February 2020Pub Date : 2020-03-01DOI: 10.32964//tj19.2.103
Chaoyu Duan, Yangyang Peng, S. Fu, L. Lucia
{"title":"Investigation on the recycling of sulfuric acid from pretreatment of cellulose for nanocellulose preparation","authors":"Chaoyu Duan, Yangyang Peng, S. Fu, L. Lucia","doi":"10.32964//tj19.2.103","DOIUrl":"https://doi.org/10.32964//tj19.2.103","url":null,"abstract":"Sulfuric acid is often used to pretreat cellulose prior to homogenization and conversion to nanocellulose. It would be economically significant to reuse the acid to close the overall value chain loop. The target of this work was to investigate the effect of recovery and recycling frequency of sulfuric acid from the pretreatments on the pretreatment yield of water-insoluble cellulose solid residue, and to explore the relationship between the nanocellulose size prepared by recovery of acid and number of cycles. The surface properties of the nanocelluloses were measured, including content of sulfate groups, absolute zeta potential, crystallinity, and thermal stability.","PeriodicalId":296869,"journal":{"name":"February 2020","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122296224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
February 2020Pub Date : 2020-03-01DOI: 10.32964/tj19.2.63
R. Pelton, Dong-Woon Yang, Emil Gustafsson
{"title":"On increasing wet-web strength with adhesive polymers","authors":"R. Pelton, Dong-Woon Yang, Emil Gustafsson","doi":"10.32964/tj19.2.63","DOIUrl":"https://doi.org/10.32964/tj19.2.63","url":null,"abstract":"Fiber-fiber adhesion, called “bonding” in the old paper physics literature, is a critical component of the overall strength of dry paper. With freshly formed very wet pulp fiber webs, all evidence suggests there are no fiber-fiber crossings with significant adhesive joint strength. With water removal, a point will be reached where fiber-fiber adhesion starts to contribute to the overall wet-web strength.\u0000The literature reveals very few examples of polymers that increase fiber-fiber joint strength in freshly formed webs. Here, we summarize the literature and explain why it is so difficult to promote fiber-fiber wet adhesion with polymers. Nevertheless, ongoing research in areas as diverse as tissue engineering scaffolds and biomimetic adhe-sives gives clues to future developments. Advances in paper machine engineering have lessened the importance of wet-web strength. By contrast, a critical issue in many of the evolving nanocellulose technologies is the strength of objects first formed by aqueous processing, the green strength—the strength of wet bodies before drying. For exam-ple, 3-D printed nanocellulose objects and ultralow density cellulosic aerogels can be destroyed by capillary forces during drying. There is a need for adhesives that strengthen freshly formed, wet lignocellulosic joints.","PeriodicalId":296869,"journal":{"name":"February 2020","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121124693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
February 2020Pub Date : 2020-01-31DOI: 10.1144/geosci2020-063
{"title":"What's geology got to do with it?","authors":"","doi":"10.1144/geosci2020-063","DOIUrl":"https://doi.org/10.1144/geosci2020-063","url":null,"abstract":"","PeriodicalId":296869,"journal":{"name":"February 2020","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128172710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
February 2020Pub Date : 2020-01-31DOI: 10.1144/geosci2020-067
Jean N. Ure
{"title":"Marriage of true minds","authors":"Jean N. Ure","doi":"10.1144/geosci2020-067","DOIUrl":"https://doi.org/10.1144/geosci2020-067","url":null,"abstract":"","PeriodicalId":296869,"journal":{"name":"February 2020","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126317385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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