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Javidi H, Ramazani Saadatabadi A, Sadrnezhaad SK, Najmoddin N. Conductive nerve conduit with piezoelectric properties for enhanced PC12 differentiation. Sci Rep 2023; 13:12004. [PMID: 37491480 PMCID: PMC10368663 DOI: 10.1038/s41598-023-38456-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 07/08/2023] [Indexed: 07/27/2023] Open
Abstract
Restoration of nerve tissue remains highly challenging, mainly due to the limited regeneration capacity of the nervous system and the development of fibrosis. This limitation necessitates designing new nerve guidance channel to promote nerve repairing. In this study, we developed a novel core/shell conduit to induce PC12 differentiation. Co-electrospinning method was utilized to produce a fibrous shell containing polycaprolactone/polyvinylidene fluoride PCL/PVDF, gelatin and polyaniline/graphene (PAG) nanocomposite. The core section of the conduit was filled with chitosan-gelatin hydrogel containing PAG and ZnO nanoparticles. Such conduit shows antibacterial activity, electrical conductivity and piezoelectric property. The effect of such engineered conduit on PC12 differentiation was investigated by analyzing differentiation markers Nestin and microtubule-associated protein 2 (MAP2) through immunocytochemistry and PCR-RT techniques. The result revealed that such conduit could significantly induce Nestin and MAP2 gene expression in the PC12 cells and, thus, it is a viable option for effective cell differentiation and nerve regeneration.
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Affiliation(s)
- Hamideh Javidi
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | - S K Sadrnezhaad
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
| | - Najmeh Najmoddin
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
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Rahnamaee SY, Ahmadi Seyedkhani S, Eslami Saed A, Sadrnezhaad SK, Seza A. Bioinspired TiO2/Chitosan/HA Coatings on Ti Surfaces: Biomedical Improvement by Intermediate Hierarchical Films. Biomed Mater 2022; 17. [PMID: 35349998 DOI: 10.1088/1748-605x/ac61fc] [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: 12/17/2021] [Accepted: 03/29/2022] [Indexed: 11/11/2022]
Abstract
The most common reasons for hard-tissue implant failure are structural loosening and prosthetic infections. Hence, to fix the first problem, different bioinspired coatings were applied to the titanium alloy surfaces in this study, including dual acid-etched, anodic TiO2 nanotubes array (TNTs), anodic hierarchical titanium oxide, micro- and nanostructured hydroxyapatite (HA) layers, and HA/chitosan (HA/CS) nanocomposite coating. XRD and FTIR analysis demonstrated that the in situ HA/chitosan nanocomposite formed successfully. The MTT assay showed that all samples had excellent cell viability, with cell proliferation rates ranging from 120-150% after 10 days. The hierarchical coating demonstrated superhydrophilicity (θ ≈ 0°) and increased the wettability of the metallic Ti surface by more than 120%. The friction coefficient of all fabricated surfaces was within the range of natural bone's mechanical behavior. The intermediate hierarchical oxide layer increased the adhesion strength of the HA/chitosan coating by more than 60%. The Hierarchical middle oxide layer caused the mechanical stability of HA/CS during the 1000 m of friction test. The microhardness of HA/CS (22.5 HV) and micro-HA (25.5 HV) coatings was comparable to that of human bone. An intermediate hierarchical oxide-based mechanism for improving adhesion strength in HA/CS coatings was presented.
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Affiliation(s)
- Seyed Yahya Rahnamaee
- Sharif University of Technology, Department of Materials Science and Engineering , Sharif University of Technology , Azadi Ave , Tehran , Iran, Tehran, Tehran, 1458889694, Iran (the Islamic Republic of)
| | - Shahab Ahmadi Seyedkhani
- Materials Science and Engineering, Sharif University of Technology, Department of Materials Science and Engineering , Sharif University of Technology , Azadi Ave , Tehran , Iran, Institute for Nanoscience and Nanotechnology (INST), Sharif University of Technology , Azadi Ave , Tehran , Iran, Tehran, Tehran, 1458889694, Iran (the Islamic Republic of)
| | - Aylar Eslami Saed
- Sharif University of Technology, Azadi Ave., Sharif University of Technology, Tehran, Tehran, 11365-9466, Iran (the Islamic Republic of)
| | - S K Sadrnezhaad
- Materials Science and Engineering, Sharif University of Technology, PO Box 11365-9466, Tehran, Tehran, 1458889694, Iran (the Islamic Republic of)
| | - Ashkan Seza
- Sharif University of Technology, Azadi Ave., Sharif University of Technology, Tehran, Tehran, 11365-9466, Iran (the Islamic Republic of)
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Amirjani A, Salehi K, Sadrnezhaad SK. Simple SPR-based colorimetric sensor to differentiate Mg 2+ and Ca 2+ in aqueous solutions. Spectrochim Acta A Mol Biomol Spectrosc 2022; 268:120692. [PMID: 34894568 DOI: 10.1016/j.saa.2021.120692] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 11/25/2021] [Accepted: 11/29/2021] [Indexed: 06/14/2023]
Abstract
L-tryptophan functionalized AgNPs were successfully fabricated using a one-pot synthesis method and assessed as a colorimetric probe for rapid and accurate determination of Mg2+ ions. The developed sensor showed a selective response towards Mg2+ with no interference from Ca2+ in the wide concentration range of 1-200 µM. The sensor's response was optimized in the pH range of 9-10, which can be attributed to the protonation of amine groups and their interaction with Mg2+ ions. The stability and selectivity of the sensor were examined in different salt (NaCl) and other metal ions, respectively. The L-tryptophan-AgNPs sensor detected Mg2+ with the limit of detection of 3 µM, which is way lower than the concentration range of magnesium in human serum (0.75-1.05 mM). The recovery values of the developed sensor were in the range of 96-102% for the determination of Mg2+ in urine samples. The obtained performances proved the potential application of the developed sensor for clinical diagnostic of Mg2+ ions where an accurate and rapid response is needed.
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Affiliation(s)
- Amirmostafa Amirjani
- Department of Materials Science and Engineering, Sharif University of Technology, P.O.Box: 11155-9466, Tehran, Iran.
| | - Kimia Salehi
- Department of Materials Science and Engineering, Sharif University of Technology, P.O.Box: 11155-9466, Tehran, Iran
| | - S K Sadrnezhaad
- Department of Materials Science and Engineering, Sharif University of Technology, P.O.Box: 11155-9466, Tehran, Iran.
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Daneshvar e Asl S, Zarenezhad H, Askari M, Halali M, Sadrnezhaad SK. Efficient light harvesting in perovskite layer via three-dimensional TiO2 nanobranched nanorod scaffold. Nano Ex 2020. [DOI: 10.1088/2632-959x/abc599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
A comparative study was done on three types of TiO2 thin film morphology, i.e., mesoporous nanoparticles, nanorods, and nanobranched nanorods thin films, as the scaffold for the perovskite solar cell. The performances of the perovskite-coated thin films were compared in terms of charge carrier extraction, charge transport, and solar energy harvesting via photoluminescence and UV–vis spectroscopies. TiO2 nanobranched nanorods thin film showed better photovoltaic performance than those of mesoporous nanoparticles and nanorods thin films. The better optical properties of nanobranched nanorods thin film as the scaffold is ascribed to its unique morphological advantages, i.e., remarkable specific surface area along with high-speed pathways for charge carriers. These characteristics lead to great, compact, and uniform perovskite loading, excellent electron transport property, and desired light harvesting performance, which are preferable features for promoting the efficiency of the perovskite solar cells. This paper introduces an outstanding scaffold for fabrication of high-performance perovskite solar cells.
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Akbarinia S, Sadrnezhaad SK, Hosseini SA. Porous shape memory dental implant by reactive sintering of TiH 2-Ni-Urea mixture. Mater Sci Eng C Mater Biol Appl 2019; 107:110213. [PMID: 31761172 DOI: 10.1016/j.msec.2019.110213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 08/23/2019] [Accepted: 09/16/2019] [Indexed: 10/25/2022]
Abstract
We produced bifurcated bone-like shape memory implant (BL-SMI) with desirable tooth-root fixation capability by compact-sintering of TiH2-Ni-urea mixture. The primary constituents of the porous product were Ni and Ti. We could adjust the pores' shape, size, and interconnectivity for favorite bone ingrowth by using urea as a space holder. Without urea, we obtained an average porosity of 0.30, and a mean void size of 100 μm. With 70 vol % urea, we got 62% interconnected pores of 400 μm average size. Aging allowed us to tune the austenite-martensite transformation temperatures towards the needed body tissue arouse. Differential scanning calorimetry measured the transformation temperatures. Their austenite start, austenite peak, and austenite finish values were As = 4, Ap = 22, and Af = 34 °C, respectively. They retained functional shape recovery and superelastic effect at the body temperature. Mechanical properties, including Young's modulus of the specimens, matched well to maxilla and mandible bone tissue. The measured Young's modulus of the NiTi specimens was as low as 3.5 GPa, which decreased to ∼2.1 GPa with further porosity increase at higher space holder percentages. Superelasticity regime and low Young's modulus of the implant could potentially prevent stress-shielding from the surrounding bone tissues and give rise to secure fixation of the implant into the bone socket. Bending tests showed 0.9 mm recoverable deflection for specimens which assisted immediate self-fixation of the implant into the jaw bone cavity.
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Affiliation(s)
- Shahriar Akbarinia
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Zanjan University of Medical Science, Zanjan, Iran
| | - S K Sadrnezhaad
- Department of Materials Science and Engineering, Sharif University of Technology, PO Box 11365-9466, Tehran, Iran.
| | - S A Hosseini
- Department of Materials Engineering, Faculty of Engineering, Hakim Sabzevari University, P.O. Box 397, Sabzevar, Iran
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Daneshvar e Asl S, Sadrnezhaad SK. Photocatalytic activity of rutile/anatase TiO2 nanorod/nanobranch thin film loaded with Au@Ag@Au core double shell nanoparticles. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.05.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mofrad RN, Sadrnezhaad SK, Khaki JV. Mechanism of Nanostructured Fluorapatite Formation from CaO, CaF2 and P2O5 Precursors by Mechanochemical Synthesis. Progress in Reaction Kinetics and Mechanism 2018. [DOI: 10.3184/146867818x15233705894419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We determined the mechanism of mechanochemical synthesis of fluorapatite from CaO, CaF2 and P2O5 by characterisation of the intermediate compounds. We used atomic absorption spectroscopy, X-ray diffraction, field emission scanning electron microscopy, FTIR spectroscopy and transmission electron microscopy to find the transitional compounds. Investigation of the binary and ternary powder mixtures revealed the appearance of H3PO4, Ca(OH)2, Ca2P2O7 and CaCO3 as the intermediate compounds. At early stages of the milling, conversions of P2O5 to H3PO4 and CaO to Ca(OH)2 occurred in the wet atmosphere. Later, a combination of Ca(OH)2 and H3PO4 formed C a2P2O7 while the unreacted CaO was converted to CaCO3 by CO2 of the ambient atmosphere. Spherical crystalline Ca10 (PO4)6F2 particles formed after 48 hours of milling due to the reaction between Ca2P2O7, CaCO3 and CaF2.
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Affiliation(s)
- Raheleh Nikonam Mofrad
- Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, 1455 De Maisonneuve Blvd. W., Montreal, Quebec, Canada H3G 1M8
| | | | - Jalil Vahdati Khaki
- Department of Material Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, PO Box 91775-1111, Mashhad, Iran
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Ahmadi S, Riahi Z, Eslami A, Sadrnezhaad SK. Fabrication mechanism of nanostructured HA/TNTs biomedical coatings: an improvement in nanomechanical and in vitro biological responses. J Mater Sci Mater Med 2016; 27:150. [PMID: 27582070 DOI: 10.1007/s10856-016-5758-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 07/20/2016] [Indexed: 06/06/2023]
Abstract
In this paper, a mechanism for fabrication of nanostructured hydroxyapatite coating on TiO2 nanotubes is presented. Also, the physical, biological, and nanomechanical properties of the anodized Ti6Al4V alloy consisting TiO2 nanotubes, electrodeposited hydroxyapatite, and the hydroxyapatite/TiO2 nanotubes double layer coating on Ti6Al4V alloy implants are compared. Mean cell viability of the samples being 84.63 % for uncoated plate, 91.53 % for electrodeposited hydroxyapatite, and 94.98 % for hydroxyapatite/TiO2 nanotubes coated sample were in the acceptable range. Merely anodized prototype had the highest biocompatibility of 110 % with respect to the control sample. Bonding strength of hydroxyapatite deposit to the substrate increased from 12 ± 2 MPa to 25.4 ± 2 MPa using intermediate TiO2 nanotubes layer. Hardness and elastic modulus of the anodized surface were 956 MPa and 64.7 GPa, respectively. The corresponding values for hydroxyapatite deposit were approximately measured 44.3 MPa and 0.66 GPa, respectively, while the average obtained values for hardness (159.3 MPa) and elastic modulus (2.25 GPa) of the hydroxyapatite/TiO2 nanotubes double coating improved more than 30 % of the pure hydroxyapatite deposit. Friction coefficient (ξ) of the anodized surface was 0.32 ± 0.02. The calculated friction coefficient enhanced from 0.65 ± 0.04 for sole hydroxyapatite layer to the 0.46 ± 0.02 for hydroxyapatite/TiO2 nanotubes due to presence of nanotubular TiO2 intermediate layer.
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Affiliation(s)
- Shahab Ahmadi
- Advanced Bionanomaterials Laboratory, Department of Materials science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran.
| | - Zohreh Riahi
- Advanced Bionanomaterials Laboratory, Department of Materials science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran
| | - Aylar Eslami
- Advanced Bionanomaterials Laboratory, Department of Materials science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran
| | - S K Sadrnezhaad
- Advanced Bionanomaterials Laboratory, Department of Materials science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran
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Hassanzadeh N, Sadrnezhaad SK, Chen G. In-situ hydrothermal synthesis of Na 3 MnCO 3 PO 4 /rGO hybrid as a cathode for Na-ion battery. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.05.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Jalali M, Siavash Moakhar R, Kushwaha A, Goh GKL, Riahi-Noori N, Sadrnezhaad SK. Enhanced dye loading-light harvesting TiO2 photoanode with screen printed nanorod-nanoparticles assembly for highly efficient solar cell. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.04.077] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hatamie S, Akhavan O, Sadrnezhaad SK, Ahadian MM, Shirolkar MM, Wang HQ. Curcumin-reduced graphene oxide sheets and their effects on human breast cancer cells. Mater Sci Eng C Mater Biol Appl 2015; 55:482-9. [PMID: 26117780 DOI: 10.1016/j.msec.2015.05.077] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 05/11/2015] [Accepted: 05/28/2015] [Indexed: 01/12/2023]
Abstract
Curcumin (as a natural reductant material) was utilized for green reduction and functionalization of chemically exfoliated graphene oxide (GO) sheets. The π-π attachment of the curcumin molecules onto the curcumin-reduced graphene oxide (rGO) sheets was confirmed by Raman and Fourier transform infrared spectroscopies. Zeta potential of the GO sheets decreased from about -40 mV to -20 mV, after the green reduction and functionalization. The probable cytotoxicity of the curcumin-rGO sheets was studied through their interactions with two human breast cancer cell lines (MDA-MB-231 and SKBR3 cell lines) and a normal cell line (mouse fibroblast L929 cell line). The curcumin-rGO sheet with concentrations <70 μg/mL in the cell culture medium, not only exhibited no significant toxicity and/or cell morphological changes, but also caused some cell growths (~25% after 48 h incubation time). Nevertheless, at 70 μg/mL, initiation of some cell morphological changes was observed. At higher concentrations (e.g., 100 μg/mL), some slight cytotoxic effects (resulting in ~15-25% cell destruction) were detected by MTT assay. In addition, the interaction of the rGO sheets and cells resulted in apoptosis as well as morphological transformation of the cells (from elongated to roundup morphology). These results indicated the concentration-dependent toxicity of functionalized-rGO nanomaterials (here, curcumin-rGO) at the threshold concentration of ~100 μg/mL.
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Affiliation(s)
- Shadie Hatamie
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
| | - Omid Akhavan
- Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran; Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box 14588-89694, Tehran, Iran.
| | - Sayed Khatiboleslam Sadrnezhaad
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran; Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box 14588-89694, Tehran, Iran
| | - Mohammad Mahdi Ahadian
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, P.O. Box 14588-89694, Tehran, Iran
| | - Mandar M Shirolkar
- USTC-SHINCRON Joint Laboratory, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Haiqian Q Wang
- USTC-SHINCRON Joint Laboratory, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
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Cheraghi A, Ardakani MS, Keshavarz Alamdari E, Haghshenas Fatmesari D, Darvishi D, Sadrnezhaad SK. Thermodynamics of vanadium (V) solvent extraction by mixture of D2EHPA and TBP. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.minpro.2015.03.011] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sadrnezhaad SK, Aryana M, Hassanzadeh Nemati N, Alizadeh M, Ebadifar A. Single and double stage sintering of mechanically alloyed powder for nanostructured Ti6Al4V foams usable in cancellous scaffolds. ACTA ACUST UNITED AC 2013. [DOI: 10.1179/1749514813z.00000000052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Dezfuli SN, Sadrnezhaad SK, Shokrgozar MA, Bonakdar S. Fabrication of biocompatible titanium scaffolds using space holder technique. J Mater Sci Mater Med 2012; 23:2483-2488. [PMID: 22736051 DOI: 10.1007/s10856-012-4706-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2012] [Accepted: 06/13/2012] [Indexed: 06/01/2023]
Abstract
Open-pore titanium scaffolds were fabricated by sintering of compressed mixtures of TiH(1.924) and urea. Spherical and irregular shaped space holders were used to investigate the effect of pore shape on cellular behavior. After removal of the space holder, the shape of the spacers was replicated to the pores. Average diameter of the pores was in the range of 300-600 μm. SEM images showed that titanium hydride resulted in higher surface roughness and larger micro porosities than pure titanium. In vitro evaluations were carried out by using MTT assay, measuring alkaline phosphatase activity and alizarin red staining in flow perfusion bioreactor for cell culture. Observations revealed excellent attachment and proliferation of G-292 cells to the highly porous scaffolds fabricated with titanium hydride and urea of this research.
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Affiliation(s)
- S Naddaf Dezfuli
- Department of Materials Science and Engineering, Sharif University of Technology, PO Box 11365-9466, Tehran, Iran
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Mohseni Meybodi S, Hosseini SA, Rezaee M, Sadrnezhaad SK, Mohammadyani D. Synthesis of wide band gap nanocrystalline NiO powder via a sonochemical method. Ultrason Sonochem 2012; 19:841-845. [PMID: 22217498 DOI: 10.1016/j.ultsonch.2011.11.017] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 11/01/2011] [Accepted: 11/28/2011] [Indexed: 05/31/2023]
Abstract
A sonochemistry-based synthesis method was used to produce nanocrystalline nickel oxide powder with ≈ 20 nm average crystallite diameter from Ni(OH)(2) precursor. Ultrasound waves were applied to the primary solution to intensify the Ni(OH)(2) precipitation. Dried precipitates were calcined at 320°C to form nanocrystalline NiO particles. The morphology of the produced powder was characterized by transmission electron microscopy. Using sonochemical waves resulted in lowering of the size of the nickel oxide crystallites. FT-IR spectroscopy and X-ray diffraction revealed high purity well-crystallized structure of the synthesized powder. Photoluminescence spectroscopy confirmed production of a wide band-gap structure.
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Esmaielzadeh Kandjani A, Farzalipour Tabriz M, Arefian NA, Vaezi MR, Halek F, Sadrnezhaad SK. Photocatalytic decoloration of Acid Red 27 in presence of SnO2 nanoparticles. Water Sci Technol 2010; 62:1256-1264. [PMID: 20861538 DOI: 10.2166/wst.2010.156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this paper, the photocatalytic decoloration of Acid Red 27 (AR27) has been investigated using ultraviolet (UV) irradiation in presence of SnO2 nanoparticles. SnO2 nanoparticles were synthesized via hydrothermal process. The SnO2 nanoparticles' average crystallite sizes derived from X-ray analyses which were synthesized for 2, 12 and 24 hrs were about 3.73, 5.31 and 7.6 nm, respectively. Brunauer-Emmett-Teller (BET) analyses showed high surface area of about 183, 120 and 90(m2/g), respectively for aforementioned synthesized samples. Our investigations indicated that reaction rate constant and photocatalytic efficiency of AR27 decoloration have a direct relation with SnO2 nanoparticles' specific surface areas and band gap energies. Decoloration kinetics was investigated by using Langmuir-Hinshelwood model. The values of the adsorption equilibrium constant, K[AR27], and the kinetic rate constant of surface reaction, kc, were found to be 0.0924 (l/mg) and 0.2535 (mg/l min), respectively.
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Mazloumi M, Zanganeh S, Kajbafvala A, Ghariniyat P, Taghavi S, Lak A, Mohajerani M, Sadrnezhaad SK. Ultrasonic induced photoluminescence decay in sonochemically obtained cauliflower-like ZnO nanostructures with surface 1D nanoarrays. Ultrason Sonochem 2009; 16:11-14. [PMID: 18603463 DOI: 10.1016/j.ultsonch.2008.05.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Revised: 04/26/2008] [Accepted: 05/22/2008] [Indexed: 05/26/2023]
Abstract
Cauliflower-like ZnO nanostructures with average crystallite size of about 55 nm which have surface one dimensional (1D) nanoarrays with 10 nm diameter were successfully fabricated through a simple sonochemical route. X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and room temperature photoluminescence (PL) characterizations were performed to investigate the morphological and structural properties of the obtained nanostructures. It has been shown that the synthesized cauliflower-like ZnO nanostructures irradiated UV luminescence and a green peak in visible band. Ultrasonic post-treatment of the particles for about 2 h increased the density of surface defects resulted in an increase in the green emission intensity.
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Affiliation(s)
- Mahyar Mazloumi
- Nanomaterials Research Group, Materials and Energy Research Center, 14155-4777 Tehran, Iran.
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Nourmohammadi J, Sadrnezhaad SK, Ghader AB. Bone-like apatite layer formation on the new resin-modified glass-ionomer cement. J Mater Sci Mater Med 2008; 19:3507-3514. [PMID: 18622768 DOI: 10.1007/s10856-008-3501-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Accepted: 06/06/2008] [Indexed: 05/26/2023]
Abstract
In this study, the apatite-forming ability of the new resin-modified glass-ionomer cement was evaluated by soaking the cement in the simulated body fluid. The Fourier Transform Infrared (FTIR) spectrometer and X-Ray Diffraction (XRD) patterns of the soaked cement pointed to the creation of poorly crystalline carbonated apatite. It was found that the releasing of calcium ions from the soaked cement will dominate the undesirable effect of polyacrylic acid on apatite formation. Consequently, the ionic activity products (IAPs) of the apatite in the surrounding medium increased which accelerated apatite nucleation induced by the presence of the Si-OH and COOH groups. Accordingly, the apatite nuclei started to form via primary heterogeneous nucleation and continued by secondary nucleation. Therefore, nucleation and growth occurs as in the layer-by-layer mode so that finite numbers of monolayers are produced. Subsequent formation of film occurs by formation of discrete nuclei (layer-plus-island or SK growth).
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Affiliation(s)
- Jhamak Nourmohammadi
- Biomaterial Department, Material and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran.
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Manafi SA, Yazdani B, Rahimiopour MR, Sadrnezhaad SK, Amin MH, Razavi M. Synthesis of nano-hydroxyapatite under a sonochemical/hydrothermal condition. Biomed Mater 2008; 3:025002. [DOI: 10.1088/1748-6041/3/2/025002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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