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Katana B, Baptista J, Schneider R, de Oliveira RJ, Szilágyi I. The Impact of Polyphosphates on the Colloidal Stability of Laponite Particles. J Phys Chem B 2024; 128:6957-6965. [PMID: 38980009 PMCID: PMC11264265 DOI: 10.1021/acs.jpcb.4c03193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 07/01/2024] [Accepted: 07/03/2024] [Indexed: 07/10/2024]
Abstract
The effect of polyphosphate (polyP) adsorption on the colloidal properties of disc-shaped laponite (LRD) particles was examined in aqueous dispersions with a focus on elucidating the interparticle forces that govern the colloidal stability of the systems. The charge and aggregation rate data of bare LRD exhibited an ionic strength-dependent trend, confirming the presence of double-layer repulsion and van der Waals attraction as major surface interactions. The charge of LRD particles significantly increased in magnitude at elevated polyP concentrations as a result of polyP adsorption and subsequent overcharging of the positively charged sites on the edges of the LRD discs. A transition from stable to unstable LRD colloids was observed with increasing polyP doses indicating the formation of aggregates in the latter systems due to depletion forces and/or bridging interactions induced by dissolved or adsorbed polyP, respectively. The degree of phosphate polymerization influenced neither the charge nor the aggregation mechanism. The findings clearly confirm that polyP adsorption was the driving phenomenon to induce particle aggregation in contrast to other clay types, where phosphate derivatives act as dispersion stabilizing agents. This study provides valuable insights into the early stages of aggregation in colloidal systems involving LRD and polyPs, which have a crucial role in predicting further material properties that are important to designing LRD-polyP composites for applications such as potential phosphate sources in chemical fertilizers.
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Affiliation(s)
- Bojana Katana
- MTA-SZTE
Momentum Biocolloids Research Group, Department of Physical Chemistry
and Materials Science, Interdisciplinary Centre of Excellence, University of Szeged, 6720 Szeged, Hungary
| | - João Baptista
- Group
of Polymers and Nanostructures, Federal
Technological University of Paraná − UTFPR, 85902-490 Toledo, Paraná, Brazil
- Chemical
Engineering, University of São Paulo
− USP, 05508-800 São Paulo, Brazil
| | - Ricardo Schneider
- Group
of Polymers and Nanostructures, Federal
Technological University of Paraná − UTFPR, 85902-490 Toledo, Paraná, Brazil
| | - Rodrigo José de Oliveira
- Physical
Chemistry of Materials Group, State University
of Paraíba − UEPB, 58429-500 Campina Grande, Paraíba, Brazil
| | - István Szilágyi
- MTA-SZTE
Momentum Biocolloids Research Group, Department of Physical Chemistry
and Materials Science, Interdisciplinary Centre of Excellence, University of Szeged, 6720 Szeged, Hungary
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Saracini J, de Assis ICM, Peiter GC, Busso C, de Oliveira RJ, Felix JF, Bini RA, Schneider R. Borophosphate glasses as active agents for antimicrobial hydrogels. Int J Pharm 2023; 644:123323. [PMID: 37597596 DOI: 10.1016/j.ijpharm.2023.123323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 08/11/2023] [Accepted: 08/14/2023] [Indexed: 08/21/2023]
Abstract
Herein we report the synthesis of transition-metal-free potassium borophosphate glasses and their application as bactericidal and bacteriostatic material. The antimicrobial activity was achieved through a simple change in the molar ratio of boron and phosphorus atoms, making borophosphate glass soluble in water. The glasses were analyzed by X-ray powder diffraction, Raman spectroscopy, laser-induced breakdown spectroscopy, and water absorption. The addition of a boron compound is required to obtain potassium-based phosphate glasses. Moreover, the change in the phosphorus and boron molar ratio (P/B), 2, 1 or 0.5 affects the glass solubilization in water, which increases with the phosphorus content. The glass materials were submitted to tests of biological activity against the bacteria Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. These water-soluble borophosphate glasses were employed in the development of hydrogel formulations using Carbopol®. Phosphorous-rich samples at a concentration of 15 % (w/w) in hydrogel showed better antimicrobial activity against S. aureus and E. coli, when compared to other samples, including commercial alcohol hand sanitizer gel, with an average size of the inhibition halo of 24.02±1.43 and 19.24±1.63mm, respectively.
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Affiliation(s)
- Jaqueline Saracini
- Universidade Estadual do Oeste do Paraná, Centro de Engenharias e Ciências Exatas-CECE, 85903-000, Toledo, PR, Brazil
| | - Iago C M de Assis
- Federal University of Technology - Paraná, Group of Polymers and Nanostructures, 85902-490, Toledo, PR, Brazil
| | - Gabrielle Caroline Peiter
- Federal University of Technology - Paraná, Group of Polymers and Nanostructures, 85902-490, Toledo, PR, Brazil
| | - Cleverson Busso
- Federal University of Technology - Paraná, Group of Polymers and Nanostructures, 85902-490, Toledo, PR, Brazil
| | - Rodrigo J de Oliveira
- Universidade Estadual da Paraíba, Physical Chemistry of Materials Group, 58429-500, Campina Grande, PB, Brazil
| | - Jorlandio F Felix
- Universidade de Brasília, Instituto de Física-Núcleo de Física Aplicada, 70910-900, Brasília, DF, Brazil
| | - Rafael A Bini
- Federal University of Technology - Paraná, Group of Polymers and Nanostructures, 85902-490, Toledo, PR, Brazil
| | - Ricardo Schneider
- Universidade Estadual do Oeste do Paraná, Centro de Engenharias e Ciências Exatas-CECE, 85903-000, Toledo, PR, Brazil; Federal University of Technology - Paraná, Group of Polymers and Nanostructures, 85902-490, Toledo, PR, Brazil.
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Bujok S, Konefał M, Konefał R, Nevoralová M, Bednarz S, Mielczarek K, Beneš H. Insight into the aqueous Laponite® nanodispersions for self-assembled poly(itaconic acid) nanocomposite hydrogels: The effect of multivalent phosphate dispersants. J Colloid Interface Sci 2021; 610:1-12. [PMID: 34922067 DOI: 10.1016/j.jcis.2021.12.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/31/2021] [Accepted: 12/08/2021] [Indexed: 10/19/2022]
Abstract
HYPOTHESIS We hypothesize, that physical network between Laponite® nanoparticles and high molecular weight polyelectrolyte formed by mixing of Laponite® nanodispersion (containing multivalent phosphate dispersant) and polyelectrolyte solution is strongly influenced by the type and content of dispersant, which forms electric double layer (EDL) closely to the Laponite® edges. Thus, optimum dispersant concentration is necessary to overcome clay-clay interactions (excellent clay delamination), but should not be exceeded, what would result in the EDL compression and weakening of attractions forming clay-polyelectrolyte network. Thus, deeper investigation of Laponite® nanodispersions is highly demanded since it would enable to better design the self-assembled clay-polyelectrolyte hydrogels. EXPERIMENTS To study clay interparticle interactions in the presence of various multivalent phosphates, complementary methods providing wide nanodispersion characterization have been applied: zeta potential measurement and SAXS technique (electrostatic interactions), oscillatory rheology (nanodispersion physical state) and NMR experiments (ion immobilization degree). FINDINGS It was found that multivalent phosphates induce and tune strength of clay-polyelectrolyte interactions forming hydrogel network in terms of varying EDL on the Laponite® edges. Moreover, phosphate dispersing efficiency depends on the molecular size, chemical structure, and valence of the anion; its potential as efficient dispersant for hydrogel preparation can be evaluated by estimation of anion charge density.
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Affiliation(s)
- Sonia Bujok
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic.
| | - Magdalena Konefał
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
| | - Rafał Konefał
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
| | - Martina Nevoralová
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
| | - Szczepan Bednarz
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, Cracow 31-155, Poland
| | - Kacper Mielczarek
- Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, Cracow 31-155, Poland
| | - Hynek Beneš
- Institute of Macromolecular Chemistry, CAS, Heyrovského nám. 2, Prague 6 162 06, Czech Republic
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