Optical and morphological characterization of polyacrylamide hydrogel and liquid crystal systems

Aouada, Fauze A.; Moura, Márcia R. de; Fernandes, P. R. G.; Rubira, Adley F.; Muniz, Edvani C.

doi:10.1016/j.eurpolymj.2005.03.020

Cited by 57 publications

(23 citation statements)

References 29 publications

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“…Hydrogels were freeze dried at −80°C to maintain the porous structure without any collapse. 27, 28 After 48 h lyophilization, the dried sample was deposited onto an aluminum stub and sputter‐coated with gold for 60 s to enhance conductivity.…”

Section: Methodsmentioning

confidence: 99%

Preparation and characterization of hydrophilic, spectroscopic, and kinetic properties of hydrogels based on polyacrylamide and methylcellulose polysaccharide

Aouada

Moura

Silva

et al. 2011

J of Applied Polymer Sci

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Hydrogels with potential technological applications has been prepared using polyacrylamide (PAAm) and methylcellulose (MC) polymers by free radical polymerization reaction. The spectroscopic, morphological, swelling, and kinetic properties were investigated by solid state 13 C VACP-MAS nuclear magnetic resonance (NMR), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), water uptake (WU) measurements, respectively. FTIR and NMR analysis confirmed the formation of semi-IPN structured hydrogel. Data from WU and SEM revealed that the addition of MC into the solutionforming hydrogel leads to increase in average pore size and hydrophilicity. By varying of AAm, MC, pH and ionicstrength of swelling medium, it was possible to obtain hydrogels with hydrophilic properties controlled and optimized. The water uptake mechanism is dependent of the AAm concentration, which can follow the Fickian diffusion and anomalous transport process. In this way, PAAm-MC hydrogels are promising materials for technological applications, such as agricultural field. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 120: 3004-3013, 2011

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Section: Methodsmentioning

confidence: 99%

Preparation and characterization of hydrophilic, spectroscopic, and kinetic properties of hydrogels based on polyacrylamide and methylcellulose polysaccharide

Aouada

Moura

Silva

et al. 2011

J of Applied Polymer Sci

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“…Magnification in SEM can be controlled over a range of up to 6 orders of magnitude from about 10 to 500,000 times. This is a powerful technique widely used to capture the characteristic 'network' structure in hydrogels (Aikawa et al, 1998;Aouada et al, 2005;El Fray et al, 2007;Pourjavadi & Kurdtabar, 2007).…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Hydrogels: Methods of Preparation, Characterisation and Applications

Gulrez¹,

Al-Assaf²,

Phillips³

2011

Progress in Molecular and Environmental Bioengineering - From Analysis and Modeling to Technology Applications

258

178

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“…9,10 This is mainly due to the unique properties of the water solvent and due to the dynamics processes occurring in the system that entails motions of specific chemical groups of the polymer, water diffusion and matrix-solvent interactions. For example, Scanning Electron Microscopy (SEM) has been widely used to capture images of the characteristic network structure in hydrogels, 11,12 while Infrared spectroscopy and Light Scattering techniques have been implemented for investigating the structural arrangement in hydrogels 13 and to determine the molecular distribution and parameters of the polymer matrix. The detailed explanation of the structure and dynamics of hydrogel systems thus requires the combination of different and complementary physical methods suitable for the exploration of such different time and distance domains.…”

Section: Introductionmentioning

confidence: 99%

Water and polymer dynamics in a model polysaccharide hydrogel: the role of hydrophobic/hydrophilic balance

Rossi

Venuti

D’Amico

et al. 2015

Phys. Chem. Chem. Phys.

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The molecular dynamics of water and a polymer matrix is here explored in a paradigmatic model of a polysaccharide hydrogel, by the combined use of UV Raman scattering and infrared measurements. The case example of cyclodextrin nanosponges (CDNS)/hydrogel is chosen since the simultaneous presence in the structure of the polymer matrix of both hydrophilic and hydrophobic sites mimics the complexity of polysaccharide hydrogels. In this way, the contributions provided by the balance between the hydrophilicity/hydrophobicity and the grade of entanglement of the polymer hydrogel to lead to the formation of the gel phase are separately accounted and evaluated. As main results, we found that the hydrophobic CH groups inserted on the aromatic ring of CDNS experience a more pronounced dynamic perturbation with respect to the carbonyl groups due to the collision between the solvent and vibrating atoms of the polymer. The overall results provide a detailed molecular picture of the swelling phenomena occurring when a chemically cross-linked polymer contacts with water or biological fluids and exploits the potentiality of UV Raman spectroscopy to retrieve dynamic information besides their structural counterpart obtained by the classical analysis of the basic features of vibrational spectra.

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Optical and morphological characterization of polyacrylamide hydrogel and liquid crystal systems

Cited by 57 publications

References 29 publications

Preparation and characterization of hydrophilic, spectroscopic, and kinetic properties of hydrogels based on polyacrylamide and methylcellulose polysaccharide

Preparation and characterization of hydrophilic, spectroscopic, and kinetic properties of hydrogels based on polyacrylamide and methylcellulose polysaccharide

Hydrogels: Methods of Preparation, Characterisation and Applications

Water and polymer dynamics in a model polysaccharide hydrogel: the role of hydrophobic/hydrophilic balance

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