Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures

Uthpala M. Garusinghe; Vikram S. Raghuwanshi; Christopher J. Garvey; Swambabu Varanasi; Christopher R. Hutchinson; Warren Batchelor; Gil Garnier

doi:10.1016/j.colsurfa.2016.10.068

Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures

Uthpala M. Garusinghe, Vikram S. Raghuwanshi, Christopher J. Garvey, Swambabu Varanasi, Christopher R. Hutchinson, Warren Batchelor, Gil Garnier

Research output: Contribution to journal › Article › Research › peer-review

8 Citations (Scopus)

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 SiO₂NPs 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.

Original language	English
Pages (from-to)	373-379
Number of pages	7
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	513
DOIs	https://doi.org/10.1016/j.colsurfa.2016.10.068
Publication status	Published - 5 Jan 2017

Keywords

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

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@article{55b1365516824d5b895a6203c497f81c,

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",

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doi = "10.1016/j.colsurfa.2016.10.068",

language = "English",

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journal = "Colloids and Surfaces A: Physicochemical 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: Physicochemical and Engineering Aspects, Vol. 513, 05.01.2017, p. 373-379.

Research output: Contribution to journal › Article › Research › peer-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.

KW - Small angle X-ray scattering (SAXS)

KW - TEM

KW - Silica nanoparticles (NPs)

KW - Cationic polyacrylamide (CPAM)

U2 - 10.1016/j.colsurfa.2016.10.068

DO - 10.1016/j.colsurfa.2016.10.068

M3 - Article

VL - 513

SP - 373

EP - 379

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

ER -

Assembly of nanoparticles-polyelectrolyte complexes in nanofiber cellulose structures

Abstract

Keywords

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