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Backus EHG, Hosseinpour S, Ramanan C, Sun S, Schlegel SJ, Zelenka M, Jia X, Gebhard M, Devi A, Wang HI, Bonn M. Ultrafast Surface-Specific Spectroscopy of Water at a Photoexcited TiO 2 Model Water-Splitting Photocatalyst. Angew Chem Int Ed Engl 2024; 63:e202312123. [PMID: 38010868 DOI: 10.1002/anie.202312123] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/31/2023] [Accepted: 11/24/2023] [Indexed: 11/29/2023]
Abstract
A critical step in photocatalytic water dissociation is the hole-mediated oxidation reaction. Molecular-level insights into the mechanism of this complex reaction under realistic conditions with high temporal resolution are highly desirable. Here, we use femtosecond time-resolved, surface-specific vibrational sum frequency generation spectroscopy to study the photo-induced reaction directly at the interface of the photocatalyst TiO2 in contact with liquid water at room temperature. Thanks to the inherent surface specificity of the spectroscopic method, we can follow the reaction of solely the interfacial water molecules directly at the interface at timescales on which the reaction takes place. Following the generation of holes at the surface immediately after photoexcitation of the catalyst with UV light, water dissociation occurs on a sub-20 ps timescale. The reaction mechanism is similar at pH 3 and 11. In both cases, we observe the conversion of H2 O into Ti-OH groups and the deprotonation of pre-existing Ti-OH groups. This study provides unique experimental insights into the early steps of the photo-induced dissociation processes at the photocatalyst-water interface, relevant to the design of improved photocatalysts.
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Affiliation(s)
- Ellen H G Backus
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090, Vienna, Austria
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Saman Hosseinpour
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Current address: Institute of Particle Technology (LFG), Friedrich-Alexander-Universität-Erlangen-Nürnberg (FAU), Cauerstraße 4, 91058, Erlangen, Germany
| | - Charusheela Ramanan
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands
| | - Shumei Sun
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Simon J Schlegel
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Moritz Zelenka
- University of Vienna, Faculty of Chemistry, Institute of Physical Chemistry, Währinger Straße 42, 1090, Vienna, Austria
| | - Xiaoyu Jia
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Maximilian Gebhard
- Inorganic Materials Chemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Anjana Devi
- Inorganic Materials Chemistry, Ruhr-University Bochum, Universitätsstraße 150, 44801, Bochum, Germany
| | - Hai I Wang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Nanophotonics, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC, Utrecht, The Netherlands
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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Schnabel T, Honke R, Schmid A, Mehling S, Göhring R, Simek O, Wolfram A, Wetterauer A, Springer C. Low-cost test rig for characterization of photocatalytic planar materials using photonically sized UV-A LED light sources. HardwareX 2023; 16:e00487. [PMID: 38020539 PMCID: PMC10663667 DOI: 10.1016/j.ohx.2023.e00487] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/18/2023] [Accepted: 10/26/2023] [Indexed: 12/01/2023]
Abstract
In the presented studies, a system for the characterization of planar photocatalysts was developed and tested. In the system, reference substances can be studied online with regard to their degradability and adsorption on photocatalytic materials. In order to perform accurate calculations of the quantum and photon efficiency of the catalysts, the LED arrays used were adjusted in their spacing by simulations so that a homogeneous light field is imaged on the catalysts. The system was tested with respect to measurement accuracy and reproducibility and the photocatalytic degradation of methylene blue, methyl orange and rhodamine B was investigated. Exemplarily, the reaction kinetics, photolysis and adsorption on the tested photocatalysts were determined for these compounds and the calculation was presented in detail. The exact construction plans and circuits as well as the sensors and their programming are presented in detail and should encourage other scientists to replicate the experimental setup, since especially in the field of photocatalysis research, often the results of publications cannot be compared with each other.
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Affiliation(s)
- Tobias Schnabel
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Robert Honke
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Andreas Schmid
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Simon Mehling
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Rene' Göhring
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Oldrich Simek
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Axel Wolfram
- Hof University of Applied Science, Alfons-Goppel Platz 1, 95028, Hof
| | - Andre Wetterauer
- Erfurt University of Applied Science, Altonaer Straße 25, 99085, Erfurt
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Al-Noaman AS, Rawlinson SF. Titanium Dioxide/Graphene Oxide Composite Coatings for 316 Stainless Steel Dental Implants. Eur J Prosthodont Restor Dent 2023; 31:358-372. [PMID: 37191577 DOI: 10.1922/ejprd_2511al-noaman15] [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] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Accepted: 03/21/2023] [Indexed: 05/17/2023]
Abstract
Stainless steel has been used in orthopedics and orthodontic fields. However, it cannot be used for fabrication of dental implants due to its inertness, low biocompatibility and weak resistance to corrosion. A composite coating of titanium oxide /graphene oxide has been prepared for stainless steel to improve its biological properties. Stainless steel discs were polished, cleaned and pre-treated with a mixture of HNO3 and HF acid for 15 min. The composite coating composed of TiO2 produced by sol-gel technique and doped with 0.75 wt% graphene oxide. XRD, SEM-EDX and AFM were employed to characterize the composite coating. The anti-bacterial action of the composite coating was investigated against S. aureus and E. coli. The corrosion resistance of coated and noncoated samples was assessed in SBF using electrochemical technique. Cytotoxicity was assessed using osteoblast-like cells. The wettability was determined by contact angle, and bioactivity assessed by immersion in SBF. The results revealed that the composite coating was dense with few micro-cracks, and was not cytotoxic to osteoblast-like cells. The composite coating reduced bacterial colonies and the corrosion rate of the steel was improved. The wettability of the sample was increased with the composite coating and apatite formation appeared after 21 days.
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Affiliation(s)
- A S Al-Noaman
- University of Babylon, College of Dentistry, Department of Oral surgery, Babylon city, Iraq
| | - S F Rawlinson
- Queen Mary University of London, School of Medicine and Dentistry, London, UK
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Lan K, Wei Q, Zhao D. Versatile Synthesis of Mesoporous Crystalline TiO 2 Materials by Monomicelle Assembly. Angew Chem Int Ed Engl 2022; 61:e202200777. [PMID: 35194915 DOI: 10.1002/anie.202200777] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Indexed: 11/10/2022]
Abstract
Mesoscale TiO2 structures have realized many technological applications-ranging from catalysis and biomedicine to energy storage and conversion-because of their large mesoporosities offering desirable accessibility and mass transport. Tailoring mesoporous TiO2 structures with novel mesoscopic and microscopic configurations is envisaged to offer ample opportunities for further applications. In this Review, we explain how to synthesize novel mesoporous TiO2 materials and present recent examples. An emphasis is placed on a "monomicelle assembly" strategy as an emerging and powerful approach to direct the formation of mesostructured TiO2 with precise control over its structural orientations and architectures. Furthermore, typical examples of mesoporous TiO2 for applications in batteries and photocatalysis are highlighted. The Review ends with an outlook towards the synthesis of mesoporous TiO2 with tailored architectures by self-assembly, which could pave the way for developing advanced energy conversion and storage devices.
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Affiliation(s)
- Kun Lan
- Laboratory of Advanced Materials, Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, P. R. China
| | - Qiulong Wei
- Department of Materials Science and Engineering, Fujian Key Laboratory of Materials Genome, Xiamen Key Laboratory of High Performance Metals and Materials, College of Materials, Xiamen University, Xiamen, 361005, P. R. China
| | - Dongyuan Zhao
- Laboratory of Advanced Materials, Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, P. R. China
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Zhang K, Li J, Zhai W, Li C, Zhu Z, Kang X, Liao M, Ye L, Kong T, Wang C, Zhao Y, Chen P, Gao Y, Wang B, Peng H. Boosting Cycling Stability and Rate Capability of Li-CO 2 Batteries via Synergistic Photoelectric Effect and Plasmonic Interaction. Angew Chem Int Ed Engl 2022; 61:e202201718. [PMID: 35192236 DOI: 10.1002/anie.202201718] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Indexed: 02/03/2023]
Abstract
Sluggish CO2 reduction/evolution kinetics at cathodes seriously impede the realistic applications of Li-CO2 batteries. Herein, synergistic photoelectric effect and plasmonic interaction are introduced to accelerate CO2 reduction/evolution reactions by designing a silver nanoparticle-decorated titanium dioxide nanotube array cathode. The incident light excites energetic photoelectrons/holes in titanium dioxide to overcome reaction barriers, and induces the intensified electric field around silver nanoparticles to enable effective separation/transfer of photogenerated carriers and a thermodynamically favorable reaction pathway. The resulting Li-CO2 battery demonstrates ultra-low charge voltage of 2.86 V at 0.10 mA cm-2 , good cycling stability with 86.9 % round-trip efficiency after 100 cycles, and high rate capability at 2.0 mA cm-2 . This work offers guidance on rational cathode design for advanced Li-CO2 batteries and beyond.
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Affiliation(s)
- Kun Zhang
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Jiaxin Li
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China.,Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany
| | - Weijie Zhai
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Chuanfa Li
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Zhengfeng Zhu
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Xinyue Kang
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Meng Liao
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Lei Ye
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Taoyi Kong
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Chuang Wang
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Yang Zhao
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, P. R. China
| | - Peining Chen
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Yue Gao
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Bingjie Wang
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
| | - Huisheng Peng
- State Key Laboratory of Molecular Engineering of Polymers, Laboratory of Advanced Materials, and Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China
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Vieira A, Vital N, Rolo D, Roque R, Gonçalves LM, Bettencourt A, Silva MJ, Louro H. Investigation of the genotoxicity of digested titanium dioxide nanomaterials in human intestinal cells. Food Chem Toxicol 2022; 161:112841. [PMID: 35093430 DOI: 10.1016/j.fct.2022.112841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 12/22/2021] [Accepted: 01/25/2022] [Indexed: 12/19/2022]
Abstract
The widespread use of titanium dioxide nanomaterials (TiO2 NMs) in food and consumer products such as toothpaste or food contact materials, suggests the relevance of human oral exposure to these nanomaterials (NMs) and raises the possibility of adverse effects in the gastrointestinal tract (GIT). We previously showed that the in vitro digestion of TiO2 NMs may increase their toxicity in intestinal cells. In this work, we analyzed the genotoxicity and the intracellular reactive oxygen species induction by physiologically relevant concentrations of three different TiO2 NMs (NM-102, NM-103 and NM-105) in Caco-2 and HT29-MTX-E12 intestinal cells, while considering the potential influence of the digestion process in the NMs' physiochemical characteristics. The results evidenced a DNA-damaging effect dependent on the NM, more relevant for the rutile/anatase NM-105, possibly due to its lower hydrodynamic size in the cells medium. In addition, the results of the micronucleus assay suggest effects on chromosomal integrity, an indicator of cancer risk, in the HT29-MTX-E12 cells, for all the tested TiO2 NMs, especially after the in vitro digestion. This work supports the evidence for concerns on the use of TiO2 NMs as a food additive, recently reported by EFSA, and for their use in applications in consumer products that may drive human exposure through ingestion.
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Affiliation(s)
- Adriana Vieira
- Department of Human Genetics, National Institute of Health Dr. Ricardo Jorge (INSA), Avenida Padre Cruz, 1649-016, Lisboa, Portugal.
| | - Nádia Vital
- Department of Human Genetics, National Institute of Health Dr. Ricardo Jorge (INSA), Avenida Padre Cruz, 1649-016, Lisboa, Portugal.
| | - Dora Rolo
- Department of Human Genetics, National Institute of Health Dr. Ricardo Jorge (INSA), Avenida Padre Cruz, 1649-016, Lisboa, Portugal.
| | - Rossana Roque
- Department of Human Genetics, National Institute of Health Dr. Ricardo Jorge (INSA), Avenida Padre Cruz, 1649-016, Lisboa, Portugal.
| | - Lídia M Gonçalves
- Research Institute for Medicine (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, 1649-003, Lisbon, Portugal.
| | - Ana Bettencourt
- Research Institute for Medicine (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, 1649-003, Lisbon, Portugal
| | - Maria João Silva
- Department of Human Genetics, National Institute of Health Dr. Ricardo Jorge (INSA), Avenida Padre Cruz, 1649-016, Lisboa, Portugal; ToxOmics-Centre for Toxicogenomics and Human Health, NOVA Medical School, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria, 130, 1169-056, Lisboa, Portugal.
| | - Henriqueta Louro
- Department of Human Genetics, National Institute of Health Dr. Ricardo Jorge (INSA), Avenida Padre Cruz, 1649-016, Lisboa, Portugal; ToxOmics-Centre for Toxicogenomics and Human Health, NOVA Medical School, Universidade NOVA de Lisboa, Campo dos Mártires da Pátria, 130, 1169-056, Lisboa, Portugal.
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Quirk JA, Miao B, Feng B, Kim G, Ohta H, Ikuhara Y, McKenna KP. Unveiling the Electronic Structure of Grain Boundaries in Anatase with Electron Microscopy and First-Principles Modeling. Nano Lett 2021; 21:9217-9223. [PMID: 34724619 DOI: 10.1021/acs.nanolett.1c03099] [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: 06/13/2023]
Abstract
Polycrystalline anatase titanium dioxide has drawn great interest, because of its potential applications in high-efficiency photovoltaics and photocatalysts. There has been speculation on the electronic properties of grain boundaries but little direct evidence, because grain boundaries in anatase are challenging to probe experimentally and to model. We present a combined experimental and theoretical study of anatase grain boundaries that have been fabricated by epitaxial growth on a bicrystalline substrate, allowing accurate atomic-scale models to be determined. The electronic structure in the vicinity of stoichiometric grain boundaries is relatively benign to device performance but segregation of oxygen vacancies introduces barriers to electron transport, because of the development of a space charge region. An intrinsically oxygen-deficient boundary exhibits charge trapping consistent with electron energy loss spectroscopy measurements. We discuss strategies for the synthesis of polycrystalline anatase in order to minimize the formation of such deleterious grain boundaries.
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Affiliation(s)
- James A Quirk
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Bin Miao
- Institute of Engineering Innovation, University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, 300130, China
| | - Bin Feng
- Institute of Engineering Innovation, University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Gowoon Kim
- Graduate School of Information Science and Technology, Hokkaido University, N14W9, Kita, Sapporo 060-0814, Japan
| | - Hiromichi Ohta
- Research Institute for Electronic Science, Hokkaido University, N20W10, Sapporo 001-0020, Japan
| | - Yuichi Ikuhara
- Institute of Engineering Innovation, University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
- Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Keith P McKenna
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
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Cho KH, Jeong MH, Park DS, Kim M, Kim J, Park JK, Han X, Hyun DY, Kim MC, Sim DS, Hong YJ, Kim JH, Ahn Y. Preclinical Evaluation of a Novel Polymer-free Everolimus-eluting Stent in a Mid-term Porcine Coronary Restenosis Model. J Korean Med Sci 2021; 36:e259. [PMID: 34664799 PMCID: PMC8524232 DOI: 10.3346/jkms.2021.36.e259] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 08/22/2021] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Titanium dioxide films exhibit good biocompatibility and may be effective as drug-binding matrices for drug-eluting stents. We conducted a mid-term evaluation of a novel polymer-free everolimus-eluting stent using nitrogen-doped titanium dioxide film deposition (TIGEREVOLUTION®) in comparison with a commercial durable polymer everolimus-eluting stent (XIENCE Alpine®) in a porcine coronary restenosis model. METHODS Twenty-eight coronary arteries from 14 mini-pigs were randomly allocated to TIGEREVOLUTION® stent and XIENCE Alpine® stent groups. The stents were implanted in the coronary artery at a 1.1-1.2:1 stent-to-artery ratio. Eleven stented coronary arteries in each group were finally analyzed using coronary angiography, optical coherence tomography, and histopathologic evaluation 6 months after stenting. RESULTS Quantitative coronary analysis showed no significant differences in the pre-procedural, post-procedural, and 6-month lumen diameters between the groups. In the volumetric analysis of optical coherence tomography at 6 months, no significant differences were observed in stent volume, lumen volume, and percent area stenosis between the groups. There were no significant differences in injury score, inflammation score, or fibrin score between the groups, although the fibrin score was zero in the TIGEREVOLUTION® stent group (0 vs. 0.07 ± 0.11, P = 0.180). CONCLUSION Preclinical evaluation, including optical coherence tomographic findings 6 months after stenting, demonstrated that the TIGEREVOLUTION® stent exhibited efficacy and safety comparable with the XIENCE Alpine® stent, supporting the need for further clinical studies on the TIGEREVOLUTION® stent.
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Affiliation(s)
- Kyung Hoon Cho
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Myung Ho Jeong
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea.
| | - Dae Sung Park
- Cardiovascular Research Center, Chonnam National University Hospital, Gwangju, Korea
| | - Moonki Kim
- Cardiovascular Research Center, Chonnam National University Hospital, Gwangju, Korea
| | - JungHa Kim
- Cardiovascular Research Center, Chonnam National University Hospital, Gwangju, Korea
| | | | - Xiongyi Han
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Dae Young Hyun
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
| | - Min Chul Kim
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea
| | - Doo Sun Sim
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea
| | - Young Joon Hong
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea
| | - Ju Han Kim
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea
| | - Youngkeun Ahn
- Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea
- Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea
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Cao X, Zhang T, DeLoid GM, Gaffrey MJ, Weitz KK, Thrall BD, Qian WJ, Demokritou P. Evaluation of the cytotoxic and cellular proteome impacts of food-grade TiO 2 (E171) using simulated gastrointestinal digestions and a tri-culture small intestinal epithelial model. NanoImpact 2020; 17:10.1016/j.impact.2019.100202. [PMID: 32133427 PMCID: PMC7055729 DOI: 10.1016/j.impact.2019.100202] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Engineered nanomaterials (ENMs) are widely used in the food industry; however, regulations for ENMs in food are still in the early stages of development due to insufficient health data. This study investigated the cytotoxicity and changes to the proteomic profile in an in vitro small intestinal epithelium model after exposure to digested food models containing the ubiquitous engineered particulate food additive, TiO2 (E171) with an average size around 110 nm. TiO2 at 0.75% or 1.5% (w/w) concentrations in either a fasting food model (FFM) or a standardized food model (SFM) based on American diet were digested using an in vitro oral-gastric-small intestinal simulator, and the resulting digestas were applied to a small intestinal epithelium tri-culture cellular model. Effects on cell layer integrity, cytotoxicity, and oxidative stress were assessed. In order to explore the impact on cellular processes beyond basic cytotoxicity, mass spectrometry-based quantitative proteomic analyses of control and exposed tri-culture cells was performed. TiO2 in FFM, but not in SFM, produced significant, dose-dependent cytotoxicity (24%, p<0.001), and at the higher dose caused significant oxidative stress (1.24-fold, p<0.01), indicative of a food matrix effect. No significant perturbations of the cellular proteome were observed with TiO2 in either FFM or SFM food models. However, proteins involved in energy metabolism and protein synthesis were up-regulated by digestas from SFM compared to those from FFM, indicative of a food matrix effect on the cellular proteome. Interestingly, the differences in profiles between the two food models was more pronounced in the presence of TiO2. Together, these results indicate that TiO2 in a fasting diet may be slightly cytotoxic, and that ingested TiO2 does not significantly alter the epithelial proteome, whereas the food matrix alone can have a dramatic effect on the proteome.
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Affiliation(s)
- Xiaoqiong Cao
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Tong Zhang
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Glen M. DeLoid
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Matthew J Gaffrey
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Karl K. Weitz
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Brian D. Thrall
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Wei-Jun Qian
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
- corresponding authors Philip Demokritou, , Wei-Jun Qian,
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
- corresponding authors Philip Demokritou, , Wei-Jun Qian,
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Angwarawong T, Kanjanamekanant K, Arksornnukit M, Pavasant P. Sol-Gel Fabricated Tio₂ Coating on Titanium Surface Promoted In Vitro Osteoblasts Differentiation. Eur J Prosthodont Restor Dent 2019; 27:145-153. [PMID: 31609100 DOI: 10.1922/ejprd_01919angwarawong09] [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] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Titanium has been used for biomedical devices due to its excellent biocompatibility, which is based partly on its 2-8 nm thick titanium oxide layer. However, the relatively poor surface hardness, wear resistance and metal release of these layers may cause some problems in clinical application. In this study, titanium surfaces were modified using a TiO₂ sol-gel coating, in order to improve surface properties and osteoblast function. No significant difference in surface roughness was observed between titanium and TiO₂ sol-gel discs. The surface of TiO₂ sol-gel discs possessed more wettability than titanium discs. The X-ray diffraction results showed amorphous TiO₂ phase on titanium discs, whereas TiO₂ sol-gel surfaces presented TiO₂ rutile and anatase phase. After 4 hours, the number of osteoblasts seeded on TiO₂ surface was significantly higher than those on titanium discs. The mRNA expression of bone sialoprotein and osteocalcin were also higher on day 5 and 7, respectively. Enzyme-linked immunosorbent assay(ELISA) analysis confirmed the increase of osteocalcin protein synthesis in osteoblasts grown on the TiO₂ sol-gel surface. Alizarin red-S staining showed higher amount of calcium deposition from osteoblasts cultured on TiO₂ surface than those on titanium discs at day 20. In conclusion, TiO₂ sol-gel coated-titanium could enhance osteoblasts differentiation and promote mineralization, indicating its potential in improving osseointegration for clinical application.
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Affiliation(s)
- T Angwarawong
- Department of Prosthodontics, Faculty of Dentistry, Khon Kaen University, Khon Kaen, 40002
| | - K Kanjanamekanant
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand
| | - M Arksornnukit
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand
| | - P Pavasant
- Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand.,Research unit of Mineralized Tissue, Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand
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Cao X, DeLoid GM, Bitounis D, De La Torre-Roche R, White JC, Zhang Z, Ho CG, Ng KW, Eitzer BD, Demokritou P. Co-exposure to the food additives SiO 2 (E551) or TiO 2 (E171) and the pesticide boscalid increases cytotoxicity and bioavailability of the pesticide in a tri-culture small intestinal epithelium model: Potential health implications. Environ Sci Nano 2019; 6:2786-2800. [PMID: 32133147 PMCID: PMC7055717 DOI: 10.1039/c9en00676a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Many toxicity investigations have evaluated the potential health risks of ingested engineered nanomaterials (iENMs); however, few have addressed the potential combined effects of iENMs and other toxic compounds (e.g. pesticides) in food. To address this knowledge gap, we investigated the effects of two widely used, partly nanoscale, engineered particulate food additives, TiO2 (E171) and SiO2 (E551), on the cytotoxicity and cellular uptake and translocation of the pesticide boscalid. Fasting food model (phosphate buffer) containing iENM (1% w/w), boscalid (10 or 150 ppm), or both, was processed using a simulated in vitro oral-gastric-small intestinal digestion system. The resulting small intestinal digesta was applied to an in vitro tri-culture small intestinal epithelium model, and effects on cell layer integrity, viability, cytotoxicity and production of reactive oxygen species (ROS) were assessed. Boscalid uptake and translocation was also quantified by LC/MS. Cytotoxicity and ROS production in cells exposed to combined iENM and boscalid were greater than in cells exposed to either iENM or boscalid alone. More importantly, translocation of boscalid across the tri-culture cellular layer was increased by 20% and 30% in the presence of TiO2 and SiO2, respectively. One possible mechanism for this increase is diminished epithelial cell health, as indicated by the elevated oxidative stress and cytotoxicity observed in co-exposed cells. In addition, analysis of boscalid in digesta supernatants revealed 16% and 30% more boscalid in supernatants from samples containing TiO2 and SiO2, respectively, suggesting that displacement of boscalid from flocculated digestive proteins by iENMs may also contribute to the increased translocation.
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Affiliation(s)
- Xiaoqiong Cao
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Glen M. DeLoid
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Dimitrios Bitounis
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Roberto De La Torre-Roche
- Department of Analytical Chemistry, Connecticut Agricultural Experiment Station, New Haven, CT 06504, USA
| | - Jason C. White
- Department of Analytical Chemistry, Connecticut Agricultural Experiment Station, New Haven, CT 06504, USA
| | - Zhenyuan Zhang
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
| | - Chin Guan Ho
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
| | - Kee Woei Ng
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
- Environmental Chemistry and Materials Centre, Nanyang Environment & Water Research Institute, CleanTech One, Singapore 637141
| | - Brian D. Eitzer
- Department of Analytical Chemistry, Connecticut Agricultural Experiment Station, New Haven, CT 06504, USA
| | - Philip Demokritou
- Center for Nanotechnology and Nanotoxicology, Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, MA 02115, USA
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
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Elnagar AMB, Ibrahim A, Soliman AM. Histopathological Effects of Titanium Dioxide Nanoparticles and The Possible Protective Role of N-Acetylcysteine on The Testes of Male Albino Rats. Int J Fertil Steril 2018; 12:249-256. [PMID: 29935072 PMCID: PMC6018179 DOI: 10.22074/ijfs.2018.5389] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 12/17/2017] [Indexed: 11/04/2022]
Abstract
BACKGROUND Titanium dioxide (TiO2) is a white pigment which is used in paints, plastics, etc. It is reported that TiO2 induces oxidative stress and DNA damage. N-acetylcysteine (NAC) has been used to fight oxidative stress-induced damage in different tissues. The objective of this study was to evaluate the toxic effects of orally administered TiO2 nanoparticles and the possible protective effect of NAC on the testes of adult male albino rats. MATERIALS AND METHODS In this experimental study, 50 adult male albino rats were classified into five groups. Group I was the negative control, group II was treated with gum acacia solution , group III was treated with NAC, group IV was treated with TiO2 nanoparticles, and group V was treated with 100 mg/kg of NAC and 1200 mg/kg TiO2 nanoparticles. Total testosterone, glutathione (GSH), and serum malondialdehyde (MDA) levels were estimated. The testes were subjected to histopathological, electron microscopic examinations, and immunohistochemical detection for tumor necrosis factor (TNF)-α. Cells from the left testis were examined to detect the degree of DNA impairment by using the comet assay. RESULTS TiO2 nanoparticles induced histopathological and ultrastructure changes in the testes as well as positive TNF-α immunoreaction in the testicular tissue. Moreover, there was an increase in serum MDA while a decrease in testosterone and GSH levels in TiO2 nanoparticles-treated group. TiO2 resulted in DNA damage. Administration of NAC to TiO2- treated rats led to improvement of the previous parameters with modest protective effects against DNA damage. CONCLUSION TiO2-induced damage to the testes was mediated by oxidative stress. Notably, administration of NAC protected against TiO2's damaging effects.
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Affiliation(s)
- Amir M Bassam Elnagar
- Department of Histology, Faculty of Medicine, Al-Azhar University, Assiut, Egypt.,Department of Pathology, Insaniah University, Kuala Ketil Kedah, Darul Aman, Malaysia
| | - Abdelnasser Ibrahim
- Forensic Unit, Department of Pathology, National University of Malaysia Medical Centre, Jalan Yaakob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia.,Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Amro Mohamed Soliman
- Department of Anatomy, National University of Malaysia Medical Centre, Jalan Yaakob Latif, Bandar Tun Razak, Kuala Lumpur, Malaysia. Electronic Address:
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Nithyavathy N, Arunmetha S, Dhineshbabu NR, Panday MS, Rajendran V. Synthesis and Characterisation of Nanocomposites of TiO₂ and MgAl₂O₄ for Gas Sensing Applications. J Nanosci Nanotechnol 2017; 17:1307-1320. [PMID: 29683566 DOI: 10.1166/jnn.2017.12678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this study, a conventional mixed oxide method was used to prepare nanocomposites of titanium dioxide and magnesium aluminate samples. The synthesis process of a low concentration of posttransition metal oxide like TiO2 with pre-transition metal oxides like MgO and Al₂O3 and its gas sensing behaviour were investigated. The present work focuses on applying different nanocomposite samples of (TiO2) x and MgAl₂O₄ (at x = 0 magnesium aluminate namely MA; x = 0°25 and 0.75 N namely MAT0.25 and MAT0.75 at 4 and 10 wt% of TiO2 in MgAl₂O₄ respectively and TiO₂ namely T) for gas sensing applications (O₂, CO and H₂ gases). The composite samples were characterized by their X-ray diffraction pattern, Fourier transform infrared spectroscopy, a particle size analyzer, X-ray fluorescent spectroscopy, scanning electron microscopy, ultraviolet visible spectroscopy, and Brunauer–Emmett–Teller methods. The response to changes in gas pressure (from 0.5 to 2 bar) was quantitatively studied in all samples (MA, MAT0.25, MAT0.75 and T) at different operating temperatures from 300 to 600 K. All samples showed a fast and improved gas response at different operating temperatures. Moreover, it was observed that the gas response of the composite sample, MAT0.75 increased by 11% more than the pure titanium sample at an operating temperature of 360 K, on the passage of O₂ gas.
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Abstract
Objective: There is a wide application of titanium dioxide (TiO2) nanoparticles (NPs) in
industry. These particles are used in various products, and they also has biological effects
on cells and organs through direct contact. Materials and Methods: In this experimental research, the effect of TiO2 on chondrogenesis
of forelimb buds of mice embryos was assessed in in vivo condition. Concentrations
of 30, 150 and 500 mg/kg body weight (BW) TiO2 NPs (20 nm size) dissolved in distilled
water were injected intraperitoneally to Naval Medical Research Institute (NMRI) mice on
day 11.5 of gestation. On day 15, limb buds were amputated from the embryos and skeletogeneis
of limb buds were studied. Results: TiO2 NPs caused the significant changes in chondrocytes in the following developmental
stages: resting, proliferating, hypertrophy, degenerating, perichondrium and
mesenchymal cells. Decreased number of mesenchymal cells and increased level of
chondrocytes were observed after the injection of different concentrations of TiO2, which
proves the unpredictable effects of TiO2 on limb buds. Conclusion: Results of the present study showed TiO2 NPs accelerated the chondrogenesis
of limb buds, but further studies are recommended to predict TiO2 toxicity effects on
organogenesis.
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Affiliation(s)
- Kazem Parivar
- Department of Biology, Faculty of Science, Islamic Azad University, Science and Research Branch, Tehran, Iran
| | - Nasim Hayati Rudbari
- Department of Biology, Faculty of Science, Islamic Azad University, Science and Research Branch, Tehran, Iran
| | - Ramazan Khanbabaee
- Department of Biology, Faculty of Science, Islamic Azad University, Ghaemshahr, Mazandaran, Iran
| | - Mahya Khaleghi
- Department of Biology, Faculty of Science, Islamic Azad University, Ghaemshahr, Mazandaran, Iran
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