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HVOF-sprayed HAp/S53P4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants

Journal of Magnesium and Alloys 2024年第1期12卷 345-360页

作者： Carlos A.Poblano-Salas John Henao Astrid L.Giraldo-Betancur Paola Forero-Sossa Diego German Espinosa-Arbelaez Jorge A.González-Sánchez Luis R.Dzib-Pérez Susana T.Estrada-Moo Idelfonso E.Pech-Pech CIATEQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-CIATEQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-cinvestav Libramiento Norponiente#2000.Fraccionamiento Real de JuriquillaQuerétaro 76230Mexico Universidad Tecnológica de querétaro Av.Pie de la Cuesta N°2501Querétaro 76148Mexico CIDESI Av.Playa Pie de la Cuesta No 702Col.San PabloQuerétaro 76125Mexico Center for Corrosion Research Autonomous University of CampecheAv.Héroe de Nacozari No.480P.C.24070San Francisco de CampecheCam.Mexico

Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro *** the present work,75%***-25%wt.S53P4 bioactive glass powders were HVOF-sprayed to obtain HAp/S53P4 BG composite coatings on a bioresorbable AZ31 *** study is focused on exploring the effect of the stand-off distance and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those *** characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite *** results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal *** was also found that both spraying distance and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the *** addition,in-vitro electrochemical studies were performed on the obtained HAp/S53P4 BG composite coatings and compared against the uncoated AZ31 *** results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(SBF).

关键词： Coatings Composites Thermal spray Temporary implants Hydrogen evolution

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Energy spectrum of an electron confined in the hexagon-shaped quantum well

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Science China(Technological Sciences) 2009年第1期52卷 15-18页

作者： Yu.V.VOROBIEV V.R.VIEIRA P.P.HORLEY P.N.GORLEY J.GONZALEZ-HERNANDEZ cinvestav unidad querétaro Libramiento Norponiente#2000 Centro de Física das Interaccoes Fundamentais Av.Rovisco Pais Yuri Fedkovych Chernivtsi National University 2 Kotsyubynsky str. CIMAV 120 Miguel de Cervantes

Considering the hexagonal-shaped quantum-scale formations on the surface of thin semiconductor films, a methodology was developed to obtain the analytical solution of the Schrdinger equation when impenetrable walls of a quantum well are treated as mirrors. The results obtained allowed the calculation of the space probability distributions and the energy spectrum of the particle confined in a hex-agonal-shaped well.

关键词： quantum well Schrodinger equation wave function hexagon reflection boundary conditions impenetrable walls

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Photoluminescence characteristics of soft PZT 53/47 ceramic doped at A and/or B sites

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Journal of Advanced Ceramics 2018年第2期7卷 109-116页

作者： M.D.DURRUTHY-RODRíGUEZ J.J.GERVACIO-ARCINIEGA M.HERNáNDEZ-GARCíA J.M.YánEZ-LIMóN Universidad Nacional Evangélica Departamento de Física Aplicada Instituto de CibernéticaMatemáticay FísicaCITMA Catedrático CONACYT-Facultad de Ciencias Físico Matemáticas Benemérita Universidad Autónoma de Puebla cinvestav-unidad querétaro del IPN Libramiento Norponiente 2000Fracc.Real de Juriquilla

This study presents the photoluminescence characteristics of the PZT 53/47 system doped at A and/or B sites, with Nb(PZTN), La(PLZT), and Nb–La(PLZTN) in the concentration range from 0.2 to 1.0 molar fraction. The intensity of the emission bands of the system PZTN is two orders higher than the intensity of the emission bands of the systems PLZT and PLZTN, and these emission bands are located at 1.73 eV(718 nm), 2.56 eV(485 nm), and 2.93 eV(424 nm). The origin of the luminescence in these systems is associated with lead and oxygen vacancies produced during the sintering process. The results from X-ray diffraction(XRD) show a mixture of rhombohedral and tetragonal phases. The system PZTN shows a higher tetragonal phase concentration, while PLZT and PLZTN systems show a higher rhombohedral phase concentration. The cell volume shows an increase with dopant concentration only in the case of the PLZTN system. The band gap energy shows a small variation in the PZTN and PLZTN cases around 3.0 eV, a close value to the band gap energy of the pure PZT 53/47 sample. The system PLZT shows an increasing behavior until 4.41 eV for the higher dopant concentration.

关键词： photoluminescence PZT ceramics band structure X-ray diffraction(XRD)

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Equivalent circuit for the characterization of the resonance mode in piezoelectric systems

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Journal of Advanced Dielectrics 2015年第4期5卷 37-41页

作者： Y.Fernández-Afonso O.García-Zaldívar F.Calderón-Piñar Centrode Estudios Avanzadosde Cuba Kilómetro 1y 1/2 Carreter a San Antonio de los Baños Valle Grande La LisaHabanaCuba Facultadde Física-Instituto de Cienciay Tecnología de Materiales Universidad de La Habana.San LázaroyL Vedado.La Habana 10400 Cuba cinvestav-unidad querétaro libramiento norponiente no.2000 Realde Juriquilla QuerétaroQro.76230México

The impedance properties in polarized piezoelectric can be described by electric equivalent *** classic circuit used in the literature to describe real systems is formed by one resistor(R),one inductance(L)and one capacitance C connected in series and one capacity(C_(0))connected in parallel with the ***,the equation that describe the resonance and anti-resonance frequencies depends on a complex manner of R,L,C and C_(0).In this work is proposed a simpler model formed by one inductance(L)and one capacity(C)in series;one capacity(C_(0))in parallel;one resistor(R_(p))in parallel and one resistor(Rs)in series with other *** the traditional circuit,the equivalent circuit elements in the proposed model can be simply determined by knowing the experimental values of the resonance frequency fr,anti-resonance frequency fa,impedance module at resonance frequency|Z|,impedance module at anti-resonance frequency|Za|and low frequency capacitance C_(0),without ftting the im-pedance experimental data to the obtained equation.

关键词： Piezoelectric equivalent circuit electromechanic

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BiFeO_(3) codoping with Ba,La and Ti:Magnetic and structural studies

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Journal of Advanced Dielectrics 2015年第4期5卷 53-60页

作者： O.García-Zaldívar S.Díaz-Castañón F.J.Espinoza-Beltran M.A.Hernández-Landaverde G.López J.Faloh-Gandarilla F.Calderón-Piñar Facultad de Física-Instituto de Ciencia y Tecnología de Materiales Universidad de La Habana San Láazaro y L VedadoLa Habana 10400Cuba cinvestav-unidad querétaro Libramiento Norponiente No.2000 Real de JuriquillaQuerétaroQro.76230México Instituto Latino-Americanode Ciênciasda Vidaeda Natureza Universidade Federalda Integração Latino-Americana (ILCVN-UNILA)Avenida Tancredo NevesPTIBloco 6 CEP:85866-000-Foz do Iguaçu-ParanaBrazil División Materiales Avanzados Instituto Potosinode Investigación Científica Tecnológica San Luis Potosí CP78216Méexico

Conventional solid state reaction method,from oxides and carbonates,was employed to prepare bismuth(Bi)-based multiferroic *** undoped BiFeO_(3)(BFO)and the codoped system with Ba,La and Ti(Bi_(1-x)Ba_(x)Fe_(1-y)Ti_(y)O_(3),Bi_(1-x-z)Ba_(x)LazFe_(1-y)TiyO_(3))with x,y,z=0.1 were prepared stoichiometrically and sintered at two different *** structural and magnetic properties were investigated at room *** measurements confirm the obtaining of the rhombohedral perovskite structure of the BFO family *** the undoped system,some reflections of undesired phases are present for two different sintering temperatures,while for the doped system only one phase is present for both *** magnetic characterization at room temperature revealed remarkable differences between the ceramic *** results show that for undoped BFO system,spontaneous magnetization is not observed at room ***,in doped one,a well-defined ferromagnetic behavior is observed at room temperature,possible,due to the suppression of the spatially modulated spin structure of BFO promoted by the reduction of the rhombohedral distortion and the weakening of the Bi-O *** XPS results confirm the presence of oxygen vacancies and the coexistence of Fe^(3+)and Fe^(2+) in all the studied *** measurements reveal that the dopant incorporation has not a direct effect in Neel temperature but possibly yes in ferroelectric-paraelectric transition.

关键词： Multiferroics XPS magnetic bismuth ferrite BiFeO_(3)

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HG3IN2TE6- A NEW MATERIAL FOR DETECTORS FOR 1.3-1.55 μM SPECTRAL RANGE

HG3IN2TE6- A NEW MATERIAL FOR DETECTORS FOR 1.3-1.55 μM SPE...

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第8届国际材联电子材料国际研讨会

作者： Peter N. Gorley Olena G. Grushka Zinaida M. Grushka Alexander I. Malik Yuri V.Vorobiev Jesus González-Hernández Paul P. Horley Chemivtsi National University Department of Physical Electronics 2 Kotsyubynsky str. 58012 Chernivtsi Ukraine INAOE Electronics Department Apdo.51 Puebla Pue. 72000 Mexico cinvestav-querétaro libramiento norponiente 2000 Fracc. Real de Juriquilla 76230 Querétaro México Chernivtsi National University Department of Physical Electronics 2 Kotsyubynsky str. 58012 Chernivtsi Ukraine CINVESTAV-Querétaro Libramiento Norponiente 2000 Fracc. Real de Juriquilla 76230 Querétaro México

Modern fiber optics for the spectral ranges of 1.33-1.55μm makes use of Ge photodiodes and AB compound-based ones as detectors. The disadvantage of the first material mentioned is low quantum yield;the second one is expensive and still has difficulties to obtain big samples with the necessary photoelectric *** propose to use HgInTe compound (MIT) for optimized high-quality detectors for the given spectral ranges. This compound is cheap and has interesting physical properties. The congruent character of

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Sintering Kinetics of Soft-Doped PZT(54/46)Systems

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Journal of Modern Physics 2011年第5期2卷 416-420页

作者： M.D.Durruthy-Rodriguez F.Calderon-Pinar C.Malfatti L.D.Perez-Fernandez Applied Physics Department CyberneticMathematic and Physics InstituteVedadoHavana CityHavanaCuba cinvestav-unidad queretaro IPNLibramiento Norponiente No.2000Fracc.Real de JuriquillaQuerétaroQuerétaroMéxico Magnetism Laboratory Science and Materials Technology InstitutesHavana UniversitySan Lázaro y LVedadoHavana CityCuba Metalurgy Deparment Engeneering SchoolRio Grande do Sul Federal UniversityPorto AlegreRS-Brasil Applied Physics Department CyberneticMathematic and Physics Institute VedadoHavana CityHavanaCuba

The influence of dopant concentration on PZT (54/46) systems doped with lanthanum and/or niobium is studied. The sintering kinetics is presented for 1 wt% of the dopant used to find the main mechanism which drives this process. The results were compared with a phenomenological model for viscous sintering and solid state sintering. The exponent obtained for viscous sintering in PZTN, PLZT and PLZTN were 0.05, 0.01, and 0.23 respectively, which indicate that the process is reactive liquid in all cases. In the other hand, the exponent obtained for solid state sintering were 6.61, 5.68, and 1.23 respectively, and prevalence Ost-wald ripening and coalescence process together. Both dopants inhibit the grain growth and accelerate the sintering process, which increases with dopant concentration and the combination of both dopants. Shoro-hod-Olevsky model was applied for explain grain growth evolution, but does not coincide strictly with the applied model, which suggest that the process is very complex.

关键词： Sintering Kinetics Porosity Dopant Concentration

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Energy spectrum of an electron confined in the hexagon-shaped quantum well

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中国科学:技术科学 2010年第4期40卷 428-428页

作者： Yu.V.VOROBIEV V.R.VIEIRA P.P.HORLEY P.N.GORLEY J.GONZáLEZ-HERNáNDEZ cinvestav unidad querétaro Libramiento Norponiente 2. Centro de Física das Interaces FundamentaisAv.Rovisco Pais Yuri Fedkovych Chernivtsi National University CIMAV 120 Miguel de Cervantes

Considering the hexagonal-shaped quantum-scale formations on the surface of thin semiconductor films,a methodology was developed to obtain the analytical solution of the Schrdinger equation when impenetrable walls of a quantum well are treated as *** results obtained allowed the calculation of the space probability distributions and the energy spectrum of the particle confined in a hexagonal-shaped well.

关键词： quantum well Schrdinger equation wave function hexagon reflection boundary conditions impenetrable walls

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Strong emissions of blue-yellow-red regions of La and Ti modified KNaNbO_(3) ferroelectric ceramics

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Journal of Advanced Ceramics 2015年第3期4卷 183-189页

作者： M.D.DURRUTHY-RODRIGUEZ M.HERNANDEZ-GARCIA J.PORTELLES J.FUENTES M.A.HERNANDEZ-LANDAVERDE M.RAMIREZ CARDONA J.M.YANEZ-LIMON Departamento de Fisica Aplicada Instituto de CiberneticaMatematica y FisicaCITMA15#551VedadoLa HabanaCP 10400Cuba Facultad de Fisica Universidad de La HabanaSan Lazaro y LVedadoLa HabanaCP 10400Cuba cinvestav-unidad queretaro IPNLibramiento Norponiente 2000Fracc.Real de JuriquillaCP 76230QueretaroMexico Centro de Investigaciones en Ciencias de la Tierra y Materiales Universidad Autonoma del Estado de HidalgoMexico

In this work,the results of the study on the optical properties of the perovskite structure ABO3 with La^(3+) substitution for ions K^(+) and Na^(+) in the A site and Ti^(4+) substitution for ion Nb^(5+) in the B site are *** ceramics were sintered at 1100℃ and 1190℃ and formed at 10 MPa and 80 *** ceramics were obtained with 94% of the theoretical *** piezoresponse force microscopy(PFM)showed needle-shaped grains with a size of 30 nm for the samples formed at 10 MPa at both sintering ***,the high temperature and high pressure used in formation reduced the energy of the band gap(Eg)from 3.36 to 3.09 *** emissions to 2.19,1.86,2.5,and 2.31 eV were obtained by exciting the samples at 325,373,457,and 500 nm,respectively;these emissions corresponded to blue-yellow-red regions of the visible spectrum.

关键词： emission spectra condense matter ferroelectric materials band structure X-ray diffraction(XRD)

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Development of a Construction Material for Indoor and Outdoor, Metakaolinite-Based Geopolymer, with Environmental Properties

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材料科学与工程（中英文A版） 2019年第4期9卷 131-142页

作者： M.Mondragón-Figueroa Héctor.R.Guzmán-Carrillo MiguelÁngel Rico JoséLuis.Reyez-Araiza Jorge.Pineda-Piñón Edgar J.López-Naranjo María C.Columba-Palomares Jóse.M.López-Romero Josè.Ramón Gasca-Tirado Alejandro.Manzano-Ramírez cinvestav-querétaro Libramiento Norponiente#2000Fraccionamiento Real de JuriquillaQuerétaro 76230Qro.México Facultad de Química Universidad Autónoma de Querétaro centro de estudios Académicos sobre contaminación AmbientalQuerétaro 76010Qro.México DIPFI Facultad de IngenieríaUniversidad Autónoma de QuerétaroC.U.Cerro de las CampanasCentroQuerétaro 76010Qro.México Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología AvanzadaUnidad QuerétaroCerro Blanco No.141Colinas del CimatarioQuerétaro76090Qro.México DIP-CUCEI Universidad de GuadalajaraJoséGuadalupe Zuno#48Los BelenesZapopan 45100Jal.México Facultad de Farmacia Universidad Autónoma del Estado de MorelosAv.Universidad#1001Cuernavaca 62209Mor.México Departamento de Ingeniería Universidad de GuanajuatoGuanajuato 36000México

Environmental problems that came from the human activity have many facets,since pollution of the atmosphere arises from vehicles,industrial emissions while pollution of water could be from organic compounds,pesticides *** can cause serious health effects,such as respiratory diseases,including asthma and lung ***,in the present work,a kinetic study on the effective adsorption and photo degradation of methylene blue(MB)dye,under ultraviolet A(UVA)irradiation of an alkali activated inorganic polymer(geopolymer)with homogeneously dispersed titanium dioxide(TiO2)micro-particles is *** addition,antimicrobial testing of the alkali activated TiO2 material was performed showing a bacteriostatic effect.

关键词： Heterogeneous photocatalysis semiconductor alkali activated bacteriostatic effect

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