Dielectric relaxation anomalies in polyacrylic acid and their relationship with “critical” points of water

Gavrilova, N. D.; Malyshkina, I. A.; Махаева, Е. Е.; Novik, V. K.; Vorobiev, A.

doi:10.1080/00150193.2016.1238284

Cited by 7 publications

(1 citation statement)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure b,c shows the DSC thermograms of PAA, PAA/HA, and PAA/functionalized-HA hydrogels (HG) evaluated at pH = 7.4 and 4.1. All thermograms exhibit three characteristic regions ascribed to the following transitions: − (A) water, melting transition, T m ; (B) water, evaporation transition, T e ; and (C) polymer, glass transition ( T g ). After deconvolution, the identified regions turned out to be the sum of several peaks representing different phase switches; thermodynamic parameters are summarized in Table S2.…”

Section: Resultsmentioning

confidence: 99%

Hydroxyapatite Nanoparticle Mesogens: Morphogenesis of pH-Sensitive Macromolecular Liquid Crystals

Benedini

Moglie

Ruso

et al. 2021

Crystal Growth & Design

View full text Add to dashboard Cite

Numerous living structural materials display self-assembly of building blocks. Biological molecular networks exhibit lyotropic liquid crystalline properties that can support non-equilibrium pathways influenced by dynamic processes at the microscale. With the aim of taking a further step toward the conquest of a biomimetic material to apply in calcified tissue regeneration, in this work, we have evaluated the chemical grafting of phosphorous amide (C–N–P) and α-amino phosphonate (N–C–P) molecular fragments on previously created biomimetic hydroxyapatite (HA) nanoparticles (nano-HA). Molecular combinations were selected due to their recognized capability of influencing bone physiology and pathology. We have assessed the effect of the type and degree of nano-HA substitution over the spontaneous self-association of acidic macromolecules that respond to pH stimulation. The produced materials were inspected by Fourier transform infrared and solid-state nuclear magnetic resonance spectroscopy, small-angle X-ray scattering, powder X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, and polarized light and high-resolution electron transmission microscopy. A complete analysis of the experimental data proved that under specific synthetic conditions, it is possible to obtain substituted-HA nanoparticles that are able to act as mesogenic agents. These systems that dynamically respond to pH can be tailored in vitro to induce, at concentration values analogous to biogenic ones, lyotropic liquid crystal organization on acid macromolecules.

show abstract

Section: Resultsmentioning

confidence: 99%