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Bian HT, Guo Y, Wang HF. Non-parabolic potential dependence of optical second harmonic generation from the Si(111) electrode/electrolyte interface. Phys Chem Chem Phys 2018; 20:29539-29548. [DOI: 10.1039/c8cp05621h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We performed potential dependent second harmonic generation (SHG) measurements on the Si(111) electrolyte interface at different azimuthal angles and for different polarization combinations.
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Affiliation(s)
- Hong-tao Bian
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an
| | - Yuan Guo
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Molecular Reaction Dynamics
- Institute of Chemistry
- Chinese Academy of Sciences
- University of Chinese Academy of Sciences
| | - Hong-fei Wang
- Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials
- Fudan University
- Shanghai
- China
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2
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Wei Q, Zhou D, Bian H. Molecular structure and adsorption of dimethyl sulfoxide at the air/aqueous solution interface probed by non-resonant second harmonic generation. Phys Chem Chem Phys 2018; 20:11758-11767. [DOI: 10.1039/c8cp00099a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, non-resonant second harmonic generation (SHG) was used to investigate the molecular structure and adsorption of DMSO at the air/neat DMSO liquid and air/DMSO aqueous solution interfaces.
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Affiliation(s)
- Qianshun Wei
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi’an
- China
| | - Dexia Zhou
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi’an
- China
| | - Hongtao Bian
- Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi’an
- China
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3
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O'Brien DB, Anglin TC, Massari AM. Surface chemistry and annealing-driven interfacial changes in organic semiconducting thin films on silica surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:13940-9. [PMID: 21970750 DOI: 10.1021/la202958a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Vibrational sum frequency generation (VSFG) spectroscopy was used in conjunction with steady-state IR spectroscopy, atomic force microscopy (AFM), and spectroscopic ellipsometry to characterize organic semiconductor thin films that were vapor deposited on silica- and trimethoxy(octadecyl)silane (ODTMS)-functionalized silica surfaces. The growth of perylene derivative N,N'-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C(8)) was found to proceed differently on simple glass slides relative to that of native oxide on silicon and fused quartz slides. VSFG was applied to these samples to isolate structural changes that occurred specifically at the buried interface between the organic semiconductor and the silica dielectric upon thermal annealing. A model was introduced to globally fit the imide carbonyl symmetric and asymmetric interfacial spectra that included contributions from both inner and outer interfaces. The fits to the VSFG data and AFM topographic images revealed significant reordering at the outer interface on all substrates upon thermal annealing. Within the model, the spectroscopic data reported that the inner interfacial PTCDI-C(8) monolayer reoriented to a more reclined phase on bare substrates after annealing but remained essentially unchanged on ODTMS monolayers. Electrical characterization of PTCDI-C(8) field-effect transistors indicated that electron mobilities were higher on bare substrate devices but could be improved by a factor of 2 on both surface types by thermal annealing. The mobility effects were attributed to the annealing-driven coalescence of PTCDI-C(8) grain boundaries. Consistent with previous structural reports, the molecular rearrangements of the first monolayer of PTCDI-C(8) on bare substrates that were reported by VSFG spectroscopy had a noticeable impact on the device performance.
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Affiliation(s)
- Daniel B O'Brien
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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4
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Wróbel D, Graja A. Photoinduced electron transfer processes in fullerene–organic chromophore systems. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.12.026] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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5
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Huang C, Wang RK, Wong BM, McGee DJ, Léonard F, Kim YJ, Johnson KF, Arnold MS, Eriksson MA, Gopalan P. Spectroscopic properties of nanotube-chromophore hybrids. ACS NANO 2011; 5:7767-7774. [PMID: 21919456 DOI: 10.1021/nn202725g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Recently, individual single-walled carbon nanotubes (SWNTs) functionalized with azo-benzene chromophores were shown to form a new class of hybrid nanomaterials for optoelectronics applications. Here we use a number of experimental and computational techniques to understand the binding, orientation, and nature of coupling between chromophores and the nanotubes, all of which are relevant to future optimization of these hybrid materials. We find that the binding energy between chromophores and nanotubes depends strongly on the type of tether that is used to bind the chromophores to the nanotubes. The pyrene tethers form a much stronger attachment to nanotubes compared to anthracene or benzene rings, resulting in more than 80% retention of bound chromophores post-processing. Density functional theory (DFT) calculations show that the binding energy of the chromophores to the nanotubes is maximized for chromophores parallel to the nanotube sidewall, even with the use of tethers; optical second harmonic generation measurements show that there is nonetheless a partial radial orientation of the chromophores on the nanotubes. We find weak electronic coupling between the chromophores and the SWNTs, consistent with noncovalent binding. This weak coupling is still sufficient to quench the chromophore fluorescence through a combination of static and dynamic processes. Photoluminescence measurements show a lack of significant energy transfer from the chromophores to isolated semiconducting nanotubes.
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Affiliation(s)
- Changshui Huang
- Department of Materials Science & Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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6
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Madden JT, Hall VJ, Simpson GJ. Mining the polarization-dependence of nonlinear optical measurements. Analyst 2010; 136:652-62. [PMID: 21076729 DOI: 10.1039/c0an00238k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electromagnetic field strength present within the focal volume of a pulsed laser is routinely high enough to produce reasonably efficient nonlinear summing and mixing of optical frequencies. The polarization-dependence of the outgoing beam is a sensitive function of the polarization state(s) of the incident beam(s) and the structure, orientation, and symmetry of the sample. Mining this information hinges on two elements: (1) accurate and precise polarization-dependent measurements, and (2) reliable modeling to relate the measured responses back to local structure and orientation. The central focus of this review is on the first step. Experimental strategies for precise and accurate nonlinear optical ellipsometry (NOE) polarization measurements are summarized for the most common and simplest case of second harmonic generation (SHG), or the frequency doubling of light, although extension to higher-order nonlinear optical interactions is straightforward in most cases.
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Affiliation(s)
- Jeremy T Madden
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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7
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von Bilderling C, Tagliazucchi M, Calvo EJ, Bragas AV. Molecular orientation in self-assembled multilayers measured by second harmonic generation using femtosecond pulses. OPTICS EXPRESS 2009; 17:10642-10647. [PMID: 19550460 DOI: 10.1364/oe.17.010642] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present measurements of the optical second-harmonic generation in self assembled multilayer films of PAZO/PAH polymers with the aim to investigate molecular order in the layer-by-layer architecture. The experiments are performed in transmission, using a femtosecond Ti:Sa pulsed laser, which allows a more accurate determination of the amplitude of the second harmonic signal, without interference fringes usually present in nanosecond experiments. We found that the first bilayer, in contact with the substrate, presents a broad distribution of the orientation of the molecules, while the addition of successive bilayers (up to 12) produces ordering of the molecules with a small tilt angle respect to the surface normal. This result, together with the monotonic increment of the second harmonic signal with the number of layers indicates that the molecules grow orderly assembled in these films.
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8
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Brindza MR, Walker RA. Differentiating Solvation Mechanisms at Polar Solid/Liquid Interfaces. J Am Chem Soc 2009; 131:6207-14. [DOI: 10.1021/ja810117f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Michael R. Brindza
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
| | - Robert A. Walker
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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9
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Zheng DS, Wang Y, Liu AA, Wang HF. Microscopic molecular optics theory of surface second harmonic generation and sum-frequency generation spectroscopy based on the discrete dipole lattice model. INT REV PHYS CHEM 2008. [DOI: 10.1080/01442350802343981] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Wang J, Lee SH, Chen Z. Quantifying the Ordering of Adsorbed Proteins In Situ. J Phys Chem B 2008; 112:2281-90. [DOI: 10.1021/jp077556u] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jie Wang
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Sang-Ho Lee
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Zhan Chen
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109
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11
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Gibbs-Davis JM, Hayes PL, Scheidt KA, Geiger FM. Anion Chelation by Amido Acid Functionalized Fused Quartz/Water Interfaces Studied by Nonlinear Optics. J Am Chem Soc 2007; 129:7175-84. [PMID: 17497776 DOI: 10.1021/ja068117w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We report resonantly enhanced surface second harmonic generation (SHG) measurements to track the interaction of the EPA priority toxic metal pollutant chromium(VI) with fused quartz/water interfaces containing tailor-made amino acids that serve as model systems for environmental and biological interfaces. chi3 measurements of amido acid functionalized fused quartz/water interfaces are consistent with two acid-base equilibria, suggesting the formation of a laterally hydrogen-bonded environment similar to what is observed for aliphatic carboxylic acids. Chromate adsorption isotherms recorded at pH 7 are suggestive of an intramolecular chelation mechanism that becomes important when four or more hydrogen-bonding moieties are displayed toward the incoming chromate. The strong binding affinities of the amido acid functionalized fused quartz/water interfaces toward chromate are consistent with nearly 50% slower transport rates with respect to free-flowing groundwater, indicating that, in the absence of redox processes, peptide materials in heterogeneous geochemical environments can significantly increase chromate residence times. The strong evidence for synergistic effects dominating the interactions of chromate with surface-bound amido acids indicates that chemical complexity can be systematically addressed using tailor-made organic surfaces and interfaces.
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Affiliation(s)
- Julianne M Gibbs-Davis
- Department of Chemistry and International Institute for Nanotechnology, Institute for Environmental Catalysis, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
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12
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Dehen CJ, Everly RM, Plocinik RM, Hedderich HG, Simpson GJ. Discrete retardance second harmonic generation ellipsometry. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:013106. [PMID: 17503906 DOI: 10.1063/1.2400011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A new instrument was constructed to perform discrete retardance nonlinear optical ellipsometry (DR-NOE). The focus of the design was to perform second harmonic generation NOE while maximizing sample and application flexibility and minimizing data acquisition time. The discrete retardance configuration results in relatively simple computational algorithms for performing nonlinear optical ellipsometric analysis. NOE analysis of a disperse red 19 monolayer yielded results that were consistent with previously reported values for the same surface system, but with significantly reduced acquisition times.
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Affiliation(s)
- Christopher J Dehen
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, USA
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13
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Zhang WK, Wang HF, Zheng DS. Quantitative measurement and interpretation of optical second harmonic generation from molecular interfaces. Phys Chem Chem Phys 2006; 8:4041-52. [PMID: 17028693 DOI: 10.1039/b608005g] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Second harmonic generation (SHG) has been proven a uniquely effective technique in the investigation of molecular structure and conformations, as well as dynamics of molecular interfaces. The ability to apply SHG to molecular interface studies depends on the ability to abstract quantitative information from the measurable quantities in the actual SHG experiments. In this review, we try to assess recent developments in the SHG experimental methodologies towards quantitative analysis of the nonlinear optical properties of the achiral molecular interfaces with rotational isotropy along the interface normal. These developments include the methodology for orientational analysis of the SHG experimental data, the experimental approaches for more accurate SHG measurements, and a novel treatment of the symmetry properties of the molecular polarizability tensors in association with the experimentally measurable quantities. In the end, the recent developments on the problem of surface versus bulk contribution in SHG surface studies is discussed. These developments can put SHG on a more solid foundation for molecular interface studies, and to pave the way for better understanding and application of SHG surface studies in general.
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Affiliation(s)
- Wen-kai Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, ZhongGuanCun, Beijing, China100080
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14
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Heflin JR, Guzy MT, Neyman PJ, Gaskins KJ, Brands C, Wang Z, Gibson HW, Davis RM, Van Cott KE. Efficient, thermally stable, second order nonlinear optical response in organic hybrid covalent/ionic self-assembled films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:5723-7. [PMID: 16768500 DOI: 10.1021/la0602970] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A covalent/electrostatic layer-by-layer self-assembly method was used to achieve polar ordering of a water soluble, reactive dye in the fabrication of nonlinear optical (NLO) films. We observed a quadratic relationship between the second harmonic intensity I2(omega) and bilayer number for all films made with Procion Brown MX-GRN, demonstrating that the polar ordering of the chromophores is consistent in each successive bilayer. As the ionic strength of the dye deposition solution was increased to 0.5 M NaCl, the of the films increased by approximately 250% to 50 x 10(-9) esu, with a corresponding average chromophore tilt angle of 38 degrees . This was attributed to increased shielding of the dye charges which led to higher chromophore density in the bilayers. The electrooptic coefficient for films of 50 bilayers fabricated at 0.5 M NaCl was 14 +/- 2 pm/V. Importantly, these films exhibited excellent thermal stability, with only a 10% decrease in (I2(omega))(1/2) after 36 h at 85 degrees C and then 24 h at 150 degrees C. Furthermore, the (I2(omega))(1/2) recovered completely upon cooling to room temperature. These results with a commodity textile dye point to the potential value of this class of reactive chromophores and this self-assembly method for fabrication of electrooptic materials at ambient conditions from aqueous solutions.
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Affiliation(s)
- James R Heflin
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
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15
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Abstract
Thermal fluctuations cause the local normal vectors of fluid interfaces to deviate from the vertical direction defined by the flat mean interface position. This leads to a nonzero mean value of the corresponding polar tilt angle which renders a characterization of the thermal state of an interface. Based on the concept of an effective interface Hamiltonian we determine the variances of the local interface position and of its lateral derivatives. This leads to the probability distribution functions for the metric of the interface and for the tilt angle which allows us to calculate its mean value and its mean-square deviation. We compare the temperature dependences of these quantities as predicted by the simple capillary-wave model, by an improved phenomenological model, and by the microscopic effective interface Hamiltonian derived from density-functional theory. The mean tilt angle discriminates clearly between these theoretical approaches and emphasizes the importance of the variation of the surface tension at small wavelengths. Also the tilt angle two-point correlation function is determined which renders an additional structural characterization of interfacial fluctuations. Various experimental accesses to measure the local orientational fluctuations are discussed.
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Affiliation(s)
- Klaus Mecke
- Institut für Theoretische Physik, Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany.
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Sung J, Park K, Kim D. Surfaces of Alcohol−Water Mixtures Studied by Sum-Frequency Generation Vibrational Spectroscopy. J Phys Chem B 2005; 109:18507-14. [PMID: 16853383 DOI: 10.1021/jp051959h] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Sum-frequency generation vibrational spectroscopy was used to investigate the surface molecular structure of binary mixtures of water and alcohol (methanol, ethanol, and propanol) at the air/liquid interface. In this study, it is shown that the sum-frequency signal from the alcohol molecules in the CH-stretch vibration region is always larger for mixtures than that from pure alcohol. For example, the sum-frequency signal from a propanol mixture surface at a 0.1 bulk mole fraction was approximately 3 times larger than that from a pure propanol surface. However, the ratio between the sum-frequency signals taken at different polarization combinations was found to be constant within experimental errors as the bulk alcohol concentration was changed. This suggested that the orientation of surface alcohol molecules does not vary appreciably with the change of concentration and that the origin of the signal enhancement is mainly due to the increase in the surface number density of alcohol molecules contributing to the sum-frequency signal for the alcohol/water mixture as compared to the pure alcohol surface.
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Affiliation(s)
- Jaeho Sung
- Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University, Seoul 121-742, Korea
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17
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Chen H, Gan W, Wu BH, Wu D, Guo Y, Wang HF. Determination of Structure and Energetics for Gibbs Surface Adsorption Layers of Binary Liquid Mixture 1. Acetone + Water. J Phys Chem B 2005; 109:8053-63. [PMID: 16851941 DOI: 10.1021/jp050188e] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The orientation, structure, and energetics of the vapor/acetone-water interface are studied with sum frequency generation vibrational spectroscopy (SFG-VS). We used the polarization null angle (PNA) method in SFG-VS to accurately determine the interfacial acetone molecule orientation, and we found that the acetone molecule has its C=O group pointing into bulk phase, one CH3 group pointing up from the bulk, and the other CH3 group pointing into the bulk phase. This well-ordered interface layer induces an antiparallel structure in the second layer through dimer formation from either dipolar or hydrogen bond interactions. With a double-layer adsorption model (DAM) and Langmuir isotherm, the adsorption free energies for the first and second layer are determined as deltaG degrees (ads,1) = - 1.9 +/- 0.2 kcal /mol and deltaG degrees (ads,2) = - 0.9 +/- 0.2 kcal /mol, respectively. Since deltaG degrees (ads,1) is much larger than the thermal energy kT = 0.59 kcal /mol, and deltaG degrees (ads,2) is close to kT, the second layer has to be less ordered. Without either strong dipolar or hydrogen bonding interactions between the second and the third layer, the third layer should be randomly thermalized as in the bulk liquid. Therefore, the thickness of the interface is not more than two layers thick. These results are consistent with previous MD simulations for the vapor/pure acetone interface, and undoubtedly provide direct microscopic structural evidences and new insight for the understanding of liquid and liquid mixture interfaces. The experimental techniques and quantitative analysis methodology used for detailed measurement of the liquid mixture interfaces in this report can also be applied to liquid interfaces, as well as other molecular interfaces in general.
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Affiliation(s)
- Hua Chen
- State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, PR China 100080
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18
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Li F, Zare RN. Molecular Orientation Study of Methylene Blue at an Air/Fused-Silica Interface Using Evanescent-Wave Cavity Ring-Down Spectroscopy. J Phys Chem B 2005; 109:3330-3. [PMID: 16851361 DOI: 10.1021/jp045290a] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using evanescent-wave cavity ring-down spectroscopy (EW-CRDS), we monitored the change in the absorbance of a thin film of methylene blue (MB) at an air/fused-silica interface while varying the polarization of the incident light (600 nm). We derived the average orientation angle of the planar MB molecules with respect to the surface normal and observed that the average orientation angle decreases as the surface concentration increases. At low surface concentrations, the MB molecules lie almost flat on the surface, whereas at higher surface concentrations the molecules become vertically oriented.
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Affiliation(s)
- Fuping Li
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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19
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Richter LJ, Yang CSC, Wilson PT, Hacker CA, van Zee RD, Stapleton JJ, Allara DL, Yao Y, Tour JM. Optical Characterization of Oligo(phenylene−ethynylene) Self-Assembled Monolayers on Gold. J Phys Chem B 2004. [DOI: 10.1021/jp0492366] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Plocinik RM, Simpson GJ. Polarization characterization in surface second harmonic generation by nonlinear optical null ellipsometry. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00994-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Cattaneo S, Rouhento C, Vuorimaa E, Efimov A, Lemmetyinen H, Kauranen M. Head-to-tail organization of terthiophene–vinylbenzoate in Langmuir–Blodgett films. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)01196-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Zhang X, Cunningham MM, Walker RA. Solvent Polarity at Polar Solid Surfaces: The Role of Solvent Structure. J Phys Chem B 2003. [DOI: 10.1021/jp021071i] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaoyi Zhang
- Chemical Physics Program and Department of Chemistry and Biochemistry, University of MarylandCollege Park, College Park, Maryland 20742
| | - Margaret M. Cunningham
- Chemical Physics Program and Department of Chemistry and Biochemistry, University of MarylandCollege Park, College Park, Maryland 20742
| | - Robert A. Walker
- Chemical Physics Program and Department of Chemistry and Biochemistry, University of MarylandCollege Park, College Park, Maryland 20742
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Steel WH, Walker RA. Solvent polarity at an aqueous/alkane interface: the effect of solute identity. J Am Chem Soc 2003; 125:1132-3. [PMID: 12553791 DOI: 10.1021/ja028468k] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Resonance-enhanced second harmonic generation (SHG) has been used to probe the solvatochromic behavior of two small, aromatic chromophores adsorbed to the aqueous/cyclohexane, liquid/liquid interface. SHG spectra of p-nitrophenol (PNP) and 2,6-dimethyl-PNP (dmPNP) indicate that these two chromophores sample markedly different environments. PNP sees a polar, waterlike environment, whereas solvent polarity surrounding dmPNP is dominated by the nonpolar, organic phase. Results suggest that subtle changes in solute structure can change the distribution of solutes across an interface and thus change a solute's local solvation environment.
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Affiliation(s)
- William H Steel
- Department of Chemistry and Biochemistry, University of Maryland, College Park, College Park, Maryland 20742, USA
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24
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Simpson GJ. Structural origins of circular dichroism in surface second harmonic generation. J Chem Phys 2002. [DOI: 10.1063/1.1494423] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Ma G, Allen HC. Diffuse reflection broad bandwidth sum frequency generation from particle surfaces. J Am Chem Soc 2002; 124:9374-5. [PMID: 12167023 DOI: 10.1021/ja017864k] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the first vibrational sum frequency generation (VSFG) spectroscopic study from particle surfaces of powdered solids using a modified SFG approach, diffuse reflection broad bandwidth sum frequency generation (DR-BBSFG). The DR-BBSFG spectrum of sodium dodecyl sulfate (SDS, C(12)H(25)SO(4)Na) powdered solids was obtained. Five peaks were resolved by calculated fits. Possible origins of the SFG response from SDS particle surfaces are discussed. Potential applications of DR-BBSFG spectroscopy are addressed.
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Affiliation(s)
- Gang Ma
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus 43210, USA
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26
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Briggman KA, Stephenson JC, Wallace WE, Richter LJ. Absolute Molecular Orientational Distribution of the Polystyrene Surface. J Phys Chem B 2001. [DOI: 10.1021/jp0037495] [Citation(s) in RCA: 170] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kimberly A. Briggman
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8372
| | - John C. Stephenson
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8372
| | - William E. Wallace
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8372
| | - Lee J. Richter
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8372
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