Structural characterization of PDMS–TEOS–CaO–TiO2 hybrid materials obtained by sol–gel

Almeida, J. Carlos; Castro, Alichandra; Lancastre, J.J.H.; Salvado, Isabel M. Miranda; Margaça, F.M.A.; Fernandes, Maria Helena; Ferreira, L.M.; Casimiro, Maria Helena

doi:10.1016/j.matchemphys.2013.09.032

Cited by 24 publications

(29 citation statements)

References 48 publications

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“…In the case of K preparation, those D OH 1 − D OH 1 dimers, using the notation defined by Glaser et al [22], will react first with the TiPr propoxide being not cleaved when they are subsequently added to an acidic medium. When analysing the distribution of silica based structures the predominance of full condensed Q 4 structures can be observed in all compositions, which is in line with the authors previous works [15]. Brus [41] reported in a structural study of hybrid materials prepared from dimethyldiethoxysilane (DMDES) and TEOS that using an increased DMDEOS/TEOS molar ratio produced more crosslinked D-Q bonds and resulted in a decrease in the Q 3 /Q 4 ratio.…”

Section: H} Nmr Cp-mas Analysissupporting

confidence: 90%

“…Comparing in Table 2 the distribution of structural units, it is observed that a higher number of very short hybrid structures (D A ) (I sample) is not followed by a corresponding lower number of Q 3 or Q 1 structures. These differences can be explained by the authors' previous findings [15], namely that some of the less condensed Q structures, Q 3 and Q 1 , are not only associated with hydroxyl groups, but also with titanium and calcium. Si spins due to the presence of protonated groups directly bonded to some Si structural units [49].…”

Section: H} Nmr Cp-mas Analysismentioning

confidence: 90%

“…In order to prevent this, a thermal step using temperatures above 400º C is essential, which may lead to thermal degradation of the materials prepared [15]. Other calcium sources were tried, such as calcium chloride or calcium methoxyethoxide, but some processing related problems still persisted [8].…”

Section: +mentioning

confidence: 99%

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PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

Almeida

Wacha

Gomes

et al. 2016

Materials Science and Engineering: C

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Two biocompatible PDMS-SiO 2 -TiO 2 -CaO porous hybrid materials were prepared using the same base composition, precursors, and solvents, but following two different sol-gel procedures, based on the authors' previous works where for the first time, in this hybrid system, calcium acetate was used as calcium source. The two different procedures resulted in monolithic materials with different structures, microstructures, and surface wettability. Even though both are highly hydrophobic (contact angles of 127.2° and 150.6°), and present different filling regimes due to different surface topographies, they have demonstrated to be biocompatible when tested with human osteoblastic cells, against the accepted idea that high-hydrophobic surfaces are not suitable to cell adhesion and proliferation. At the nanoscale, the existence of hydrophilic silica domains containing calcium, where water molecules are physisorbed, is assumed to support this capability, as discussed.

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Section: H} Nmr Cp-mas Analysissupporting

confidence: 90%

Section: H} Nmr Cp-mas Analysismentioning

confidence: 90%

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PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

Almeida

Wacha

Gomes

et al. 2016

Materials Science and Engineering: C

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“…This description is associated with the biomaterials that seek "inertness" and a direct host response of fibrous connective tissue encapsulation. Recent concepts describe the satisfactory host response as an intimate adjunction of bone to biomaterial without encapsulation denominated as osseointegration.For the achievement of this target several biologic mechanisms must take place, breaches between bone and implant must be filled and bone damage must be repaired.Basically, a fracture bone healing has three stages 34,35,26,9 : …”

mentioning

confidence: 99%

“…A cascade of events follow to continue the physiologic mechanism, inflammation, angiogenesis and granulation tissue formation, fibrous tissue formation, fibrocartilage, hyaline cartilage (soft callus), cartilage mineralization, woven bone (hard callus) and finally remodeling that can take several months to be accomplished 23,26 .…”

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confidence: 99%

Development of hybrid coatings for osseointegration improvement of metal dental implants

Barros¹,

Maria²

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Castellón de la Plana, julio de 2016 Aos meus paisEmpiezo por agradecer a la institución Universitat Jaume I por acogerme durante cinco años, especialmente agradecer al departamento d'Enginyeria de Sistemes Industrials i Disseny. A Isabel Badal, a Javier Vicente, a Roberto Sanchis y a Carlos Vila, gracias por poder contar con vuestra ayuda en todo momento para los trámites y desarrollo de este trabajo.A mis directores, Julio Suay y Raúl Izquierdo, les agradezco su confianza, apoyo y dedicación. De forma especial a Julio por hacerme sentir en todo momento que no estaba sola en este viaje. Gracias por todo lo que me habéis enseñado y por vuestra paciencia en mi proceso de "crecimiento" profesional y personal.Me gustaría agradecer también a Isabel Goñi y Marilo Gurruchaga su ayuda e interés demostrado en el desarrollo de este trabajo. Gracias también por vuestra paciencia y apoyo desde la Universidad del País Vasco. No puedo olvidarme de Beatriz, María y Marije por su esfuerzo y ayuda, gracias.Agradezco también a Luis Cabedo, Jose Gámez y José Javier Gracenea su ayuda y conocimientos transmitidos siempre que os he necesitado.A José Ortega y Raquel Oliver les agradezco su apoyo en todo momento, confianza, paciencia y los buenos ratos que pasamos en los laboratorios.Gracias por vuestros consejos, por escucharnos y atendernos.Quiero mencionar también mi agradecimiento a José Javier Gómez y José Miguel Pedra del Servei d'instrumentació Científica de la UJI por su interés y ayuda. A José Luis Gómez, Laura Teruel y los compañeros del Centro deBiomateriales e Ingeniería Tisular de la Universidad Politécnica de Valencia, gracias por hacerme sentir cómo una persona más de vuestro equipo.A María José Gimeno y Sandra Chamorro por permitirme acceder a las instalaciones de MEDCO y ayudarme siempre que os buscaba. Os agradezco además vuestra amistad y conversaciones sobre "la tesis".Debo referir mi agradecimiento especial a Miriam Hernández, por introducirme en "el sol-gel" y en el mundo de la investigación. Gracias por la gran lección de humildad que me has dado.Agradezco a mis compañeras y amigas Montse, Irene y Ane todo el apoyo, amistad y enseñanzas desde los inicios del grupo PIMA. Gracias Irene por transmitirme tus conocimientos y escucharme en mis "malos momentos". Gracias Montse por tu predisposición siempre por ayudarme y por tus consejos. Gracias Ane por tu ayuda.A Estefanía le agradezco su compañía y ayuda en esos momentos en que su tiempo valía más que el oro, gracias.A Fran, le agradezco su amistad y su apoyo incondicional. Ha sido una maravilla trabajar contigo! A Javi y a Jennifer, unos compañeros siempre predispuestos a ayudar.A todos vosotros, mis compañeros y amigos, gracias por enseñarme el verdadero significado de la palabra "compañerismo" y por tornar más ameno este duro viaje Por fin, me gustaría agradecer a todas aquellas personas sin las cuales no hubiese sido posible concluir este trabajo.Gracias Pili, Ainara, José y Rosa por "estar ahí" siempre que os he necesitado.Gracias Gustavo por tu ayuda, por anim...

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Thermomechanical properties and bioactivity evaluation of silicone rubber composites

et al. 2016

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The effect of incorporation of nanofillers (montmorillonite, silica, hydroxyapatite) and bioactive glass (BG) microparticles into a silicone elastomer matrix, on its thermomechanical properties and bioactivity was investigated. The obtained samples were characterized using differential scanning calorimetry and dynamic mechanical analysis, as well as by hardness, tensile, and tear testing, whereas their bioactivity was evaluated by immersion of specimens into simulated body fluid solution and by cell culture experiments (fibroblasts and osteoblasts). Montmorillonites and especially Cloisite 20A have been shown the most efficient reinforcement for improving mechanical properties of silicone rubber composites. On the other hand, BG and silica hybrids exhibited significant bioactive properties.

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Structural characterization of PDMS–TEOS–CaO–TiO2 hybrid materials obtained by sol–gel

Cited by 24 publications

References 48 publications

PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

PDMS-SiO2-TiO2-CaO hybrid materials – Cytocompatibility and nanoscale surface features

Development of hybrid coatings for osseointegration improvement of metal dental implants

Thermomechanical properties and bioactivity evaluation of silicone rubber composites

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