国产日产欧美精品-亚洲国产综合久久精品-色综合色国产热无码一-亚洲欧美日本国产,免费观看一区二区三区_在线观看片A免费不卡观看_亚洲а∨天堂久久精品_99久无码中文字幕一本久道

產品展廳收藏該商鋪

您好 登錄 注冊

當前位置:
美國布魯克海文儀器公司>技術文章>測量應用案例-122-Omni

技術文章

測量應用案例-122-Omni

閱讀:255          發(fā)布時間:2018-4-4

文獻名: Using a fully recyclable dicarboxylic acid for producing dispersible and thermally stable cellulose nanomaterials from different cellulosic sources

 作者 Chao Jia123, Liheng Chen43, Ziqiang Shao1, Umesh P. Agarwal3, Liangbing Hu2, J. Y. Zhu3

1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, China

2.Department of Materials Science and Engineering, University of Maryland College Park, College Park, USA

3.Forest Products Laboratory, USDA Forest Service, Madison, USA

4.Key Laboratory of Biomaterials of Guangdong Higher Education Institutes, Department of Biomedical EngineeringJinan University, Guangzhou, China

 

摘要:We fabricated cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) from different cellulose materials (bleached eucalyptus pulp (BEP), spruce dissolving pulp (SDP) and cotton based qualitative filter paper (QFP) using concentrated oxalic acid hydrolysis and subsequent mechanical fibrillation (for CNFs). The process was green as acid can be easily recovered, and the prepared cellulose nanomaterials were carboxylated and thermally stable. In detail, the CNC yield from the different materials was similar. After hydrolysis, the DP of the cellulose materials decreased substantially, whereas the mechanical fibrillation of the cellulosic solid residues (CSRs) did not dramatically reduce the DP of cellulose. CNCs with different aspect ratios were produced from different starting materials by oxalic acid hydrolysis. The CNCs and CNFs obtained from BEP and QFP possessed more uniform dimensions than those from SDP. On the other hand, CNFs derived from SDP presented the best suspension stability. FTIR analyses verified esterification of cellulose by oxalic acid hydrolysis. The results from both XRD and Raman spectroscopy indicated that whereas XRD crystallinity of CNCs from BEP and QFP did not change significantly, there was some change in Raman crystallinity of these samples. Raman spectra of SDP CNCs indicated that the acid hydrolysis preferably removed cellulose I portion of the samples and therefore the CNCs became cellulose II enriched. TGA revealed that the CNCs obtained from QFP exhibited higher thermal stability compared to those from BEP and SDP, and all the CNCs possessed better thermal stability than that of CNCs from sulfuric acid hydrolysis. The excellent properties of prepared cellulose nanomaterials will be conducive to their application in different fields.

收藏該商鋪

登錄 后再收藏

提示

您的留言已提交成功!我們將在第一時間回復您~

對比框

產品對比 產品對比 聯(lián)系電話 二維碼 意見反饋 在線交流

掃一掃訪問手機商鋪
010-62081908
在線留言
莱阳市| 澄城县| 堆龙德庆县| 德江县| 天长市| 当阳市| 武宁县| 滨州市| 视频| 镇巴县| 大冶市| 洪泽县| 安岳县| 同江市| 潜山县| 正宁县| 长阳| 澄城县| 太仓市| 建昌县| 栾城县| 鄂尔多斯市| 新沂市| 清水河县| 桐庐县| 安新县| 井冈山市| 双江| 贺兰县| 乐清市| 积石山| 乐清市| 贵德县| 托克托县| 乌鲁木齐市| 南郑县| 南靖县| 乐陵市| 伊春市| 桃园市| 诸暨市|