Cellulose Nanocrystals
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2021 ◽  
Author(s):  
Yaqi Wang ◽  
Hang Chen ◽  
Li Cui ◽  
Chao Tu ◽  
Chao Yan

Abstract Alginate fibers have great potential in many applications, such as medical dressings, surgical sutures, and masks, etc. owing to their good biocompatibility and other properties. However, for alginate fibers prepared by wet spinning, the fibers have disadvantages such as low strength, poor toughness, and brittleness. Herein, a simple, scalable, and cost-effective blending spinning strategy was developed to produce the alginate composite fibers with excellent mechanical properties. Cellulose nanocrystals (CNCs) were incorporated directly in the wet spinning solution to improve its strength, wherein the CNCs were prepared from waste cotton fabrics. Polyethylene glycol (PEG) molecular chain was grafted onto the CNC surface to be used as a plasticizer while increasing the dispersibility of CNCs in alginate matrix. It was worth noting that modification of alginate fibers with PEG grafted cellulose nanocrystals (CNC-g-PEG) enhanced the tensile strength and elongation at break, simultaneously. In addition, the CNC-g-PEG modified alginate fibers exhibited improved salt tolerance and reduced water absorbency. This work may make high-value utilization of waste cotton fabrics, and pave the way for the development of high-performance, green alginate fibers.


2021 ◽  
Vol 5 (1) ◽  
pp. 1-8
Author(s):  
Rumesh Samarawickrama ◽  
U.G.S. Wijayapala ◽  
N.D. Wanasekara ◽  
C.A.N. Fernando

Natural dyes can make less environmental problems associated with manufactured colouring agents and textile dyeing. But, the natural dyes fixing process was used chemicals called mordant. The most of times mordants were used metallic salts and metal salts mordants were not environmentally friendly. Therefore, remove the disadvantage associated with natural colorants and the use of nanoparticles. In this research, cotton fabric was treated with the nanoparticle of cellulose nanocrystals (CNCs) as mordant. The cellulose nanocrystals extraction process was done by using Whatman filter paper. The cellulose nanocrystals obtained will be further analyzed and characterized by using selected tools such as Particle size analysis and Fourier-transform infrared (FTIR) spectroscopy. The cotton fabrics mordanting processes were done by two types of pre-mordanting and post-mordanting methods. The three natural ingredients of Mangifera indica (Mango) leaves, Tectona grandis (Teak) leaves and Lannea coromandelica (Indian ash tree) leaves were used to extract the natural dyes using with aqueous extraction method. The extracts from dyeing processes were carried out after and before mordanting processes. The dyed sample from colour fastness to light, washing, and crocking were assessed according to standard methods. The cellulose nanocrystals gave very good colour fastness to light, wash, and rubbing when dyed with all three dye extractions. In the present study, innovative mordant of cellulose nanocrystals and natural dyeing with three natural dye extractions have been shown to give good dyeing results with cotton fabric.


2021 ◽  
Author(s):  
Priscila Siqueira ◽  
Ana de Lima ◽  
Felipe Medeiros ◽  
Augusta Isaac ◽  
Katia Novack ◽  
...  

Abstract The hydrogels are advanced materials used in biomedical applications during wound healing, controlled drug release and to prepare scaffolds. In this work are prepared hydrogels of alginate/chitosan (Alg/Ch) semi-interpenetrating polymer networks (semi-IPN’s) and nanocelluloses. The hydrogels after preparation by freeze drying are namely simply as gels. The cellulose nanocrystals (CNC’s) are obtained from acid hydrolysis of bleached Eucalyptus pulps and oxidized cellulose nanocrystals (CNCT’s) prepared by (2,2,6,6-tetramethylpiperidin-1-yl)oxyl radical catalyzed reaction as known as TEMPO reaction. The cellulose nanofibers (NFC’s) are obtained from mechanical shearing of cellulose pulps and oxidized NFC’s by TEMPO-mediated reaction (NFCT’s). The nanocellulose suspension and gels are characterized by FTIR at ATR mode, TGA, XRD, TEM, SEM, X-ray computed microtomography (micro-CT) and DMTA. The addition of CNC’s, NFC’s, CNCT’s or NFCT’s in the microstructure of gels increases their dimensional stabilities. The best results are obtained when CNCT’s and NFCT’s are added. The mechanical properties and dimensional stability of Alg/Ch semi-IPN’s increase after controlled thermal post-treatment. The heating during thermal post-treatment boosts the physicochemical interactions in the microstructures of semi-IPN’s. The biological assays show biocompatibility of fibroblast cells on the substrates, and differentiation and proliferation up seven days. The optimized mechanical properties, dimensional stability and biocompatibility of the gels studied in this work are important parameters for potential biomedical applications of these biomaterials.


2021 ◽  
pp. 51785
Author(s):  
Zehra Türkoğlu ◽  
Hatice Hande Mert ◽  
Emine Hilal Mert ◽  
Hale Ocak ◽  
Mehmet Selçuk Mert

Small ◽  
2021 ◽  
pp. 2103936
Author(s):  
Guomin Zhao ◽  
Yanping Huang ◽  
Changtong Mei ◽  
Shengcheng Zhai ◽  
Yan Xuan ◽  
...  

Desalination ◽  
2022 ◽  
Vol 521 ◽  
pp. 115385
Author(s):  
Liuqing Yang ◽  
Xudong Liu ◽  
Ximeng Zhang ◽  
Tiantian Chen ◽  
Zhibin Ye ◽  
...  

2021 ◽  
Vol 173 ◽  
pp. 114148
Author(s):  
Jungang Jiang ◽  
Yeling Zhu ◽  
Shiva Zargar ◽  
Jie Wu ◽  
Hale Oguzlu ◽  
...  

Author(s):  
Katherine R. Jinkins ◽  
Jingyu Wang ◽  
Jonathan H. Dwyer ◽  
Xudong Wang ◽  
Michael S. Arnold

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