請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71899
完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 柯淳涵 | |
dc.contributor.author | Che-Ning Yang | en |
dc.contributor.author | 楊哲寧 | zh_TW |
dc.date.accessioned | 2021-06-17T06:14:06Z | - |
dc.date.available | 2018-09-25 | |
dc.date.copyright | 2018-09-25 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2018-09-21 | |
dc.identifier.citation | Bondeson D, Mathew A, Oksman K (2006) Optimization of the isolation of nanocrystals from microcrystalline cellulose by acid hydrolysis. Cellulose 13:171.
Beck Candanedo S, Roman M, Gray DG (2005) Effect of reaction conditions on the properties and behavior of wood cellulose nanocrystal suspensions. Biomacromolecules 6:1048-1054. Bhattacharya M (2016) Polymer nanocomposites—a comparison between carbon nanotubes, graphene, and clay as nanofillers. Materials 9:262. Berne BJ, Pecora R (1976) Dynamic Light Scattering with applications to biology, chemistry and Physics. New York Wiley 1:1. Chang CP, Wang IC, Hung KJ, Perng, YS (2010) Preparation and characterization of nanocrystalline cellulose by acid hydrolysis of cotton linter. Taiwan Journal for Forest Science 25:251-64. Camarero Espinosa S, Kuhnt T, Foster EJ, Weder C (2013) Isolation of thermally stable cellulose nanocrystals by phosphoric acid hydrolysis. Biomacromolecules 14:1223-1230. Citeau L, Lamy I, Van F, Elsass F (2003) Colloidal facilitated transfer of metals in soils under different land use. Colloid Surface A 217:11-19. Gu Y, Huang J (2009) Fabrication of natural cellulose substance derived hierarchical polymeric materials. J Mater Chem 19:3764-3770. Habibi Y, Lucia LA, Rojas OJ (2010) Cellulose nanocrystals: chemistry, self assembly, and applications. Chem Rev 110:3479-3500. Johar N, Ahmad I, Dufresne A (2012) Extraction, preparation and characterization of cellulose fibres and nanocrystals from rice husk. Ind Crop Prod, 37:93-99. Kuo CH, Lee CK (2009) Enhancement of enzymatic saccharification of cellulose by cellulose dissolution pretreatments. Carbohyd Polym 77:41-46. Kargarzadeh H, Ahmad I, Abdullah I , Dufresne A, Zainudin SY, Sheltami RM (2012) Effects of hydrolysis conditions on the morphology, crystallinity, and thermal stability of cellulose nanocrystals extracted from kenaf bast fibers. Cellulose 19:855-866. Konkena B, Vasudevan S (2012) Understanding aqueous dispersibility of graphene oxide and reduced graphene oxide through pKa measurements. J Phys Chem Lett 3:867-872. Liu X, Gu Y, Huang J (2010) Hierarchical, Titania‐Coated, Carbon Nanofibrous Material Derived from a natural cellulosic substance. Chem-Eur J 16:7730-7740. Lu P, Hsieh YL (2010) Preparation and properties of cellulose nanocrystals: rods, spheres, and network. Carbohyd Polym 82:329-336. Marchessault RH, Sundararajan PR (1983) Cellulose. The Polysaccharides 11-95. Moon RJ, Martini A, Nairn J, Simonsen J, Youngblood J (2011) Cellulose nanomaterials properties and nanocomposites. Chem Soc Rev 40:39413994. Maiti S, Jayaramudu J, Das K, Reddy SM, Sadiku R, Ray SS, Liu D (2013) Preparation and characterization of nano-cellulose with new shape from different precursor. Carbohyd Polym 98:562-567. Pakzad A, Simonsen J, Yassar RS (2012) Gradient of nanomechanical properties in the interphase of cellulose nanocrystal composites. Compos Sci Technol 72:314-319. O'Sullivan AC (1997) Cellulose: the structure slowly unravels. Cellulose 4:173-207. Peng S, Fan X, Liu X, Zhang J (2013) Water-dispersible nanorods with high aspect ratio: microwave synthesis, characterization, formation mechanism and catalytic activity. Asian J Chem 25:2513. Purves CB (1954) Chemical nature of cellulose and its derivatives. Cellulose and Cellulose Derivatives Part 1:29-98. Roman M, Winter WT (2004) Effect of sulfate groups from sulfuric acid hydrolysis on the thermal degradation behavior of bacterial cellulose. Biomacromolecules 5:1671-1677. Syverud K, Stenius P (2009) Strength and barrier properties of MFC films. Cellulose 16:75. Stenstad P, Andresen M, Tanem BS, Stenius P (2008) Chemical surface modifications of microfibrillated cellulose. Cellulose 15:35-45. Shimazaki Y, Miyazaki Y, Takezawa Y, Nogi M, Abe K, Ifuku S, Yano H (2007) Excellent thermal conductivity of transparent cellulose nanofiber/epoxy resin nanocomposites. Biomacromolecules 8:2976-2978. Wei S, Kumar V, Banker GS (1996) Phosphoric acid mediated depolymerization and decrystallization of cellulose: preparation of low crystallinity cellulose—a new pharmaceutical excipient. Int J Pharm 142:175-181. Wang N, Ding E, Cheng R (2007) Thermal degradation behaviors of spherical cellulose nanocrystals with sulfate groups. Polymer 48:3486-3493. Wang Y, Wei X, Li J, Wang J, Wang Q, Chen J, Kong L (2015) Study on nanocellulose by high pressure homogenization in homogeneous isolation. Fiber Polym 16:572-578. Xiang Q, Lee YY, Pettersson PO, Torget RW (2003) Heterogeneous aspects of acid hydrolysis of α-cellulose. In Biotechnology for Fuels and Chemicals pp. 505514. Xu X, Liu F, Jiang L, Zhu JY, Haagenson D, Wiesenborn DP (2013) Cellulose nanocrystals vs. cellulose nanofibrils: a comparative study on their microstructures and effects as polymer reinforcing agents. Acs Appl Mater Inter 5:2999-3009. Zhang J, Zhang J, Lin L, Chen T, Zhang J, Liu S, Ouyang P (2009) Dissolution of microcrystalline cellulose in phosphoric acid—molecular changes and kinetics. Molecules 14:5027-5041. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71899 | - |
dc.description.abstract | 奈米結晶纖維素為一種具有可再生性及生物可降解性的綠色永續材料,其可透過纖維素製備,傳統上經過硫酸水解製備奈米結晶纖維素相當耗時且產率低落,而本研究發現,透過磷酸水解能大幅提升奈米結晶纖維素之水解效率以及產率。本研究使用四種木質纖維素原料,透過磷酸預處理,降低纖維素之結晶區的密度,再以3, 5, 7.5, 10分鐘之硫酸水解,製備奈米結晶纖維素。研究結果顯示,經由磷酸預處理之樣品,可在10分鐘內獲得奈米結晶纖維素,粒徑分佈介於10到100 nm之間,並且擁有較集中的粒徑分佈,而未經磷酸前處理之樣品再經過3小時硫酸水解後,各樣品之平均粒徑仍大於100 nm。藉由添加陰電性電解質,能夠提升纖維素在預處理完後的分散性,降低纖維素自集成的現象發生,其界達電位由原本的-9±-0.8 mv下降至-20.9±-2.1 mv,相較於未添加電解質之BEK樣品,添加1 %陰性電解質之樣品能在更短的時間內達到奈米尺度。而比較磷酸前處理與未經過磷酸前處理之樣品間的差異,可發現經過磷酸前處理之奈米結晶纖維素的水解效率與尺寸均一性皆有上升,顯示磷酸處理有其發展與應用之潛力。 | zh_TW |
dc.description.abstract | Cellulose nanocrystals (CNCs) is a renewable and biodegradable materials, traditional approach for preparing CNCs is through sulfuric acid hydrolysis, but it is time-consuming with low yield. In this study, we aim to produce high quality CNCs in efficient way. We prepare four kinds of cellulose feedstocks, including microcrystalline cellulose, bleached pulp, unbleached pulp and α -cellulose, each material was first decrystallized by phosphoric acid pretreatment, follow by sulfuric acid hydrolyzed to prepare cellulose Nanocrystals. The result shows that with phosphoric acid pretreatment, the nanoscale cellulose can be obtained within 7.5 min, particle size was between 10-100 nm with unimodal distribution, which is much efficient than the control group, and as hydrolysis time rising the smaller particle size can be observed. Adding anionic electrolyte increased dispersibility and reduce self-assembly by reducing zeta potential from -9±-0.8 to -20.9±-2.1 mv, which lead to better hydrolysis efficiency. All cellulose after sulfuric acid hydrolysis got massive weight loss due to degrading, cause by glycosidic bond breaking, two stage hydrolysis microcrystalline cellulose after 7.5 min sulfuric acid hydrolysis, molecular weight drop dramatically from 61.68 to 12.82. These result prove that more homogenous cellulose can be acquired by implementing phosphoric acid pretreatment. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T06:14:06Z (GMT). No. of bitstreams: 1 ntu-107-R05625035-1.pdf: 11614409 bytes, checksum: 1bdae0330ae38a0598dd026fe0162a70 (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 口試委員會審定書 I
摘要 II Abstract II Contents III Figure Index V Table Index VI List of Abbreviations VII Chapter 1 Introduction 1 Chapter 2 Literature Review 4 2.1 Cellulose, cellulose nanocrystals and cellulose nanofibers 4 2.1.1 Structure and properties 4 2.1.2. Degree of crystallinity 7 2.2 Phosphoric acid 10 2.2.1 Properties 10 2.2.2 Phosphoric acid hydrolysis of cellulose 11 2.3 Sulfuric acid 12 2.3.1 Properties 12 2.3.2 Sulfuric acid hydrolysis of cellulose 13 2.4 Polyelectrolytes 15 2.4.1 Properties 15 2.4.2 Poly (diallyldimethylammonium chloride) 16 2.4.3 Polyanetholesulphonic acid sodium salt (pss) 16 2.4.4 Sodium dodecyl sulfate (sds) 17 Chapter 3 Materials and Methods 18 3.1. Framework 18 3.2. Materials 19 3.2.1 Cellulos feedstocks 19 3.2.2 Mineral acids 20 3.2.3 Polyelectrolyte 21 3.3 Acid hydrolysis of cellulose 22 3.3.1 Phosphoric acid hydrolysis 22 3.3.2 Sulfuric acid hydrolysis 23 3.4 Characterization 24 3.4.1 Particle size measurement 24 3.4.2 SEM analysis 25 3.4.3 X-ray diffraction measurement 25 3.4.4 Thermogravimetric analysis 26 3.4.5 Gel permeation chromatography 26 Chapter 4 Results and Discussion 27 4.1 Properties of cellulose feedstocks 27 4.1.1 Chemical composition of cellulose feedstock 27 4.1.2 Crystallinity indexes 27 4.2 Yields of substrates 28 4.3 Particle size 31 4.3.1 Cellulose-S and cellulose-P-S 31 4.3.2 Effect of lignin 37 4.3.3 Effect of electrolyte 40 4.4 Zeta potential and dispersibility 42 4.4.1 Zeta potential and dispersibility 42 4.4.2 Sulfuric acid and phosphoric acid hydrolysis 43 4.4.3 Effect of electrolyte 46 4.4.4 Dispersibility of acid hydrolyzed cellulose 47 4.5 Morphology 53 4.5.1 Cellulose feedstocks 53 4.5.2 Phosphoric acid pretreatment 54 4.5.3 Sulfuric acid hydrolysis 55 4.5.4 Effect of electrolyte 56 4.6 Molecular weight 58 4.6.1 Cellulose-P and cellulose-P-S 58 4.6.2 Cellulose-P-S and control group 60 4.7 Thermal properties 61 4.8 CNCs prepared by different starting materials 63 Chapter 5 Conclusion 65 Chapter 6 References 67 Appendix 1 Particle size distribution 70 Appendix 2 Molecular weight distribution 74 | |
dc.language.iso | en | |
dc.title | 奈米纖維素製備之優化:磷酸前處理 | zh_TW |
dc.title | The optimized approach for preparing cellulose nanocrystal: phosphoric acid pretreatment | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 藍浩繁,吳嘉文,蔡協志 | |
dc.subject.keyword | 木質纖維素,磷酸處理,硫酸水解,奈米結晶纖維素,生物可降解, | zh_TW |
dc.subject.keyword | Lignocellulose,Phosphoric acid pretreatment,Sulfuric acid hydrolysis,Cellulose nanocrystal,Biodegradable, | en |
dc.relation.page | 78 | |
dc.identifier.doi | 10.6342/NTU201804142 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2018-09-21 | |
dc.contributor.author-college | 生物資源暨農學院 | zh_TW |
dc.contributor.author-dept | 森林環境暨資源學研究所 | zh_TW |
顯示於系所單位: | 森林環境暨資源學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-107-1.pdf 目前未授權公開取用 | 11.34 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。