Multifunctional Lignin-Silver Nanoparticles for Accelerating Polymerization and Cross-Linking of Sodium Polyacrylate

Han, Xiao; Hao, Zhenxin; Li, Chenyu; Liu, Kefeng; Dai, Lin; Si, Chuanling

doi:10.1021/acsapm.2c00093

Cited by 7 publications

(2 citation statements)

References 49 publications

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“…[50] Having demonstrated the reversible O 2 /N 2 -responsiveness of hy-LNPs, we also explored the possibility to use them as gas tunable nanoreactors for the production of gold hy-LNPs (Au-hy-LNPs). While it is well known that LNPs can be used as reduction and nucleation sites for metallic particles (e.g., silver and gold), [64][65][66][67] there are no reports on the preparation of such inorganic-organic hybrid particles controlled by external stimuli. Addition of AuHCl 4 solution to hy-LNPs 30 dispersion resulted in an evident color change towards a darker red tone as a consequence of the reduction of gold ions (Figure 4a).…”

Section: Resultsmentioning

confidence: 99%

Breathable Lignin Nanoparticles as Reversible Gas Swellable Nanoreactors

Moreno

Delgado-Lijarcio

Ronda

et al. 2022

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a tremendous attention owing the possibility for "on demand" engineering employing functional groups able to sense external stimuli such as pH, [5][6][7][8][9] light, [10][11][12] enzymes [13,14], and gases. [15,16] Among the advantages of these advanced materials, the most remarkable ones are the possibility to precisely control their disassembly processes in a spatiotemporal fashion, [12] and the ability to promote morphological transformations. [17,18] These features have made them a thriving research field in recent years, and attractive materials for important applications such as catalysis, biomedicine, or food technology have been developed. [19][20][21] However, most of these materials are derived from fossil resources and often are poorly biodegradable, [22] which together with the concerns about associated greenhouse gas emissions suggest that renewable polymers should play a crucial role in the development of the next generation of polymeric nanoparticles. In fact, macromolecules from renewable and abundant plant biomass are gaining a major role in the efforts to transition to a sustainable materials economy. [23][24][25] Among them, the aromatic plant polymer lignin is one of the most promising bio-based raw materials. [26][27][28][29][30][31] In this sense, lignin nanoparticles (LNPs) are postulated as prime platform for the development of stimuli-responsive nanoparticles. [32][33][34] In recent years the classical disdain on ligninbasically viewed as a byproduct from the pulp and paper industry and destined to be combusted -has given way to a paradigm shift towards the development of lignin-based advanced materials, supported by the inherent properties such as biodegradability, antioxidant activity, and absorbance of UV radiation which are preserved in LNPs. [35][36][37][38][39] In contrast to bulk lignin, LNPs resist aggregation in aqueous dispersions (pH 3-9) owing to their spherical shape and colloidal stability generated by the electrostatic repulsion forces mainly stemming from carboxylic acid and phenolic hydroxyl groups located on the surface of the particle. [40][41][42] This anionic surface charge has been exploited for physical modification of LNPs via adsorption of positively charged polyelectrolytes such as enzymes and polymers for a wide range of applications ranging from biocatalysts to composites among others. [43][44][45][46][47] Here, it is important to note that even one of the main limitations of LNPs, which arises from their dissolution in basic conditions (pH > 9) and aggregationThe design of stimuli-responsive lignin nanoparticles (LNPs) for advanced applications has hitherto been limited to the preparation of lignin-grafted polymers in which usually the lignin content is low (<25 wt.%) and its role is debatable. Here, the preparation of O 2 -responsive LNPs exceeding 75 wt.% in lignin content is shown. Softwood Kraft lignin (SKL) is coprecipitated with a modified SKL fluorinated oleic acid ester (SKL-OlF) to form colloidal stable hybrid LNPs (hy-LNPs). The hy-LNPs with a SKL-O...

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Section: Resultsmentioning

confidence: 99%

Breathable Lignin Nanoparticles as Reversible Gas Swellable Nanoreactors

Moreno

Delgado-Lijarcio

Ronda

et al. 2022

Small

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“…Nanoparticles such as nanocellulose [12] and lignin [13] are often incorporated into PVA-based hydrogels to improve their mechanical properties and drug release properties due to their abundant hydrogen bond networks and tunable surface characteristics [14][15][16][17][18]. Especially, the abundant pore structures [19], high surface area [20] and tunable surface chemistry [21], as well as wide renewability [4], make cellulose one of the most bioavailability materials for a vehicle for drug delivery [22,23]. The cellulose nano bers (CNF) derived from lignin-free lignocellulosic bers are so far extensive studies as nano llers for hydrogels [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Mechanically strong, self‐healing and pH‐responsive lignocellulose nanofibril‐based hydrogels towards drug delivery applications

Cheng,

Wang,

et al. 2023

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Employing lignocellulosic nanofibers (LCNF) with natural, high specific mechanical performance and abundant functional groups to design a hydrogel as a drug-sustained release carrier, which conforms to the concept of green and sustainable development. Herein, we facilely extracted carboxylated lignocellulose nanofibrils (CLCNF) from bagasse via a deep eutectic solvent (DES) and mechanical defibrillation-based strategy. The CLCNF crosslinked with poly(vinyl alcohol) (PVA) to obtain a nanocomposite hydrogel (PVA/CLCNF/B) whereupon the mechanical strength and drug release behavior were improved in the process. Consequently, the lignocellulose nanocomposite hydrogel presented a high compression modulus (3.92 MPa) and significant sustained‐release effect with a release rate of 80.73% after 36 h. TH delivery behavior of the PVA/CLCNF/B composite hydrogel could be controlled by acidic pH conditions. The TH release kinetics of PVA/CLCNF/B hydrogel in different phosphate buffer saline (PBS) followed the Korsmeyer‐Peppas model better, and the release of TH through the Fickian diffusion mechanism. Importantly, the vitro cytotoxicity tests showed PVA/CLCNF/B hydrogel had good biocompatibility. Overall, adding CLCNF to hydrogel may present great potential in drug release and therapy as a drug delivery carrier.

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