title: Structural evolution during evaporation of a 3-glycidoxypropyltrimethoxysilane film studied in situ by time resolved infrared spectroscopy.
abstract: Time resolved infrared spectroscopy has been applied to study in situ the evaporation process of a 3-glycidoxypropyltrimethoxysilane hybrid sol by casting a droplet on a ZnSe substrate; the analysis has been performed in the middle-infrared range and in the near-infrared range. The experiment has allowed following the structural changes induced by water evaporation and the formation of ordered structures within the cast film; the CH(2) scissoring bands have been used as a fingerprint for the disorder to order transition of the hybrid. The experiment has been done using both a fresh sol and an aged sol which produce respectively an amorphous material and a crystalline hybrid material. The analysis has shown that the epoxy groups do not react during the evaporation while the silica structure shows only a slight condensation and an increase in open cage-like species. At the end of evaporation the hybrid has a "soft-like" state which allows structural rearrangements to self-order.
authors.affiliation: DADU, Laboratorio di Scienza dei Materiali e Nanotecnologie (LMNT), Università di Sassari and CR-INSTM, CNBS, Palazzo Pou Salit, Piazza Duomo 6, 07041 Alghero (Sassari), Italy. plinio@uniss.it
authors.forename: Plinio
authors.initials: P
authors.lastname: Innocenzi
authors.forename: Cristiana
authors.initials: C
authors.lastname: Figus
authors.forename: Masahide
authors.initials: M
authors.lastname: Takahashi
authors.forename: Massimo
authors.initials: M
authors.lastname: Piccinini
authors.forename: Luca
authors.initials: L
authors.lastname: Malfatti
mesh_terms: D008567:Membranes, Artificial; D015394:Molecular Structure; D012821:Silanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000295:instrumentation; D013997:Time Factors; D014835:Volatilization
chemical_list: C403136:3-glycidoxypropyltrimethoxysilane; D008567:Membranes, Artificial; D012821:Silanes