Structure and rheology of nanocomposite hydrogels composed of DNA and clay

Taki, Akihiro; John, Baiju; Arakawa, Shuichi; Okamoto, Masami

doi:10.1016/j.eurpolymj.2012.10.013

Cited by 31 publications

(16 citation statements)

References 27 publications

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“…Slope of complex viscosity (η * s) almost decreased with the increase of Laponite from zero to 10 wt.% (-0.79), whereas it increased and reached the highest value of -0.91 in SSG-15%Laponite hydrogel, which was considerably steeper than the maximum amount of -0.76 which used to describe a weak polysaccharide-based gel, formed by overlapping and entangled flexible random coil chains. These results demonstrated a non-Newtonian shear thinning behavior, may be due to the disappearing of the house of cards microstructure and planer alignment of the particle-matrix towards the flow direction under shear force (Dávila & d'Ávila, 2017;Taki, John, Arakawa, & Okamoto, 2013).…”

Section: Frequency Sweepmentioning

confidence: 84%

Novel nanobiocomposite hydrogels based on sage seed gum-laponite: Physico-chemical and rheological characterization

Oleyaei

Razavi

Mikkonen

2018

Carbohydrate Polymers

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In this study, the physico-chemical and rheo-mechanical properties of sage seed gum hydrogel, reinforced by various ratios (0-25 wt.%) of Laponite, were investigated. Particles size measurements indicated the formation of large SSG-Laponite microstructures upon nanoparticle adding, due to the interactions generated between the anionic SSG and the charged surfaces of clay platelets. Laponite affected the surface tension and density of the SSG-based systems significantly, but only influenced the ζ-potential above 20 wt.%. The dynamic rheological behavior of SSG-based nanocomposites reflected the reinforcing effect of secondary structures and percolated three-dimensional network, suggested a structural modification of the hydrogels with the Laponite loading. An improvement in texture profile analysis parameters was observed in Laponite content ≤5 wt.%, whereas for nanoparticles >5 wt.%, a significant decrease was obtained. In conclusion, Laponite improved the rheological and physico-chemical properties of SSG-based hydrogel and extended its potential as promising future bio-products for industrial applications.

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Section: Frequency Sweepmentioning

confidence: 84%

Novel nanobiocomposite hydrogels based on sage seed gum-laponite: Physico-chemical and rheological characterization

Oleyaei

Razavi

Mikkonen

2018

Carbohydrate Polymers

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“…Into the above‐prepared DNA@MWCNT solution, a predetermined amount of the OLO particles was added and subjected to vigorous mixing. The resulting suspension was thermally treated at 90 °C for 6 h to enable the chemical activation of the OLO, in which the thermal treatment temperature was determined based on the melting temperature (=87.5 °C) of DNA. The heat‐treated OLO particles were collected after centrifugation and finally annealed at 800 °C to remove any residues, eventually yielding the chemically activated OLO particles (hereinafter, denoted as D@C–OLO).…”

Section: Resultsmentioning

confidence: 99%

Ecofriendly Chemical Activation of Overlithiated Layered Oxides by DNA‐Wrapped Carbon Nanotubes

Kim

Park

et al. 2020

Advanced Energy Materials

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Despite their exceptionally high capacity, overlithiated layered oxides (OLO) have not yet been practically used in lithium‐ion battery cathodes due to necessary toxic/complex chemical activation processes and unsatisfactory electrochemical reliability. Here, a new class of ecofriendly chemical activation strategy based on amphiphilic deoxyribose nucleic acid (DNA)‐wrapped multiwalled carbon nanotubes (MWCNT) is demonstrated. Hydrophobic aromatic bases of DNA have a good affinity for MWCNT via noncovalent π–π stacking interactions, resulting in core (MWCNT)‐shell (DNA) hybrids (i.e., DNA@MWCNT) featuring the predominant presence of hydrophilic phosphate groups (coupled with Na+) in their outmost layers. Such spatially rearranged Na+–phosphate complexes of the DNA@MWCNT efficiently extract Li+ from monoclinic Li2MnO3 of the OLO through cation exchange reaction of Na+–Li+, thereby forming Li4Mn5O12‐type spinel nanolayers on the OLO surface. The newly formed spinel nanolayers play a crucial role in improving the structural stability of the OLO and suppressing interfacial side reactions with liquid electrolytes, eventually providing significant improvements in the charge/discharge kinetics, cyclability, and thermal stability. This beneficial effect of the DNA@MWCNT‐mediated chemical activation is comprehensively elucidated by an in‐depth structural/electrochemical characterization.

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“…In addition, 5e10 mL of dilute HCl solution was added in each solution and adjusted to the pH 4.0. Millipore Milli Q ultrapure water (18 MU cm, total organic carbon (TOC) < 20 ppb) through dialysis membrane was used without TriseHCl buffer solution for all experiments [25].…”

Section: Adsorption Experimentsmentioning

confidence: 99%