Improving properties of Hanji by coating chitosan-silver nanoparticle solution

Area of Science:

• Materials Science
• Nanotechnology
• Biomaterials

Background:

• Hanji, a traditional Korean paper, has limitations in mechanical strength, durability, and antimicrobial properties.
• Silver nanoparticles (AgNPs) exhibit potent antibacterial and functional properties.
• Chitosan serves as an effective, eco-friendly reducing and stabilizing agent for nanoparticle synthesis.

Purpose of the Study:

• To investigate the effects of chitosan-silver nanoparticle solution (CSNS) coating on Hanji paper properties.
• To determine the optimal dilution ratio of CSNS for enhancing specific Hanji paper characteristics.
• To evaluate the impact of CSNS coating on tensile strength, burst resistance, oil repellency, and antibacterial efficacy.

Main Methods:

• Chitosan-silver nanoparticle solution (CSNS) was synthesized using chitosan and AgNO3 via ultrasonication.
• CSNS was diluted to ratios of undiluted, 1/10, 1/100, and 1/1000.
• Hanji paper was coated with the diluted CSNS using a dip-coating method.
• Coated Hanji paper was tested for tensile strength, burst resistance, oil resistance, and antibacterial activity against Escherichia coli.

Main Results:

• CSNS coating significantly improved Hanji paper's tensile strength, burst resistance, and oil repellency.
• Optimal dilution ratios for enhancing properties were identified: 1/10 for tensile and oil resistance, 1/100 for burst resistance, and 1/1000 for antibacterial activity.
• Effective antibacterial properties against Escherichia coli were observed in coated Hanji paper.

Conclusions:

• Coating Hanji paper with CSNS is an effective strategy for property enhancement.
• Specific paper properties can be tailored by adjusting the CSNS dilution ratio.
• This method offers an economical approach to improving Hanji paper functionality for diverse applications.