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Liu Q, Peng Y, Masood Z, DuBois D, Tressel J, Nichols F, Ashby P, Mercado R, Assafa T, Pan D, Kuo HL, Lu JQ, Bridges F, Millhauser G, Ge Q, Chen S. Stable Cuprous Hydroxide Nanostructures by Organic Ligand Functionalization. Adv Mater 2023; 35:e2208665. [PMID: 36462218 PMCID: PMC9975062 DOI: 10.1002/adma.202208665] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/19/2022] [Indexed: 06/17/2023]
Abstract
Copper compounds have been extensively investigated for diverse applications. However, studies of cuprous hydroxide (CuOH) have been scarce due to structural metastability. Herein, a facile, wet-chemistry procedure is reported for the preparation of stable CuOH nanostructures via deliberate functionalization with select organic ligands, such as acetylene and mercapto derivatives. The resulting nanostructures are found to exhibit a nanoribbon morphology consisting of small nanocrystals embedded within a largely amorphous nanosheet-like scaffold. The acetylene derivatives are found to anchor onto the CuOH forming CuC linkages, whereas CuS interfacial bonds are formed with the mercapto ligands. Effective electronic coupling occurs at the ligand-core interface in the former, in contrast to mostly non-conjugated interfacial bonds in the latter, as manifested in spectroscopic measurements and confirmed in theoretical studies based on first principles calculations. Notably, the acetylene-capped CuOH nanostructures exhibit markedly enhanced photodynamic activity in the inhibition of bacteria growth, as compared to the mercapto-capped counterparts due to a reduced material bandgap and effective photocatalytic generation of reactive oxygen species. Results from this study demonstrate that deliberate structural engineering with select organic ligands is an effective strategy in the stabilization and functionalization of CuOH nanostructures, a critical first step in exploring their diverse applications.
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Affiliation(s)
- Qiming Liu
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Yi Peng
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Zaheer Masood
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Illinois 62901
| | - Davida DuBois
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - John Tressel
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Forrest Nichols
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Paul Ashby
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| | - Rene Mercado
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Tufa Assafa
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Dingjie Pan
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Han-Lin Kuo
- School of Engineering, University of California, 5200 North Lake Road, Merced, California 95343
| | - Jennifer Q. Lu
- School of Engineering, University of California, 5200 North Lake Road, Merced, California 95343
| | - Frank Bridges
- Department of Physics, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Glenn Millhauser
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
| | - Qingfeng Ge
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Illinois 62901
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064
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Gao S, Ji H, Yang P, Guo M, Tressel J, Chen S, Wang Q. High-Performance Photocatalytic Reduction of Nitrogen to Ammonia Driven by Oxygen Vacancy and Ferroelectric Polarization Field of SrBi 4 Ti 4 O 15 Nanosheets. Small 2023; 19:e2206114. [PMID: 36412072 DOI: 10.1002/smll.202206114] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Photo-responsive semiconductors can facilitate nitrogen activation and ammonia production, but the high recombination rate of photogenerated carriers represents a significant barrier. Ferroelectric photocatalysts show great promise in overcoming this challenge. Herein, by adopting a low-temperature hydrothermal procedure with varying concentrations of glyoxal as the reducing agent, oxygen vacancies (Vo) are effectively produced on the surface of ferroelectric SrBi4 Ti4 O15 (SBTO) nanosheets, which leads to a considerable increase in photocatalytic activity toward nitrogen fixation under simulated solar light with an ammonia production rate of 53.41 µmol g-1 h-1 , without the need of sacrificial agents or photosensitizers. This is ascribed to oxygen vacancies that markedly enhance the self-polarization and internal electric field of ferroelectric SBTO, and hence, facilitate the separation of photogenerated charge carriers and light trapping as well as N2 adsorption and activation, as compared to pristine SBTO. Consistent results are obtained in theoretical studies. Results from this study highlight the significance of surface oxygen vacancies in enhancing the performance of photocatalytic nitrogen fixation by ferroelectric catalysts.
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Affiliation(s)
- Shuai Gao
- Laboratory for Micro-sized Functional Materials and College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China
| | - Haodong Ji
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
| | - Peng Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, College of Chemistry and Materials Science, Northwest University, 1 Xuefu Ave., Xi'an, 710127, P. R. China
| | - Ming Guo
- Laboratory for Micro-sized Functional Materials and College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China
| | - John Tressel
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - Qiang Wang
- Laboratory for Micro-sized Functional Materials and College of Elementary Education and Department of Chemistry, Capital Normal University, Beijing, 100048, P. R. China
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Liu J, Cheng W, Zhang K, Liu H, Li J, Tressel J, Chen S. High-Efficiency Photodynamic Antibacterial Activity of NH 2-MIL-101(Fe)@MoS 2/ZnO Ternary Composites. ACS Appl Bio Mater 2022; 5:3912-3922. [PMID: 35921132 DOI: 10.1021/acsabm.2c00439] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bacterial infections are a serious threat to human health, and the development of effective antibacterial agents represents a critical solution. In this study, NH2-MIL-101(Fe)@MoS2/ZnO ternary nanocomposites are successfully prepared by a facile wet-chemistry procedure, where MoS2 nanosheets are grown onto the MIL-101 scaffold forming a flower-like morphology with ZnO nanoparticles deposited onto the surface. The ternary composites exhibit a remarkable sterilization performance under visible light irradiation toward both Gram-negative and Gram-positive bacteria, eliminating 98.6% of Escherichia coli and 90% of Staphylococcus aureus after exposure to visible light for 30 min, a performance markedly better than that with NH2-MIL-101(Fe)@MoS2 binary composites and even more so than MoS2 nanosheets alone. This is ascribed to the unique electronic band structure of the composites, where the separation of the photogenerated carriers is likely facilitated by the S-scheme mechanism in the NH2-MIL-101(Fe)@MoS2 binary composites and further enhanced by the formation of a p-n heterojunction between MoS2 and ZnO in the ternary composites. This interfacial charge transfer boosts the effective production of superoxide radicals by the reduction of oxygen, and the disproportionation reaction with water leads to the formation of hydroxy radicals, as attested in spectroscopic and microscopic measurements. Results from this study highlight the significance of structural engineering of nanocomposites in the manipulation of the electronic band structure and hence the photodynamic activity.
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Affiliation(s)
- Junli Liu
- School of Materials and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
| | - Wenxia Cheng
- School of Materials and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
| | - Kaitao Zhang
- School of Materials and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
| | - Hui Liu
- School of Materials and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
| | - Junqi Li
- School of Materials and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, China
| | - John Tressel
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 96064, United States
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 96064, United States
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Tressel J, Kashirtsev F, Cheung K, Simon J, Fried D. Caries inhibition of simulated active caries lesions with CO 2 laser irradiation and fluoride. Proc SPIE Int Soc Opt Eng 2022; 11942:119420B. [PMID: 35450400 PMCID: PMC9020385 DOI: 10.1117/12.2608308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
It has been well established that CO2 laser irradiation can be used to transform the mineral phase of dental enamel to make it more resistant to acid dissolution. The purpose of this study was to investigate if carbon dioxide laser irradiation and topical fluoride can be used to treat incipient caries lesions to inhibit further progression, i.e. treat active lesion surfaces as opposed to sound surfaces prior to subjecting them to an acid challenge. Simulated active caries lesions were produced on twenty eight bovine enamel samples using a pH cycling model and those surfaces were irradiated by a 9.4 μm CO2 laser and treated with topical fluoride. Changes in the surface morphology, acid resistance, and permeability were measured using digital microscopy, optical coherence tomography (OCT), and SWIR reflectance surface dehydration rate measurements at 1950 nm after exposure to a further acid challenge. There was a significant reduction (P < 0.05) of further lesion progression for lesion windows treated with CO2 laser irradiation followed by the application of an acidulated phosphate fluoride gel compared to the untreated lesion windows on each sample. Treatment by laser irradiation alone was not effective. The degree of lesion inhibition was not as high as has been previously observed for laser irradiated sound enamel surfaces exposed to an acid challenge.
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Affiliation(s)
- John Tressel
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Filipp Kashirtsev
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Kevin Cheung
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Jacob Simon
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Daniel Fried
- University of California, San Francisco, San Francisco, CA 94143-0758
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Abstract
Dental fluorosis is an increasing problem in the U.S. due to excessive exposure to fluoride from the environment. Fluorosis causes hypomineralization of the enamel during tooth development and mild fluorosis is visible as faint white lines on the tooth surface while the most severe fluorosis can result in pitted surfaces. It is difficult to differentiate lesions due to fluorosis from those due to caries. Dental fluorosis appears with extremely high contrast at short wavelength infrared (SWIR) wavelengths of 1450 and 1960 nm coincident with higher water absorption. In this study reflectance measurements at 1450 and 1950 nm were used to monitor the dehydration dynamics of lesions due to fluorosis on extracted teeth. The dehydration dynamics were compared with the lesion structure that was measured with microCT. Sixteen extracted teeth with suspected fluorosis were imaged and microCT showed that the mean surface zone thickness was 118 ± 30 μm and the lesion depth was 284 ± 105 μm for the areas of fluorosis investigated. The dehydration dynamics of lesions due to fluorosis appeared most similar to those of arrested caries lesions. There was no significant correlation (P >0.05) of the intensity change and rate of the intensity change at 1450 or 1950 nm with either the lesion surface zone thickness or the lesion depth.
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Affiliation(s)
- Filipp Kashirtsev
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - John Tressel
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Daniel Fried
- University of California, San Francisco, San Francisco, CA 94143-0758
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Chang NY, Tressel J, Kashirtsev F, Fried D. Use of SWIR dehydration and OCT to assess the complete arrest of simulated incipient caries lesions. Proc SPIE Int Soc Opt Eng 2022; 11942:119420A. [PMID: 35444361 PMCID: PMC9017390 DOI: 10.1117/12.2608297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Previous studies have shown that optical coherence tomography (OCT) can be used to show the formation of a transparent surface zone on caries lesions indicative of remineralization. Studies have also shown that monitoring changes in the diffuse reflectivity of caries lesions during drying with air can be used to assess lesion activity and that the largest changes occur at SWIR wavelengths coincident with high water absorption at 1450 and 1950 nm. The purpose of this study was to determine when remineralization has occurred by monitoring changes in SWIR reflectance measurements and OCT images of simulated lesions over an extended time period during exposure to a remineralization solution. Eight bovine enamel surfaces each with two treatment windows were exposed to a pH cycling regimen to produce simulated lesions 50-100 μm deep. OCT at 1310 nm was used to image the samples at each time point. An extended range tungsten halogen lamp with a 1450 nm band pass filter and a broadband amplified spontaneous emission source centered near the peak of the water-absorption band at 1950 nm were used as light sources. An extended range InGaAs camera (1000-2340 nm) was used to acquire reflected light images as the samples were dried with air. After 32 days of exposure to the remineralization solution there were no further changes to the samples suggesting they had been completely arrested.
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Affiliation(s)
- Nai-Yuan Chang
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - John Tressel
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Filipp Kashirtsev
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Daniel Fried
- University of California, San Francisco, San Francisco, CA 94143-0758
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Kashirtsev F, Tressel J, Simon JC, Fried D. High contrast imaging of dental fluorosis in the short wavelength infrared. J Biophotonics 2021; 14:e202100145. [PMID: 34302430 PMCID: PMC9380435 DOI: 10.1002/jbio.202100145] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 07/20/2021] [Accepted: 07/22/2021] [Indexed: 06/13/2023]
Abstract
Dental fluorosis is an increasing problem due to over exposure to fluoride from the environment. Fluorosis causes hypomineralization of the enamel during tooth development and mild fluorosis is visible as faint white lines on the tooth surface while the most severe fluorosis can result in pitted surfaces. It is difficult to quantify the severity of mild to moderate fluorosis and assessments are limited to subjective visual examinations. Dental fluorosis appears with very high contrast at short wavelength infrared (SWIR) wavelengths beyond 1400 nm and we hypothesize that these wavelengths may be better suited for detecting mild fluorosis and for estimating the severity on tooth surfaces. In this study, the contrast of fluorosis of varying severity on extracted human permanent teeth was measured at SWIR wavelengths ranging from 1300 to 2150 nm using an extended range of InGaAs camera and broadband light sources. The contrast was also measured in the visible range and with quantitative light-induced fluorescence (QLF) for comparison. The depth of hypomineralization and the integrated reflectivity were also measured with cross-polarization optical coherence tomography. The contrast of hypomineralization is significantly higher (P < 0.05) at 1460 and 1950 nm wavelengths than for the visible, fluorescence or other SWIR wavelengths from 1300 to 2150 nm. The highest correlation of the contrast with the depth of hypomineralization measured with cross-polarization-optical coherence tomography (CP-OCT) was at 1950 nm. This SWIR in vitro imaging study exploring wavelengths beyond 1400 nm has shown that hypomineralization on tooth surfaces can be viewed with extremely high contrast at SWIR wavelengths from 1460 to 2000 nm and that SWIR imaging has great potential for monitoring hypomineralization on tooth surfaces. New clinical methods are needed for the measurement of fluorosis that are valid, reliable, and feasible for surveillance at the community level. In addition, methods are needed for the quantitative assessment of fluorosis in vivo.
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Affiliation(s)
| | | | | | - Daniel Fried
- Correspondence Daniel Fried, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, California 94143-0758.
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Tressel J, Abdelaziz M, Fried D. High contrast reflectance imaging at 1950 nm for the assessment of lesion activity on extracted teeth. Proc SPIE Int Soc Opt Eng 2021; 11627. [PMID: 33762796 DOI: 10.1117/12.2584909] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Changes in the reflectivity of lesions on the proximal surfaces of extracted human teeth were measured at SWIR wavelengths from 1300-2000 nm as they were dried with air to assess lesion activity. An extended range tungsten-halogen lamp with bandpass filters of varying wavelength (bandwidth) 1300 nm (90), 1460 nm (85), 1535 nm (80), and 1675 nm (90) along with a broadband ASE source centered near the peak of the water-absorption band at 1950-nm were used as light sources and an extended range InGaAs camera (1000-2340 nm) was used to acquire reflected light images as the samples were dried with air. MicroCT images were used as a gold standard for comparison. SWIR light at 1950 nm yields extremely high contrast of demineralization and appears to be the optimum wavelength for the assessment of lesion activity on tooth coronal surfaces.
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Affiliation(s)
- John Tressel
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Marwa Abdelaziz
- University of California, San Francisco, San Francisco, CA 94143-0758
| | - Daniel Fried
- University of California, San Francisco, San Francisco, CA 94143-0758
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Mallick J, Scaife H, Strozewski K, Tressel J, Wendt J. A public health/hospital collaboration to develop a blueprint for hospital-based mass immunization clinics during bioterrorism events. Am J Infect Control 2005. [DOI: 10.1016/j.ajic.2005.04.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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