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Jarosz M, Latosiński J, Gumułka P, Dąbrowska M, Kępczyński M, Sulka GD, Starek M. Controlled Delivery of Celecoxib-β-Cyclodextrin Complexes from the Nanostructured Titanium Dioxide Layers. Pharmaceutics 2023; 15:1861. [PMID: 37514047 PMCID: PMC10383027 DOI: 10.3390/pharmaceutics15071861] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 06/26/2023] [Accepted: 06/29/2023] [Indexed: 07/30/2023] Open
Abstract
Considering the potential of nanostructured titanium dioxide layers as drug delivery systems, it is advisable to indicate the possibility of creating a functional drug delivery system based on anodic TiO2 for celecoxib as an alternative anti-inflammatory drug and its inclusion complex with β-cyclodextrin. First, the optimal composition of celecoxib-β-cyclodextrin complexes was synthesized and determined. The effectiveness of the complexation was quantified using isothermal titration calorimetry (ITC), differential scanning calorimetry (DSC), infrared spectroscopy (FT-IR) nuclear magnetic resonance (1H NMR), and scanning electron microscopy (SEM). Then, nanostructured titanium dioxide layers (TiO2) were synthesized using the electrochemical oxidation technique. The TiO2 layers with pore diameters of 60 nm and layer thickness of 1.60 µm were used as drug delivery systems. The samples were modified with pure celecoxib and the β-cyclodextrin-celecoxib complex. The release profiles shown effective drug release from such layers during 24 h. After the initial burst release, the drug was continuously released from the pores. The presented results confirm that the use of nanostructured TiO2 as a drug delivery system can be effectively used in more complicated systems composed of β-cyclodextrin-celecoxib complexes, making such drugs available for pain treatment, e.g., for orthopedic surgeries.
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Affiliation(s)
- Magdalena Jarosz
- Department of Physical Chemistry & Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Jakub Latosiński
- Department of Physical Chemistry & Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Paweł Gumułka
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, 30-688 Krakow, Poland
- Doctoral School of Medical and Health Sciences, Jagiellonian University Medical College, Łazarza St., 31-530 Krakow, Poland
| | - Monika Dąbrowska
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, 30-688 Krakow, Poland
| | - Mariusz Kępczyński
- Department of Physical Chemistry & Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Grzegorz Dariusz Sulka
- Department of Physical Chemistry & Electrochemistry, Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Małgorzata Starek
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, 30-688 Krakow, Poland
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Michalska-Domańska M, Prabucka K, Czerwiński M. Modification of Anodic Titanium Oxide Bandgap Energy by Incorporation of Tungsten, Molybdenum, and Manganese In Situ during Anodization. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2707. [PMID: 37048998 PMCID: PMC10095768 DOI: 10.3390/ma16072707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 03/20/2023] [Accepted: 03/23/2023] [Indexed: 06/19/2023]
Abstract
In this research, we attempted to modify the bandgap of anodic titanium oxide by in situ incorporation of selected elements into the anodic titanium oxide during the titanium anodization process. The main aim of this research was to obtain photoactivity of anodic titanium oxide over a broader sunlight wavelength. The incorporation of the selected elements into the anodic titanium oxide was proved. It was shown that the bandgap values of anodic titanium oxides made at 60 V are in the visible region of sunlight. The smallest bandgap value was obtained for anodic titanium oxide modified by manganese, at 2.55 eV, which corresponds to a wavelength of 486.89 nm and blue color. Moreover, it was found that the pH of the electrolyte significantly affects the thickness of the anodic titanium oxide layer. The production of barrier oxides during the anodizing process with properties similar to coatings made by nitriding processes is reported for the first time.
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3
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Electrochemistry at Krakowian research institutions. J Solid State Electrochem 2023. [DOI: 10.1007/s10008-023-05391-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
AbstractThe electrochemistry research team activity from Poland is marked by significant increase in the last 20 years. The joining of European Community in 2004 gives an impulse for the development of Polish science. The development of electrochemistry has been stimulated by cooperation with industry and the establishment of technology transfer centers, technology parks, business incubators, etc. and the mostly by simplified international collaborations. Five research institutions from Krakow reports work in the field of electrochemistry. The achievements of all teams are briefly described.
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Gulati K, Martinez RDO, Czerwiński M, Michalska-Domańska M. Understanding the influence of electrolyte aging in electrochemical anodization of titanium. Adv Colloid Interface Sci 2022; 302:102615. [PMID: 35303577 DOI: 10.1016/j.cis.2022.102615] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 02/09/2022] [Accepted: 02/10/2022] [Indexed: 12/19/2022]
Abstract
Titania nanotubes or nanopores self-ordered on electrochemically anodized (EA) titanium have been widely applied towards photocatalysis, solar cells, purification and biomedical implants. As a result, significant research has been focused towards optimizing anodization to fabricate controlled, stable and reproducible nanostructures. Among these, the use of organic-based electrolyte, like ethylene glycol (with NH4F and water), to anodize Ti has been widely applied and researched. Interestingly, among the various influencing EA factors, electrolyte aging (repeated EA using non-target Ti, prior to EA of target Ti substrate) has been underexplored, with only few studies aiming to optimize electrolyte aging and its influence on the nanostructures fabricated. Moreover, many research laboratories utilize electrolyte aging in Ti anodization, but this practice is seldom reported. In this extensive and pioneering review, we discuss and detail electrolyte aging in Ti anodization to fabricate controlled nanostructures, and its influence on nanostructure characteristics including morphology, chemistry, stability and application-specific performance. This review will inform future research aimed at optimizing electrolyte aging and Ti anodization to fabricate controlled nanostructures catering to specific application needs.
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Gulati K, Zhang Y, Di P, Liu Y, Ivanovski S. Research to Clinics: Clinical Translation Considerations for Anodized Nano-Engineered Titanium Implants. ACS Biomater Sci Eng 2021; 8:4077-4091. [PMID: 34313123 DOI: 10.1021/acsbiomaterials.1c00529] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Titania nanotubes (TNTs) fabricated on titanium orthopedic and dental implants have shown significant potential in "proof of concept" in vitro, ex vivo, and short-term in vivo studies. However, most studies do not focus on a clear direction for future research towards clinical translation, and there exists a knowledge gap in identifying key research challenges that must be addressed to progress to the clinical setting. This review focuses on such challenges with respect to anodized titanium implants modified with TNTs, including optimized fabrication on clinically utilized microrough surfaces, clinically relevant bioactivity assessments, and controlled/tailored local release of therapeutics. Further, long-term in vivo investigations in compromised animal models under loading conditions are needed. We also discuss and detail challenges and progress related to the mechanical stability of TNT-based implants, corrosion resistance/electrochemical stability, optimized cleaning/sterilization, packaging/aging, and nanotoxicity concerns. This extensive, clinical translation focused review of TNTs modified Ti implants aims to foster improved understanding of key research gaps and advances, informing future research in this domain.
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Affiliation(s)
- Karan Gulati
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Yifan Zhang
- Department of Oral Implantology, Peking University School and Hospital of Stomatology and National Clinical Research Centre for Oral Diseases and National Engineering Laboratory for Digital and Material Technology of Stomatology and Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Ping Di
- Department of Oral Implantology, Peking University School and Hospital of Stomatology and National Clinical Research Centre for Oral Diseases and National Engineering Laboratory for Digital and Material Technology of Stomatology and Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Yan Liu
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Sašo Ivanovski
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
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Pawlik A, Jarosz M, Socha RP, Sulka GD. The Impacts of Crystalline Structure and Different Surface Functional Groups on Drug Release and the Osseointegration Process of Nanostructured TiO 2. Molecules 2021; 26:1723. [PMID: 33808785 PMCID: PMC8003584 DOI: 10.3390/molecules26061723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 03/10/2021] [Accepted: 03/15/2021] [Indexed: 11/17/2022] Open
Abstract
In implantable materials, surface topography and chemistry are the most important in the effective osseointegration and interaction with drug molecules. Therefore, structural and surface modifications of nanostructured titanium dioxide (TiO2) layers are reported in the present work. In particular, the modification of annealed TiO2 samples with -OH groups and silane derivatives, confirmed by X-ray photoelectron spectroscopy, is shown. Moreover, the ibuprofen release process was studied regarding the desorption-desorption-diffusion (DDD) kinetic model. The results proved that the most significant impact on the release profile is annealing, and further surface modifications did not change its kinetics. Additionally, the cell adhesion and proliferation were examined based on the MTS test and immunofluorescent staining. The obtained data showed that the proposed changes in the surface chemistry enhance the samples' hydrophilicity. Moreover, improvements in the adhesion and proliferation of the MG-63 cells were observed.
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Affiliation(s)
- Anna Pawlik
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30387 Krakow, Poland; (A.P.); (G.D.S.)
| | - Magdalena Jarosz
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30387 Krakow, Poland; (A.P.); (G.D.S.)
| | - Robert P. Socha
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30239 Krakow, Poland;
| | - Grzegorz D. Sulka
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30387 Krakow, Poland; (A.P.); (G.D.S.)
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Guo T, Oztug NAK, Han P, Ivanovski S, Gulati K. Old is Gold: Electrolyte Aging Influences the Topography, Chemistry, and Bioactivity of Anodized TiO 2 Nanopores. ACS APPLIED MATERIALS & INTERFACES 2021; 13:7897-7912. [PMID: 33570904 DOI: 10.1021/acsami.0c19569] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Titanium dioxide (TiO2) nanostructures including nanopores and nanotubes have been fabricated on titanium (Ti)-based orthopedic/dental implants via electrochemical anodization (EA) to enable local drug release and enhanced bioactivity. EA using organic electrolytes such as ethylene glycol often requires aging (repeated anodization of nontarget Ti) to fabricate stable well-ordered nanotopographies. However, limited information is available with respect to its influence on topography, chemistry, mechanical stability, and bioactivity of the fabricated structures. In the current study, titania nanopores (TNPs) using a similar voltage/time were fabricated using different ages of electrolyte (fresh/0 h to 30 h aged). Current density vs time plots of EA, changes in the electrolyte (pH, conductivity, and Ti/F ion concentration), and topographical, chemical, and mechanical characteristics of the fabricated TNPs were compared. EA using 10-20 h electrolytes resulted in stable TNPs with uniform size and improved alignment (parallel to the underlying substrate microroughness). Additionally, to evaluate bioactivity, primary human gingival fibroblasts (hGFs) were cultured onto various TNPs in vitro. The findings confirmed that the proliferation and morphology of hGFs were enhanced on 10-20 h aged electrolyte anodized TNPs. This pioneering study systematically investigates the optimization of anodization electrolyte toward fabricating nanoporous implants with desirable characteristics.
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Affiliation(s)
- Tianqi Guo
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Necla Asli Kocak Oztug
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
- Istanbul University, Faculty of Dentistry, Department of Periodontology, Istanbul 34116, Turkey
| | - Pingping Han
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Sašo Ivanovski
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
| | - Karan Gulati
- The University of Queensland, School of Dentistry, Herston, Queensland 4006, Australia
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8
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Suhadolnik L, Marinko Ž, Ponikvar-Svet M, Tavčar G, Kovač J, Čeh M. Influence of Anodization-Electrolyte Aging on the Photocatalytic Activity of TiO 2 Nanotube Arrays. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:4073-4080. [PMID: 33343787 PMCID: PMC7737329 DOI: 10.1021/acs.jpcc.9b09522] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 01/14/2020] [Indexed: 06/12/2023]
Abstract
TiO2 nanotubular films prepared using the anodic oxidation process applied to various forms of metal titanium are promising materials for photocatalytic applications. However, during successive anodizations in batch-anodization cells, the chemical composition of the NH4F- and water-based ethylene glycol electrolyte changes with each subsequent anodization, which greatly affects the final photocatalytic properties of the annealed TiO2 nanotubular films. In the present study, 20 titanium discs (Φ 90 mm) were sequentially anodized in the same anodization electrolyte. The chemical composition of the electrolyte was measured after each anodization and correlated with the anodization current density, temperature, electrical conductivity, and pH of the electrolyte and with the morphology, structure, composition, and photocatalytic activity of the resulting TiO2 nanotube films. It was found that the length of the TiO2 nanotubes decreased with the age of the electrolyte due to its lower conductivity. The subsurface chemical composition was evaluated by time of flight secondary ion mass spectrometry (ToF SIMS) analyses, and the integrated ToF SIMS signals over a depth of 250 nm for the TiO2 nanotube films showed that the concentration of F- in the annealed TiO2 film increased with each subsequent anodization due to the increased pH value of the electrolyte. As a consequence, the concentration of the OH- and O2 - species decreased, which is a major reason for the reduced photocatalytic activity of the TiO2 films. It is proposed that the length of the TiO2 nanotubes does not play a decisive role in determining the photocatalytic activity of the TiO2 nanotube films. Finally, the best measured degradation results of 60% for caffeine were thus achieved for the first anodized titanium discs. After that the efficiency gradually decreased for each subsequent anodized disc.
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Affiliation(s)
- Luka Suhadolnik
- Department
for Nanostructured Materials, Jožef
Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Živa Marinko
- Department
for Nanostructured Materials, Jožef
Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
- Jožef
Stefan International Postgraduate School, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Maja Ponikvar-Svet
- Department
of Inorganic Chemistry and Technology, Jožef
Stefan Institute, Jamova
39, SI-1000 Ljubljana, Slovenia
| | - Gašper Tavčar
- Department
of Inorganic Chemistry and Technology, Jožef
Stefan Institute, Jamova
39, SI-1000 Ljubljana, Slovenia
| | - Janez Kovač
- Department
of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Miran Čeh
- Department
for Nanostructured Materials, Jožef
Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
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9
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The influence of electrolyte usage on the growth of nanostructured anodic films on copper in sodium carbonate aqueous solution. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2019.113491] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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10
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Fabrication and characterization of electrophoretically deposited chitosan-hydroxyapatite composite coatings on anodic titanium dioxide layers. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.195] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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11
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Gulati K, Li T, Ivanovski S. Consume or Conserve: Microroughness of Titanium Implants toward Fabrication of Dual Micro–Nanotopography. ACS Biomater Sci Eng 2018; 4:3125-3131. [DOI: 10.1021/acsbiomaterials.8b00829] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Karan Gulati
- School of Dentistry, The University of Queensland, 288 Herston Road, Herston, Queensland 4006, Australia
| | - Tao Li
- Department of Prosthodontics, School of Stomatology, Capital Medical University, Beijing 100069, People’s Republic of China
| | - Sašo Ivanovski
- School of Dentistry, The University of Queensland, 288 Herston Road, Herston, Queensland 4006, Australia
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12
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Kapusta-Kołodziej J, Chudecka A, Sulka GD. 3D nanoporous titania formed by anodization as a promising photoelectrode material. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.06.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Li T, Gulati K, Wang N, Zhang Z, Ivanovski S. Understanding and augmenting the stability of therapeutic nanotubes on anodized titanium implants. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 88:182-195. [PMID: 29636134 DOI: 10.1016/j.msec.2018.03.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 03/13/2018] [Indexed: 01/08/2023]
Abstract
Titanium is an ideal material choice for orthopaedic and dental implants, and hence a significant amount of research has been focused towards augmenting the therapeutic efficacy of titanium surfaces. More recently the focus has shifted to nano-engineered implants fabricated via anodization to generate self-ordered nanotubular structures composed of titania (TiO2). These structures (titania nanotubes/TNTs) enable local drug delivery and tailorable cellular modulation towards achieving desirable effects like enhanced osseointegration and antibacterial action. However, the mechanical stability of such modifications is often ignored and remains underexplored, and any delamination or breakage in the TNTs modification can initiate toxicity and lead to severe immuno-inflammatory reactions. This review details and critically evaluates the progress made in relation to this aspect of TNT based implants, with a focus on understanding the interface between TNTs and the implant surface, treatments aimed at augmenting mechanical stability and strategies for advanced mechanical testing within the bone micro-environment ex vivo and in vivo. This review article extends the existing knowledge in this domain of TNTs implant technology and will enable improved understanding of the underlying parameters that contribute towards mechanically robust nano-engineered implants that can withstand the forces associated with implant surgical placement and the load bearing experienced at the bone/implant interface.
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Affiliation(s)
- Tao Li
- School of Dentistry and Oral Health, Griffith University, Gold Coast, QLD, Australia; Menzies Health Institute Queensland (MHIQ), Griffith University, Gold Coast, QLD, Australia; Department of Prosthodontics, School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Karan Gulati
- School of Dentistry and Oral Health, Griffith University, Gold Coast, QLD, Australia; Menzies Health Institute Queensland (MHIQ), Griffith University, Gold Coast, QLD, Australia; The University of Queensland, School of Dentistry, Herston Qld 4006, Australia.
| | - Na Wang
- Department of Prosthodontics, School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Zhenting Zhang
- Department of Prosthodontics, School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Sašo Ivanovski
- School of Dentistry and Oral Health, Griffith University, Gold Coast, QLD, Australia; Menzies Health Institute Queensland (MHIQ), Griffith University, Gold Coast, QLD, Australia; The University of Queensland, School of Dentistry, Herston Qld 4006, Australia.
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14
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Co-delivery of ibuprofen and gentamicin from nanoporous anodic titanium dioxide layers. Colloids Surf B Biointerfaces 2017; 152:95-102. [DOI: 10.1016/j.colsurfb.2017.01.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 12/11/2016] [Accepted: 01/06/2017] [Indexed: 01/26/2023]
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15
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Jin R, Fan H, Yin X, Chen Q, Ma J, Ma W. A capacitor circuit model for theoretical derivation of anodizing current. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.066] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Golda-Cepa M, Syrek K, Brzychczy-Wloch M, Sulka G, Kotarba A. Primary role of electron work function for evaluation of nanostructured titania implant surface against bacterial infection. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 66:100-105. [DOI: 10.1016/j.msec.2016.04.079] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/29/2016] [Accepted: 04/21/2016] [Indexed: 01/16/2023]
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17
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Nanoporous anodic titanium dioxide layers as potential drug delivery systems: Drug release kinetics and mechanism. Colloids Surf B Biointerfaces 2016; 143:447-454. [DOI: 10.1016/j.colsurfb.2016.03.073] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 03/22/2016] [Accepted: 03/24/2016] [Indexed: 12/11/2022]
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18
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Huang X, Liu Y, Yu H, Yang X, Wang Y, Hang R, Tang B. One-step fabrication of cytocompatible micro/nano-textured surface with TiO2 mesoporous arrays on titanium by high current anodization. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.03.119] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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19
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Zhang Y, Cheng W, Du F, Zhang S, Ma W, Li D, Song Y, Zhu X. Quantitative relationship between nanotube length and anodizing current during constant current anodization. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.08.098] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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20
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Syrek K, Kapusta-Kołodziej J, Jarosz M, Sulka GD. Effect of electrolyte agitation on anodic titanium dioxide (ATO) growth and its photoelectrochemical properties. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.09.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Simulation of anodizing current-time curves and morphology evolution of TiO2 nanotubes anodized in electrolytes with different NH4F concentrations. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.07.110] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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22
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Chong B, Yu D, Jin R, Wang Y, Li D, Song Y, Gao M, Zhu X. Theoretical derivation of anodizing current and comparison between fitted curves and measured curves under different conditions. NANOTECHNOLOGY 2015; 26:145603. [PMID: 25785353 DOI: 10.1088/0957-4484/26/14/145603] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Anodic TiO2 nanotubes have been studied extensively for many years. However, the growth kinetics still remains unclear. The systematic study of the current transient under constant anodizing voltage has not been mentioned in the original literature. Here, a derivation and its corresponding theoretical formula are proposed to overcome this challenge. In this paper, the theoretical expressions for the time dependent ionic current and electronic current are derived to explore the anodizing process of Ti. The anodizing current-time curves under different anodizing voltages and different temperatures are experimentally investigated in the anodization of Ti. Furthermore, the quantitative relationship between the thickness of the barrier layer and anodizing time, and the relationships between the ionic/electronic current and temperatures are proposed in this paper. All of the current-transient plots can be fitted consistently by the proposed theoretical expressions. Additionally, it is the first time that the coefficient A of the exponential relationship (ionic current j(ion) = A exp(BE)) has been determined under various temperatures and voltages. And the results indicate that as temperature and voltage increase, ionic current and electronic current both increase. The temperature has a larger effect on electronic current than ionic current. These results can promote the research of kinetics from a qualitative to quantitative level.
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Affiliation(s)
- Bin Chong
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, People's Repubilc of China
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23
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Zhang Y, Yu D, Gao M, Li D, Song Y, Jin R, Ma W, Zhu X. Growth of anodic TiO2 nanotubes in mixed electrolytes and novel method to extend nanotube diameter. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.02.058] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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