Colloidal stability of model polymer colloids with different functional groups

Need for materials with high biocompatible properties have led to the development of prodrug-decorated nanoparticles. The structure of present nanostructures consists of the hydrophobic core and hydrophilic shell. The shell acts as an external envelop which enhances the colloidal stability of dispersion which protects the prodrug of the nanoparticles from photo- and thermal-initiated degradation. The composite nanoparticles coated by organic shells with functional groups were considered to govern the covalent immobilization of therapeutics/biomolecules. The nanoparticles with unique physiochemical properties may be useful as biosensors in living whole cells. The enhanced cellular drug delivery to cancer cell lines via nanoconjugates revealed that smart nanoparticles are an effective tool for transporting and delivering drugs.

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Correlation of the structural and morphological property of the formation of ZnO nanoparticles using Ricinus Communis extract as a ligand and synthesized through two different precipitating agents

Microscopy and Microanalysis ◽

10.1017/s1431927621011417 ◽

2021 ◽

Vol 27 (S1) ◽

pp. 3316-3319

Author(s):

Nancy Gutiérrez ◽

Dhirendra Kumar Tiwari ◽

Javier Villegas ◽

Francisco Reynoso

Keyword(s):

Crystallite Size ◽

Functional Groups ◽

Zno Nanoparticles ◽

Colloidal Stability ◽

Ricinus Communis ◽

Morphological Property ◽

Natural Extract ◽

Shape Formation ◽

Morphological Behavior

AbstractThe present work defines the structural and morphological behavior of ZnO nanoparticles (ZnONP) synthesized via using Ricinus Communis (Castor) extracts. Two precipitating agents (bases) were used to regulate the pH (10), in presence of this natural extract the determination of structural, morphological and functional groups availability was performed to evaluate the enhancement in crystallite size, shape formation and colloidal stability of the nanoparticle.

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Effects of hydrophobicity-based fractions of Pony Lake fulvic acid on the colloidal stability and dissolution of oppositely charged surface-coated silver nanoparticles

Environmental Chemistry ◽

10.1071/en19178 ◽

2020 ◽

Vol 17 (5) ◽

pp. 400 ◽

Cited By ~ 1

Author(s):

YounJung Jung ◽

Gabriele E. Schaumann ◽

Seungyun Baik ◽

George Metreveli

Keyword(s):

Molecular Weight ◽

Silver Nanoparticles ◽

Organic Matter ◽

Fulvic Acid ◽

Functional Groups ◽

Natural Organic Matter ◽

Colloidal Stability ◽

Coating Materials ◽

Polar Functional Groups ◽

Oppositely Charged

Environmental contextThe fate of silver nanoparticles (AgNPs) in aqueous systems could be influenced by the hydrophobicity of natural organic matter. We observed that the aggregation and dissolution of oppositely charged AgNPs were controlled by the selectivity and dynamics of sorption processes involving the nanoparticle surface and hydrophobic groups on natural organic matter. These findings will be helpful to understand the fate and effects of coated AgNPs in natural systems. AbstractThe fate of silver nanoparticles (AgNPs) released into aquatic environments is significantly affected by natural organic matter (NOM). However, current studies are still insufficient to understand interactions between NOM and AgNPs because they do not explicitly consider the heterogeneity of NOM. We investigated how NOM components with different properties (hydrophobicity, molecular weight, aromaticity, and polarity of functional groups) interact with AgNPs coated with citrate (Cit) and branched polyethylenimine (BPEI) and influence their colloidal stability and dissolution. Pony Lake fulvic acid (PLFA) selected as a model NOM was fractionated into hydrophobic (HPO) and transphilic (TPI) fractions. Sorption of PLFA molecules with a high content of polar functional groups bound to the aromatic rings onto nanoparticles was more favourable in the case of the TPI fraction, which most likely resulted in higher aggregation for both AgNPs and stronger protection of BPEI-AgNPs against dissolution compared with the HPO fraction. Additionally, in contrast to the Cit-AgNPs, resorption of Ag+ ions released from BPEI-AgNPs and/or sorption of Ag+-PLFA complexes to the nanoparticles was most likely a dynamic process, as suggested by the time-dependent changes in the molecular weight of the PLFA fractions sorbed to the BPEI-AgNP surface. These observations suggest that the accessibility of the AgNP surface for the hydrophobicity-based fractions of NOM as well as their colloidal stability and dissolution are controlled by the type and charge of coating materials and by the molecular weight, aromaticity, and content of polar functional groups of NOM.

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