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Influence of ionic liquid characteristics on the performance of ternary solid p...
Barbosa, João Carlos; Correia, Daniela Maria Silva; Nunes, Paulo; Fernandes, Mariana; Fidalgo-Marijuan, Arkaitz; Gonçalves, Renato FerreiraSolid polymer electrolytes (SPEs) are the necessary step towards solid-state lithium-ion batteries (LIBs). Their function as separator and electrolyte allows to increase the safety of energy storage devices by the elimination of the liquid components. In this work, three-component SPEs based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as host polymer, clinoptilolite zeolite, and different ion...
Influence of solvent evaporation temperature on the performance of ternary soli...
Barbosa, João C.; Correia, Daniela Maria Silva; Fidalgo-Marijuan, Arkaitz; Gonçalves, Renato Ferreira; Ferdov, Stanislav; de Zea Bermudez, VerónicaSolid polymer electrolytes (SPEs) will allow improving safety and durability in next-generation solid-state lithium-ion batteries (LIBs). Within the SPE class, ternary composites are a suitable approach as they provide high room-temperature ionic conductivity and excellent cycling and electrochemical stability. In this work, ternary SPEs based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as a ...
Three-component solid polymer electrolytes based on li-ion exchanged microporou...
Barbosa, João C.; Correia, Daniela Maria Silva; Salado, Manuel; Gonçalves, Renato Ferreira; Ferdov, Stanislav; De Zea Bermudez, VerónicaLithium ion-batteries (LIBs) are the most widely used devices in the area of electrical energy storage. However, several limitations regarding durability and safety are holding them back when it comes to larger applications, such as electric mobility. In this context, solid polymer electrolytes (SPEs) represent one of the most suitable options to overcome these issues. In this work, three-component SPEs based o...
UV-light assisted synthesis of high silica faujasite-type of zeolites
Ferdov, Stanislav; Marques, Juliana; Tavares, Carlos J.; Lin, Zhi; Mori, Souhei; Tsunoji, NaoCurrently, the direct synthesis of faujasite-type (FAU) zeolites with Si/Al ratios greater than 3 depends on organic or inorganic additives. Here, we report the first additive-free synthesis of faujasite with Si/Al ratios greater than 3 using ultraviolet (UV) light assistance. The obtained zeolite shows excellent catalytic performance comparable to the commercial zeolite Y.
The first hafnium germanate with garnet-type of structure: mild hydrothermal sy...
Ferdov, Stanislav; Lin, ZhiSodium hafnium germanate, Na3Hf1.7Ge3O10(OH)1.8, with garnet-type of structure was synthesized as a single phase, nanoparticles (100–600 nm) at mild hydrothermal conditions (230 °C) and autogenous pressure. The structure was solved ab initio from powder X-ray diffraction data and subsequently refined [Rexp: 6.10, Rwp: 7.26, Rp: 5.39, GOF: 1.19, RB: 1.50] by the method of Rietveld. The solid crystallizes in cubi...
Ti1−xAgx electrodes deposited on polymer based sensors
Marques, S. M.; Manninen, N. K.; Ferdov, Stanislav; Lanceros-Mendez, S.; Carvalho, S.Piezoelectric materials are interesting for the development of sensors and actuators for biomedical applications in areas such as smart prosthesis, implantable biosensors and biomechanical signal monitoring, among others. For acquiring or applying the electrical signal from/to the piezoelectric material, suitable electrodes can be produced from Ti based coatings with tailored multifunctional properties: conduct...
Hydrothermal Synthesis of Copper Zirconium Phosphate Hydrate [Cu(OH)(2)Zr(HPO4)...
Zhang, Xiaosheng; Xu, Hong; Zuo, Zhijun; Lin, Zhi; Ferdov, Stanislav; Dong, JinxiangCopper zirconium phosphate hydrate (Cu(OH)(2)Zr(HPO4)2 center dot 2H(2)O, hereafter referred to as Cu-alpha-ZrP) with high crystallinity was directly synthesized in a NaF-CuO-ZrO-P2O5-H2O system under hydrothermal conditions. The copper ion was confirmed to be an exchangeable cation in the Cu-alpha-ZrP through elemental analysis and a proton ion exchange process. The crystal structure of the Cu-alpha-ZrP was de...
A microporous titanosilicate for selective killing of HeLa cancer cells
Ferdov, Stanislav; Shikova, Evelina; Ivanova, Zina; Dimowa, Louiza T.; Nikolova, Rositsa P.; Lin, Zhi; Shivachev, Boris L.Structural distribution of zinc(II) ions in the pore system of three silicate molecular sieves has revealed an unprecedented application of the microporous titanosilicate Zn-ETS-4 as a non toxic, highly efficient and selective inhibitor of HeLa cancer cells.
Photoluminescent Layered Lanthanide Silicate Nanoparticles
Ananias, Duarte; Ferdov, Stanislav; Paz, Filipe A. Almeida; Ferreira, Rute A. Sá; Ferreira, Artur; Geraldes, Carlos F. G. C.; Carlos, Luís D.; Lin, ZhiThe first examples of nanoparticles of pure layered Ln2(SiO4H)(OH)2(H2O)Cl (where Ln ) Eu, Gd, and Tb) and mixed microcrystalline layered lanthanide silicates containing different Eu/Gd and Tb/Gd ratios have been reported. The crystal structure of these silicates has been solved from synchrotron powder X-ray diffraction data. These materials display interesting and tuneable photoluminescence (PL) properties, su...