Facile Template Synthesis of Microfibrillated Cellulose/Polypyrrole/Silver Nanoparticles Hybrid Aerogels with Electrical Conductive and Pressure Responsive Properties

Abstract

Sustainable microfibrillated cellulose (MFC) aerogels are considered to be good templates for the growth of functional organic or inorganic nanoparticles. In this work, MFC aerogels with high porosity (99.9%) and low density (2.91 mg/cm 3 ) were produced by freeze-drying. Then the obtained MFC aerogels were used as templates for the synthesis of MFC/polypyrrole (PPy)/silver nanoparticles (Ag) hybrid aerogels by a simple dip-coating method. Our results demonstrated that the obtained hybrid aerogels maintained the attractive features of the pristine MFC aerogels, such as high porosity, low density, and high compressive stress, during the preparation process. Compared with MFC aerogels and MFC/ PPy hybrid aerogels, the MFC/PPy/Ag hybrid aerogels exhibited enhanced antimicrobial and electrical conductive properties due to the combination of PPy and Ag. Moreover, the electrical conductivity and compressible properties of the MFC/PPy/Ag hybrid aerogels led to their pressure responsive property. These features make the hybrid aerogels promising candidates for wound healing, energy storage, and pressure sensing applications.

Cellulose nanofiber backboned Prussian blue nanoparticles as powerful adsorbents for the selective elimination of radioactive cesium

“…The band at 1059–1162 cm −1 corresponds to C-O and C-O-C stretching bond in the CNF. Peaks at 1631 cm −1 and 890 cm −1 corresponds to the C=O stretching and glycoside linkage in cellulose respectively21353637. The characteristic sharp peak of the Fe-CN stretching vibration at 2072 cm −1 in the CNF/PB FT-IR spectrum confirms the presence of PB.…”

“…The degradation of CNF starts from 190 °C and is a maximum at 304 °C, and is complete at 357 °C. But in the case of CNF-Ferric (III) and CNF/PB, the thermal degradation is slightly shifted to lower temperature, because of the loss of the primary hydroxyl group and the intermolecular water molecule during complexation3645. The thermal degradation of CNF/PB has two major steps: Step 1 (145–265 °C) and Step 2 (265–435 °C).…”

Advanced Materials through Assembly of Nanocelluloses

“…At each step, a monolayer coverage is pursued toward complete chemical conversion, followed by purging of the chemically unreacted reagents. Related to nanocelluloses, the natural platform is based on nanocellulose aerogels, which have amply been studied during recent years . Their nanoscopic skeletons are functionalized with different inorganic oxides using ALD, such as Al 2 O 3 , ZnO, or TiO 2 , see Figure .…”

Antibacterial Polymeric Films Fabricated by [2+2] Cycloaddition–Retroelectrocyclization and Ag+ Ion Coordination

“…Among the several different proposed mechanisms of the antibacterial activities, Ag + ions usually inactivate enzymes and proteins by interacting with their thiol groups. Polymeric materials containing Ag + ions or Ag nanoparticles (films, membranes, fibers, and gels) and their coatings on various materials have been the target of these types of studies . However, difficulties in homogeneously dispersing Ag + salts into polymeric materials remained due to the poor miscibility of inorganic salts within organic polymers.…”

“…Polymeric materials containing Ag + ions or Ag nanoparticles (films, membranes, fibers, and gels) and their coatings on various materials have been the target of these types of studies. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] However, difficulties in homogeneously dispersing Ag + salts into polymeric materials remained due to the poor miscibility of inorganic salts within organic polymers. The Ag + salts partially release Ag + ions at certain stages, but the poor diffusibility of the Ag + ions over hydrophobic non-polar polymers often reduces the antibacterial activities.…”