Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We report the effect of cationic polyacrylamide (CPAM) addition on the structural assembly of silica nanoparticles (NPs) within a nanocellulose fibre matrix. Paper like composites are fabricated by first forming complexes of NPs with CPAM, then adding those to a suspension of nanocellulose fibres; followed by filtration, pressing and drying of the final suspension. Complementary small angle X-ray scattering (SAXS) and microscopy (SEM, TEM) investigations of these composites showed a lognormal bimodal distribution of NP sizes. Data analysis allows understanding interparticle interactions within assemblies of SiO2 NPs at the nanometer scale with respect to different dosage of CPAM. Increasing CPAM dosage increases retention of NPs within the cellulose matrix with stronger interparticle interactions and produces composites with smaller pores. The correlation length of NPs, indicative of the size of the NP clusters increased from 30 to 70 nm as the CPAM dosage increased from 16.5 to 330 mg/g NPs. Retention and assembly of SiONPs by varying CPAM dosage results from the balance of different interaction forces between NPs, CPAM and nanocellulose fibres. Understanding the effect of CPAM dosage on the various NP and composite structural conformations enables us to engineer novel hierarchically and functional cellulose based structured materials.
LanguageEnglish
Pages373-379
Number of pages7
JournalColloids and Surfaces A: Physicohemical and Engineering Aspects
Volume513
DOIs
StatePublished - 5 Jan 2017

Keywords

  • Small angle X-ray scattering (SAXS)
  • TEM
  • Silica nanoparticles (NPs)
  • Cationic polyacrylamide (CPAM)

Cite this

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title = "Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures",
abstract = "We report the effect of cationic polyacrylamide (CPAM) addition on the structural assembly of silica nanoparticles (NPs) within a nanocellulose fibre matrix. Paper like composites are fabricated by first forming complexes of NPs with CPAM, then adding those to a suspension of nanocellulose fibres; followed by filtration, pressing and drying of the final suspension. Complementary small angle X-ray scattering (SAXS) and microscopy (SEM, TEM) investigations of these composites showed a lognormal bimodal distribution of NP sizes. Data analysis allows understanding interparticle interactions within assemblies of SiO2 NPs at the nanometer scale with respect to different dosage of CPAM. Increasing CPAM dosage increases retention of NPs within the cellulose matrix with stronger interparticle interactions and produces composites with smaller pores. The correlation length of NPs, indicative of the size of the NP clusters increased from 30 to 70 nm as the CPAM dosage increased from 16.5 to 330 mg/g NPs. Retention and assembly of SiO2 NPs by varying CPAM dosage results from the balance of different interaction forces between NPs, CPAM and nanocellulose fibres. Understanding the effect of CPAM dosage on the various NP and composite structural conformations enables us to engineer novel hierarchically and functional cellulose based structured materials.",
keywords = "Small angle X-ray scattering (SAXS), TEM, Silica nanoparticles (NPs), Cationic polyacrylamide (CPAM)",
author = "Garusinghe, {Uthpala M.} and Raghuwanshi, {Vikram S.} and Garvey, {Christopher J.} and Swambabu Varanasi and Hutchinson, {Christopher R.} and Warren Batchelor and Gil Garnier",
year = "2017",
month = "1",
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doi = "10.1016/j.colsurfa.2016.10.068",
language = "English",
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pages = "373--379",
journal = "Colloids and Surfaces A: Physicohemical and Engineering Aspects",
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Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures. / Garusinghe, Uthpala M.; Raghuwanshi, Vikram S.; Garvey, Christopher J.; Varanasi, Swambabu; Hutchinson, Christopher R.; Batchelor, Warren; Garnier, Gil.

In: Colloids and Surfaces A: Physicohemical and Engineering Aspects, Vol. 513, 05.01.2017, p. 373-379.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures

AU - Garusinghe,Uthpala M.

AU - Raghuwanshi,Vikram S.

AU - Garvey,Christopher J.

AU - Varanasi,Swambabu

AU - Hutchinson,Christopher R.

AU - Batchelor,Warren

AU - Garnier,Gil

PY - 2017/1/5

Y1 - 2017/1/5

N2 - We report the effect of cationic polyacrylamide (CPAM) addition on the structural assembly of silica nanoparticles (NPs) within a nanocellulose fibre matrix. Paper like composites are fabricated by first forming complexes of NPs with CPAM, then adding those to a suspension of nanocellulose fibres; followed by filtration, pressing and drying of the final suspension. Complementary small angle X-ray scattering (SAXS) and microscopy (SEM, TEM) investigations of these composites showed a lognormal bimodal distribution of NP sizes. Data analysis allows understanding interparticle interactions within assemblies of SiO2 NPs at the nanometer scale with respect to different dosage of CPAM. Increasing CPAM dosage increases retention of NPs within the cellulose matrix with stronger interparticle interactions and produces composites with smaller pores. The correlation length of NPs, indicative of the size of the NP clusters increased from 30 to 70 nm as the CPAM dosage increased from 16.5 to 330 mg/g NPs. Retention and assembly of SiO2 NPs by varying CPAM dosage results from the balance of different interaction forces between NPs, CPAM and nanocellulose fibres. Understanding the effect of CPAM dosage on the various NP and composite structural conformations enables us to engineer novel hierarchically and functional cellulose based structured materials.

AB - We report the effect of cationic polyacrylamide (CPAM) addition on the structural assembly of silica nanoparticles (NPs) within a nanocellulose fibre matrix. Paper like composites are fabricated by first forming complexes of NPs with CPAM, then adding those to a suspension of nanocellulose fibres; followed by filtration, pressing and drying of the final suspension. Complementary small angle X-ray scattering (SAXS) and microscopy (SEM, TEM) investigations of these composites showed a lognormal bimodal distribution of NP sizes. Data analysis allows understanding interparticle interactions within assemblies of SiO2 NPs at the nanometer scale with respect to different dosage of CPAM. Increasing CPAM dosage increases retention of NPs within the cellulose matrix with stronger interparticle interactions and produces composites with smaller pores. The correlation length of NPs, indicative of the size of the NP clusters increased from 30 to 70 nm as the CPAM dosage increased from 16.5 to 330 mg/g NPs. Retention and assembly of SiO2 NPs by varying CPAM dosage results from the balance of different interaction forces between NPs, CPAM and nanocellulose fibres. Understanding the effect of CPAM dosage on the various NP and composite structural conformations enables us to engineer novel hierarchically and functional cellulose based structured materials.

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