High concentrations of pigment powders present significant challenges for dispersion stability in cosmetic formulations, the dispersion of iron oxide yellow paste may lead to flocculation, reducing its stability. This study employed octenyl succinate starch (OSA starch) and Arabic gum (AG) as composite wall materials to encapsulate iron oxide yellow and to optimize the dispersion system for water-soluble pigment powders. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) confirmed the formation of a well-structured microcapsule, significantly smaller than the original iron oxide yellow particles. Accelerated stability tests indicated that the microcapsule structure enhanced system stability, with improved performance observed at higher OAF solution concentrations. The contact angle measurements, which were consistently below 90°, demonstrated that the microcapsule structure enhanced the wettability and hydrophilicity of the OAF solution, thereby improving skin adhesion. The encapsulation of iron oxide yellow using OSA starch and AG underscores the potential application of natural hydrocolloids and modified starches in the cosmetics industry.
Yuhan Tian,Jiachun Zhong,Linqing Hu,Xiaoyi Zheng,Jie Cheng,Zejun Pu
In this work, a facilitated physical dispersion technology was employed to prepare polymer-based antistatic composites using polyethersulfone (PES) as matrix and the acidulated multiwalled carbon nanotube (MWCNT) as nanofillers, scattering the PES resin in the deionized water contained MWCNT by the colloid mill to obtain MWCNT/PES emulsion and the MWCNT/PES composites were prepared by melt processing. The influence of dispersion technology about the MWCNT/PES composites on the mechanical, thermal, and electrical properties was investigated in detail. The morphology of the MWCNT/PES emulsion was investigated by transmission electron microscopy and scanning electron microscope, respectively. The results showed that the MWCNT nanoparticles were encapsulated in the PES microspheres homogeneously. In addition, the obtained MWCNT/PES composites showed higher glass transition temperature ( T g ) and initial thermal decomposition temperature ( T 5% ). More importantly, the tensile strength and surface resistance of 3 wt% MWCNT/PES composites were up to 112 MPa and 10 6 Ω/m, respectively. Therefore, these high-performance polymer-based antistatic composites will have potential application in electronic devices applied with high temperature conditions.
We demonstrate a rapid and robust method to fabricate uniform core–shell photonic crystal (PC) microbeads by the microfluidic and centrifugation–redispersion technique. Colored crystalline colloidal arrays (CCAs) were first prepared through centrifugation–redispersion approach by self-assembly of polystyrene–poly(N-isopropylacrylamide) (PS–PNIPAm) core/shell nanoparticles (NPs). Different from the conventional NPs (e.g., charged PS or PNIPAm NPs), PS–PNIPAm NPs could easily self-assemble into well-ordered CCAs by only one purification step without laborious pretreatment (e.g., dialysis or ion exchange) or slow solvent-evaporation process. The CCAs is then encapsulated into a transparent polymer shell with functional groups (e.g., copolymer of ETPTA and butyl acrylate (BA)), triggering the formation of core–shell PC microbeads which can be used as optical encoding microcarriers. Importantly, this technique allows us to produce core–shell PC microbeads in a rapid and robust way, and the optical reflections of the PC microbeads appear highly stable to various external stimuli (e.g., temperature, pH value, and ionic strength) relying on the features of the CCAs core and protection of the polymer shell. Moreover, various probe biomolecules (e.g., proteins, antibodies, and so on) can be easily linked on the surface of the core–shell PC microbeads owing to the hydrophilic modification induced by the hydrolysis of BA on the microbead surface, enabling the multiplex biomolecular detection.
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