Transcription of Nanofibrous Cerium Phosphate Using a pH-Sensitive Lipodipeptide Hydrogel Template
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Altres documents de l'autoria: Llusar, Mario; Escuder, Beatriu; López Castro, Juan de Dios; Trasobares Llorente, Susana; Monrós Andreu, Guillem
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comunitat-uji-handle3:10234/8639
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Títol
Transcription of Nanofibrous Cerium Phosphate Using a pH-Sensitive Lipodipeptide Hydrogel TemplateAutoria
Data de publicació
2017-06-10Editor
MDPICita bibliogràfica
LLUSAR, Mario; ESCUDER GIL, Beatriu; LÓPEZ CASTRO, Juan de Dios; TRASOBARES LLORENTE, Susana; MONRÓS ANDREU, Guillem. Transcription of Nanofibrous Cerium Phosphate Using a pH-Sensitive Lipodipeptide Hydrogel Template. Gels (2017), v. 3, n. 23Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://www.mdpi.com/2310-2861/3/2/23Versió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
A novel and simple transcription strategy has been designed for the template-synthesis
of CePO4 xH2O nanofibers having an improved nanofibrous morphology using a pH-sensitive
nanofibrous hydrogel (glycine-alanine ... [+]
A novel and simple transcription strategy has been designed for the template-synthesis
of CePO4 xH2O nanofibers having an improved nanofibrous morphology using a pH-sensitive
nanofibrous hydrogel (glycine-alanine lipodipeptide) as structure-directing scaffold. The phosphorylated
hydrogel was employed as a template to direct the mineralization of high aspect ratio nanofibrous
cerium phosphate, which in-situ formed by diffusion of aqueous CeCl3 and subsequent drying (60 C)
and annealing treatments (250, 600 and 900 C). Dried xerogels and annealed CePO4 powders were
characterized by conventional thermal and thermogravimetric analysis (DTA/TG), and Wide-Angle
X-ray powder diffraction (WAXD) and X-ray powder diffraction (XRD) techniques. A molecular
packing model for the formation of the fibrous xerogel template was proposed, in accordance with
results from Fourier-Transformed Infrarred (FTIR) and WAXD measurements. The morphology,
crystalline structure and composition of CePO4 nanofibers were characterized by electron microscopy
techniques (Field-Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron
Microscopy/High-Resolution Transmission Electron Microscopy (TEM/HRTEM), and Scanning
Transmission Electron Microscopy working in High Angle Annular Dark-Field (STEM-HAADF))
with associated X-ray energy-dispersive detector (EDS) and Scanning Transmission Electron
Microscopy-Electron Energy Loss (STEM-EELS) spectroscopies. Noteworthy, this templating
approach successfully led to the formation of CePO4 H2O nanofibrous bundles of rather co-aligned
and elongated nanofibers (10–20 nm thick and up to ca. 1 m long). The formed nanofibers
consisted of hexagonal (P6222) CePO4 nanocrystals (at 60 and 250 C), with a better-grown and
more homogeneous fibrous morphology with respect to a reference CePO4 prepared under similar
(non-templated) conditions, and transformed into nanofibrous monoclinic monazite (P21/n) around
600 C. The nanofibrous morphology was highly preserved after annealing at 900 C under N2,
although collapsed under air conditions. The nanofibrous CePO4 (as-prepared hexagonal and
900 C-annealed monoclinic) exhibited an enhanced UV photo-luminescent emission with respect to
non-fibrous homologues. [-]
Publicat a
Gels (2017), v. 3, n. 23Proyecto de investigación
1) Spanish “Ministerio de Ciencia e Innovación” (Project MAT2008-02893) and 2) Spanish “Ministerio de Economía y Competividad” (Project MAT2015-69443-P) for financial supportDrets d'accés
info:eu-repo/semantics/openAccess
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