A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Intelligent response organo-montmorillonite/Fe3+-alginate/poly (N-isopropylacrylamide) interpenetrating network composite hydrogels for controlled release of water-insoluble pesticides
Abstract Enclosing the pesticide in a carrier and releasing it based on environmental stimuli is proved to be a viable strategy for addressing pesticide losses and mitigating environmental contamination. Here, an interpenetrating network (IPN) composite hydrogels (OMt/Alg/PNIPAm) with light and temperature responses was prepared by the incorporation of clay material, organo-montmorillonite (OMt), via the free-radical polymerization of N-isopropyl acrylamide (PNIPAm) and its crosslinking as well as ionic crosslinking reaction of sodium alginate (SA) with FeCl3. The structure of OMt/Alg/PNIPAm was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermos gravimetric analysis (TGA) and rheometer. The hydrophobic pesticide λ-cyhalothrin (LC) was encapsulated in OMt and subsequently incorporated into the IPN structure of the composite hydrogels, ensuring the desirable mechanical properties, encapsulation efficiency and sustained release performances of the composite hydrogels. In addition, with the rising of OMt content, the IPN composite hydrogels exhibited a decrease in their swelling capacity, transparency, and temperature sensitivity. The OMt/Alg/PNIPAm with 9.0% OMt content displayed the highest loading rate for pesticides at 82.06% and the lowest release rate of pesticides at 3.90%. Furthermore, the IPN composite hydrogels possessed the ability to regulate the amount of pesticide release based on the variations in temperature and ambient light conditions. The resultant IPN composite hydrogels took advantage of the temperature responsiveness of PNIPAm, the light sensitivity of Fe3+-alginate hydrogel, and the adsorption capability of OMt, possessing great potentials in enhancing the utilization efficiency of hydrophobic pesticides through the development of effective and eco-friendly pesticide formulations.
Graphical abstract Display Omitted
Highlights The intelligent OMt/Alg/PNIPAm with light and temperature response were prepared via IPN method. The chemical crosslinking of PNIPAm and ionic crosslinking of SA achieved IPN composite hydrogels. OMt was used to improve the mechanical property and drug-loading rate of the OMt/Alg/PNIPAm. The OMt/Alg/PNIPAm could regulate the pesticide release in response to environmental stimuli. The OMt/Alg/PNIPAm could be preferably used as potential hydrophobic pesticide carriers.
Intelligent response organo-montmorillonite/Fe3+-alginate/poly (N-isopropylacrylamide) interpenetrating network composite hydrogels for controlled release of water-insoluble pesticides
Abstract Enclosing the pesticide in a carrier and releasing it based on environmental stimuli is proved to be a viable strategy for addressing pesticide losses and mitigating environmental contamination. Here, an interpenetrating network (IPN) composite hydrogels (OMt/Alg/PNIPAm) with light and temperature responses was prepared by the incorporation of clay material, organo-montmorillonite (OMt), via the free-radical polymerization of N-isopropyl acrylamide (PNIPAm) and its crosslinking as well as ionic crosslinking reaction of sodium alginate (SA) with FeCl3. The structure of OMt/Alg/PNIPAm was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermos gravimetric analysis (TGA) and rheometer. The hydrophobic pesticide λ-cyhalothrin (LC) was encapsulated in OMt and subsequently incorporated into the IPN structure of the composite hydrogels, ensuring the desirable mechanical properties, encapsulation efficiency and sustained release performances of the composite hydrogels. In addition, with the rising of OMt content, the IPN composite hydrogels exhibited a decrease in their swelling capacity, transparency, and temperature sensitivity. The OMt/Alg/PNIPAm with 9.0% OMt content displayed the highest loading rate for pesticides at 82.06% and the lowest release rate of pesticides at 3.90%. Furthermore, the IPN composite hydrogels possessed the ability to regulate the amount of pesticide release based on the variations in temperature and ambient light conditions. The resultant IPN composite hydrogels took advantage of the temperature responsiveness of PNIPAm, the light sensitivity of Fe3+-alginate hydrogel, and the adsorption capability of OMt, possessing great potentials in enhancing the utilization efficiency of hydrophobic pesticides through the development of effective and eco-friendly pesticide formulations.
Graphical abstract Display Omitted
Highlights The intelligent OMt/Alg/PNIPAm with light and temperature response were prepared via IPN method. The chemical crosslinking of PNIPAm and ionic crosslinking of SA achieved IPN composite hydrogels. OMt was used to improve the mechanical property and drug-loading rate of the OMt/Alg/PNIPAm. The OMt/Alg/PNIPAm could regulate the pesticide release in response to environmental stimuli. The OMt/Alg/PNIPAm could be preferably used as potential hydrophobic pesticide carriers.
Intelligent response organo-montmorillonite/Fe3+-alginate/poly (N-isopropylacrylamide) interpenetrating network composite hydrogels for controlled release of water-insoluble pesticides
Wang, Hongcai (author) / Chen, Xiuqiong (author) / Gong, Cuiyu (author) / Bu, Yanan (author) / Wu, Ting (author) / Yan, Huiqiong (author) / Lin, Qiang (author)
Applied Clay Science ; 251
2024-02-15
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2011
Synthesis and Adsorption of Organo-montmorillonite/Poly(acrylic acid) Superabsorbent Composite
| British Library Online Contents | 2013
| British Library Online Contents | 2014
Interpenetrating Polymer Network PVA/PAA Hydrogels
| British Library Online Contents | 2006