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Kaur J, Gulati M, Zacconi F, Dureja H, Loebenberg R, Ansari MS, AlOmeir O, Alam A, Chellappan DK, Gupta G, Jha NK, Pinto TDJA, Morris A, Choonara YE, Adams J, Dua K, Singh SK. Biomedical Applications of polymeric micelles in the treatment of diabetes mellitus: Current success and future approaches. Expert Opin Drug Deliv 2022; 19:771-793. [PMID: 35695697 DOI: 10.1080/17425247.2022.2087629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Diabetes mellitus (DM) is the most common metabolic disease and multifactorial, harming patients worldwide. Extensive research has been carried out in the search for novel drug delivery systems offering reliable control of glucose levels for diabetics, aiming at efficient management of DM. AREAS COVERED Polymeric micelles (PMs) as smart drug delivery nanocarriers are discussed, focusing on oral drug delivery applications for the management of hyperglycemia. The most recent approaches used for the preparation of smart PMs employ molecular features of amphiphilic block copolymers (ABCs), such as stimulus sensitivity, ligand conjugation, and as a more specific example the ability to inhibit islet amyloidosis. EXPERT OPINION PMs provide a unique platform for self-regulated or spatiotemporal drug delivery, mimicking the working mode of pancreatic islets to maintain glucose homeostasis for prolonged periods. This unique characteristic is achieved by tailoring the functional chemistry of ABCs considering the physicochemical traits of PMs, including sensing capabilities, hydrophobicity, etc. In addition, the application of ABCs for the inhibition of conformational changes in islet amyloid polypeptide garnered attention as one of the root causes of DM. However, research in this field is limited and further studies at the clinical level are required.
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Affiliation(s)
- Jaskiran Kaur
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
| | - Monica Gulati
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India.,Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, Australia
| | - Flavia Zacconi
- de Farmacia, Pontificia Universidad Cat´olica de ChileDepartamento de Química Org´anica, Facultad de Química y , Santiago, Chile.,Institute for Biological and Medical Engineering, Schools of Engineering, Medicine and Biological Sciences, Pontificia Universidad Cat´olica de Chile, Macul, Chile
| | - Harish Dureja
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, India
| | - Raimar Loebenberg
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta AB, Canada
| | - Md Salahuddin Ansari
- Department of Pharmacy Practice, College of Pharmacy Aldawadmi, Shaqra University Shaqra, Saudi Arabia
| | - Othman AlOmeir
- Department of Pharmacy Practice, College of Pharmacy Aldawadmi, Shaqra University Shaqra, Saudi Arabia
| | - Aftab Alam
- Department of Pharmacognosy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Kharj, KSA
| | - Dinesh Kumar Chellappan
- Department of Life Sciences, School of Pharmacy, International Medical University, Bukit Jalil, Malaysia
| | - Gaurav Gupta
- Department of pharmacology, School of Pharmacy, Suresh Gyan Vihar University, Jagatpura, India.,Department of Pharmacology, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India.,Uttaranchal Institute of Pharmaceutical Sciences, Uttaranchal University, Dehradun, India
| | - Niraj Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (SET), Sharda University, Greater Noida, India
| | | | - Andrew Morris
- Swansea University Medical School, Swansea University, Singleton Park, Swansea
| | - Yahya E Choonara
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, University of Witwatersrand, Johannesburg, South Africa
| | - Jon Adams
- Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, Australia
| | - Kamal Dua
- Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, Australia.,Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Ultimo, Australia
| | - Sachin Kumar Singh
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India.,Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, Australia
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2
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Lu Q, Wu J, Wang H, Huang B. One-Pot Green Preparation of Fluorescent Cellulose Nanofibers. Polymers (Basel) 2022; 14:polym14071313. [PMID: 35406185 PMCID: PMC9003441 DOI: 10.3390/polym14071313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 03/19/2022] [Accepted: 03/20/2022] [Indexed: 02/04/2023] Open
Abstract
Fluorescent cellulose nanofibers (FCNFs), with a high yield, were prepared via one-pot hydrolysis and the grafting reaction of cellulose with thiazolipyridine carboxylic acid (TPCA). The hydrolysis and Fischer esterification of cellulose were conducted under microwave-hydrothermal conditions; meanwhile, TPCA formation was induced by the dehydration reaction between L-cysteine and citric acid. The effects of the reaction temperature and reaction time on the yield and performance of FCNF were investigated. The morphology and size, surface chemical property, crystal structure, thermostability, and fluorescent performance of FCNF were characterized. The results revealed that the yield of FCNF reached 73.2% under a microwave power of 500 W, reaction temperature of 110 °C, and reaction time of 5 h. The FCNF obtained presents a short rod-like morphology. The crystallinity of the FCNFs is 80%, and their thermal stability did not decline significantly. Additionally, the fluorescent performance of the FCNFs is excellent, which results in them having good sensitivity to chloride ions. The good fluorescent performance and significant responsiveness to chloride ions of FCNFs lead to them having broad prospects in bio-labeling, biosensing, information storage, chloride ion detection, among others.
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Affiliation(s)
- Qilin Lu
- Fujian Key Laboratory of Novel Functional Textile Fibers and Materials, Minjiang University, Fuzhou 350108, China; (J.W.); (H.W.)
- Correspondence:
| | - Jiayin Wu
- Fujian Key Laboratory of Novel Functional Textile Fibers and Materials, Minjiang University, Fuzhou 350108, China; (J.W.); (H.W.)
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
| | - Hanchen Wang
- Fujian Key Laboratory of Novel Functional Textile Fibers and Materials, Minjiang University, Fuzhou 350108, China; (J.W.); (H.W.)
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
| | - Biao Huang
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
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Zheng S, Jiang L, Zhang C, Ma N, Liu X. Facile and environment-friendly preparation of high-performance polyimide aerogels using water as the only solvent. Polym Chem 2022. [DOI: 10.1039/d1py01573g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study described a facile and environmentally friendly method for preparing polyimide (PI) aerogels via sol-gel process and freeze-drying without the use of organic solvents. The prepared PI aerogels showed...
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Cheng Y, Mondal AK, Wu S, Xu D, Ning D, Ni Y, Huang F. Study on the Anti-Biodegradation Property of Tunicate Cellulose. Polymers (Basel) 2020; 12:E3071. [PMID: 33371516 PMCID: PMC7767540 DOI: 10.3390/polym12123071] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 12/08/2020] [Accepted: 12/15/2020] [Indexed: 11/30/2022] Open
Abstract
Tunicate is a kind of marine animal, and its outer sheath consists of almost pure Iβ crystalline cellulose. Due to its high aspect ratio, tunicate cellulose has excellent physical properties. It draws extensive attention in the construction of robust functional materials. However, there is little research on its biological activity. In this study, cellulose enzymatic hydrolysis was conducted on tunicate cellulose. During the hydrolysis, the crystalline behaviors, i.e., crystallinity index (CrI), crystalline size and degree of polymerization (DP), were analyzed on the tunicate cellulose. As comparisons, similar hydrolyses were performed on cellulose samples with relatively low CrI, namely α-cellulose and amorphous cellulose. The results showed that the CrI of tunicate cellulose and α-cellulose was 93.9% and 70.9%, respectively; and after 96 h of hydrolysis, the crystallinity, crystalline size and DP remained constant on the tunicate cellulose, and the cellulose conversion rate was below 7.8%. While the crystalline structure of α-cellulose was significantly damaged and the cellulose conversion rate exceeded 83.8% at the end of 72 h hydrolysis, the amorphous cellulose was completely converted to glucose after 7 h hydrolysis, and the DP decreased about 27.9%. In addition, tunicate cellulose has high anti-mold abilities, owing to its highly crystalized Iβ lattice. It can be concluded that tunicate cellulose has significant resistance to enzymatic hydrolysis and could be potentially applied as anti-biodegradation materials.
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Affiliation(s)
- Yanan Cheng
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
| | - Ajoy Kanti Mondal
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
- Institute of Fuel Research and Development, Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
| | - Shuai Wu
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
| | - Dezhong Xu
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
| | - Dengwen Ning
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
| | - Yonghao Ni
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
- Department of Chemical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
| | - Fang Huang
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China; (Y.C.); (A.K.M.); (S.W.); (D.X.); (D.N.)
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Extraction of Cellulose Nano-Whiskers Using Ionic Liquid-Assisted Ultra-Sonication: Optimization and Mathematical Modelling Using Box–Behnken Design. Symmetry (Basel) 2019. [DOI: 10.3390/sym11091148] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study focuses on the extraction of cellulose nano-whiskers (CNWs) from the leaves of Adansonia kilima (AK), usually known as African baobab, using a combination of a microwave-assisted alkali (KOH) pre-treatment with subsequent bleaching process prior to ultra-sonication. Ultra-sonication was carried out using the ionic liquid (IL) 1-butyl-3-methylimidazolium hydrogen sulfate (Bmim-HSO4). Process parameters for ultra-sonication were optimized using a two-level factorial Box–Behnken design (BBD). Process variables such as ultra-sonication power (x1), hydrolysing time (x2) and temperature (x3) were varied. Responses selected were percentage crystallinity index, CrI% (y1) and yield% (y1) for the finally procured CNWs sample. Regression analysis was carried out to develop quadratic model to analyze the effect of process variables on IL-assisted ultra-sonication process. Analysis of variance (ANOVA) showed that ultra-sonication power was the most influential aspect for hydrolyzing the amorphous segments of crude cellulose extracted from baobab leaves. A relative study of the physio-chemical properties of the starting lignocellulosic substrate (AK), KOH pre-treated, bleached and IL-assisted ultra-sonicated CNWs was conducted. The synthesized samples were characterized using Fourier transform infrared spectroscopy, Scanning electron microscopy, atomic force microscopy, high resolution transmission electron microscopy, X-ray diffraction and thermo-gravimetric and zeta potential analysis. Under optimum condition, the extracted CNWs showed an average width of 15–20 nm; with high crystallinity index of 86.46%. This research provides an insight about the delignification of Adansonia kilima (AK) leaves and its effective conversion to CNWs having high crystallinity.
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6
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Hafez I, Yang HS, Tze WTY. Mechanically enhanced electrically conductive films from polymerization of 3,4-ethylenedioxythiophene with wood microfibers. J Appl Polym Sci 2017. [DOI: 10.1002/app.45127] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Islam Hafez
- Department of Bioproducts and Biosystems Engineering; University of Minnesota; 2004 Folwell Ave Saint Paul Minnesota 55108
| | - Han-Seung Yang
- Department of Bioproducts and Biosystems Engineering; University of Minnesota; 2004 Folwell Ave Saint Paul Minnesota 55108
| | - William Tai Yin Tze
- Department of Bioproducts and Biosystems Engineering; University of Minnesota; 2004 Folwell Ave Saint Paul Minnesota 55108
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Hoeng F, Denneulin A, Bras J. Use of nanocellulose in printed electronics: a review. NANOSCALE 2016; 8:13131-54. [PMID: 27346635 DOI: 10.1039/c6nr03054h] [Citation(s) in RCA: 172] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Since the last decade, interest in cellulose nanomaterials known as nanocellulose has been growing. Nanocellulose has various applications ranging from composite reinforcement to rheological modifiers. Recently, nanocellulose has been shown to have great potential in flexible printed electronics applications. The property of nanocellulose to form self-standing thermally stable films has been exploited for producing transparent and smooth substrates for printed electronics. However, other than substrates, the field of printed electronics involves the use of inks, various processing methods and the production of flexible electronic devices. This review aims at providing an overview of the use and potential of nanocellulose throughout the printed electronics field.
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Affiliation(s)
- Fanny Hoeng
- 1Univ. Grenoble Alpes, LGP2, F-38000 Grenoble, France.
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8
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Li T, Pu JH, Ma LF, Bao RY, Qi GQ, Yang W, Xie BH, Yang MB. An extremely uniform dispersion of MWCNTs in olefin block copolymers significantly enhances electrical and mechanical performances. Polym Chem 2015. [DOI: 10.1039/c5py01236h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new guidance for the development of conductive elastomers with improved comprehensive performance by considering chain architecture is provided.
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Affiliation(s)
- Ting Li
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Jun-Hong Pu
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Li-Feng Ma
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Rui-Ying Bao
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Guo-Qiang Qi
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Wei Yang
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Bang-Hu Xie
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Ming-Bo Yang
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
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9
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Charba A, Mumtaz M, Brochon C, Cramail H, Hadziioannou G, Cloutet E. Preparation of water-free PEDOT dispersions in the presence of reactive polyisoprene stabilizers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:12474-12482. [PMID: 25278096 DOI: 10.1021/la502480r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Poly(3,4-ethylenedioxythiophene) nanoparticles with narrow size distribution were prepared in organic dispersant media in the presence of both iron(III) dodecylbenzenesulfonate {Fe(DBS)3}-acting as both an oxidant and a stabilizer-and ω-functionalized polyisoprenes (ω-R-PI) as costabilizers. The effects of the solvent nature and concentration of Fe(DBS)3 on the size and morphology of the PEDOT particles were first studied in the absence of costabilizer. Second, the effects of the molar mass, concentration, and nature of the functional end group of the polyisoprene costabilizer were investigated. PEDOT nano-objects were characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), dynamic light scattering (DLS), and conductivity measurements.
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Affiliation(s)
- Abdulkarim Charba
- Laboratoire de Chimie des Polymères Organiques, UMR 5629, CNRS , 16 avenue Pey Berland, Pessac, Cedex F-33607, France
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10
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Mueller S, Weder C, Foster EJ. Isolation of cellulose nanocrystals from pseudostems of banana plants. RSC Adv 2014. [DOI: 10.1039/c3ra46390g] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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11
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Lu Z, Fan L, Zheng H, Lu Q, Liao Y, Huang B. Preparation, characterization and optimization of nanocellulose whiskers by simultaneously ultrasonic wave and microwave assisted. BIORESOURCE TECHNOLOGY 2013; 146:82-88. [PMID: 23916980 DOI: 10.1016/j.biortech.2013.07.047] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 07/11/2013] [Accepted: 07/13/2013] [Indexed: 06/02/2023]
Abstract
Simultaneously ultrasonic wave and microwave assisted technique (SUMAT), as a method of process intensification, was first applied to the preparation of nanocellulose whiskers (NCWs) from filter paper by sulfuric acid hydrolysis. The effects of temperature, sulfuric acid concentration, and mass of raw material and time on the yield of NCWs were investigated by single-factor experiments, and the preparation conditions were optimized with response surface methodology. The obtained NCWs were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and thermal gravimetry. The results showed NCWs were facilely prepared by using SUMAT. However, some harsh reaction conditions such as high temperature, strong acidity and long time treatment easily induced the reduction of the yield of NCWs. Under the optimal conditions, the yield and the crystallinity of NCWs with the crystal form of cellulose Iα is 85.75% and 80%, respectively.
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Affiliation(s)
- Zexiang Lu
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China.
| | - Liwei Fan
- College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Huaiyu Zheng
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Qilin Lu
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Yiqiang Liao
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Biao Huang
- College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
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12
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Nateghi MR, Dehghan S, Shateri-Khalilabad M. A Facile Route for Fabrication of Conductive Hydrophobic Textile Materials Using N-octyl/N-perfluorohexyl Substituted Polypyrrole. INT J POLYM MATER PO 2013. [DOI: 10.1080/00914037.2013.769167] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Tkalya E, Ghislandi M, Thielemans W, van der Schoot P, de With G, Koning C. Cellulose Nanowhiskers Templating in Conductive Polymer Nanocomposites Reduces Electrical Percolation Threshold 5-Fold. ACS Macro Lett 2013; 2:157-163. [PMID: 35581779 DOI: 10.1021/mz300597j] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The creation of conducting networks within composite materials is very important to reduce the generally expensive conducting polymer content, to create conducting/nonconducting domains, and to adjust conductivity of the final composite. We developed cellulose/poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS)-based polystyrene (PS) composites with an extremely low percolation threshold of the conductive polymer. The percolation threshold of PEDOT:PSS in PEDOT:PSS/PS blends, being 2.2 wt % (2.31 vol%), was lowered to 0.4 wt % (0.42 vol%) by adding 0.8 wt % (0.56 vol%) of cheap, nonconducting cellulose nanowhiskers. Such a low percolation threshold of PEDOT:PSS is attributed to the templating effect of the cellulose nanowhiskers: the conducting PEDOT:PSS is thought to adsorb onto the cellulose surface and by doing that (at least partly) covers the network formed by the percolating, high aspect ratio cellulose whiskers in the PS matrix. UV-vis experiments indeed point to an interaction between PEDOT:PSS and the cellulose whiskers, confirming the templating of PEDOT:PSS onto the nanowhiskers during processing and film formation. This approach can be applied to other conducting composites to reduce the required conducting polymer content and increase the ease of processing as electrical percolation is directly achieved.
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Affiliation(s)
- Evgeniy Tkalya
- Department of Chemical
Engineering and Chemistry, Polymer Chemistry Group, Technische Universiteit Eindhoven, P.O. Box 513, 5600
MB Eindhoven, The Netherlands
| | - Marcos Ghislandi
- Laboratory of Materials
and Interface Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Wim Thielemans
- School of Chemistry, Faculty of Science, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
- Process and Environmental
Research Division, Faculty of Engineering, The University of Nottingham, University Park, Nottingham,
NG7 2RD, United Kingdom
| | - Paul van der Schoot
- Department of Applied
Physics, Group Theory of Polymers and Soft Matter, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Institute for Theoretical
Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands
| | - Gijsbertus de With
- Laboratory of Materials
and Interface Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Cor Koning
- Department of Chemical
Engineering and Chemistry, Polymer Chemistry Group, Technische Universiteit Eindhoven, P.O. Box 513, 5600
MB Eindhoven, The Netherlands
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Tang L, Huang B, Lu Q, Wang S, Ou W, Lin W, Chen X. Ultrasonication-assisted manufacture of cellulose nanocrystals esterified with acetic acid. BIORESOURCE TECHNOLOGY 2013; 127:100-105. [PMID: 23131628 DOI: 10.1016/j.biortech.2012.09.133] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Revised: 08/26/2012] [Accepted: 09/28/2012] [Indexed: 06/01/2023]
Abstract
Esterified cellulose nanocrystals (E-CNCs) are cellulose derivatives that could be applied in biomedical and chemical industries. E-CNCs were prepared with cellulose pulp using a mixture of 17.5M acetic and 18.4M sulfuric acid with the aid of ultrasonication. The effects of esterification time (3-7h), ultrasonication time (with a frequency of 40 kHz, 0 to 6h) and temperature (68-75 °C) on the yield and degree of substitution (DS) of E-CNCs were evaluated. The sample obtained without ultrasonication had the lowest yield and DS value of 48.16% and 0.22, respectively, whereas ultrasonication for 5h at 70 °C resulted in a yield of 85.38% and a DS value of 0.46. Characterization indicated the successful esterification of hydroxyl groups of cellulose, and the width of rod-shaped E-CNCs was from 10 to 100 nm. The study provides a simple and convenient method to manufacture E-CNCs.
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Affiliation(s)
- Lirong Tang
- Fujian Agriculture and Forestry University, Fuzhou 350002, China
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15
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Liew SY, Walsh DA, Thielemans W. High total-electrode and mass-specific capacitance cellulose nanocrystal-polypyrrole nanocomposites for supercapacitors. RSC Adv 2013. [DOI: 10.1039/c3ra41168k] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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16
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Dong RX, Liu CT, Huang KC, Chiu WY, Ho KC, Lin JJ. Controlling formation of silver/carbon nanotube networks for highly conductive film surface. ACS APPLIED MATERIALS & INTERFACES 2012; 4:1449-1455. [PMID: 22301712 DOI: 10.1021/am2016969] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Flexible polymer films with high electrical conductivity were prepared through a simple coating of well-dispersed silver nanoparticle (AgNP) and multiwalled carbon nanotube (CNT) solution. The hybrid film with surface resistance as low as 1 × 10(-2) Ω/sq was prepared by controlling the annealing temperature in air and by using a suitable composition of silver nitrate/CNT/poly(oxyethylene)-oligo(imide) (POE-imide) in the ratio 20:1:20 by weight. During the heating, color of the film surface changed from black to golden to milky white, indicating the accumulation of AgNPs through surface migration and melting into CNT-connected networks. Thermogravimetric measurements showed that the transition temperature of 170 °C was responsible for the POE-imide degeneration and the subsequent Ag melting with a decrease in the surface resistance from 2.1 × 10(5) to 2.0 × 10(-1) Ω/sq, which was able to illuminate light-emitting diode lamps because of the formation of a continuous Ag network.
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Affiliation(s)
- Rui-Xuan Dong
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
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Tang LR, Huang B, Ou W, Chen XR, Chen YD. Manufacture of cellulose nanocrystals by cation exchange resin-catalyzed hydrolysis of cellulose. BIORESOURCE TECHNOLOGY 2011; 102:10973-10977. [PMID: 21993330 DOI: 10.1016/j.biortech.2011.09.070] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 09/02/2011] [Accepted: 09/16/2011] [Indexed: 05/31/2023]
Abstract
Cellulose nanocrystals (CNC) were prepared from microcrystalline cellulose (MCC) by hydrolysis with cation exchange resin (NKC-9) or 64% sulfuric acid. The cation exchange resin hydrolysis parameters were optimized by using the Box-Behnken design and response surface methodology. An optimum yield (50.04%) was achieved at a ratio of resin to MCC (w/w) of 10, a temperature of 48 °C and a reaction time of 189 min. Electron microscopy (EM) showed that the diameter of CNCs was about 10-40 nm, and the length was 100-400 nm. Regular short rod-like CNCs were obtained by sulfuric acid hydrolysis, while long and thin crystals of cellulose were obtained with the cation exchange resin. X-ray diffraction (XRD) showed that, compared with MCC, the crystallinity of H2SO4-CNC and resin-CNC increased from 72.25% to 77.29% and 84.26%, respectively. The research shows that cation exchange resin-catalyzed hydrolysis of cellulose could be an excellent method for manufacturing of CNC in an environmental-friendly way.
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Affiliation(s)
- Li-rong Tang
- Jinshan College, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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Deepa M, Kharkwal A, Joshi AG, Srivastava AK. Charge Transport and Electrochemical Response of Poly(3,4-ethylenedioxypyrrole) Films Improved by Noble-Metal Nanoparticles. J Phys Chem B 2011; 115:7321-31. [DOI: 10.1021/jp201055y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Melepurath Deepa
- Department of Chemistry, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram-502205, Andhra Pradesh, India
| | - Aneeta Kharkwal
- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India
| | - Amish G. Joshi
- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India
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