1
|
Yu CC, Imoto S, Seki T, Chiang KY, Sun S, Bonn M, Nagata Y. Accurate molecular orientation at interfaces determined by multimode polarization-dependent heterodyne-detected sum-frequency generation spectroscopy via multidimensional orientational distribution function. J Chem Phys 2022; 156:094703. [DOI: 10.1063/5.0081209] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Many essential processes occur at soft interfaces, from chemical reactions on aqueous aerosols in the atmosphere to biochemical recognition and binding at the surface of cell membranes. The spatial arrangement of molecules specifically at these interfaces is crucial for many of such processes. The accurate determination of the interfacial molecular orientation has been challenging due to the low number of molecules at interfaces and the ambiguity of their orientational distribution. Here, we combine phase- and polarization-resolved sum-frequency generation (SFG) spectroscopy to obtain the molecular orientation at the interface. We extend an exponentially decaying orientational distribution to multiple dimensions, which, in conjunction with multiple SFG datasets obtained from the different vibrational modes, allows us to determine the molecular orientation. We apply this new approach to formic acid molecules at the air–water interface. The inferred orientation of formic acid agrees very well with ab initio molecular dynamics data. The phase-resolved SFG multimode analysis scheme using the multidimensional orientational distribution thus provides a universal approach for obtaining the interfacial molecular orientation.
Collapse
Affiliation(s)
- Chun-Chieh Yu
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Sho Imoto
- Analysis Technology Center, Fujifilm R&D, 210 Nakanuma, Minamiashigara, Kanagawa 250-0123, Japan
| | - Takakazu Seki
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Kuo-Yang Chiang
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Shumei Sun
- Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, 100875 Beijing, China
| | - Mischa Bonn
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Yuki Nagata
- Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| |
Collapse
|
2
|
Moll CJ, Versluis J, Bakker HJ. Bulk Response of Carboxylic Acid Solutions Observed with Surface Sum-Frequency Generation Spectroscopy. J Phys Chem B 2021; 126:270-277. [PMID: 34962792 PMCID: PMC8762667 DOI: 10.1021/acs.jpcb.1c09051] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
We study the molecular
properties of aqueous acetic acid and formic
acid solutions with heterodyne-detected vibrational sum-frequency
generation spectroscopy (HD-VSFG). For acid concentrations up to ∼5
M, we observe a strong increase of the responses of the acid hydroxyl
and carbonyl stretch vibrations with increasing acid concentration
due to an increase of the surface coverage by the acid molecules.
At acid concentrations >5 M we observe first a saturation of these
responses and then a decrease. For pure carboxylic acids we even observe
a change of sign of the Im[χ(2)] response of the
carbonyl vibration. The decrease of the response of the hydroxyl vibration
and the decrease and sign change of the response of the carbonyl vibration
indicate the formation of cyclic dimers, which only show a quadrupolar
bulk response in the HD-VSFG spectrum because of their antiparallel
conformation. We also find evidence for the presence of a quadrupolar
response of the CH vibrations of the acid molecules.
Collapse
Affiliation(s)
- Carolyn J Moll
- Ultrafast Spectroscopy, AMOLF, Science Park 104,1098 XG Amsterdam, Netherlands
| | - Jan Versluis
- Ultrafast Spectroscopy, AMOLF, Science Park 104,1098 XG Amsterdam, Netherlands
| | - Huib J Bakker
- Ultrafast Spectroscopy, AMOLF, Science Park 104,1098 XG Amsterdam, Netherlands
| |
Collapse
|
3
|
Moll CJ, Giubertoni G, van Buren L, Versluis J, Koenderink GH, Bakker HJ. Molecular Structure and Surface Accumulation Dynamics of Hyaluronan at the Water-Air Interface. Macromolecules 2021; 54:8655-8663. [PMID: 34602653 PMCID: PMC8482758 DOI: 10.1021/acs.macromol.1c00366] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Indexed: 11/30/2022]
Abstract
![]()
Hyaluronan is a biopolymer
that is essential for many biological
processes in the human body, like the regulation of tissue lubrication
and inflammatory responses. Here, we study the behavior of hyaluronan
at aqueous surfaces using heterodyne-detected vibrational sum-frequency
generation spectroscopy (HD-VSFG). Low-molecular-weight hyaluronan
(∼150 kDa) gradually covers the water–air interface
within hours, leading to a negatively charged surface and a reorientation
of interfacial water molecules. The rate of surface accumulation strongly
increases when the bulk concentration of low-molecular-weight hyaluronan
is increased. In contrast, high-molecular-weight hyaluronan (>1
MDa)
cannot be detected at the surface, even hours after the addition of
the polymer to the aqueous solution. The strong dependence on the
polymer molecular weight can be explained by entanglements of the
hyaluronan polymers. We also find that for low-molecular-weight hyaluronan
the migration kinetics of hyaluronan in aqueous media shows an anomalous
dependence on the pH of the solution, which can be explained from
the interplay of hydrogen bonding and electrostatic interactions of
hyaluronan polymers.
Collapse
Affiliation(s)
- Carolyn J Moll
- Amolf, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Giulia Giubertoni
- Amolf, Science Park 104, 1098 XG Amsterdam, The Netherlands.,Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Lennard van Buren
- Amolf, Science Park 104, 1098 XG Amsterdam, The Netherlands.,Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Jan Versluis
- Amolf, Science Park 104, 1098 XG Amsterdam, The Netherlands
| | - Gijsje H Koenderink
- Amolf, Science Park 104, 1098 XG Amsterdam, The Netherlands.,Department of Bionanoscience, Kavli Institute of Nanoscience Delft, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Huib J Bakker
- Amolf, Science Park 104, 1098 XG Amsterdam, The Netherlands
| |
Collapse
|
4
|
Savchenko V, Ekholm V, Brumboiu IE, Norman P, Pietzsch A, Föhlisch A, Rubensson JE, Gråsjö J, Björneholm O, Såthe C, Dong M, Schmitt T, McNally D, Lu X, Krasnov P, Polyutov SP, Gel'mukhanov F, Odelius M, Kimberg V. Hydrogen bond effects in multimode nuclear dynamics of acetic acid observed via resonant x-ray scattering. J Chem Phys 2021; 154:214304. [PMID: 34240997 DOI: 10.1063/5.0049966] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A theoretical and experimental study of the gas phase and liquid acetic acid based on resonant inelastic x-ray scattering (RIXS) spectroscopy is presented. We combine and compare different levels of theory for an isolated molecule for a comprehensive analysis, including electronic and vibrational degrees of freedom. The excitation energy scan over the oxygen K-edge absorption reveals nuclear dynamic effects in the core-excited and final electronic states. The theoretical simulations for the monomer and two different forms of the dimer are compared against high-resolution experimental data for pure liquid acetic acid. We show that the theoretical model based on a dimer describes the hydrogen bond formation in the liquid phase well and that this bond formation sufficiently alters the RIXS spectra, allowing us to trace these effects directly from the experiment. Multimode vibrational dynamics is accounted for in our simulations by using a hybrid time-dependent stationary approach for the quantum nuclear wave packet simulations, showing the important role it plays in RIXS.
Collapse
Affiliation(s)
- Viktoriia Savchenko
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Victor Ekholm
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Iulia Emilia Brumboiu
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Patrick Norman
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Annette Pietzsch
- Institute for Methods and Instrumentation in Synchrotron Radiation Research PS-ISRR, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Alexander Föhlisch
- Institute for Methods and Instrumentation in Synchrotron Radiation Research PS-ISRR, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - Jan-Erik Rubensson
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Johan Gråsjö
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Olle Björneholm
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Conny Såthe
- MAX IV Laboratory, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
| | - Minjie Dong
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden
| | - Thorsten Schmitt
- Swiss Light Source, Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Daniel McNally
- Swiss Light Source, Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Xingye Lu
- Swiss Light Source, Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Pavel Krasnov
- International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Sergey P Polyutov
- International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Faris Gel'mukhanov
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Michael Odelius
- Department of Physics, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden
| | - Victor Kimberg
- Department of Theoretical Chemistry and Biology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| |
Collapse
|
5
|
Lyu L, Ohnuma Y, Shigemoto Y, Hanada T, Fukada T, Akiyama H, Terasaki N, Horiuchi S. Toughness and Durability of Interfaces in Dissimilar Adhesive Joints of Aluminum and Carbon-Fiber-Reinforced Thermoplastics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:14046-14057. [PMID: 33164518 DOI: 10.1021/acs.langmuir.0c02628] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The toughness and the durability under a high humidity condition of the interfaces in dissimilar adhesive joints of carbon-fiber-reinforced thermoplastic with a polyamide-6 matrix and Al alloy were evaluated by two test methods, in which a tensile opening load was applied to the specimens to cleave the interfaces apart in two different ways. In the double cantilever beam (DCB) test, the specimens were continuously pulled apart at a constant velocity, while in the wedge test, the specimens are pulled apart at a constant displacement. The crack growth along the interface in the DCB test was dynamically monitored with the assistance of mechanoluminescence for the accurate detection of the phenomena at the crack tip. The wedge test was employed for the evaluation of the durability of the interfaces under high humidity conditions. It was found that the adhesive joints were failed by various failure modes depending on the surface pretreatment and environmental conditions. Throughout the work, discussion was made concerned with the interfacial structures and the adhesion mechanism of dissimilar adhesive joints.
Collapse
Affiliation(s)
- Lingyun Lyu
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
- Innovative Structural Materials Association (ISMA), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yoshino Ohnuma
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yuri Shigemoto
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
- Innovative Structural Materials Association (ISMA), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Takeshi Hanada
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Tamaki Fukada
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
- Innovative Structural Materials Association (ISMA), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Haruhisa Akiyama
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Nao Terasaki
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
- Sensing System Research Center (SSRC), National Institute of Advanced Industrial Science and Technology (AIST), 807-1 Shuku-machi, Tosu, Saga 841-0052, Japan
| | - Shin Horiuchi
- Research Laboratory for Adhesion and Interfacial Phenomena (AIRL), Nanomaterials Research Institute, National Institute of Advance Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| |
Collapse
|
6
|
Moll CJ, Meister K, Versluis J, Bakker HJ. Freezing of Aqueous Carboxylic Acid Solutions on Ice. J Phys Chem B 2020; 124:5201-5208. [PMID: 32414235 PMCID: PMC7322724 DOI: 10.1021/acs.jpcb.9b10462] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
We study the properties of acetic
acid and propionic acid solutions
at the surface of monocrystalline ice with surface-specific vibrational
sum-frequency generation (VSFG) and heterodyne-detected vibrational
sum-frequency generation spectroscopy (HD-VSFG). When we decrease
the temperature toward the eutectic point of the acid solutions, we
observe the formation of a freeze concentrated solution (FCS) of the
carboxylic acids that is brought about by a freeze-induced phase separation
(FIPS). The freeze concentrated solution freezes on top of the ice
surface as we cool the system below the eutectic point. We find that
for freeze concentrated acetic acid solutions the freezing causes
a strong decrease of the VSFG signal, while for propionic acid an
increase and a blue-shift are observed. This different behavior points
at a distinct difference in molecular-scale behavior when cooling
below the eutectic point. We find that cooling of the propionic acid
solution below the eutectic point leads to the formation of hydrogen-bonded
dimers with an opposite alignment of the carboxylic acid O–H
groups.
Collapse
Affiliation(s)
- Carolyn J Moll
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands
| | - Konrad Meister
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands.,Max-Planck Institute for Polymer Research, Ackermannweg 10, Mainz D 55128, Germany.,University of Alaska Southeast, Juneau, Alaska 99801, United States
| | - Jan Versluis
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands
| | - Huib J Bakker
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands
| |
Collapse
|
7
|
Hou J, Sun G, Liu J, Gao X, Zhang X, Lu Z. Liquid/Vapor Interface of Dimethyl Carbonate-Methanol Binary Mixtures Investigated by Sum Frequency Generation Vibrational Spectroscopy and Molecular Dynamics Simulation. J Phys Chem B 2020; 124:4211-4221. [PMID: 32338908 DOI: 10.1021/acs.jpcb.0c01566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the present work, the dimethyl carbonate (DMC)-methanol binary mixture was used as a benchmark system to study the molecular structures of the liquid/vapor interface of organic-organic mixtures by sum frequency generation vibrational spectroscopy (SFG-VS) and molecular dynamics (MD) simulations. It was discovered that both the methanol and DMC molecules are anisotropically oriented at the surface, yielding strong SFG-VS signals in the C-H stretching frequency range for both molecules. The detailed analyses of the spectroscopic and MD data reveal that the increase of the methanol bulk concentrations reduces the orientational order of the methyl groups for both the interfacial DMC and methanol molecules but does not significantly affect the orientations of the carbonyl group in DMC. Moreover, no obvious correlations were found between the room-temperature orientations of the surface molecules and the azeotropic mole fraction. The present work paves the road for future investigations on the molecular structures of the liquid/vapor interfaces of other organic-organic mixtures, especially those that are important in industrial separations.
Collapse
Affiliation(s)
- Jian Hou
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guanlun Sun
- School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Jianchuan Liu
- Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xin Gao
- School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Xianyi Zhang
- Anhui Province Key Laboratory of Optoelectronic Material Science and Technology, School of Physics and Electronic Information, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Zhou Lu
- Anhui Province Key Laboratory of Optoelectronic Material Science and Technology, School of Physics and Electronic Information, Anhui Normal University, Wuhu, Anhui 241002, China
| |
Collapse
|
8
|
Niu K, Marcus RA. Sum frequency generation, calculation of absolute intensities, comparison with experiments, and two-field relaxation-based derivation. Proc Natl Acad Sci U S A 2020; 117:2805-2814. [PMID: 31996478 PMCID: PMC7022212 DOI: 10.1073/pnas.1906243117] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The experimental sum frequency generation (SFG) spectrum is the response to an infrared pulse and a visible pulse and is a highly surface-sensitive technique. We treat the surface dangling OH bonds at the air/water interface and focus on the absolute SFG intensities for the resonant terms, a focus that permits insight into the consequences of some approximations. For the polarization combinations, the calculated linewidths for the water interface dangling OH SFG band at 3,700 [Formula: see text] are, as usual, too large, because of the customary neglect of motional narrowing. The integrated spectrum is used to circumvent this problem and justified here using a Kubo-like formalism and theoretical integrated band intensities rather than peak intensities. Only relative SFG intensities are usually reported. The absolute integrated SFG intensities for three polarization combinations for sum frequency, visible, and infrared beams are computed. We use molecular dynamics and the dipole and the polarizability matrix elements obtained from infrared and Raman studies of [Formula: see text]O vapor. The theoretical expressions for two of the absolute susceptibilities contain only a single term and agree with experiment to about a factor of 1.3, with no adjustable parameters. The Fresnel factors are included in that comparison. One of the susceptibilities contains instead four positive and negative terms and agrees less well. The expression for the SFG correlation function is normally derived from a statistical mechanical formulation using a time-evolving density matrix. We show how a derivation based on a two-field relaxation leads to the same final result.
Collapse
Affiliation(s)
- Kai Niu
- School of Science, Tianjin University of Technology and Education, Hexi, Tianjin 300222, People's Republic of China
- Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125
| | - Rudolph A Marcus
- Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125
| |
Collapse
|
9
|
Tyrode E, Sengupta S, Sthoer A. Identifying Eigen-like hydrated protons at negatively charged interfaces. Nat Commun 2020; 11:493. [PMID: 31980619 PMCID: PMC6981112 DOI: 10.1038/s41467-020-14370-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 01/06/2020] [Indexed: 11/24/2022] Open
Abstract
Despite the importance of the hydrogen ion in a wide range of biological, chemical, and physical processes, its molecular structure in solution remains lively debated. Progress has been primarily hampered by the extreme diffuse nature of the vibrational signatures of hydrated protons in bulk solution. Using the inherently surface-specific vibrational sum frequency spectroscopy technique, we show that at selected negatively charged interfaces, a resolved spectral feature directly linked to the H3O+ core in an Eigen-like species can be readily identified in a biologically compatible pH range. Centered at ~2540 cm−1, the band is seen to shift to ~1875 cm−1 when forming D3O+ upon isotopic substitution. The results offer the possibility of tracking and understanding from a molecular perspective the behavior of hydrated protons at charged interfaces. Hydrated protons are always present in aqueous solution, but their molecular structure remains under debate. Here the authors use vibrational sum frequency spectroscopy to show that at negatively charged liquid–vapor interfaces, protons adopt a specific configuration characteristic of Eigen-like species.
Collapse
Affiliation(s)
- Eric Tyrode
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044, Stockholm, Sweden.
| | - Sanghamitra Sengupta
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044, Stockholm, Sweden
| | - Adrien Sthoer
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044, Stockholm, Sweden
| |
Collapse
|
10
|
Watanabe S, Pilkington GA, Oleshkevych A, Pedraz P, Radiom M, Welbourn R, Glavatskih S, Rutland MW. Interfacial structuring of non-halogenated imidazolium ionic liquids at charged surfaces: effect of alkyl chain length. Phys Chem Chem Phys 2020; 22:8450-8460. [DOI: 10.1039/d0cp00360c] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Control of the interfacial structures of ionic liquids (ILs) at charged interfaces is important to many of their applications, including in energy storage solutions, sensors and advanced lubrication technologies utilising electric fields.
Collapse
Affiliation(s)
- Seiya Watanabe
- Division of Surface and Corrosion Science
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
| | - Georgia A. Pilkington
- Division of Surface and Corrosion Science
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
| | - Anna Oleshkevych
- Division of Surface and Corrosion Science
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
| | - Patricia Pedraz
- Division of Surface and Corrosion Science
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
| | - Milad Radiom
- Division of Surface and Corrosion Science
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
| | - Rebecca Welbourn
- ISIS Neutron & Muon Source
- Rutherford Appleton Laboratory
- STFC
- Didcot
- UK
| | - Sergei Glavatskih
- System and Component Design
- Department of Machine Design
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
- Sweden
| | - Mark W. Rutland
- Division of Surface and Corrosion Science
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
| |
Collapse
|
11
|
Sthoer A, Hladílková J, Lund M, Tyrode E. Molecular insight into carboxylic acid-alkali metal cations interactions: reversed affinities and ion-pair formation revealed by non-linear optics and simulations. Phys Chem Chem Phys 2019; 21:11329-11344. [PMID: 31107479 DOI: 10.1039/c9cp00398c] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Specific interactions between the carboxylic acid moiety and the monovalent salts CsCl, NaCl, and LiCl, have been investigated in Langmuir monolayers using vibrational sum frequency spectroscopy (VSFS) and complemented with coarse grained and all-atom molecular dynamics simulations. By exploiting VSFS's intrinsic surface specificity, an emphasis was made on targeting headgroup vibrations of both its charged and uncharged forms as well as water molecules in the interfacial layer. The degree of deprotonation of the monolayer as a function of cation concentration and pH was experimentally determined and theoretically rationalized. Starting from 100 mM, the surface charge was overestimated by the Gouy-Chapman model and varied depending on the identity of the cation, highlighting the appearance of ion specific effects. Agreement could be found using a modified Poisson-Boltzmann model that takes into account steric effects, with a fitted effective ion-size compatible with the hydrated ion diameters. The relative affinity of the cations to the carboxylic acid moiety was pH dependent: at pH 4.5 they arranged in the order Cs+ > Na+ > Li+, but fully reversed (Li+ > Na+ > Cs+) at pH 9. Simulations yielded microscopic insight into the origin of this behavior, with the cations showing contrasting interaction preferences for either the uncharged carboxylic acid or the charged carboxylate. Sum frequency spectra also provided evidence that all cations remained hydrated when interacting with the charged headgroup, forming solvent-separated or solvent-shared ion pairs. However, for the specific case of 1 M Li+ at pH 9, contact ion pairs were formed. Finally, the remarkable effect of trace metal multivalent cations in the interpretation of experiments is briefly discussed. The results provide exciting new insights into the complex interactions of alkali metal cations with the biophysically relevant carboxylic acid moiety.
Collapse
Affiliation(s)
- Adrien Sthoer
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
| | - Jana Hladílková
- Division of Theoretical Chemistry, Lund University, P.O.B. 124, SE-22100 Lund, Sweden
| | - Mikael Lund
- Division of Theoretical Chemistry, Lund University, P.O.B. 124, SE-22100 Lund, Sweden
| | - Eric Tyrode
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
| |
Collapse
|
12
|
Eugene AJ, Pillar-Little EA, Colussi AJ, Guzman MI. Enhanced Acidity of Acetic and Pyruvic Acids on the Surface of Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9307-9313. [PMID: 29975541 DOI: 10.1021/acs.langmuir.8b01606] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Understanding the acid-base behavior of carboxylic acids on aqueous interfaces is a fundamental issue in nature. Surface processes involving carboxylic acids such as acetic and pyruvic acids play roles in (1) the transport of nutrients through cell membranes, (2) the cycling of metabolites relevant to the origin of life, and (3) the photooxidative processing of biogenic and anthropogenic emissions in aerosols and atmospheric waters. Here, we report that 50% of gaseous acetic acid and pyruvic acid molecules transfer a proton to the surface of water at pH 2.8 and 1.8 units lower than their respective acidity constants p Ka = 4.6 and 2.4 in bulk water. These findings provide key insights into the relative Bronsted acidities of common carboxylic acids versus interfacial water. In addition, the work estimates the reactive uptake coefficient of gaseous pyruvic acid by water to be γPA = 0.06. This work is useful to interpret the interfacial behavior of pyruvic acid under low water activity conditions, typically found in haze aerosols, clouds, and fog waters.
Collapse
Affiliation(s)
- Alexis J Eugene
- Department of Chemistry , University of Kentucky , Lexington , Kentucky 40506 , United States
| | | | - Agustín J Colussi
- Department of Environmental Science & Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Marcelo I Guzman
- Department of Chemistry , University of Kentucky , Lexington , Kentucky 40506 , United States
| |
Collapse
|
13
|
Niga P, Hansson-Mille PM, Swerin A, Claesson PM, Schoelkopf J, Gane PAC, Bergendal E, Tummino A, Campbell RA, Magnus Johnson C. Interactions between model cell membranes and the neuroactive drug propofol. J Colloid Interface Sci 2018; 526:230-243. [PMID: 29734090 DOI: 10.1016/j.jcis.2018.03.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 03/12/2018] [Accepted: 03/14/2018] [Indexed: 12/13/2022]
Abstract
Vibrational sum frequency spectroscopy (VSFS) complemented by surface pressure isotherm and neutron reflectometry (NR) experiments were employed to investigate the interactions between propofol, a small amphiphilic molecule that currently is the most common general anaesthetic drug, and phospholipid monolayers. A series of biologically relevant saturated phospholipids of varying chain length from C18 to C14 were spread on either pure water or propofol (2,6-bis(1-methylethyl)phenol) solution in a Langmuir trough, and the change in the molecular structure of the film, induced by the interaction with propofol, was studied with respect to the surface pressure. The results from the surface pressure isotherm experiments revealed that propofol, as long as it remains at the interface, enhances the fluidity of the phospholipid monolayer. The VSF spectra demonstrate that for each phospholipid the amount of propofol in the monolayer region decreases with increasing surface pressure. Such squeeze out is in contrast to the enhanced interactions that can be exhibited by more complex amphiphilic molecules such as peptides. At surface pressures of 22-25 mN m-1, which are relevant for biological cell membranes, most of the propofol has been expelled from the monolayer, especially in the case of the C16 and C18 phospholipids that adopt a liquid condensed phase packing of its alkyl tails. At lower surface pressures of 5 mN m-1, the effect of propofol on the structure of the alkyl tails is enhanced when the phospholipids are present in a liquid expanded phase. Specifically, for the C16 phospholipid, NR data reveal that propofol is located exclusively in the head group region, which is rationalized in the context of previous studies. The results imply a non-homogeneous distribution of propofol in the plane of real cell membranes, which is an inference that requires urgent testing and may help to explain why such low concentration of the drug are required to induce general anaesthesia.
Collapse
Affiliation(s)
- Petru Niga
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden.
| | - Petra M Hansson-Mille
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden
| | - Agne Swerin
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden; KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden
| | - Per M Claesson
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden; KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden
| | | | - Patrick A C Gane
- Omya International AG, Baslerstrasse 42, CH-4665 Oftringen, Switzerland; Aalto University, School of Chemical Engineering, Department of Bioproducts and Biosystems, P.O. Box 16300, FI-00076 Aalto, Helsinki, Finland
| | - Erik Bergendal
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden
| | - Andrea Tummino
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble, France; Eötvös Loránd University, Budapest 112, P.O. Box 32, H-1518, Hungary
| | | | - C Magnus Johnson
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden.
| |
Collapse
|
14
|
Interaction between water and acetic acid-sodium halide aerosol: A molecular dynamics study. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2016.12.082] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
15
|
Lam RK, Smith JW, Rizzuto AM, Karslıoğlu O, Bluhm H, Saykally RJ. Reversed interfacial fractionation of carbonate and bicarbonate evidenced by X-ray photoemission spectroscopy. J Chem Phys 2017. [DOI: 10.1063/1.4977046] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Royce K. Lam
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Jacob W. Smith
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Anthony M. Rizzuto
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Osman Karslıoğlu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Hendrik Bluhm
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Richard J. Saykally
- Department of Chemistry, University of California, Berkeley, California 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| |
Collapse
|
16
|
Copeland C, Menon O, Majumdar D, Roszak S, Leszczynski J. Understanding the influence of low-frequency vibrations on the hydrogen bonds of acetic acid and acetamide dimers. Phys Chem Chem Phys 2017; 19:24866-24878. [DOI: 10.1039/c7cp04224h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low-frequency vibrations coupled to high-frequency modes are known to influence the hydrogen bond strengths in a weakly interacting dimer.
Collapse
Affiliation(s)
- Christopher Copeland
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Jackson State University
- Jackson
- USA
| | - Omkaran Menon
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Jackson State University
- Jackson
- USA
| | - D. Majumdar
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Jackson State University
- Jackson
- USA
| | - Szczepan Roszak
- Advanced Materials Engineering and Modelling Group
- Faculty of Chemistry
- Wroclaw University of Science and Technology
- 50-370 Wroclaw
- Poland
| | - Jerzy Leszczynski
- Interdisciplinary Center for Nanotoxicity
- Department of Chemistry
- Jackson State University
- Jackson
- USA
| |
Collapse
|
17
|
Koike M, Asakura Y, Sugihara M, Kuroda Y, Tsuzura H, Wada H, Shimojima A, Kuroda K. Topotactic conversion of layered silicate RUB-15 to silica sodalite through interlayer condensation in N-methylformamide. Dalton Trans 2017; 46:10232-10239. [DOI: 10.1039/c7dt01287j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Layered silicate RUB-15 was topotactically converted to silica sodalite through interlayer condensation by refluxing in N-methylformamide.
Collapse
Affiliation(s)
- Masakazu Koike
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Yusuke Asakura
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Megumi Sugihara
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Yoshiyuki Kuroda
- Waseda Institute for Advanced Study
- Waseda University
- Tokyo 169-8050
- Japan
| | - Hidehiro Tsuzura
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Hiroaki Wada
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Atsushi Shimojima
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Kazuyuki Kuroda
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| |
Collapse
|
18
|
Radola B, Picaud S, Vardanega D, Jedlovszky P. Molecular Dynamics Simulations of the Interaction between Water Molecules and Aggregates of Acetic or Propionic Acid Molecules. J Phys Chem B 2015; 119:15662-74. [DOI: 10.1021/acs.jpcb.5b08110] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bastien Radola
- Institut
UTINAM - UMR 6213, CNRS, Univ. Bourgogne Franche-Comté, F-25000 Besançon Cedex, France
| | - Sylvain Picaud
- Institut
UTINAM - UMR 6213, CNRS, Univ. Bourgogne Franche-Comté, F-25000 Besançon Cedex, France
| | - Delphine Vardanega
- Institut
UTINAM - UMR 6213, CNRS, Univ. Bourgogne Franche-Comté, F-25000 Besançon Cedex, France
- PhLAM - UMR8523,
CNRS, Univ. Lille 1, F-59655 Villeneuve d’Ascq, France
| | - Pál Jedlovszky
- Laboratory
of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter
stny, 1/a, H-1117 Budapest, Hungary
- HAS Research Group of Technical Analytical Chemistry, Szt. Gellért tér 4, H-1111 Budapest, Hungary
- EKF Department of Chemistry, Eszterházy tér 1, H-3300 Eger, Hungary
| |
Collapse
|
19
|
Valley NA, Richmond GL. Solvation Station: Microsolvation for Modeling Vibrational Sum-Frequency Spectra of Acids at Aqueous Interfaces. J Chem Theory Comput 2015; 11:4780-90. [DOI: 10.1021/acs.jctc.5b00484] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicholas A. Valley
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | | |
Collapse
|
20
|
Gustafsson E, Hedberg J, Larsson PA, Wågberg L, Johnson CM. Vibrational Sum Frequency Spectroscopy on Polyelectrolyte Multilayers: Effect of Molecular Surface Structure on Macroscopic Wetting Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4435-4442. [PMID: 25859709 DOI: 10.1021/la5046207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Adsorption of a single layer of molecules on a surface, or even a reorientation of already present molecules, can significantly affect the surface properties of a material. In this study, vibrational sum frequency spectroscopy (VSFS) has been used to study the change in molecular structure at the solid-air interface following thermal curing of polyelectrolyte multilayers of poly(allylamine hydrochloride) and poly(acrylic acid). Significant changes in the VSF spectra were observed after curing. These changes were accompanied by a distinct increase in the static water contact angle, showing how the properties of the layer-by-layer molecular structure are controlled not just by the polyelectrolyte in the outermost layer but ultimately by the orientation of the chemical constituents in the outermost layers.
Collapse
Affiliation(s)
- Emil Gustafsson
- †KTH Royal Institute of Technology, School of Chemical Science and Engineering, Wallenberg Wood Science Center, Teknikringen 42, SE-100 44 Stockholm, Sweden
- ‡KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Jonas Hedberg
- §KTH Royal Institute of Technology, School of Chemical Science and Engineering, Division of Surface and Corrosion Science, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Per A Larsson
- ‡KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - Lars Wågberg
- †KTH Royal Institute of Technology, School of Chemical Science and Engineering, Wallenberg Wood Science Center, Teknikringen 42, SE-100 44 Stockholm, Sweden
- ‡KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Fibre and Polymer Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
| | - C Magnus Johnson
- §KTH Royal Institute of Technology, School of Chemical Science and Engineering, Division of Surface and Corrosion Science, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| |
Collapse
|
21
|
Advanced experimental methods toward understanding biophysicochemical interactions of interfacial biomolecules by using sum frequency generation vibrational spectroscopy. Sci China Chem 2014. [DOI: 10.1007/s11426-014-5233-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
22
|
Aggregation of inkjet ink components by Ca and Mg ions in relation to colorant pigment distribution in paper. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
23
|
Valley NA, Blower PG, Wood SR, Plath KL, McWilliams LE, Richmond GL. Doubling Down: Delving into the Details of Diacid Adsorption at Aqueous Surfaces. J Phys Chem A 2014; 118:4778-89. [DOI: 10.1021/jp501498h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Nicholas A. Valley
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Patrick G. Blower
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Suzannah R. Wood
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Kathryn L. Plath
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Laura E. McWilliams
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Geraldine L. Richmond
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| |
Collapse
|
24
|
Johnson CM, Baldelli S. Vibrational Sum Frequency Spectroscopy Studies of the Influence of Solutes and Phospholipids at Vapor/Water Interfaces Relevant to Biological and Environmental Systems. Chem Rev 2014; 114:8416-46. [DOI: 10.1021/cr4004902] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- C. Magnus Johnson
- Division of Surface and Corrosion
Science, Royal Institute of Technology (KTH), Drottning Kristinas Väg 51, SE-100 44 Stockholm, Sweden
| | - Steven Baldelli
- Department
of Chemistry, University of Houston, Texas 77204-5003, United States
| |
Collapse
|
25
|
Liljeblad JFD, Tyrode E, Thormann E, Dublanchet AC, Luengo G, Magnus Johnson C, Rutland MW. Self-assembly of long chain fatty acids: effect of a methyl branch. Phys Chem Chem Phys 2014; 16:17869-82. [DOI: 10.1039/c4cp00512k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The morphology and molecular conformation of monolayers of straight chain and methyl-branched fatty acids have been investigated by VSFS and AFM, revealing domains in the latter case, due to inverse micellar packing constraints.
Collapse
Affiliation(s)
- Jonathan F. D. Liljeblad
- School of Chemistry
- Division of Surface and Corrosion Science
- KTH Royal Institute of Technology
- SE-100 44 Stockholm, Sweden
| | - Eric Tyrode
- School of Chemistry
- Division of Surface and Corrosion Science
- KTH Royal Institute of Technology
- SE-100 44 Stockholm, Sweden
| | - Esben Thormann
- School of Chemistry
- Division of Surface and Corrosion Science
- KTH Royal Institute of Technology
- SE-100 44 Stockholm, Sweden
| | | | | | - C. Magnus Johnson
- School of Chemistry
- Division of Surface and Corrosion Science
- KTH Royal Institute of Technology
- SE-100 44 Stockholm, Sweden
| | - Mark W. Rutland
- School of Chemistry
- Division of Surface and Corrosion Science
- KTH Royal Institute of Technology
- SE-100 44 Stockholm, Sweden
- SP Technical Research Institute of Sweden
| |
Collapse
|
26
|
Chen D, Han X, Jin W, Du Y, Xu P. In situ Raman monitoring of [2+2] cycloaddition of pyridine substituted olefins induced by visible laser. Chem Commun (Camb) 2014; 50:15631-3. [DOI: 10.1039/c4cc06808d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible laser induced [2+2] cycloaddition of solid-state pyridine substituted olefins into cyclobutane can be monitored by an in situ Raman technique.
Collapse
Affiliation(s)
- Dengtai Chen
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001, China
| | - Xijiang Han
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001, China
| | - Wen Jin
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001, China
| | - Yunchen Du
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001, China
| | - Ping Xu
- Department of Chemistry
- Harbin Institute of Technology
- Harbin 150001, China
| |
Collapse
|
27
|
Blower PG, Ota ST, Valley NA, Wood SR, Richmond GL. Sink or Surf: Atmospheric Implications for Succinic Acid at Aqueous Surfaces. J Phys Chem A 2013; 117:7887-903. [DOI: 10.1021/jp405067y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Patrick G. Blower
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Stephanie T. Ota
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Nicholas A. Valley
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | - Suzannah R. Wood
- Department
of Chemistry, University of Oregon, Eugene, Oregon 97403, United States
| | | |
Collapse
|
28
|
Xiao R, Diaz-Rivera D, He Z, Weavers LK. Using pulsed wave ultrasound to evaluate the suitability of hydroxyl radical scavengers in sonochemical systems. ULTRASONICS SONOCHEMISTRY 2013; 20:990-996. [PMID: 23238044 DOI: 10.1016/j.ultsonch.2012.11.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 10/27/2012] [Accepted: 11/12/2012] [Indexed: 06/01/2023]
Abstract
Hydroxyl radical (()OH) scavengers are commonly used in sonochemistry to probe the site and nature of reaction in aqueous cavitational systems. Using pulsed wave (PW) ultrasound with comparative sonochemistry we evaluated the performance of ()OH scavengers (i.e., formic acid, carbonic acid, terephthalic acid/terephthalate, iodide, methanesulfonate, benzenesulfonate, and acetic acid/acetate) in a sonochemical system to determine which ()OH scavengers react only in bulk solution and which ()OH scavengers interact with cavitation bubbles. The ability of each scavenger to interact with cavitation bubbles was assessed by comparing the pulse enhancement (PE) of 10μM of a probe compound, carbamazepine (CBZ), in the presence and absence of a scavenger. Based on PE results, acetic acid/acetate appears to scavenge ()OH in bulk solution, and not interact with cavitation bubbles. Methanesulfonate acts as reaction promoter, increasing rather than inhibiting the degradation of CBZ. For formic acid, carbonic acid, terephthalic acid/terephthalate, benzenesulfonate, and iodide, the PE was significantly decreased compared to in the absence of the scavenger. These scavengers not only quench ()OH in bulk solution but also affect the cavity interface. The robustness of acetic acid/acetate as a bulk ()OH scavenger was validated for pH values between 3.5 and 8.9 and acetic acid/acetate concentrations from 0.5 to 0.1M.
Collapse
Affiliation(s)
- Ruiyang Xiao
- Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, USA
| | | | | | | |
Collapse
|
29
|
Blower PG, Shamay E, Kringle L, Ota ST, Richmond GL. Surface Behavior of Malonic Acid Adsorption at the Air/Water Interface. J Phys Chem A 2013; 117:2529-42. [DOI: 10.1021/jp310851j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Patrick G. Blower
- Department
of Chemistry, 1253 University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Eric Shamay
- Department
of Chemistry, 1253 University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Loni Kringle
- Department
of Chemistry, 1253 University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Stephanie T. Ota
- Department
of Chemistry, 1253 University of Oregon, Eugene, Oregon 97403-1253, United States
| | - Geraldine L. Richmond
- Department
of Chemistry, 1253 University of Oregon, Eugene, Oregon 97403-1253, United States
| |
Collapse
|
30
|
Zhang C, Chen Z. Quantitative molecular level understanding of ethoxysilane at poly(dimethylsiloxane)/polymer interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:610-619. [PMID: 23241016 DOI: 10.1021/la3041727] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Because of the wide applications of silicone adhesives, it is important to study adhesion mechanisms of silicone elastomers to polymers. Adhesion properties are believed to be directly related to the molecular structures at the adhesive/substrate interfaces. To improve adhesion, adhesion promoters such as silanes are commonly used to modify the interfacial structures. It is difficult to study buried interfacial molecular structures between two materials in situ using conventional analytical techniques. In this study, sum frequency generation (SFG) vibrational spectroscopy was used to investigate molecular structures at buried silicone/poly(ethylene terephthalate) (PET) interfaces. Environmental-friendly epoxysilanes including (3-glycidoxypropyl)triethoxysilane (γ-GPES), (3-glycidoxypropyl)methyldiethoxysilane (γ-GPDES), and (3-glycidoxypropyl)dimethylethoxysilane (γ-GPDMES) and their mixtures with methylvinylsiloxanol (MVS) were used as adhesion promoters to modify silicone adhesion properties to PET. Various PET/silane, PET/uncured silicone, and PET/cured silicone interfaces were examined. The interfacial structures deduced from SFG spectra were correlated to adhesion testing results. It was found that silane headgroup order at the polymer interfaces is an important factor for improving adhesion. The decrease of silane headgroup order due to chemical reaction and disordering of such groups at the polymer interfaces can be associated with improved adhesion. The molecular level understanding on polymer/adhesive interfacial structures helps to design and develop adhesion promoters and polymer adhesives with improved performance.
Collapse
Affiliation(s)
- Chi Zhang
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | | |
Collapse
|
31
|
Duffey KC, Shih O, Wong NL, Drisdell WS, Saykally RJ, Cohen RC. Evaporation kinetics of aqueous acetic acid droplets: effects of soluble organic aerosol components on the mechanism of water evaporation. Phys Chem Chem Phys 2013; 15:11634-9. [DOI: 10.1039/c3cp51148k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
32
|
Zhang C, Myers J, Chen Z. Elucidation of molecular structures at buried polymer interfaces and biological interfaces using sum frequency generation vibrational spectroscopy. SOFT MATTER 2013; 9:4738-4761. [PMID: 23710244 PMCID: PMC3661304 DOI: 10.1039/c3sm27710k] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Sum frequency generation (SFG) vibrational spectroscopy has been developed into an important technique to study surfaces and interfaces. It can probe buried interfaces in situ and provide molecular level structural information such as the presence of various chemical moieties, quantitative molecular functional group orientation, and time dependent kinetics or dynamics at such interfaces. This paper focuses on these three most important advantages of SFG and reviews some of the recent progress in SFG studies on interfaces related to polymer materials and biomolecules. The results discussed here demonstrate that SFG can provide important molecular structural information of buried interfaces in situ and in real time, which is difficult to obtain by other surface sensitive analytical techniques.
Collapse
Affiliation(s)
- Chi Zhang
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | | | | |
Collapse
|
33
|
Verreault D, Hua W, Allen HC. From Conventional to Phase-Sensitive Vibrational Sum Frequency Generation Spectroscopy: Probing Water Organization at Aqueous Interfaces. J Phys Chem Lett 2012; 3:3012-3028. [PMID: 26292243 DOI: 10.1021/jz301179g] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Elucidation of water organization at aqueous interfaces has remained a challenging problem. Conventional vibrational sum frequency generation (VSFG) spectroscopy and its most recent extension, phase-sensitive VSFG (PS-VSFG), have emerged as powerful experimental methods for unraveling structural information at various aqueous interfaces. In this Perspective, we briefly describe the two possible VSFG detection modes, and we point out features that make these methods highly suited to address questions about water organization at air/aqueous interfaces. Several important aqueous interfacial systems are discussed to illustrate the versatility of these methods. Remaining challenges and exciting prospective directions are also presented.
Collapse
Affiliation(s)
- Dominique Verreault
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Wei Hua
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Heather C Allen
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| |
Collapse
|
34
|
Jubb AM, Hua W, Allen HC. Organization of water and atmospherically relevant ions and solutes: vibrational sum frequency spectroscopy at the vapor/liquid and liquid/solid interfaces. Acc Chem Res 2012; 45:110-9. [PMID: 22066822 DOI: 10.1021/ar200152v] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The nature of water's hydrogen-bonding network is a vital influence on the chemistry that occurs at interfaces, but a complete understanding of interfacial water has proven elusive. Even-order nonlinear optical spectroscopies, such as vibrational sum frequency generation (VSFG) spectroscopy and heterodyne detected phase-sensitive sum frequency generation (PS-SFG) spectroscopy, are inherently surface specific. With the advent of advances in these spectroscopic techniques, researchers can now explore many long-standing questions about the dynamics and structures present at the vapor-water and water-solid interfaces. Of special interest to the atmospheric chemistry community is the accommodation of ions and solutes by water's hydrogen-bonding network. A better understanding of how ions and solutes behave in hydrogen-bonded water has afforded a fresh perspective of aqueous aerosols, because the interactions involved therein drive phenomena such as the hydrolysis of atmospheric chemical species. In this Account, we present work from our laboratory focusing on applying VSFG and the recently developed PS-SFG techniques to probe the perturbation of water's hydrogen-bonding network at the vapor-water interface by a variety of ions and solutes. We also present very recent results from our laboratory on the direct observation of the adsorption of ions at the water-CaF(2) interface. We begin by discussing the influence of ions and solutes on interfacial water structure. Results for halide salts and the acid analogs on interfacial water structure are shown to be quite different, as would be expected from differences in surface tension measurements that have been known for a long time. Also examined are systems with the largely polarizable molecular anions nitrate (NO(3)(-)), sulfate (SO(4)(2-)), carbonate (CO(3)(2-)), and bicarbonate (HCO(3)(-)).These systems feature more complicated influences on interfacial water structure than halide-containing solutions; however, our conventional VSFG results for both nitrate and sulfate solutions are in agreement with recent PS-SFG results and molecular dynamics simulations. We also discuss recent PS-SFG work on carbonate and bicarbonate systems in which the accommodation of the bicarbonate ion at the vapor-water interface is in stark contrast to the carbonate results. Perturbation of interfacial water by solutes is examined for solutions of dimethyl sulfoxide and methylsulfonic acid. PS-SFG results for these systems are striking: they illustrate the dramatic changes that interfacial water molecules undergo in the presence of solutes that are not observed with conventional VSFG. Finally, we discuss direct sulfate ion adsorption for the aqueous sodium sulfate-CaF(2) interface, with the goal of elucidating water behavior at this surface.
Collapse
Affiliation(s)
- Aaron M. Jubb
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Wei Hua
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Heather C. Allen
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| |
Collapse
|
35
|
Laß K, Friedrichs G. Revealing structural properties of the marine nanolayer from vibrational sum frequency generation spectra. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jc006609] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
36
|
Niga P, Johnson CM, Frey JG, Rutland MW. Crown ethers at the aqueous solution–air interface. Part 2. Electrolyte effects, ethylene oxide hydration and temperature behaviour. Phys Chem Chem Phys 2011; 13:7939-47. [DOI: 10.1039/c0cp02144j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
37
|
Tang CY, Huang Z, Allen HC. Binding of Mg2+ and Ca2+ to Palmitic Acid and Deprotonation of the COOH Headgroup Studied by Vibrational Sum Frequency Generation Spectroscopy. J Phys Chem B 2010; 114:17068-76. [PMID: 21062085 DOI: 10.1021/jp105472e] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Cheng Y. Tang
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Zishuai Huang
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Heather C. Allen
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| |
Collapse
|
38
|
Pu L, Sun Y, Zhang Z. Hydrogen Bonding in Hydrates with one Acetic Acid Molecule. J Phys Chem A 2010; 114:10842-9. [DOI: 10.1021/jp103331a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liang Pu
- Separation Engineering Research Center of Nanjing University, Key Laboratory in Meso- & Microscopic Chemistry of Ministry of Education of China, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China, College of Science, Northwest A&F University, Shaanxi 712100, China, and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Yueming Sun
- Separation Engineering Research Center of Nanjing University, Key Laboratory in Meso- & Microscopic Chemistry of Ministry of Education of China, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China, College of Science, Northwest A&F University, Shaanxi 712100, China, and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Zhibing Zhang
- Separation Engineering Research Center of Nanjing University, Key Laboratory in Meso- & Microscopic Chemistry of Ministry of Education of China, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China, College of Science, Northwest A&F University, Shaanxi 712100, China, and School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| |
Collapse
|
39
|
Tyrode E, Niga P, Johnson M, Rutland MW. Molecular structure upon compression and stability toward oxidation of Langmuir films of unsaturated fatty acids: a vibrational sum frequency spectroscopy study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14024-14031. [PMID: 20666467 DOI: 10.1021/la102189z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Vibrational sum frequency spectroscopy (VSFS) has been used to determine the stability toward oxidation in air of a series of unsaturated fatty acids, measuring as a function of time the changes in the chemical structure and conformational order of films spread on a Langmuir trough. The fatty acids studied consisted of a 20-carbon backbone with increasing numbers of cis double bonds in the chain: 11c-eicosenoic acid (20:1 EA, omega-9), 11c,14c-eicosadienoic acid (20:2 EA, omega-6), and 11c,14c,17c-eicosatrienoic acid (20:3 EA, omega-3). Measurements at constant surface pressure show that double bonds are lost from the surface region and that drops in intensity of the vinyl CH stretch are detectable within a few minutes of spreading the monolayer. The results are consistent with the fatty acid peroxidation free radical mechanism. The sum frequency spectra also reveal that what remains on the surface is conformationally more disordered with a larger number of gauche defects. The oxidation kinetics are found to be strongly dependent on the packing density of the monolayer, being more stable at higher pressures. Oxidation can be avoided by purging the system in an inert atmosphere. Finally, the molecular structure upon compression was tracked in unoxidized monolayers. The results suggest that the packing and orientation of the double bond sections of all three unsaturated fatty acids show remarkable similarities, with the direction of the double bonds approximately parallel to each other irrespective of the number of unsaturations in the chain, with the 20:3 EA probably forming "iron-angle" structures. The possibility of unsaturated chains in a "hairpin" configuration is discarded for area per molecules smaller than approximately 50 A(2), which corresponds to the lowest surface pressure measured with VSFS.
Collapse
Affiliation(s)
- Eric Tyrode
- Division of Surface and Corrosion Science, Department of Chemistry, Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
| | | | | | | |
Collapse
|
40
|
|
41
|
Wakeham D, Niga P, Warr GG, Rutland MW, Atkin R. Nonionic surfactant adsorption at the ethylammonium nitrate surface: a neutron reflectivity and vibrational sum frequency spectroscopy study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8313-8318. [PMID: 20121047 DOI: 10.1021/la9047243] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The adsorbed layers of polyoxyethylene n-alkyl ether surfactants C(12)E(4), C(14)E(4), and C(16)E(4) at the EAN surface have a headgroup layer that is thin and compact (only approximately 30 vol % EAN). The headgroups do not adopt a preferred orientation and are disordered within the ethylene oxide layer. Alkyl tails contain a significant number of gauche defects indicating a high degree of conformational disorder. The thickness of the tail layer increases with increasing alkyl chain length, while the headgroup layer shows little change. Lowering the C(12)E(4) concentration from 1 to 0.1 wt % decreases the adsorbed amount, and the headgroup layer becomes thinner and less solvated, whereas C(14)E(4) and C(16)E(4) adsorbed layers are unaffected by dilution over the same concentration range. The C(16)E(4) layer thickness increases and area per molecule decreases on warming to 60 degrees C, but the adsorbed layer structures of C(12)E(4) and C(14)E(4) are unchanged. Both effects are attributed to surfactant solubility.
Collapse
Affiliation(s)
- Deborah Wakeham
- Centre for Organic Electronics, The University of Newcastle, Callaghan, NSW 2308, Australia
| | | | | | | | | |
Collapse
|
42
|
Niga P, Wakeham D, Nelson A, Warr GG, Rutland M, Atkin R. Structure of the ethylammonium nitrate surface: an X-ray reflectivity and vibrational sum frequency spectroscopy study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8282-8288. [PMID: 20302344 DOI: 10.1021/la904697g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
X-ray reflectivity and vibrational sum frequency spectroscopy are used to probe the structure of the ethylammonium nitrate (EAN)-air interface. X-ray reflectivity reveals that the EAN-air interface is structured and consists of alternating nonpolar and charged layers that extend 31 A into the bulk. Vibrational sum frequency spectroscopy reveals interfacial cations have their ethyl moieties oriented toward air, with the CH(3) C(3) axis positioned approximately 36.5 degrees from interface normal. This structure is invariant between 15 and 51 degrees C. On account of its molecular symmetry, the orientation of the nitrate anion cannot be determined with certainty.
Collapse
Affiliation(s)
- Petru Niga
- Department of Chemistry, Surface and Corrosion Science, Royal Institute of Technology, Drottning Kristinas Vag 51, SE-100 44 Stockholm, Sweden
| | | | | | | | | | | |
Collapse
|
43
|
Liljeblad JF, Bulone V, Tyrode E, Rutland MW, Johnson CM. Phospholipid monolayers probed by vibrational sum frequency spectroscopy: instability of unsaturated phospholipids. Biophys J 2010; 98:L50-2. [PMID: 20483309 PMCID: PMC2872474 DOI: 10.1016/j.bpj.2010.02.009] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Revised: 01/27/2010] [Accepted: 02/12/2010] [Indexed: 11/29/2022] Open
Abstract
The surface specific technique vibrational sum frequency spectroscopy has been applied to in situ studies of the degradation of Langmuir monolayers of 1,2-diacyl-phosphocholines with various degrees of unsaturation in the aliphatic chains. To monitor the degradation of the phospholipids, the time-dependent change of the monolayer area at constant surface pressure and the sum frequency intensity of the vinyl CH stretch at the carbon-carbon double bonds were measured. The data show a rapid degradation of monolayers of phospholipids carrying unsaturated aliphatic chains compared to the stable lipids carrying fully saturated chains when exposed to the ambient laboratory air. In addition, the degradation of the phospholipids can be inhibited by purging the ambient air with nitrogen. This instability may be attributed to spontaneous degradation by oxidation mediated by various reactive species in the air. To further elucidate the process of lipid oxidation in biological membranes artificial Langmuir monolayers probed by a surface specific spectroscopic technique as in this study can serve as a model system for studying the degradation/oxidation of cell membrane constituents.
Collapse
Affiliation(s)
- Jonathan F.D. Liljeblad
- School of Chemistry, Division of Surface and Corrosion Science, Royal Institute of Technology, Stockholm, Sweden
| | - Vincent Bulone
- School of Biotechnology, Division of Glycoscience, Royal Institute of Technology, Stockholm, Sweden
| | - Eric Tyrode
- School of Chemistry, Division of Surface and Corrosion Science, Royal Institute of Technology, Stockholm, Sweden
| | - Mark W. Rutland
- School of Chemistry, Division of Surface and Corrosion Science, Royal Institute of Technology, Stockholm, Sweden
- Institute for Surface Chemistry, Stockholm, Sweden
| | - C. Magnus Johnson
- School of Chemistry, Division of Surface and Corrosion Science, Royal Institute of Technology, Stockholm, Sweden
| |
Collapse
|
44
|
Pu L, Sun Y, Zhang Z. Hydrogen bonding of single acetic acid with water molecules in dilute aqueous solutions. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11426-009-0288-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
45
|
Tang CY, Allen HC. Ionic Binding of Na+ versus K+ to the Carboxylic Acid Headgroup of Palmitic Acid Monolayers Studied by Vibrational Sum Frequency Generation Spectroscopy. J Phys Chem A 2009; 113:7383-93. [PMID: 19453122 DOI: 10.1021/jp9000434] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cheng Y. Tang
- The Ohio State University, Department of Chemistry, 100 West 18th Avenue, Columbus, Ohio 43210
| | - Heather C. Allen
- The Ohio State University, Department of Chemistry, 100 West 18th Avenue, Columbus, Ohio 43210
| |
Collapse
|
46
|
Van Loon LL, Allen HC. Uptake and surface reaction of methanol by sulfuric acid solutions investigated by vibrational sum frequency generation and Raman spectroscopies. J Phys Chem A 2008; 112:7873-80. [PMID: 18671375 DOI: 10.1021/jp712134s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The uptake of methanol at the air-liquid interface of 0-96.5 wt % sulfuric acid (H2SO4) solutions has been observed directly using vibrational sum frequency generation (VSFG) spectroscopy. As the concentration of H2SO4 increases, the VSFG spectra reveal a surface reaction between methanol and H2SO4 to form methyl hydrogen sulfate. The surface is saturated with the methyl species after 15 min. The uptake of methyl species into the solutions by Raman spectroscopy was also observed and occurred on a much longer time scale. This suggests that uptake of methanol by sulfuric acid solutions is diffusion-limited.
Collapse
Affiliation(s)
- Lisa L Van Loon
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA
| | | |
Collapse
|
47
|
Ma G, Allen HC. DPPC Langmuir monolayer at the air-water interface: probing the tail and head groups by vibrational sum frequency generation spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:5341-9. [PMID: 16732662 DOI: 10.1021/la0535227] [Citation(s) in RCA: 221] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Dipalmitoylphosphatidylcholine (DPPC) is the predominant lipid component in lung surfactant. In this study, the Langmuir monolayer of deuterated dipalmitoylphosphatidylcholine (DPPC-d62) in the liquid-expanded (LE) phase and the liquid-condensed (LC) phase has been investigated at the air-water interface with broad bandwidth sum frequency generation (BBSFG) spectroscopy combined with a Langmuir film balance. Four moieties of the DPPC molecule are probed by BBSFG: the terminal methyl (CD3) groups of the tails, the methylene (CD2) groups of the tails, the choline methyls (CH3) in the headgroup, and the phosphate in the headgroup. BBSFG spectra of the four DPPC moieties provide information about chain conformation, chain orientation, headgroup orientation, and headgroup hydration. These results provide a comprehensive picture of the DPPC phase behavior at the air-water interface. In the LE phase, the DPPC hydrocarbon chains are conformationally disordered with a significant number of gauche configurations. In the LC phase, the hydrocarbon chains are in an all-trans conformation and are tilted from the surface normal by 25 degrees. In addition, the orientations of the tail terminal methyl groups are found to remain nearly unchanged with the variation of surface area. Qualitative analysis of the BBSFG spectra of the choline methyl groups suggests that these methyl groups are tilted but lie somewhat parallel to the surface plane in both the LE and LC phases. The dehydration of the phosphate headgroup due to the LE-LC phase transition is observed through the frequency blue shift of the phosphate symmetric stretch in the fingerprint region. In addition, implications for lung surfactant function from this work are discussed.
Collapse
Affiliation(s)
- Gang Ma
- Department of Chemistry, Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA
| | | |
Collapse
|
48
|
Abstract
The adsorption of acetic acid on a proton-ordered water ice surface is modeled using periodic plane-waves density-functional theory. The structures of acetic acid adsorbed as a monomer or oligomers, hydrated or not, are calculated through gradient optimization. The resulting quantum electronic density of states are compared to metastable impact electron spectroscopy (MIES) results and lead to selection of the most plausible structures of acetic acid on water ice. Hypotheses are formulated for the structure of the acid film growing on the ice surface including mainly cyclic dimers and hydrated forms. Adsorptions of single water molecules on acetic acid crystal surfaces are also studied after optimization of the acetic acid crystal bulk and surface structure. More comparisons with spectroscopic studies are proposed in the accompanying paper.
Collapse
Affiliation(s)
- A Allouche
- Physique des Interactions Ioniques et Moléculaires, Université de Provence and CNRS, Unité Mixte de Recherche N 6633, Campus de Saint Jérôme Service 242, 13397 Marseille Cedex 20, France.
| | | |
Collapse
|
49
|
Shen YR, Ostroverkhov V. Sum-Frequency Vibrational Spectroscopy on Water Interfaces: Polar Orientation of Water Molecules at Interfaces. Chem Rev 2006; 106:1140-54. [PMID: 16608175 DOI: 10.1021/cr040377d] [Citation(s) in RCA: 663] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuen Ron Shen
- Department of Physics, University of California, Berkeley, California 94720, USA.
| | | |
Collapse
|
50
|
Gan W, Wu D, Zhang Z, Feng RR, Wang HF. Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface. J Chem Phys 2006; 124:114705. [PMID: 16555908 DOI: 10.1063/1.2179794] [Citation(s) in RCA: 168] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Here we report a detailed study on spectroscopy, structure, and orientational distribution, as well as orientational motion, of water molecules at the air/water interface, investigated with sum frequency generation vibrational spectroscopy (SFG-VS). Quantitative polarization and experimental configuration analyses of the SFG data in different polarizations with four sets of experimental configurations can shed new light on our present understanding of the air/water interface. Firstly, we concluded that the orientational motion of the interfacial water molecules can only be in a limited angular range, instead of rapidly varying over a broad angular range in the vibrational relaxation time as suggested previously. Secondly, because different vibrational modes of different molecular species at the interface has different symmetry properties, polarization and symmetry analyses of the SFG-VS spectral features can help the assignment of the SFG-VS spectra peaks to different interfacial species. These analyses concluded that the narrow 3693 cm(-1) and broad 3550 cm(-1) peaks belong to C(infinityv) symmetry, while the broad 3250 and 3450 cm(-1) peaks belong to the symmetric stretching modes with C2v symmetry. Thus, the 3693 cm(-1) peak is assigned to the free OH, the 3550 cm(-1) peak is assigned to the singly hydrogen-bonded OH stretching mode, and the 3250 and 3450 cm(-1) peaks are assigned to interfacial water molecules as two hydrogen donors for hydrogen bonding (with C2v symmetry), respectively. Thirdly, analysis of the SFG-VS spectra concluded that the singly hydrogen-bonded water molecules at the air/water interface have their dipole vector directed almost parallel to the interface and is with a very narrow orientational distribution. The doubly hydrogen-bonded donor water molecules have their dipole vector pointing away from the liquid phase.
Collapse
Affiliation(s)
- Wei Gan
- State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100080, China
| | | | | | | | | |
Collapse
|