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Gkomoza P, Kitsou I, Koltsakidis S, Tzetzis D, Karydis-Messinis A, Zafeiropoulos NE, Gerodimou F, Kollia E, Valdramidis V, Tsetsekou A. Effect of Nanoceria Suspension Addition on the Physicochemical and Mechanical Properties of Hybrid Organic-Inorganic Hydroxyapatite Composite Scaffolds. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1102. [PMID: 38998708 PMCID: PMC11242940 DOI: 10.3390/nano14131102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2024] [Revised: 06/24/2024] [Accepted: 06/25/2024] [Indexed: 07/14/2024]
Abstract
In the current study, the synthesis of hydroxyapatite-ceria (HAP-CeO2) scaffolds is attempted through a bioinspired chemical approach. The utilized colloidal CeO2 suspension presents antifungal activity against the Aspergillus flavus and Aspergillus fumigatus species at concentrations higher than 86.1 ppm. Three different series of the composite HAP-CeO2 suspensions are produced, which are differentiated based on the precursor suspension to which the CeO2 suspension is added and by whether this addition takes place before or after the formation of the hydroxyapatite phase. Each of the series consists of three suspensions, in which the pure ceria weight reaches 4, 5, and 10% (by mass) of the produced hydroxyapatite, respectively. The characterization showed that the 2S series's specimens present the greater alteration towards their viscoelastic properties. Furthermore, the 2S series's sample with 4% CeO2 presents the best mechanical response. This is due to the growth of needle-like HAP crystals during lyophilization, which-when oriented perpendicular to the direction of stress application-enhance the resistance of the sample to deformation. The 2S series's scaffolds had an average pore size equal to 100 μm and minimum open porosity 89.5% while simultaneously presented the lowest dissolution rate in phosphate buffered saline.
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Affiliation(s)
- Paraskevi Gkomoza
- Laboratory of Metallurgy, School of Mining & Metallurgical Engineering, National Technical University of Athens, 9 Heroon, Polytechniou Ave., 15772 Zografos, Athens, Greece
| | - Ioanna Kitsou
- Laboratory of Metallurgy, School of Mining & Metallurgical Engineering, National Technical University of Athens, 9 Heroon, Polytechniou Ave., 15772 Zografos, Athens, Greece
| | - Savvas Koltsakidis
- Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, 14th km Thessaloniki-N. Moudania, 57001 Thermi, Thessaloniki, Greece
| | - Dimitrios Tzetzis
- Digital Manufacturing and Materials Characterization Laboratory, School of Science and Technology, International Hellenic University, 14th km Thessaloniki-N. Moudania, 57001 Thermi, Thessaloniki, Greece
| | | | | | - Foteini Gerodimou
- Laboratory of Food Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Zografos, Athens, Greece
| | - Eleni Kollia
- Laboratory of Food Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Zografos, Athens, Greece
| | - Vasilis Valdramidis
- Laboratory of Food Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Zografos, Athens, Greece
| | - Athena Tsetsekou
- Laboratory of Metallurgy, School of Mining & Metallurgical Engineering, National Technical University of Athens, 9 Heroon, Polytechniou Ave., 15772 Zografos, Athens, Greece
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Husain A, Al-Zahrani SA, Al Otaibi A, Khan I, Mujahid Ali Khan M, Alosaimi AM, Khan A, Hussein MA, Asiri AM, Jawaid M. Fabrication of Reproducible and Selective Ammonia Vapor Sensor-Pellet of Polypyrrole/Cerium Oxide Nanocomposite for Prompt Detection at Room Temperature. Polymers (Basel) 2021; 13:polym13111829. [PMID: 34073027 PMCID: PMC8198213 DOI: 10.3390/polym13111829] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 05/22/2021] [Indexed: 11/16/2022] Open
Abstract
Polypyrrole (PPy) and polypyrrole/cerium oxide nanocomposite (PPy/CeO2) were prepared by the chemical oxidative method in an aqueous medium using anhydrous ferric chloride (FeCl3) as an oxidant. The successful formulation of materials was confirmed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmittance electron microscopy (TEM). A four-in-line probe device was used for studying DC electrical conductivity and ammonia vapor sensing properties of PPy and PPy/CeO2. The significant improvement in both the conductivity and sensing parameters of PPy/CeO2 compared to pristine PPy reveals some synergistic/electronic interaction between PPy and cerium oxide nanoparticles (CeO2 NPs) working at molecular levels. The initial conductivity (i.e., conductivity at room temperature) was found to be 0.152 Scm-1 and 1.295 Scm-1 for PPy and PPy/CeO2, respectively. Also, PPy/CeO2 showed much better conductivity retention than pristine PPy under both the isothermal and cyclic ageing conditions. Ammonia vapor sensing was carried out at different concentration (0.01, 0.03, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 vol %). The sensing response of PPy/CeO2 varied with varying concentrations. At 0.5 vol % ammonia concentration, the % sensing response of PPy and PPy/CeO2 sensor was found to be 39.1% and 93.4%, respectively. The sensing efficiency of the PPy/CeO2 sensor was also evaluated at 0.4. 0.3, 0.2, 0.1, 0.05, 0.03, and 0.01 vol % ammonia concentration in terms of % sensing response, response/recovery time, reversibility, selectivity as well as stability at room temperature.
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Affiliation(s)
- Ahmad Husain
- Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India
- Correspondence: (A.H.); (A.K.)
| | - Salma Ahmed Al-Zahrani
- Chemistry Department, Faculty of Science, University of Ha’il, P.O. Box 2440, Ha’il 81451, Saudi Arabia; (S.A.A.-Z.); (A.A.O.)
| | - Ahmed Al Otaibi
- Chemistry Department, Faculty of Science, University of Ha’il, P.O. Box 2440, Ha’il 81451, Saudi Arabia; (S.A.A.-Z.); (A.A.O.)
| | - Imran Khan
- Applied Science and Humanities Section, Faculty of Engineering and Technology, University Polytechnic, Aligarh Muslim University, Aligarh 202002, India; (I.K.); (M.M.A.K.)
| | - Mohammad Mujahid Ali Khan
- Applied Science and Humanities Section, Faculty of Engineering and Technology, University Polytechnic, Aligarh Muslim University, Aligarh 202002, India; (I.K.); (M.M.A.K.)
| | - Abeer Mohamed Alosaimi
- Department of Chemistry, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia;
| | - Anish Khan
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (M.A.H.); (A.M.A.)
- Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
- Correspondence: (A.H.); (A.K.)
| | - Mahmoud Ali Hussein
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (M.A.H.); (A.M.A.)
- Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt
| | - Abdullah M. Asiri
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (M.A.H.); (A.M.A.)
- Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Mohammad Jawaid
- Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products (INTROP), University Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia;
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Ponnaiah SK, Prakash P, Balasubramanian J. Effective and reliable platform for nonenzymatic nanomolar-range quinol detection in water samples using ceria doped polypyrrole nanocomposite embedded on graphitic carbon nitride nanosheets. CHEMOSPHERE 2021; 271:129533. [PMID: 33421911 DOI: 10.1016/j.chemosphere.2021.129533] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 12/18/2020] [Accepted: 12/29/2020] [Indexed: 06/12/2023]
Abstract
A glassy carbon electrode modification by a novel ternary nanocomposite of advantageously united ceria, polypyrrole, and graphitic carbon nitride (CeO2/Ppy@g-C3N4) is reported here. It can be used to tailor the sensor surface for the electrochemical detection of nanomolar-level quinol (Qnl), a chemical widely used as a developing agent in photography and lithography, as a cosmetic, and as an antioxidant in rubber and food industries. The occupational exposure of Qnl may occur by inhalation or dermal contact, leading to lot of health hazards. The synthesized nanocomposite was characterized by various analytical techniques such as UV-Vis, Fourier transformed infrared (FTIR), X-ray powder diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, Raman, thermogravimetric analysis, energy-dispersive X-ray spectroscopy, selected area electron diffraction, and elemental mapping analyses. The oxidation current of Qnl is linear to its concentration in the range of 0.01-260 μM and the lowest detection and quantification limit are found to be 1.5 nM and 0.004 μM, respectively, with a sensitivity of 283.33 μA mM-1 cm-2. The performance of the modified electrode was compared with those of high-performance liquid chromatography, which indicates that the proposed sensor can be used as an effective and reliable platform for nano-molar detection of Qnl in various environmental and biological fluids.
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Affiliation(s)
- Sathish Kumar Ponnaiah
- Department of Chemistry, Thiagarajar College, Madurai, 625 009, Tamil Nadu, India; National Centre of Excellence, MHRD, Thiagarajar College, Madurai, 625 009, Tamil Nadu, India
| | - P Prakash
- Department of Chemistry, Thiagarajar College, Madurai, 625 009, Tamil Nadu, India.
| | - Jeyaprabha Balasubramanian
- Department of Civil Engineering, Sethu Institute of Technology, Virudhunagar, 626 115, Tamil Nadu, India
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