Preparation and Liquid Crystalline Properties of Spherical Cellulose Nanocrystals

Wang, Neng; Ding, Enyong; Cheng, Rongshi

doi:10.1021/la702923w

Cited by 152 publications

(90 citation statements)

References 29 publications

(47 reference statements)

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“…In fact, the liquid crystalline properties of cellulose nanocrystals are well-known and documented. 40,41 They are then locked into place once the azide and the alkyne moieties are at close proximity. Current work in our laboratory aims to further explore the concentration effects of the click precursors prior to forming the nanoplatelet gels to shed more light and elucidate the stated hypothesis.…”

Section: Tem Analysis Of Tempo-oxidized Cncs and Clickmentioning

confidence: 99%

Regular Linking of Cellulose Nanocrystals via Click Chemistry: Synthesis and Formation of Cellulose Nanoplatelet Gels

2010

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Over a number of years work in our laboratory has been developing new chemistry for the use of cellulose nanocrystals (CNCs) as scaffolds for the creation of nanomaterials with novel, stimuli responsive characteristics. Our work takes advantage of the rigid nature of CNCs, the unique nanopattern etched on their surface in the form of regularly spaced primary OH groups, and the fact that these materials have all reducing end groups located on one end. In this communication, a method for the grafting of amine-terminated monomers onto surface-modified CNCs followed by click chemistry is demonstrated. Initially the primary hydroxyl groups on the surface of the CNCs were selectively activated by converting them to carboxylic acids by the use of TEMPO-mediated hypohalite oxidation. Further reactions using the activated TEMPO-oxidized CNCs were carried out via carbodiimide-mediated formation of an amide linkage between precursors carrying an amine functionality and the carboxylic acid groups on the surface of the TEMPO-oxidized CNCs. Subsequently, two sets of CNCs were prepared, containing on their surface an azide derivative and an alkyne derivative, respectively. Finally, the click chemistry reaction, that is, the Cu(I)-catalyzed Huisgen 1,3-dipolar cycloaddition between the azide and the alkyne, surface-activated CNC was employed, bringing together the nanocrystalline materials in a unique regularly packed arrangement demonstrating a degree of molecular control for creating these structures at the nano level.

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Section: Tem Analysis Of Tempo-oxidized Cncs and Clickmentioning

confidence: 99%

Regular Linking of Cellulose Nanocrystals via Click Chemistry: Synthesis and Formation of Cellulose Nanoplatelet Gels

2010

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“…Commonly used source for CNCs include P. oceanica leaves (POL) and balls [43], Posidonia oceanic [44], curauá [3], kenaf bast [45], capim dourado [46], MCC [47]. In rare case, spherical CNCs were obtained via hydrolysis of a combination of sulfuric and hydrochloric acids under ultrasonication [48,49]. These CNCs with unusual morphology present an excellent thermal stability due to the smaller amount of sulfate groups.…”

Section: Cncmentioning

confidence: 99%

Applications of cellulose nanomaterials in pharmaceutical science and pharmacology

Cao¹

2018

Express Polym. Lett.

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Abstract. Cellulose nanomaterials (CNs) have been successfully applied to a variety of scientific areas in recent years with remarkable engineering utilities. As sustainable materials of huge abundance, CNs show significant potentials in fine-tune the microstructures and kinetics from the nano-level. This paper reviews recent key advancements of the use of CNs in the fields of pharmaceutical science and pharmacology. A broad overview of the development of CNs is provided, and the current methods to obtain the materials are discussed. The different types of processing techniques are reviewed, that are critical to the applications in pharmaceutical science and pharmacology. The key breakthroughs of applications in major fields are discussed, including oral administration, topical administration, tissue scaffolds, and antibacterial applications.

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“…Nanocellulose and its composites are promising raw materials for a future of new nanomaterials breakthroughs solely because of their functional properties and shear abundance in nature [21,[269][270][271][272][273][274][275]. Cellulose is the main reinforcing constituent in plant cell walls.…”

Section: Cellulose Nanocrystals (Cncs)mentioning

confidence: 99%

“…Their degradation products are fully nontoxic substances or the starting monomers that satisfy the environmental requirements. A few monomers such as 1,3-propanediol, 1,4-butane diol, γ -butyrolactone, adipic acid, n-methylpyrrolidone, succinic acid and lactic acid produced by fermentation from renewable resources are potential candidates for production of biodegradable polyesters [266][267][268][269][270][271][272][273][274][275][276][277][278].…”

Section: Genetically-engineered Polyestersmentioning

confidence: 99%

Challenges for Natural Monomers and Polymers: Novel Design Strategies and Engineering to Develop Advanced Polymers

Pillai

2010

Designed Monomers and Polymers

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The last century witnessed the emergence of polymer science and technology that enabled the generation of knowledge and techniques to control the size, shape, structure, properties and functions of polymers to generate polymers with unprecedented properties and functions. There have been many attempts to apply this information to natural monomers and polymers to achieve the desired property profiles with varying degrees of success which have given/are giving it a new outlook as a possible alternative source for the production of polymers. Novel concepts and techniques such as 'bio-inspired' polymer design, 'synthetically-inspired' material development, etc., are contributing to the development of natural monomers and polymers as a sustainable resource to generate a knowledge-based design methodology to meet the vastly developing requirements of modern materials. This paper reviews these emerging concepts and techniques that integrate materials synthesis, process and manufacturing options with eco efficiency.

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Preparation and Liquid Crystalline Properties of Spherical Cellulose Nanocrystals

Cited by 152 publications

References 29 publications

Regular Linking of Cellulose Nanocrystals via Click Chemistry: Synthesis and Formation of Cellulose Nanoplatelet Gels

Regular Linking of Cellulose Nanocrystals via Click Chemistry: Synthesis and Formation of Cellulose Nanoplatelet Gels

Applications of cellulose nanomaterials in pharmaceutical science and pharmacology

Challenges for Natural Monomers and Polymers: Novel Design Strategies and Engineering to Develop Advanced Polymers

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