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Patel D, Sooraj BS, Kirakci K, Macháček J, Kučeráková M, Bould J, Dušek M, Frey M, Neumann C, Ghosh S, Turchanin A, Pradeep T, Base T. Macropolyhedral syn-B 18H 22, the "Forgotten" Isomer. J Am Chem Soc 2023; 145:17975-17986. [PMID: 37532522 PMCID: PMC10436279 DOI: 10.1021/jacs.3c05530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Indexed: 08/04/2023]
Abstract
The chemistry and physics of macropolyhedral B18H22 clusters have attracted significant attention due to the interesting photophysical properties of anti-B18H22 (blue emission, laser properties) and related potential applications. We have focused our attention on the "forgotten" syn-B18H22 isomer, which has received very little attention since its discovery compared to its anti-B18H22 isomer, presumably because numerous studies have reported this isomer as nonluminescent. In our study, we show that in crystalline form, syn-B18H22 exhibits blue fluorescence and becomes phosphorescent when substituted at various positions on the cluster, associated with peculiar microstructural-dependent effects. This work is a combined theoretical and experimental investigation that includes the synthesis, separation, structural characterization, and first elucidation of the photophysical properties of three different monothiol-substituted cluster isomers, [1-HS-syn-B18H21] 1, [3-HS-syn-B18H21] 3, and [4-HS-syn-B18H21] 4, of which isomers 1 and 4 have been proved to exist in two different polymorphic forms. All of these newly substituted macropolyhedral cluster derivatives (1, 3, and 4) have been fully characterized by NMR spectroscopy, mass spectrometry, single-crystal X-ray diffraction, IR spectroscopy, and luminescence spectroscopy. This study also presents the first report on the mechanochromic shift in the luminescence of a borane cluster and generally enriches the area of rather rare boron-based luminescent materials. In addition, we present the first results proving that they are useful constituents of carbon-free self-assembled monolayers.
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Affiliation(s)
- Deepak
Kumar Patel
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - B. S. Sooraj
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Kaplan Kirakci
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Jan Macháček
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Monika Kučeráková
- Institute
of Physics, The Czech Academy of Science, 182 21 Prague 8, Czech Republic
| | - Jonathan Bould
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Michal Dušek
- Institute
of Physics, The Czech Academy of Science, 182 21 Prague 8, Czech Republic
| | - Martha Frey
- Institute
of Physical Chemistry Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Christof Neumann
- Institute
of Physical Chemistry Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Sundargopal Ghosh
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
| | - Andrey Turchanin
- Institute
of Physical Chemistry Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Thalappil Pradeep
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
| | - Tomas Base
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
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2
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Bilotto P, Imre AM, Dworschak D, Mears LLE, Valtiner M. Visualization of Ion|Surface Binding and In Situ Evaluation of Surface Interaction Free Energies via Competitive Adsorption Isotherms. ACS PHYSICAL CHEMISTRY AU 2021; 1:45-53. [PMID: 34939072 PMCID: PMC8679647 DOI: 10.1021/acsphyschemau.1c00012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Indexed: 11/30/2022]
Abstract
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Function and properties
at biologic as well as technological interfaces
are controlled by a complex and concerted competition of specific
and unspecific binding with ions and water in the electrolyte. It
is not possible to date to directly estimate by experiment the interfacial
binding energies of involved species in a consistent approach, thus
limiting our understanding of how interactions in complex (physiologic)
media are moderated. Here, we employ a model system utilizing polymers
with end grafted amines interacting with a negatively charged mica
surface. We measure interaction forces as a function of the molecule
density and ion concentration in NaCl solutions. The measured adhesion
decreases by about 90%, from 0.01 to 1 M electrolyte concentration.
We further demonstrate by molecular resolution imaging how ions increasingly
populate the binding surface at elevated concentrations, and are effectively
competing with the functional group for a binding site. We demonstrate
that a competing Langmuir isotherm model can describe this concentration-dependent
competition. Further, based on this model we can quantitatively estimate
ion binding energies, as well as binding energy relationships at a
complex solid|liquid interface. Our approach enables the extraction
of thermodynamic interaction energies and kinetic parameters of ionic
species during monolayer level interactions at a solid|liquid interface,
which to-date is impossible with other techniques.
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Affiliation(s)
- Pierluigi Bilotto
- Institute of Applied Physics, Applied Interface Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - Alexander M. Imre
- Institute of Applied Physics, Applied Interface Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - Dominik Dworschak
- Institute of Applied Physics, Applied Interface Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - Laura L. E. Mears
- Institute of Applied Physics, Applied Interface Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - Markus Valtiner
- Institute of Applied Physics, Applied Interface Physics, Vienna University of Technology, 1040 Vienna, Austria
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3
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Li K, Wang W, Xiao F, Ge Y, Jin H, Yu Z, Gong J, Gao W, Peng Z. Atomic Force Microscopy Study of Non-DLVO Interactions between Drops and Bubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6830-6837. [PMID: 34043914 DOI: 10.1021/acs.langmuir.1c00937] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The heterointeraction between liquid drops and air bubbles dispersed in another immiscible liquid is studied with the application of the atomic force microscopy (AFM) probe techniques. The tetradecane drops and air bubbles readily coalescence to form a lens-like structure in 100 mM sodium chloride aqueous solution, demonstrating strong hydrophobic (HB) attraction. The interaction range and strength of this hydrophobic attraction between oil drops and air bubbles is investigated by fine control of electrical double layer thicknesses related to specific electrolyte concentrations, and a midrange term in combination with a short-range term is found to present a proper characterization of this hydrophobic attraction. A further step is taken by introducing a triblock copolymer (Pluronic F68) into the aqueous solution, with results indicating that a relatively long-range steric hindrance (SH) furnished by a polymer "brush" surmounts the hydrophobic attraction. Finally, the interaction between a water drop and an air bubble in tetradecane is also measured as a comparison. The repelling action between a hydrophobic body (air bubble) and water drop indicates a strong repulsion. The present results show an interesting understanding of hydrophobic interactions between drops and bubbles, which is of potential application in controlling dispersion stability.
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Affiliation(s)
- Kai Li
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Wei Wang
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Fan Xiao
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Yuntong Ge
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Hang Jin
- Tianjin Research Institute for Water Transport Engineering, Key Laboratory of Environmental Protection Technology on Water Transport, Ministry of Transport, No. 2618 Xingang Second Road, Binhai New District, 300456 Tianjin, P. R. China
| | - Zhipeng Yu
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Jing Gong
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Weiwei Gao
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
| | - Zeheng Peng
- Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, State Key Laboratory of Natural Gas Hydrates, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing, No. 18 Fuxue Road, Changping District, 102249 Beijing, P. R. China
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4
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Guo F, de Lima Stebbins D, Toomey RG, Alcantar NA. Interfacial Phenomena of Natural Dispersants for Crude Oil Spills. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15904-15913. [PMID: 31607124 DOI: 10.1021/acs.langmuir.9b02036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A natural surfactant was studied to simulate the dispersion process of crude oil in water. The interfacial phenomena of this natural dispersant was compared with a commercially available chemical dispersant, COREXIT EC9500A. This functional surfactant was extracted from the mucilage of the Opuntia ficus-indica cactus species. The evaluation to determine the efficacy to disperse crude oil of the cactus-based mucilage extract (nongelling extract, NE) was based on characterizing surface and interfacial tension, dispersion efficiency, mixing effects, salinity effects, stability, and droplets size distributions. We found that surface tension values follow a linear relationship with respect to the natural logarithm of the concentrations of NE. The application of NE in the water phase led to decreasing oil/water interfacial tensions. Surface tension tests were also used to quantify the effect of oil-in-water (O/W) emulsion ratios once either natural or commercialized dispersants were added. A key finding of our work is that the surface tension between typical 6% and 3% v/v O/W emulsions was significantly reduced with the addition of discrete amounts of NE. This result indicated that the dynamic balance between O/W and water-in-oil (W/O) emulsions was thermodynamically more stable toward O/W emulsion states with NE. We also found that O/W emulsions with higher dispersion effectiveness were formed for both 10 and 35 practical salinity units, as the dispersant to oil ratios increased, with a significant correlation to the mixing energy. We observed that the O/W emulsions with natural dispersants had a significantly smaller weighted average diameter compared to those with COREXIT EC9500A. Such a phenomenon can be explained by understanding intermolecular interactions due to the structure and type of dispersant. In conclusion, cactus-based mucilage extracts could be used as environmentally benign dispersants and, therefore, reduce negative social perceptions of the application of dispersants to clean up spilled oil.
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Affiliation(s)
- Fei Guo
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
| | - Daniela de Lima Stebbins
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
| | - Ryan G Toomey
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
| | - Norma A Alcantar
- Department of Chemical and Biomedical Engineering , University of South Florida , Tampa , Florida 33620 , United States
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5
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Zhang L, Xie L, Cui X, Chen J, Zeng H. Intermolecular and surface forces at solid/oil/water/gas interfaces in petroleum production. J Colloid Interface Sci 2018; 537:505-519. [PMID: 30469119 DOI: 10.1016/j.jcis.2018.11.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 11/12/2018] [Accepted: 11/12/2018] [Indexed: 11/25/2022]
Abstract
Many challenging issues are encountered along the petroleum production such as the wettability alteration of reservoir solids due to deposition of petroleum materials, stabilization/destabilization of water-in-oil and oil-in-water emulsions and treatment of tailings water. All these problems are essentially driven by the fundamental intermolecular and surface forces among the different components (i.e., water, oil, solid and gas) in the surrounding complex fluid media, and comprehensive understanding of the interactions among these components will pave the way to the development of advanced materials and technologies for improved petroleum production processes. In this work, we have reviewed the quantitative force measurement methods in different petroleum systems by using nanomechanical techniques including surface forces apparatus (SFA) and atomic force microscope (AFM). Interaction forces between petroleum components (e.g., asphaltenes) and mineral solids in both organic solvents and aqueous solutions are reviewed and correlated to the wettability change of the reservoir solids. The recent key progress in quantifying the surface forces of water-in-oil and oil-in-water emulsion drops using AFM drop probe techniques are discussed. The interaction forces of polymer flocculants and colloidal particles are correlated to the performance of tailings water treatment. The current knowledge gap and future perspectives are also presented.
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Affiliation(s)
- Ling Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Xinwei Cui
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Jingsi Chen
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
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6
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Xie L, Wang J, Huang J, Cui X, Wang X, Liu Q, Zhang H, Liu Q, Zeng H. Anisotropic Polymer Adsorption on Molybdenite Basal and Edge Surfaces and Interaction Mechanism With Air Bubbles. Front Chem 2018; 6:361. [PMID: 30211150 PMCID: PMC6124653 DOI: 10.3389/fchem.2018.00361] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 07/30/2018] [Indexed: 11/13/2022] Open
Abstract
The anisotropic surface characteristics and interaction mechanisms of molybdenite (MoS2) basal and edge planes have attracted much research interest in many interfacial processes such as froth flotation. In this work, the adsorption of a polymer depressant [i.e., carboxymethyl cellulose (CMC)] on both MoS2 basal and edge surfaces as well as their interaction mechanisms with air bubbles have been characterized by atomic force microscope (AFM) imaging and quantitative force measurements. AFM imaging showed that the polymer coverage on the basal plane increased with elevating polymer concentration, with the formation of a compact polymer layer at 100 ppm CMC; however, the polymer adsorption was much weaker on the edge plane. The anisotropy in polymer adsorption on MoS2 basal and edge surfaces coincided with water contact angle results. Direct force measurements using CMC functionalized AFM tips revealed that the adhesion on the basal plane was about an order of magnitude higher than that on the edge plane, supporting the anisotropic CMC adsorption behaviors. Such adhesion difference could be attributed to their difference in surface hydrophobicity and surface charge, with weakened hydrophobic attraction and strengthened electrostatic repulsion between the polymers and edge plane. Force measurements using a bubble probe AFM showed that air bubble could attach to the basal plane during approach, which could be effectively inhibited after polymer adsorption. The edge surface, due to the negligible polymer adsorption, showed similar interaction behaviors with air bubbles before and after polymer treatment. This work provides useful information on the adsorption of polymers on MoS2 basal/edge surfaces as well as their interaction mechanism with air bubbles at the nanoscale, with implications for the design and development of effective polymer additives to mediate the bubble attachment on solid particles with anisotropic surface properties in mineral flotation and other engineering processes.
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Affiliation(s)
- Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Jingyi Wang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Jun Huang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Xin Cui
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Xiaogang Wang
- College of Material Science and Engineering, Heavy Machinery Engineering Research Center of Education Ministry, Taiyuan University of Science and Technology, Taiyuan, China
| | - Qingxia Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Hao Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Qi Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
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7
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Li B, Wang X, Li Y, Paananen A, Szilvay GR, Qin M, Wang W, Cao Y. Single-Molecule Force Spectroscopy Reveals Self-Assembly Enhanced Surface Binding of Hydrophobins. Chemistry 2018; 24:9224-9228. [PMID: 29687928 DOI: 10.1002/chem.201801730] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Indexed: 01/26/2023]
Abstract
Hydrophobins have raised lots of interest as powerful surface adhesives. However, it remains largely unexplored how their strong and versatile surface adhesion is linked to their unique amphiphilic structural features. Here, we develop an AFM-based single-molecule force spectroscopy assay to quantitatively measure the binding strength of hydrophobin to various types of surfaces both in isolation and in preformed protein films. We find that individual class II hydrophobins (HFBI) bind strongly to hydrophobic surfaces but weakly to hydrophilic ones. After self-assembly into protein films, they show much stronger binding strength to both surfaces due to the cooperativity of different interactions at nanoscale. Such self-assembly enhanced surface binding may serve as a general design principle for synthetic bioactive adhesives.
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Affiliation(s)
- Bing Li
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing, 210093, P. R. China
| | - Xin Wang
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing, 210093, P. R. China
| | - Ying Li
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, Jiangsu, 210044, P. R. China
| | - Arja Paananen
- Industrial Biotechnology, VTT Technical Research Centre of Finland Ltd, 02044 VTT, Espoo, Finland
| | - Géza R Szilvay
- Industrial Biotechnology, VTT Technical Research Centre of Finland Ltd, 02044 VTT, Espoo, Finland
| | - Meng Qin
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing, 210093, P. R. China
| | - Wei Wang
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing, 210093, P. R. China
| | - Yi Cao
- Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing, 210093, P. R. China
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8
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Thomas JC, Goronzy DP, Serino AC, Auluck HS, Irving OR, Jimenez-Izal E, Deirmenjian JM, Macháček J, Sautet P, Alexandrova AN, Baše T, Weiss PS. Acid-Base Control of Valency within Carboranedithiol Self-Assembled Monolayers: Molecules Do the Can-Can. ACS NANO 2018; 12:2211-2221. [PMID: 29393628 PMCID: PMC6350814 DOI: 10.1021/acsnano.7b09011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We use simple acid-base chemistry to control the valency in self-assembled monolayers of two different carboranedithiol isomers on Au{111}. Monolayer formation proceeds via Au-S bonding, where manipulation of pH prior to or during deposition enables the assembly of dithiolate species, monothiol/monothiolate species, or combination. Scanning tunneling microscopy (STM) images identify two distinct binding modes in each unmodified monolayer, where simultaneous spectroscopic imaging confirms different dipole offsets for each binding mode. Density functional theory calculations and STM image simulations yield detailed understanding of molecular chemisorption modes and their relation with the STM images, including inverted contrast with respect to the geometric differences found for one isomer. Deposition conditions are modified with controlled equivalents of either acid or base, where the coordination of the molecules in the monolayers is controlled by protonating or deprotonating the second thiol/thiolate on each molecule. This control can be exercised during deposition to change the valency of the molecules in the monolayers, a process that we affectionately refer to as the "can-can." This control enables us to vary the density of molecule-substrate bonds by a factor of 2 without changing the molecular density of the monolayer.
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Affiliation(s)
- John C. Thomas
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Dominic P. Goronzy
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Andrew C. Serino
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Harsharn S. Auluck
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Olivia R. Irving
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Elisa Jimenez-Izal
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Kimika fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), and Donostia International Physics Center (DIPC), P. K. 1072, 20080 Donostia, Euskadi, Spain
| | - Jacqueline M. Deirmenjian
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Jan Macháček
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, v.v.i. 250 68 Husinec-Řež, č.p. 1001, Czech Republic
| | - Philippe Sautet
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Anastassia N. Alexandrova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
| | - Tomáš Baše
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, v.v.i. 250 68 Husinec-Řež, č.p. 1001, Czech Republic
| | - Paul S. Weiss
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, United States
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, United States
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, United States
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9
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Gao Z, Xie L, Cui X, Hu Y, Sun W, Zeng H. Probing Anisotropic Surface Properties and Surface Forces of Fluorite Crystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2511-2521. [PMID: 29365255 DOI: 10.1021/acs.langmuir.7b04165] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Fluorite is the most important mineral source for producing fluorine-based chemicals and materials in a wide range of engineering and technological applications. In this work, atomic force microscopy was employed, for the first time, to probe the surface interactions and adhesion energy of model oleic acid (a commonly used surface modification organics for fluorite) molecules on fluorite surfaces with different orientations in both air and aqueous solutions at different pH conditions. Fitted with the Derjaguin-Landau-Verwey-Overbeek theory, the force results during surface approaching demonstrate the anisotropy in the surface charge of different orientations, with the {111} surface exhibiting a higher magnitude of surface charge, which could be attributed to the difference in the atomic composition. The adhesion measured during surface retraction shows that model oleic acid molecules have a stronger adhesion with the {100} surface than with the {111} surface in both air and aqueous solutions. The anisotropic adhesion energy was analyzed in relation to the surface atom (especially calcium) activity, which was supported by the surface free energy results calculated based on a three-probe-liquid method. Each calcium atom on the {100} surface with four dangling bonds is more active than the calcium atom on the {111} surface with only one dangling bond, supported by a larger value of the Lewis acid component for the {100} surface. The model oleic acid molecules present in the ionic form at pH 9 exhibit a higher adhesion energy with fluorite surfaces as compared to their molecular form at pH 6, which was related to the surface activity of different forms. The adhesion energy measured in solution is much lower than that in air, indicating that the solvent exerts an important influence on the interactions of organic molecules with mineral surfaces. The results provide useful information on the fundamental understanding of surface interactions and adhesion energy of organic molecules on mineral surfaces with different orientations, and the methodology can be extended to many other crystal surfaces in various interfacial processes.
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Affiliation(s)
- Zhiyong Gao
- School of Minerals Processing and Bioengineering, Central South University , Changsha 410083, PR China
| | - Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 1H9, Canada
| | - Xin Cui
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 1H9, Canada
| | - Yuehua Hu
- School of Minerals Processing and Bioengineering, Central South University , Changsha 410083, PR China
| | - Wei Sun
- School of Minerals Processing and Bioengineering, Central South University , Changsha 410083, PR China
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 1H9, Canada
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10
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Xie L, Shi C, Cui X, Huang J, Wang J, Liu Q, Zeng H. Probing the Interaction Mechanism between Air Bubbles and Bitumen Surfaces in Aqueous Media Using Bubble Probe Atomic Force Microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:729-738. [PMID: 29045156 DOI: 10.1021/acs.langmuir.7b02693] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Surface interactions involving deformable air bubbles have attracted tremendous interest in a wide range of engineering applications, such as mineral flotation and bitumen extraction. In this work, for the first time, the interaction forces between air bubbles and bitumen surfaces in complex aqueous media of varying pH, salinity, and salts were directly measured using a bubble probe atomic force microscope (AFM) technique. The AFM topographic imaging reveals that bitumen surface tends to be rougher and form distinct domains at high NaCl concentration or under strongly alkaline environment. The force measurements demonstrate the critical role of ionic strength and solution pH in bubble-bitumen interaction and attachment, which could be well described by a theoretical model based on Reynolds lubrication theory and augmented Young-Laplace equation by including the effect of disjoining pressure. In 1 mM NaCl, the electrical double layer (EDL) repulsion inhibited bubble-bitumen attachment, and such a repulsive effect could be further strengthened with increasing solution pH. In 500 mM NaCl, the hydrophobic attraction could lead to bubble-bitumen attachment, while a high solution pH could weaken the hydrophobic interaction. The addition of calcium ion in 500 mM NaCl could enhance the hydrophobic interaction and facilitate the bubble-bitumen attachment, most likely attributed to the bridging effect between calcium ions and the functional groups (e.g., carboxyl group) of interface-active molecules on bitumen surfaces, thus leading to higher surface roughness and hydrophobic moieties/aggregates on bitumen as confirmed by AFM imaging. Our results provide quantitative information on the interaction mechanism between air bubbles and bitumen surfaces in complex aqueous solutions at the nanoscale, which has useful implications to many related interfacial interactions in industrial processes such as oil production, oil-water separation, and wastewater treatment.
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Affiliation(s)
- Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
| | - Chen Shi
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
| | - Xin Cui
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
| | - Jun Huang
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
| | - Jingyi Wang
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
| | - Qi Liu
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta, T6G 1H9, Canada
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Schwartz JJ, Mendoza AM, Wattanatorn N, Zhao Y, Nguyen VT, Spokoyny AM, Mirkin CA, Baše T, Weiss PS. Surface Dipole Control of Liquid Crystal Alignment. J Am Chem Soc 2016; 138:5957-67. [PMID: 27090503 DOI: 10.1021/jacs.6b02026] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Detailed understanding and control of the intermolecular forces that govern molecular assembly are necessary to engineer structure and function at the nanoscale. Liquid crystal (LC) assembly is exceptionally sensitive to surface properties, capable of transducing nanoscale intermolecular interactions into a macroscopic optical readout. Self-assembled monolayers (SAMs) modify surface interactions and are known to influence LC alignment. Here, we exploit the different dipole magnitudes and orientations of carboranethiol and -dithiol positional isomers to deconvolve the influence of SAM-LC dipolar coupling from variations in molecular geometry, tilt, and order. Director orientations and anchoring energies are measured for LC cells employing various carboranethiol and -dithiol isomer alignment layers. The normal component of the molecular dipole in the SAM, toward or away from the underlying substrate, was found to determine the in-plane LC director orientation relative to the anisotropy axis of the surface. By using LC alignment as a probe of interaction strength, we elucidate the role of dipolar coupling of molecular monolayers to their environment in determining molecular orientations. We apply this understanding to advance the engineering of molecular interactions at the nanoscale.
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Affiliation(s)
- Jeffrey J Schwartz
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Physics & Astronomy, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Alexandra M Mendoza
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Chemistry & Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Natcha Wattanatorn
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Chemistry & Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Yuxi Zhao
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Chemistry & Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Vinh T Nguyen
- Department of Chemistry & Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States
| | - Alexander M Spokoyny
- Department of Chemistry & Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Chemistry and the International Institute for Nanotechnology, Northwestern University , Evanston, Illinois 60208, United States
| | - Chad A Mirkin
- Department of Chemistry and the International Institute for Nanotechnology, Northwestern University , Evanston, Illinois 60208, United States
| | - Tomáš Baše
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, v.v.i. , č.p. 1001, 250 68 Husinec-Řež, Czech Republic
| | - Paul S Weiss
- California NanoSystems Institute, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Chemistry & Biochemistry, University of California, Los Angeles , Los Angeles, California 90095, United States.,Department of Materials Science & Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States
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12
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Recent experimental advances on hydrophobic interactions at solid/water and fluid/water interfaces. Biointerphases 2016; 11:018903. [DOI: 10.1116/1.4937465] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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13
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Baše T, Macháček J, Hájková Z, Langecker J, Kennedy JD, Carr MJ. Thermal isomerizations of monothiolated carboranes (HS)C 2 B 10 H 11 and the solid-state investigation of 9-(HS)-1,2-C 2 B 10 H 11 and 9-(HS)-1,7-C 2 B 10 H 11. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.06.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Thomas JC, Schwartz JJ, Hohman JN, Claridge SA, Auluck HS, Serino AC, Spokoyny AM, Tran G, Kelly KF, Mirkin CA, Gilles J, Osher SJ, Weiss PS. Defect-Tolerant Aligned Dipoles within Two-Dimensional Plastic Lattices. ACS NANO 2015; 9:4734-4742. [PMID: 25867638 DOI: 10.1021/acsnano.5b01329] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Carboranethiol molecules self-assemble into upright molecular monolayers on Au{111} with aligned dipoles in two dimensions. The positions and offsets of each molecule's geometric apex and local dipole moment are measured and correlated with sub-Ångström precision. Juxtaposing simultaneously acquired images, we observe monodirectional offsets between the molecular apexes and dipole extrema. We determine dipole orientations using efficient new image analysis techniques and find aligned dipoles to be highly defect tolerant, crossing molecular domain boundaries and substrate step edges. The alignment observed, consistent with Monte Carlo simulations, forms through favorable intermolecular dipole-dipole interactions.
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Affiliation(s)
- John C Thomas
- †Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Jeffrey J Schwartz
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- §Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - J Nathan Hohman
- †Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Shelley A Claridge
- †Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- ⊥Department of Chemistry and Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47904, United States
| | - Harsharn S Auluck
- †Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Andrew C Serino
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- ∥Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Alexander M Spokoyny
- †Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- ¶Department of Chemistry and the International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Giang Tran
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- #Department of Mathematics, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Kevin F Kelly
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- ▽Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
| | - Chad A Mirkin
- ¶Department of Chemistry and the International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
| | - Jerome Gilles
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- #Department of Mathematics, University of California, Los Angeles, Los Angeles, California 90095, United States
- ○Department of Mathematics and Statistics, San Diego State University, San Diego, California 92182, United States
| | - Stanley J Osher
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- #Department of Mathematics, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Paul S Weiss
- †Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- ‡California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
- ∥Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
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Direct and quantitative AFM measurements of the concentration and temperature dependence of the hydrophobic force law at nanoscopic contacts. J Colloid Interface Sci 2015; 446:244-51. [DOI: 10.1016/j.jcis.2015.01.032] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 01/15/2015] [Accepted: 01/15/2015] [Indexed: 12/30/2022]
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16
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Shi C, Cui X, Xie L, Liu Q, Chan DYC, Israelachvili JN, Zeng H. Measuring forces and spatiotemporal evolution of thin water films between an air bubble and solid surfaces of different hydrophobicity. ACS NANO 2015; 9:95-104. [PMID: 25514470 DOI: 10.1021/nn506601j] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A combination of atomic force microscopy (AFM) and reflection interference contrast microscopy (RICM) was used to measure simultaneously the interaction force and the spatiotemporal evolution of the thin water film between a bubble in water and mica surfaces with varying degrees of hydrophobicity. Stable films, supported by the repulsive van der Waals-Casimir-Lifshitz force were always observed between air bubble and hydrophilic mica surfaces (water contact angle, θ(w) < 5°) whereas bubble attachment occurred on hydrophobized mica surfaces. A theoretical model, based on the Reynolds lubrication theory and the augmented Young-Laplace equation including the effects of disjoining pressure, provided excellent agreement with experiment results, indicating the essential physics involved in the interaction between air bubble and solid surfaces can be elucidated. A hydrophobic interaction free energy per unit area of the form: WH(h) = -γ(1 - cos θ(w))exp(-h/D(H)) can be used to quantify the attraction between bubble and hydrophobized solid substrate at separation, h, with γ being the surface tension of water. For surfaces with water contact angle in the range 45° < θ(w) < 90°, the decay length DH varied between 0.8 and 1.0 nm. This study quantified the hydrophobic interaction in asymmetric system between air bubble and hydrophobic surfaces, and provided a feasible method for synchronous measurements of the interaction forces with sub-nN resolution and the drainage dynamics of thin films down to nm thickness.
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Affiliation(s)
- Chen Shi
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 2 V4, Canada
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