Swelling-induced modulation of static and dynamic fluctuations in polyacrylamide gels observed by scanning microscopic light scattering

Furukawa, Hidemitsu; Horie, Kazuyuki; Nozaki, R.; Okada, Mamoru

doi:10.1103/physreve.68.031406

Cited by 129 publications

(126 citation statements)

References 15 publications

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“…The dissipation of loads was assessed with shear measurements, from which the complex shear modulus |G ⁄ | and the angle d were calculated. Generally, the dynamic mechanical properties of a hydrogel depend on the density of the polymer chains, the friction between the chains and the homogeneity of the intrinsic network structure [41,42]. Incorporation of NFC not only increases the friction, but also increases the value of d, thus leading to higher complex dynamic moduli and therefore increased load dissipation of composite hydrogels.…”

Section: Discussionmentioning

confidence: 99%

Nanofibrillated cellulose composite hydrogel for the replacement of the nucleus pulposus

Borges¹,

Eyholzer²,

Duc³

et al. 2011

Acta Biomaterialia

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a b s t r a c tThe swelling and compressive mechanical behavior as well as the morphology and biocompatibility of composite hydrogels based on Tween Ò 20 trimethacrylate (T3), N-vinyl-2-pyrrolidone (NVP) and nanofibrillated cellulose (NFC) were assessed in the present study. The chemical structure of T3 was verified by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the degree of substitution was found to be around 3. Swelling ratios of neat hydrogels composed of different concentrations of T3 and NVP were found to range from 1.5 to 5.7 with decreasing concentration of T3. Various concentrations of cellulose nanofibrils (0.2-1.6 wt.%) were then used to produce composite hydrogels that showed lower swelling ratios than neat ones for a given T3 concentration. Neat and composite hydrogels exhibited a typical nonlinear response under compression. All composite hydrogels showed an increase in elastic modulus compared to neat hydrogel of about 3-to 8-fold, reaching 18 kPa at 0% strain and 62 kPa at 20% strain for the hydrogel with the highest NFC content. All hydrogels presented a porous and homogeneous structure, with interconnected pore cells of around 100 nm in diameter. The hydrogels are biocompatible. The results of this study demonstrate that composite hydrogels reinforced with NFC may be viable as nucleus pulposus implants due to their adequate swelling ratio, which may restore the annulus fibrosus loading, and their increased mechanical properties, which could possibly restore the height of the intervertebral discs.

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Section: Discussionmentioning

confidence: 99%

Nanofibrillated cellulose composite hydrogel for the replacement of the nucleus pulposus

Borges¹,

Eyholzer²,

Duc³

et al. 2011

Acta Biomaterialia

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“…Note that ∆n here is defined as ∆n = n − n ⊥ with the optic axis being parallel ( ) to the direction of the magnetic field. Figure 2 Scanning measurement was performed at 31 points for each sample to determine the dynamic component of the ensemble-averaged dynamic structure factor ∆g (1) en (τ ) [13]. The determined correlation function was transformed to the distribution function of relaxation time, P (τ R ), numerically transformed to relaxationtime distribution composed of one or two logarithmic Gaussian distribution (LGD) [14].…”

Section: Methods Of Birefringence Measurementmentioning

confidence: 99%

Structural anisotropy of silica hydrogels prepared under magnetic field

2008

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Birefringence measurements have been carried out on the Pb-doped silica hydrogels prepared under various magnetic fields up to 5T. The silica gels prepared at 5T were used as a medium of crystal growth of PbBr2, whose result implied the structural anisotropy; an aligned array of crystallites was obtained by transmission electron microscopy. While the samples prepared at 0, 1, and 3T have no birefringence, we found that the samples have negative birefringence on the order of magnitude 10 −6 as if the direction of the magnetic field is the optic axis of a uniaxal crystal. To the authors' knowledge, the birefringent silica hydrogels were obtained by gelation under magnetic field for the first time. Also, scanning microscopic light scattering experiments have been performed. The results indicate that the characteristic length distribution for birefringent samples is narrower than that for non-birefringent ones.

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“…Quantitative determination of minute mesh size of the gels was performed with the scanning microscopic light scattering (SMILS) system (Furukawa et al, 2003, which was developed for the detailed characterization of network structure in polymer gels. The SMILS system enables us to scan and measure the light scattering at many different positions in a gel, in order to rigorously determine a time-and space-averaged, i.e.…”

Section: Measurementsmentioning

confidence: 99%

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

Naga¹,

Uchiyama²,

Takahashi³

et al. 2016

IJC

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Semi-interpenetrating polymer network (semi-IPN) gels have been synthesized using a hydrosilylation reaction of 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS) as a joint molecule, and ,-nonconjugated dienes, 1,5-hexadiene (HD) or 1,9-decadiene (DD) as linker molecules in the presence of polystyrene (PS) as a liner polymers in toluene or cyclohexane. Network structure, mesh size and mesh size distribution, of the resulting semi-IPN gels was quantitatively characterized by means of a scanning microscopic light scattering (SMILS). The relaxation peaks derived from three kinds of structures were detected in the semi-IPN gels prepared in toluene by the SMILS analysis. One was derived from the mesh formed by TMCTS/,-nonconjugated dienes about 1-2 nm. Others were derived from transition networks about 20-150 nm and large clustered liner polymer chains about 700-2300 nm. Effect of concentration and molecular weight of the liner polymer on the network structure of the semi-IPN gels in toluene was investigated. The relaxation peaks derived from transition networks or random coils formed by aggregated PS chains were detected in the semi-IPN gels containing high concentration or high molecular weight PS. The semi-IPN gels containing PS were also prepared in cyclohexane as a poor solvent for PS at 40º C, which was a higher temperature than the upper critical solution temperature (UCST = 34º C) of PS in cyclohexane. The network structure of the semi-IPN gels was traced by SMILS on the cooling process. In the semi-IPN gel with the short linker molecule of HD, the relaxation peak derived from clustered PS chains was detected over the UCST. By contrast, the relaxation peak derived from transition network was observed in the semi-IPN gel with the long linker molecule of DD.

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Swelling-induced modulation of static and dynamic fluctuations in polyacrylamide gels observed by scanning microscopic light scattering

Cited by 129 publications

References 15 publications

Nanofibrillated cellulose composite hydrogel for the replacement of the nucleus pulposus

Nanofibrillated cellulose composite hydrogel for the replacement of the nucleus pulposus

Structural anisotropy of silica hydrogels prepared under magnetic field

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

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