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Linnik O, Popescu-Pelin G, Stefan N, Chorna N, Smirnova N, Mihailescu CN, Ristoscu C, Mihailescu IN. Investigation of nitrogen and iron co-doped TiO2 films synthesized in N2/CH4 via pulsed laser deposition technique. Appl Nanosci 2020. [DOI: 10.1007/s13204-020-01309-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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2
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Mihailescu IN, Bociaga D, Popescu-Pelin G, Stan GE, Duta L, Socol G, Chifiriuc MC, Bleotu C, Lazar V, Husanu MA, Zgura I, Miculescu F, Negut I, Hapenciuc C. Optimized silicon reinforcement of carbon coatings by pulsed laser technique for superior functional biomedical surfaces fabrication. Biofabrication 2017; 9:025029. [PMID: 28462910 DOI: 10.1088/1758-5090/aa7076] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We report on the fabrication of silicon-reinforced carbon (C:Si) structures by combinatorial pulsed laser deposition to search for the best design for a new generation of multi-functional coated implants. The synthesized films were characterized from the morphological, structural, compositional, mechanical and microbiological points of view. Scanning electron microscopy revealed the presence, on top of the deposited layers, of spheroid particulates with sizes in the micron range. No micro-cracks or delaminations were observed. Energy dispersive x-ray spectroscopy and grazing incidence x-ray diffraction pointed to the existence of a C to Si compositional gradient from one end of the film to the other. Raman investigation revealed a relatively high sp3 hybridization of up to 80% at 40-48 mm apart from the edge with higher C content. Si addition was demonstrated to significantly increase C:Si film bonding to the substrate, with values above the ISO threshold for coatings to be used in high-loading biomedical applications. Surface energy studies pointed to an increase in the hydrophilic character of the deposited structures along with Si content up to 52 mN m-1. In certain cases, the Si-reinforced C coatings elicited an antimicrobial biofilm action. The presence of Si was proven to be benign to HEp-2 cells of human origin, without interfering with their cellular cycle. On this basis, reliable C:Si structures with good adherence to the substrate and high efficiency against microbial biofilms can be developed for implant coatings and other advanced medical devices.
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Affiliation(s)
- I N Mihailescu
- National Institute for Lasers, Plasma and Radiation Physics, 077125 Magurele, Romania
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3
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Visan A, Stan GE, Ristoscu C, Popescu-Pelin G, Sopronyi M, Besleaga C, Luculescu C, Chifiriuc MC, Hussien MD, Marsan O, Kergourlay E, Grossin D, Brouillet F, Mihailescu IN. Combinatorial MAPLE deposition of antimicrobial orthopedic maps fabricated from chitosan and biomimetic apatite powders. Int J Pharm 2016; 511:505-515. [PMID: 27418570 DOI: 10.1016/j.ijpharm.2016.07.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/08/2016] [Accepted: 07/09/2016] [Indexed: 11/30/2022]
Abstract
Chitosan/biomimetic apatite thin films were grown in mild conditions of temperature and pressure by Combinatorial Matrix-Assisted Pulsed Laser Evaporation on Ti, Si or glass substrates. Compositional gradients were obtained by simultaneous laser vaporization of the two distinct material targets. A KrF* excimer (λ=248nm, τFWHM=25ns) laser source was used in all experiments. The nature and surface composition of deposited materials and the spatial distribution of constituents were studied by SEM, EDS, AFM, GIXRD, FTIR, micro-Raman, and XPS. The antimicrobial efficiency of the chitosan/biomimetic apatite layers against Staphylococcus aureus and Escherichia coli strains was interrogated by viable cell count assay. The obtained thin films were XRD amorphous and exhibited a morphology characteristic to the laser deposited structures composed of nanometric round shaped grains. The surface roughness has progressively increased with chitosan concentration. FTIR, EDS and XPS analyses indicated that the composition of the BmAp-CHT C-MAPLE composite films gradually modified from pure apatite to chitosan. The bioevaluation tests indicated that S. aureus biofilm is more susceptible to the action of chitosan-rich areas of the films, whilst the E. coli biofilm proved more sensible to areas containing less chitosan. The best compromise should therefore go, in our opinion, to zones with intermediate-to-high chitosan concentration which can assure a large spectrum of antimicrobial protection concomitantly with a significant enhancement of osseointegration, favored by the presence of biomimetic hydroxyapatite.
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Affiliation(s)
- A Visan
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - G E Stan
- National Institute of Materials Physics, 077125 Magurele-Ilfov, Romania
| | - C Ristoscu
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - G Popescu-Pelin
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - M Sopronyi
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - C Besleaga
- National Institute of Materials Physics, 077125 Magurele-Ilfov, Romania
| | - C Luculescu
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania
| | - M C Chifiriuc
- Department of Microbiology, Faculty of Biology, University of Bucharest, 060101 Bucharest, Romania; Earth, Environmental and Life Sciences Division, Research Institute of the University of Bucharest, 77206 Bucharest, Romania
| | - M D Hussien
- Department of Microbiology, Faculty of Biology, University of Bucharest, 060101 Bucharest, Romania; Earth, Environmental and Life Sciences Division, Research Institute of the University of Bucharest, 77206 Bucharest, Romania
| | - O Marsan
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - E Kergourlay
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - D Grossin
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - F Brouillet
- University of Toulouse, CIRIMAT, UPS INPT CNRS, ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France
| | - I N Mihailescu
- National Institute for Laser, Plasma and Radiation Physics, 077125 Magurele-Ilfov, Romania.
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Floroian L, Samoila C, Badea M, Munteanu D, Ristoscu C, Sima F, Negut I, Chifiriuc MC, Mihailescu IN. Stainless steel surface biofunctionalization with PMMA-bioglass coatings: compositional, electrochemical corrosion studies and microbiological assay. J Mater Sci Mater Med 2015; 26:195. [PMID: 26085116 DOI: 10.1007/s10856-015-5527-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 06/03/2015] [Indexed: 06/04/2023]
Abstract
A solution is proposed to surpass the inconvenience caused by the corrosion of stainless steel implants in human body fluids by protection with thin films of bioactive glasses or with composite polymer-bioactive glass nanostructures. Our option was to apply thin film deposition by matrix-assisted pulsed laser evaporation (MAPLE) which, to the difference to other laser or plasma techniques insures the protection of a more delicate material (a polymer in our case) against degradation or irreversible damage. The coatings composition, modification and corrosion resistance were investigated by FTIR and electrochemical techniques, under conditions which simulate their biological interaction with the human body. Mechanical testing demonstrates the adhesion, durability and resistance to fracture of the coatings. The coatings biocompatibility was assessed by in vitro studies and by flow cytometry. Our results support the unrestricted usage of coated stainless steel as a cheap alternative for human implants manufacture. They will be more accessible for lower prices in comparison with the majority present day fabrication of implants using Ti or Ti alloys.
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Affiliation(s)
- L Floroian
- Faculty of Electrical Engineering and Computer Science, Transilvania University of Brasov, 29 Eroilor Blvd, 500036, Brasov, Romania
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Grumezescu AM, Cristescu R, Chifiriuc MC, Dorcioman G, Socol G, Mihailescu IN, Mihaiescu DE, Ficai A, Vasile OR, Enculescu M, Chrisey DB. Fabrication of magnetite-based core-shell coated nanoparticles with antibacterial properties. Biofabrication 2015; 7:015014. [PMID: 25797361 DOI: 10.1088/1758-5090/7/1/015014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We report the fabrication of biofunctionalized magnetite core/sodium lauryl sulfate shell/antibiotic adsorption-shell nanoparticles assembled thin coatings by matrix assisted pulsed laser evaporation for antibacterial drug-targeted delivery. Magnetite nanoparticles have been synthesized and subsequently characterized by transmission electron microscopy and x-ray diffraction. The obtained thin coatings have been investigated by FTIR and scanning electron microscope, and tested by in vitro biological assays, for their influence on in vitro bacterial biofilm development and cytotoxicity on human epidermoid carcinoma (HEp2) cells.
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Affiliation(s)
- A M Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 1-7 Polizu Street, 011061, Bucharest, Romania
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Janković A, Eraković S, Ristoscu C, Mihailescu Serban N, Duta L, Visan A, Stan GE, Popa AC, Husanu MA, Luculescu CR, Srdić VV, Janaćković D, Mišković-Stanković V, Bleotu C, Chifiriuc MC, Mihailescu IN. Structural and biological evaluation of lignin addition to simple and silver-doped hydroxyapatite thin films synthesized by matrix-assisted pulsed laser evaporation. J Mater Sci Mater Med 2015; 26:5333. [PMID: 25578691 DOI: 10.1007/s10856-014-5333-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 07/28/2014] [Indexed: 06/04/2023]
Abstract
We report on thin film deposition by matrix-assisted pulsed laser evaporation of simple hydroxyapatite (HA) or silver (Ag) doped HA combined with the natural biopolymer organosolv lignin (Lig) (Ag:HA-Lig). Solid cryogenic target of aqueous dispersions of Ag:HA-Lig composite and its counterpart without silver (HA-Lig) were prepared for evaporation using a KrF* excimer laser source. The expulsed material was assembled onto TiO2/Ti substrata or silicon wafers and subjected to physical-chemical investigations. Smooth, uniform films adherent to substratum were observed. The chemical analyses confirmed the presence of the HA components, but also evidenced traces of Ag and Lig. Deposited HA was Ca deficient, which is indicative of a film with increased solubility. Recorded X-ray Diffraction patterns were characteristic for amorphous films. Lig presence in thin films was undoubtedly proved by both X-ray Photoelectron and Fourier Transform Infra-Red Spectroscopy analyses. The microbiological evaluation showed that the newly assembled surfaces exhibited an inhibitory activity both on the initial steps of biofilm forming, and on mature bacterial and fungal biofilm development. The intensity of the anti-biofilm activity was positively influenced by the presence of the Lig and/or Ag, in the case of Staphylococcus aureus, Pseudomonas aeruginosa and Candida famata biofilms. The obtained surfaces exhibited a low cytotoxicity toward human mesenchymal stem cells, being therefore promising candidates for fabricating implantable biomaterials with increased biocompatibility and resistance to microbial colonization and further biofilm development.
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Affiliation(s)
- A Janković
- Innovation Center, Faculty of Technology and Metallurgy, University of Belgrade, 11000, Belgrade, Serbia
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7
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Popa AC, Stan GE, Husanu MA, Pasuk I, Popescu ID, Popescu AC, Mihailescu IN. Multi-layer haemocompatible diamond-like carbon coatings obtained by combined radio frequency plasma enhanced chemical vapor deposition and magnetron sputtering. J Mater Sci Mater Med 2013; 24:2695-2707. [PMID: 23943017 DOI: 10.1007/s10856-013-5026-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Accepted: 07/28/2013] [Indexed: 06/02/2023]
Abstract
Radio-frequency Plasma Enhanced Chemical Vapour Deposition (in different methane dilutions) was used to synthesize adherent and haemocompatible diamond-like carbon (DLC) films on medical grade titanium substrates. The improvement of the adherence has been achieved by interposing a functional buffer layer with graded composition TixTiC1-x (x = 0-1) synthesized by magnetron co-sputtering. Bonding strength values of up to ~67 MPa have been measured by pull-out tests. Films with different sp(3)/sp(2) ratio have been obtained by changing the methane concentration in the deposition chamber. Raman spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction were employed for the physical-chemical characterization of the samples. The highest concentration of sp(3)-C (~87 %), corresponding to a lower DLC surface energy (28.7 mJ/m(2) ), was deposited in a pure methane atmosphere. The biological response of the DLC films was assayed by a state-of-the-art biological analysis method (surface enhanced laser desorption/ionization-time of flight mass spectroscopy), in conjunction with other dedicated testing techniques: Western blot and partial thromboplastin time. The data support a cause-effect relationship between sp(3)-C content, surface energy and coagulation time, as well as between platelet-surface adherence properties and protein adsorption profiles.
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Affiliation(s)
- A C Popa
- Army Centre for Medical Research, 020012, Bucharest, Romania
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Motoc MM, Axente E, Popescu C, Sima LE, Petrescu SM, Mihailescu IN, Gyorgy E. Active protein and calcium hydroxyapatite bilayers grown by laser techniques for therapeutic applications. J Biomed Mater Res A 2013; 101:2706-11. [DOI: 10.1002/jbm.a.34572] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 12/12/2012] [Indexed: 12/12/2022]
Affiliation(s)
- M. M. Motoc
- National Institute for Lasers; Plasma and Radiation Physics; 077125 Bucharest; Romania
| | - E. Axente
- National Institute for Lasers; Plasma and Radiation Physics; 077125 Bucharest; Romania
| | - C. Popescu
- National Institute for Lasers; Plasma and Radiation Physics; 077125 Bucharest; Romania
| | - L. E. Sima
- Institute of Biochemistry; Romanian Academy; Splaiul Independentei 296; 060031 Bucharest; Romania
| | - S. M. Petrescu
- Institute of Biochemistry; Romanian Academy; Splaiul Independentei 296; 060031 Bucharest; Romania
| | - I. N. Mihailescu
- National Institute for Lasers; Plasma and Radiation Physics; 077125 Bucharest; Romania
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Grigorescu S, Hindié M, Axente E, Carreiras F, Anselme K, Werckmann J, Mihailescu IN, Gallet O. Fabrication of functional fibronectin patterns by nanosecond excimer laser direct write for tissue engineering applications. J Mater Sci Mater Med 2013; 24:1809-1821. [PMID: 23615786 DOI: 10.1007/s10856-013-4927-0] [Citation(s) in RCA: 1] [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] [Received: 11/20/2012] [Accepted: 04/06/2013] [Indexed: 06/02/2023]
Abstract
Laser direct write techniques represent a prospective alternative for engineering a new generation of hybrid biomaterials via the creation of patterns consisting of biological proteins onto practically any type of substrate. In this paper we report on the characterization of fibronectin features obtained onto titanium substrates by UV nanosecond laser transfer. Fourier-transform infrared spectroscopy measurements evidenced no modification in the secondary structure of the post-transferred protein. The molecular weight of the transferred protein was identical to the initial fibronectin, no fragment bands being found in the transferred protein's Western blot migration profile. The presence of the cell-binding domain sequence and the mannose groups within the transferred molecules was revealed by anti-fibronectin monoclonal antibody immunolabelling and FITC-Concanavalin-A staining, respectively. The in vitro tests performed with MC3T3-E1 osteoblast-like cells and Swiss-3T3 fibroblasts showed that the cells' morphology and spreading were strongly influenced by the presence of the fibronectin spots.
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Affiliation(s)
- S Grigorescu
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, Université de Cergy-Pontoise, 2 Av. Adolphe Chauvin, 95302, Cergy Pontoise, France.
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10
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Mihaiescu DE, Cristescu R, Dorcioman G, Popescu CE, Nita C, Socol G, Mihailescu IN, Grumezescu AM, Tamas D, Enculescu M, Negrea RF, Ghica C, Chifiriuc C, Bleotu C, Chrisey DB. Functionalized magnetite silica thin films fabricated by MAPLE with antibiofilm properties. Biofabrication 2012; 5:015007. [PMID: 23254399 DOI: 10.1088/1758-5082/5/1/015007] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
We report on the fabrication of magnetite/salicylic acid/silica shell/antibiotics (Fe(3)O(4)/SA/SiO(2)/ATB) thin films by matrix-assisted pulsed laser evaporation (MAPLE) to inert substrates. Fe(3)O(4)-based powder have been synthesized and investigated by XRD and TEM. All thin films were studied by FTIR, SEM and in vitro biological assays using Staphylococcus aureus and Pseudomonas aeruginosa reference strains, as well as eukaryotic HEp-2 cells. The influence of the obtained nanosystems on the microbial biofilm development as well as their biocompatibility has been assessed. For optimum deposition conditions, we obtained uniform adherent films with the composition identical with the raw materials. Fe(3)O(4)/SA/SiO(2)/ATB thin films had an inhibitory activity on the ability of microbial strains to initiate and develop mature biofilms, in a strain- and antibiotic-dependent manner. These magnetite silica thin films are promising candidates for the development of novel materials designed for the inhibition of medical biofilms formed by different pathogenic agents on common substrates, frequently implicated in the etiology of chronic and hard to treat infections.
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Affiliation(s)
- D E Mihaiescu
- Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 1-7 Polizu Street, Bucharest, Romania
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11
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Sima LE, Filimon A, Piticescu RM, Chitanu GC, Suflet DM, Miroiu M, Socol G, Mihailescu IN, Neamtu J, Negroiu G. Specific biofunctional performances of the hydroxyapatite-sodium maleate copolymer hybrid coating nanostructures evaluated by in vitro studies. J Mater Sci Mater Med 2009; 20:2305-2316. [PMID: 19543854 DOI: 10.1007/s10856-009-3800-7] [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] [Received: 12/15/2008] [Accepted: 06/04/2009] [Indexed: 05/27/2023]
Abstract
The nanohybrid structures consisting of hydroxyapatite (HA) and sodium maleate-vinyl acetate copolymer (MP) deposited by Matrix Assisted Pulsed Laser Evaporation (MAPLE) technique on Ti surfaces were investigated for specific biological qualities required in bone implantology. The data from in vitro studies demonstrated that human primary osteoblasts (OBs) firmly adhered to Ti coated with HA-MP as indicated by cytoskeleton and vinculin dynamics. OBs spread onto biomaterial surface and formed groups of cells which during their biosynthetic activity expressed OB phenotype specific markers (collagen and non-collagenous proteins) and underwent controlled proliferation.
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Affiliation(s)
- L E Sima
- Institute of Biochemistry, Romanian Academy, Splaiul Independentei 296, Bucharest 060031, Romania
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Capuccini C, Torricelli P, Sima F, Boanini E, Ristoscu C, Bracci B, Socol G, Fini M, Mihailescu IN, Bigi A. Strontium-substituted hydroxyapatite coatings synthesized by pulsed-laser deposition: in vitro osteoblast and osteoclast response. Acta Biomater 2008; 4:1885-93. [PMID: 18554996 DOI: 10.1016/j.actbio.2008.05.005] [Citation(s) in RCA: 286] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2007] [Revised: 04/30/2008] [Accepted: 05/09/2008] [Indexed: 11/28/2022]
Abstract
The increasing interest in strontium incorporation into biomaterials for hard tissue repair is justified by the growing evidence of its beneficial effect on bone. We successfully synthesized hydroxyapatite (HA) thin films with different extents of strontium substitution for calcium (0, 1, 3 or 7 at.%) by pulsed-laser deposition. The coatings displayed a granular surface and a good degree of crystallinity, which slightly diminished as strontium content increased. Osteoblast-like MG63 cells and human osteoclasts were cultured on the thin films up to 21 days. MG63 cells grown on the strontium-doped HA coatings displayed normal morphology, good proliferation and increased values of the differentiation parameters, whereas the number of osteoclasts was negatively influenced by the presence of strontium. The positive effect of the ion on bone cells was particularly evident in the case of coatings deposited from HA at relatively high strontium contents (3-7%), where significantly increased values of alkaline phosphatase activity, osteocalcin, type I collagen and osteoprotegerin/TNF-related activation-induced cytokine receptor ratio, and considerably reduced values of osteoclast proliferation, were observed.
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Affiliation(s)
- C Capuccini
- Department of Chemistry G. Ciamician, University of Bologna, 40126 Bologna, Italy
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György E, Axente E, Mihailescu IN, Predoi D, Ciuca S, Neamtu J. Creatinine biomaterial thin films grown by laser techniques. J Mater Sci Mater Med 2008; 19:1335-9. [PMID: 17914621 DOI: 10.1007/s10856-007-3254-8] [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] [Received: 02/01/2007] [Accepted: 08/02/2007] [Indexed: 05/17/2023]
Abstract
Creatinine thin films were synthesised by matrix assisted pulsed laser deposition (PLD) techniques for enzyme-based biosensor applications. An UV KrF* (lambda=248 nm, tau approximately 10 ns) excimer laser source was used for the irradiation of the targets at incident fluence values in the 0.3-0.5 J/cm2 range. For the matrix assisted PLD the targets consisted on a frozen composite obtained by dissolving the biomaterials in distilled water. The surface morphology, chemical composition and structure of the obtained biomaterial thin films were investigated by scanning electron microscopy, Fourier transform infrared spectroscopy, and electron dispersive X-ray spectroscopy as a function of the target preparation procedure and incident laser fluence.
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Affiliation(s)
- E György
- National Institute for Lasers, Plasma and Radiations Physics, P.O. Box MG 36, Bucharest 77125, Romania.
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György E, Sima F, Mihailescu IN, Smausz T, Megyeri G, Kékesi R, Hopp B, Zdrentu L, Petrescu SM. Immobilization of urease by laser techniques: Synthesis and application to urea biosensors. J Biomed Mater Res A 2008; 89:186-91. [DOI: 10.1002/jbm.a.31963] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Cristescu R, Jelinek M, Kocourek T, Axente E, Grigorescu S, Moldovan A, Mihaiescu DE, Albulescu M, Buruiana T, Dybal J, Stamatin I, Mihailescu IN, Chrisey DB. Matrix assisted pulsed laser evaporation of pullulan tailor-made biomaterial thin films for controlled drug delivery systems. ACTA ACUST UNITED AC 2007. [DOI: 10.1088/1742-6596/59/1/031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tortet L, Guinneton F, Monnereau O, Stanoi D, Socol G, Mihailescu IN, Zhang T, Grigorescu C. Optimization of Cr8O21 targets for Pulsed Laser Deposition. Cryst Res Technol 2005. [DOI: 10.1002/crat.200410503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Werckmann J, Carradò A, Joulié S, Schmerber G, Faerber J, Ristoscu C, Dorcioman G, Grigorescu S, Mihailescu IN. Pulsed laser deposition growth of thin hydroxyapatite layers on titanium substrates. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305082516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Bigi A, Bracci B, Cuisinier F, Elkaim R, Fini M, Mayer I, Mihailescu IN, Socol G, Sturba L, Torricelli P. Human osteoblast response to pulsed laser deposited calcium phosphate coatings. Biomaterials 2005; 26:2381-9. [PMID: 15585241 DOI: 10.1016/j.biomaterials.2004.07.057] [Citation(s) in RCA: 156] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2004] [Accepted: 07/23/2004] [Indexed: 11/16/2022]
Abstract
Octacalcium phosphate (OCP) and Mn(2+)-doped carbonate hydroxyapatite (Mn-CHA) thin films were deposited on pure, highly polished and chemically etched Ti substrates with pulsed laser deposition. The coatings exhibit different composition, crystallinity and morphology that might affect their osteoconductivity. Human osteoblasts were cultured on the surfaces of OCP and Mn-CHA thin films, and the cell attachment, proliferation and differentiation were evaluated up to 21 days. The cells showed a normal morphology and a very good rate of proliferation and viability in every experimental time. Alkaline phosphatase activity was always higher than the control and Ti groups. From days 7 to 21 collagen type I production was higher in comparison with control and Ti groups. The level of transforming growth factor beta 1 (TGF-beta1) was lower at 3 and 7 days, but reached the highest values during following experimental times (14 and 21 days). Our data demonstrate that both calcium phosphate coatings favour osteoblasts proliferation, activation of their metabolism and differentiation.
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Affiliation(s)
- A Bigi
- Department of Chemistry "G. Ciamician", University of Bologna, via Selmi, 2, Bologna 40126, Italy.
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György E, Toricelli P, Socol G, Iliescu M, Mayer I, Mihailescu IN, Bigi A, Werckman J. Biocompatible Mn2+-doped carbonated hydroxyapatite thin films grown by pulsed laser deposition. J Biomed Mater Res A 2004; 71:353-8. [PMID: 15372467 DOI: 10.1002/jbm.a.30172] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mn(2+)-doped carbonated hydroxyapatite (Mn-CHA) thin films were obtained by pulsed laser deposition on Ti substrates. The results of the performed complementary diagnostic techniques, X-ray diffraction, infrared spectroscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy investigations indicate that the films are crystalline with a Ca/P ratio of about 1.64-1.66. The optimum conditions, when nearly stoichiometric crystalline thin films were deposited, were found to be 10 Pa oxygen pressure, 400 degrees C substrate temperature, and postdeposition heat treatment in water vapors at the same substrate temperature. The films were seeded with L929 fibroblast and hFOB1.19 osteoblast cells and subjected to in vitro tests. Both fibroblast and osteoblast cells have a good adherence on the Mn-CHA film and on the Ti or polystyrene references. Proliferation and viability tests showed that osteoblast cells growth on Mn-CHA-coated Ti was enhanced as compared to uncoated pure Ti surfaces. Caspase-1 activity was not affected significantly by the material, showing that Mn-CHA does not induce apoptosis of cultured cells. These results demonstrate that Mn-CHA films on Ti should provoke a faster osteointegration of the coated implants as compared to pure Ti. (c) 2004 Wiley Periodicals, Inc. J Biomed Mater Res 71A: 353-358, 2004.
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Affiliation(s)
- E György
- National Institute for Lasers, Plasma and Radiation Physics, 77125 Bucharest-Magurele, Romania
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Socol G, Torricelli P, Bracci B, Iliescu M, Miroiu F, Bigi A, Werckmann J, Mihailescu IN. Biocompatible nanocrystalline octacalcium phosphate thin films obtained by pulsed laser deposition. Biomaterials 2004; 25:2539-45. [PMID: 14751739 DOI: 10.1016/j.biomaterials.2003.09.044] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We extended for the first time pulsed laser ablation to the deposition of octacalcium phosphate Ca8H2(PO4)6.5H2O (OCP) thin films. The depositions were performed with a pulsed UV laser source (lambda=248 nm, tau> or =20 ns) in a flux of hot water vapors. The targets were sintered from crystalline OCP powder and the laser ablation fluence was set at values of 1.5-2 J/cm2. During depositions the collectors, Si or Ti substrates, were maintained at a constant temperature within the range 20-200 degrees C. The resulting structures were submitted to heat treatment in hot water vapors for up to 6 h. The best results were obtained at a substrate temperature of 150 degrees C during both deposition and post-deposition treatment. High-resolution electron microscopy and XRD at grazing incidence indicated that the coatings obtained were made of nanocrystalline OCP. Cross-section TEM investigations showed that the coatings contained droplets stacked on Ti substrates as well as distributed across the entire thickness of the arborescence-like structure layers. The results of WST-1 assay, cell adherence, DNA replication, and caspase-1 activity confirmed the good biocompatibility of the coatings.
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Affiliation(s)
- G Socol
- National Institute for Lasers, Plasma and Radiation Physics, 77125 Bucharest-Magurele, Romania
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21
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Nelea V, Pelletier H, Iliescu M, Werckmann J, Craciun V, Mihailescu IN, Ristoscu C, Ghica C. Calcium phosphate thin film processing by pulsed laser deposition and in situ assisted ultraviolet pulsed laser deposition. J Mater Sci Mater Med 2002; 13:1167-1173. [PMID: 15348661 DOI: 10.1023/a:1021150207350] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Calcium orthophosphates (CaP) and hydroxyapatite (HA) were intensively studied in order to design and develop a new generation of bioactive and osteoconductive bone prostheses. The main drawback now in the CaP and HA thin films processing persists in their poor mechanical characteristics, namely hardness, tensile and cohesive strength, and adherence to the metallic substrate. We report here a critical comparison between the microstructure and mechanical properties of HA and CaP thin films grown by two methods. The films were grown by KrF* pulsed laser deposition (PLD) or KrF* pulsed laser deposition assisted by in situ ultraviolet radiation emitted by a low pressure Hg lamp (UV-assisted PLD). The PLD films were deposited at room temperature, in vacuum on Ti-5Al-2.5Fe alloy substrate previously coated with a TiN buffer layer. After deposition the films were annealed in ambient air at 500-600 degrees C. The UV-assisted PLD films were grown in (10(-2)-10(-1) Pa) oxygen directly on Ti-5Al-2.5Fe substrates heated at 500-600 degrees C. The films grown by classical PLD are crystalline and stoichiometric. The films grown by UV-assisted PLD were crystalline and exhibit the best mechanical characteristics with values of hardness and Young modulus of 6-7 and 150-170 GPa, respectively, which are unusually high for the calcium phosphate ceramics. To the difference of PLD films, in the case of UV-assisted PLD, the GIXRD spectra show the decomposition of HA in Ca(2)P(2)O(7), Ca(2)P(2)O(9) and CaO. The UV lamp radiation enhanced the gas reactivity and atoms mobility during processing, increasing the tensile strength of the film, while the HA structure was destroyed.
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Affiliation(s)
- V Nelea
- Laboratoire d'Ingénierie de Surface, Ecole Nationale Supérieure des Arts et Industries, 24 Bld. de la Victoire, F-67084, Strasbourg, France.
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Ursu I, Alexandrescu R, Mihailescu IN, Morjan I, Jianu V, Popescu C. Kinetic evolution during the laser/thermal preparation of Mn3O4from MnCO3. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0022-3700/19/23/003] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [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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24
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Pavel E, Mihailescu IN, Hening A, Vlad VI, Tugulea L, Diamandescu L, Bibicu I, Chipara M. Three-dimensional memory effect in fluorescent photosensitive glass activated by europium and cerium. Opt Lett 1998; 23:1304-1306. [PMID: 18087506 DOI: 10.1364/ol.23.001304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The persistent extinction of fluorescence emission of Eu(3+) in glasses activated with europium and cerium is reported for the first time to the authors' knowledge. The glass samples containing Eu(3+) and Ce(3+) were initially colorless and transparent and exhibited intense emission peaks at 592 and 612 nm assigned to the (5)D(0)-(7)F(1, 2) transitions of Eu(3+). The complete extinction of the Eu(3+)-ion emission was obtained as an effect of multipulse excimer-UV-laser (lambda = 248 nm, tau(FWHM) >/= 20 ns) irradiation of the glass samples. Fluorescence microscopy, Mössbauer spectrometry, and electron spin resonance were applied for investigation of the modifications induced by the laser treatment. As a decisive proof of the extinction of fluorescence we succeeded in recording three-dimensional fluorescent photographic patterns within the activated samples.
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Barborica A, Mihailescu IN, Teodorescu VS. Dynamical evolution of the surface microrelief under multiple-pulse-laser irradiation: An analysis based on surface-scattered waves. Phys Rev B Condens Matter 1994; 49:8385-8395. [PMID: 10009607 DOI: 10.1103/physrevb.49.8385] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Dima FV, Vasiliu V, Mihailescu IN, Dima SV, Stirbet M, Popa A, Lacky D. DOSE-RELATED IMMUNOLOGICAL AND MORPHOLOGICAL CHANGES OBSERVED IN RATS WITH WALKER-256 CARCINOSARCOMA AFTER PHOTODYNAMIC THERAPY: A CONTROLLED STUDY. Laser Ther 1991. [DOI: 10.5978/islsm.91-or-22] [Citation(s) in RCA: 3] [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: 11/06/2022]
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27
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Ursu I, Dorobantu IA, Mihailescu IN, Vlad M, Spineanu F, Prokhorov AM, Konov VI, Tokarev VN. Possible mechanism for laser-induced two-dimensional periodic structures by analogy with the Bénard effect. Opt Lett 1989; 14:853-855. [PMID: 19752990 DOI: 10.1364/ol.14.000853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An explanation is presented for the formation of periodic structures on solid surfaces under powerful laser irradiation through an analogy to the Bénard effect.
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Florescu V, Schneider I, Mihailescu IN. Comment on "Lifetime of excited atomic states". Phys Rev A Gen Phys 1988; 38:2189-2191. [PMID: 9900624 DOI: 10.1103/physreva.38.2189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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29
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Ursu I, Mihailescu IN, Gutu I, Hening A, Julea T, Nistor LC, Popescu M, Teodorescu VS, Prokhorov AM, Konov VI, Ralchenko VG. Surface nitridation of zirconium and hafnium by powerful cw CO2 laser irradiation in air. Appl Opt 1986; 25:2720. [PMID: 18231549 DOI: 10.1364/ao.25.002720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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30
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Ursu I, Mihailescu IN, Nistor LC, Teodorescu VS, Prokhorov AM, Konov VI, Uglov SA. Zirconium and titanium nitridation by repeated action of a breakdown plasma induced in nitrogen as a result of microsecond-pulsed TEA CO2 laser irradiation. Appl Opt 1986; 25:2725. [PMID: 18231550 DOI: 10.1364/ao.25.002725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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31
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Costescu A, Aaron FD, Schneider I, Mihailescu IN. Simple method for obtaining exact nonrelativistic formulas for two-photon (n, l, m) continuum dipole transitions for hydrogenic atoms. Opt Lett 1986; 11:449-450. [PMID: 19730660 DOI: 10.1364/ol.11.000449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The Kramers-Heisenberg matrix element for two-photon transitions between a bound (n, l, m) state and a continuum is obtained in terms of the Coulomb Green's function matrix element for the ground-state ? continuum transition. The number of the F(1) Appell functions involved is minimized. The analytical results for the ns ? continuum transitions are given, and both the resonant behavior and the transparency region of the two-photon cross section are predicted.
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Ursu I, Mihailescu IN, Nistor LC, Teodorescu VS, Prokhorov AM, Konov VI, Tokarev VN. Periodic structures on the surface of fused silica under multipulse 10.6-[mgr ]m laser irradiation. Appl Opt 1985; 24:3736. [PMID: 18224112 DOI: 10.1364/ao.24.003736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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33
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Ursu I, Nanu L, Dinescu M, Hening A, Mihailescu IN, Nistor LC, Teodorescu VS, Szil E, Hevesi I, Kovacs J, Nanai L. Vanadium oxidation as a result of cw CO2 laser irradiation in atmospheric air. ACTA ACUST UNITED AC 1984. [DOI: 10.1007/bf00620638] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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