Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357535
Yang Liu, F. Sun, Guojun Wang, Pengfei Zou
In this study, the nanoindentation properties of the as-soldered low-Ag SAC-Bi-Ni solder alloys on Cu substrate were characterized. The overall evaluations on the elastic modulus, hardness, and creep properties of the new solder alloys were proposed based on the comparisons with low-Ag solder SAC0307, SAC0705, and high-Ag solder SAC305. Experimental results indicated that the hardness of the SAC solders without Bi and Ni addition varied from 127MPa to 196MPa. Meanwhile, the elastic modulus was between 29-36GPa, and the creep stress sensitivity was from 15 to 19. However, the hardness of low-Ag SAC-Bi-Ni solders was between 305-403MPa. Additionally, with Bi and Ni elements addition, the elastic modulus of SAC0705 increased to 35-63GPa, and the value of creep stress sensitivity reached to 25-45. It is clear that the addition of Bi and Ni in low-Ag SAC solder greatly improved its nanoindentation properties, which were critical for the solder joint reliability.
{"title":"Nanoindentation properties of as-soldered low-Ag SAC-Bi-Ni/Cu","authors":"Yang Liu, F. Sun, Guojun Wang, Pengfei Zou","doi":"10.1109/IFOST.2012.6357535","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357535","url":null,"abstract":"In this study, the nanoindentation properties of the as-soldered low-Ag SAC-Bi-Ni solder alloys on Cu substrate were characterized. The overall evaluations on the elastic modulus, hardness, and creep properties of the new solder alloys were proposed based on the comparisons with low-Ag solder SAC0307, SAC0705, and high-Ag solder SAC305. Experimental results indicated that the hardness of the SAC solders without Bi and Ni addition varied from 127MPa to 196MPa. Meanwhile, the elastic modulus was between 29-36GPa, and the creep stress sensitivity was from 15 to 19. However, the hardness of low-Ag SAC-Bi-Ni solders was between 305-403MPa. Additionally, with Bi and Ni elements addition, the elastic modulus of SAC0705 increased to 35-63GPa, and the value of creep stress sensitivity reached to 25-45. It is clear that the addition of Bi and Ni in low-Ag SAC solder greatly improved its nanoindentation properties, which were critical for the solder joint reliability.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122227268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357735
J. Khashbat, T. Tsevegjav, J. Myagmarjav, I. Bazarragchaa, A. Erdenetuya, N. Munkhzul
This research is focused on the results that determined the driver's reaction time. For conducting the experiment, two methodologies were worked out to determine the driver's reaction time. As a result of determining the driver's reaction time in stationary and real-life environments following these methodologies, the statistic processing was made. Driver's age and driving experience are the leading factors to influence on the driver's reaction time. To determine the driver's reaction time in a real-life environment, we selected the condition in which the traffic speed and intensity are constant. As a result of the experiment and the research, the statistic processing was made, consequently, the two factor linear equation of regression was developed. Also, the comparitive research was made on the cases of the reaction time which were defined by two different methodologies, and the results have been determined.
{"title":"Determining the driver's reaction time in the stationary and real-life environments (Comparative Study)","authors":"J. Khashbat, T. Tsevegjav, J. Myagmarjav, I. Bazarragchaa, A. Erdenetuya, N. Munkhzul","doi":"10.1109/IFOST.2012.6357735","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357735","url":null,"abstract":"This research is focused on the results that determined the driver's reaction time. For conducting the experiment, two methodologies were worked out to determine the driver's reaction time. As a result of determining the driver's reaction time in stationary and real-life environments following these methodologies, the statistic processing was made. Driver's age and driving experience are the leading factors to influence on the driver's reaction time. To determine the driver's reaction time in a real-life environment, we selected the condition in which the traffic speed and intensity are constant. As a result of the experiment and the research, the statistic processing was made, consequently, the two factor linear equation of regression was developed. Also, the comparitive research was made on the cases of the reaction time which were defined by two different methodologies, and the results have been determined.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122234741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357532
E. Yunda, A. Godymchuk
Inhaled from the ambient air nanoparticles may reach innermost areas of respiratory tract, alveolar sacs, particularly. In this work the dissolution of electroexplosive zinc nanoparticles (62 nm) in the synthetic alveolar has been studied. The evidence of the total solubility (99%) of metal nanopowders in the synthetic alveolar fluid had been demonstrated with the help of the stripping voltammetry. Alongside, the mechanism of zinc nanoparticles dissolution related to the electroexplosive zinc nanoparticles completely dissolving in the synthetic alveolar fluid has been proposed.
{"title":"Dissolution of zinc nanoparticles in pulmonary fluid","authors":"E. Yunda, A. Godymchuk","doi":"10.1109/IFOST.2012.6357532","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357532","url":null,"abstract":"Inhaled from the ambient air nanoparticles may reach innermost areas of respiratory tract, alveolar sacs, particularly. In this work the dissolution of electroexplosive zinc nanoparticles (62 nm) in the synthetic alveolar has been studied. The evidence of the total solubility (99%) of metal nanopowders in the synthetic alveolar fluid had been demonstrated with the help of the stripping voltammetry. Alongside, the mechanism of zinc nanoparticles dissolution related to the electroexplosive zinc nanoparticles completely dissolving in the synthetic alveolar fluid has been proposed.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127921255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357741
A. Begmatov, A. Seidullaev, A. O. Pirimbetov
We study problems of recovering a function given by weighted integrals over plane curves of a special shape. The curves and weight functions are piecewise smooth. Such problems of integral geometry are connected with the problems of reconstruction of internal structure of an object from the boundary data. We reduce these problems to the investigation of Fredholm equations of first kind. Stability estimates for a solution to the considered problems in spaces of finite smoothness were obtained thereby demonstrating weak ill-posedness of the problem. We present also an efficient algorithm for stable solving of initial problem.
{"title":"Reconstruction stability in some problems of X-ray and seismic tomography","authors":"A. Begmatov, A. Seidullaev, A. O. Pirimbetov","doi":"10.1109/IFOST.2012.6357741","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357741","url":null,"abstract":"We study problems of recovering a function given by weighted integrals over plane curves of a special shape. The curves and weight functions are piecewise smooth. Such problems of integral geometry are connected with the problems of reconstruction of internal structure of an object from the boundary data. We reduce these problems to the investigation of Fredholm equations of first kind. Stability estimates for a solution to the considered problems in spaces of finite smoothness were obtained thereby demonstrating weak ill-posedness of the problem. We present also an efficient algorithm for stable solving of initial problem.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132595646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357517
N. K. Rizhakova, N. S. Rogova, E. Pokrovskaya
Semi-empirical transfer model of chemical contaminants in the atmosphere from a point source is considered in the report. The model is based on solving the diffusivity equation that takes account of the transport of impurities in the horizontal direction due to wind, turbulent diffusion and gravitational deposition in a vertical direction. In the report it is suggested to determine the modeling parameters by measurements of atmospheric pollution at several points. These points are selected in a particular direction. Epiphytic mosses are used as depositing of pollution objects. Chemical elements concentrations are determined with the help of neutron activation analysis. The considered model is used to estimate the influence zone of a point source on the basis of thermal power plant (TPP-5 Novosibirsk).
{"title":"Determination of the influence zone on the atmospheric pollution of chemical elements from a point source (Combined heat and power)","authors":"N. K. Rizhakova, N. S. Rogova, E. Pokrovskaya","doi":"10.1109/IFOST.2012.6357517","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357517","url":null,"abstract":"Semi-empirical transfer model of chemical contaminants in the atmosphere from a point source is considered in the report. The model is based on solving the diffusivity equation that takes account of the transport of impurities in the horizontal direction due to wind, turbulent diffusion and gravitational deposition in a vertical direction. In the report it is suggested to determine the modeling parameters by measurements of atmospheric pollution at several points. These points are selected in a particular direction. Epiphytic mosses are used as depositing of pollution objects. Chemical elements concentrations are determined with the help of neutron activation analysis. The considered model is used to estimate the influence zone of a point source on the basis of thermal power plant (TPP-5 Novosibirsk).","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128920173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357757
I. Shamanin, M. Kazaryan, I. Lomov, S. Dolgopolov
The possibility of the use the phenomena of the electrical-induced selective drift of cationic aquacomplexes in the water solution of the salts for creating of the new, non-electrode, power-saving technology of the solution enrichment by desired element is shown. The development of the naturally-scientific basis of this technology has showed that inertial properties of formed in the solution over-molecular structural units - clusters depends from that's dimensions. Dimensions of these clusters are in limits from scores of angstrom to fractions of micron, at the same time liquid mediums are the base of functioning both biological and technological systems. This work shows new approach for theoretical describing of salts solution in dielectric liquids and contains some data on the realized experiments.
{"title":"Application of electrical induced selective drift of solvated ions in solutions phenomena in chemical technologies","authors":"I. Shamanin, M. Kazaryan, I. Lomov, S. Dolgopolov","doi":"10.1109/IFOST.2012.6357757","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357757","url":null,"abstract":"The possibility of the use the phenomena of the electrical-induced selective drift of cationic aquacomplexes in the water solution of the salts for creating of the new, non-electrode, power-saving technology of the solution enrichment by desired element is shown. The development of the naturally-scientific basis of this technology has showed that inertial properties of formed in the solution over-molecular structural units - clusters depends from that's dimensions. Dimensions of these clusters are in limits from scores of angstrom to fractions of micron, at the same time liquid mediums are the base of functioning both biological and technological systems. This work shows new approach for theoretical describing of salts solution in dielectric liquids and contains some data on the realized experiments.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134620548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357623
Feihu Jin, Guang Shu
The artificial bee colony algorithm is a novel simulated evolutionary algorithm. The artificial bee colony algorithm has positive feedback, distributed computation and a constructive greedy heuristic convergence. Back propagation is a kind of feed forward neural network widely used in many areas, but it has some shortcomings, such as low precision solutions, slow search speed and easy convergence to the local minimum. The combination of artificial bee colony algorithm and back propagation neural network is adopted so that a nonlinear model can be identified and an inverted pendulum can be controlled. Simulation results show that the extensive mapping ability of neural network and the rapid global convergence of artificial bee colony algorithm can be obtained by combining artificial bee colony algorithm and neural network.
{"title":"Back propagation neural network based on artificial bee colony algorithm","authors":"Feihu Jin, Guang Shu","doi":"10.1109/IFOST.2012.6357623","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357623","url":null,"abstract":"The artificial bee colony algorithm is a novel simulated evolutionary algorithm. The artificial bee colony algorithm has positive feedback, distributed computation and a constructive greedy heuristic convergence. Back propagation is a kind of feed forward neural network widely used in many areas, but it has some shortcomings, such as low precision solutions, slow search speed and easy convergence to the local minimum. The combination of artificial bee colony algorithm and back propagation neural network is adopted so that a nonlinear model can be identified and an inverted pendulum can be controlled. Simulation results show that the extensive mapping ability of neural network and the rapid global convergence of artificial bee colony algorithm can be obtained by combining artificial bee colony algorithm and neural network.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"353 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120838782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357486
M. Sedelnikova, N. V. Liseenko, V. Pogrebenkov
The possibility of ceramic pigments synthesis using industrial waste is studied. These raw materials will lower production costs of ceramic pigments. The synthesized pigments can be recommended for obtaining on-glaze ceramic paints and volume coloring of ceramic pastes in the manufacture of construction materials.
{"title":"Ceramic pigments based on the dicalcium silicate","authors":"M. Sedelnikova, N. V. Liseenko, V. Pogrebenkov","doi":"10.1109/IFOST.2012.6357486","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357486","url":null,"abstract":"The possibility of ceramic pigments synthesis using industrial waste is studied. These raw materials will lower production costs of ceramic pigments. The synthesized pigments can be recommended for obtaining on-glaze ceramic paints and volume coloring of ceramic pastes in the manufacture of construction materials.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116196268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357823
A. Prokhorov, Y. Borovikov, M. Andreev
This paper presents new tool for setting up and comprehensive close loop testing of protection, automation and control equipment (PACE). The role of this tool for Smart Grid (SG) design process is also described. Comprehensive close loop tests of PACE in power system (PS) various regimes with consideration of possible interactions between tested equipment and other automation are possible only with the use of real-time software and hardware simulators. But digital simulators are based on numerical methods of integration and therefore impose constraints on differential order and stiffness of a mathematical model of PS. Besides, each step of differential equation integration causes the error which is accumulated and cannot be eliminated. Because of this a simulation time is very restricted and simulation itself can never be continuous. New capabilities are provided with the use of a hybrid simulation concept which has no mentioned limitations. The concept of hybrid simulation was created at Tomsk Polytechnic University and became a base for construction of Hybrid Real-Time Power System Simulator (HRTSim). HRTSim is a multipurpose tool suitable for various power engineering tasks, among which are PACE setting up and testing. Practical results of HRTSim application in the Tyumen PS are presented in this paper. HRTSim was used there for testing and setting up of momentary and sustained fast turbine valving control (FTVC) systems of the generating unit of the Surgut co-generation power plant.
{"title":"Application of hybrid real-time power system simulator for setting up and close loop testing of protection and control equipment","authors":"A. Prokhorov, Y. Borovikov, M. Andreev","doi":"10.1109/IFOST.2012.6357823","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357823","url":null,"abstract":"This paper presents new tool for setting up and comprehensive close loop testing of protection, automation and control equipment (PACE). The role of this tool for Smart Grid (SG) design process is also described. Comprehensive close loop tests of PACE in power system (PS) various regimes with consideration of possible interactions between tested equipment and other automation are possible only with the use of real-time software and hardware simulators. But digital simulators are based on numerical methods of integration and therefore impose constraints on differential order and stiffness of a mathematical model of PS. Besides, each step of differential equation integration causes the error which is accumulated and cannot be eliminated. Because of this a simulation time is very restricted and simulation itself can never be continuous. New capabilities are provided with the use of a hybrid simulation concept which has no mentioned limitations. The concept of hybrid simulation was created at Tomsk Polytechnic University and became a base for construction of Hybrid Real-Time Power System Simulator (HRTSim). HRTSim is a multipurpose tool suitable for various power engineering tasks, among which are PACE setting up and testing. Practical results of HRTSim application in the Tyumen PS are presented in this paper. HRTSim was used there for testing and setting up of momentary and sustained fast turbine valving control (FTVC) systems of the generating unit of the Surgut co-generation power plant.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128695721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-26DOI: 10.1109/IFOST.2012.6357526
M. Surmeneva, R. Surmenev, V. Pichugin, A. Ivanova, I. Grubova, M. Chaikina, I. Khlusov, A. Kovtun, M. Epple
The aim of this study was to prevent the problems associated with implants failure. Biocompatible nanostructured thin films of either Si- or Ag-containing non-stoichiometric hydroxyapatite (HA) were deposited by method of radio-frequency (rf) magnetron sputtering. Plates of Ti, Ti6Al4V and 316 L SS were used as substrates. The thin coatings were characterized by EDX, ESEM, XRD, IR spectroscopy, HRTEM, nanoindentation and scratch-test. HRTEM observations of the coatings showed a nanocrystalline structure mixed with amorphous regions. It was found that the morphology, structure and the preferred orientation of the films are greatly affected by the parameters of deposition (rf-power, substrate temperature and voltage bias). The as-deposited modified CaP-based coatings are dense, pore-free and their composition resembles that of the precursor target composition. The Si- and Ag- containing HA coatings had a hardness of 10-12 GPa. A low rf-power (30 W) resulted in amorphous or low crystalline CaP coating structure. An increase in rf-power (>; 200 W) induced the coating crystallization. The occurrence of the different structure types is described as function of the bias voltage and temperatures. The negative substrate bias allowed to vary the Ca/P ratio in the range of 1.53 to 4. In vitro biocompatibility assessments of the films using the MG63 osteoblast-like cells indicated excellent cell adherence and surface colonization. Si-containing rf-magnetron films promote osteogenic differentiation of human stromal stem cells in vitro. The coatings are prospective to be used in clinical practice: in stomatology or craniofacial medicine, where the leaching of toxic ions from the substrate is necessary or the initial material surface porosity for a further bone in growth should be preserved.
本研究的目的是预防与种植体失败相关的问题。采用射频磁控溅射法制备了具有生物相容性的含硅或含银非化学计量羟基磷灰石(HA)纳米薄膜。采用Ti、Ti6Al4V和316 L SS作为衬底。采用EDX、ESEM、XRD、IR、HRTEM、纳米压痕和划痕测试对涂层进行了表征。HRTEM观察表明，涂层为纳米晶结构，并掺杂非晶区。结果表明，沉积参数(rf功率、衬底温度和电压偏置)对薄膜的形貌、结构和择优取向有很大影响。沉积的改性cap基涂层致密、无孔，其组成与前驱体目标组合物相似。含硅和银的羟基磷灰石涂层的硬度为10 ~ 12gpa。低射频功率(30w)产生非晶或低晶的CaP涂层结构。射频功率增加(>;200w)诱导涂层结晶。不同结构类型的出现被描述为偏置电压和温度的函数。负衬底偏压允许在1.53至4的范围内改变Ca/P比率。使用MG63成骨细胞样细胞对膜进行体外生物相容性评估，显示出良好的细胞粘附和表面定植。含硅射频磁控管膜促进人基质干细胞体外成骨分化。该涂层有望用于临床实践:在口腔医学或颅面医学中，从基质中浸出有毒离子是必要的，或者为了进一步的骨骼生长，应该保留最初的材料表面孔隙。
{"title":"Biocompatible nanostructured coatings based on calcium phosphates prepared by means of rf-magnetron sputtering deposition","authors":"M. Surmeneva, R. Surmenev, V. Pichugin, A. Ivanova, I. Grubova, M. Chaikina, I. Khlusov, A. Kovtun, M. Epple","doi":"10.1109/IFOST.2012.6357526","DOIUrl":"https://doi.org/10.1109/IFOST.2012.6357526","url":null,"abstract":"The aim of this study was to prevent the problems associated with implants failure. Biocompatible nanostructured thin films of either Si- or Ag-containing non-stoichiometric hydroxyapatite (HA) were deposited by method of radio-frequency (rf) magnetron sputtering. Plates of Ti, Ti6Al4V and 316 L SS were used as substrates. The thin coatings were characterized by EDX, ESEM, XRD, IR spectroscopy, HRTEM, nanoindentation and scratch-test. HRTEM observations of the coatings showed a nanocrystalline structure mixed with amorphous regions. It was found that the morphology, structure and the preferred orientation of the films are greatly affected by the parameters of deposition (rf-power, substrate temperature and voltage bias). The as-deposited modified CaP-based coatings are dense, pore-free and their composition resembles that of the precursor target composition. The Si- and Ag- containing HA coatings had a hardness of 10-12 GPa. A low rf-power (30 W) resulted in amorphous or low crystalline CaP coating structure. An increase in rf-power (>; 200 W) induced the coating crystallization. The occurrence of the different structure types is described as function of the bias voltage and temperatures. The negative substrate bias allowed to vary the Ca/P ratio in the range of 1.53 to 4. In vitro biocompatibility assessments of the films using the MG63 osteoblast-like cells indicated excellent cell adherence and surface colonization. Si-containing rf-magnetron films promote osteogenic differentiation of human stromal stem cells in vitro. The coatings are prospective to be used in clinical practice: in stomatology or craniofacial medicine, where the leaching of toxic ions from the substrate is necessary or the initial material surface porosity for a further bone in growth should be preserved.","PeriodicalId":319762,"journal":{"name":"2012 7th International Forum on Strategic Technology (IFOST)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127481394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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