Characterization of Ag and Au nanolayers on Cu alloys by TLC, SEM‐EDS, and ICP‐OES

Abstract

This paper reports a study on four historical samples from 19th century originating from Croatia, Europe, made of silver plated and gilded copper alloys. The investigation was carried out by chromatographic, spectroscopic, and microscopic techniques. Corrosion was identified in all samples by scanning electron microscope-energy dispersive spectroscopy (SEM-EDS), although the samples were in well-preserved states. EDS has given the following average composition of elements Ag (82.99, 4.74, 6.34,and 15.54 wt% in samples 1-4, respectively), Au (17.01 wt% in sample 1), and Cu (0, 95.26, 93.66, and 84.46 wt% in samples 1-4, respectively) for the outer layers of the samples.The exact sample elemental composition was determined by inductively coupled plasma optical emission spectroscopy (ICP-OES): 0.12, 0.22, 0.68, and 1.20 wt% Ag in samples 1-4, respectively and 0.02 wt% Au in sample 2, all on Cu alloys with impurities of Fe, Mn, Ni, Pb, Sb, Si, Sn, and Zn (in quantities 0.05-1.48 wt%). Preliminary detection of metals was performed by thin-layer chromatography. Results of determined chemical composition were consistent with similar investigations, since silver-plated and gilded Cu alloys were the materials used in the production of similar samples through the history.

Development of Antibacterial Protective Coatings Active against MSSA and MRSA on Biodegradable Polymers

“…The main hypotheses of our work are following: (i) 3D printing enables the design and production of biodegradable polymer with desired shapes and sizes which can act as an antibacterial coating carrier; (ii) the printed carrier that can be easily functionalized by sol-gel methodology; (iii) NPs in the coatings of metals and metal oxides have antibacterial effects against microorganisms resistant to antibiotics, such are MRSA and MSSA; and (iv) characterization of newly produced materials can be performed by using combination of chromatographic, spectroscopic and microscopic techniques. This research follows our previous research work and recent literature findings [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. In addition, although in this work the focus was on the preparation of plate-shaped PLA carriers, due to the user-friendly properties of 3D printing, any desired shape can be produced and functionalized in the same manner.…”

“…By varying the stationary and mobile phases it is possible to develop specially designed methods for monitoring and evaluation of particular components. In addition to ion chromatography, which is mainly applied in the analysis of metals, thin layer chromatography enables efficient evaluation of metals in the form of nanoparticles or nanolayers [ 34 , 35 , 36 , 37 , 38 , 39 ].…”

Synthesis, Modification and Characterization of Antimicrobial Textile Surface Containing ZnO Nanoparticles

“…In this investigation, both SEM-EDX and FTIR spectroscopic methods were used to proof the quality of achieved modification of cellulose materials before the antimicrobial testing. SEM-EDX methodology enabled the fast and simple non-destructive investigation of the sample morphology and surface chemical composition [ 39 , 40 , 41 ]. The samples were observed under 80× magnification, after a process in which the samples were coated with the Au/Pd uniform coating ( Figure 1 ).…”

Functionalization of Polymer Surface with Antimicrobial Microcapsules

“…Antimicrobial components are present in the liquid form [ 32 , 33 , 34 ]. Recent focus is on the application of gold or silver nanoparticles [ 35 , 36 , 37 ] and for the characterization of such materials particular methodology and combination of spectroscopic and microscopic techniques is needed [ 38 , 39 , 40 ]. The process has three stages, which include immersion of the substrate, the forming of a wet layer and drying of the coating by solvent evaporation.…”