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Photochemical Deposition of Silver Nanoparticles on Clays and Exploring Their Antibacterial Activity.
ACS Appl Mater Interfaces. 2016 Aug 24; 8(33):21640-7.AA

Abstract

Photochemical method was used to synthesize silver nanoparticles (AgNPs) in the presence of citrate or clay (SWy-1, SYn-1, and Laponite B) as stabilizers and Lucirin TPO as photoinitiator. During the photochemical synthesis, an appearance of the plasmon absorption band was seen around 400 nm, indicating the formation of AgNPs. X-ray diffraction results suggested that AgNPs prepared in SWy-1 were adsorbed into interlamellar space, and moreover, showed some clay exfoliation. In the case of SYn-1, AgNPs was not intercalated. For the AgNP/Lap B sample, the formation of an exfoliated structure occurred. Transmission electron microscopy revealed the spherical shape of AgNPs for all samples. The particle sizes obtained for AgNP/SWy-1, AgNP/SYn-1, and AgNP/Lap B were 2.6, 5.1, and 3.8 nm, respectively. AgNPs adsorbed on SYn-1 reveal nonuniform size and aggregation of some particles. However, AgNP/SWy-1 and AgNP/Lap B samples are more uniform and have diameters smaller than those prepared with SYn-1. This behavior is due to the ability to exfoliate these clays. The antibacterial activities of pure clays, AgNP/citrate, and AgNP/clays were investigated against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). AgNPs in the presence of clays (AgNPs/SYn-1 and AgNPs/SWy-1) showed a lower survival index percentage compared to those obtained for pure clays and AgNPs. The AgNP/SWy-1 sample showed good antibacterial activity against both tested species and the lowest survival index of 3.9 and 4.3 against E. coli and S. aureus, respectively. AgNPs are located in the interlayer region of the SWy-1, which has acid sites. These acidic sites may contribute to the release of Ag(+) ions from the surface of AgNPs. On the other hand, Laponite B and AgNP/Lap B samples did not demonstrate any bactericidal activity.

Authors+Show Affiliations

Instituto de Química de São Carlos, Universidade de São Paulo , Caixa Postal 780, 13560-970 São Carlos SP, Brazil.Instituto de Química de São Carlos, Universidade de São Paulo , Caixa Postal 780, 13560-970 São Carlos SP, Brazil.Instituto de Química de São Carlos, Universidade de São Paulo , Caixa Postal 780, 13560-970 São Carlos SP, Brazil.Instituto de Química de São Carlos, Universidade de São Paulo , Caixa Postal 780, 13560-970 São Carlos SP, Brazil.Instituto de Química de São Carlos, Universidade de São Paulo , Caixa Postal 780, 13560-970 São Carlos SP, Brazil.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27487246

Citation

Lombardo, Patrícia C., et al. "Photochemical Deposition of Silver Nanoparticles On Clays and Exploring Their Antibacterial Activity." ACS Applied Materials & Interfaces, vol. 8, no. 33, 2016, pp. 21640-7.
Lombardo PC, Poli AL, Castro LF, et al. Photochemical Deposition of Silver Nanoparticles on Clays and Exploring Their Antibacterial Activity. ACS Appl Mater Interfaces. 2016;8(33):21640-7.
Lombardo, P. C., Poli, A. L., Castro, L. F., Perussi, J. R., & Schmitt, C. C. (2016). Photochemical Deposition of Silver Nanoparticles on Clays and Exploring Their Antibacterial Activity. ACS Applied Materials & Interfaces, 8(33), 21640-7. https://doi.org/10.1021/acsami.6b05292
Lombardo PC, et al. Photochemical Deposition of Silver Nanoparticles On Clays and Exploring Their Antibacterial Activity. ACS Appl Mater Interfaces. 2016 Aug 24;8(33):21640-7. PubMed PMID: 27487246.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photochemical Deposition of Silver Nanoparticles on Clays and Exploring Their Antibacterial Activity. AU - Lombardo,Patrícia C, AU - Poli,Alessandra L, AU - Castro,Lucas F, AU - Perussi,Janice R, AU - Schmitt,Carla C, Y1 - 2016/08/10/ PY - 2016/8/4/entrez PY - 2016/8/4/pubmed PY - 2018/11/2/medline KW - UV irradiation KW - antibacterial activity KW - clay KW - nanocomposites KW - silver nanoparticles (AgNPs) SP - 21640 EP - 7 JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces VL - 8 IS - 33 N2 - Photochemical method was used to synthesize silver nanoparticles (AgNPs) in the presence of citrate or clay (SWy-1, SYn-1, and Laponite B) as stabilizers and Lucirin TPO as photoinitiator. During the photochemical synthesis, an appearance of the plasmon absorption band was seen around 400 nm, indicating the formation of AgNPs. X-ray diffraction results suggested that AgNPs prepared in SWy-1 were adsorbed into interlamellar space, and moreover, showed some clay exfoliation. In the case of SYn-1, AgNPs was not intercalated. For the AgNP/Lap B sample, the formation of an exfoliated structure occurred. Transmission electron microscopy revealed the spherical shape of AgNPs for all samples. The particle sizes obtained for AgNP/SWy-1, AgNP/SYn-1, and AgNP/Lap B were 2.6, 5.1, and 3.8 nm, respectively. AgNPs adsorbed on SYn-1 reveal nonuniform size and aggregation of some particles. However, AgNP/SWy-1 and AgNP/Lap B samples are more uniform and have diameters smaller than those prepared with SYn-1. This behavior is due to the ability to exfoliate these clays. The antibacterial activities of pure clays, AgNP/citrate, and AgNP/clays were investigated against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). AgNPs in the presence of clays (AgNPs/SYn-1 and AgNPs/SWy-1) showed a lower survival index percentage compared to those obtained for pure clays and AgNPs. The AgNP/SWy-1 sample showed good antibacterial activity against both tested species and the lowest survival index of 3.9 and 4.3 against E. coli and S. aureus, respectively. AgNPs are located in the interlayer region of the SWy-1, which has acid sites. These acidic sites may contribute to the release of Ag(+) ions from the surface of AgNPs. On the other hand, Laponite B and AgNP/Lap B samples did not demonstrate any bactericidal activity. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/27487246/Photochemical_Deposition_of_Silver_Nanoparticles_on_Clays_and_Exploring_Their_Antibacterial_Activity_ L2 - https://doi.org/10.1021/acsami.6b05292 DB - PRIME DP - Unbound Medicine ER -