PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION
Cotton linter pulp was oxidized in the TEMPO-NaBr-NaClO system with ultrasonic treatment, and cellulose nanocrystals having high carboxylate content were produced directly. Results showed that the C6 primary hydroxyl group of cellulose fiber was converted to the carboxylate group, whose amount could...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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North Carolina State University
2011-04-01
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| Series: | BioResources |
| Subjects: | |
| Online Access: | http://www.ncsu.edu/bioresources/BioRes_06/BioRes_06_2_1136_Qin_TC_Prep_Hi_COOH_Cell_Nanocryst_TEMPO_Ultrason_Linter_1430.pdf |
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| author | Zhong-Yan Qin Guolin Tong Y. C. Frank Chin Jian-Cheng Zhou |
| author_facet | Zhong-Yan Qin Guolin Tong Y. C. Frank Chin Jian-Cheng Zhou |
| author_sort | Zhong-Yan Qin |
| collection | DOAJ |
| description | Cotton linter pulp was oxidized in the TEMPO-NaBr-NaClO system with ultrasonic treatment, and cellulose nanocrystals having high carboxylate content were produced directly. Results showed that the C6 primary hydroxyl group of cellulose fiber was converted to the carboxylate group, whose amount could be up to 1.66 mmol/g. During the oxidizing reaction, some of the amorphous region in the cellulose fiber was modified and gradually hydrolyzed, but the crystalline region still remained. It was also shown by TEM (Transmission electron microscopy) that the widths of cellulose nanocrystals were approximately 5-10 nm, and the lengths were approximately 100-400 nm. The high carboxylate content cellulose nanocrystals could be produced in one step by this method, yielding a stable and well dispersed aqueous suspension. |
| first_indexed | 2024-12-14T11:19:39Z |
| format | Article |
| id | doaj.art-a05cbaa274f14ebc95f60da862406df1 |
| institution | Directory Open Access Journal |
| issn | 1930-2126 |
| language | English |
| last_indexed | 2024-12-14T11:19:39Z |
| publishDate | 2011-04-01 |
| publisher | North Carolina State University |
| record_format | Article |
| series | BioResources |
| spelling | doaj.art-a05cbaa274f14ebc95f60da862406df12022-12-21T23:03:50ZengNorth Carolina State UniversityBioResources1930-21262011-04-016211361146PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATIONZhong-Yan QinGuolin TongY. C. Frank ChinJian-Cheng ZhouCotton linter pulp was oxidized in the TEMPO-NaBr-NaClO system with ultrasonic treatment, and cellulose nanocrystals having high carboxylate content were produced directly. Results showed that the C6 primary hydroxyl group of cellulose fiber was converted to the carboxylate group, whose amount could be up to 1.66 mmol/g. During the oxidizing reaction, some of the amorphous region in the cellulose fiber was modified and gradually hydrolyzed, but the crystalline region still remained. It was also shown by TEM (Transmission electron microscopy) that the widths of cellulose nanocrystals were approximately 5-10 nm, and the lengths were approximately 100-400 nm. The high carboxylate content cellulose nanocrystals could be produced in one step by this method, yielding a stable and well dispersed aqueous suspension.www.ncsu.edu/bioresources/BioRes_06/BioRes_06_2_1136_Qin_TC_Prep_Hi_COOH_Cell_Nanocryst_TEMPO_Ultrason_Linter_1430.pdfCotton linterHigh carboxylate contentNanocrystalsTEMPO oxidationUltrasonic treatment |
| spellingShingle | Zhong-Yan Qin Guolin Tong Y. C. Frank Chin Jian-Cheng Zhou PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION BioResources Cotton linter High carboxylate content Nanocrystals TEMPO oxidation Ultrasonic treatment |
| title | PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION |
| title_full | PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION |
| title_fullStr | PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION |
| title_full_unstemmed | PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION |
| title_short | PREPARATION OF ULTRASONIC-ASSISTED HIGH CARBOXYLATE CONTENT CELLULOSE NANOCRYSTALS BY TEMPO OXIDATION |
| title_sort | preparation of ultrasonic assisted high carboxylate content cellulose nanocrystals by tempo oxidation |
| topic | Cotton linter High carboxylate content Nanocrystals TEMPO oxidation Ultrasonic treatment |
| url | http://www.ncsu.edu/bioresources/BioRes_06/BioRes_06_2_1136_Qin_TC_Prep_Hi_COOH_Cell_Nanocryst_TEMPO_Ultrason_Linter_1430.pdf |
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