Academic literature on the topic 'Lignin nanoparticle'
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Journal articles on the topic "Lignin nanoparticle"
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Lee, Jae Hoon, Tae Min Kim, In-Gyu Choi, and Joon Weon Choi. "Phenolic Hydroxyl Groups in the Lignin Polymer Affect the Formation of Lignin Nanoparticles." Nanomaterials 11, no. 7 (July 9, 2021): 1790. http://dx.doi.org/10.3390/nano11071790.
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Alkaline soda lignin (AL) was sequentially fractionated into six fractions of different molecular size by means of solvent extraction and their phenolic hydroxyl groups were chemoselectively methylated to determine their effect on nanoparticle formation of lignin polymers. The effect of the lignin structure on the physical properties of nanoparticles was also clarified in this study. Nanoparticles were obtained from neat alkaline soda lignin (ALNP), solvent-extracted fractions (FALNPs, i.d. 414–1214 nm), and methylated lignins (MALNPs, i.d. 516–721 nm) via the nanoprecipitation method. Specifically, the size properties of MALNPs showed a high negative correlation (R2 = 0.95) with the phenolic hydroxyl group amount. This indicates that the phenolic hydroxyl groups in lignin could be influenced on the nucleation or condensation during the nanoprecipitation process. Lignin nanoparticles exhibited high colloidal stability, and most of them also showed good in vitro cell viability. This study presents a possible way to control nanoparticle size by blocking specific functional groups and decreasing the interaction between hydroxyl groups of lignin.
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Azimvand, J., Kh Didehban, and SA Mirshokraie. "Safranin-O removal from aqueous solutions using lignin nanoparticle-g-polyacrylic acid adsorbent: Synthesis, properties, and application." Adsorption Science & Technology 36, no. 7-8 (May 24, 2018): 1422–40. http://dx.doi.org/10.1177/0263617418777836.
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In this study, alkali lignin modified by ethylene glycol and lignin nanoparticles was prepared through acid precipitation technology. Lignin nanoparticle-g-polyacrylic acid adsorbent was prepared using copolymerization reactions between lignin nanoparticle and polyacrylic acid in the presence of potassium persulfate as the radical initiator. Then, lignin nanoparticle-g-polyacrylic acid adsorbent was used to remove Safranin-O from an aqueous environment. The adsorbent structures and morphologies of lignin nanoparticle and lignin nanoparticle-g-polyacrylic acid adsorbent were investigated using scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Nanoparticle sizes were assessed using dynamic light scattering. Equilibrium isotherms were compared using the Langmuir, Freundlich, and Temkin adsorption models. Both adsorbent lignin nanoparticle and lignin nanoparticle-g-polyacrylic acid adsorbent showed good agreement with the Langmuir isotherm. The maximum adsorption capacities of lignin nanoparticle and lignin nanoparticle-g-polyacrylic acid adsorbent reached 99 and 138.88 mg g−1 using model-like, pseudo-second-order, and intraparticle diffusion, respectively. Experimental results showed that adsorbent lignin nanoparticle and lignin nanoparticle-g-polyacrylic acid adsorbent followed the pseudo-second order kinetic model.
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Lee, Jae Hoon, Shin Young Park, In-Gyu Choi, and Joon Weon Choi. "Investigation of Molecular Size Effect on the Formation of Lignin Nanoparticles by Nanoprecipitation." Applied Sciences 10, no. 14 (July 17, 2020): 4910. http://dx.doi.org/10.3390/app10144910.
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In recent years, several studies focused on the synthesis of lignin-based nanoparticle in aqueous solution and its potential applications of the drug carrier were investigated. In this study, soda lignin (SL) nanoparticles (i.d. 128–560 nm) were synthesized by the nanoprecipitation process at three different concentrations (1, 2, and 4 mg/mL THF) with various molecular sizes of soda lignin (NP-F1, NP-F2, and NP-F3) obtained from sequential solvent extraction. The average molecular weights of SL, F1, F2, F3, F4, and F5 were 3130, 1190, 2550, 3680, 5310, and 14,650, respectively. The average size of the spherical lignin nanoparticle was a minimum of 128 nm for NP-C1 and the size increased up to 560 nm with increasing concentration. Particle surface charge increased with increasing concentration from −26 mV for NP-C1 to −38 mV for NP-C4. Contrary to expected general trends in polymeric nanoparticles, there was no remarkable change or trend with increasing lignin molecular weight since chemical structures of each lignin fraction are also remarkably different. Further studies to learn correlation between properties of lignin nanoparticle and its additional details regarding the chemical structures is needed.
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Wang, Yingchao, Niloofar Alipoormazandarani, Lauren Skye Puumala, Weijue Gao, Shanshan Liu, Fangong Kong, Qiang Wang, and Pedram Fatehi. "Amphiphilic Lignin Nanoparticles Made from Lignin-Acrylic Acid-Methyl Methacrylate Copolymers." Nanomaterials 12, no. 15 (July 29, 2022): 2612. http://dx.doi.org/10.3390/nano12152612.
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In this study, a novel amphiphilic KL-AA-MMA nanoparticle was prepared through the graft copolymerization of kraft lignin (KL) with acrylic acid (AA) and methyl methacrylate (MMA), using potassium persulfate as an initiator in a water/dimethyl sulfoxide solvent medium, which was followed by the nanoprecipitation technique using dimethylformamide as a solvent and deionized water as an antisolvent. The successful graft polymerization was verified by 1H-nuclear magnetic resonance (NMR), 31P-NMR, and Fourier transform infrared (FTIR) analyses; and the grafting yield of the generated KL-AA-MMA copolymer ranged from 68.2% to 96.5%. Transmission electron microscopy (TEM) observation revealed the formation of amorphous KL-AA-MMA nanoparticles. Additionally, KL-AA-MMA9 nanoparticles with the highest yield exhibited the minimum hydrodynamic diameter and polydispersity of 261 nm and 0.153, respectively. Moreover, the amphiphilicity of KL-AA-MMA nanoparticles was significantly improved by the grafting of MMA monomers. Finally, the adsorption performance of KL-AA-MMA nanoparticles at the xylene interface was evaluated by a quartz crystal microbalance with dissipation (QCM-D). The results demonstrated that the most amphiphilic sample, KL-AA-MMA9 nanoparticles, with the smallest hydrodynamic size displayed the highest adsorption on the oil/water interface. This product provides a wide range of applications in oil/water emulsions.
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Mishra, Pawan Kumar, and Adam Ekielski. "The Self-Assembly of Lignin and Its Application in Nanoparticle Synthesis: A Short Review." Nanomaterials 9, no. 2 (February 11, 2019): 243. http://dx.doi.org/10.3390/nano9020243.
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Lignin serves as a significant contributor to the natural stock of non-fossilized carbon, second only to cellulose in the biosphere. In this review article, we focus on the self-assembly properties of lignin and their contribution to its effective utilization and valorization. Traditionally, investigations on self-assembly properties of lignin have aimed at understanding the lignification process of the cell wall and using it for efficient delignification for commercial purposes. In recent years (mainly the last three years), an increased number of attempts and reports of technical-lignin nanostructure synthesis with controlled particle size and morphology have been published. This has renewed the interests in the self-assembly properties of technical lignins and their possible applications. Based on the sources and processing methods of lignin, there are significant differences between its structure and properties, which is the primary obstacle in the generalized understanding of the lignin structure and the lignification process occurring within cell walls. The reported studies are also specific to source and processing methods. This work has been divided into two parts. In the first part, the aggregation propensity of lignin based on type, source and extraction method, temperature, and pH of solution is discussed. This is followed by a critical overview of non-covalent interactions and their contribution to the self-associative properties of lignin. The role of self-assembly towards the understanding of xylogenesis and nanoparticle synthesis is also discussed. A particular emphasis is placed on the interaction and forces involved that are used to explain the self-association of lignin.
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Adamcyk, Johannes, Stefan Beisl, Samaneh Amini, Thomas Jung, Florian Zikeli, Jalel Labidi, and Anton Friedl. "Production and Properties of Lignin Nanoparticles from Ethanol Organosolv Liquors—Influence of Origin and Pretreatment Conditions." Polymers 13, no. 3 (January 26, 2021): 384. http://dx.doi.org/10.3390/polym13030384.
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Despite major efforts in recent years, lignin as an abundant biopolymer is still underutilized in material applications. The production of lignin nanoparticles with improved properties through a high specific surface area enables easier applicability and higher value applications. Current precipitation processes often show poor yields, as a portion of the lignin stays in solution. In the present work, lignin was extracted from wheat straw, spruce, and beech using ethanol organosolv pretreatment at temperatures from 160–220 °C. The resulting extracts were standardized to the lowest lignin content and precipitated by solvent-shifting to produce lignin micro- and nanoparticles with mean hydrodynamic diameters from 67.8 to 1156.4 nm. Extracts, particles and supernatant were analyzed on molecular weight, revealing that large lignin molecules are precipitated while small lignin molecules stay in solution. The particles were purified by dialysis and characterized on their color and antioxidant activity, reaching ASC equivalents between 19.1 and 50.4 mg/mg. This work gives detailed insight into the precipitation process with respect to different raw materials and pretreatment severities, enabling better understanding and optimization of lignin nanoparticle precipitation.
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Fal, Jacek, Katarzyna Bulanda, Julian Traciak, Jolanta Sobczak, Rafał Kuzioła, Katarzyna Maria Grąz, Grzegorz Budzik, Mariusz Oleksy, and Gaweł Żyła. "Electrical and Optical Properties of Silicon Oxide Lignin Polylactide (SiO2-L-PLA)." Molecules 25, no. 6 (March 16, 2020): 1354. http://dx.doi.org/10.3390/molecules25061354.
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This paper presents a study on the electrical properties of new polylactide-based nanocomposites with the addition of silicon-dioxide–lignin nanoparticles and glycerine as a plasticizer. Four samples were prepared with nanoparticle mass fractions ranging between 0.01 to 0.15 (0.01, 0.05, 0.10, and 0.15), and three samples were prepared without nanoparticle filler—unfilled and unprocessed polylactide, unfilled and processed polylactide, and polylactide with Fusabond and glycerine. All samples were manufactured using the melt mixing extrusion technique and injection molding. Only the unfilled and unprocessed PLA sample was directly prepared by injection molding. Dielectric properties were studied with broadband spectroscopy in a frequency range from 0.1 Hz to 1 MHz in 55 steps designed on a logarithmic scale and a temperature range from 293.15 to 333.15 K with a 5 K step. Optical properties of nanocomposites were measured with UV-VIS spectroscopy at wavelengths from 190 to 1100 nm. The experimental data show that the addition of silicon-dioxide–lignin and glycerine significantly affected the electrical properties of the studied nanocomposites based on polylactide. Permittivity and electrical conductivity show a significant increase with an increasing concentration of nanoparticle filler. The optical properties are also affected by nanofiller and cause an increase in absorbance as the number of silicon-dioxide–lignin nanoparticles increase.
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Matsakas, Leonidas, Anthi Karnaouri, Andrzej Cwirzen, Ulrika Rova, and Paul Christakopoulos. "Formation of Lignin Nanoparticles by Combining Organosolv Pretreatment of Birch Biomass and Homogenization Processes." Molecules 23, no. 7 (July 23, 2018): 1822. http://dx.doi.org/10.3390/molecules23071822.
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Valorization of lignocellulosic biomass into a biorefinery scheme requires the use of all biomass components; in this, the lignin fraction is often underutilized. Conversion of lignin to nanoparticles is an attractive solution. Here, we investigated the effect of different lignin isolation processes and a post-treatment homogenization step on particle formation. Lignin was isolated from birch chips by using two organosolv processes, traditional organosolv (OS) and hybrid organosolv-steam explosion (HOS-SE) at various ethanol contents. For post-treatment, lignin was homogenized at 500 bar using different ethanol:water ratios. Isolation of lignin with OS resulted in unshaped lignin particles, whereas after HOS-SE, lignin micro-particles were formed directly. Addition of an acidic catalyst during HOS-SE had a negative impact on the particle formation, and the optimal ethanol content was 50–60% v/v. Homogenization had a positive effect as it transformed initially unshaped lignin into spherical nanoparticles and reduced the size of the micro-particles isolated by HOS-SE. Ethanol content during homogenization affected the size of the particles, with the optimal results obtained at 75% v/v. We demonstrate that organosolv lignin can be used as an excellent starting material for nanoparticle preparation, with a simple method without the need for extensive chemical modification. It was also demonstrated that tuning of the operational parameters results in nanoparticles of smaller size and with better size homogeneity.
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Lievonen, Miikka, Juan José Valle-Delgado, Maija-Liisa Mattinen, Eva-Lena Hult, Kalle Lintinen, Mauri A. Kostiainen, Arja Paananen, Géza R. Szilvay, Harri Setälä, and Monika Österberg. "A simple process for lignin nanoparticle preparation." Green Chemistry 18, no. 5 (2016): 1416–22. http://dx.doi.org/10.1039/c5gc01436k.
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Wijaya, Christian J., Suryadi Ismadji, and Setiyo Gunawan. "A Review of Lignocellulosic-Derived Nanoparticles for Drug Delivery Applications: Lignin Nanoparticles, Xylan Nanoparticles, and Cellulose Nanocrystals." Molecules 26, no. 3 (January 28, 2021): 676. http://dx.doi.org/10.3390/molecules26030676.
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Due to their biocompatibility, biodegradability, and non-toxicity, lignocellulosic-derived nanoparticles are very potential materials for drug carriers in drug delivery applications. There are three main lignocellulosic-derived nanoparticles discussed in this review. First, lignin nanoparticles (LNPs) are an amphiphilic nanoparticle which has versatile interactions toward hydrophilic or hydrophobic drugs. The synthesis methods of LNPs play an important role in this amphiphilic characteristic. Second, xylan nanoparticles (XNPs) are a hemicellulose-derived nanoparticle, where additional pretreatment is needed to obtain a high purity xylan before the synthesis of XNPs. This process is quite long and challenging, but XNPs have a lot of potential as a drug carrier due to their stronger interactions with various drugs. Third, cellulose nanocrystals (CNCs) are a widely exploited nanoparticle, especially in drug delivery applications. CNCs have low cytotoxicity, therefore they are suitable for use as a drug carrier. The research possibilities for these three nanoparticles are still wide and there is potential in drug delivery applications, especially for enhancing their characteristics with further surface modifications adjusted to the drugs.
Dissertations / Theses on the topic "Lignin nanoparticle"
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Linder, Kristoffer. "Optical Characterization of Lignin Nanoparticles." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79864.
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Lignin is one of the main components of wood and plants that acts as a kind of glue providing mechanical strength. It is a main polymer component composed from three phenolic structures, i.e. p-hydroxyphenyl (H), guaiacyl (G) and syringyl (S) units. It currently draws a lot of attention due to its eco-friendly. Recently, it has been shown that it is possible to produce lignin nanoparticles, small spherical particle that are composed out of lignin, that could possibly be used to replace the hazardous silver nanoparticles that are today used frequently in numerous applications. Lignin nanoparticles could potenitally also be used as functional coatings, as well as biologically degradable adhesives and float switches. Five samples, of nanoparticles, were investigated in this study. The first contained pure lignin nanoparticles, the second pure silver nanoparticles, and the three remaining samples contained lignin-coated silver nanoparticles, extracted from acetone, tetrahydrofuran (THF), and dimetylformamid (DMF) solvents. All samples were characterized using spectroscopic methods, e.g. infrared- and dark-field imaging, as well as UV-Vis-, fluorescence-, and Raman spectroscopy. In this thesis it was shown that lignin-coated silver nanoparticles exhibit surface plasmon resonance which induces a heat effect upon infrared irradiation. To identify the phenolic structures of lignin, UV-Vis spectroscopy was used. It was found that the spectra of the samples exhibited several intense bands. The objective of the UV-Vis spectroscopy was to examine the absorbance characteristics of the lignin-coated silver nanoparticles. Possible surface plasmon resonance wavelengths were determined, and two of the phenolic structures were identified. In this study, Raman spectroscopy was used to define characteristic bands of the samples. This was done to investigate if the lignin nanoparticles have the same characteristics as bulk lignin. Raman spectroscopy provide structural information of lignin. Furthermore, p-hydroxyphenyl, guaiacyl and syringyl structures could be identified with an excitation wavelength of 532nm. A comparison of the spectra of the lignin-containing samples indicated the the Raman features of the specimens were similar meanwhile almost no signs of silver were present, which might show that the particles were fully covered with lignin. Main lignin bands were identified and assigned. The fluorescent properties of the nanoparticles were investigated by obtaining emission spectra for blue-, green- and UV light excitation. The spectra were deconvoluted into their Gaussian components. Emission spectra were obtained for blue-, green- and UV light excitation. It was found that the fluorescence, after UV light exposure, increased with time of exposure. Dark-field microscopy was used to generate light scattering images of the particles. As a result, optical images with different colors (white, yellow, blue and red) could be revealed. The color information, that is related to the size of the particles, was used to estimate ratios of the different particle sizes. The lignin-coated silver nanoparticles, extracted from acetone, exhibited a strong surface plasmon resonance effect, which could be due to the absorbance at 463nm. The lignin-coated silver nanoparticles, extracted from DMF, exhibited a medium surface plasmon resonance effect, which could be due to the absorbance at 362nm. The lignin-coated silver nanoparticles, extracted from the THF solvent, exhibited a weak surface plasmon resonance effect, which could be due to the absorption at 379-380nm. The pure lignin- and silver nanoparticles merely showed bulk heating but no surface plasmon resonance effect could be detected.Lignin är en av huvudbeståndsdelarna av trä och plantor som fungerar likt ett lim som ger mekanisk styrka. Lignin är en biopolymer, som består av tre fenylgrupper: p-hydroxifenyl (H), guaiacyl (G) och syringyl (S). På senaste tid har det visat sig att det är möjligt att tillverka lignin nanopartiklar, det är små sfäriska partiklar som är helt gjorda av lignin, som skulle kunna ersätta de miljöfarliga silver nanopartiklarna som i nuläget används i många olika tillämpningar. Lignin nanopartiklar kan potentiellt också användas som funktionella ytbeläggningar, såväl som biologiskt nedbrytbara lim och flottörer. Fem prover, av nanopartiklar, undersöktes i denna studie. Det första provet innehöll lignin nanopartiklar, det andra silver nanopartiklarna, och de tre återstående proverna innehöll ligninbelagda silver nanopartiklar, extraherade från aceton, tetrahydrofuran (THF) och dimetylformamid (DMF). Alla prover karakteriserades med hjälp av spektroskopiska metoder: infraröd- och mörkfältavbildning, liksom UV-Vis-, fluorescens- och Ramanspektroskopi. I denna avhandling visades att ligninbelagda silver nanopartiklar uppvisar ytplasmonsresonans, vilket inducerar en värmeeffekt vid infraröd bestrålning. För att identifiera ligninets fenylgrupper användes UV-Vis-spektroskopi. Det visade sig att spektra från proverna uppvisade flera intensiva band. Målet med UV-Vis-spektroskopin var att undersöka absorptionsegenskaperna hos de ligninbelagda silvernanopartiklarna. Möjliga ytplasmonresonansvåglängder bestämdes och två av fenylgrupperna identifierades. I denna studie användes Ramansspektroskopi för att definiera karakteristiska band för proverna. Detta gjordes för att undersöka om lignin nanopartiklarna har samma egenskaper som bulk lignin. Ramanspektroskopi ger information om ligninets struktur. Vidare identigierades p-hydroxifenyl-, guaiacyl- och syringylstrukturerna med en excitationsvåglängd på 532nm. En jämförelse av spektra för de lignininnehållande proverna indikerade att provernas Raman-kännetecken var liknande medan nästan inga tecken på silver fanns, vilket kan visa att partiklarna var täckta med lignin. Huvudsakliga ligninband kunde identifieras. Fluorescensegenskaperna, hos nanopartiklarna, undersöktes genom de erhållna emissionspektra efter exponering av blå-, grön- och UV-ljus. De erhållna spektra dekonvoluterades till dess gaussiska komponenter. Det visade sig att fluorescensen, efter exponering av UV-ljus, ökade med exponeringstiden. Mörkfältmikroskopi användes för att generera bilder på partiklarna. De resulterade i bilder med olika färger (vitt, gult, blått och rött) som motsvarade olika partikelstorlekar och geometrier. På så sätt kunde färhållandena mellan de olika partikelstorlekarna uppskattas. De ligninbelagda silver-nanopartiklarna, extraherade från aceton-lösningen, uppvisade en stark ytplasmonresonanseffekt, vilket kan bero på absorptionen (från absorptionsspektrat) vid 463nm. De ligninbelagda silver-nanopartiklarna, extraherade från DMF-lösningen, uppvisade en medelstark ytplasmonresonanseffekt, vilket kan bero på absorptionen vid 362nm. De ligninbelagda silver-nanopartiklarna, extraherade från THF-lösningen, uppvisade en svag ytplasmonresonanseffekt, vilket kan bero på absorptionen vid 379-380nm. De rena lignin- och silver-nanopartiklarna uppvisade endast uppvärmning men ingen ytplasmonresonanseffekt.
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FERRUTI, FEDERICA MARIA CAMILLA. "NEW FUNCTIONALIZATION APPROACHES OF LIGNOCELLULOSIC FEEDSTOCK TO OBTAIN NEW REINFORCING FILLERS TAILORED TO RUBBER COMPOUNDS." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/403897.
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Manufatti in gomma trovano una gran varietà di impieghi tecnologicamente rilevanti. Le proprietà meccaniche della gomma di per sé non sono soddisfacenti per le applicazioni desiderate quindi i miglioramenti necessari sono comunemente ottenuti tramite vulcanizzazione e addizione di filler rinforzanti nella matrice elastomerica. Il filler rinforzante più comune è il nero fumo il cui uso è tuttavia associato a problemi per la salute e l’ambiente. Per questa ragione molti produttori di pneumatici stanno concentrando i propri sforzi per la sostituzione del nero fumo con alternative più sostenibili. Le loro ambizioni includono l’incremento di materiali rinnovabili e la simultanea riduzione di composti derivanti da carbonfossile nella formulazione di pneumatici, contemporaneamente preservando o migliorando le proprietà meccaniche. In questo contesto il presente progetto di ricerca si è concentrato sullo sviluppo di filler rinforzanti sostenibili per compositi elastomerici in alternativa alle tecnologie legate all’industria del petrolio, con una particolare attenzione alla lignina. Nonostante la sua disponibilità a livello industriale, la complessità strutturale della lignina ha impedito la sua conversione in prodotti ad alto valore aggiunto e la progettazione razionale di materiali funzionali. Questo materiale può essere considerato una valida alternativa al nerofumo nei compositi elastomerici per le sue proprietà chimico-fisiche, le proprietà meccaniche, l’attività antiossidante e la stabilità termica. La sua combinazione con una matrice elastomerica comporta la necessità di superare la scarsa compatibilità tra i due materiali associata alla polarità della lignina che dà luogo a forti interazioni con se stessa. È stato necessario modificare la lignina per migliorare il numero e la qualità delle sue interazioni con la gomma al fine di ottenere un rinforzo meccanico della stessa. Per assicurare il rinforzo desiderato si sono esplorate e due strategie. La prima si è focalizzata sulla funzionalizzazione dei gruppi ossidrili della lignina, puntando alla formazione di legami covalenti tra la lignina stessa e la matrice gommosa durante la vulcanizzazione. È stata messa a punto una procedura innovativa per l’esterificazione meccanochimica della lignina che ha consentito di eseguire la reazione allo stato solido, avvantaggiandosi dell’energia meccanica per indurre trasformazioni chimiche, evitando l’uso di solventi organici, limitando le procedure di workup e riducendo la produzione di rifiuti rispetto alle strategie di sintesi in soluzione. Il secondo approccio è consistito nella formulazione di nanoparticelle di lignina (LNP) che sono note esibire proprietà uniche a causa del loro alto rapporto tra area superficiale e volume. Studi analitici riguardo frazioni estratte con solventi organiche hanno guidato la scelta di specifiche frazione di lignina per lo sviluppo di nanoparticelle con caratteristiche peculiari. La procedura innovativa sviluppata ha permesso di valorizzare tutto la lignina kraft di partenza in maniera efficiente. È stato possibile produrre LNP con una provata stabilità dimensionale in un ampio intervallo di pH (4,5-12) , valori ai quali normalmente la lignina si aggrega o dissolve. Lo stesso approccio ha consentito di preparare LNP specificamente funzionalizzate in maniera covalente alla superficie, un risultato mai ottenuto in letteratura al meglio delle nostre conoscenze. La messa appunto e lo scale up di queste procedure hanno permesso la formulazione di compositi elastomerici, seguito dalla valutazione delle proprietà dinamomeccaniche di una varietà di compositi che includevano lignina modificata. I risultati intriganti si sono dimostrati promettenti per lo sviluppo di compositi elastomerici tecnologicamente competitivi contenenti materiali rinnovabili.Rubber products are commonly employed in a wide variety of industries including tire manufacturing, packaging, engineering and construction. The mechanical performances of rubber itself are unsatisfactory for the desired applications so the necessary improvements are commonly obtained by vulcanization and addition of reinforcing fillers in the elastomeric matrix. The most popular reinforcing filler is carbon black whose use is however associated with health and environmental concerns. For this reason, many tire manufacturers are concentrating their efforts in replacing carbon black with more sustainable alternatives. Their ambitions include the increment of renewable materials and the simultaneous reduction of fossil-based compounds in tire formulations, while preserving pr improving mechanical performances. In this frame, the present research project dealt with the development of sustainable reinforcing fillers for rubber compounds in alternative to fossil-based technologies with a particular focus on lignin. Despite its availability at industrial scale, the structural complexity of lignin has hampered its conversion into value-added products and the rational design of functional materials. However, the concerns about toxicity and environmental concerns related to the use of fossil-based materials are eliciting investigations regarding the use of renewable resources, included lignin. This material could be considered as a valuable alternative to carbon black in rubber compounds due to its good physical chemical and mechanical properties, antioxidant activity and thermal stability. However, its combination with an elastomeric matrix requires overcoming the poor compatibility between the two materials related to the polarity of lignin which results into strong self-interactions. So, it was necessary to modify lignin in order to improve the number and quality of its interaction with rubber resulting in a reinforcing effect. To ensure the desired reinforcement, two strategies were explored in the present project. The former dealt with the functionalisation of lignin hydroxyl groups ensuring the formation of covalent bonds between lignin and the rubber matrix during vulcanization. The procedure consisted in the mechanochemical esterification of lignin, allowing running reactions in the solid state, taking advantage of mechanical energy to trigger chemical transformations, avoiding organic solvents, limiting work-up procedures and reducing wastes with respect to wet chemistry syntheses. The latter consisted in the formulation of lignin into nanoparticles (LNPs)which are acknowledged to exhibit unique properties due to their high surface to volume ratio. Analytical investigations about solvent-extracted fractions guided the choice of specific lignin fractions for the development of LNPs with peculiar features. The innovative procedure allowed valorising the whole starting kraft lignin in a material efficient manner. It was possible to produce LNPs which proved dimensionally stable in a broad pH range 4.5-12.0 where lignin normally aggregates or dissolves The same approach allowed preparing LNPs with a surface-specific covalent functionalisation, an achievement never attempted in literature, to the best of our knowledge. The setup and scaleup of those procedures allowed for the formulation of innovative rubber compounds followed by the assessment of their dynamic-mechanical properties. The intriguing results proved promising for the development of technologically valuable and competitive rubber compounds including renewable materials.
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la, Placa Antonia. "Comparison of Miscanthus grass lignin with spruce lignin from organosolv process for nanoparticles production." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278835.
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There is a growing global energy demand and the society is forced to shift towards renewable energy sources due to the depletion of fossil fuels. Lignocellulosic biomass is a renewable resource available in vast amounts and could therefore have the potential to become a primary source for fuel production. Lignin, as a substantial part of the biomass, is underutilized due to its complex structure which can limit the potential of applying lignin towards value- adding products. However, one way to promote lignin valorization is to produce lignin nanoparticles (LNPs) that are considered valuable in the biomedical field. The aim of this report was to investigate if different botanical origins will affect the properties of LNPs, such as size, polydispersity index, 𝜁-potential and morphology. LNPs from Miscanthus sinensis grass lignin, obtained by the organosolv process, was successfully produced via solvent exchange and compared with LNPs from spruce organosolv lignin. The experimental part resulted in Miscanthus LNPs ranging from 133.7 to 377.4 nm, where a higher initial concentration yielded larger particles, and the average ζ- potential was -38.7 mV. This work has shown that the botanical origin will affect both size and shape of LNPs produced with the same method. Miscanthus LNPs were larger in size and ellipsoidal in shape compared to the spherical spruce LNPs. The lignin concentration influenced the particle size for both origins and the difference in LNP size became more significant as the concentration increased. However, to only explore two different types of plant origins is not sufficient enough to reach a general conclusion. Also, there are many influential steps from plant origin to LNP and to reach a more generalized conclusion, it is arguable that there is a necessity to explore and determine both the applied pulping method, the process to isolate the lignin and the method used to produce the LNPs.Det globala energibehovet ökar och samhället tvingas därmed att växla till förnybara resurser eftersom de fossila bränslena kan ta slut. Biomassa är en förnybar resurs som finns tillgänglig i stora mängder och kan därför bli en potentiell primär energikälla. Lignin, som är en väsentlig del av biomassan, används inte i lika stor utsträckning på grund av dess komplexa struktur. Komplexiteten begränsar därför användandet av lignin i värdeskapande produkter. Men en väg för att ta tillvara på lignins värdefulla egenskaper kan vara framställandet av nanopartiklar (NP), vilket öppnar upp för användning av lignin inom det biomedicinska fältet. Syftet med den här rapporten är att undersöka om lignin från olika botaniska ursprung påverkar nanopartiklarnas egenskaper, som exempelvis storlek, polydispersitet, 𝜁-potential och morfologi. NP av lignin från gräsarten Miscanthus sinensis framställdes genom solvent exchange och jämfördes sedan med NP från granlignin. Både miscanthus- och granligninet var isolerat genom organosolvprocessen. Den experimentella delen av arbetet visade att NP from miscanthuslignin gav partiklar inom intervallet 133.7 to 377.4 nm, där högre koncentration gav större partiklar, och medelvärdet för 𝜁-potentialen var -38.7 mV. Resultatet från arbetet visade att det botaniskt ursprunget påverkar både storleken och formen på NP av lignin som framställts med samma metod. NP från miscanthuslignin var större och hade en mer elliptisk form, i jämförelse med de mer sfäriska partiklarna från granlignin. Ligninkoncentrationen påverkade partikelstorleken för båda typerna av lignin, dessutom blev skillnaden i partikelstorlek större när koncentrationen ökade. Däremot var det svårt att dra någon generell slutsats genom att bara undersöka två olika ursprung. Eftersom det finns flera steg i processen från växters ursprung till NP av lignin som kan påverka partiklarnas egenskaper kan det vara nödvändigt att utforska både den tillämpade massaprocessen, isoleringsmetoden och metoden som används för att framställa NP av lignin.
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Wessén, Anna, Eliot Diklev, and Lejla Al-Tamimi. "Development of magnetic lignin nanoparticles from low-molecular-weight eucalyptus and spruce lignin fractions." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277112.
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Lignin is one of the most common biopolymers in the world. Together with cellulose andhemicellulose it constitutes the fibers in the wood. It has a high molecular weight due to its complexstructure consisting of crossed-linked phenolic monomers and is concatenated with different types ofcarbon and ether bonds.In pulping processes, lignin is extracted in large quantities and used on site to produce energy for milloperations but is also removed as a waste product. This enables a product with high resources andaccessibility due to lignin's diverse properties. Therefore, lignin has the potential to be utilized inhigher value applications such as polymer materials, as well as a source of platform chemicals. Atpresent, the value applications of lignin are promising as additives for different kinds of productssuch as emulsifiers and especially as biofuel due to lignin's high carbon content.New technologies for development for utilization lignin are emerging for different kinds ofapplications due to lignin’s biocompatibility. The possibilities of lignin combined with existingresearch of nanotechnology gives opportunities to improve biomedical applications. By designinglignin derived nanoparticles with incorporated magnetic materials, the NPs obtainsuperparamagnetic properties which can be utilized for target drug delivery. This could be promisingagainst intractable cancer such as pancreatic cancer.This report presents a protocol for developing magnetic lignin nanoparticles from the lowestmolecular weight kraft lignin fractions of eucalyptus (hardwood) and spruce (softwood). By a methodof self-assembly, particles with a doughnut and core-shell morphology, as indicated by SEM and TEM,were yielded with a 10-50μL content of water-stabilized magnetite. The particle size distribution andzeta potential were determined by DLS and the possibility of the particles being suitable forbiomedical applications was discussed.
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Chollet, Benjamin. "Étude du comportement au feu de matériaux polymères contenant des bio-nanoparticules fonctionnalisées." Thesis, IMT Mines Alès, 2018. http://www.theses.fr/2018EMAL0004/document.
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La volonté croissante de diminuer l’empreinte écologique des matières plastiques favorise le développement de polymères et d’additifs issus de ressources renouvelables afin de limiter leur impact environnemental. Les retardateurs de flamme sont une famille d’additifs qui jouent un rôle crucial dans de nombreux domaines d’application où le risque d’incendie est avéré. Cette étude vise donc à développer de nouveaux systèmes retardateurs de flamme à partir de composés issus de la biomasse afin d’améliorer le comportement au feu d’un polymère bio-sourcé, l’acide polylactique (PLA). La lignine et la cellulose ont été choisies comme composés de base. Des procédés adaptés ont permis de transformer ces composés à l’état nanoparticulaire, puis ils ont été fonctionnalisés avec des produits phosphorés ou alors mélangés avec du polyphosphate d’ammonium, et incorporés dans l’acide polylactique au mélangeur interne. La stabilité thermique, l’inflammabilité et le comportement au feu des composites ainsi obtenus ont été étudiés. Les résultats obtenus avec certains systèmes sont prometteursThe growing desire to reduce the ecological footprint of plastic materials promotes the development of polymers and additives from renewable resources in order to limit their environmental impact. Flame retardants represent an important family of additives that play a crucial role in many fields where fire hazard is encountered. Thus this study aims at developing new flame retardant systems from biomass compounds to improve the fire behavior of polylactide (PLA), a bio-based polymer. Lignin and cellulose were chosen as pristine compounds. These compounds have been transformed into nanoparticles with adapted processes. Then, they were functionalized with phosphorous moieties or mixed with ammonium polyphosphate, and incorporated into polylactide with in internal mixer. Thermal, flammability and fire properties of these compounds were evaluated. The results obtained with some systems are promising
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Petrie, Frankie Ann. "Magnetic-lignin Nanoparticles as Potential Ethanol Extractants from Aqueous Solutions." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1563285930072497.
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Guthenberg, Kristoffer. "The impact of the pulping process on the properties of lignin nanoparticles." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278834.
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Lignin valorization is a key component of the total utilization of biomass in the biorefinery industry. Lignin has seen some use in several different applications, but a breakthrough is still yet to happen, and there is still a need to find more areas where lignin can be used as an alternative feedstock or as the main component. Lignin nanoparticles (LNPs) could be an alternative route towards lignin valorization offering many areas of application. However, research around LNPs still has to overcome many challenges, primarily related to the complex structure of lignin, with composition and structure of lignin depending on its botanical origin and on the pulping process used to isolate the lignin from other components in biomass. This study investigates how spruce lignin originating from Kraft and Organosolv pulping will affect the properties of lignin nanoparticles. Particles from organosolv spruce lignin were prepared using a solvent exchange method with acetone/water as solvent and water as antisolvent. This resulted in spherical LNPs with hollow centers, sizes ranging from 104.6- 270.3 depending on initial lignin concentration and average zeta-potential of -35mV. Comparing Organosolv LPN’s with Kraft LNPs produced with the same experimental procedure, reviled that Organosolv LNPs were larger in and had lower absolute zeta potential, presumably due to the kraft lignin having higher phenolic-OH content. Furthermore, a larger comparison is made with LNPs from previous studies which indicated that LNP properties are further dependant Mw of lignin raw material, phenolic-OH content, and the method applied to produce the particles. In conclusion, this study proves that the pulping process used to isolate lining will affect the properties of NPs. But to strengthen and generalize this conclusion beyond the limitations of this study, more experimental data are needed, to further investigate the relationship between LNP properties and the properties of lignin raw material.En av utmaningarna för framtidens bioraffinaderier är att fullständigt utnyttja samtliga komponenter av råvaran. Historiskt sett har cellulosa varit den mest värdefulla komponenten av biomassan medan lignin har klassats som en biprodukt och har därför primärt bränts som bränsle vid framställning av pappersmassa. Även om lignin produceras på industriell skala saknas idag värdeskapande applikationsområden där lignin kan utnyttjas ur ett ekonomiskt hållbart perspektiv. Ett alternativ till valorisering av lignin är att använda det som råmaterial för framställande av nanopartiklar , vilket är ett relativ nytt område med stor potential framförallt inom biomedicin. Dock kvarstår en del utmaningar i forskningen runt lignin nanopartiklar. Framförallt relaterat till lignins komplexa och inhomogena struktur, som varierar beroende på botaniskt ursprung och vilken typ av massaframställningsprocess som används för att isolera ligninet från biomassan. Den här studien undersöker hur granlignin från två olika massaframställningsprocesser, Organosolv- och Kraftprocessen, påverkar egenskaper hos NP av lignin. Under den experimentella delen av arbetet framställdes NP från Organosolv granlignin, vilket resulterade i sfäriska och ihåliga partiklar som varierade i storlek mellan 104.5–270.3 nm, beroende på den initiala lignin koncentrationen, samt en genomsnittlig zeta potential kring -35 mV. Egenskaperna hos Organosolv nanopartiklarna som jämfördes med nanopartiklar av Kraflignin som producerats med samma metod. Slutsatsen drogs att organosolv partiklar var större och hade lägre absolut zeta-potential. Vilket troligtvis kan förklaras med den betydligt högre halten av fenoliska-OH enheter i Kraft ligninet. En bredare jämförelse med tidigare studier som producerat olika lignin nanopartiklar visar dessutom att molekylvikten, fenolisk-OH halt och produktionsmetoden, är bidragande faktorer till lignin nanopartiklars egenskaper. Sammanfattnings visar den här studien att den massaframställningsprocess som används för att isolera lignin kommer påverka egenskaperna hos lignin nanopartiklar. Men för att kunna generalisera och stärka slutsatsen krävs dock utökad experimentella, för att vidare undersöka hur lignin nanopartiklars egenskaper beror på egenskaperna hos ligninet som använts för att producera partiklarna.
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Nunes, Andreia. "Hybrid mesoporous materials for the oxidative depolymerization of lignin into valuable molecules." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1024.
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La lignine est un des polymères naturels les plus abondants et le seul constituant de la biomasse basé sur des unités aromatiques et, à ce titre, représente une ressource renouvelable prometteuse pour la production durable de molécules organiques plus complexes. Les travaux de cette thèse portent sur le développement de matériaux catalytiques capables de transformer sélectivement la lignine en molécules fonctionnelles de base, hautement oxygénées, et l'étude de leur mise en oeuvre en condition alcaline oxydante en utilisant le peroxyde d'hydrogène comme donneur d'oxygène. Différentes familles de matériaux hybrides de type SBA-15 à base de titane, Au/titane, Ag/titane et Fe(TAML) ont tout d'abord été synthétisées et entièrement caractérisées. Des études catalytiques comparatives ont ensuite été réalisées afin d'évaluer leurs performances en termes de degré de dépolymérisation et distribution de produits. Le catalyseur présentant le plus fort potentiel, le matériau TiO2 supporté sur SBA-15, a ensuite été soumis à des études de réactivité plus poussées afin d'optimiser les différents paramètres réactionnels (température, temps de réaction et quantité d'oxydant) permettant d'atteindre en présence d'un excès d'oxydant jusqu'à 90 %pds de conversion de la lignine et à 80°C un rendement en bio-huile de 50%pds constituée principalement d'acides carboxyliques et molécules aromatiques potentiellement valorisablesLignin is one of the most abundant natural polymers and the only biomass constituent based on aromatic units and as such represents a promising renewable resource for the sustainable production of complex organic molecules. This dissertation reports on the development of catalytic materials capable of selectively transform lignin into basic functional molecules with high oxygen content and the study of their performance under alkaline oxidative conditions, using hydrogen peroxide as oxygen donner. Different families of hybrid materials based on the SBA-15 scaffold were first synthesized by incorporation of titanium, Au/titanium, Ag/titanium and Fe-TAML and completely characterized. Comparative catalytic studies were then accomplished in order to evaluate their performance in terms of degree of depolymerization and product distribution. The catalyst with the highest potential, the TiO2 based SBA-15 material, was then submitted to further reactivity studies in order to optimize the different reaction parameters (temperature, reaction time and quantity of oxidant). In the presence of an excess of oxidant, conversions up to 90 wt. % were obtained, whereas a temperature of 80 °C allowed to obtain a yield in bio-oil of 50 wt. %, which is mainly composed of carboxylic acids and aromatic molecules with potential to be further valorized
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Marchand, Guillaume. "Synthèse et caractérisations de matériaux photosensibles à partir de lignines - Vers une utilisation en Traitement Photodynamique Antimicrobien appliqué à l'agronomie." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0108/document.
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La surexploitation des ressources de la planète est aujourd’hui une problématique de premier ordre, et fait du remplacement des sources non renouvelables, d'énergie et de matières premières, l’un des défis majeurs du XXIe siècle. Dans cet objectif, les lignines, par leur disponibilité et leur biocompatibilité, apparaissent comme l’une des alternatives aux ressources fossiles. C’est dans ce contexte que le Laboratoire PEIRENE a décidé de mener ce travail de thèse portant sur le développement de nouveaux matériaux photosensibles à base de lignines modifiées. Dans ce but, trois lignines d’origines différentes ont été acétylées. Leur étude par spectroscopie RPE a révélé que le blocage de leurs fonctions antioxydantes augmente considérablement la quantité d’espèces réactives de l’oxygène qu’elles sont capables de générer sous irradiation lumineuse, permettant ainsi d’envisager l’utilisation de ce biopolymère modifié dans de nombreux domaines tels que le traitement photodynamique antimicrobien. Afin de les rendre hydrodispersibles et d’élargir ainsi leur champ d’applications, ces matériaux aux propriétés prometteuses ont été mis sous forme de nanoparticules puis, leur comportement photosensible a été lui aussi évalué par spectroscopie RPE. Il a ainsi été démontré qu’une fois dispersées dans l’eau sous la forme de nanoparticules, les lignines acétylées étaient toujours capables de produire de l’oxygène singulet sous irradiation lumineuse. Cette activité, qui n’a pas encore été reportée dans la littérature à notre connaissance, reste cependant assez restreinte et nécessite donc d’être améliorée. Afin d’élargir le domaine du spectre solaire permettant leur activation, un photosensibilisateur a par ailleurs été associé à ces nano-objets par encapsulation et par greffage covalent. L’ensemble des résultats découlant de ces travaux permettent d’envisager le développement de systèmes à base de nanoparticules de lignines acétylées dans de nombreux domaines, notamment pharmaceutique et phytosanitaireThe overexploitation of the planet's resources is nowadays a major problem and makes the replacement of non-renewable sources of energy and raw materials, one of the major challenges of the XXIe century. For this purpose, lignins, by their availability and their biocompatibility, appear as one of the alternatives to fossil resourcesIn this context, the PEIRENE Laboratory decided to carry out this PhD work on the development of new photosensitive materials based on modified lignins. For this purpose, three lignins from different origin were acetylated. Their study by EPR spectroscopy revealed that blocking their antioxidant functions considerably increases the quantity of reactive oxygen species they are able to generate under light irradiation. Thus it is possible to envisage the use of this modified biopolymer in many areas such as antimicrobial photodynamic therapy. In order to make them water-dispersible and thus to widen their field of applications, these materials with promising properties were put in the form of nanoparticles. Their photosensitive behavior has been also valuated by EPR spectroscopy. It has been demonstrated that once dispersed in water in the form of nanoparticles, the acetylated lignins were still capable of producing singlet oxygen under light irradiation. This activity, which has not yet been reported in the literature to our knowledge, however, remains quite limited and therefore needs to be improved. In order to widen the range of the solar spectrum allowing their activation, a photosensitizer has also been associated with these nano-objects by encapsulation and covalent grafting. The results of these studies make possible to envisage the development of systems based on acetylated lignins nanoparticles in in many field, in particular pharmaceutical and phytosanitary
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Westphal, Emily Nicole. "Lignin-Magnetite Nanoparticles Aiding in Pickering Emulsions and Oil Manipulation and Their Rheological Properties." University of Dayton / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1619710097550949.
Full textBook chapters on the topic "Lignin nanoparticle"
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Kiyanfar, Masoumeh, Hoda Daneshvar, Seyyedeh Fatemeh Hosseini, and Mir Saeed Seyed Dorraji. "Lignin Nanoparticle-Reinforced Phenolic Foams." In Phenolic Based Foams, 317–29. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-5237-0_18.
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Kumar, Raj, Abhishek Gupta, Mohit Chawla, Keshaw Ram Aadil, Sunil Dutt, Vijay Bhooshan Kumar, and Abhishek Chaudhary. "Advances in Nanotechnology based Strategies for Synthesis of Nanoparticles of Lignin." In Lignin, 203–29. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40663-9_7.
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Iravani, Siavash. "Biomedical Applications of Lignin-Based Nanoparticles." In Nanoparticles and their Biomedical Applications, 217–24. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0391-7_8.
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Nasir, Rizwan, Tazien Rashid, Khuram Maqsood, Danial Qadir, Dzeti Farhah Mohshim, Abulhassan Ali, Humbul Suleman, Hafiz Abdul Mannan, Hilmi Mukhtar, and Aymn Abdulrahman. "Lignin Nanoparticles and Their Biodegradable Composites." In Green Composites, 295–327. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9643-8_11.
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Meng, Xianzhi, Mandeep Poonia, Chang Geun Yoo, and Arthur J. Ragauskas. "Recent Advances in Synthesis and Application of Lignin Nanoparticles." In ACS Symposium Series, 273–93. Washington, DC: American Chemical Society, 2021. http://dx.doi.org/10.1021/bk-2021-1377.ch011.
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Nasrollahzadeh, Mahmoud, Zahra Nezafat, and Nasrin Shafiei. "Lignin chemistry and valorization." In Biopolymer-Based Metal Nanoparticle Chemistry for Sustainable Applications, 145–83. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-822108-2.00011-9.
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Lourenço, Ana, and Jorge Gominho. "Lignin as Feedstock for Nanoparticles Production." In Lignin - Chemistry, Structure, and Application [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109267.
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Lignin is an interesting natural polymer with characteristics that contribute for the development and growth of plants. Lignin presents high variability associated with the diversity of plants, which presents great challenges for its recovery after delignification (technical lignin), because lignin is prone to irreversible degradation, producing recalcitrant condensed structures that are difficult to disassemble afterward. Although researchers have made efforts to obtain lignin in high yields and with good characteristics for specific uses, this is not an easy task. The mind-set has changed and new biorefinery concepts are emerging, where lignin is the primary goal to achieve, and the so-called lignin-first approach has arisen. Lignin can be obtained firstly to prevent structural degradations, enabling an efficient and highly selectivity of the lignin monomers. Therefore, this concept places lignin and its valorization at the head of the biorefinery. However, lignin valorization is still a challenge, and to overcome this, lignin nanoparticles (LNPs) production presents a good way to achieve this goal. This chapter presents a resume of the several techniques to attain lignin, how to produce LNPs, and their possible applications (from pharmaceutical to the automobile and polymer industries).
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Biswas, Manik Chandra, Debjyoti Banerjee, Kowshik Saha, and Samin Anjum. "Lignin-based nanoparticles." In Biopolymeric Nanomaterials, 203–19. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-824364-0.00007-1.
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Eric, Abigail L., Adznila Eberahim, and Clarence M. Ongkudon. "Lignin nanoparticles and their biomedical applications." In Fundamentals of Bionanomaterials, 217–40. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-824147-9.00008-x.
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Moreno, Adrian, Jinrong Liu, Mohammad Morsali, and Mika H. Sipponen. "Chemical modification and functionalization of lignin nanoparticles." In Micro and Nanolignin in Aqueous Dispersions and Polymers, 385–431. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-823702-1.00003-7.
Full textConference papers on the topic "Lignin nanoparticle"
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Popović, Ana, Jelena Rusmirović, Maja Đolić, Zlate Veličković, and Aleksandar Marinković. "Lignin Based Porous, Microsphere-Shaped Adsorbent Functionalized with Magnetite Nanoparticles for Effective Chromate Anions Removal." In 34th International Congress on Process Industry. SMEITS, 2021. http://dx.doi.org/10.24094/ptk.021.34.1.133.
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Research goal of this paper represents a novel method of synthesis of an amino-modified, highly effective natural polymer adsorbent kraft lignin based, functionalized with magnetite nanoparticles, for effective removal of chromate anions from water solution. Amino-modified lignin microspheres (LMS-NM) were synthesized via inverse suspension copolymerization of kraft lignin with poly(ethylene imine) grafting-agent and epichlorohydrin cross-linker. The porous structure of the synthesized adsorbent was formed using a 5.0 wt.% sodium-alginate solution. Additional efficiency in the removal of chromium anions from water was achieved by functionalization of lignin microspheres with magnetite (NM) nanoparticles obtained by co-precipitation and additional introduction of amino groups. Structure of formed LMS-NM was confirmed via Furrier Transform Infrared (FTIR) Spectroscopy. Optical microscopy analyses showed the creation of sphere-shaped materials and showed the diameter of prepared LMS-NM in the range of 500 to 800 µm. The removal of chromate anions from water solution was performed in a batch system. The result confirmed high adsorption efficiency and potential application of this nature-based adsorbent for heavy metal anions removal. This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, as part of the following projects: 451-03-9/2021-14/200325 and 451-03-9/2021-14/200135, with the contribution of the COST Action CA17128.
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Manisekaran, Ahilan, Patrick Grysan, Benoît duez, Damien Lenoble, and Jean-Sébastien Thomann. "Green Synthesis, Mechanism, & Intrinsic Properties of Kraft Lignin Nanoparticles." In The 7th World Congress on Recent Advances in Nanotechnology. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icnnfc22.166.
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F. Piliang, Averroes, Saharman Gea, Kerista Sebayang, Dellyansyah, Suhut A. Situmorang, Noni Oktari, Siti Utari Rahayu, Rachmad Fauzi, and Denny P. Indrawan. "A Preliminary Study of Synthesized Fluorescence Carbon Nanoparticles from Lignin Residual Liquid." In The International MIPAnet Conference on Science and Mathematics (IMC-SciMath). SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0010142800002775.
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Ngamthanacom, N., N. Kaewtrakulchai, W. Chaiwat, L. Chuenchom, M. Fuji, and A. Eiad-ua. "Influence of chemical activation on synthesis of carbon nanoparticles via carbonization from lignin." In THE SECOND MATERIALS RESEARCH SOCIETY OF THAILAND INTERNATIONAL CONFERENCE. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0025937.
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