interfacial water structure and the ice nucleation ability of the surface. The degree of order of water molecules, next to the surface, at any temperature during cooling decreases and then increases again with sample aging. Along the aging process, the water ordering–cooling dependence and ice nucleation ability improve continuously.

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Section: Transient Freezing and Melting Peaksmentioning

confidence: 98%

Section: Transient Freezing and Melting Peaksmentioning

confidence: 99%

Cloud history can change water–ice–surface interactions of oxide mineral aerosols: a case study on silica

et al. 2020

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“…The SHG experiments were conducted using a femtosecond laser system (Solstice, Spectra Physics) with a fundamental beam of 800 nm wavelength, 3.5 mJ pulse energy, ∼ 80 fs pulse width, 1 kHz repetition rate, and a beam diameter of ∼ 2 mm at the interface. The supercooled SHG setup and the measuring cell are similar to those described in previous publications (Abdelmonem et al, 2015(Abdelmonem et al, , 2017. Compared to the setup described in Abdelmonem et al (2015), a single fundamental beam incident on the interface was used ( Fig.…”

Section: Materials and Setupmentioning

confidence: 99%

Direct molecular-level characterization of different heterogeneous freezing modes on mica – Part 1

Abdelmonem

2017

Atmos. Chem. Phys.

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Abstract. The mechanisms behind heterogeneous ice nucleation are of fundamental importance to the prediction of the occurrence and properties of many cloud types, which influence climate and precipitation. Aerosol particles act as cloud condensation and freezing nuclei. The surface-water interaction of an ice nucleation particle plays a major, not well explored, role in its ice nucleation ability. This paper presents a real-time molecular-level comparison of different freezing modes on the surface of an atmospherically relevant mineral surface (mica) under varying supersaturation conditions using second-harmonic generation spectroscopy. Two sub-deposition nucleation modes were identified (one-and two-stage freezing). The nonlinear signal at the water-mica interface was found to drop following the formation of a thin film on the surface regardless of (1) the formed phase (liquid or ice) and (2) the freezing path (one or two step), indicating similar molecular structuring. The results also revealed a transient phase of ice at water-mica interfaces during freezing, which has a lifetime of around 1 min. Such information will have a significant impact on climate change, weather modification, and the tracing of water in hydrosphere studies.

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“…They have been isolated from decaying leaf litter and can induce freezing at temperatures up to −2 • C (Schnell and Vali, 1972;Maki et al, 1974;Vali et al, 1976;Möhler et al, 2007). P. syringae are gramnegative bacteria that populate leaf surfaces and are able to cause frost injuries in plants (Lindow, 1983;Hirano and Upper, 2000;Akila et al, 2018). They were shown to owe their IN activity to a protein located on the outer cell membrane that templates ice through a sequence of amino acids providing an epitaxial fit to ice (Kajava and Lindow, 1993;Murray et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…IN activity is preserved when the cells are disrupted, though with a shift to lower freezing temperatures (Govindarajan and Lindow, 1988). At lower temperatures, other types of bacteria (including gram-positive ones) also proved to exhibit IN activity (Ponder et al, 2005;Mortazavi et al, 2008;Failor et al, 2017;Akila et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Protein aggregates nucleate ice: the example of apoferritin

et al. 2020

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Abstract. Biological material has gained increasing attention recently as a source of ice-nucleating particles that may account for cloud glaciation at moderate supercooling. While the ice-nucleation (IN) ability of some bacteria can be related to membrane-bound proteins with epitaxial fit to ice, little is known about the IN-active entities present in biological material in general. To elucidate the potential of proteins and viruses to contribute to the IN activity of biological material, we performed bulk freezing experiments with the newly developed drop freezing assay DRoplet Ice Nuclei Counter Zurich (DRINCZ), which allows the simultaneous cooling of 96 sample aliquots in a chilled ethanol bath. We performed a screening of common proteins, namely the iron storage protein ferritin and its iron-free counterpart apoferritin, the milk protein casein, the egg protein ovalbumin, two hydrophobins, and a yeast ice-binding protein, all of which revealed IN activity with active site densities > 0.1 mg−1 at −10 ∘C. The tobacco mosaic virus, a plant virus based on helically assembled proteins, also proved to be IN active with active site densities increasing from 100 mg−1 at −14 ∘C to 10 000 mg−1 at −20 ∘C. Among the screened proteins, the IN activity of horse spleen ferritin and apoferritin, which form cages of 24 co-assembled protein subunits, proved to be outstanding with active site densities > 10 mg−1 at −5 ∘C. Investigation of the pH dependence and heat resistance of the apoferritin sample confirmed the proteinaceous nature of its IN-active entities but excluded the correctly folded cage monomer as the IN-active species. A dilution series of apoferritin in water revealed two distinct freezing ranges, an upper one from −4 to −11 ∘C and a lower one from −11 to −21 ∘C. Dynamic light scattering measurements related the upper freezing range to ice-nucleating sites residing on aggregates and the lower freezing range to sites located on misfolded cage monomers or oligomers. The sites proved to persist during several freeze–thaw cycles performed with the same sample aliquots. Based on these results, IN activity seems to be a common feature of diverse proteins, irrespective of their function, but arising only rarely, most probably through defective folding or aggregation to structures that are IN active.

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Surface-charge-induced orientation of interfacial water suppresses heterogeneous ice nucleation on <i>α</i>-alumina (0001)

Cited by 58 publications

References 75 publications

Cloud history can change water–ice–surface interactions of oxide mineral aerosols: a case study on silica

Cloud history can change water–ice–surface interactions of oxide mineral aerosols: a case study on silica

Direct molecular-level characterization of different heterogeneous freezing modes on mica – Part 1

Protein aggregates nucleate ice: the example of apoferritin

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