Alkaline lignin extracted from furfural residues for pH-responsive Pickering emulsions and their recyclable polymerization

Wei, Zengjiang; Yang, Yu; Yang, Rui; Wang, Chaoyang

doi:10.1039/c2gc36278c

Cited by 166 publications

(150 citation statements)

References 29 publications

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“…8,21 Wei et al measured zeta potentials up to -91.5 mV for lignin nanoparticle dispersions at pH 11. 10 To evaluate the sensitivity of the lignin nanoparticle dispersion to changes in its environment, the stability of the dispersion was also studied at different salt concentrations and pH. Figure 4 shows the effect of NaCl on the nanoparticle size and zeta potential over a 7-day period.…”

Section: Effect Of Time Salt Concentration and Ph On Particle Stabilitymentioning

confidence: 99%

A simple process for lignin nanoparticle preparation

et al. 2016

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The lack of renewable resources and their inefficient use is a major challenge facing the society. Lignin is a natural biopolymer obtained mainly as a by-product from pulp-and paper-making industry, and is primarily burned to produce energy. However, the interest for using lignin in more advanced applications has increased rapidly. In particular, lignin based nanoparticles could find potential use in functional surface coatings, nanoglues, drug delivery, and microfluidic devices. In this work, a straightforward method to produce lignin nanoparticles from waste lignin obtained from kraft pulping is introduced.Spherical lignin nanoparticles were obtained by dissolving soft wood kraft lignin in tetrahydrofuran (THF) and subsequently introducing water into the system through dialysis. No chemical modification of the lignin was needed. Water acts as a nonsolvent reducing lignin's degrees of freedom causing the segregation of hydrophobic regions to compartments within the forming nanoparticles. The final size of the nanoparticles depended on the pre-dialysis concentration of dissolved lignin. The stability of the nanoparticle dispersion as a function of time, salt concentration and pH was studied. In pure water and room temperature the lignin nanoparticle dispersion was stable for over two months, but very low pH or high salt concentration induced aggregation. It was further demonstrated that the surface charge of the particles could be reversed and stable cationic lignin nanoparticles were produced by adsorption of poly(diallyldimethylammonium chloride) (PDADMAC).

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Section: Effect Of Time Salt Concentration and Ph On Particle Stabilitymentioning

confidence: 99%

A simple process for lignin nanoparticle preparation

et al. 2016

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“…In contrast, Pickering emulsions are stabilized by adsorption of solid particles at the oil-water interface, 31 which can greatly enhance the stability of emulsion, reduce the loss of core material, and guarantee the high encapsulation efficiency. 38 As the schematic plot shown in Fig. 35,36 Moreover, various particle stabilizers retained in shell can introduce multiple functions (e.g., pH sensitiveness, magnetic responsiveness) into microcapsules, which is conducive to develop the promising application of microcapsules in intelligent materials.…”

Section: Introductionmentioning

confidence: 99%

Multilayer composite microcapsules synthesized by Pickering emulsion templates and their application in self-healing coating

Yang

et al. 2015

J. Mater. Chem. A

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ARTICLE This journal isMultilayer composite microcapsules, richly and efficiently loaded with healing reagents (Isophorone diisocyanate, IPDI), are prepared based on lignin nanoparticle-stabilized oil-in-water (O/W) Pickering emulsion templates. The size control of the microcapsules is conducted by varying the lignin content and oil-water volume ratio in Pickering emulsions. With scanning electron microscope (SEM) and optical microscope (OM), the resulting microcapsules show spherical shape, ideal structure of rough outer surface and smooth inner surface, shell thickness of 4.5 m and mean diameter of 40-117 m. Fourier transform infrared spectra (FTIR) and Thermal gravimetric analysis (TGA) indicate extraordinary characteristics of the capsules: core fractions of 81.1 wt.%, excellent thermal stability with initial evaporating temperature of IPDI elevated for 72 °C, firm durability among aqueous solution-submersion and air-exposure with mass loss about 9.7 wt.% after four days submersion or two weeks exposure. Furthermore, the microcapsules are embedded into epoxy coatings for applying this technology into anticorrosive polymer coatings. Investigated by brine-submersion corrosion-accelerating test, the selfhealing microcapsules-incorporated epoxy coatings on steel plates demonstrate good dispersibility of capsules in coatings and favourable anticorrosive effects.

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“…Nevertheless, some well-designed stimulisensitive microcapsules can be embedded to endow the waterborne coatings capabilities of superhydrophobicity, 21 selfhealing ability, and corrosion resistance. 12,32 After ploymerization, the products can combine the properties of both polymeric and inorganic constituents, and hence demonstrate the robustness both in chemical composition and mechanical strength. Pickering emulsion droplets can act as templates directing the assembly process of the solid particles onto the interfaces to form 55 hierarchical structure.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of pH and UV dual-responsive microcapsules with high loading capacity and their application in self-healing hydrophobic coatings

et al. 2015

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Multi-stimuli responsive polymer microcapsules are attracting much interest owing to their more and tuanble functionalities, but it still remains a great challenge to develop facile and cost-efficient strategies for fabrication of these microcapsules. In this study, we report a simple and facile method to synthesize pH and UV dual-responsive microcapsules by UV-initiated polymerization of Pickering emulsions stabilized with SiO 2 and TiO 2 nanoparticles. Because the UV-initiated polymerization is gentle and fast, the asobtained microcapsules can encapsulate as high as 30 wt% of hydrophobic compound based on the total mass of the capsules. When these 10 microcapsules are used in waterborne coatings, these coatings exhibit not only quick responses to pH and UV stimuli, but also very good self-repairing performance. Journal Name, [year], [vol], 00-00 | 5 65When treated in UV accelerated weathering tester for 408 h, the WCA of D0.75-coating increased to 154.7°, owing to the slow release of FAS12 molecules from D0.75-capsules. And this superhydrophobic surface could hold more than 960 h in accelerated weathering tester (Fig. 8b), which is enough for 70

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Alkaline lignin extracted from furfural residues for pH-responsive Pickering emulsions and their recyclable polymerization

Cited by 166 publications

References 29 publications

A simple process for lignin nanoparticle preparation

A simple process for lignin nanoparticle preparation

Multilayer composite microcapsules synthesized by Pickering emulsion templates and their application in self-healing coating

Synthesis of pH and UV dual-responsive microcapsules with high loading capacity and their application in self-healing hydrophobic coatings

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