2020
Dulski, M.; Dudek, K.; Podwórny, J.; Sułowicz, S.; Piotrowska-Seget, Z.; Malarz, K.; Mrozek-Wilczkiewicz, A.; Wolnica, K.; Matus, K.; Peszke, J.; Nowak, A.
Impact of temperature on the physicochemical, structural and biological features of copper-silica nanocomposites Journal Article
In: Materials Science and Engineering C, vol. 107, 2020, ISSN: 09284931, (1).
@article{2-s2.0-85074128230,
title = {Impact of temperature on the physicochemical, structural and biological features of copper-silica nanocomposites},
author = { M. Dulski and K. Dudek and J. Podwórny and S. Sułowicz and Z. Piotrowska-Seget and K. Malarz and A. Mrozek-Wilczkiewicz and K. Wolnica and K. Matus and J. Peszke and A. Nowak},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074128230&doi=10.1016%2fj.msec.2019.110274&partnerID=40&md5=4ca0bcc3c03e0a4eaa660bc1dbe57b03},
doi = {10.1016/j.msec.2019.110274},
issn = {09284931},
year = {2020},
date = {2020-01-01},
journal = {Materials Science and Engineering C},
volume = {107},
publisher = {Elsevier Ltd},
abstract = {Classical wet chemical synthesis was used to fabricate a hybrid composite that contained copper nanoparticles (average size ∼1 nm), which were embedded into a silicon oxide carrier. The structural and chemical alternations in the copper-functionalized silica were investigated in systems that were sintered at 573 K, 873 K, 1173 K, and 1473 K. A general trend, which was associated with the transformation of metallic copper with a cubic structure into copper(II) oxide with a monoclinic structure in the heat-treated systems, was found. XPS and FTIR spectroscopies also revealed the presence of copper(I) oxide, which formed a shell around the CuO. SEM and TEM showed gradual densification of the hybrid system at ever higher sintering temperatures, which corresponded with the gradual copper agglomeration. A temperature of 873 K was determined to be the temperature at which amorphous silica was transformed into cristoballite and tridymite, as well as the formation of a bulk-like copper structure. In relation to the physicochemical and structural data, high antimicrobial features that had a relatively low toxicity effect on the normal human fibroblasts (NHDF) below 250 mg/L was found for the initial copper-silica composite and the samples that were sintered at 573 K. In turn, a significant decrease in the biological impact was observed in the samples that were sintered at temperatures above 573 K. As a result, the paper discusses the model of structural modifications in copper-silica nanocomposite concerning their biological impact that was developed. © 2019 Elsevier B.V.},
note = {1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Classical wet chemical synthesis was used to fabricate a hybrid composite that contained copper nanoparticles (average size ∼1 nm), which were embedded into a silicon oxide carrier. The structural and chemical alternations in the copper-functionalized silica were investigated in systems that were sintered at 573 K, 873 K, 1173 K, and 1473 K. A general trend, which was associated with the transformation of metallic copper with a cubic structure into copper(II) oxide with a monoclinic structure in the heat-treated systems, was found. XPS and FTIR spectroscopies also revealed the presence of copper(I) oxide, which formed a shell around the CuO. SEM and TEM showed gradual densification of the hybrid system at ever higher sintering temperatures, which corresponded with the gradual copper agglomeration. A temperature of 873 K was determined to be the temperature at which amorphous silica was transformed into cristoballite and tridymite, as well as the formation of a bulk-like copper structure. In relation to the physicochemical and structural data, high antimicrobial features that had a relatively low toxicity effect on the normal human fibroblasts (NHDF) below 250 mg/L was found for the initial copper-silica composite and the samples that were sintered at 573 K. In turn, a significant decrease in the biological impact was observed in the samples that were sintered at temperatures above 573 K. As a result, the paper discusses the model of structural modifications in copper-silica nanocomposite concerning their biological impact that was developed. © 2019 Elsevier B.V.
2019
Dulski, M.; Peszke, J.; Włodarczyk, J.; Sułowicz, S.; Piotrowska-Seget, Z.; Dudek, K.; Podwórny, J.; Malarz, K.; Mrozek-Wilczkiewicz, A.; Zubko, M.; Nowak, A.
Physicochemical and structural features of heat treated silver-silica nanocomposite and their impact on biological properties Journal Article
In: Materials Science and Engineering C, vol. 103, 2019, ISSN: 09284931, (7).
@article{2-s2.0-85066952395,
title = {Physicochemical and structural features of heat treated silver-silica nanocomposite and their impact on biological properties},
author = { M. Dulski and J. Peszke and J. Włodarczyk and S. Sułowicz and Z. Piotrowska-Seget and K. Dudek and J. Podwórny and K. Malarz and A. Mrozek-Wilczkiewicz and M. Zubko and A. Nowak},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066952395&doi=10.1016%2fj.msec.2019.109790&partnerID=40&md5=fff97a32db51f403cd8ec9a6905fae62},
doi = {10.1016/j.msec.2019.109790},
issn = {09284931},
year = {2019},
date = {2019-01-01},
journal = {Materials Science and Engineering C},
volume = {103},
publisher = {Elsevier Ltd},
abstract = {In the last few decades, many nanostructures with varying properties and possible applications have been developed. These materials have been intended to work in various environmental temperature conditions. In this context, the main challenge has been to comprehend the impact of synergic interaction between individual elements included in non-annealed materials in relation to systems subjected to temperature impact. Another problem has corresponded to the impact of thermal modification on organisms such as bacteria and human cells. Such problems can be solved by the fabrication of a nanocomposite with mono-dispersed 8 nm silver (Ag0 or Ag+) embedded into a silica carrier, followed by the analysis of the impact of heat treatment under various temperature conditions on its physicochemical features. Therefore, methodical studies reported in this text have shown an increase of silver particle size up to 170 nm, a decrease of its concentration, as well as the formation of sub-nanometer Ag+ and/or Ag2+ clusters as the temperature rises to 1173 K. In turn, the structurally disordered silica carrier had been entirely transformed to cristobalite and tridymite only at 1473 K as well as partial reduction of Ag2+ to Ag+. Simultaneously, inhibition of growth of Gram-positive and Gram-negative bacteria, as well as an increase in cytotoxicity towards human cells was observed as the temperature rose. As a final point, for the first time, a “pseudo” phase diagram of the structural alterations in the Ag/SiO2 nanocomposite has been created, as well as a model of silver-silica transformation to biological systems has been developed. © 2019 Elsevier B.V.},
note = {7},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the last few decades, many nanostructures with varying properties and possible applications have been developed. These materials have been intended to work in various environmental temperature conditions. In this context, the main challenge has been to comprehend the impact of synergic interaction between individual elements included in non-annealed materials in relation to systems subjected to temperature impact. Another problem has corresponded to the impact of thermal modification on organisms such as bacteria and human cells. Such problems can be solved by the fabrication of a nanocomposite with mono-dispersed 8 nm silver (Ag0 or Ag+) embedded into a silica carrier, followed by the analysis of the impact of heat treatment under various temperature conditions on its physicochemical features. Therefore, methodical studies reported in this text have shown an increase of silver particle size up to 170 nm, a decrease of its concentration, as well as the formation of sub-nanometer Ag+ and/or Ag2+ clusters as the temperature rises to 1173 K. In turn, the structurally disordered silica carrier had been entirely transformed to cristobalite and tridymite only at 1473 K as well as partial reduction of Ag2+ to Ag+. Simultaneously, inhibition of growth of Gram-positive and Gram-negative bacteria, as well as an increase in cytotoxicity towards human cells was observed as the temperature rose. As a final point, for the first time, a “pseudo” phase diagram of the structural alterations in the Ag/SiO2 nanocomposite has been created, as well as a model of silver-silica transformation to biological systems has been developed. © 2019 Elsevier B.V.
2017
Peszke, J.; Dulski, M.; Nowak, A.; Balin, K.; Zubko, M.; Sułowicz, S.; Nowak, B.; Piotrowska-Seget, Z.; Talik, E.; Wojtyniak, M.; Mrozek-Wilczkiewicz, A.; Malarz, K.; Szade, J.
Unique properties of silver and copper silica-based nanocomposites as antimicrobial agents Journal Article
In: RSC Advances, vol. 7, no. 45, pp. 28092-28104, 2017, ISSN: 20462069, (32).
@article{2-s2.0-85021678961,
title = {Unique properties of silver and copper silica-based nanocomposites as antimicrobial agents},
author = { J. Peszke and M. Dulski and A. Nowak and K. Balin and M. Zubko and S. Sułowicz and B. Nowak and Z. Piotrowska-Seget and E. Talik and M. Wojtyniak and A. Mrozek-Wilczkiewicz and K. Malarz and J. Szade},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85021678961&doi=10.1039%2fc7ra00720e&partnerID=40&md5=6c05b26f09aa8376a25c5d4cf449157d},
doi = {10.1039/c7ra00720e},
issn = {20462069},
year = {2017},
date = {2017-01-01},
journal = {RSC Advances},
volume = {7},
number = {45},
pages = {28092-28104},
publisher = {Royal Society of Chemistry},
abstract = {The paper reports a new route for the fabrication and determination of physicochemical properties and biological activity, of metallic silica-based nanostructure (Ag/SiO2; Cu/SiO2). A research studies shows mono-dispersed nanoparticles in silica matrix with an average size of 12 nm for silver, as well as 12 nm and 4 nm, respectively for copper in hydrophobic and hydrophilic silica composites. The chemical analysis highlights metallic silver and copper ions heterogeneously distributed in the composite as well as metallic oxides such as Ag2O, Cu2O and CuO in hydrophobic system, and CuO in hydrophilic one. Structural research evidences the presence of amorphous, stoichiometric and non-stoichiometric crystalline phase of silica. Biological studies reveal potentially inhibition of growth gram-positive and gram-negative bacteria as well as microscopic fungi. The size of metal nanoparticles and level of silica hydrophobicity show the highest inhibition bacterial growth for hydrophilic system with embedding inside them, 4 nm in size copper nanoparticles. Finally, cytotoxic interaction against human cells with respect to silver and copper silica-based nanocomposites was not found. © 2017 The Royal Society of Chemistry.},
note = {32},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The paper reports a new route for the fabrication and determination of physicochemical properties and biological activity, of metallic silica-based nanostructure (Ag/SiO2; Cu/SiO2). A research studies shows mono-dispersed nanoparticles in silica matrix with an average size of 12 nm for silver, as well as 12 nm and 4 nm, respectively for copper in hydrophobic and hydrophilic silica composites. The chemical analysis highlights metallic silver and copper ions heterogeneously distributed in the composite as well as metallic oxides such as Ag2O, Cu2O and CuO in hydrophobic system, and CuO in hydrophilic one. Structural research evidences the presence of amorphous, stoichiometric and non-stoichiometric crystalline phase of silica. Biological studies reveal potentially inhibition of growth gram-positive and gram-negative bacteria as well as microscopic fungi. The size of metal nanoparticles and level of silica hydrophobicity show the highest inhibition bacterial growth for hydrophilic system with embedding inside them, 4 nm in size copper nanoparticles. Finally, cytotoxic interaction against human cells with respect to silver and copper silica-based nanocomposites was not found. © 2017 The Royal Society of Chemistry.
2016
Nowak, A.; Szade, J.; Talik, E.; Zubko, M.; Wasilkowski, D.; Dulski, M.; Balin, K.; Mrozik, A.; Peszke, J.
Physicochemical and antibacterial characterization of ionocity Ag/Cu powder nanoparticles Journal Article
In: Materials Characterization, vol. 117, pp. 9-16, 2016, ISSN: 10445803, (30).
@article{2-s2.0-84966710974,
title = {Physicochemical and antibacterial characterization of ionocity Ag/Cu powder nanoparticles},
author = { A. Nowak and J. Szade and E. Talik and M. Zubko and D. Wasilkowski and M. Dulski and K. Balin and A. Mrozik and J. Peszke},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84966710974&doi=10.1016%2fj.matchar.2016.04.013&partnerID=40&md5=d90b94a6c2c0df2f772f2a0d0e5d58ff},
doi = {10.1016/j.matchar.2016.04.013},
issn = {10445803},
year = {2016},
date = {2016-01-01},
journal = {Materials Characterization},
volume = {117},
pages = {9-16},
publisher = {Elsevier Inc.},
abstract = {Metal ion in bimetallic nanoparticles has shown vast potential in a variety of applications. In this paper we show the results of physical and chemical investigations of powder Ag/Cu nanoparticles obtained by chemical synthesis. Transmission electron microscopy (TEM) experiment indicated the presence of bimetallic nanoparticles in the agglomerated form. The average size of silver and copper nanoparticles is 17.1(4) nm (Ag) and 28.9(2) nm (Cu) basing on the X-ray diffraction (XRD) data. X-ray photoelectron (XPS) and Raman spectroscopies revealed the existence of metallic silver and copper as well as Cu2O and CuO being a part of the nanoparticles. Moreover, UV-Vis spectroscopy showed surface alloy of Ag and Cu while Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS) and Energy Dispersive X-ray Spectroscopy (EDX) showed heterogeneously distributed Ag structures placed on spherical Cu nanoparticles. The tests of antibacterial activity show promising killing/inhibiting growth behaviour for Gram positive and Gram negative bacteria. © 2016 Elsevier Inc. All rights reserved.},
note = {30},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Metal ion in bimetallic nanoparticles has shown vast potential in a variety of applications. In this paper we show the results of physical and chemical investigations of powder Ag/Cu nanoparticles obtained by chemical synthesis. Transmission electron microscopy (TEM) experiment indicated the presence of bimetallic nanoparticles in the agglomerated form. The average size of silver and copper nanoparticles is 17.1(4) nm (Ag) and 28.9(2) nm (Cu) basing on the X-ray diffraction (XRD) data. X-ray photoelectron (XPS) and Raman spectroscopies revealed the existence of metallic silver and copper as well as Cu2O and CuO being a part of the nanoparticles. Moreover, UV-Vis spectroscopy showed surface alloy of Ag and Cu while Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS) and Energy Dispersive X-ray Spectroscopy (EDX) showed heterogeneously distributed Ag structures placed on spherical Cu nanoparticles. The tests of antibacterial activity show promising killing/inhibiting growth behaviour for Gram positive and Gram negative bacteria. © 2016 Elsevier Inc. All rights reserved.