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Paperboard  is  an  environment -friendly  multi -layer  material  widely  used  for  packaging  applic a- tions. However, for food packaging paperboard lacks essential barrier properties towards oxygen  and water vapor. Conventional solutions to enhance these barrier properties (e.g. paperboard film  coating  with  synthetic  polymers)  require  special  manufacturing  facilities  and  difficult  the  end -of -  life disposal and recycling of the paperboard. Paperboard coating with silica -based formulations is  an eco -friendly alternative hereby disclosed. Silica -nanocoating s were prepared by sol -gel synth e- sis,  with  or  without  the  addition  of  Zn(2) -Al -NO 3   layered  double  hydroxides  (LDHs),  and  applied   on  the  surface  (ca  2  g/m 2 )  of  industrial  paperboard  samples  by  a  roll -to -roll  technique.  The  ph y- sicochemical  features  of  silica -nanocoatings  were  studied  by  FTIR -ATR,  SEM/EDS,  XRD  analysis   and  surface  energy  measurements.  The  barrier  properties  of  uncoated  and  silica -coated  pape r- board  were  accessed  by  water  vapor  transmission  rate  (WVTR)  and  oxygen  permeability  ( J O 2 )  measurements.   The  best  barrier  results  were  obtained  for  paperboard  coated  with  a  mixture  of   tetraethoxysilane  (TEOS)  and  3 -aminopropyltriethoxysilane  (APTES),  with  and  without  the  in- corporation of LDHs

Silica-Based Nanocoating Doped by Layered Double Hydroxides to Enhance the Paperboard Barrier Properties