Synthesis and colloidal stability of poly(<i>N</i>‐isopropylacrylamide) microgels with different ionic groups on their surfaces

Zha, Liusheng; Li, Lan; Bao, Laiyan

doi:10.1002/app.25591

Cited by 19 publications

(7 citation statements)

References 18 publications

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“…The zeta potentials (ξ, in mv) and the mobility ([μ/s]/[V/cm]) were calculated from electrophoretic mobility, m, using the Helmholtz-Smoluchowski Eq. (1) [19]:…”

Section: Particle Size and Polydispersity Index Measurement By Phase mentioning

confidence: 99%

Inorganic characterizations and filler particles morphology of self-adhesive cements

D’Alpino

Araújo

González

et al. 2016

International Journal of Adhesion and Adhesives

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a b s t r a c tThis study evaluated the thermal and morphological filler characteristics of self-adhesive resin cements. The cements (Embrace WetBond, MaxCem Elite, Bifix SE, G-Cem, and RelyX U200) were manipulated according to the manufacturers' instructions. Thermogravimetric analysis and differential thermal analysis were performed to obtain the glass transition temperature (T g ) and weight loss. Specimens were also obtained to characterize the zeta potential, the mean particle size and distribution, and the polydispersity by dynamic light scattering. An elemental analysis of the fillers was also conducted using X-ray spectroscopy analysis and micromorphology under SEM. MaxCem Elite contained the least organic matrix, followed by G-Cem, Bifix SE, RelyX U200, and Embrace WetBond. Bifix SE presented the highest T g and G-Cem the lowest. Bifix SE presented the broadest filler size distribution, exhibiting lower zeta potentials and mobility. G-Cem was found to be a highly filler loaded cement with the lowest effective diameter, highest zeta potential and mobility. RelyX U200 presented chromium in the composition and G-Cem presented fluorine. Differences in the nature and chemistry of inorganic fractions seemed to dictate the morphology of the filler content and also the thermal behavior of the materials tested and, may consequently influence the clinical performance of self-adhesive resin cements.

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“…The zeta potentials (ξ, in mv) and the mobility ([μ/s]/[V/cm]) were calculated from electrophoretic mobility, m, using the Helmholtz-Smoluchowski Eq. (1) [19]:…”

Section: Particle Size and Polydispersity Index Measurement By Phase mentioning

confidence: 99%

Inorganic characterizations and filler particles morphology of self-adhesive cements

D’Alpino

Araújo

González

et al. 2016

International Journal of Adhesion and Adhesives

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“…The average size of the Lf particles in solution, the PdI (which measures the heterogeneity of molecule or PS in a solution), and the ZP (colloidal stability) were evaluated by dynamic light scattering (Torres et al, 2017), using a Zetasizer Nano ZS (Malvern Instruments, Malvern, UK). ZP was evaluated to measure the colloidal stability using the Helmholtz-Smoluchowski model (Zha, Li, & Bao, 2007) by determining the electrophoretic mobility of the dispersed particles in the applied electric field.…”

Section: Particle Size (Ps) Polydispersity Index (Pdi) and Zeta Potential (Zp) Of 1% Lf Bark Extract Solutionmentioning

confidence: 99%

Phenolic extract of Libidibia ferrea inhibits dentin endogenous enzymatic activity depending on the adhesive system strategy

Venâncio

Bridi

Teixeira

et al. 2021

Microscopy Res & Technique

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This study evaluated the influence of Libidibia ferrea (Lf) extract used as dentin pretreatment on the resin-dentin bond strength stability and dentin endogenous enzymatic activity. The phytochemical profile (PP) of the Lf extract was evaluated by liquid chromatography; particle size, polydispersity index (PdI), and zeta potential (ZP) were evaluated by dynamic light scattering. The tested groups were ER-Scotchbond Universal (SBU) in the etch-and-rinse (ER) mode; ERLf-SBU in the ER mode + Lf after etching; SE-SBU in the self-etch (SE) mode; and LfSE-Lf before SBU in the SE mode. Sticks were obtained for microtensile bond strength tests and failure mode (24 hr and 12 months). The hybrid layer was evaluated using scanning electron microscopy. The endogenous enzymatic activity of the underlying dentin was analyzed by in situ zymography with the same treatments. The PP showed the presence of quercetin (2.6% w/w). Lf particles were considered large after the analysis of the PdI. The ZP remained stable over time. The ER and ERLf groups had lower bond strength after 12 months, but SE and LfSE remained stable. The predominant failure mode was adhesive for both times. ER and ERLf had longer resin tags and a thicker hybrid layer. The ER and LfSE groups showed higher enzymatic activity than the ERLf and SE groups after 12 months. The Lf extract may contribute to inhibit the dentin endogenous enzymatic activity when associated with an adhesive system in the ER mode.

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“…Colloidal stability was performed as described in previous literature [28]. Briefly, sedimentation behavior of the adhesive containing QPEI-Hap nanoparticles with different concentrations (0.2, 0.5, 1, 2, and 5 wt.…”

Section: Evaluation Of the Experimentally Prepared Adhesive Colloidalmentioning

confidence: 99%

Novel Bifunctional Nanofiller (Bioactive\Antimicrobial) for Improving Dental Adhesives Efficacy

Ibrahim¹

2019

JODH

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Purpose: The objective of this study was to develop novel bio-composite Nanofiller (Quaternary polyethyleneimine\ Hydroxyapatite, QPEI/HAp), which combines the antibacterial activity of polymeric quaternary ammonium salt and the multi-advantages of Hydroxyapatite nanoparticles for improving biological and physico-mechanical properties of Dental Adhesives. Materials and Methods: Hydroxyapatite (HAp) nano rods were produced by hydrothermal process and coated by Polyethyleneimine (PEI) via electrostatic adsorption, followed by two steps polymeric reaction; tertiary amination and quaternization. The resulting powder was characterized using XRD, FTIR and TEM before and after polymer coating, and bioactivity was evaluated after 7 days soaking in simulated body fluid using XRD analysis. An experimental ethanolbased one-bottle adhesive resin was formulated with 0.2, 0.5, 1, 2 and 5% QPEI/HAp nanofiller. The formulated adhesive resins were evaluated for their colloidal stability, antibacterial activity, Ultimate Tensile Strength, and Micro-Shear bond strength to dentin. Results: Powder characterization confirmed successful surface modification of Hydroxyapatite nanoparticles with PEI polymer; the particles presented a high crystallinity with typical chemical groups and mean size around 20 nanometers. XRD analysis revealed nucleation of apatite crystals on the surface of QPEI/HAp nanoparticles after soaking in SBF; confirming their bioactivity. Lower contents of modified nanoparticles showed little or no aggregation tendency and good colloidal stability in the adhesive solution with Zeta potential of 30.6 mV. Antibacterial outcomes of PEI against S. mutans was significantly higher than that of MDPB in Clearfil Protect bond; a commercial adhesive used as control (P<0.05). The addition of 0.2 wt. % modified nano-hydroxyapatite resulted in higher values of Ultimate Tensile and Micro-Shear bond strength than other tested adhesives and commercial Clearfil S3 Bond (all-in-one adhesive); (P<0.05). Conclusion: Incorporation of 0.2 wt. % QPEI-HAp nanoparticles significantly improved the adhesive properties and may be promising multifunctional filler for dental adhesive resin.

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Synthesis and colloidal stability of poly(N‐isopropylacrylamide) microgels with different ionic groups on their surfaces

Cited by 19 publications

References 18 publications

Inorganic characterizations and filler particles morphology of self-adhesive cements

Inorganic characterizations and filler particles morphology of self-adhesive cements

Phenolic extract of Libidibia ferrea inhibits dentin endogenous enzymatic activity depending on the adhesive system strategy

Novel Bifunctional Nanofiller (Bioactive\Antimicrobial) for Improving Dental Adhesives Efficacy

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