Freezing and glass transitions upon cooling and warming and ice/freeze-concentration-solution morphology of emulsified aqueous citric acid

Bogdan, Anatoli; Molina, Mario J.; Tenhu, Heikki

doi:10.1016/j.ejpb.2016.09.012

Cited by 15 publications

(18 citation statements)

References 34 publications

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“…Another peculiarity of amorphous OM concerns the potential change in particle morphology upon nucleation of ice from an aqueous organic solution droplet. As water crystallizes, a freeze-induced phase separation into pure ice and a freeze-concentrated solution can occur. ,− Hence, ice nucleation may not necessarily result in a pure ice crystal but an ice crystal with inclusions or one that is partially or fully coated by the freeze-concentrated solution. This can have implications for water vapor pressure, multiphase chemical kinetics when the frozen particles act as reactive substrates, and the particles’ radiative properties.…”

Section: Introductionmentioning

confidence: 99%

The Role of Organic Aerosol in Atmospheric Ice Nucleation: A Review

Knopf

Alpert

Wang

2018

ACS Earth Space Chem.

281

413

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Predicting the formation of ice in the atmosphere presents one of the great challenges in 14 physical sciences with important implications for the chemistry and composition of the Earth's atmos-15 phere, the hydrological cycle, and climate. Among atmospheric ice formation processes, heterogeneous 16 ice nucleation proceeds on aerosol particles ranging from a few nanometers to micrometers in size, 17 commonly referred to as ice nucleating particles (INPs). Research over the last two decades has demon-18 strated that organic matter (OM) is ubiquitous in the atmosphere, present as organic aerosol (OA) parti-19 cles or as coatings on other particle types. The physicochemical properties of OM make predicting how 20 OM can contribute to the INP population challenging. This review focuses on the role of OM in INPs, 21

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Section: Introductionmentioning

confidence: 99%

The Role of Organic Aerosol in Atmospheric Ice Nucleation: A Review

Knopf

Alpert

Wang

2018

ACS Earth Space Chem.

281

413

View full text Add to dashboard Cite

show abstract

“…For emulsion preparation we used an oil-surfactant matrix consisted of 80 wt % halocarbon 0.8 oil (Halocarbon Products Corp.) and 20 wt % lanolin (Sigma Aldrich). CA/H 2 O/oil-surfactant-matrix of 1/10 by volume were subjected to magnetic stirring at different speeds in order to obtain CA/H 2 O drops of different size distributions [1]. In our measurements, we used methodology based on a ´2-dimensionál´ solution strategy designed for the in-situ observation of FIPS and ice/FCS morphology by applying OC-M [2], [3].…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…Movie demonstrates (i) the resumed freezing of FCS 2 , (ii) ice melting and (iii) dissolution of crystalline CA (see also the research article entitled “Freezing and glass transitions upon cooling and warming and ice/freeze-concentration-solution morphology of emulsified aqueous citric acid” (A. Bogdan, M.J. Molina, H. Tenhu, 2016) [1]). .…”

Section: Supplementary Materialsmentioning

confidence: 99%

“…The visualization data (8 movies) presented in this article are related to the research article entitled “Freezing and glass transitions upon cooling and warming and ice/freeze-concentration-solution morphology of emulsified aqueous citric acid” (A. Bogdan, M.J. Molina, H. Tenhu, 2016) [1]. The movies recorded in-situ with optical cryo-miscroscopy (OC-M) demonstrate for the first time freezing processes that occur during the cooling and subsequent warming of emulsified micrometer-scaled aqueous citric acid (CA) drops.…”

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confidence: 99%

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Visualization data on the freezing process of micrometer-scaled aqueous citric acid drops

2017

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The visualization data (8 movies) presented in this article are related to the research article entitled “Freezing and glass transitions upon cooling and warming and ice/freeze-concentration-solution morphology of emulsified aqueous citric acid” (A. Bogdan, M.J. Molina, H. Tenhu, 2016) [1]. The movies recorded in-situ with optical cryo-miscroscopy (OC-M) demonstrate for the first time freezing processes that occur during the cooling and subsequent warming of emulsified micrometer-scaled aqueous citric acid (CA) drops. The movies are made publicly available to enable critical or extended analyzes.

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“…Emulsions are another interesting system to freeze, for several reasons. The first one is, of course, to better understand the freeze/thaw stability of emulsions, which are of interest in many chemistry, 32 pharmaceutical, 33 and food engineering [34][35][36] applications. The second motivation are freezing routes using emulsions, which can yield porous materials 37 or capsules.…”

Section: Freezing Emulsionsmentioning

confidence: 99%

A temperature-controlled stage for laser scanning confocal microscopy and case studies in materials science

2018

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If confocal microscopy is an ubiquitous tool in life science, its applications in chemistry and materials science are still, in comparison, very limited. Of particular interest in these domains is the use of confocal microscopy to investigate temperature-dependent phenomena such as self-assembly, diffusio- or thermophoresis, or crystal growth. Several hurdles must be solved to develop a temperature-controlled stage for laser scanning confocal microscopy, in particular regarding the influence of an elevated temperature gradient close to the microscope objective, which most people try very hard to avoid. Here we report the design of a temperature-controlled stage able to generate stable temperature gradients in both positive and negative temperature range and does not require use of liquid nitrogen. Our setup provides an excellent control of the temperature gradient, which can be coupled with a controlled displacement of the sample, making it useful in particular for a variety of solidification, chemistry, and interfacial problems. We illustrate the benefits of our setup with several case studies of interest in chemistry and materials science: the 3D real-time imaging of ice growth, the segregation of hard particles by growing crystals, the freezing behaviour of single emulsions, the self-shaping of oil droplets upon cooling, and the self-assembly of amphiphile molecules into helical structures. These results show how confocal microscopy coupled with a temperature-controlled stage that provides a controlled temperature gradient is a welcome addition to the toolkit of chemists and materials scientists.

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Freezing and glass transitions upon cooling and warming and ice/freeze-concentration-solution morphology of emulsified aqueous citric acid

Cited by 15 publications

References 34 publications

The Role of Organic Aerosol in Atmospheric Ice Nucleation: A Review

The Role of Organic Aerosol in Atmospheric Ice Nucleation: A Review

Visualization data on the freezing process of micrometer-scaled aqueous citric acid drops

A temperature-controlled stage for laser scanning confocal microscopy and case studies in materials science

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