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Park, SungJun,Park, Hye Hun,Ko, Young-Seon,Lee, Su Jin,Le, The Son,Woo, Kyoungja,Ko, GwangPyo Elsevier 2017 Science of the Total Environment Vol.609 No.-
<P><B>Abstract</B></P> <P>Silver nanoparticles (AgNPs) have long been considered a powerful disinfectant for controlling pathogenic microorganisms. However, AgNPs might have adverse effects on both human health and our ecosystems due to their potential cytotoxicity and the difficulty in recovering them after their release into the environment. In this study, we characterized the antimicrobial efficacy caused by a novel micrometer-sized magnetic hybrid colloid (MHC) containing 7, 15, or 30nm sized monodispersed AgNPs (AgNP-MHCs), which can be re-collected from the environment using simple procedures, such as a magnet or centrifugation. We evaluated the antibacterial capabilities of AgNP-MHCs against target bacteria (<I>Legionella pneumophila, Bacillus subtilis</I>, <I>Escherichia coli</I>, and <I>Clostridium perfringens</I>) and compared them with the inactivation efficacy of AgNPs ~30nm in diameter (nAg30s). Among the different AgNP-MHCs composites evaluated, Ag30-MHCs had the greatest antibacterial effect. After 1h of exposure, more than a 4-log<SUB>10</SUB> reduction of <I>L. pneumophila</I> and 6-log<SUB>10</SUB> reduction of <I>B. subtilis</I> was achieved by 4.6×10<SUP>9</SUP> particles/mL of Ag30-MHCs and Ag30-MHC-Ls. In addition, Ag30-MHC-Ls maintained their strong antibacterial capabilities under anaerobic conditions. Our results indicate that AgNP-MHCs can be considered excellent tools for controlling waterborne bacterial pathogens, with a minimal risk of release into the environment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The use of AgNPs for controlling pathogens is hindered by several major obstacles. </LI> <LI> AgNP-MHCs can prevent the aggregation of AgNPs and be re-collected easily after use. </LI> <LI> AgNP-MHCs showed great antibacterial capabilities in various environmental conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Emerging Applications of Gallium-Based Liquid Metals
Sungjune Park(박성준) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The gallium-based liquid metals are appealing conductor for application in soft and stretchable electronics due to metallic conductivity while they are strained. The liquid metals spontaneously form the thin oxide layer (~3 nm) upon exposure to the oxygen. This oxide layer allows the metal to adhere to various substrates and to stabilize the shape in the air. Utilizing the oxide layer and fluidic property, the liquid metal can be patterned into the desired geometries by microfluidic injection, printing and molding. By utilizing liquid metal inclusions, the soft materials can manipulate the shape and function with metallic conductivity. In this presentation, we will discuss recent emerging applications of the gallium-based liquid metals such as soft, stretchable shape memory polymers with electrical conductivity, thermo- and mechanochromic fibers, stretchable sensors and reversible actuation of surface topography of the dielectric substrates.
Park, Sungjune,Lee, Dong-Hoon,Ryoo, Hyang-Im,Lim, Tae-Woo,Yang, Dong-Yol,Kim, Dong-Pyo Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.32
<P>Three-dimensional SiC ceramic microstructures with near-zero shrinkage were fabricated from a simple inorganic polymer mixture by inducing dual photocuring routes to produce highly dense polymer features by stereolithography and subsequent pyrolysis at 600 °C.</P> <P>Graphic Abstract</P><P>Three-dimensional SiC ceramic microstructures with near-zero shrinkage were fabricated from a simple inorganic polymer mixture by inducing dual photocuring routes to produce highly dense polymer features by stereolithography and subsequent pyrolysis at 600 °C. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b907923h'> </P>
Park, Sungjune,Park, Hyun-Ha,Han, Oc Hee,Chae, Seen Ae,Lee, Duhyun,Kim, Dong-Pyo Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.44
<P>We have developed a transparent, non-sticky silicate nano mold with high mechanical strength and excellent releasing properties through a simple phase conversion process of polyvinylsilazane (PVSZ) replica mold. This inexpensive inorganic polymer derived silicate mold does not require extra surface modification and could be used as an ideal mold with low adhesion force for nanoimprint lithographic applications. The silicate hard nano mold allows fabrication of sub-100 nm patterns down to 30 nm. The mold can be used for both UV and thermal NIL duplication processes in a repeated manner. The economic efficiency of the mold fabrication as well as the high durability and excellent releasing properties could be quite valuable to physical contact nanolithography for high-throughput fabrication of nano-devices.</P> <P>Graphic Abstract</P><P>We have developed a transparent, non-sticky silicate nano mold with high mechanical strength and excellent releasing properties through a simple phase conversion process of polyvinylsilazane (PVSZ) replica mold. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm01760d'> </P>
Antiviral Properties of Silver Nanoparticles on a Magnetic Hybrid Colloid
Park, SungJun,Park, Hye Hun,Kim, Sung Yeon,Kim, Su Jung,Woo, Kyoungja,Ko, GwangPyo American Society for Microbiology 2014 Applied and environmental microbiology Vol.80 No.8
<P>Silver nanoparticles (AgNPs) are considered to be a potentially useful tool for controlling various pathogens. However, there are concerns about the release of AgNPs into environmental media, as they may generate adverse human health and ecological effects. In this study, we developed and evaluated a novel micrometer-sized magnetic hybrid colloid (MHC) decorated with variously sized AgNPs (AgNP-MHCs). After being applied for disinfection, these particles can be easily recovered from environmental media using their magnetic properties and remain effective for inactivating viral pathogens. We evaluated the efficacy of AgNP-MHCs for inactivating bacteriophage ϕX174, murine norovirus (MNV), and adenovirus serotype 2 (AdV2). These target viruses were exposed to AgNP-MHCs for 1, 3, and 6 h at 25°C and then analyzed by plaque assay and real-time TaqMan PCR. The AgNP-MHCs were exposed to a wide range of pH levels and to tap and surface water to assess their antiviral effects under different environmental conditions. Among the three types of AgNP-MHCs tested, Ag30-MHCs displayed the highest efficacy for inactivating the viruses. The ϕX174 and MNV were reduced by more than 2 log<SUB>10</SUB> after exposure to 4.6 × 10<SUP>9</SUP> Ag30-MHCs/ml for 1 h. These results indicated that the AgNP-MHCs could be used to inactivate viral pathogens with minimum chance of potential release into environment.</P>