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Vora K, Kordas N, Seidl K. Label-Free, Impedance-Based Biosensor for Kidney Disease Biomarker Uromodulin. Sensors (Basel) 2023; 23:9696. [PMID: 38139542 PMCID: PMC10747639 DOI: 10.3390/s23249696] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 11/27/2023] [Accepted: 11/30/2023] [Indexed: 12/24/2023]
Abstract
We demonstrate the development of a label-free, impedance-based biosensor by using a passivation layer of 50-nm tantalum pentoxide (Ta2O5) on interdigitated electrodes (IDE). This layer was fabricated by atomic layer deposition (ALD) and has a high dielectric constant (high-κ), which improves the capacitive property of the IDE. We validate the biosensor's performance by measuring uromodulin, a urine biomarker for kidney tubular damage, from artificial urine samples. The passivation layer is functionalized with uromodulin antibodies for selective binding. The passivated IDE enables the non-faradaic impedance measurement of uromodulin concentrations with a measurement range from 0.5 ng/mL to 8 ng/mL and with a relative change in impedance of 15 % per ng/mL at a frequency of 150 Hz (log scale). This work presents a concept for point-of-care biosensing applications for disease biomarkers.
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Affiliation(s)
- Kunj Vora
- Fraunhofer Institute for Microelectronic Circuits and Systems, 47057 Duisburg, Germany; (N.K.); (K.S.)
| | - Norbert Kordas
- Fraunhofer Institute for Microelectronic Circuits and Systems, 47057 Duisburg, Germany; (N.K.); (K.S.)
| | - Karsten Seidl
- Fraunhofer Institute for Microelectronic Circuits and Systems, 47057 Duisburg, Germany; (N.K.); (K.S.)
- Department of Electronic Components and Circuits, University of Duisburg-Essen, Forsthausweg 2, 47057 Duisburg, Germany
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2
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Egorikhina MN, Bokov AE, Charykova IN, Rubtsova YP, Linkova DD, Kobyakova II, Farafontova EA, Kalinina SY, Kolmogorov YN, Aleynik DY. Biological Characteristics of Polyurethane-Based Bone-Replacement Materials. Polymers (Basel) 2023; 15. [PMID: 36850115 DOI: 10.3390/polym15040831] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/27/2023] [Accepted: 02/03/2023] [Indexed: 02/11/2023] Open
Abstract
A study is presented on four polymers of the polyurethane family, obtained using a two-stage process. The first composition is the basic polymer; the others differ from it by the presence of a variety of fillers, introduced to provide radiopacity. The fillers used were 15% bismuth oxide (Composition 2), 15% tantalum pentoxide (Composition 3), or 15% zirconium oxide (Composition 4). Using a test culture of human fibroblasts enabled the level of cytotoxicity of the compositions to be determined by MTT (3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide) assay, along with variations in the characteristics of the cells resulting from their culture directly on the specimens. The condition of cells on the surfaces of the specimens was assessed using fluorescence microscopy. It was shown that introducing 15% bismuth, tantalum, or zinc compounds as fillers produced a range of effects on the biological characteristics of the compositions. With the different fillers, the levels of toxicity differed and the cells' proliferative activity or adhesion was affected. However, in general, all the studied compositions may be considered cytocompatible in respect of their biological characteristics and are promising for further development as bases for bone-substituting materials. The results obtained also open up prospects for further investigations of polyurethane compounds.
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Lin HN, Wang LC, Chen MS, Chang PJ, Lin PY, Fang A, Chen CY, Lee PY, Lin CK. Discoloration Improvement by Mechanically-Milled Binary Oxides as Radiopacifier for Mineral Trioxide Aggregates. Materials (Basel) 2022; 15:7934. [PMID: 36431419 PMCID: PMC9695230 DOI: 10.3390/ma15227934] [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: 09/30/2022] [Revised: 11/02/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Mineral trioxide aggregates (MTA) have been widely used in endodontic treatments, but after some time, patients suffer tooth discoloration due to the use of bismuth oxide (Bi2O3) as a radiopacifier. Replacement of Bi2O3 with high energy ball-milled single (zirconia ZrO2; hafnia, HfO2; or tantalum pentoxide, Ta2O5) or binary oxide powder was attempted, and corresponding discoloration improvement was investigated in the present study. Bi2O3-free MTA is expected to exhibit superior discoloration. The radiopacity, diametral tensile strength, and discoloration of MTA-like cements prepared from the as-milled powder were investigated. Experimental results showed that MTA-like cements prepared using Ta2O5 exhibited a slightly higher radiopacity than that of HfO2 but had a much higher radiopacity than ZrO2. Milling treatment (30 min to 3 h) did not affect the radiopacities significantly. These MTA-like cements exhibited superior color stability (all measured ΔE00 < 1.0) without any perceptible differences after UV irradiation. MTA-like cements prepared using ZrO2 exhibited the best color stability but the lowest radiopacity, which can be improved by introducing binary oxide. Among the investigated samples, MTA-like cement using (ZrO2)50(Ta2O5)50 exhibited excellent color stability and the best overall performance with a radiopacity of 3.25 mmAl and a diametral tensile strength of 4.39 MPa.
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Affiliation(s)
- Hsiu-Na Lin
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Dentistry, Chang Gung Memorial Hospital, Taipei 105, Taiwan
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Ling-Chi Wang
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Center of Dental Technology, Chang Gung Memorial Hospital, Linkou, Taoyuan 333, Taiwan
| | - May-Show Chen
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Division of Prosthodontics, Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
| | - Pei-Jung Chang
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan
| | - Pin-Yu Lin
- Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 202, Taiwan
| | - Alex Fang
- Department of Engineering Technology and Industrial Distribution, Texas A & M University, College Station, TX 77843, USA
| | - Chin-Yi Chen
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Materials Science and Engineering, Feng Chia University, Taichung 407, Taiwan
| | - Pee-Yew Lee
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 202, Taiwan
| | - Chung-Kwei Lin
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
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Lühder TAK, Chemnitz M, Schneidewind H, Schartner EP, Ebendorff‐Heidepriem H, Schmidt MA. Tailored Multi-Color Dispersive Wave Formation in Quasi-Phase-Matched Exposed Core Fibers. Adv Sci (Weinh) 2022; 9:e2103864. [PMID: 35038237 PMCID: PMC8922130 DOI: 10.1002/advs.202103864] [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] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 12/01/2021] [Indexed: 06/14/2023]
Abstract
Widely wavelength-tunable femtosecond light sources in a compact, robust footprint play a central role in many prolific research fields and technologies, including medical diagnostics, biophotonics, and metrology. Fiber lasers are on the verge in the development of such sources, yet widespan spectral tunability of femtosecond pulses remains a pivotal challenge. Dispersive wave generation, also known as Cherenkov radiation, offers untapped potentials to serve these demands. In this work, the concept of quasi-phase matching for multi-order dispersive wave formation with record-high spectral fidelity and femtosecond durations is exploited in selected, partially conventionally unreachable spectral regions. Versatile patterned sputtering is utilized to realize height-modulated high-index nano-films on exposed fiber cores to alter fiber dispersion to an unprecedented degree through spatially localized, induced resonances. Nonlinear optical experiments and simulations, as well as phase-mismatching considerations based on an effective dispersion, confirm the conversion process and reveal unique emission features, such as almost power-independent wavelength stability and femtosecond duration. This resonance-empowered approach is applicable to both fiber and on-chip photonic systems and paves the way to instrumentalize dispersive wave generation as a unique tool for efficient, coherent femtosecond multi-frequency conversion for applications in areas such as bioanalytics, life science, quantum technology, or metrology.
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Affiliation(s)
- Tilman A. K. Lühder
- Leibniz Institute of Photonic TechnologyAlbert‐Einstein‐Str. 9Jena07745Germany
| | - Mario Chemnitz
- Institut National de la Recherche ScientifiqueCentre Énergie Matériaux Télécommunications1650 Boulevard Lionel‐BouletVarennesQuebecJ3X 1S2Canada
| | - Henrik Schneidewind
- Leibniz Institute of Photonic TechnologyAlbert‐Einstein‐Str. 9Jena07745Germany
| | - Erik P. Schartner
- School of Physical Sciences and ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP) and Institute for Photonics and Advanced Sensing (IPAS)The University of AdelaideAdelaideSA5005Australia
| | - Heike Ebendorff‐Heidepriem
- School of Physical Sciences and ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP) and Institute for Photonics and Advanced Sensing (IPAS)The University of AdelaideAdelaideSA5005Australia
| | - Markus A. Schmidt
- Leibniz Institute of Photonic TechnologyAlbert‐Einstein‐Str. 9Jena07745Germany
- Otto Schott Institute of Material ResearchFraunhoferstr. 6Jena07743Germany
- Abbe School of Photonics and Physics FacultyFriedrich Schiller UniversityJena07743Germany
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Lin HN, Lin CK, Chang PJ, Chang WM, Fang A, Chen CY, Yu CC, Lee PY. Effect of Tantalum Pentoxide Addition on the Radiopacity Performance of Bi 2O 3/Ta 2O 5 Composite Powders Prepared by Mechanical Milling. Materials (Basel) 2021; 14:ma14237447. [PMID: 34885606 PMCID: PMC8659089 DOI: 10.3390/ma14237447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/29/2021] [Accepted: 12/01/2021] [Indexed: 12/11/2022]
Abstract
Among the various phases of bismuth oxide, the high temperature metastable face-centered cubic δ phase attracts great attention due to its unique properties. It can be used as an ionic conductor or an endodontic radiopacifying material. However, no reports concerning tantalum and bismuth binary oxide prepared by high energy ball milling and serving as a dental radiopacifier can be found. In the present study, Ta2O5-added Bi2O3 composite powders were mechanically milled to investigate the formation of these metastable phases. The as-milled powders were examined by X-ray diffraction and scanning electron microscopy to reveal the structural evolution. The as-milled composite powders then served as the radiopacifier within mineral trioxide aggregates (i.e., MTA). Radiopacity performance, diametral tensile strength, setting times, and biocompatibility of MTA-like cements solidified by deionized water, saline, or 10% calcium chloride solution were investigated. The experimental results showed that subsequent formation of high temperature metastable β-Bi7.8Ta0.2O12.2, δ-Bi2O3, and δ-Bi3TaO7 phases can be observed after mechanical milling of (Bi2O3)95(Ta2O5)5 or (Bi2O3)80(Ta2O5)20 powder mixtures. Compared to its pristine Bi2O3 counterpart with a radiopacity of 4.42 mmAl, long setting times (60 and 120 min for initial and final setting times) and 84% MG-63 cell viability, MTA-like cement prepared from (Bi2O3)95(Ta2O5)5 powder exhibited superior performance with a radiopacity of 5.92 mmAl (the highest in the present work), accelerated setting times (the initial and final setting time can be shortened to 25 and 40 min, respectively), and biocompatibility (94% cell viability).
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Affiliation(s)
- Hsiu-Na Lin
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- Department of Dentistry, Chang Gung Memorial Hospital, Taipei 110, Taiwan
| | - Chung-Kwei Lin
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Pei-Jung Chang
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 111, Taiwan
| | - Wei-Min Chang
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
| | - Alex Fang
- Department of Engineering Technology and Industrial Distribution, Texas A&M University, College Station, TX 77843, USA;
| | - Chin-Yi Chen
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- Department of Materials Science and Engineering, Feng Chia University, Taichung 407, Taiwan
| | - Chia-Chun Yu
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- Center of Dental Technology, Chang Gung Memorial Hospital, Linkou, Taoyuan 333, Taiwan
- Correspondence: (C.-C.Y.); (P.-Y.L.)
| | - Pee-Yew Lee
- Research Center of Digital Oral Science and Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan; (H.-N.L.); (C.-K.L.); (P.-J.C.); (W.-M.C.); (C.-Y.C.)
- Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 202, Taiwan
- Correspondence: (C.-C.Y.); (P.-Y.L.)
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6
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Sánta B, Balogh Z, Pósa L, Krisztián D, Török TN, Molnár D, Sinkó C, Hauert R, Csontos M, Halbritter A. Noise Tailoring in Memristive Filaments. ACS Appl Mater Interfaces 2021; 13:7453-7460. [PMID: 33533590 PMCID: PMC7899176 DOI: 10.1021/acsami.0c21156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 01/25/2021] [Indexed: 06/12/2023]
Abstract
In this study, the possibilities of noise tailoring in filamentary resistive switching memory devices are investigated. To this end, the resistance and frequency scaling of the low-frequency 1/f-type noise properties are studied in representative mainstream material systems. It is shown that the overall noise floor is tailorable by the proper material choice, as demonstrated by the order-of-magnitude smaller noise levels in Ta2O5 and Nb2O5 transition-metal oxide memristors compared to Ag-based devices. Furthermore, the variation of the resistance states allows orders-of-magnitude tuning of the relative noise level in all of these material systems. This behavior is analyzed in the framework of a point-contact noise model highlighting the possibility for the disorder-induced suppression of the noise contribution arising from remote fluctuators. These findings promote the design of multipurpose resistive switching units, which can simultaneously serve as analog-tunable memory elements and tunable noise sources in probabilistic computing machines.
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Affiliation(s)
- Botond Sánta
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- MTA-BME Condensed Matter Research
Group, Budafoki út 8, 1111 Budapest,
Hungary
| | - Zoltán Balogh
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- MTA-BME Condensed Matter Research
Group, Budafoki út 8, 1111 Budapest,
Hungary
| | - László Pósa
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- Institute of Technical Physics and
Materials Science, Centre for Energy Research, Konkoly-Thege M. út
29-33, 1121 Budapest, Hungary
| | - Dávid Krisztián
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
| | - Tímea Nóra Török
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- MTA-BME Condensed Matter Research
Group, Budafoki út 8, 1111 Budapest,
Hungary
| | - Dániel Molnár
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- MTA-BME Condensed Matter Research
Group, Budafoki út 8, 1111 Budapest,
Hungary
| | - Csaba Sinkó
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
| | - Roland Hauert
- Laboratory for Joining Technologies & Corrosion,
Empa, Swiss Federal Laboratories for Materials Science and
Technology, Überlandstrasse 129, CH-8600 Dübendorf,
Switzerland
| | - Miklós Csontos
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- Transport at Nanoscale Interfaces Laboratory,
Empa, Swiss Federal Laboratories for Materials Science and
Technology, Überlandstrasse 129, CH-8600 Dübendorf,
Switzerland
| | - András Halbritter
- Department of Physics, Budapest
University of Technology and Economics, Budafoki út 8, 1111
Budapest, Hungary
- MTA-BME Condensed Matter Research
Group, Budafoki út 8, 1111 Budapest,
Hungary
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7
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Pang Z, Pan Z, Ma M, Xu Z, Mei S, Jiang Z, Yin F. Nanostructured Coating of Non-Crystalline Tantalum Pentoxide on Polyetheretherketone Enhances RBMS Cells/HGE Cells Adhesion. Int J Nanomedicine 2021; 16:725-740. [PMID: 33542627 PMCID: PMC7853447 DOI: 10.2147/ijn.s286643] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Accepted: 12/23/2020] [Indexed: 01/15/2023] Open
Abstract
PURPOSE As a dental material, polyetheretherketone (PEEK) is bioinert that does not induce cellular response and bone/gingival tissues regeneration. This study was to develop bioactive coating on PEEK and investigate the effects of coating on cellular response. MATERIALS AND METHODS Tantalum pentoxide (TP) coating was fabricated on PEEK surface by vacuum evaporation and responses of rat bone marrow mesenchymal stem (RBMS) cells/human gingival epithelial (HGE) were studied. RESULTS A dense coating (around 400 nm in thickness) of TP was closely combined with PEEK (PKTP). Moreover, the coating was non-crystalline TP, which contained many small humps (around 10 nm in size), exhibiting a nanostructured surface. In addition, the roughness, hydrophilicity, surface energy, and protein adsorption of PKTP were remarkably higher than that of PEEK. Furthermore, the responses (adhesion, proliferation, and osteogenic gene expression) of RBMS cells, and responses (adhesion and proliferation) of HGE cells to PKTP were remarkably improved in comparison with PEEK. It could be suggested that the nanostructured coating of TP on PEEK played crucial roles in inducing the responses of RBMS/HGE cells. CONCLUSION PKTP with elevated surface performances and outstanding cytocompatibility might have enormous potential for dental implant application.
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Affiliation(s)
- Zhiying Pang
- Department of Joint Surgery, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai200092, People’s Republic of China
| | - Zhangyi Pan
- Department of Joint Surgery, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai200092, People’s Republic of China
| | - Min Ma
- Department of Joint Surgery, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai200092, People’s Republic of China
| | - Zhiyan Xu
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai200237, People’s Republic of China
| | - Shiqi Mei
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai200237, People’s Republic of China
| | - Zengxin Jiang
- Department of Orthopedic Surgery, Zhongshan Hospital, Fudan University, Shanghai200032, People’s Republic of China
| | - Feng Yin
- Department of Joint Surgery, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai200092, People’s Republic of China
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Ding Z, Wang Y, Zhou Q, Ding Z, Liu J, He Q, Zhang H. Microstructure, Wettability, Corrosion Resistance and Antibacterial Property of Cu-MTa 2O 5 Multilayer Composite Coatings with Different Cu Incorporation Contents. Biomolecules 2019; 10:E68. [PMID: 31906220 PMCID: PMC7022678 DOI: 10.3390/biom10010068] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/29/2019] [Accepted: 12/29/2019] [Indexed: 12/21/2022] Open
Abstract
Bacterial infection and toxic metal ions releasing are the challenges in the clinical application of Ti6Al4V alloy implant materials. Copper is a kind of long-acting, broad-spectrum and safe antibacterial element, and Ta2O5 has good corrosion resistance, wear-resistance and biocompatibility, they are considered and chosen as a potential coating candidate for implant surface modification. In this paper, magnetron sputtering technology was used to prepare copper doped Ta2O5 multilayer composite coating Cu-Ta2O5/Ta2O5/Ta2O5-TiO2/TiO2/Ti (Cu-MTa2O5 for short) on Ti6Al4V alloy surface, for studying the effect of copper incorporation on the microstructure, wettability, anticorrosion and antibacterial activities of the composite coating. The results showed that Cu-MTa2O5 coating obviously improves the hydrophobicity, corrosion resistance and antibacterial property of Ti6Al4V alloy. In the coating, both copper and Ta2O5 exhibit an amorphous structure and copper mainly presents as an oxidation state (Cu2O and CuO). With the increase of the doping amount of copper, the grain size, roughness, and hydrophobicity of the modified surface of Ti6Al4V alloy are increased. Electrochemical experiment results demonstrated that the corrosion resistance of Cu-MTa2O5 coated Ti6Al4V alloy slightly decreased with the increase of copper concentration, but this coating still acts strong anticorrosion protection for Ti6Al4V alloy. Moreover, the Cu-MTa2O5 coating can kill more than 97% of Staphylococcus aureus in 24 h, and the antibacterial rate increases with the increase of copper content. Therefore, Cu-MTa2O5 composite coating is a good candidate for improving anticorrosion and antibacterial properties of Ti6Al4V alloy implant medical devices.
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Affiliation(s)
- Zeliang Ding
- School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412007, China; (Y.W.); (Q.Z.); (H.Z.)
| | - Yi Wang
- School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412007, China; (Y.W.); (Q.Z.); (H.Z.)
| | - Quan Zhou
- School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412007, China; (Y.W.); (Q.Z.); (H.Z.)
| | - Ziyu Ding
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China;
| | - Jun Liu
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China;
| | - Quanguo He
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China;
| | - Haibo Zhang
- School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412007, China; (Y.W.); (Q.Z.); (H.Z.)
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9
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Lin YY, Evans RD, Welch E, Hsu BN, Madison AC, Fair RB. Low Voltage Electrowetting-on-Dielectric Platform using Multi-Layer Insulators. Sens Actuators B Chem 2010; 150:465-470. [PMID: 20953362 PMCID: PMC2952892 DOI: 10.1016/j.snb.2010.06.059] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A low voltage, two-level-metal, and multi-layer insulator electrowetting-on-dielectric (EWD) platform is presented. Dispensing 300pl droplets from 140nl closed on-chip reservoirs was accomplished with as little as 11.4V solely through EWD forces, and the actuation threshold voltage was 7.2V with a 1Hz voltage switching rate between electrodes. EWD devices were fabricated with a multilayer insulator consisting of 135nm sputtered tantalum pentoxide (Ta(2)O(5)) and 180nm parylene C coated with 70nm of CYTOP. Furthermore, the minimum actuation threshold voltage followed a previously published scaling model for the threshold voltage, V(T), which is proportional to (t/ε(r))(1/2), where t and ε(r) are the insulator thickness and dielectric constant respectively. Device threshold voltages are compared for several insulator thicknesses (200nm, 500nm, and 1µm), different dielectric materials (parylene C and tantalum pentoxide), and homogeneous versus heterogeneous compositions. Additionally, we used a two-level-metal fabrication process, which enables the fabrication of smaller and denser electrodes with high interconnect routing flexibility. We also have achieved low dispensing and actuation voltages for scaled devices with 30pl droplets.
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Affiliation(s)
- Yan-You Lin
- Dept. of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA
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10
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Waring JL, Roth RS. Effect of Oxide Additions on the Polymorphism of Tantalum Pentoxide (System Ta 2O 5-TiO 2). J Res Natl Bur Stand A Phys Chem 1968; 72A:175-186. [PMID: 31824088 DOI: 10.6028/jres.072a.018] [Citation(s) in RCA: 84] [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] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The phase equilibrium relationships of the TiO2-Ta2O5 system were determined in air. An equimolar compound, TiTa2O7, was found to melt congruently at about 1662 °C and have a monoclinic unit cell a = 20.291 Å, b = 3.804 Å, c = 11.831 Å, β = 120°14', apparently isostructural with TiNb2O7. In addition, two other compounds are postulated to occur at about TiO2:49Ta2O5 and TiO2:7Ta2O5 and to dissociate at about 1230 and 1190 °C, respectively. TiO2 apparently accepts a maximum of 9 mole percent Ta2O5 in solid solution at 1630 °C. Two eutectics occur in the system at 54 mole percent Ta2O5 and 1650 °C and 31 mole percent Ta2O5 and 1630 °C. The high temperature form of Ta2O5 is apparently triclinic at room temperature with a = 3.801 Å, b = 3.785 Å, c = 35.74 Å, α = 90°54.4', β = 90°11.5', and γ = 89°59.9'. A metastable transition occurs at 320 °C to a monoclinic form which inverts to tetragonal at 920 °C with a = 3.81 Å, c = 36.09 Å. Several intermediate morphotropic phases are found with up to 9 mole percent TiO2 in solid solution.
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Affiliation(s)
- J L Waring
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - R S Roth
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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