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Rapid and direct preparation of lignin nanoparticles from alkaline pulping liquor by mild ultrasonication

DOI: 10.1021/acssuschemeng.9b05445 DOI Help

Authors: Melissa B. Agustin (University of Helsinki) , Paavo A. Penttilä (Aalto University) , Maarit Lahtinen (University of Helsinki) , Kirsi S. Mikkonen (University of Helsinki)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Sustainable Chemistry & Engineering

State: Published (Approved)
Published: November 2019
Diamond Proposal Number(s): 24748

Abstract: The production of lignin nanoparticles (LNPs) has opened new routes to utilization of lignin in advanced applications. The existing challenge, however, is to develop a production method that can easily be adapted on an industrial scale. In this study, we demonstrated a green and rapid method of preparing LNPs directly from a sulfur-free alkaline pulping liquor by combining acid-precipitation and ultrasonication. The combined method produced spherical LNPs, with hierarchical nanostructure and highly negative surface charge, within only 5-min of sonication. The mild, rapid sonication was achieved by sonicating directly without prior drying the acid-precipitated and dialyzed lignin. Optimization of the method revealed the potential for minimizingacid consumption, shortening the dialysis time, and processing directly the alkaline liquor with as much as 20 wt% lignin. The isolated LNPs were stable during storage for 180 days, at a pH range of 4–7 and in a dispersing medium below 0.1 M NaCl. The LNPs also displayed excellent emulsifying properties, stabilizing oil-in-water emulsions. Thus, this simple and energy-efficient method opens a sustainable, straightforward and scalable route to production of solvent-free LNPs, with high potential as interface stabilizers of multi-phase systems in the food and medical industries.

Journal Keywords: Lignin nanoparticle; ultrasonication; acid precipitation; alkaline pulping 16 liquor; emulsion; BLN lignin

Subject Areas: Chemistry, Biology and Bio-materials, Environment

Instruments: B21-High Throughput SAXS

Added On: 18/11/2019 10:22

Discipline Tags:

Biomaterials Chemistry Materials Science Chemical Engineering Engineering & Technology Nanoscience/Nanotechnology

Technical Tags:

Scattering Small Angle X-ray Scattering (SAXS)