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Synthesis of coral-like structures of pr-Yb co-doped YIG: Structural,optical, magnetic and antimicrobial properties

Journal of Rare Earths 2024年第3期42卷 543-554,I0004页

作者： A.Fernandez francisca p.araujo Y.Guerra S.Castro-Lopes J.Matilla-Arias Idglan S.de Lima Edson C.Silva-Filho Josy A.Osajima F.Guerrero R.pena-Garcia Federal University of piau Graduate Program in Materials Science and EngineeringTeresinaPIBrazil Federal Rural University of pernambuco Academic Unit of Cabo de Santo AgostinhoCabo de Santo AgostinhoPEBrazil Federal University of piaui Department of PhysicTeresinaPBrazil Federal University of pernambuco Graduate Program in Materials ScienceRecifePEBrazil University of Granma Departmentof Basic Sciences and Applied InformaticsFaculty of Technical SciencesBayamoCuba Federal University of Amazonas Department of PhysicManausAMBrazil Federal University of pernambuco Department of PhysicRecifePEBrazil

Coral-like structures of the Y_(3-x)pr_(x)Fe_(5-y)Yb_(y)O_(12),(0.00 ≤ x ≤ 0.04, 0.00 ≤ y ≤ 0.02) compound were synthesized using the sol-gel method. Structural investigation certified the YIG cubic crystal structure formation, without any secondary phase. It is shown that, the relatively large ionic radius of the dopant cations results in an expansion of the lattice parameter, variations in the Iona-O-Iondangle, Iona-O,Iond-O and Ionc-O bond distances and decrease in the average crystallite size. Fourier transform infrared(FTIR) and Raman measurements are essential to testify the single-phase formation of YIG crystal structure and are observed changes in the stretching and vibrational modes, respectively. The morphological study, energy dispersive spectroscopy(EDS) spectra and textural properties show corallike structures, peaks associated with pr^(3+) and Yb^(3+) atoms and the effect of dopants on surface area,diameter, and pore volume, respectively. The optical analysis from diffuse reflectance spectra witnessed an increase in the optical gap band, a decrease in Urbach energy and blue shift in the charge transfer,correlated with the expansion of the unit cell due to the dopant's insertion in the YIG structure. A typical ferrimagnetic behavior is exhibited by the Y_(3-x)pr_(x)Fe_(5-y)Yb_(y)O_(12)compound. The saturation magnetization(M_(s)), cubic anisotropy constant(K_(1)) and coercive field(H_(c)) increase with the pr^(3+)cations content, as consequence of their magnetic nature and distribution around of Fe^(3+)ions due to the coexistence with the Yb^(3+). Finally, for the first time, antibacterial tests by mean of the direct contact method were performed for YIG co-doped with pr^(3+)and Yb^(3+)and it is shown that, relatively high dosages of pr^(3+) cations favored the activity against S. aureus, therefore, a new biological property for YIG doped with rare earths is presented.

关键词： Yttrium iron garnet(YIG) Coral-like structures Rare earths Band gap energy Magnetic properties Antimicrobial properties

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A prospective cancer chemo-immunotherapy approach mediated by synergistic CD326 targeted porous silicon nanovectors

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Nano Research 2015年第5期8卷 1505-1521页

作者： Mohammad-Ali Shahbazi Neha Shrestha Ermei Makila francisca araujo Alexandra Correia Tomas Ramos Bruno Sarmento Jarno Salonen Jouni Hirvonen Helder A. Santos Division of pharmaceutical Chemistry and Technology Faculty of Pharmacy University ofHelsinki FI-00014 Helsinki Finland Laboratory of Industrial physics Departmen t of Physics and Astronomy University of Turku FI-20014 Turku Finland INEB - Instituto de Engenharia Biomedica NewTherapies Group Universidade do Porto Rua do Campo Alegre 823 4150-180 Porto Portuga ICBAS - Instituto Ciencias Biomedicas Abel Salazar University of Porto Rua de Jorge Viterbo Ferreira 4050-313 Porto Portugal Faculty of pharmacy University of Coimbra 3000-548 Coimbra Portugal IINFACTS - Instituto de Investigacao e Formacao Avancada em Ciencias e Tecnologias da Saude Instituto Superior de Ciencias da Saude-Norte Department of Pharmaceutical Sciences CESPU Rua Central de Gandra 4585-116 Gandra Portugal

经由 nanoparticulate 系统的联合治疗已经为癌症治疗作为一条 synergistic 途径被建议了。此处， undecylenic 酸热地修改了多孔的硅 nanoparticles (UnTHCpSi Np ) 与 sorafenib 装载了的 hydrocarbonized，有 anti-CD326 抗体(Ab ) ... 详细信息

经由 nanoparticulate 系统的联合治疗已经为癌症治疗作为一条 synergistic 途径被建议了。此处， undecylenic 酸热地修改了多孔的硅 nanoparticles (UnTHCpSi Np ) 与 sorafenib 装载了的 hydrocarbonized，有 anti-CD326 抗体(Ab ) 的 surface-biofunctionalized 在 MCF-7 和 MDA-MB-231 乳癌房间为癌症 chemo 免疫疗法被开发。cytocompatibility 学习没在比 200 g 低的集中为赤裸、结合抗体的 UnTHCpSi (Un-Ab ) Np 显示出重要毒性 ? 浩汰楹杮愠搠 ' 糖锚?湩琠敨漠潸桰汩捩瑩 ? 景琠敨猠牵慦散倠 ? 瑡浯吗？

关键词：免疫治疗剂癌症治疗协同方法多孔硅介导化疗乳腺癌细胞纳米粒子

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