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Zhou J, Song D, Mergelsberg ST, Wang Y, Adhikari NM, Lahiri N, Zhao Y, Chen P, Wang Z, Zhang X, Rosso KM. Facet-dependent dispersion and aggregation of aqueous hematite nanoparticles. Sci Adv 2024; 10:eadi7494. [PMID: 38354235 PMCID: PMC10866548 DOI: 10.1126/sciadv.adi7494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 01/12/2024] [Indexed: 02/16/2024]
Abstract
Nanoparticle aggregates in solution controls surface reactivity and function. Complete dispersion often requires additive sorbents to impart a net repulsive interaction between particles. Facet engineering of nanocrystals offers an alternative approach to produce monodisperse suspensions simply based on facet-specific interaction with solvent molecules. Here, we measure the dispersion/aggregation of three morphologies of hematite (α-Fe2O3) nanoparticles in varied aqueous solutions using ex situ electron microscopy and in situ small-angle x-ray scattering. We demonstrate a unique tendency of (104) hematite nanoparticles to maintain a monodisperse state across a wide range of solution conditions not observed with (001)- and (116)-dominated particles. Density functional theory calculations reveal an inert, densely hydrogen-bonded first water layer on the (104) facet that favors interparticle dispersion. Results validate the notion that nanoparticle dispersions can be controlled through morphology for specific solvents, which may help in the development of various nanoparticle applications that rely on their interfacial area to be highly accessible in stable suspensions.
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Affiliation(s)
| | | | | | - Yining Wang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Narendra M. Adhikari
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Nabajit Lahiri
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Yatong Zhao
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Ping Chen
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Zheming Wang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Xin Zhang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Kevin M. Rosso
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
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Cimatu KLA, Premadasa UI, Ambagaspitiya TD, Adhikari NM, Jang JH. Evident phase separation and surface segregation of hydrophobic moieties at the copolymer surface using atomic force microscopy and SFG spectroscopy. J Colloid Interface Sci 2020; 580:645-659. [PMID: 32712471 DOI: 10.1016/j.jcis.2020.07.066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 07/12/2020] [Accepted: 07/13/2020] [Indexed: 11/18/2022]
Abstract
HYPOTHESIS Copolymers are developed to enhance the overall physical and chemical properties of polymers. The surface nature of a copolymer is relevant to creating efficient materials to improve adhesion and biocompatibility. We hypothesize that the improved adhesion, as a surface property, is due to phase separation, surface segregation, and the overall molecular organization of different polymer components at the copolymer surface. EXPERIMENTS The surface structure of a copolymer composed of 2-hydroxyethyl methacrylate (HEMA) monomer and 2-phenoxyethyl methacrylate (PhEMA) monomer was analyzed in comparison to the polyHEMA and polyPhEMA homopolymers using atomic force microscopy (AFM) and sum frequency generation (SFG) spectroscopy. FINDINGS The contrast in the phase images was due to the variance in the hydrophobic level provided by the hydroxyl and phenoxy modified monomers in the copolymer. The distribution of the adhesion values, supporting the presence of hydrophobic moieties, across the polymer surface defined the surface segregation of these two components. SFG spectra of the copolymer thin film showed combined spectral features of both polyHEMA and polyPhEMA thin films at the polymer surface. The tilt angles of the alpha-methyl group of homopolymers using the polarization intensity ratio analysis and the polarization mapping method were estimated to be in the range from 48° to 66°.
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Affiliation(s)
- Katherine Leslee A Cimatu
- Department of Chemistry and Biochemistry, Ohio University, 100 University Terrace, 136 Clippinger Laboratories, Athens, OH 45701-2979, United States.
| | - Uvinduni I Premadasa
- Department of Chemistry and Biochemistry, Ohio University, 100 University Terrace, 136 Clippinger Laboratories, Athens, OH 45701-2979, United States
| | - Tharushi D Ambagaspitiya
- Department of Chemistry and Biochemistry, Ohio University, 100 University Terrace, 136 Clippinger Laboratories, Athens, OH 45701-2979, United States
| | - Narendra M Adhikari
- Department of Chemistry and Biochemistry, Ohio University, 100 University Terrace, 136 Clippinger Laboratories, Athens, OH 45701-2979, United States
| | - Joon Hee Jang
- Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Avenue, Houston, TX 77030, United States
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Poel W, Brugman SJT, Ven KHA, Gasseling A, Lange J, Townsend ER, Engwerda AHJ, Jankowski M, Blijlevens MAR, Werkhoven BL, Drnec J, Carlà F, Felici R, Tuladhar A, Adhikari NM, De Yoreo JJ, Elemans JAAW, Enckevort WJP, Rowan AE, Vlieg E. Organothiol Monolayer Formation Directly on Muscovite Mica. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wester Poel
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Sander J. T. Brugman
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Kim H. A. Ven
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Anouk Gasseling
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Jordi Lange
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Eleanor R. Townsend
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Anthonius H. J. Engwerda
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | | | - Melian A. R. Blijlevens
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Ben L. Werkhoven
- Utrecht University Institute for Theoretical Physics Princetonplein 5 3584 CC Utrecht The Netherlands
| | | | | | | | - Aashish Tuladhar
- Physical Sciences Division Pacific Northwest National Laboratory Richland WA 99352 USA
| | - Narendra M. Adhikari
- Physical Sciences Division Pacific Northwest National Laboratory Richland WA 99352 USA
| | - James J. De Yoreo
- Physical Sciences Division Pacific Northwest National Laboratory Richland WA 99352 USA
| | - Johannes A. A. W. Elemans
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Willem J. P. Enckevort
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Alan E. Rowan
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
| | - Elias Vlieg
- Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525AJ Nijmegen The Netherlands
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de Poel W, Brugman SJT, van de Ven KHA, Gasseling A, de Lange J, Townsend ER, Engwerda AHJ, Jankowski M, Blijlevens MAR, Werkhoven BL, Drnec J, Carlà F, Felici R, Tuladhar A, Adhikari NM, De Yoreo JJ, Elemans JAAW, van Enckevort WJP, Rowan AE, Vlieg E. Organothiol Monolayer Formation Directly on Muscovite Mica. Angew Chem Int Ed Engl 2020; 59:2323-2327. [PMID: 31765512 PMCID: PMC7003791 DOI: 10.1002/anie.201913327] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Indexed: 11/23/2022]
Abstract
Organothiol monolayers on metal substrates (Au, Ag, Cu) and their use in a wide variety of applications have been extensively studied. Here, the growth of layers of organothiols directly onto muscovite mica is demonstrated using a simple procedure. Atomic force microscopy, surface X-ray diffraction, and vibrational sum-frequency generation IR spectroscopy studies revealed that organothiols with various functional endgroups could be self-assembled into (water) stable and adaptable ultra-flat organothiol monolayers over homogenous areas as large as 1 cm2 . The strength of the mica-organothiol interactions could be tuned by exchanging the potassium surface ions for copper ions. Several of these organothiol monolayers were subsequently used as a template for calcite growth.
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Affiliation(s)
- Wester de Poel
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Sander J. T. Brugman
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Kim H. A. van de Ven
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Anouk Gasseling
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Jordi de Lange
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Eleanor R. Townsend
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Anthonius H. J. Engwerda
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | | | - Melian A. R. Blijlevens
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Ben L. Werkhoven
- Utrecht UniversityInstitute for Theoretical PhysicsPrincetonplein 53584 CCUtrechtThe Netherlands
| | | | | | | | - Aashish Tuladhar
- Physical Sciences DivisionPacific Northwest National LaboratoryRichlandWA99352USA
| | - Narendra M. Adhikari
- Physical Sciences DivisionPacific Northwest National LaboratoryRichlandWA99352USA
| | - James J. De Yoreo
- Physical Sciences DivisionPacific Northwest National LaboratoryRichlandWA99352USA
| | - Johannes A. A. W. Elemans
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | | | - Alan E. Rowan
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
| | - Elias Vlieg
- Radboud UniversityInstitute for Molecules and MaterialsHeyendaalseweg 1356525AJNijmegenThe Netherlands
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Adhikari NM, Premadasa UI, Rudy ZJ, Cimatu KLA. Orientational Analysis of Monolayers at Low Surface Concentrations Due to an Increased Signal-to-Noise Ratio (S/N) Using Broadband Sum Frequency Generation Vibrational Spectroscopy. Appl Spectrosc 2019; 73:1146-1159. [PMID: 31131613 DOI: 10.1177/0003702819857139] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Sum frequency generation (SFG) * Equal contributors. spectroscopy was used to deduce the orientation of the terminal methyl (CH3) group of self-assembled monolayers (SAMs) at the air-solid and air-liquid interfaces at surface concentrations as low as 1% protonated molecules in the presence of 99% deuterated molecules. The SFG spectra of octadecanethiol (ODT) and deuterated octadecanethiol (d37 ODT) SAMs on gold were used for analysis at the air-solid interface. However, the eicosanoic acid (EA) and deuterated EA (d39 EA) SAMs on the water were analyzed at the air-liquid interface. The tilt angle of the terminal CH3 group was estimated to be ∼39 ° for a SAM of 1% ODT : 99% d37 ODT, whereas the tilt angle of the terminal CH3 group of the 1% EA : 99% d39 EA monolayer was estimated to be ∼32 °. The reliability of the orientational analysis at low concentrations was validated by testing the sensitivity of the SFG spectroscopy. A signal-to-noise (S/N) ratio of ∼60 and ∼45 was obtained for the CH3 symmetric stretch (SS) of 1% ODT : 99% d37 ODT and 1% EA : 99% d39 EA, respectively. The estimated increase in S/N ratio values, as a measure of the sensitivity of the SFG spectroscopy, verified the capacity to acquire the SFG spectra at low concentrations of interfacial molecules under ambient conditions. Overall, the orientational analysis of CH3 SS vibrational mode was feasible at low concentrations of protonated molecules due to increased S/N ratio. In support, the improved S/N ratio on varying incident power density of the visible beam was also experimentally demonstrated.
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Affiliation(s)
| | | | - Zachary J Rudy
- Department of Chemistry and Biochemistry, Ohio University, Athens, OH, USA
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Adhikari NM, Premadasa UI, Cimatu KLA. Sum frequency generation vibrational spectroscopy of methacrylate-based functional monomers at the hydrophilic solid–liquid interface. Phys Chem Chem Phys 2017; 19:21818-21828. [DOI: 10.1039/c7cp03113k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
An SFGVS study showed H-bonding interactions between the carbonyl groups of methacrylate liquid monomers and surface silanol groups of amorphous quartz.
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