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Guida P, Piscitelli E, Marrese M, Martino V, Cirillo V, Guarino V, Angeli E, Cocola C, Pelucchi P, Repetto L, Firpo G, Karnavas T, Gotte M, Gritzapis A, D'Albore M, Repetto D, Pezzuoli D, Missitzis I, Porta G, Bertalot G, Bellipanni G, Zucchi I, Ambrosio L, Valbusa U, Reinbold RA. Integrating Microstructured Electrospun Scaffolds in an Open Microfluidic System for in Vitro Studies of Human Patient-Derived Primary Cells. ACS Biomater Sci Eng 2020; 6:3649-3663. [PMID: 33463182 DOI: 10.1021/acsbiomaterials.0c00352] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Recent studies have suggested that microenvironmental stimuli play a significant role in regulating cellular proliferation and migration, as well as in modulating self-renewal and differentiation processes of mammary cells with stem cell (SCs) properties. Recent advances in micro/nanotechnology and biomaterial synthesis/engineering currently enable the fabrication of innovative tissue culture platforms suitable for maintenance and differentiation of SCs in vitro. Here, we report the design and fabrication of an open microfluidic device (OMD) integrating removable poly(ε-caprolactone) (PCL) based electrospun scaffolds, and we demonstrate that the OMD allows investigation of the behavior of human cells during in vitro culture in real time. Electrospun scaffolds with modified surface topography and chemistry can influence attachment, proliferation, and differentiation of mammary SCs and epigenetic mechanisms that maintain luminal cell identity as a function of specific morphological or biochemical cues imparted by tailor-made fiber post-treatments. Meanwhile, the OMD architecture allows control of cell seeding and culture conditions to collect more accurate and informative in vitro assays. In perspective, integrated systems could be tailor-made to mimic specific physiological conditions of the local microenvironment and then analyze the response from screening specific drugs for more effective diagnostics, long-term prognostics, and disease intervention in personalized medicine.
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Affiliation(s)
- Patrizia Guida
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Eleonora Piscitelli
- Institute of Biomedical Technologies, National Research Council of Italy, via F.lli Cervi 93, 20090 Segrate, Milan, Italy
| | - Marica Marrese
- Institute of Composite and Biomedical Materials, National Research Council of Italy, Mostra D'Oltremare, Pad. 20, viale Kennedy 54, 80125 Naples, Italy
| | - Valentina Martino
- Institute of Biomedical Technologies, National Research Council of Italy, via F.lli Cervi 93, 20090 Segrate, Milan, Italy
| | - Valentina Cirillo
- Institute of Composite and Biomedical Materials, National Research Council of Italy, Mostra D'Oltremare, Pad. 20, viale Kennedy 54, 80125 Naples, Italy
| | - Vincenzo Guarino
- Institute for Polymers, Composites & Biomaterials, National Research Council of Italy, Mostra d'Oltremare, Pad. 20, viale Kennedy 54, 80125 Naples, Italy
| | - Elena Angeli
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Cinzia Cocola
- Institute of Biomedical Technologies, National Research Council of Italy, via F.lli Cervi 93, 20090 Segrate, Milan, Italy.,Consorzio Italbiotech, via Fantoli 15/16, 20138 Milan, Italy
| | - Paride Pelucchi
- Institute of Biomedical Technologies, National Research Council of Italy, via F.lli Cervi 93, 20090 Segrate, Milan, Italy
| | - Luca Repetto
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Giuseppe Firpo
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Theodoros Karnavas
- Columbia University, Department of Genetics & Development, New York, 10032 United States
| | - Martin Gotte
- Department of Gynecology and Obstetrics, Münster University Hospital, 48149 Münster, Germany
| | - Angelos Gritzapis
- Department of Breast Cancer Surgery, Hospital "Agios Savvas", Leoforos Alexandras Avenue, 171, 11522 Athens, Greece
| | - Marietta D'Albore
- Institute of Composite and Biomedical Materials, National Research Council of Italy, Mostra D'Oltremare, Pad. 20, viale Kennedy 54, 80125 Naples, Italy
| | - Diego Repetto
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Denise Pezzuoli
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Ioannis Missitzis
- Department of Breast Cancer Surgery, Hospital "Agios Savvas", Leoforos Alexandras Avenue, 171, 11522 Athens, Greece
| | - Giovanni Porta
- Department of Medicine and Surgery, University of Insubria, Varese, Italy
| | - Giovanni Bertalot
- IEO, European Institute of Oncology IRCCS, via G Ripamonti, 435, 20141 Milan, Italy
| | - Gianfranco Bellipanni
- Center for Biotechnology, Sbarro Institute for Research and Molecular Medicine and Department of Biology, Temple University, Philadelphia 19122, United States
| | - Ileana Zucchi
- Institute of Biomedical Technologies, National Research Council of Italy, via F.lli Cervi 93, 20090 Segrate, Milan, Italy
| | - Luigi Ambrosio
- Institute for Polymers, Composites & Biomaterials, National Research Council of Italy, Mostra d'Oltremare, Pad. 20, viale Kennedy 54, 80125 Naples, Italy
| | - Ugo Valbusa
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Rolland A Reinbold
- Institute of Biomedical Technologies, National Research Council of Italy, via F.lli Cervi 93, 20090 Segrate, Milan, Italy
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Pezzuoli D, Angeli E, Repetto D, Ferrera F, Guida P, Firpo G, Repetto L. Nanofluidic-Based Accumulation of Antigens for Miniaturized Immunoassay. Sensors (Basel) 2020; 20:s20061615. [PMID: 32183234 PMCID: PMC7146560 DOI: 10.3390/s20061615] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 01/29/2023]
Abstract
The continuous advances of Nanofluidics have been stimulating the development of novel nanostructures and strategies to accumulate very diluted analytes, for implementing a new class of high sensitivity miniaturized polymeric sensors. We take advantage of the electrokinetic properties of these structures, which allow accumulating analytes inside asymmetric microfluidic structures to implement miniaturized sensors able to detect diluted solutions down to nearly 1.2 pg/mL. In particular, exploiting polydimethylsiloxane devices, fabricated by using the junction gap breakdown technique, we concentrate antigens inside a thin microfunnel functionalized with specific antibodies to favor the interaction and, if it is the case, the recognition between antigens in solution and antibodies anchored to the surface. The transduction mechanism consists in detecting the fluorescence signal of labeled avidin when it binds to biotinylated antigens. Here, we demonstrate that exploiting these electrokinetic phenomena, typical of nanofluidic structures, we succeeded in concentrating biomolecules in correspondence of a 1 pL sensing region, a strategy that grants to the device performance comparable to standard immunoassays.
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Affiliation(s)
- Denise Pezzuoli
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Elena Angeli
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
- Correspondence:
| | - Diego Repetto
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Francesca Ferrera
- Centre of Excellence for Biomedical Research, University of Genoa, viale Benedetto XV 9, 16132 Genoa, Italy
| | - Patrizia Guida
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Giuseppe Firpo
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Luca Repetto
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
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Pezzuoli D, Angeli E, Repetto D, Guida P, Firpo G, Repetto L. Increased Flexibility in Lab-on-Chip Design with a Polymer Patchwork Approach. Nanomaterials (Basel) 2019; 9:nano9121678. [PMID: 31775220 PMCID: PMC6955689 DOI: 10.3390/nano9121678] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/19/2019] [Accepted: 11/20/2019] [Indexed: 12/14/2022]
Abstract
Nanofluidic structures are often the key element of many lab-on-chips for biomedical and environmental applications. The demand for these devices to be able to perform increasingly complex tasks triggers a request for increasing the performance of the fabrication methods. Soft lithography and poly(dimethylsiloxane) (PDMS) have since long been the basic ingredients for producing low-cost, biocompatible and flexible devices, replicating nanostructured masters. However, when the desired functionalities require the fabrication of shallow channels, the “roof collapse” phenomenon, that can occur when sealing the replica, can impair the device functionalities. In this study, we demonstrate that a “focused drop-casting” of h-PDMS (hard PDMS) on nanostructured regions, provides the necessary stiffness to avoid roof collapse, without increasing the probability of deep cracks formation, a drawback that shows up in the peel-off step, when h-PDMS is used all over the device area. With this new approach, we efficiently fabricate working devices with reproducible sub-100 nm structures. We verify the absence of roof collapse and deep cracks by optical microscopy and, in order to assess the advantages that are introduced by the proposed technique, the acquired images are compared with those of cracked devices, whose top layer, of h-PDMS, and with those of collapsed devices, made of standard PDMS. The geometry of the critical regions is studied by atomic force microscopy of their resin casts. The electrical resistance of the nanochannels is measured and shown to be compatible with the estimates that can be obtained from the geometry. The simplicity of the method and its reliability make it suitable for increasing the fabrication yield and reducing the costs of nanofluidic polymeric lab-on-chips.
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Giordano MC, Repetto D, Mennucci C, Carrara A, Mongeot FBD. Template-assisted growth of transparent plasmonic nanowire electrodes. Nanotechnology 2016; 27:495201. [PMID: 27827344 DOI: 10.1088/0957-4484/27/49/495201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Self-organized nanowire arrays are confined by glancing-angle Au deposition on nanopatterned glass templates prepared by ion beam sputtering. The semi-transparent 1D nanowire arrays are extended over large cm2 areas and are endowed with excellent electrical conductivity competitive with the best transparent conductive oxides (sheet resistance in the range of 5-20 Ohm sq-1). In addition, the nanowires support localized surface plasmon (LSP) resonances, which are easily tunable into the visible and near infrared spectrum and are selectively excited with incident light polarized perpendicularly to the wires. Such substrates, thus, behave as multifunctional nanoelectrodes, which combine good optoelectronic performance with dichroic plasmonic excitation. The electrical percolation process of the Au nanoelectrodes was monitored in situ during growth at glancing angle, both on flat and nanopatterned glass templates. In the first case, we observed a universal scaling of the differential percolation rate, independently of the glancing deposition angle, while deviations from the universal scaling were observed when Au was confined on nanopatterned templates. In the latter case, the pronounced shadowing effect promotes the growth of locally connected 1D Au nanosticks on the 'illuminated' ripple ridges, thus, introducing strong anisotropies with respect to the case of a 2D percolating network.
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Gnecco E, Nita P, Casado S, Pimentel C, Mougin K, Giordano MC, Repetto D, de Mongeot FB. Channeling motion of gold nanospheres on a rippled glassed surface. Nanotechnology 2014; 25:485302. [PMID: 25396680 DOI: 10.1088/0957-4484/25/48/485302] [Citation(s) in RCA: 2] [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: 05/28/2023]
Abstract
Gold nanospheres have been manipulated by atomic force microscopy on a rippled glass surface produced by ion beam sputtering and coated with an ultrathin (10 nm thick) graphitic layer. This substrate is characterized by irregular wavy grooves running parallel to a preferential direction. Measurements in ambient conditions show that the motion of the nanoparticles is confined to single grooves ('channels'), along which the particles move till they are trapped by local bottlenecks. At this point, the particles cross the ripple pattern in a series of consecutive jumps and continue their longitudinal motion along a different channel. Moreover, due to the asymmetric shape of the ripple profiles, the jumps occur in the direction of minimum slope, resembling a ratchet mechanism. Our results are discussed, extending a collisional model, which was recently developed for the manipulation of nanospheres on flat surfaces, to the specific geometry of this problem.
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Affiliation(s)
- Enrico Gnecco
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nanociencia), Campus Universitario de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
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Fernández-Hernández JM, De Cola L, Bolink HJ, Clemente-León M, Coronado E, Forment-Aliaga A, López-Muñoz A, Repetto D. White light-emitting electrochemical cells based on the Langmuir-Blodgett technique. Langmuir 2014; 30:14021-14029. [PMID: 25347390 DOI: 10.1021/la503144v] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Light-emitting electrochemical cells (LECs) showing a white emission have been prepared with Langmuir-Blodgett (LB) films of the metallosurfactant bis[2-(2,4-difluorophenyl)pyridine][2-(1-hexadecyl-1H-1,2,3-triazol-4-yl)pyridine]iridium(III) chloride (1), which work with an air-stable Al electrode. They were prepared by depositing a LB film of 1 on top of a layer of poly(N,N'-diphenyl-N,N'-bis(4-hexylphenyl)-[1,1'-biphenyl]-4,4'-diamine (pTPD) spin-coated on indium tin oxide (ITO). The white color of the electroluminescence of the device contrasts with the blue color of the photoluminescence of 1 in solution and within the LB films. Furthermore, the crystal structure of 1 is reported together with the preparation and characterization of the Langmuir monolayers (π-A compression isotherms and Brewster angle microscopy (BAM)) and LB films of 1 (IR, UV-vis and emission spectroscopy, X-ray photoelectron spectroscopy (XPS), specular X-ray reflectivity (SXR), and atomic force microscopy (AFM)).
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Affiliation(s)
- Jesús M Fernández-Hernández
- Physicalisches Institut and Center for Nanotechnology (CeNTech), Westfälische Wilhelms-Universität Münster , Heisenbergstrasse 11, 48149 Münster, Germany
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Clemente-León M, Coronado E, López-Muñoz A, Repetto D, Catala L, Mallah T. Patterning of magnetic bimetallic coordination nanoparticles of Prussian blue derivatives by the Langmuir-Blodgett technique. Langmuir 2012; 28:4525-4533. [PMID: 22316131 DOI: 10.1021/la2049508] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report a novel method to prepare patterns of nanoparticles over large areas of the substrate. This method is based on the adsorption of the negatively charged nanoparticles dispersed in an aqueous subphase onto a monolayer of the phospholipid dipalmitoyl-l-α-phosphatidylcholine (DPPC) at the air-water interface. It has been used to prepare patterns of nanoparticles of Prussian blue analogues (PBA) of different size (K(0.25)Ni[Fe(CN)(6)](0.75) (NiFe), K(0.25)Ni[Cr(CN)(6)](0.75) (NiCr), K(0.25)Ni[Co(CN)(6)](0.75) (NiCo), Cs(0.4)Co[Cr(CN)(6)](0.8) (CsCoCr), and Cs(0.4)Co[Fe(CN)(6)](0.9) (CsCoFe)). The behavior of DPPC monolayer at the air-water interface in the presence of the subphase of PBA nanoparticles has been studied by the compression isotherms and Brewster angle microscopy (BAM) images. Atomic force microscopy (AFM) of the transferred films on mica substrates shows that patterns of the nanoparticles are observed for a 10(-4) M concentration of the subphase, based on the nanoparticle precursors, at surface pressures between 1 and 6 mN/m and transfer velocities from 10 to 80 mm/min. Vertical, horizontal, or tilted fringes of the nanoparticles with respect to the transfer direction can be obtained depending on the transfer velocity and surface pressure.
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Volatron F, Heurtaux D, Catala L, Mathonière C, Gloter A, Stéphan O, Repetto D, Clemente-León M, Coronado E, Mallah T. Photo-induced magnetic bistability in a controlled assembly of anisotropic coordination nanoparticles. Chem Commun (Camb) 2011; 47:1985-7. [DOI: 10.1039/c0cc04940a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bolink HJ, Baranoff E, Clemente-León M, Coronado E, Lardiés N, López-Muñoz A, Repetto D, Nazeeruddin MK. Dual-emitting Langmuir-Blodgett film-based organic light-emitting diodes. Langmuir 2010; 26:11461-11468. [PMID: 20486649 DOI: 10.1021/la100956w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Langmuir-Blodgett (LB) films containing alternating layers of the metallosurfactants bis(4,4'-tridecyl-2,2'-bipyridine)-(4,4'-dicarboxy-2,2'-bipyridine) ruthenium(II)-bis(chloride) (1) and bis[2-(2,4-difluorophenyl)pyridine](4,4'-dinonadecyl-2,2'-bipyridine)iridium(III) chloride (2) have been prepared. Langmuir monolayers at the air-water interface of 1 and 2 with different anions in the subphase have been characterized by pi-A compression isotherms and Brewster angle microscopy (BAM). The transferred LB films have been characterized by IR, UV-vis and emission spectroscopy, and atomic force microscopy (AFM). Electroluminescent devices formed by LB films containing alternating layers of these two molecules show dual emission by simple mixing of the two emitters in a single LB film, and by preparing two stacked configurations, in which a LB layer of the ruthenium complexes is deposited on top of a LB layer of the iridium complexes and the inverse situation. The color of the electroluminescence can be tuned by changing the thickness of each LB layer. Due to efficient hole blocking of a layer of the iridium complexes when deposited on top of the layer of ruthenium complexes, in that configuration the green emission of the iridium complexes is suppressed. In the opposite case, excitons are generated in both layers although most likely preferentially in the layer of the iridium complexes.
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Affiliation(s)
- Henk J Bolink
- Instituto de Ciencia Molecular, Universidad de Valencia, 46980 Paterna, Spain.
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Clemente-León M, Coronado E, López-Muñoz A, Repetto D, Ito T, Konya T, Yamase T, Constable EC, Housecroft CE, Doyle K, Graber S. Dual-emissive photoluminescent Langmuir-Blodgett films of decatungstoeuropate and an amphiphilic iridium complex. Langmuir 2010; 26:1316-1324. [PMID: 19754063 DOI: 10.1021/la902513z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Langmuir monolayers and Langmuir-Blodgett (LB) films of the decatungstoeuropate [Eu(W(5)O(18))(2)](9-) (EuW(10)) and the amphiphilic Ir complex 1 have been successfully fabricated by using the adsorption properties of the EuW(10) polyanion dissolved in the aqueous subphase onto a positively charged 1 monolayer at the air-water interface. The compression isotherms and Brewster angle microscopy (BAM) of monolayers of 1 on pure water (1 monolayer) and on a subphase containing 10(-6) M EuW(10) and 10(-3) M NaCl (1/EuW(10) monolayer) have been studied. Infrared and UV-vis spectroscopy of the transferred LB films indicate that EuW(10) and 1 molecules are incorporated within these LB films. X-ray reflectivity (SXR) and atomic force microscopy (AFM) experiments indicate that LB films of 1 present a heterogeneous morphology while 1/EuW(10) films show a flatter and more homogeneous surface as well as a layered structure with a periodicity of 4.1 nm. Mixed monolayers of 1 and DODA (dimethyldioctadecylammonium bromide) have been prepared with EuW(10) polyanions in the subphase to control the concentration of 1 and EuW(10) polyanions within the LB films. AFM and SXR experiments with the transferred LB films show that the dilution of 1 with DODA improves the layered structure. The luminescence of 1 is partially quenched by EuW(10) in the 1/EuW(10) LB films, while emission from EuW(10) is not detected. On the other hand, emission from both entities is preserved in the LB films prepared from mixed DODA/1 monolayers, in which the red and yellow emissions arise independently from EuW(10) and 1, respectively. The different DODA:1 ratios lead to changes in the emission color. Therefore, they constitute a promising color-tunable luminescent material.
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Bolink HJ, Baranoff E, Clemente-León M, Coronado E, Lopéz-Muñoz A, Repetto D, Sessolo M, Nazeeruddin MK. Molecular ionic junction for enhanced electronic charge transfer. Langmuir 2009; 25:79-83. [PMID: 19209442 DOI: 10.1021/la803199s] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present the first evidence of charge injection improvement in an organic electroluminescent device provided by a single ionic molecular layer. A hole-dominated, hybrid organic-inorganic light-emitting device is used as a probe to verify the effectiveness of the ionic compound monolayer on modifying the metal oxide cathode. The rearrangement of ions under an applied bias induces a strong field at the electrode-organic interface resulting in an enhancement of the electron injection into the organic semiconductor. A strong decrease in turn-on voltage for electroluminescence is observed for the device containing the ionic molecular monolayer.
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Affiliation(s)
- Henk J Bolink
- Instituto de Ciencia Molecular, and Fundació General de la UniVersidad de Valencia (FGUV),UniVersidad de Valencia, P.O. Box 22085, E-46071 Valencia, Spain.
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Graber S, Doyle K, Neuburger M, Housecroft CE, Constable EC, Costa RD, Ortí E, Repetto D, Bolink HJ. A supramolecularly-caged ionic iridium(III) complex yielding bright and very stable solid-state light-emitting electrochemical cells. J Am Chem Soc 2008; 130:14944-5. [PMID: 18937473 DOI: 10.1021/ja805900e] [Citation(s) in RCA: 133] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new iridium(III) complex showing intramolecular interligand pi-stacking has been synthesized and used to improve the stability of single-component, solid-state light-emitting electrochemical cell (LEC) devices. The pi-stacking results in the formation of a very stable supramolecularly caged complex. LECs using this complex show extraordinary stabilities (estimated lifetime of 600 h) and luminance values (average luminance of 230 cd m-2) indicating the path toward stable ionic complexes for use in LECs reaching stabilities required for practical applications.
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Affiliation(s)
- Stefan Graber
- Department of Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland
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Ancarani F, Angeli E, Antinori A, Antonucci G, Bonasso M, Bruno R, Capobianchi MR, Cargnel A, Cozzi-Lepri A, Monforte AD, Cingolani A, Galli M, Orofino GC, Girardi E, Marino N, Bongiovanni M, Morsica G, Narciso P, Pastecchia C, Pizzaferri P, Puoti M, Santantonio T, Verucchi G, Montroni M, Scalise G, Braschi MC, Maracci M, Tirelli U, Cinelli R, Pastore G, Ladisa N, Minafra G, Suter F, Arici C, Chiodo F, Colangeli V, Fiorini C, Coronado O, Carosi G, Cadeo GP, Torti C, Minardi C, Bertelli D, Rizzardini G, Migliorino G, Manconi PE, Piano P, Ferraro T, Scerbo A, Pizzigallo E, D'Alessandro M, Santoro D, Pusterla L, Carnevale G, Galloni D, Viganò P, Mena M, Ghinelli F, Sighinolfi L, Leoncini F, Mazzotta F, Pozzi M, Caputo SL, Angarano G, Grisorio B, Saracino A, Ferrara S, Grima P, Tundo P, Pagano G, Cassola G, Alessandrini A, Piscopo R, Toti M, Chigiotti S, Soscia F, Tacconi L, Orani A, Perini P, Scasso A, Vincenti A, Chiodera F, Castelli P, Scalzini A, Fibbia G, Moroni M, Lazzarin A, Cargnel A, Vigevani GM, Caggese L, Monforte AD, Repetto D, Novati R, Galli A, Merli S, Pastecchia C, Moioli MC, Esposito R, Mussini C, Abrescia N, Chirianni A, Izzo CM, Piazza M, De Marco M, Viglietti R, Manzillo E, Graf M, Colomba A, Abbadessa V, Prestileo T, Mancuso S, Ferrari C, Pizzaferri P, Filice G, Minoli L, Bruno R, Novati S, Baldelli F, Tinca M, Petrelli E, Cioppi A, Alberici F, Ruggieri A, Menichetti F, Martinelli C, De Stefano C, La Gala A, Ballardini G, Briganti E, Magnani G, Ursitti MA, Arlotti M, Ortolani P, Cauda R, Dianzani F, Ippolito G, Antinori A, Antonucci G, D'Elia S, Narciso P, Petrosillo N, Vullo V, De Luca A, Di Giambenedetti S, Zaccarelli M, Acinapura R, De Longis P, Ciardi M, D'Offizi G, Trotta MP, Noto P, Lichtner M, Capobianchi MR, Girardi E, Pezzotti P, Rezza G, Mura MS, Mannazzu M, Resta F, Loso K, Caramello P, Sinicco A, Soranzo ML, Orofino G, Sciandra M, Bonasso M, Grossi PA, Basilico C, Poggio A, Bottari G, Raise E, Pasquinucci S, De Lalla F, Tositti G, Lepri AC, Solmone M, Girardi E, Lalle E, Abbate I, Monforte AD, Cozzi-Lepri A, Alessandrini A, Piscopo R, Ebo F, Cosco L, Antonucci G, Ippolito G, Capobianchi MR. Evolution of HVR-1 Quasispecies after 1-Year Treatment in HIV/HCV-Coinfected Patients According to the Pattern of Response to Highly Active Antiretroviral Therapy. Antivir Ther 2006. [DOI: 10.1177/135965350601100102] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Hepatitis C virus (HCV) variability is mainly attributed to the ability of the virus to respond to host immune pressure, acting as a driving force for the evolution of quasispecies. This study was aimed at studying the changes in HVR-1 heterogeneity and the evolution of HCV quasispecies in HIV/HCV-coinfected patients according to the pattern of response to highly active antiretroviral therapy (HAART). Sixteen HIV/HCV-coinfected patients harbouring HCV genotype 1 and who had been on HAART for at least 1 year, 8 showing increasing CD4+T-cell counts (immunological responders) and 8 showing a stable or decreasing CD4+ T-cell counts (immunological non-responders), were selected from a prospective cohort study. After 1 year of HAART, 11 patients showed HIV viral load <2.6 log10 cp/ml (virological responders), and 5 showed HIV viral load above this value (virological non-responders). Plasma samples, collected before starting therapy and after 1 year of HAART, underwent clonal sequence analysis for HVR-1 region of HCV. Non-synonymous/synonymous substitutions ratio (Ka/Ks), aminoacidic complexity (normalized Shannon entropy) and diversity (p-distance), were considered as parameters of quasispecies heterogeneity. After 1 year of HAART, heterogeneity of HVR-1 quasispecies significantly decreased in virological non-responders, whereas the heterogeneity tended to increase in virological responders. The differences in the evolution were less stringent, when considering immunological response. On the other hand, profound qualitative modifications of HVR-1 quasispecies were observed only in patients with both immunological and virological HAART response. On the whole, these findings suggest that, in patients undergoing HAART, the extent of HCV variability and the evolution of HVR-1 quasispecies is influenced by the pattern of response to antiretroviral therapy.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Enrico Girardi
- National Institute of Infectious Diseases “L. Spallanzani”, Rome
| | - Eleonora Lalle
- National Institute of Infectious Diseases “L. Spallanzani”, Rome
| | - Isabella Abbate
- National Institute of Infectious Diseases “L. Spallanzani”, Rome
| | | | - Alessandro Cozzi-Lepri
- Department of Primary Care and Population Sciences, Royal Free and University College Medical School, London
| | | | - Rita Piscopo
- Department of Infectious Diseases, Galliera Hospital, Genova
| | - Francesca Ebo
- Department of Infectious Diseases, Hosp Civile San Giovanni e Paolo, Venezia
| | - Lucio Cosco
- Department of Infectious Diseases, A. Pugliesi Catanzaro
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14
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Antonucci G, Girardi E, Cozzi-Lepri A, Capobianchi MR, Morsica G, Pizzaferri P, Ladisa N, Sighinolfi L, Chiodera A, Solmone M, Lalle E, Ippolito G, Monforte AD, Ancarani F, Antinori A, Antonucci G, Bonasso M, Bruno R, Capobianchi MR, Cargnel A, Cozzi-Lepri A, d'Arminio Monforte A, Luca AD, Galli M, Gennero L, Girardi E, Lipani F, Marino N, Milazzo L, Morsica G, Narciso P, Pizzaferri P, Puoti M, Santantonio T, Verucchi G, Montroni M, Scalise G, Braschi MC, Prete MSD, Tirelli U, Cinelli R, Pastore G, Ladisa N, Suter GMBF, Arici C, Chiodo F, Colangeli V, Fiorini C, Coronado O, Carosi G, Cadeo GP, Torti C, Minardi C, Bertelli D, Rizzardini G, Migliorino G, Manconi PE, Piano P, Ferraro T, Scerbo A, Pizzigallo E, D'Alessandro M, Santoro D, Pusterla L, Carnevale G, Galloni D, Viganò P, Mena M, Ghinelli F, Sighinolfi L, Leoncini F, Mazzotta F, Pozzi M, Caputo SL, Angarano G, Grisorio B, Saracino A, Ferrara S, Grima P, Tundo P, Pagano G, Cassola G, Alessandrini A, Piscopo R, Toti M, Chigiotti S, Soscia F, Tacconi L, Orani A, Perini P, Scasso A, Vincenti A, Chiodera F, Castelli P, Scalzini A, Fibbia G, Moroni M, Lazzarin A, Cargnel A, Vigevani GM, Caggese L, Monforte AD, Repetto D, Novati R, Galli A, Merli S, Pastecchia C, Moioli MC, Esposito R, Mussini C, Abrescia N, Chirianni A, Izzo CM, Piazza M, Marco MD, Viglietti R, Manzillo E, Graf M, Colomba A, Abbadessa V, Prestileo T, Mancuso S, Ferrari C, Pizzaferri P, Filice G, Minoli L, Bruno R, Novati S, Baldelli F, Tinca M, Petrelli E, Cioppi A, Alberici F, Ruggieri A, Menichetti F, Martinelli C, Stefano CD, Gala AL, Ballardini G, Briganti E, Magnani G, Ursitti MA, Arlotti M, Ortolani P, Cauda R, Dianzani F, Ippolito G, Antinori A, Antonucci G, D'Elia S, Narciso P, Petrosillo N, Vullo V, Luca AD, Giambenedetti SD, Zaccarelli M, Acinapura R, Longis PD, Ciardi M, D'Offizi G, Trotta MP, Noto P, Lichtner M, Capobianchi MR, Girardi E, Pezzotti P, Rezza G, Mura MS, Mannazzu M, Resta F, Loso K, Caramello P, Sinicco A, Soranzo ML, Orofino G, Sciandra M, Bonasso M, Grossi PA, Basilico C, Poggio A, Bottari G, Raise E, Pasquinucci S, Lalla FD, Tositti G, Lepri AC. Response to Haart and Gb Virus Type C Coinfection in a Cohort of Antiretroviral-Naive HIV-Infected Individuals. Antivir Ther 2005. [DOI: 10.1177/135965350501000108] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The prognostic role of GB virus type C (GBV-C) viraemia in HIV-infected subjects treated with highly active antiretroviral therapy (HAART) is still undefined, The aim of this analysis is to assess the relationship between GBV-C infection and response to antiretroviral therapy among HIV-infected subjects initiating HAART when antiretroviral-naive. A prospective, observational study of 400 HIV-infected patients with measurements of GBV-C RNA, hepatitis C virus (HCV) antibodies and HCV RNA determined from plasma stored prior to HAART initiation, Time to virological (achieving HIV RNA ≤500 copies/ml) and immunological success (a CD4+ count increase of ≥200cells/μl), and the time to virological relapse (confirmed HIV RNA >500 copies/ml) were assessed by Kaplan-Meier methods and Cox proportional hazard regression model. Of the subjects, 117 (29.3%) were GBV-C positive and, overall, 351 (87.8%) patients achieved virological success, After controlling for a number of confounders including HCV RNA, GBV-C viraemic patients experienced a significantly lower risk of HIV rebound than those who were GBV-C negative [relative hazard (RH)=0.56, 95% CI: 0.34–0.93, P=0.03], Conversely, the probability of achieving initial virological success or CD4+ count response after HAART did not differ between GBV-C-negative and -positive subjects, These results suggest that GBV-C coinfection may play a role in determining the rate of HIV rebound possibly by competing with HIV replication after HIV load has been successfully suppressed by HAART.
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Affiliation(s)
| | - Giorgio Antonucci
- National Institute of Infectious Diseases, L Spallanzani, Roma, Italy
| | - Enrico Girardi
- National Institute of Infectious Diseases, L Spallanzani, Roma, Italy
| | - Alessandro Cozzi-Lepri
- Department of Primary Care and Population Sciences, Royal Free and University College Medical School, London, UK
| | | | - Giulia Morsica
- Institute of Infectious Diseases, Ateneo Vita e Salute, S Raffaele Hospital, Milano, Italy
| | - Paolo Pizzaferri
- Department of Infectious Diseases and Hepatology, Azienda Ospedaliera, Parma, Italy
| | - Nicoletta Ladisa
- Institute of Infectious and Tropical Diseases, University of Bari, Bari, Italy
| | - Laura Sighinolfi
- Department of Infectious Diseases, Arcispedale S Anna, Ferrara, Italy
| | | | | | - Eleonora Lalle
- National Institute of Infectious Diseases, L Spallanzani, Roma, Italy
| | - Giuseppe Ippolito
- National Institute of Infectious Diseases, L Spallanzani, Roma, Italy
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15
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Luca AD, Cozzi-Lepri A, Perno CF, Balotta C, Giambenedetto SD, Poggio A, Pagano G, Tositti G, Piscopo R, Forno AD, Chiodo F, Magnani G, Monforte AD, Angarano G, Antinori A, Balotta C, Cozzi-Lepri A, Monforte AD, De Luca A, Monno L, Perno CF, Rusconi S, Montroni M, Scalise G, Zoli A, Del Prete MS, Tirelli U, Di Gennaro G, Pastore G, Ladisa N, Minafra G, Suter F, Arici C, Chiodo F, Colangeli V, Fiorini C, Coronado O, Carosi G, Cadeo GP, Castelli F, Minardi C, Vangi D, Rizzardini G, Migliorino G, Manconi PE, Piano P, Ferraro T, Scerbo A, Pizzigallo E, D'Alessandro M, Santoro D, Pusterla L, Carnevale G, Galloni D, Viganò P, Mena M, Ghinelli F, Sighinolfi L, Leoncini F, Mazzotta F, Pozzi M, Caputo SL, Angarano G, Grisorio B, Ferrara S, Grima P, Tundo P, Pagano G, Piersantelli N, Alessandrini A, Piscopo R, Toti M, Chigiotti S, Soscia F, Tacconi L, Orani A, Perini P, Scasso A, Vincenti A, Chiodera F, Castelli P, Scalzini A, Fibbia G, Moroni M, Lazzarin A, Cargnel A, Vigevani GM, Caggese L, d'Arminio Monforte A, Repetto D, Novati R, Galli A, Merli S, Pastecchia C, Moioli MC, Esposito R, Mussini C, Abrescia N, Chirianni A, Izzo C, Piazza M, De Marco M, Montesarchio V, Manzillo E, Graf M, Colomba A, Abbadessa V, Prestileo T, Mancuso S, Ferrari C, Pizzaferri P, Filice G, Minoli L, Bruno R, Novati S, Balzelli F, Loso K, Petrelli E, Cioppi A, Alberici F, Ruggieri A, Menichetti F, Martinelli C, De Stefano C, Gala AL, Ballardini G, Briganti E, Magnani G, Ursitti MA, Arlotti M, Ortolani P, Cauda R, Dianzani F, Ippolito G, Antinori A, Antonucci G, D'Elia S, Narciso P, Petrosillo N, Vullo V, De Luca A, Di Giambenedetto S, Zaccarelli M, Acinapura R, De Longis P, Ciardi M, D'Offizi G, Trotta MP, Noto P, Lichtner M, Capobianchi MR, Girardi E, Pezzotti P, Rezza G, Mura MS, Mannazzu M, Caramello P, Sinicco A, Soranzo ML, Gennero L, Sciandra M, Bonasso M, Grossi PA, Basilico C, Poggio A, Bottari G, Raise E, Pasquinucci S, De Lalla F, Tositti G, Resta F, Chimienti A, Lepri AC. Variability in the Interpretation of Transmitted Genotypic HIV-1 Drug Resistance and Prediction of Virological Outcomes of the Initial Haart by Distinct Systems. Antivir Ther 2004. [DOI: 10.1177/135965350400900505] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
High level HIV-1 drug resistance in recently infected treatment-naive individuals correlates with sub-optimal virological responses to highly active antiretroviral therapy (HAART). To determine whether genotypic HIV-1 drug resistance in chronic naive patients, as interpreted by various systems, could predict the virological outcomes of HAART, isolates from patients enrolled in a prospective observational cohort (ICoNA) prior to treatment start were genotyped. Genotypic susceptibility scores (GSS) assigned to the initial HAART regimens using the interpretations of pre-therapy resistance mutations by 13 systems were related to virological outcomes. Of 415 patients, 42 (10%) had at least one major resistance mutation. According to the different interpretations, 1.9–20.5% of patients had some level of resistance to at least one drug in the initial regimen. In multivariable analysis, GSS from two systems significantly predicted the time to virological success: Rega 5.5, for each unit increase in GSS adjusted relative hazard (RH) 1.86 [95% confidence intervals (95% CI): 1.15–3.02] and hivresistanceWeb v3, RH 1.87 (95% CI: 1.00–3.48). With three other systems, GSS showed a trend towards a significant prediction of success: Retrogram 1.6, RH 2.33 (95% CI: 0.98–5.53), Menéndez 2002, RH 2.36 (95% CI: 0.97–5.72) and Stanford hivdb, RH 2.06 (95% CI: 0.94–4.49). Genotypic resistance testing coupled with adequate interpretation in chronic naive patients can usefully identify those at risk of sub-optimal virological response to HAART.
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Affiliation(s)
| | - Andrea De Luca
- Institute of Clinical Infectious Diseases, Catholic University, Rome, Italy
| | - Alessandro Cozzi-Lepri
- Royal Free Centre for HIV Medicine and Department of Primary Care and Population Sciences, Royal Free and University College Medical School, London, UK
| | | | - Claudia Balotta
- Institute of Infectious Diseases and Tropical Medicine, University of Milan, Milan, Italy
| | | | - Antonio Poggio
- Department of Infectious Diseases, Civile Hospital, Verbania, Italy
| | - Gabriella Pagano
- Department of Infectious Diseases, S Martino Hospital, Genova, Italy
| | - Giulia Tositti
- Department of Infectious Diseases, Vicenza Hospital, Vicenza, Italy
| | - Rita Piscopo
- Department of Infectious Diseases, Galliera Hospital, Genova, Italy
| | - Antonio Del Forno
- Institute of Clinical Infectious Diseases, Catholic University, Rome, Italy
| | - Francesco Chiodo
- Institute of Infectious Diseases, University of Bologna, Bologna, Italy
| | - Giacomo Magnani
- Department of Infectious Diseases, Santa Maria Nuova Hospital, Reggio Emilia, Italy
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16
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Puoti M, Cozzi-Lepri A, Ancarani F, Bruno R, Ambu S, Ferraro T, Tundo P, Santantonio T, Toti M, Bonasso M, Monforte AD, Ancarani F, Antonucci G, Bonasso M, Bruno R, Cozzi-Lepri A, Monforte AD, Luca AD, Galli M, Gennero L, Girardi E, Lipani F, Marino N, Milazzo L, Morsica G, Narciso P, Pizzaferri P, Puoti M, Santantonio T, Verucchi G, Montroni M, Scalise G, Zoli A, Prete MSD, Tirelli U, Di Gennaro G, Pastore G, Ladisa N, Minafra G, Suter F, Arici C, Chiodo F, Colangeli V, Fiorini C, Coronado O, Carosi G, Cadeo GP, Castelli F, Minardi C, Vangi D, Rizzardini G, Migliorino G, Manconi PE, Piano P, Ferraro T, Scerbo A, Pizzigallo E, D'Alessandro M, Santoro D, Pusterla L, Carnevale G, Galloni D, Viganò P, Mena M, Ghinelli F, Sighinolfi L, Leoncini F, Mazzotta F, Pozzi M, Lo Caputo S, Angarano G, Grisorio B, Ferrara S, Grima P, Tundo P, Pagano G, Piersantelli N, Alessandrini A, Piscopo R, Toti M, Chigiotti S, Soscia F, Tacconi L, Orani A, Perini P, Scasso A, Vincenti A, Chiodera F, Castelli P, Scalzini A, Fibbia G, Moroni M, Lazzarin A, Cargnel A, Vigevani GM, Caggese L, d'Arminio Monforte A, Repetto D, Novati R, Galli A, Merli S, Pastecchia C, Moioli MC, Esposito R, Mussini C, Abrescia N, Chirianni A, Izzo C, Piazza M, De Marco M, Montesarchio V, Manzillo E, Graf M, Colomba A, Abbadessa V, Prestileo T, Mancuso S, Ferrari C, Pizzaferri P, Filice G, Minoli L, Bruno R, Novati S, Balzelli F, Loso K, Petrelli E, Cioppi A, Alberici F, Ruggieri A, Menichetti F, Martinelli C, De Stefano C, La Gala A, Ballardini G, Briganti E, Magnani G, Ursitti MA, Arlotti M, Ortolani P, Ortona L, Dianzani F, Ippolito G, Antinori A, Antonucci G, D'Elia S, Narciso P, Petrosillo N, Vullo V, De Luca A, Del Forno L, Zaccarelli M, Acinapura R, De Longis P, Ciardi M, D'Offizi G, Trotta MP, Noto P, Lichtner M, Capobianchi MR, Girardi E, Pezzotti P, Rezza G, Mura MS, Mannazzu M, Caramello P, Sinicco A, Soranzo ML, Gennero L, Sciandra M, Bonasso M, Grossi PA, Basilico C, Poggio A, Bottari G, Raise E, Pasquinucci S, De Lalla F, Tositti G, Resta F, Chimienti A, Cozzi-Lepri A. The Management of Hepatitis B Virus/HIV-1 Co-Infected Patients Starting Their First Haart Regimen. Treating Two Infections for the Price of One Drug? Antivir Ther 2004. [DOI: 10.1177/135965350400900506] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We examined the impact of a lamivudine-containing highly active antiretroviral therapy (HAART) regimen on 164 hepatitis B virus/HIV co-infected individuals starting their first HAART. Lamivudine-treated patients (accounting for 73% of the study population) showed a significantly lower level of alanine aminotransferase over follow-up [–81.1 mU/ml mean difference; 95% confidence intervals (95% CI): –30.3; –131.7, P=0.003] and a significantly reduced risk of liver-related morbidity/mortality [Relative hazard (RH)=0.07; 95% CI: 0.01–0.38, P=0.002] than those starting a lamivudine sparing-regimen.
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Affiliation(s)
| | - Massimo Puoti
- Institute of Infectious and Tropical Diseases, Spedali Civili, University of Brescia, Brescia, Italy
| | - Alessandro Cozzi-Lepri
- Department of Primary Care and Population Sciences, Royal Free and University College Medical School, London, UK
| | - Fausto Ancarani
- Institute of Infectious Diseases and Public Health, Umberto I Hospital, University of Ancona, Ancona, Italy
| | - Raffaele Bruno
- Institute of Infectious and Tropical Diseases, IRCCS S Matteo, University of Pavia, Pavia, Italy
| | - Silvia Ambu
- Department of Infectious Diseases, Azienda Ospedaliera Careggi, Firenze, Italy
| | - Teresa Ferraro
- Department of Infectious Diseases, Ospedale A Puglise, Catanzaro, Italy
| | - Paolo Tundo
- Department of Infectious Diseases, Ospedale Santa Caterina Novella, Galatina (Lecce), Italy
| | | | - Mario Toti
- Department of Infectious Diseases, Ospedale di Grosseto, Grosseto, Italy
| | - Marino Bonasso
- Department of Infectious Diseases, Ospedale ‘Amedeo Savoia’, Torino, Italy
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Enders A, Peterka D, Repetto D, Lin N, Dmitriev A, Kern K. Temperature dependence of the surface anisotropy of Fe ultrathin films on Cu(001). Phys Rev Lett 2003; 90:217203. [PMID: 12786584 DOI: 10.1103/physrevlett.90.217203] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2002] [Indexed: 05/24/2023]
Abstract
We report an experimental approach to separate temperature dependent reversible and irreversible contributions to the perpendicular magnetic anisotropy of Fe films grown at low temperatures on Cu(001) substrates. The surface anisotropy K(S)(T) is found to decrease linearly with temperature, causing a thermally induced spin reorientation into the plane. The irreversible shift of the spin reorientation transition and the coercivity of the iron films are directly correlated to the increasing Fe island size during annealing. The increased coercivity is discussed in terms of domain wall energy inhomogeneities provided by the islands.
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Affiliation(s)
- A Enders
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
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