Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4975
Título: From cellulosic based liquid crystalline sheared solutions to 1D and 2D soft materials
Autor: Godinho, Maria Helena
Almeida, Pedro Lúcio Maia Marques de
Figueirinhas, João Luís
Palavras-chave: Cellulose-Based Liquid Crystals
Films
Fibers
Nuclear Magnetic Resonance (NMR)
Electro-Optical Characteristics
Data: Jun-2014
Editora: MDPI AG
Citação: GODINHO, Maria Helena; ALMEIDA, Pedro Lúcio Maia Marques de; FIGUEIRINHAS, João Luís – From cellulosic based liquid crystalline sheared solutions to 1D and 2D soft materials. Materials. ISSN: 1996-1944. Vol. 7, nr. 6 (2014), pp. 4601-4627
Resumo: Liquid crystalline cellulosic-based solutions described by distinctive properties are at the origin of different kinds of multifunctional materials with unique characteristics. These solutions can form chiral nematic phases at rest, with tuneable photonic behavior, and exhibit a complex behavior associated with the onset of a network of director field defects under shear. Techniques, such as Nuclear Magnetic Resonance (NMR), Rheology coupled with NMR (Rheo-NMR), rheology, optical methods, Magnetic Resonance Imaging (MRI), Wide Angle X-rays Scattering (WAXS), were extensively used to enlighten the liquid crystalline characteristics of these cellulosic solutions. Cellulosic films produced by shear casting and fibers by electrospinning, from these liquid crystalline solutions, have regained wider attention due to recognition of their innovative properties associated to their biocompatibility. Electrospun membranes composed by helical and spiral shape fibers allow the achievement of large surface areas, leading to the improvement of the performance of this kind of systems. The moisture response, light modulated, wettability and the capability of orienting protein and cellulose crystals, opened a wide range of new applications to the shear casted films. Characterization by NMR, X-rays, tensile tests, AFM, and optical methods allowed detailed characterization of those soft cellulosic materials. In this work, special attention will be given to recent developments, including, among others, a moisture driven cellulosic motor and electro-optical devices.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4975
DOI: 10.3390/ma7064601
ISSN: 1996-1944
Aparece nas colecções:ISEL - Física - Artigos

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