研究目的
To investigate the influence of polymer molecular weight on the properties of silver–methylcellulose nanocomposite films synthesized by the irradiation of a CO2 laser.
研究成果
The molecular weight of methylcellulose influences the properties of silver–methylcellulose nanocomposite films synthesized using a CO2 laser. Films with smaller molecular weight MC show stronger reduction power in the solution phase, but this difference is less clear in the matrix phase. Aggregation of Ag NPs is more serious in films with larger molecular weight MC. The antibacterial effect is stronger for films synthesized at lower laser power and shorter irradiation time.
研究不足
The study focuses on the influence of polymer molecular weight on the properties of silver–methylcellulose nanocomposite films. The effects of other factors such as the concentration of silver nitrate, the thickness of the films, and the environmental conditions during synthesis are not extensively explored.
1：Experimental Design and Method Selection:
The study employs a CO2 laser for the in situ synthesis of silver–methylcellulose nanocomposite films. The influence of polymer molecular weight on the properties of these films is investigated.
2：Sample Selection and Data Sources:
Two types of methylcellulose (MC) with different molecular weights (15 cP and 400 cP) are used. Silver nitrate is used as the precursor for silver nanoparticles.
3：List of Experimental Equipment and Materials:
CO2 laser (AL30P, Access Laser Co.), power meter (Pronto-250, Gentec-EO Co.), atomic force microscope (VN-8010, Keyence), scanning electron microscope (SEM) (JSM-6500FE, JEOL), Fourier Transform Infrared Spectroscopy (FTIR) (FT/IR-6200, JASCO).
4：Experimental Procedures and Operational Workflow:
AgNO3–MC solutions are prepared and spin-coated on glass substrates. The films are then irradiated with the CO2 laser at different powers and irradiation times. The synthesized films are characterized using UV–Vis spectroscopy, SEM, and FTIR. Antibacterial tests are performed using Escherichia coli.
5：Data Analysis Methods:
The size distributions of Ag NPs are analyzed using ImageJ software. The antibacterial properties are evaluated from the inhibited area around the Ag–MC films.
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