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    One-Pot Synthesis of Aminated Bimodal Mesoporous Silica Nanoparticles as Silver-Embedded Antibacterial Nanocarriers and CO2Capture Sorbents
    (2022-11-23)
    Li, Yun
    ;
    Tiwari, Amit Kumar
    ;
    Ng, Jingyi Sandy
    ;
    Seah, Geok Leng
    ;
    Lim, Hong Kit
    Mesoporous silica nanoparticles have highly versatile structural properties that are suitable for a plethora of applications including catalysis, separation, and nanotherapeutics. We report a one-pot synthesis strategy that generates bimodal mesoporous silica nanoparticles via coassembly of a structure-directing Gemini surfactant (C16-3-16) with a tetraethoxysilane/(3-aminopropyl)triethoxysilane-derived sol additive. Synthesis temperature enables control of the nanoparticle shape, structure, and mesopore architecture. Variations of the aminosilane/alkylsilane molar ratio further enable programmable adjustments of hollow to core-shell and dense nanoparticle morphologies, bimodal pore sizes, and surface chemistries. The resulting Gemini-directed aminated mesoporous silica nanoparticles have excellent carbon dioxide adsorption capacities and antimicrobial properties against Escherichia coli. Our results provide an enhanced understanding of the structure formation of multiscale mesoporous inorganic materials that are desirable for numerous applications such as carbon sequestration, water remediation, and biomedical-related applications.
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    Cu- and Sn-Codoped Mesoporous BaTiO3-G-SiO2Nanocomposite for Bioreceptor-Free, Sensitive, and Quick Electrochemical Sensing of Rhizopus stolonifer Fungus
    (2022-04-26)
    Fatema, Kamrun Nahar
    ;
    Areerob, Yonrapach
    ;
    Meng, Ze Da
    ;
    Zhu, Lei
    ;
    Oh, Won Chun
    Rhizopus stolonifer produces large postharvest losses that account for about 80% of total losses in prepackaged and loose tomato fruits from Rhizopus rot. In this study, we effectively synthesized a Cu- and Sn-codoped mesoporous BaTiO3-G-SiO2 (CuSnBTGS) nanocomposite by utilizing a simple, low-cost self-assembly method for the electrochemical detection of Rhizopus stolonifer fungus; this method does not require a biological or chemical receptor or antibodies. We focused on the microstructure design of CuSnBTGS in combination with Cu and Sn codoping, which is widely regarded as the most efficient way to produce high-performance electrodes. The resultant CuSnBTGS composite exhibited excellent electrochemical characteristics and remarkable performance in the direct detection of Rhizopus stolonifer (bread fungus) levels in contaminated solutions. The chronoamperometric response of the CuSnBTGS composite electrode was linear with Rhizopus stolonifer fungus concentrations in the 50-100 μL range, with a lower detection limit of 0.50 μL. The sensor electrode demonstrated high sensitivity, repeatability, and selectivity. The findings show that Cu- and Sn-codoped mesoporous BTGS is a viable alternative to costly electrode materials, such as gold and platinum, for amperometric sensor applications, demonstrating its applicability in the agricultural and food safety sectors.
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