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Nanocellulose-based Sustainable Barrier and Antimicrobial Coatings
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Nanocellulose-based Sustainable Barrier and Antimicrobial Coatings. |
| 개인저자 | Tyagi, Preeti. |
| 단체저자명 | North Carolina State University. |
| 발행사항 | [S.l.]: North Carolina State University., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 186 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-05B. Dissertation Abstract International |
| ISBN | 9781392477021 |
| 학위논문주기 | Thesis (Ph.D.)--North Carolina State University, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Advisor: Lucia, Lucian |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | The use of biomaterials, especially nanocellulose, has been limited due to their constraints for water barrier properties. The other main constraint with biomaterials used for large scale application is the cost of raw materials and limited supply. The aim of this study is to explore sustainable ways to modify nanocellulose materials including cellulose nanofibers (CNF) and cellulose nano crystals (CNC) for obtaining less hydrophilic nanocellulose-based coatings. Along with obtaining gas, oil and water barrier properties from CNF and CNC, the antimicrobial aspect was also integrated into nanocellulose coatings to improve the scope of application. The first part of the research was focused on obtaining a less hydrophilic and oleophobic sustainable modified CNC coating using a composite forming approach. For this task, CNC were preferred over CNF because the crystalline structure of CNC don't allow penetration any liquid through their crystalline packed structure. To prepare functionalized CNC-composite, additives such as high aspect ratio montmorillonite (MMT) clay, soy protein and alkyne-ketene-dimer (AKD) were employed to improve the packing density of the films. The Fourier-Transform Infrared Spectroscopy (FTIR) confirmed that fewer hydroxyl groups, which are the principal means of hydrophilicity of CNC, were exposed on the surface in CNC-composite coated paper compared to CNC. The CNC-composite coatings were confirmed to have improved water barrier properties and superior oil resistance. The second part of the research includes studying the potential of CNC-composites and CNF in a multilayer coating system. Employing CNF as bottom layer and CNC-composite as top layer was hypothesized to be the best way to minimize the surface energy of coatings along with obtaining highest oxygen and gas barrier properties. The results were validated by measuring surface energy and water contact angle hysteresis. The more hydrophobic protein moieties were confirmed over the top surface of multilayer coated paper surface using Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). A substantial increment in gas and oil barrier properties compared to commercial plastic materials and a significant improvement in water barrier properties were observed. In the third part of the research, potential of CNC along with chitosan was explored for their antimicrobial properties. There were two motives of using CNC in chitosan matrix: one, it would help in overcoming the water absorption and softness issues arising with chitosan. The second hypothesis was based upon the rod-like, rigid, stiff and narrow morphology of CNC particles |
| 일반주제명 | Nanotechnology. Wood sciences. Environmental engineering. |
| 언어 | 영어 |
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