View in EDS

Highly porous, ultra-low refractive index coatings produced through random packing of silicated cellulose nanocrystals.

Saved in:
Bibliographic Details
Title: Highly porous, ultra-low refractive index coatings produced through random packing of silicated cellulose nanocrystals.
Authors: Buskens, Pascal1,2 buskens@dwi.rwth-aachen.de, Mourad, Maurice1, Meulendijks, Nicole1, van Ee, Renz1, Burghoorn, Marieke1, Verheijen, Marcel3,4, van Veldhoven, Emile1
Source: Colloids & Surfaces A: Physicochemical & Engineering Aspects. Dec2015, Vol. 487, p1-8. 8p.
Subjects: Refractive index, Surface coatings, Cellulose nanocrystals, Silica rods, Pyrolysis
Abstract: The use of cellulose nanocrystals (CNCs) in optical materials has been extensively studied. Key in most applications reported to date is the chiral nematic ordering of CNCs. Here, we demonstrate that random packing of silicated CNCs can also yield materials with interesting optical properties, i.e. , highly porous, ultra-low refractive index coatings. Needle-shaped CNCs with an aspect ratio of 25 were extracted from Avicel, and subsequently covered with a silica layer. In one single dip coating step, highly porous coatings of CNC-silica core–shell particles were deposited on glass slides and silicon wafers. The lowest refractive index achieved was 1.03, which corresponds to a porosity of 94%; the thickness of these coatings ranged from 101 nm to 239 nm. The substrates, coated with a layer of CNC-silica core–shell particles, were heated to 450 °C for two hours. Cellulose was removed through pyrolysis, which resulted in porous coatings of sub-micron sized hollow silica rods. The porosity increase generated through pyrolysis of cellulose, however, was largely compensated by the decrease in packing porosity due to shrinkage of the coating. [ABSTRACT FROM AUTHOR]
Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 110740299
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Highly porous, ultra-low refractive index coatings produced through random packing of silicated cellulose nanocrystals.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Buskens%2C+Pascal%22">Buskens, Pascal</searchLink><relatesTo>1,2</relatesTo><i> buskens@dwi.rwth-aachen.de</i><br /><searchLink fieldCode="AR" term="%22Mourad%2C+Maurice%22">Mourad, Maurice</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Meulendijks%2C+Nicole%22">Meulendijks, Nicole</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22van+Ee%2C+Renz%22">van Ee, Renz</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burghoorn%2C+Marieke%22">Burghoorn, Marieke</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Verheijen%2C+Marcel%22">Verheijen, Marcel</searchLink><relatesTo>3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22van+Veldhoven%2C+Emile%22">van Veldhoven, Emile</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Colloids+%26+Surfaces+A%3A+Physicochemical+%26+Engineering+Aspects%22">Colloids & Surfaces A: Physicochemical & Engineering Aspects</searchLink>. Dec2015, Vol. 487, p1-8. 8p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Refractive+index%22">Refractive index</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+coatings%22">Surface coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Cellulose+nanocrystals%22">Cellulose nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Silica+rods%22">Silica rods</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrolysis%22">Pyrolysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The use of cellulose nanocrystals (CNCs) in optical materials has been extensively studied. Key in most applications reported to date is the chiral nematic ordering of CNCs. Here, we demonstrate that random packing of silicated CNCs can also yield materials with interesting optical properties, i.e. , highly porous, ultra-low refractive index coatings. Needle-shaped CNCs with an aspect ratio of 25 were extracted from Avicel, and subsequently covered with a silica layer. In one single dip coating step, highly porous coatings of CNC-silica core–shell particles were deposited on glass slides and silicon wafers. The lowest refractive index achieved was 1.03, which corresponds to a porosity of 94%; the thickness of these coatings ranged from 101 nm to 239 nm. The substrates, coated with a layer of CNC-silica core–shell particles, were heated to 450 °C for two hours. Cellulose was removed through pyrolysis, which resulted in porous coatings of sub-micron sized hollow silica rods. The porosity increase generated through pyrolysis of cellulose, however, was largely compensated by the decrease in packing porosity due to shrinkage of the coating. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=110740299
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.colsurfa.2015.09.041
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 1
    Subjects:
      – SubjectFull: Refractive index
        Type: general
      – SubjectFull: Surface coatings
        Type: general
      – SubjectFull: Cellulose nanocrystals
        Type: general
      – SubjectFull: Silica rods
        Type: general
      – SubjectFull: Pyrolysis
        Type: general
    Titles:
      – TitleFull: Highly porous, ultra-low refractive index coatings produced through random packing of silicated cellulose nanocrystals.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Buskens, Pascal
      – PersonEntity:
          Name:
            NameFull: Mourad, Maurice
      – PersonEntity:
          Name:
            NameFull: Meulendijks, Nicole
      – PersonEntity:
          Name:
            NameFull: van Ee, Renz
      – PersonEntity:
          Name:
            NameFull: Burghoorn, Marieke
      – PersonEntity:
          Name:
            NameFull: Verheijen, Marcel
      – PersonEntity:
          Name:
            NameFull: van Veldhoven, Emile
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 20
              M: 12
              Text: Dec2015
              Type: published
              Y: 2015
          Identifiers:
            – Type: issn-print
              Value: 09277757
          Numbering:
            – Type: volume
              Value: 487
          Titles:
            – TitleFull: Colloids & Surfaces A: Physicochemical & Engineering Aspects
              Type: main
ResultId 1