Jiajun Wang

1 month ago | nature.com | Jiajun Wang |Jiawei Chu |Ling Fang |Min Yu |Zhiguo Zhang |Junjun Zhu

This study presents an analysis of the anatomical structure of the archaeological bamboo, complemented by an examination of its chemical composition, structural characteristics, cellulose crystallinity, and thermal stability. The degraded fibre cell walls exhibited distinct porosity, indicative of the loss of secondary cell wall substances. Partial separation of the secondary wall layers from the middle lamella was observed in certain cell types. The results revealed a predictable diminution in hemicellulose and cellulose content, contrasted by an augmentation in relative lignin and ash content. The cellulose content and cellulose crystallinity index of archaeological bamboo were sharply reduced to 7.2% and 8.2%, respectively. Prolonged entombment had resulted in the predominant degradation of cellulose and hemicellulose in the unearthed bamboo, while lignin had remained relatively stable. At the same maximum water content (MWC), the bamboo underwent more severe degradation of carbohydrates, including the crystalline cellulose. These findings underscored the importance of understanding the degradation processes of bamboo, especially the changes in its chemical properties, in order to accurately assess its preservation state.

1 month ago | nature.com | Mengruo Wu |Jiake Chen |Xiangna Han |Jiajun Wang |Zhiguo Zhang |Hong Guo | +1 more

Lignin-like materials share chemical similarities with wood and exhibit excellent mechanical properties along with resistance to aging and microbial degradation. This study focuses on eugenol as a target lignin-like monomer. Three eugenol nanoemulsions with concentrations of 10%, 20%, and 30% were prepared using surfactant Pesticide Emulsifier 1602 and co-surfactant diethylene glycol mono butyl ether (DEGBE). Laccase facilitated the in-situ polymerization of eugenol on the cell walls of waterlogged archeological wood (WAW) from the Nanhai No.1 shipwreck at temperatures of 35 °C °C, 45 °C, and 55 °C for dehydration and consolidation purposes. The 30 wt% eugenol emulsion at 45 °C showed the best consolidation effectiveness, with a minimal shrinkage rate of 3.62% and a 400–1000% increase in bending strength compared to controls. The polymer reinforced the decayed wood while preserving cellular lumens, offering an innovative, environmentally sustainable conservation method for WAW.

Nov 18, 2024 | chemistry-europe.onlinelibrary.wiley.com | Yuwen Wang |Jiajun Wang |Shuang Liu |Xuan Zhang

Supporting Information As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors.

Feb 20, 2024 | onlinelibrary.wiley.com | Jinyang Li |Jiajun Wang |He Huang |Meng Gao

Conflict of Interest The authors declare no conflict of interest. Supporting Information Filename Description smll202400087-sup-0001-SuppMat.pdf2 MB Supporting Information References 1, , , , , , , Chem 2021, 7, 2312. 2, , , , , , , , , , , , , , , , , , Energy Storage Mater. 2023, 62, 102951. 3, , , , , , , ChemSusChem 2021, 14, 1659. 4, , , , , , , , , , Adv. Energy Mater. 2017, 7, 1602888. 5, , , , , , , , , , Small Methods 2022, 6, 2200148.

Feb 1, 2024 | pubs.rsc.org | Ziqi Xu |Jiaqi Liu |Jiajun Wang |Fang Wang

The fabrication of stretchable dual network P(HEMA-AM)/gelatin hydrogels as potential delivery carrier In the present work, self-adhesive and self-healing drug loaded poly (hydroxyethyl methacrylate-acrylamide)/gelatin hydrogels with dual networks were synthesized by a facile one-pot method crosslinked with dynamic hydrogen bond and metal-ligand interactions.