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Herein, we describe an encapsulation process that improves these properties, using a polyrhodanine shell material synthesized by oxidative polymerization. In this study, we synthesized and characterized curcumin/polyrhodanine nanocapsules (CPR-NCs) prepared with varying H2O2 amounts. By changing the rhodanine monomer ratio, the CPR-NC shell thickness, as observed by transmission electron microscopy, could be controlled. Release behavior of curcumin was characterized by UV-vis spectrometer. In according to the time, the absorbance of curcumin was gradually increased at 400nm(-1). And we were able to confirm that release concentration of curcumin over the six days in 67.33 %. For microbial disinfection test of curcumin, polyrhodanine, and CPR-NC, it was to conduct the analysis the Minimal Inhibition Concentration(MIC).
Curcumin (natural antimicrobial agent) became used in Indian traditional medicine and it is one of the three curcuminoids present in turmeric. Polyrhodanine (PRd, antimicrobial polymer) has attracted considerable attention in various application fields such as anticorrosion, antibacterial, and antihistaminic agents. In this study, we synthesized curcumin/ PRd nanoparticle with microbial disinfection property to release control by the encapsulation of natural antimicrobial agent and antimicrobial polymer. The size and morphology of curcumin/PRd nanoparticle were analyzed by DLS and FE-SEM(average 200 nm). The thermal stability of curcumin/PRd nanoparticle was confirmed by TGA. The release bahavior and synthetic mechanism of curcumin/PRd nanoparticle was demonstrated by UV-vis, HPLC(high performance liquid chromatography), FT-IR and XRD(X-ray diffraction).
Phase change material-polyurea (PCM-PU) nanocapsules were prepared by interfacial polycondensation. Morphology and inner structure of nanocapsules were observed by SEM and TEM method. Particle size distribution and heat storage of nanocapsules were analyzed by differential scanning calorimetry. PCM-Polymer nanofibers from poly(vinyl alcohol) were fabricated using electrospinning(ES) for heat storage nanofiber mats. PCM-PU-PEO nanofibers were characterized by scanning and transmission electron microscopy to confirm their surface morphology and coated layer structure2. Heat storage ability and thermal stability of nanofibers were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis(TGA) . PCM-polymer nanofibers were demonstrated good heat storage properties and expected to be excellent candidates for heat storage applications.
Phase change material-polystyrene (PCM-PSt) nanocapsules were prepared via a modified resin-fortified miniemulsion (RFME) polymerization process using an alkali soluble resin (ASR). Poly(styrene-co-acrylic acid) (SAA), which is a functional amphiphilic polymer, was used as the surfactant for the resin-fortified emulsion polymerization. A co-surfactant and a crosslinker were adopted to improve the PCM encapsulation efficiency. The average particle size and heat capacity of the optimized PCM-PSt nanocapsules were about ~280 nm as measured by dynamic light scattering (DLS) and ~110 J/g as measured by differential scanning calorimetry (DSC), respectively. The morphology and the inner structure of the nanocapsules were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The synthesized nanocapsules showed good adhesive and thermal storage properties, and were amenable for processing by dip-coating methods.