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Chemistry

Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology

Published: July 20th, 2016

DOI:

10.3791/54133

1Department of Chemistry, McGill University, 2Center for Self-Assembled Chemical Structures (CSACS), McGill University, 3Pulp and Paper Research Center, McGill University

Synthesis schemes to prepare highly stable wood fiber-based hairy nanoparticles and functional cellulose-based biopolymers have been detailed.

Nanoparticles, as one of the key materials in nanotechnology and nanomedicine, have gained significant importance during the past decade. While metal-based nanoparticles are associated with synthetic and environmental hassles, cellulose introduces a green, sustainable alternative for nanoparticle synthesis. Here, we present the chemical synthesis and separation procedures to produce new classes of hairy nanoparticles (bearing both amorphous and crystalline regions) and biopolymers based on wood fibers. Through periodate oxidation of soft wood pulp, the glucose ring of cellulose is opened at the C2-C3 bond to form 2,3-dialdehyde groups. Further heating of the partially oxidized fibers (e.g., T = 80 °C) results in three products, namely fibrous oxidized cellulose, sterically stabilized nanocrystalline cellulose (SNCC), and dissolved dialdehyde modified cellulose (DAMC), which are well separated by intermittent centrifugation and co-solvent addition. The partially oxidized fibers (without heating) were used as a highly reactive intermediate to react with chlorite for converting almost all aldehyde to carboxyl groups. Co-solvent precipitation and centrifugation resulted in electrosterically stabilized nanocrystalline cellulose (ENCC) and dicarboxylated cellulose (DCC). The aldehyde content of SNCC and consequently surface charge of ENCC (carboxyl content) were precisely controlled by controlling the periodate oxidation reaction time, resulting in highly stable nanoparticles bearing more than 7 mmol functional groups per gram of nanoparticles (e.g., as compared to conventional NCC bearing << 1 mmol functional group/g). Atomic force microscopy (AFM), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) attested to the rod-like morphology. Conductometric titration, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), dynamic light scattering (DLS), electrokinetic-sonic-amplitude (ESA) and acoustic attenuation spectroscopy shed light on the superior properties of these nanomaterials.

Cellulose, as the most abundant biopolymer in the world, has been served recently as a key raw material to yield crystalline nanoparticles named nanocrystalline cellulose (NCC, also known as cellulose nanocrystals CNC)1. To understand the mechanism of NCC synthesis, the structure of cellulose fibers needs to be explored. Cellulose is a linear and polydispersed polymer comprising poly-beta(1,4)-D-glucose residues2. The sugar rings in each monomer are connected through glycosidic oxygen to form chains of (1-1.5) x 104 glucopyranose units2,3, introducing alternating crystalline parts and disordered, amorphous regions, first rep....

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CAUTION: Read the material safety data sheets (MSDS) of all the chemicals before touching them. Many of the chemicals used in this work may cause severe health damages. Using personal protection such as lab coat, gloves, and goggles is a must. Do not forget that safety comes first. The water used throughout the synthesis is distilled water.

1. Preparation of Partially Oxidized Fibers as an Intermediate

  1. Tear 4 g Q-90 softwood pulp sheets into small pieces of approximately 2 x 2 cm

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The mass portion and charge content of each fraction during the periodate and chlorite oxidation of pulp depends on the reaction time (Table 1). Moreover, DAC molecular weight depends on heating condition and residence time (Table 2). Once SNCC and DAMC are made, they precipitate out by adding propanol (Figure 1). To measure the charge content of ENCC, conductometric titration is performed (Figure 2). NCC and ENCC colloid.......

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Following the chemistry discussed in this visual paper, a spectrum of highly stable cellulose-based nanoparticles with tunable charge bearing both crystalline and amorphous phases (hairy nanocrystalline celluloses) are produced. Depending on the periodate oxidation time, as shown in Table 1, various products are yielded: oxidized fibers (fraction 1), SNCC (fraction 2), and DAMC (fraction 3) each of which providing unique properties, such as defined size, morphology, crystallinity, and aldehyde content. F.......

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Financial support from an Industrial Research Chair funded by FPInnovations and NSERC for a NSERC Discovery grant and from the NSERC Innovative Green Wood Fiber Products Network are acknowledged.

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Name Company Catalog Number Comments
Q-90 softwood pulp FPInnovations - -
Sodium periodate Sigma-Aldrich S1878-500G/CAS7790-28-5 Light sensitive, Strong oxidizer, must be kept away from flammable materials
Sodium chloride ACP Chemicals S2830-3kg/7647-14-5 -
2-Propanol Fisher L-13597/67-63-0 Flammable
Ethylene glycol Sigma-Aldrich 102466-1L/107-21-1 -
Sodium hydroxide Fisher L-19234/1310-73-2 Strong base, causes serious health effects
Sodium chlorite Sigma-Aldrich 71388-250G/7758-19-2 Reactive with reducing agents and combustible materials
Hydrogen peroxide Fisher H325-500/7722-84-1 Corrosive and oxidizing agent, keep in a cool and dark place
Ethanol Commercial alcohols P016EAAN Flammable
Hydrochloric acid ACP Chemicals H-6100-500mL/7647-01-0 Strong acid, causes serious health effects
Hydroxylamine hydrochloride Sigma-Aldrich 159417-100G/5470-11-1 Unstable at high temperature and humidity, mutagenic
Centrifuge Beckman Coulter J2 High rotary speed
Fixed angle rotor Beckman Coulter JA-25.50 Tighten the lid carefully
Dialysis tubing Spectrum Labs Spectra (Part No. 132676) Cutoff Mw = 12-14 kD, Length ~ 30 cm, width ~ 4.5 cm
Aluminum cup VWR 611-1371 57 mm
Titrator Metrohm 836 Titrando -

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