title: Potential applications of cold sprayed Cu50Ti20Ni30 metallic glassy alloy powders for antibacterial protective coating in medical and food sectors.
abstract: Mechanical alloying was utilized for synthesizing of metallic glassy Cu50Ti20Ni30 alloy powders, using a low energy ball milling technique. The metallic glassy powders obtained after 100 h of ball milling had an average particle size of 1.7 mm in diameter and possessed excellent thermal stability, indexed by a relatively high glass transition temperature (358.3 °C) with a wide supercooled liquid region (61 °C). This amorphous phase crystallized into Ti2Cu and CuTiNi2 ordered phases through two overlapped crystallization temperatures at 419.3 °C and 447.5 °C, respectively. The total enthalpy change of crystallization was -4.8 kJ/mol. The glassy powders were employed as feedstock materials to double-face coating the surface of SUS 304 substrate, using cold spraying process under helium gas pressure at 400 °C. This coating material had an extraordinary high nanohardness value of 3.1 GPa. Moreover, it showed a high resistance to wear with a low value of the coefficient of friction ranging from 0.45 to 0.45. Biofilms were grown on 20-mm(2) SUS304 sheets coated coupons inoculated with 1.5 × 10(8) CFU ml(-1)E. coli. Significant biofilm inhibition (p The inhibition of biofilm formation by nanocrystalline powders of Cu-based provides a practical approach to achieve the inhibition of biofilms formation.
authors.affiliation: Nanotechnology and Advanced Materials Program, Energy and Building Research Center, Kuwait Institute for Scientific Research, Safat, 13109 Kuwait, State of Kuwait. Electronic address: msherif@kisr.edu.kw.
authors.forename: M Sherif
authors.initials: MS
authors.lastname: El-Eskandrany
authors.affiliation: Biotechnology Program, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, Safat, 13109 Kuwait, State of Kuwait. Electronic address: aazmi@kisr.edu.kw.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Al-Azmi
mesh_terms: D000497:Alloys / Q000737:chemistry* / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects; D003080:Cold Temperature; D003343:Corrosion; D055119:Elastic Modulus; D004563:Electrochemistry; D004926:Escherichia coli / Q000187:drug effects / Q000502:physiology; D019649:Food Industry; D005898:Glass / Q000737:chemistry*; D006244:Hardness; D008422:Materials Testing; D055595:Mechanical Phenomena; D008511:Medicine; D036103:Nanotechnology; D011208:Powders
chemical_list: D000497:Alloys; D000900:Anti-Bacterial Agents; C000612426:Cu50-Ti20-Ni30 alloy; D011208:Powders
keywords: Antibacterial; Cold spray; Mechanical alloying; Metallic glasses; Nanomechanical properties; Tribological properties