Super gas barrier of transparent polymer-clay multilayer ultrathin films

Nano Letters

Volumn 10, Issue 12, 2010, Pages 4970-4974

  Priolo, Morgan A ^a,b   Gamboa, Daniel ^b   Holder, Kevin M ^a   Grunlan, Jaime C ^a,b  

^a TEXAS A AND M UNIVERSITY   (United States)

^b Texas AandM University   (United States)

Author keywords

clays; composites; Layer by layer assembly; oxygen barrier; thin films; transmission electron microscopy

Indexed keywords

BARRIER PROTECTION; CLAY LAYERS; COMPOSITES; GAS BARRIER; HIGH FLEXIBILITY; LAYER-BY-LAYER ASSEMBLIES; MULTILAYER ULTRATHIN FILMS; NANOCOMPOSITE THIN FILMS; ORDERS OF MAGNITUDE; OXYGEN BARRIER; OXYGEN PERMEABILITY; PACKAGING APPLICATIONS; TRANSMISSION ELECTRON; TRANSPARENT POLYMER;

FILM PREPARATION; MULTILAYER FILMS; NANOCOMPOSITES; OXYGEN; PACKAGING MATERIALS; POLYMER FILMS; POLYMERS; SILICON COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; ULTRATHIN FILMS;

GAS PERMEABLE MEMBRANES;

EID: 78650159119     PISSN: 15306984     EISSN: 15306992     Source Type: Journal    
DOI: 10.1021/nl103047k     Document Type: Article

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32. The following aqueous mixtures were prepared using 18.2 MΩ deionized water from a Direct-Q 5 Ultrapure Water System (Millipore, Billerica, MA). Aqueous solutions of PEI (0.1 wt % in deionized water) were prepared by rolling for 24 h. Prior to deposition, each PEI solution's pH was altered to 10 using 1 M HCl. Aqueous solutions of PAA (0.2 wt % in deionized water) were prepared by rolling for 24 h, and each PAA solution's pH was altered to 4 using 1 M NaOH. Anionic suspensions of MMT (1.0 wt % in deionized water) were prepared by rolling for 24 h. Each appropriately treated substrate was dipped in the PEI solution for 5 min, rinsed with deionized water, and dried. This procedure was followed by an identical dipping, rinsing, and drying procedure in the PAA solution. After this initial bilayer was deposited, the same procedure was followed with only 1 min dip times for subsequent layers. This procedure was repeated until the desired number of layers was achieved. All thin films were prepared using a home-built robotic dipping system. (46, 47)
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