In 2021, Thailand produced approximately 20 million tons of food waste, largely due to conventional packaging failing to extend food shelf life. Our research aims to address this by developing active packaging using hydrogels from nanocellulose (extracted from coconut husk waste) combined with silver nanoparticles (Ag-H). These Ag-H hydrogels, ranging from 0.008 to 0.030 phr, were evaluated for antimicrobial properties, and biocompatibility.Biocompatibility tests with the Caco-2 cell line showed that 0.015 phr concentration was deemed safe, with 82% cell viability, and selected for packaging use. Antimicrobial tests showed that all Ag-H concentrations inhibited gram-positive and gram-negative bacteria by up to 99.99%.Total volatile basic nitrogen (TVB-N) tests revealed that chicken meat preserved with Ag-H maintained grade 1 freshness for 6.4 days, compared to 3.9-4.2 days for control samples. Our findings suggest that Ag-H hydrogels can serve as effective active packaging, extending the shelf life of fresh products.In this report, we demonstrate how the stability and the mechanical behavior of transition-metal diborides, promising alternatives for hard and protective coating materials for cutting tools, can feasibly be improved via the presence of structural defects, in particular boron vacancies, by focusing mainly on tantalum diboride. The theoretical studies based on the first-principles calculations combined with the cluster-expansion method reveal the enhancement of the thermodynamic stability, shear strength, stiffness, and hardness of the diboride can be interpreted in terms of electronic band filling. The results shown in this reports are typically based on one of our recent work on boron-deficient tantalum diboride, i.e., Ektarawong, A., et al., J. Phys. Mater. 2023, 6, 025002.Stretchable conductive hydrogels have garnered considerable recognition due to their uses in strain sensors, electronic skins, soft robotics, and actuators. However, many hydrogels have poor mechanical properties limiting wide-spread implementation. While the development of ultrastretchable, and mechanically robust hydrogels remains a challenge, the fabrication of these materials with customized designs is also highly desirable. Herein, we report a direct-ink write 3D printable double-network (DN) hydrogel by integrating a physically-crosslinked κ-carrageenan, and a chemically-crosslinked poly(acrylamide-co-hydroxyethyl acrylate-co-Pluronic F127-bisurethane methacrylate), with an ionically cross-linked coordination between κ-carrageenan and Fe3+ ions in water-glycerol binary solvent. The DN hydrogel demonstrates excellent stretchability (1770% strain), remarkable toughness (6.24 MJ m-3), high ionic conductivity (1.55 S m-1), biocompatibility, and non-drying behavior. A variety of 3D printed constructs including auxetic structures were fabricated and used as a strain sensor. The sensor exhibited real-time electrical response to strain to detect human motions demonstrating the practicality of this system. These 3D printable DN hydrogels show great potential for on-demand fabrication of flexible health-monitoring devices. Intatch HONGRATTANA-VICHIT104105Annop EKTARAWONG106Benjaporn NARUPAIPreparation of antimicrobial and biodegradable cellulose nanofibers hydrogel from agro-waste for sustainable active packaging in fresh meat application(Project 2023)Crystal-Defect Engineering in Metal-Boride Thin Films for Hard-Coating Applications(Project 2023)3D Printing of Nondrying, Stretchable, Self-healable Ionic Conductive Hydrogels for Wearable Sensors(Project 2023)77
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