1
|
Saak CM, Backus EHG. The Role of Sum-Frequency Generation Spectroscopy in Understanding On-Surface Reactions and Dynamics in Atmospheric Model-Systems. J Phys Chem Lett 2024; 15:4546-4559. [PMID: 38636165 PMCID: PMC11071071 DOI: 10.1021/acs.jpclett.4c00392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 04/09/2024] [Accepted: 04/10/2024] [Indexed: 04/20/2024]
Abstract
Surfaces, both water/air and solid/water, play an important role in mediating a multitude of processes central to atmospheric chemistry, particularly in the aerosol phase. However, the study of both static and dynamic properties of surfaces is highly challenging from an experimental standpoint, leading to a lack of molecular level information about the processes that take place at these systems and how they differ from bulk. One of the few techniques that has been able to capture ultrafast surface phenomena is time-resolved sum-frequency generation (SFG) spectroscopy. Since it is both surface-specific and chemically sensitive, the extension of this spectroscopic technique to the time domain makes it possible to study dynamic processes on the femtosecond time scale. In this Perspective, we will explore recent advances made in the field both in terms of studying energy dissipation as well as chemical reactions and the role the surface geometry plays in these processes.
Collapse
Affiliation(s)
- Clara-Magdalena Saak
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währingerstrasse 42, 1090 Vienna, Austria
| | - Ellen H. G. Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währingerstrasse 42, 1090 Vienna, Austria
| |
Collapse
|
2
|
van der Veen MA, Canossa S, Wahiduzzaman M, Nenert G, Frohlich D, Rega D, Reinsch H, Shupletsov L, Markey K, De Vos DE, Bonn M, Stock N, Maurin G, Backus EHG. Confined Water Cluster Formation in Water Harvesting by Metal-Organic Frameworks: CAU-10-H versus CAU-10-CH 3. Adv Mater 2024; 36:e2210050. [PMID: 36651201 DOI: 10.1002/adma.202210050] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/31/2022] [Indexed: 06/17/2023]
Abstract
Several metal-organic frameworks (MOFs) excel in harvesting water from the air or as heat pumps as they show a steep increase in water uptake at 10-30 % relative humidity (RH%). A precise understanding of which structural characteristics govern such behavior is lacking. Herein, CAU-10-H and CAU-10-CH3 are studied with H, CH3 corresponding to the functions grafted to the organic linker. CAU-10-H shows a steep water uptake ≈18 RH% of interest for water harvesting, yet the subtle replacement of H by CH3 in the organic linker drastically changes the water adsorption behavior to less steep water uptake at much higher humidity values. The materials' structural deformation and water ordering during adsorption with in situ sum-frequency generation, in situ X-ray diffraction, and molecular simulations are unraveled. In CAU-10-H, an energetically favorable water cluster is formed in the hydrophobic pore, tethered via H-bonds to the framework μOH groups, while for CAU-10-CH3, such a favorable cluster cannot form. By relating the findings to the features of water adsorption isotherms of a series of MOFs, it is concluded that favorable water adsorption occurs when sites of intermediate hydrophilicity are present in a hydrophobic structure, and the formation of energetically favorable water clusters is possible.
Collapse
Affiliation(s)
- Monique A van der Veen
- Catalysis Engineering, Department of Chemical Engineering, TU Delft, Delft, 2628, The Netherlands
| | - Stefano Canossa
- Catalysis Engineering, Department of Chemical Engineering, TU Delft, Delft, 2628, The Netherlands
| | | | - Gwilherm Nenert
- Malvern Panalytical B. V., Lelyweg 1, Almelo, 7602EA, The Netherlands
| | | | - Davide Rega
- Catalysis Engineering, Department of Chemical Engineering, TU Delft, Delft, 2628, The Netherlands
| | - Helge Reinsch
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24118, Kiel, Germany
| | - Leonid Shupletsov
- Catalysis Engineering, Department of Chemical Engineering, TU Delft, Delft, 2628, The Netherlands
| | - Karen Markey
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Dirk E De Vos
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Mischa Bonn
- Max-Planck Institute for Polymer Research, Achermannweg 10, 55128, Mainz, Germany
| | - Norbert Stock
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24118, Kiel, Germany
| | - Guillaume Maurin
- ICGM, University of Montpellier, CNRS, ENSCM, Montpellier, 34293, France
| | - Ellen H G Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Wahringerstrasse 42, Vienna, 1090, Austria
| |
Collapse
|
3
|
Backus EHG, Hosseinpour S, Ramanan C, Sun S, Schlegel SJ, Zelenka M, Jia X, Gebhard M, Devi A, Wang HI, Bonn M. Ultrafast Surface-Specific Spectroscopy of Water at a Photoexcited TiO 2 Model Water-Splitting Photocatalyst. Angew Chem Int Ed Engl 2024; 63:e202312123. [PMID: 38010868 DOI: 10.1002/anie.202312123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/31/2023] [Accepted: 11/24/2023] [Indexed: 11/29/2023]
Abstract
A critical step in photocatalytic water dissociation is the hole-mediated oxidation reaction. Molecular-level insights into the mechanism of this complex reaction under realistic conditions with high temporal resolution are highly desirable. Here, we use femtosecond time-resolved, surface-specific vibrational sum frequency generation spectroscopy to study the photo-induced reaction directly at the interface of the photocatalyst TiO2 in contact with liquid water at room temperature. Thanks to the inherent surface specificity of the spectroscopic method, we can follow the reaction of solely the interfacial water molecules directly at the interface at timescales on which the reaction takes place. Following the generation of holes at the surface immediately after photoexcitation of the catalyst with UV light, water dissociation occurs on a sub-20 ps timescale. The reaction mechanism is similar at pH 3 and 11. In both cases, we observe the conversion of H2 O into Ti-OH groups and the deprotonation of pre-existing Ti-OH groups. This study provides unique experimental insights into the early steps of the photo-induced dissociation processes at the photocatalyst-water interface, relevant to the design of improved photocatalysts.
Collapse
Affiliation(s)
- Ellen H G Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090, Vienna, Austria
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Saman Hosseinpour
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Current address: Institute of Particle Technology (LFG), Friedrich-Alexander-Universität-Erlangen-Nürnberg (FAU), Cauerstraße 4, 91058, Erlangen, Germany
| | - Charusheela Ramanan
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands
| | - Shumei Sun
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Simon J Schlegel
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Moritz Zelenka
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090, Vienna, Austria
| | - Xiaoyu Jia
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Maximilian Gebhard
- Inorganic Materials Chemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Anjana Devi
- Inorganic Materials Chemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Hai I Wang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Nanophotonics, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC, Utrecht, The Netherlands
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| |
Collapse
|
4
|
Saak CM, Dreier LB, Machel K, Bonn M, Backus EHG. Biological lipid hydration: distinct mechanisms of interfacial water alignment and charge screening for model lipid membranes. Faraday Discuss 2024; 249:317-333. [PMID: 37795538 DOI: 10.1039/d3fd00117b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Studying lipid monolayers as model biological membranes, we demonstrate that water molecules interfacing with different model membranes can display preferential orientation for two distinct reasons: due to charges on the membrane, and due to large dipole fields resulting from zwitterionic headgroups. This preferential water orientation caused by the charge or the dipolar field can be effectively neutralized to net-zero water orientation by introducing monolayer counter-charges (i.e. lipids with oppositely charged headgroups). Following the Gouy-Chapman model, the effect of monolayer surface charge on water orientation is furthermore strongly dependent on the electrolyte concentration and thus on the counterions in solution. In contrast, the effect of ions in the subphase on the dipolar alignment of water is zero. As a result, the capability of monolayer counter-charges to null the effect of dipolar orientation is strongly electrolyte-dependent. Notably, the different effects are additive for mixed charged/zwitterionic lipid systems occurring in nature. Specifically, for an E. coli lipid membrane extract consisting of both zwitterionic and negatively charged lipids, the water orientation can be explained by the sum of the constituents. Our results can be quantitatively reproduced using Gouy-Chapman theory, revealing the relatively straightforward electrostatic effects on the hydration of complex membrane interfaces.
Collapse
Affiliation(s)
- Clara-Magdalena Saak
- Faculty of Chemistry, Institute of Physical Chemistry, University of Vienna, Währingerstrasse 42, 1090, Vienna, Austria.
| | - Lisa B Dreier
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Graduate School of Materials Science in Mainz, Staudingerweg 9, 55128, Mainz, Germany
| | - Kevin Machel
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Ellen H G Backus
- Faculty of Chemistry, Institute of Physical Chemistry, University of Vienna, Währingerstrasse 42, 1090, Vienna, Austria.
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| |
Collapse
|
5
|
Advincula XR, Backus EHG, Bonn M, Cox SJ, Diebold U, Fellows A, Finney AR, Goel G, Hedley J, Jiang Y, Jin D, Kapil V, Kavokine N, Klein J, Laage D, Mohandas N, Morgenstern K, Mukherjee T, Olvera de la Cruz M, Orlikowska-Rzeznik H, Perkin S, Piaggi PM, Rodellar CG, Ryan P, Sayer T, Seyffertitz M, Shepelenko M, Sosso GC, Thämer M, Vilangottunjalil A, Walker-Gibbons R, Wang Y, Willard AP, Zhang P. Electrified/charged aqueous interfaces: general discussion. Faraday Discuss 2024; 249:381-407. [PMID: 38170868 DOI: 10.1039/d3fd90065g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
|
6
|
Advincula XR, Backus EHG, Bartels-Rausch T, Benaglia S, Ben Ari G, Blow KE, Bonn M, Bui AT, Cox SJ, Della Pia F, Diebold U, Finney AR, Franceschi G, Fumagalli L, Goel G, Hayton JA, Holdship C, Jiang Y, Jin D, Kapil V, Kavokine N, Koga K, Laage D, Lahav M, Miao S, Michaelides A, Mohandas N, Morgenstern K, Mukherjee T, Nagata Y, Olvera de la Cruz M, Pan D, Piaggi PM, Rempe SLB, Ryan P, Salzmann CG, Sayer T, Saykally RJ, Shepelenko M, Sosso GC, Whale TF, White JJ, Willard AP, Zhang P. Ice interfaces: general discussion. Faraday Discuss 2024; 249:133-161. [PMID: 38174608 DOI: 10.1039/d3fd90063k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
|
7
|
Backus EHG, Ben Ari G, Benaglia S, Bonn M, Bui AT, Cox SJ, Della Pia F, Fraxedas J, Goel G, Jiang Y, Jin D, Koga K, Laage D, Miao S, Michaelides A, Morgenstern K, Mukherjee T, Nagata Y, Naito H, Nir O, Olvera de la Cruz M, Orlikowska-Rzeznik H, Pan D, Rempe SLB, Salzmann CG, Taira A, Vilangottunjalil A, Wang S, Willard AP, Yao Y, Yu J. Soft matter-water interface: general discussion. Faraday Discuss 2024; 249:485-520. [PMID: 38193511 DOI: 10.1039/d3fd90066e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
|
8
|
Buessler M, Maruyama S, Zelenka M, Onishi H, Backus EHG. Unravelling the interfacial water structure at the photocatalyst strontium titanate by sum frequency generation spectroscopy. Phys Chem Chem Phys 2023; 25:31471-31480. [PMID: 37962476 PMCID: PMC10664186 DOI: 10.1039/d3cp03829g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023]
Abstract
The direct conversion of solar energy to hydrogen is considered as a possible method to produce carbon neutral hydrogen fuel. The mechanism of photocatalytic water splitting involves the chemical breakdown of water and re-assembly into hydrogen and oxygen at the interface of a photocatalyst. The selection rules of a suitable material are well established, but the fundamental understanding of the mechanisms, occurring at the interface between the catalyst and the water, remains missing. Using surface specific sum frequency generation spectroscopy, we present here characterisation of the interface between water and the photocatalyst strontium titanate (SrTiO3). We monitor the OH-stretching vibrations present at the interface. Their variations of intensities and frequencies as functions of isotopic dilution, pH and salt concentration provide information about the nature of the hydrogen bonding environment. We observe the presence of water molecules that flip their orientation at pH 5 indicating the point of zero charge of the SrTiO3 layer. These water molecules are oriented with their hydrogen away from the surface when the pH of the solutions is below 5 and pointing towards the surface when the pH is higher than 5. Besides, water molecules donating a H-bond to probably surface TiOH groups are observed at all pH.
Collapse
Affiliation(s)
- Martin Buessler
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria.
- University of Vienna, Vienna Doctoral School in Chemistry (DoSChem), Währinger Straße 42, 1090 Vienna, Austria
| | - Shingo Maruyama
- Department of Applied Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Moritz Zelenka
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria.
- University of Vienna, Vienna Doctoral School in Chemistry (DoSChem), Währinger Straße 42, 1090 Vienna, Austria
| | - Hiroshi Onishi
- Department of Chemistry, School of Science, Kobe University, Rokko-dai, Nada, Kobe, Japan
- Division of Advanced Molecular Science, Institute for Molecular Science, Myodaiji, Okazaki, Japan
| | - Ellen H G Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria.
- University of Vienna, Vienna Doctoral School in Chemistry (DoSChem), Währinger Straße 42, 1090 Vienna, Austria
| |
Collapse
|
9
|
Naghilou A, Peter K, Millesi F, Stadlmayr S, Wolf S, Rad A, Semmler L, Supper P, Ploszczanski L, Liu J, Burghammer M, Riekel C, Bismarck A, Backus EHG, Lichtenegger H, Radtke C. Insights into the material properties of dragline spider silk affecting Schwann cell migration. Int J Biol Macromol 2023:125398. [PMID: 37330085 DOI: 10.1016/j.ijbiomac.2023.125398] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 06/09/2023] [Accepted: 06/13/2023] [Indexed: 06/19/2023]
Abstract
Dragline silk of Trichonephila spiders has attracted attention in various applications. One of the most fascinating uses of dragline silk is in nerve regeneration as a luminal filling for nerve guidance conduits. In fact, conduits filled with spider silk can measure up to autologous nerve transplantation, but the reasons behind the success of silk fibers are not yet understood. In this study dragline fibers of Trichonephila edulis were sterilized with ethanol, UV radiation, and autoclaving and the resulting material properties were characterized with regard to the silk's suitability for nerve regeneration. Rat Schwann cells (rSCs) were seeded on these silks in vitro and their migration and proliferation were investigated as an indication for the fiber's ability to support the growth of nerves. It was found that rSCs migrate faster on ethanol treated fibers. To elucidate the reasons behind this behavior, the fiber's morphology, surface chemistry, secondary protein structure, crystallinity, and mechanical properties were studied. The results demonstrate that the synergy of dragline silk's stiffness and its composition has a crucial effect on the migration of rSCs. These findings pave the way towards understanding the response of SCs to silk fibers as well as the targeted production of synthetic alternatives for regenerative medicine applications.
Collapse
Affiliation(s)
- Aida Naghilou
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria.
| | - Karolina Peter
- University of Natural Resources and Life Sciences, Department of Material Sciences and Process Engineering, Institute of Physics and Materials Science, Peter-Jordan-Strasse 82, 1190 Vienna, Austria
| | - Flavia Millesi
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Sarah Stadlmayr
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Sonja Wolf
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Anda Rad
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Lorenz Semmler
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Paul Supper
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Leon Ploszczanski
- University of Natural Resources and Life Sciences, Department of Material Sciences and Process Engineering, Institute of Physics and Materials Science, Peter-Jordan-Strasse 82, 1190 Vienna, Austria
| | - Jiliang Liu
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Manfred Burghammer
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Christian Riekel
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Alexander Bismarck
- University of Vienna, Faculty of Chemistry, Institute of Materials Chemistry & Research, Währingerstraße 42, 1090 Vienna, Austria
| | - Ellen H G Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währingerstraße 42, 1090 Vienna, Austria
| | - Helga Lichtenegger
- University of Natural Resources and Life Sciences, Department of Material Sciences and Process Engineering, Institute of Physics and Materials Science, Peter-Jordan-Strasse 82, 1190 Vienna, Austria
| | - Christine Radtke
- Department of Plastic, Reconstructive and Aesthetic Surgery, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria; Austrian Cluster for Tissue Regeneration, Vienna, Austria
| |
Collapse
|
10
|
Ober P, Hunger J, Kolbinger SH, Backus EHG, Bonn M. Ion Adsorption and Desorption at the CaF 2 -Water Interface Probed by Flow Experiments and Vibrational Spectroscopy. Angew Chem Int Ed Engl 2022; 61:e202207017. [PMID: 36006393 PMCID: PMC9828343 DOI: 10.1002/anie.202207017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Indexed: 01/12/2023]
Abstract
The dissolution of minerals in contact with water plays a crucial role in geochemistry. However, obtaining molecular insight into interfacial chemistry is challenging. Dissolution typically involves the release of ions from the surface, giving rise to a charged mineral surface. This charge affects the interfacial water arrangement, which can be investigated by surface-specific vibrational Sum Frequency Generation (v-SFG) spectroscopy. For the fluorite-water interface, recent spectroscopic studies concluded that fluoride adsorption/desorption determines the surface charge, which contrasts zeta potential measurements assigning this role to the calcium ion. By combining v-SFG spectroscopy and flow experiments with systematically suppressed dissolution, we uncover the interplay of dominant fluoride and weak calcium adsorption/desorption, resolving the controversy in the literature. We infer the calcium contribution to be orders of magnitude smaller, emphasizing the sensitivity of our approach.
Collapse
Affiliation(s)
- Patrick Ober
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Johannes Hunger
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Sophia H. Kolbinger
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Ellen H. G. Backus
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany,University of ViennaFaculty of ChemistryInstitute of Physical ChemistryWaehringer Strasse 421090ViennaAustria
| | - Mischa Bonn
- Department of Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| |
Collapse
|
11
|
Hunger J, Schaefer J, Ober P, Seki T, Wang Y, Prädel L, Nagata Y, Bonn M, Bonthuis DJ, Backus EHG. Nature of Cations Critically Affects Water at the Negatively Charged Silica Interface. J Am Chem Soc 2022; 144:19726-19738. [PMID: 36273333 PMCID: PMC9634801 DOI: 10.1021/jacs.2c02777] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Understanding the collective behavior of ions at charged
surfaces
is of paramount importance for geological and electrochemical processes.
Ions screen the surface charge, and interfacial fields break the centro-symmetry
near the surface, which can be probed using second-order nonlinear
spectroscopies. The effect of electrolyte concentration on the nonlinear
optical response has been semi-quantitatively explained by mean-field
models based on the Poisson–Boltzmann equation. Yet, to explain
previously reported ion-specific effects on the spectroscopic response,
drastic ion-specific changes in the interfacial properties, including
surface acidities and dielectric permittivities, or strong ion adsorption/desorption
had to be invoked. Here, we use sum-frequency generation (SFG) spectroscopy
to probe the symmetry-breaking of water molecules at a charged silica
surface in contact with alkaline metal chloride solutions (LiCl, NaCl,
KCl, and CsCl) at various concentrations. We find that the water response
varies with the cation: the SFG response is markedly enhanced for
LiCl compared to CsCl. We show that within mean-field models, neither
specific ion–surface interactions nor a reduced dielectric
constant of water near the interface can account for the variation
of spectral intensities with cation nature. Molecular dynamics simulations
confirm that the decay of the electrochemical potential only weakly
depends on the salt type. Instead, the effect of different salts on
the optical response is indirect, through the reorganization of the
interfacial water: the salt-type-dependent alignment of water directly
at the interface can explain the observations.
Collapse
Affiliation(s)
- Johannes Hunger
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Jan Schaefer
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Patrick Ober
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Takakazu Seki
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Yongkang Wang
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Leon Prädel
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Yuki Nagata
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Mischa Bonn
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
| | - Douwe Jan Bonthuis
- Institute of Theoretical and Computational Physics, Graz University of Technology, Petersgasse16/II, 8010Graz, Austria
| | - Ellen H. G. Backus
- Department for Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128Mainz, Germany
- Faculty of Chemistry, Institute of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090Vienna, Austria
| |
Collapse
|
12
|
Lesnicki D, Wank V, Cyran JD, Backus EHG, Sulpizi M. Lower degree of dissociation of pyruvic acid at water surfaces than in bulk. Phys Chem Chem Phys 2022; 24:13510-13513. [PMID: 35640627 DOI: 10.1039/d2cp01293f] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Understanding the acid/base behavior of environmentally relevant organic acids is of key relevance for accurate climate modelling. Here we investigate the effect of pH on the (de)protonation state of pyruvic acid at the air-water interface and in bulk by using the analytical techniques surface-specific vibrational sum frequency generation and attenuated total reflection spectroscopy. To provide a molecular interpretation of the observed behavior, simulations are carried out using a free energy perturbation approach in combination with electronic structure-based molecular dynamics. In both the experimental and theoretical results we observe that the protonated form of pyruvic acid is preferred at the air-water interface. The increased proton affinity is the result of the specific microsolvation at the interface.
Collapse
Affiliation(s)
- Dominika Lesnicki
- Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55099 Mainz, Germany.
| | - Veronika Wank
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria. .,University of Vienna, Vienna Doctoral School in Chemistry (DoSChem), Währinger Straße 42, 1090 Vienna, Austria
| | - Jenée D Cyran
- Department of Chemistry and Biochemistry, Baylor University, 76706 Waco, Texas, USA
| | - Ellen H G Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria. .,University of Vienna, Vienna Doctoral School in Chemistry (DoSChem), Währinger Straße 42, 1090 Vienna, Austria
| | - Marialore Sulpizi
- Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55099 Mainz, Germany. .,Department of Physics, Ruhr Universität Bochum, 44780 Bochum, Germany
| |
Collapse
|
13
|
Sosso GC, Sudera P, Backes AT, Whale TF, Fröhlich-Nowoisky J, Bonn M, Michaelides A, Backus EHG. The role of structural order in heterogeneous ice nucleation. Chem Sci 2022; 13:5014-5026. [PMID: 35655890 PMCID: PMC9067566 DOI: 10.1039/d1sc06338c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 04/07/2022] [Indexed: 01/10/2023] Open
Abstract
The freezing of water into ice is a key process that is still not fully understood. It generally requires an impurity of some description to initiate the heterogeneous nucleation of the ice crystals. The molecular structure, as well as the extent of structural order within the impurity in question, both play an essential role in determining its effectiveness. However, disentangling these two contributions is a challenge for both experiments and simulations. In this work, we have systematically investigated the ice-nucleating ability of the very same compound, cholesterol, from the crystalline (and thus ordered) form to disordered self-assembled monolayers. Leveraging a combination of experiments and simulations, we identify a “sweet spot” in terms of the surface coverage of the monolayers, whereby cholesterol maximises its ability to nucleate ice (which remains inferior to that of crystalline cholesterol) by enhancing the structural order of the interfacial water molecules. These findings have practical implications for the rational design of synthetic ice-nucleating agents. The freezing of water into ice is still not fully understood. Here, we investigate the role of structural disorder within the biologically relevant impurities that facilitate this fundamental phase transition.![]()
Collapse
Affiliation(s)
- Gabriele C Sosso
- Department of Chemistry, University of Warwick Gibbet Hill Road Coventry CV4 7AL UK
| | - Prerna Sudera
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Anna T Backes
- Max Planck Institute for Chemistry Hahn-Meitner-Weg 1 55128 Mainz Germany
| | - Thomas F Whale
- Department of Chemistry, University of Warwick Gibbet Hill Road Coventry CV4 7AL UK
| | | | - Mischa Bonn
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
| | - Angelos Michaelides
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany.,Department of Physical Chemistry, University of Vienna Währingerstrasse 42 1090 Wien Austria
| |
Collapse
|
14
|
Li X, Encheva M, Butt HJ, Backus EHG, Berger R. Adaptation and Recovery of A Styrene-Acrylic Acid Copolymer Surface to Water. Macromol Rapid Commun 2022; 43:e2100733. [PMID: 35338785 DOI: 10.1002/marc.202100733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 02/09/2022] [Indexed: 11/06/2022]
Abstract
Drops sliding down an adaptive surface lead to changes of the dynamic contact angles. Two adaptation processes play a role: (i) the adaptation of the surface upon bringing it into contact to the drop (wetting) and (ii) the adaptation of the surface after the drop passed (dewetting). In order to study both processes, we investigated samples made from random styrene (PS)/acrylic acid (PAA) copolymers, which are exposed to water. Sum-frequency generation spectroscopy (SFG) and tilted-plate measurements indicate that during wetting, the PS segments displace from the interface, while PAA segments are enriched. This structural adaptation of the PS/PAA random copolymer to water remains after dewetting. Annealing the adapted polymer induces reorientation of the PS segments to the surface. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Xiaomei Li
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, 55128, Germany
| | - Mirela Encheva
- Department of Physical Chemistry, University of Vienna, Währinger Straße 42, Vienna, 1090, Austria
| | - Hans-Jürgen Butt
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, 55128, Germany
| | - Ellen H G Backus
- Department of Physical Chemistry, University of Vienna, Währinger Straße 42, Vienna, 1090, Austria
| | - Rüdiger Berger
- Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, 55128, Germany
| |
Collapse
|
15
|
Vaillard AS, El Haitami A, Dreier LB, Fontaine P, Cousin F, Gutfreund P, Goldmann M, Backus EHG, Cantin S. Vertically Heterogeneous 2D Semi-Interpenetrating Networks Based on Cellulose Acetate and Cross-Linked Polybutadiene. Langmuir 2022; 38:2538-2549. [PMID: 35171621 DOI: 10.1021/acs.langmuir.1c03084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This work reports the feasibility of polybutadiene (PB) cross-linking under UV irradiation in the presence of a linear polymer, cellulose acetate (CA), to form semi-interpenetrating polymer networks at the air-water interface. The thermodynamic properties and the morphology of two-dimensional (2D) CA/PB blends are investigated after UV irradiation and for a wide range of CA volume fractions. A contraction of the mixed Langmuir films is observed independent of the composition, in agreement with that recorded for the individual PB monolayer after cross-linking. The PB network formation is demonstrated by in situ sum-frequency generation spectroscopy on the equivolumic CA/PB mixed film. From Brewster angle microscopy observations, the PB network synthesis does not induce any morphology change at the mesoscopic scale, and all of the mixed films remain homogeneous laterally. In situ neutron reflectometry is used to probe the effect of PB cross-linking on the vertical structure of CA/PB mixed films. For all studied compositions, significant thickening of the films is evidenced, consistent with their contraction ratio. This thickening is accompanied by a partial expulsion of the PB toward the film-air interface, which is attributed to the hydrophobic character of the PB. This phenomenon is stronger for films rich in PB. In particular, the structure of the PB-rich film undergoes a transition from vertically homogeneous to inhomogeneous along the depth. 2D semi-interpenetrating polymer networks can thus be synthesized at the air-water interface with a morphology that is strongly influenced by the polymer-polymer and polymer-environment interactions.
Collapse
Affiliation(s)
| | | | - Lisa B Dreier
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Philippe Fontaine
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
| | - Fabrice Cousin
- Laboratoire Léon Brillouin, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | | | - Michel Goldmann
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif sur Yvette Cedex, France
- Institut des NanoSciences de Paris, Sorbonne Université, 75252 Paris Cedex 05, France
- Faculté des Sciences Fondamentales et Biomédicales, Université de Paris, 75006 Paris, France
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria
| | | |
Collapse
|
16
|
Lukas M, Backus EHG, Bonn M, Grechko M. Passively Stabilized Phase-Resolved Collinear SFG Spectroscopy Using a Displaced Sagnac Interferometer. J Phys Chem A 2022; 126:951-956. [PMID: 35113564 DOI: 10.1021/acs.jpca.1c10155] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Sum-frequency generation (SFG) vibrational spectroscopy is a powerful technique to study interfaces at the molecular level. Phase-resolved SFG (PR-SFG) spectroscopy provides direct information on interfacial molecules' orientation. However, its implementation is technologically demanding: it requires the generation of a local oscillator wave and control of its time delay with sub-fs accuracy. Commonly used noncollinear PR-SFG provides this control naturally but requires very accurate sample height control. Collinear PR-SFG spectroscopy is less demanding regarding sample positioning, but tuning the local oscillator time delay with this beam geometry is challenging. Here, we develop a collinear PR-SFG setup using a displaced Sagnac interferometer. This scheme allows full, independent control of the time delay and intensity of the local oscillator and provides long-time phase stabilization (better than 5° over 12 h) for the measured signal. This approach substantially reduces the complexity of an experimental setup and combines the advantages of collinear and noncollinear PR-SFG techniques.
Collapse
Affiliation(s)
- Max Lukas
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Ellen H G Backus
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany.,Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Mischa Bonn
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Maksim Grechko
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| |
Collapse
|
17
|
Turetta N, Stoeckel MA, Furlan de Oliveira R, Devaux F, Greco A, Cendra C, Gullace S, Gicevičius M, Chattopadhyay B, Liu J, Schweicher G, Sirringhaus H, Salleo A, Bonn M, Backus EHG, Geerts YH, Samorì P. High-Performance Humidity Sensing in π-Conjugated Molecular Assemblies through the Engineering of Electron/Proton Transport and Device Interfaces. J Am Chem Soc 2022; 144:2546-2555. [DOI: 10.1021/jacs.1c10119] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Nicholas Turetta
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 Allée Gaspard Monge, F-67000 Strasbourg, France
| | - Marc-Antoine Stoeckel
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 Allée Gaspard Monge, F-67000 Strasbourg, France
| | - Rafael Furlan de Oliveira
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 Allée Gaspard Monge, F-67000 Strasbourg, France
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), 13083-970 Campinas, São Paulo, Brazil
| | - Félix Devaux
- Laboratoire de Chimie des Polymères Faculté des Sciences, Université Libre de Bruxelles (ULB), CP 206/1 Boulevard du Triomphe, 1050 Bruxelles, Belgium
| | - Alessandro Greco
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Camila Cendra
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | - Sara Gullace
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 Allée Gaspard Monge, F-67000 Strasbourg, France
| | - Mindaugas Gicevičius
- Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K
| | - Basab Chattopadhyay
- Laboratoire de Chimie des Polymères Faculté des Sciences, Université Libre de Bruxelles (ULB), CP 206/1 Boulevard du Triomphe, 1050 Bruxelles, Belgium
- Department of Physics, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, 7491 Trondheim, Norway
| | - Jie Liu
- Laboratoire de Chimie des Polymères Faculté des Sciences, Université Libre de Bruxelles (ULB), CP 206/1 Boulevard du Triomphe, 1050 Bruxelles, Belgium
| | - Guillaume Schweicher
- Laboratoire de Chimie des Polymères Faculté des Sciences, Université Libre de Bruxelles (ULB), CP 206/1 Boulevard du Triomphe, 1050 Bruxelles, Belgium
| | - Henning Sirringhaus
- Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K
| | - Alberto Salleo
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H. G. Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Yves H. Geerts
- Laboratoire de Chimie des Polymères Faculté des Sciences, Université Libre de Bruxelles (ULB), CP 206/1 Boulevard du Triomphe, 1050 Bruxelles, Belgium
- International Solvay Institutes of Physics and Chemistry, ULB, CP
231, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - Paolo Samorì
- Université de Strasbourg, CNRS, ISIS UMR 7006, 8 Allée Gaspard Monge, F-67000 Strasbourg, France
| |
Collapse
|
18
|
Vasileiadis T, Marchesi D’Alvise T, Saak CM, Pochylski M, Harvey S, Synatschke CV, Gapinski J, Fytas G, Backus EHG, Weil T, Graczykowski B. Fast Light-Driven Motion of Polydopamine Nanomembranes. Nano Lett 2022; 22:578-585. [PMID: 34904831 PMCID: PMC8796235 DOI: 10.1021/acs.nanolett.1c03165] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 11/15/2021] [Indexed: 06/12/2023]
Abstract
The actuation of micro- and nanostructures controlled by external stimuli remains one of the exciting challenges in nanotechnology due to the wealth of fundamental questions and potential applications in energy harvesting, robotics, sensing, biomedicine, and tunable metamaterials. Photoactuation utilizes the conversion of light into motion through reversible chemical and physical processes and enables remote and spatiotemporal control of the actuation. Here, we report a fast light-to-motion conversion in few-nanometer thick bare polydopamine (PDA) membranes stimulated by visible light. Light-induced heating of PDA leads to desorption of water molecules and contraction of membranes in less than 140 μs. Switching off the light leads to a spontaneous expansion in less than 20 ms due to heat dissipation and water adsorption. Our findings demonstrate that pristine PDA membranes are multiresponsive materials that can be harnessed as robust building blocks for soft, micro-, and nanoscale actuators stimulated by light, temperature, and moisture level.
Collapse
Affiliation(s)
- Thomas Vasileiadis
- Faculty
of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, 61-614 Poznan, Poland
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | | | - Clara-Magdalena Saak
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Mikolaj Pochylski
- Faculty
of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, 61-614 Poznan, Poland
| | - Sean Harvey
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | | | - Jacek Gapinski
- Faculty
of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, 61-614 Poznan, Poland
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H. G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Tanja Weil
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Bartlomiej Graczykowski
- Faculty
of Physics, Adam Mickiewicz University, Uniwersytetu Poznanskiego 2, 61-614 Poznan, Poland
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
19
|
Yu X, Seki T, Yu CC, Zhong K, Sun S, Okuno M, Backus EHG, Hunger J, Bonn M, Nagata Y. Interfacial Water Structure of Binary Liquid Mixtures Reflects Nonideal Behavior. J Phys Chem B 2021; 125:10639-10646. [PMID: 34503330 PMCID: PMC8474108 DOI: 10.1021/acs.jpcb.1c06001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 08/21/2021] [Indexed: 11/28/2022]
Abstract
The evaporation of molecules from water-organic solute binary mixtures is key for both atmospheric and industrial processes such as aerosol formation and distillation. Deviations from ideal evaporation energetics can be assigned to intermolecular interactions in solution, yet evaporation occurs from the interface, and the poorly understood interfacial, rather than the bulk, structure of binary mixtures affects evaporation kinetics. Here we determine the interfacial structure of nonideal binary mixtures of water with methanol, ethanol, and formic acid, by combining surface-specific vibrational spectroscopy with molecular dynamics simulations. We find that the free, dangling OH groups at the interfaces of these differently behaving nonideal mixtures are essentially indistinguishable. In contrast, the ordering of hydrogen-bonded interfacial water molecules differs substantially at these three interfaces. Specifically, the interfacial water molecules become more disordered (ordered) in mixtures with methanol and ethanol (formic acid), showing higher (lower) vapor pressure than that predicted by Raoult's law.
Collapse
Affiliation(s)
- Xiaoqing Yu
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Takakazu Seki
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Chun-Chieh Yu
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Kai Zhong
- University
of Groningen, Zernike Institute
for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Shumei Sun
- Department
of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, 100875 Beijing, China
| | - Masanari Okuno
- Department
of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, 153-8902 Tokyo, Japan
| | - Ellen H. G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Johannes Hunger
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Yuki Nagata
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
20
|
Bera B, Backus EHG, Carrier O, Bonn M, Shahidzadeh N, Bonn D. Antisurfactant (Autophobic) Behavior of Superspreader Surfactant Solutions. Langmuir 2021; 37:6243-6247. [PMID: 33983746 PMCID: PMC8280720 DOI: 10.1021/acs.langmuir.1c00475] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Surfactants are often added to water to increase the wetting of hydrophobic surfaces. We previously showed that most surfactant solutions behave identically to simple liquids with the same surface tension, indicating that the surfactants do not change the wettability of the solid surface itself. Here, we show that the superspreading surfactant Silwet results in a systematically higher contact angle on a hydrophobic surface than other surfactant solutions of comparable liquid-vapor surface tension. We also experimentally observe this "antisurfactant" behavior for CTAB on hydrophilic substrates. Supported by sum-frequency generation spectroscopy results, we suggest that this effect is due to charge-binding of the surfactant with the substrate.
Collapse
Affiliation(s)
- Bijoy Bera
- Institute
of Physics, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Ellen H. G. Backus
- Institut
für Physikalische Chemie, Währinger Straße 42, 1090 Wien, Austria
- Max
Planck Institute for Polymer Research, Ackermannweg 10, D-35128 Mainz, Germany
| | - Odile Carrier
- Institute
of Physics, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, D-35128 Mainz, Germany
| | | | - Daniel Bonn
- Institute
of Physics, Science Park 904, 1098XH Amsterdam, The Netherlands
| |
Collapse
|
21
|
Vietze L, Backus EHG, Bonn M, Grechko M. Distinguishing different excitation pathways in two-dimensional terahertz-infrared-visible spectroscopy. J Chem Phys 2021; 154:174201. [PMID: 34241074 DOI: 10.1063/5.0047918] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
In condensed molecular matter, low-frequency modes (LFMs) associated with specific molecular motions are excited at room temperature and determine essential physical and chemical properties of materials. LFMs, with typical mode energies of up to ∼500 cm-1 (62 meV), contribute significantly to thermodynamic parameters and functions (e.g., heat capacity and entropy) and constitute the basis for room temperature molecular dynamics (e.g., conformational fluctuations and change). LFMs are often analyzed indirectly by the measurement of their effect on specific high-frequency modes (HFMs); the LFM-HFM coupling is reflected in the lineshape, as well as in the spectral and angular diffusion of the HFM. Two-dimensional terahertz-infrared-visible (2D TIRV) spectroscopy allows measuring the LFM-HFM coupling directly and can thereby provide new insights into the strength and nature of the coupling and the character of LFMs. However, the interference between the different signals generated by different excitation pathways can complicate 2D TIRV spectra, preventing a straightforward analysis. Here, we develop an experimental method to distinguish different excitation pathways in 2D TIRV spectroscopy and plot them separately in different quadrants of a 2D spectrum. We validate this method by measuring the spectra of CaF2 and nitrogen gas. For CaF2, only sum-frequency mixing between infrared and terahertz fields generates the signal. In contrast, for N2, only difference-frequency mixing is observed. We then use this method to separate sum- and difference-frequency pathways in the 2D TIRV spectrum of liquid water, verifying the previous interpretation of the lineshape of the 2D TIRV spectrum of water.
Collapse
Affiliation(s)
- Laura Vietze
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
| | - Ellen H G Backus
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
| | - Mischa Bonn
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
| | - Maksim Grechko
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
| |
Collapse
|
22
|
Backus EHG, Schaefer J, Bonn M. Probing the Mineral-Water Interface with Nonlinear Optical Spectroscopy. Angew Chem Int Ed Engl 2021; 60:10482-10501. [PMID: 32558984 PMCID: PMC8247323 DOI: 10.1002/anie.202003085] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/18/2020] [Indexed: 12/21/2022]
Abstract
The interaction between minerals and water is manifold and complex: the mineral surface can be (de)protonated by water, thereby changing its charge; mineral ions dissolved into the aqueous phase screen the surface charges. Both factors affect the interaction with water. Intrinsically molecular-level processes and interactions govern macroscopic phenomena, such as flow-induced dissolution, wetting, and charging. This realization is increasingly prompting molecular-level studies of mineral-water interfaces. Here, we provide an overview of recent developments in surface-specific nonlinear spectroscopy techniques such as sum frequency and second harmonic generation (SFG/SHG), which can provide information about the molecular arrangement of the first few layers of water molecules at the mineral surface. The results illustrate the subtleties of both chemical and physical interactions between water and the mineral as well as the critical role of mineral dissolution and other ions in solution for determining those interactions.
Collapse
Affiliation(s)
- Ellen H. G. Backus
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
- Department of Physical ChemistryUniversity of ViennaWähringer Strasse 421090ViennaAustria
| | - Jan Schaefer
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Mischa Bonn
- Max Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| |
Collapse
|
23
|
Affiliation(s)
- Ellen H. G. Backus
- Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
- Institut für Physikalische Chemie Universität Wien Währinger Straße 42 1090 Wien Österreich
| | - Jan Schaefer
- Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| | - Mischa Bonn
- Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| |
Collapse
|
24
|
Lukas M, Schwidetzky R, Kunert AT, Backus EHG, Pöschl U, Fröhlich-Nowoisky J, Bonn M, Meister K. Interfacial Water Ordering Is Insufficient to Explain Ice-Nucleating Protein Activity. J Phys Chem Lett 2021; 12:218-223. [PMID: 33326244 DOI: 10.1021/acs.jpclett.0c03163] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Ice-nucleating proteins (INPs) found in bacteria are the most effective ice nucleators known, enabling the crystallization of water at temperatures close to 0 °C. Although their function has been known for decades, the underlying mechanism is still under debate. Here, we show that INPs from Pseudomonas syringae in aqueous solution exhibit a defined solution structure and show no significant conformational changes upon cooling. In contrast, irreversible structural changes are observed upon heating to temperatures exceeding ∼55 °C, leading to a loss of the ice-nucleation activity. Sum-frequency generation (SFG) spectroscopy reveals that active and heat-inactivated INPs impose similar structural ordering of interfacial water molecules upon cooling. Our results demonstrate that increased water ordering is not sufficient to explain INPs' high ice-nucleation activity and confirm that intact three-dimensional protein structures are critical for bacterial ice nucleation, supporting a mechanism that depends on the INPs' supramolecular interactions.
Collapse
Affiliation(s)
- Max Lukas
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | | | - Anna T Kunert
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Ulrich Pöschl
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | | | - Mischa Bonn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Konrad Meister
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
- University of Alaska Southeast, Juneau, Alaska 99801, United States
| |
Collapse
|
25
|
Jin S, Liu Y, Deiseroth M, Liu J, Backus EHG, Li H, Xue H, Zhao L, Zeng XC, Bonn M, Wang J. Use of Ion Exchange To Regulate the Heterogeneous Ice Nucleation Efficiency of Mica. J Am Chem Soc 2020; 142:17956-17965. [PMID: 32985179 DOI: 10.1021/jacs.0c00920] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Heterogeneous ice nucleation (HIN) triggered by mineral surfaces typically exposed to various ions can have a significant impact on the regional atmosphere and climate. However, the dependence of HIN on the nature of the mineral surface ions is still largely unexplored due to the complexity of mineral surfaces. Because K+ on the atomically flat (001) surface of mica can be readily replaced by different cations through ion exchange, muscovite mica was selected; its simple nature provides a very straightforward system that can serve as the model for investigating the effects of mineral surface ions on HIN. Our experiments show that the surface (001) of H+-exchanged mica displays markedly higher HIN efficiencies than that of Na-/K-mica. Vibrational sum-frequency generation spectroscopy reveals that H-mica induces substantially less orientation ordering than Na-/K-mica within the contact water layer at the interface. Molecular dynamics simulations suggest that the HIN efficiency of mica depends on the positional arrangement and orientation of the interfacial water. The formation of the hexagonal ice Ih basal-type structure in the first water layer atop the mica surface facilitates HIN, which is determined by the size of the protruding ions atop the mica surface and by the surface adsorption energy. The orientational distribution is optimal for HIN when 25% of the water molecules in the first water layer atop the mica surface have one OH group pointing up and 25% have one OH group pointing down, which, in turn, is determined by the surface charge distribution.
Collapse
Affiliation(s)
- Shenglin Jin
- Key Laboratory of Green Printing, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yuan Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.,Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Malte Deiseroth
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Jie Liu
- Key Laboratory of Green Printing, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany.,Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Wien, Austria
| | - Hui Li
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Han Xue
- Key Laboratory of Green Printing, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Lishan Zhao
- Key Laboratory of Green Printing, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiao Cheng Zeng
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Jianjun Wang
- Key Laboratory of Green Printing, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
26
|
Haroun F, El Haitami A, Ober P, Backus EHG, Cantin S. Poly(ethylene glycol)- block-poly(propylene glycol)- block-poly(ethylene glycol) Copolymer 2D Single Network at the Air-Water Interface. Langmuir 2020; 36:9142-9152. [PMID: 32686418 DOI: 10.1021/acs.langmuir.0c01398] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this work, Langmuir monolayers based on poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) triblock copolymer were in situ stabilized at the air-water interface in the presence of a cross-linking agent, benzene-1,3,5-tricarboxaldehyde (BTC), in the aqueous subphase. The reaction takes place through acid-catalyzed acetalization between the terminal hydroxyl groups of the copolymer and aldehyde functions of the BTC molecules. Mean area per repeat unit measurements as a function of the reaction time show a significant monolayer contraction associated with an increase in its compressibility modulus. In addition, Brewster angle microscopy observations indicate the appearance of higher-density two-dimensional domains, irreversibly formed at constant surface pressure. This is also confirmed on a smaller scale by atomic force microscopy (AFM). These arguments, consistent with copolymer monolayer cross-linking in acidic medium, are supported in situ at the air-water interface by sum-frequency generation (SFG) spectroscopy. Furthermore, PEG-PPG-PEG monolayer cross-linking is not evidenced in alkaline medium, in coherence with the interfacial acid-catalyzed acetalization.
Collapse
Affiliation(s)
- Ferhat Haroun
- LPPI, CY Cergy Paris Université, F95000 Cergy, France
| | | | - Patrick Ober
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Sophie Cantin
- LPPI, CY Cergy Paris Université, F95000 Cergy, France
| |
Collapse
|
27
|
Lesnicki D, Zhang Z, Bonn M, Sulpizi M, Backus EHG. Oberflächenladungen an der CaF
2
‐Wasser‐Grenzfläche erlauben eine sehr schnelle intermolekulare Übertragung von Schwingungsenergie. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dominika Lesnicki
- Institut für Physik Johannes Gutenberg Universität Mainz Staudingerweg 7 55099 Mainz Deutschland
| | - Zhen Zhang
- Abteilung für molekulare Spektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| | - Mischa Bonn
- Abteilung für molekulare Spektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
| | - Marialore Sulpizi
- Institut für Physik Johannes Gutenberg Universität Mainz Staudingerweg 7 55099 Mainz Deutschland
| | - Ellen H. G. Backus
- Abteilung für molekulare Spektroskopie Max-Planck-Institut für Polymerforschung Ackermannweg 10 55128 Mainz Deutschland
- Fachbereich für Physikalische Chemie Universität Wien Währinger Strasse 42 1090 Vienna Österreich
| |
Collapse
|
28
|
Abstract
![]()
Insights
into energy flow dynamics at ice surfaces are essential
for understanding chemical dynamics relevant to atmospheric and geographical
sciences. Here, employing ultrafast surface-specific spectroscopy,
we report the interfacial vibrational dynamics of ice Ih. A comparison to liquid water surfaces reveals accelerated vibrational
energy relaxation and dissipation at the ice surface for hydrogen-bonded
OH groups. In contrast, free-OH groups sticking into the vapor phase
exhibit substantially slower vibrational dynamics on ice. The acceleration
and deceleration of vibrational dynamics of these different OH groups
at the ice surface are attributed to enhanced intermolecular coupling
and reduced rotational mobility, respectively. Our results highlight
the unique properties of free-OH groups on ice, putatively linked
to the high catalytic activities of ice surfaces.
Collapse
Affiliation(s)
- Prerna Sudera
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Jenée D Cyran
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany.,Baylor University, Waco, Texas 76798, United States
| | - Malte Deiseroth
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany.,University of Vienna, 1090 Vienna, Austria
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| |
Collapse
|
29
|
Lesnicki D, Zhang Z, Bonn M, Sulpizi M, Backus EHG. Surface Charges at the CaF 2 /Water Interface Allow Very Fast Intermolecular Vibrational-Energy Transfer. Angew Chem Int Ed Engl 2020; 59:13116-13121. [PMID: 32239715 PMCID: PMC7496624 DOI: 10.1002/anie.202004686] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Indexed: 01/15/2023]
Abstract
We investigate the dynamics of water in contact with solid calcium fluoride, where at low pH, localized charges can develop upon fluorite dissolution. We use 2D surface‐specific vibrational spectroscopy to quantify the heterogeneity of the interfacial water (D2O) molecules and provide information about the sub‐picosecond vibrational‐energy‐relaxation dynamics at the buried solid/liquid interface. We find that strongly H‐bonded OD groups, with a vibrational frequency below 2500 cm−1, display very rapid spectral diffusion and vibrational relaxation; for weakly H‐bonded OD groups, above 2500 cm−1, the dynamics slows down substantially. Atomistic simulations based on electronic‐structure theory reveal the molecular origin of energy transport through the local H‐bond network. We conclude that strongly oriented H‐bonded water molecules in the adsorbed layer, whose orientation is pinned by the localized charge defects, can exchange vibrational energy very rapidly due to the strong collective dipole, compensating for a partially missing solvation shell.
Collapse
Affiliation(s)
- Dominika Lesnicki
- Institute of Physics, JohannesGutenberg University MainzStaudingerweg 755099MainzGermany
| | - Zhen Zhang
- Department for Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Mischa Bonn
- Department for Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
| | - Marialore Sulpizi
- Institute of Physics, JohannesGutenberg University MainzStaudingerweg 755099MainzGermany
| | - Ellen H. G. Backus
- Department for Molecular SpectroscopyMax Planck Institute for Polymer ResearchAckermannweg 1055128MainzGermany
- Department of Physical ChemistryUniversity of ViennaWähringer Strasse 421090ViennaAustria
| |
Collapse
|
30
|
Abstract
Zwitterionic phospholipids are one of the main constituents of biological membranes. The electric field associated with the two opposite headgroup charges aligns water molecules in the headgroup region. Here, we study the role of water alignment on the sub-picosecond vibrational dynamics of lipid-bound water. To this end, we compare the dynamics of oppositely oriented water associated with, respectively, a phosphocholine (PC) headgroup and an inverse-phosphocholine with non-ethylated phosphate groups (CP). We find that the dynamics are independent of the water orientation, implying that the vibrational dynamics report on the local properties of the water molecules.
Collapse
Affiliation(s)
- Malte Deiseroth
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. and Department of Physical Chemisty, University of Vienna, Währinger Straße 42, 1090 Wien, Austria
| |
Collapse
|
31
|
Seki T, Yu CC, Yu X, Ohto T, Sun S, Meister K, Backus EHG, Bonn M, Nagata Y. Decoding the molecular water structure at complex interfaces through surface-specific spectroscopy of the water bending mode. Phys Chem Chem Phys 2020; 22:10934-10940. [PMID: 32373844 DOI: 10.1039/d0cp01269f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The structure of interfacial water determines atmospheric chemistry, wetting properties of materials, and protein folding. The challenge of investigating the properties of specific interfacial water molecules has frequently been confronted using surface-specific sum-frequency generation (SFG) vibrational spectroscopy using the O-H stretch mode. While perfectly suited for the water-air interface, for complex interfaces, a potential complication arises from the contribution of hydroxyl or amine groups of non-water species present at the surface, such as surface hydroxyls on minerals, or O-H and N-H groups contained in proteins. Here, we present a protocol to extract the hydrogen bond strength selectively of interfacial water, through the water bending mode. The bending mode vibrational frequency distribution provides a new avenue for unveiling the hydrogen bonding structure of interfacial water at complex aqueous interfaces. We demonstrate this method for the water-CaF2 and water-protein interfaces. For the former, we show that this method can indeed single out water O-H groups from surface hydroxyls, and that with increasing pH, the hydrogen-bonded network of interfacial water strengthens. Furthermore, we unveil enhanced hydrogen bonding of water, compared to bulk water, at the interface with human serum albumin proteins, a prototypical bio-interface.
Collapse
Affiliation(s)
- Takakazu Seki
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Tang F, Ohto T, Sun S, Rouxel JR, Imoto S, Backus EHG, Mukamel S, Bonn M, Nagata Y. Molecular Structure and Modeling of Water-Air and Ice-Air Interfaces Monitored by Sum-Frequency Generation. Chem Rev 2020; 120:3633-3667. [PMID: 32141737 PMCID: PMC7181271 DOI: 10.1021/acs.chemrev.9b00512] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Indexed: 12/26/2022]
Abstract
From a glass of water to glaciers in Antarctica, water-air and ice-air interfaces are abundant on Earth. Molecular-level structure and dynamics at these interfaces are key for understanding many chemical/physical/atmospheric processes including the slipperiness of ice surfaces, the surface tension of water, and evaporation/sublimation of water. Sum-frequency generation (SFG) spectroscopy is a powerful tool to probe the molecular-level structure of these interfaces because SFG can specifically probe the topmost interfacial water molecules separately from the bulk and is sensitive to molecular conformation. Nevertheless, experimental SFG has several limitations. For example, SFG cannot provide information on the depth of the interface and how the orientation of the molecules varies with distance from the surface. By combining the SFG spectroscopy with simulation techniques, one can directly compare the experimental data with the simulated SFG spectra, allowing us to unveil the molecular-level structure of water-air and ice-air interfaces. Here, we present an overview of the different simulation protocols available for SFG spectra calculations. We systematically compare the SFG spectra computed with different approaches, revealing the advantages and disadvantages of the different methods. Furthermore, we account for the findings through combined SFG experiments and simulations and provide future challenges for SFG experiments and simulations at different aqueous interfaces.
Collapse
Affiliation(s)
- Fujie Tang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Department
of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Tatsuhiko Ohto
- Graduate
School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Shumei Sun
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Jérémy R. Rouxel
- Department
of Chemistry and Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Sho Imoto
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Ellen H. G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Shaul Mukamel
- Department
of Chemistry and Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Yuki Nagata
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
- Department
of Physics, State Key Laboratory of Surface Physics and Key Laboratory
of Micro- and Nano-Photonic Structures (MOE), Fudan University, Shanghai 200433, China
| |
Collapse
|
33
|
Vaillard AS, El Haitami A, Dreier LB, Backus EHG, Cantin S. Correction to "Confinement and Cross-Linking of 1,2-Polybutadiene in 2D at the Air-Water Interface". Langmuir 2020; 36:2741. [PMID: 32134678 DOI: 10.1021/acs.langmuir.0c00525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
|
34
|
Vaillard AS, El Haitami A, Dreier LB, Backus EHG, Cantin S. Confinement and Cross-Linking of 1,2-Polybutadiene in Two Dimensions at the Air-Water Interface. Langmuir 2020; 36:862-871. [PMID: 31935102 DOI: 10.1021/acs.langmuir.9b03297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Langmuir monolayers of 1,2-polybutadiene (PB) were investigated by means of surface pressure-area isotherms, Brewster angle microscopy (BAM) observations, and sum-frequency generation (SFG) spectroscopy. A homogeneous and stable monolayer is formed 1.5 h after PB spreading provided that both light and oxygen are present. This was attributed to a slight oxidation of the PB at the air-water interface. The cross-linking of PB under UV photoirradiation was then studied. SFG spectroscopy demonstrates the in situ formation of a two-dimensional network. From surface pressure-area characterizations and BAM experiments, the cross-linked PB monolayer appears significantly denser and more rigid than the non-irradiated monolayer. Atomic force microscopy images reveal an increase by a factor of three in the root-mean-square roughness of the irradiated monolayers compared with the non-irradiated ones.
Collapse
Affiliation(s)
- Anne-Sophie Vaillard
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI, EA 2528) , Institut des Matériaux, CY Cergy Paris Université , 5 mail Gay-Lussac Neuville/Oise , Cergy-Pontoise Cedex 95031 , France
| | - Alae El Haitami
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI, EA 2528) , Institut des Matériaux, CY Cergy Paris Université , 5 mail Gay-Lussac Neuville/Oise , Cergy-Pontoise Cedex 95031 , France
| | - Lisa B Dreier
- Max Planck Institute for Polymer Research , Ackermannweg 10 , Mainz 55128 , Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research , Ackermannweg 10 , Mainz 55128 , Germany
- Department of Physical Chemistry , Währinger Strasse 42 , Vienna A-1090 , Austria
| | - Sophie Cantin
- Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI, EA 2528) , Institut des Matériaux, CY Cergy Paris Université , 5 mail Gay-Lussac Neuville/Oise , Cergy-Pontoise Cedex 95031 , France
| |
Collapse
|
35
|
Abstract
Understanding the interfacial molecular structure of acidic aqueous solutions is important in the context of, e.g., atmospheric chemistry, biophysics, and electrochemistry. The hydration of the interfacial proton is necessarily different from that in the bulk, given the lower effective density of water at the interface, but has not yet been elucidated. Here, using surface-specific vibrational spectroscopy, we probe the response of interfacial protons at the water-air interface and reveal the interfacial proton continuum. Combined with spectral calculations based on ab initio molecular dynamics simulations, the proton at the water-air interface is shown to be well-hydrated, despite the limited availability of hydration water, with both Eigen and Zundel structures coexisting at the interface. Notwithstanding the interfacial hydrated proton exhibiting bulk-like structures, a substantial interfacial stabilization by -1.3 ± 0.2 kcal/mol is observed experimentally, in good agreement with our free energy calculations. The surface propensity of the proton can be attributed to the interaction between the hydrated proton and its counterion.
Collapse
Affiliation(s)
- Sudipta Das
- Department
for Molecular Spectroscopy, Max Planck Institute
for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Sho Imoto
- Department
for Molecular Spectroscopy, Max Planck Institute
for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Shumei Sun
- Department
for Molecular Spectroscopy, Max Planck Institute
for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Yuki Nagata
- Department
for Molecular Spectroscopy, Max Planck Institute
for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H. G. Backus
- Department
for Molecular Spectroscopy, Max Planck Institute
for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Mischa Bonn
- Department
for Molecular Spectroscopy, Max Planck Institute
for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
36
|
Abstract
Surfaces and interfaces play important roles in many processes and reactions and are therefore intensively studied, often with the aim of obtaining molecular-level information from just the interfacial layer. Generally, only the first few molecular layers next to the interface are relevant for the surface processes. In the past decades, 2nd-order nonlinear spectroscopies including sum-frequency generation and second harmonic generation have developed into powerful tools for obtaining molecularly specific insights into the interfacial region. These approaches have contributed substantially to our understanding of a wide range of physical phenomena. However, along with their wide-ranging applications, it has been realized that the implied surface-specificity of these approaches may not always be warranted. Specifically, the bulk quadrupole contribution beyond the electric dipole-approximation for a system with a weak nonlinear interface signal, as well as the diffuse layer contribution at charged interfaces, could mask the surface information. In this perspective paper, we discuss the surface-specificity of 2nd-order nonlinear spectroscopy, especially considering these two contributions.
Collapse
Affiliation(s)
- Shumei Sun
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Jan Schaefer
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
37
|
Seki T, Sun S, Zhong K, Yu CC, Machel K, Dreier LB, Backus EHG, Bonn M, Nagata Y. Unveiling Heterogeneity of Interfacial Water through the Water Bending Mode. J Phys Chem Lett 2019; 10:6936-6941. [PMID: 31647677 PMCID: PMC6844124 DOI: 10.1021/acs.jpclett.9b02748] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 10/24/2019] [Indexed: 05/28/2023]
Abstract
The water bending mode provides a powerful probe of the microscopic structure of bulk aqueous systems because its frequency and spectral line shape are responsive to the intermolecular interactions. Furthermore, interpreting the bending mode response is straightforward, as the intramolecular vibrational coupling is absent. Nevertheless, bending mode has not been used for probing the interfacial water structure, as it has been yet argued that the signal is dominated by bulk effects. Here, through the sum-frequency generation measurement of the water bending mode at the water/air and water/charged lipid interfaces, we demonstrate that the bending mode signal is dominated not by the bulk but by the interface. Subsequently, we disentangle the hydrogen-bonding of water at the water/air interface using the bending mode frequency distribution and find distinct interfacial hydrogen-bonded structures, which can be directly related to the interfacial organization of water. The bending mode thus provides an excellent probe of aqueous interfacial structure.
Collapse
Affiliation(s)
- Takakazu Seki
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Shumei Sun
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Kai Zhong
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Chun-Chieh Yu
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Kevin Machel
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Lisa B. Dreier
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H. G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090 Vienna, Austria
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Yuki Nagata
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
38
|
Abstract
The structure of water molecules in contact with zwitterionic lipid molecules is of great biological relevance, because biological membranes are largely composed of such lipids. The interaction of the interfacial water molecules with the amphiphilic lipid molecules drives the formation of membranes and greatly influences various processes at the membrane surface, as the field that arises from the aligned interfacial water molecules masks the charges of the lipid headgroups from the approaching metabolites. To increase our understanding of the influence of water molecules on biological processes we study their structure at the interface using sum-frequency generation spectroscopy and molecular dynamics simulations. Interestingly, we find that water molecules at zwitterionic lipid molecules are mainly oriented by the field arising between the two oppositely charged molecular moieties within the lipid headgroups.
Collapse
Affiliation(s)
- Lisa B Dreier
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
- Graduate School Materials Science in Mainz , Staudingerweg 9 , 55128 Mainz , Germany
| | - Amanuel Wolde-Kidan
- Fachbereich Physik , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Douwe Jan Bonthuis
- Institute of Theoretical and Computational Physics , Graz University of Technology , 8010 Graz , Austria
| | - Roland R Netz
- Fachbereich Physik , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
- Department of Physical Chemistry , University of Vienna , Währinger Strasse 42 , 1090 Vienna , Austria
| | - Mischa Bonn
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| |
Collapse
|
39
|
Affiliation(s)
- Sudipta Das
- Department of Molecular Spectroscopy Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Deutschland
| | - Mischa Bonn
- Department of Molecular Spectroscopy Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Deutschland
| | - Ellen H. G. Backus
- Department of Physical Chemistry University of Vienna Währinger Strasse 42 1090 Vienna Österreich
- Department of Molecular Spectroscopy Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Deutschland
| |
Collapse
|
40
|
Das S, Bonn M, Backus EHG. The Surface Activity of the Hydrated Proton Is Substantially Higher than That of the Hydroxide Ion. Angew Chem Int Ed Engl 2019; 58:15636-15639. [PMID: 31418999 PMCID: PMC6856863 DOI: 10.1002/anie.201908420] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Indexed: 11/30/2022]
Abstract
The behavior of hydroxide and hydrated protons, the auto‐ionization products of water, at surfaces is important for a wide range of applications and disciplines. However, it is unknown at which bulk concentration these ions start to become surface active at the water–air interface. Here, we report changes in the D2O–air interface in the presence of excess D+hyd/OD−hyd determined using surface‐sensitive vibrational sum‐frequency generation (SFG) spectroscopy. The onset of the perturbation of the D2O surface occurs at a bulk concentration as low as 2.7±0.2 mm D+hyd. In contrast, a concentration of several hundred mm OD−hyd is required to change the D2O surface. The hydrated proton is thus orders of magnitude more surface‐active than hydroxide at the water–air interface.
Collapse
Affiliation(s)
- Sudipta Das
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Mischa Bonn
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Ellen H G Backus
- Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090, Vienna, Austria.,Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| |
Collapse
|
41
|
Affiliation(s)
- Malte Deiseroth
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H. G. Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemisty, University of Vienna, Währinger Straße 42, 1090 Wien, Austria
| |
Collapse
|
42
|
Affiliation(s)
- Shumei Sun
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Fujie Tang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- International Center for Quantum Materials, Department of Physics, Peking University, 5 Yiheyuan Road, Haidian, Beijing 100871, China
| | - Sho Imoto
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Daniel R Moberg
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Tatsuhiko Ohto
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Francesco Paesani
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Yuki Nagata
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
43
|
Abstract
![]()
The ice
premelt, often called the quasi-liquid layer (QLL), is
key for the lubrication of ice, gas uptake by ice, and growth of aerosols.
Despite its apparent importance, in-depth understanding of the ice
premelt from the microscopic to the macroscopic scale has not been
gained. By reviewing data obtained using molecular dynamics (MD) simulations,
sum-frequency generation (SFG) spectroscopy, and laser confocal differential
interference contrast microscopy (LCM-DIM), we provide a unified view
of the experimentally observed variation in quasi-liquid (QL) states.
In particular, we disentangle three distinct types of QL states of
disordered layers, QL-droplet, and QL-film and discuss their nature. The topmost ice layer is energetically unstable, as the topmost
interfacial H2O molecules lose a hydrogen bonding partner,
generating a disordered layer at the ice–air interface. This
disordered layer is homogeneously distributed over the ice surface.
The nature of the disordered layer changes over a wide temperature
range from −90 °C to the bulk melting point. Combined
MD simulations and SFG measurements reveal that the topmost ice surface
starts to be disordered around −90 °C through a process
that the topmost water molecules with three hydrogen bonds convert
to a doubly hydrogen-bonded species. When the temperature is further
increased, the second layer starts to become disordered at around
−16 °C. This disordering occurs not in a gradual manner,
but in a bilayer-by-bilayer manner. When the temperature reaches
−2 °C, more complicated
structures, QL-droplet and QL-film, emerge on the top of the ice surface.
These QL-droplets and QL-films are inhomogeneously distributed, in
contrast to the disordered layer. We show that these QL-droplet and
QL-film emerge only under supersaturated/undersaturated vapor pressure
conditions, as partial and pseudopartial wetting states, respectively.
Experiments with precisely controlled pressure show that, near the
water vapor pressure at the vapor-ice equilibrium condition, no QL-droplet
and QL-film can be observed, implying that the QL-droplet and QL-film
emerge exclusively under nonequilibrium conditions, as opposed to
the disordered layers formed under equilibrium conditions. These
findings are connected with many phenomena related to the
ice surface. For example, we explain how the disordering of the topmost
ice surface governs the slipperiness of the ice surface, allowing
for ice skating. Further focus is on the gas uptake mechanism on the
ice surface. Finally, we note the unresolved questions and future
challenges regarding the ice premelt.
Collapse
Affiliation(s)
- Yuki Nagata
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Tetsuya Hama
- Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
| | - Ellen H. G. Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Physical Chemistry, University of Vienna, Waehringer Strasse 42, 1090 Vienna, Austria
| | - Markus Mezger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | - Daniel Bonn
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Gen Sazaki
- Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
| |
Collapse
|
44
|
Sun S, Bisson PJ, Bonn M, Shultz MJ, Backus EHG. Phase-Sensitive Sum-Frequency Generation Measurements Using a Femtosecond Nonlinear Interferometer. J Phys Chem C Nanomater Interfaces 2019; 123:7266-7270. [PMID: 30949276 PMCID: PMC6443213 DOI: 10.1021/acs.jpcc.9b00861] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/06/2019] [Indexed: 05/25/2023]
Abstract
Phase-sensitive sum-frequency spectroscopy is a unique tool to interrogate the vibrational structure of interfaces. A precise understanding of the interfacial structure often relies on accurately determining the phase of χ(2), which has recently been demonstrated using a nonlinear interferometer in conjunction with a frequency-scanning picosecond laser system. Here, we implement nonlinear interferometry using a femtosecond laser system for broadband sum-frequency generation. The phase of the vibrational response from a self-assembled monolayer of octadecanethiol on gold is determined using the nonlinear femtosecond interferometer. The results are compared to those obtained using the more traditional heterodyne-detected phase measurements. Both methods give a similar phase spectrum and phase uncertainty. We also discuss the origin of the phase uncertainties and provide guidelines for further improvement.
Collapse
Affiliation(s)
- Shumei Sun
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Str. 42, 1090 Wien, Austria
| | - Patrick J. Bisson
- Laboratory
for Water and Surface Studies, Chemistry Department, Tufts University, Medford, Massachusetts 02155, United States
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mary Jane Shultz
- Laboratory
for Water and Surface Studies, Chemistry Department, Tufts University, Medford, Massachusetts 02155, United States
| | - Ellen H. G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Str. 42, 1090 Wien, Austria
| |
Collapse
|
45
|
Abstract
Small organic molecules on ice and water surfaces are ubiquitous in nature and play a crucial role in many environmentally relevant processes. Herein, we combine surface‐specific vibrational spectroscopy and a controllable flow cell apparatus to investigate the molecular adsorption of acetone onto the basal plane of single‐crystalline hexagonal ice with a large surface area. By comparing the adsorption of acetone on the ice/air and the water/air interface, we observed two different types of acetone adsorption, as apparent from the different responses of both the free O−H and the hydrogen‐bonded network vibrations for ice and liquid water. Adsorption on ice occurs preferentially through interactions with the free OH group, while the interaction of acetone with the surface of liquid water appears less specific.
Collapse
Affiliation(s)
- Jenée D Cyran
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Ellen H G Backus
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.,Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, 1090, Vienna, Austria
| | - Marc-Jan van Zadel
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Mischa Bonn
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| |
Collapse
|
46
|
Abstract
Specific ion effects at interfaces are important for a variety of thermodynamic properties of electrolyte solutions, like surface tension and the phase behavior of surfactants. We report the relative surface affinity of Na+ and D3O+ at both the D2O-air and the sodium dodecyl sulfate (surfactant)-covered D2O surface by studying the alignment of interfacial D2O, using vibrational sum frequency generation spectroscopy. The surface propensity of ions is found to be a function of both the nature of the ion and the nature of the surface. Specifically, for the charged, surfactant-covered interface, Na+ has a higher affinity than D3O+. In contrast, D3O+ has a higher affinity than Na+ at the air-D2O interface. The relative surface affinity of cations thus depends on both details of the cation and the type of interface.
Collapse
Affiliation(s)
- Sudipta Das
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
47
|
Abstract
The carbonyl groups of glycerolipid monolayers on water play an important role in the formation of the interfacial hydrogen bond network, which in turn influences the interactions of lipids with, for example, metabolites. As the frequency of the carbonyl absorption band strongly depends on the hydration state of the lipid headgroups, the carbonyl band is a sensitive reporter of changes in the headgroup environment. Here, we use phase-resolved sum frequency generation spectroscopy to obtain information about the orientation and hydration of the carbonyl groups in lipid monolayers. We find that there are two distinct carbonyl moieties in the lipid monolayers, oppositely oriented relative to the surface plane, that experience substantially different hydrogen-bonding environments.
Collapse
Affiliation(s)
- L B Dreier
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany.,Graduate School Materials Science in Mainz , Staudingerweg 9 , 55128 Mainz , Germany
| | - M Bonn
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany
| | - E H G Backus
- Max Planck Institute for Polymer Research , Ackermannweg 10 , 55128 Mainz , Germany.,Department of Physical Chemistry , University of Vienna , Währinger Strasse 42 , 1090 Vienna , Austria
| |
Collapse
|
48
|
Schlegel SJ, Hosseinpour S, Gebhard M, Devi A, Bonn M, Backus EHG. How water flips at charged titanium dioxide: an SFG-study on the water–TiO2 interface. Phys Chem Chem Phys 2019; 21:8956-8964. [DOI: 10.1039/c9cp01131e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photocatalytic splitting of water into hydrogen and oxygen by utilizing sunlight and a photocatalyst is a promising way of generating clean energy.
Collapse
Affiliation(s)
| | | | | | - Anjana Devi
- Inorganic Materials Chemistry
- Ruhr-University Bochum
- 44801 Bochum
- Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research
- 55128 Mainz
- Germany
| | - Ellen H. G. Backus
- Max Planck Institute for Polymer Research
- 55128 Mainz
- Germany
- Department of Physical Chemistry
- University of Vienna
| |
Collapse
|
49
|
Sun S, Tang F, Imoto S, Moberg DR, Ohto T, Paesani F, Bonn M, Backus EHG, Nagata Y. Orientational Distribution of Free O-H Groups of Interfacial Water is Exponential. Phys Rev Lett 2018; 121:246101. [PMID: 30608741 DOI: 10.1103/physrevlett.121.246101] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 11/09/2018] [Indexed: 06/09/2023]
Abstract
The orientational distribution of free O-H (O-D) groups at the H_{2}O- (D_{2}O-)air interface is investigated using combined molecular dynamics (MD) simulations and sum-frequency generation (SFG) experiments. The average angle of the free O-H groups, relative to the surface normal, is found to be ∼63°, substantially larger than previous estimates of 30°-40°. This discrepancy can be traced to erroneously assumed Gaussian or stepwise orientational distributions of free O-H groups. Instead, the MD simulation and SFG measurement reveal a broad and exponentially decaying orientational distribution. The broad orientational distribution indicates the presence of the free O-H group pointing down to the bulk. We ascribe the origin of such free O-H groups to the presence of capillary waves on the water surface.
Collapse
Affiliation(s)
- Shumei Sun
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Fujie Tang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- International Center for Quantum Materials, School of Physics, Peking University, 5 Yiheyuan Road, Haidian, Beijing 100871, China
| | - Sho Imoto
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Daniel R Moberg
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Tatsuhiko Ohto
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | - Francesco Paesani
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H G Backus
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Yuki Nagata
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
50
|
Abdelmonem A, Backus EHG, Bonn M. Ice Nucleation at the Water-Sapphire Interface: Transient Sum-Frequency Response without Evidence for Transient Ice Phase. J Phys Chem C Nanomater Interfaces 2018; 122:24760-24764. [PMID: 30450149 PMCID: PMC6231158 DOI: 10.1021/acs.jpcc.8b07480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/09/2018] [Indexed: 06/09/2023]
Abstract
Heterogeneous ice nucleation at the water-sapphire interface is studied using sum-frequency generation spectroscopy. We follow the response of the O-H stretch mode of interfacial water during ice nucleation as a function of time and temperature. The ice and liquid states each exhibit very distinct, largely temperature-independent responses. However, at the moment of freezing, a transient response with a significantly different intensity is observed, with a lifetime between several seconds and several minutes. The presence of this transient signal has previously been attributed to a transient phase of ice. Here, we demonstrate that the transient signal can be explained without invoking a transient ice phase, as the transient signal can simply be accounted for by a linear combination of time-dependent liquid and ice responses.
Collapse
Affiliation(s)
- Ahmed Abdelmonem
- Institute
of Meteorology and Climate Research—Atmospheric Aerosol Research
(IMKAAF), Karlsruhe Institute of Technology
(KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Ellen H. G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|