Hong Guo

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.

Dec 31, 2024 | mdpi.com | Hong Guo

3.4. XRD of the Samples During the Aging ProcessThe X-ray diffraction (XRD) patterns of the samples during aging under different conditions and after 200 days of aging are presented in Figure 8. The results reveal that all samples exhibit a prominent (200) diffraction peak near 22°, along with characteristic peaks corresponding to the 110 plane (approximately 15°) and the 040 plane (near 34°).

Nov 28, 2024 | mdpi.com | Wenjie Zhang |Shan Wang |Hong Guo

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Oct 17, 2024 | mdpi.com | Wenjie Zhang |Shan Wang |Hong Guo

All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.

Jul 15, 2024 | link.aps.org | Hang Liu |Tianjin Normal |Hong Guo

It was recently found that the optical field fluctuations in self-defocusing media can be described by sound waves propagating in a two-dimensional photon fluid. This photon fluid is controlled by the driving beam and serves as the background in which the sound waves can experience an effective curved spacetime, such that it provides a new platform of studying analog black holes.