Article

Bactericidal silver ion delivery into hydrophobic coatings with surfactants

School of Engineering Technology, Eastern Michigan University, Ypsilanti, MI 48197, USA.
Journal of Industrial Microbiology and Biotechnology (Impact Factor: 2.51). 09/2007; 34(8):571-5. DOI: 10.1007/s10295-007-0228-2
Source: PubMed

ABSTRACT A much studied oil-soluble surfactant, bis[2-ethylhexyl]sulfosuccinate, sodium salt, was ion exchanged into the silver ion form and dissolved into microemulsions of immiscible polyurethane step monomers. Coating and curing of these microemulsions produced polyurethane coatings that exhibit bactericidal activity against representative Gram negative bacteria. After 24 h exposure, 0.006-0.012% weight Ag relative to coating weight (0.0013-0.0025 micromol Ag/cm2) results in the three-log reduction in Escherichia coli. A slightly higher level of 0.031% weight Ag relative to coating weight (0.006 micromol Ag/cm2) killed all of the E. coli after 12 h exposure. Similar results were obtained for Pseudomonas aeruginosa. Since the double-tail surfactant anion promotes reverse micelle formation in many different kinds of oils and solvents, it appears an excellent vector for incorporating low and effective amounts of silver ion into many industrial, hospital, and household coating formulations.

Download full-text

Full-text

Available from: John Texter, Aug 12, 2015
0 Followers
 · 
169 Views
  • Source
    • "Metallic nanoparticles (NP) are finding increasing applications in electrochemistry, catalysis, sensor, optoelectronics , biotechnology and other emerging research fields [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]. Apart from this, Ag NP also exhibit various biological activities including antifungal and antibacterial properties [12] [13] [14] [15]. In general, the metallic NP tend to aggregate, and it is quite challenging to keep them stable in dispersion. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Poly(ionic liquids)(PILs) of the types poly(1-vinyl-3-alkyl imidazolium)X (where alkyl = ethyl, butyl & pentyl; X = Br� or OH�) are synthesized and used for the preparation of stable silver, gold and nickel nanoparticles in solution. Studies pertaining to the dispersion of metal NP stabilized by PILs are discussed. The role of PILs is prominent as carriers towards reversible ‘‘solubility switch’’ of synthesized metal nanoparticles between aqueous and organic media by simple anionic metathesis. These PIL stabilized nanoparticles show great stability for longer period without agglomeration. At another role of employed PIL is the ability to tune the size of the metal NP, depending on the length of alkyl chains of PIL. UV–Visible, SEM and TEM techniques are used for the characterization and morphological study. PIL stabilized Ag NP shows very good antimicrobial activity at lower concentrations against Escherichia coli and Staphylococcus aureus. Ag NP are used in the catalytic reduction of aromatic nitro compounds with NaBH4 and that of Ni NP for hydrogen transfer reduction of acetophenone in quantitative yields.
    European Polymer Journal 09/2014; 60:114-122. DOI:10.1016/j.eurpolymj.2014.09.004 · 3.24 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Silver ions inhibited the oxidation of glucose, glycerol, fumarate, succinate, D and L lactate, and endogenous substrates by intact cell suspensions of E. coli. Silver ions reacted with the respiratory chain at two levels. The site most sensitive to inhibition was located between the b cytochromes and cytochrome a2. The second level of inhibition was in the NADH and succinate dehydrogenase regions of the respiratory chain, and was situated on the substrate side of the flavin components.
    Canadian Journal of Microbiology 07/1974; 20(6):883-9. DOI:10.1139/m74-135 · 1.18 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Reliability engineering activity for the vertical launch ASROC (VLA) antisubmarine missile is discussed. The program necessitated task tailoring and a search for cost-effectiveness. This work is a compilation of lessons learned for a low-cost, medium-size reliability program. It shows that careful attention to technical and administrative details will lead to successful hardware functions as demonstrated through testing. Properly conducted reliability efforts can make substantial contributions to achieve desired results. Highlights from the conduct of each assigned task are presented, and are discussed under the headings of MIL-STD-785. This reflective view of those experiences may be of assistance of planning future reliability programs of any size
    Reliability and Maintainability Symposium, 1991. Proceedings., Annual; 03/1991
Show more