A5065091493- Nanoplatforms for cancer theranostics
- Photodynamic Therapy Research Studies
- Surface Modification and Superhydrophobicity
- Nanoparticles: synthesis and applications
- Infection Control and Ventilation
- Indoor Air Quality and Microbial Exposure
- Antimicrobial agents and applications
- Advanced Nanomaterials in Catalysis
- Advanced Sensor and Energy Harvesting Materials
- Nanocluster Synthesis and Applications
- Air Quality and Health Impacts
- Advanced Photocatalysis Techniques
- Mass Spectrometry Techniques and Applications
- Luminescence and Fluorescent Materials
- Electrohydrodynamics and Fluid Dynamics
- Microfluidic and Bio-sensing Technologies
- Icing and De-icing Technologies
- Bioactive natural compounds
- Skin Protection and Aging
- Medicinal Plants and Neuroprotection
- Adhesion, Friction, and Surface Interactions
- Aerosol Filtration and Electrostatic Precipitation
- Gold and Silver Nanoparticles Synthesis and Applications
- Essential Oils and Antimicrobial Activity
- Air Quality Monitoring and Forecasting
University College London
2015-2024
Transnational Press London
2016
Korea University of Science and Technology
2015
Korea Institute of Science and Technology
2009-2015
Korea University
2015
Konkuk University
2009-2011
Korea Advanced Institute of Science and Technology
2010
University of Minnesota
2010
Seoul National University
2009
Korean Association Of Science and Technology Studies
2009
Superhydrophobic surfaces are present in nature on the leaves of many plant species. Water rolls these surfaces, and rolling motion picks up particles including bacteria viruses. Man-made superhydrophobic have been made an effort to reduce biofouling. We show here that anti-biofouling property a surface is due entrapped air-bubble layer reduces contact between surface. Further, we showed prolonged immersion water led loss bubble-layer subsequent bacterial adhesion unexpectedly exceeded...
A superhydrophobic paint was fabricated using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES), TiO2 nanoparticles and ethanol. The has potential for aquatic application of a coating as it induces increased buoyancy drag reduction. Buoyance testing showed that the reduction surface energy by made feasible glass, high density material, supported tension water. In miniature boat sailing test, shown low treatment decreased adhesion water molecules to resulting in force. Additionally, robust...
Carbon nanotubes (CNTs) have been widely used in a variety of applications because their unique structure and excellent mechanical electrical properties. Additionally, silver (Ag) nanoparticles exhibit broad-spectrum biocidal activity toward many different bacteria, fungi, viruses. In this study, we prepared Ag-coated CNT hybrid (Ag/CNTs) using aerosol nebulization thermal evaporation/condensation processes tested usefulness for antimicrobial air filtration. Droplets were generated from...
A mechanically robust and damage/contamination recoverable superhydrophobic surface consisting of UHMWPE PFOTES/TiO 2 NPs.
Abstract The emergence of antibiotic resistant bacteria is a major threat to the practice modern medicine. Photobactericidal agents have obtained significant attention as promising candidates kill bacteria, and they been extensively studied. However, obtain photobactericidal activity, an intense white light source or UV-activation usually required. Here we report polymer containing crystal violet (CV) thiolated gold nanocluster ([Au 25 (Cys) 18 ]) activated at low flux levels light. It was...
Recently, bioaerosols, including the 2019 novel coronavirus, pose a serious threat to global public health. Herein, we introduce visible-light-activated (VLA) antimicrobial air filter functionalized with titanium dioxide (TiO2)-crystal violet (CV) nanocomposites facilitating abandoned visible light from sunlight or indoor lights. The TiO2-CV based VLA filters exhibit potent inactivation rate of ∼99.98% and filtration efficiency ∼99.9% against various bioaerosols. Under visible-light, CV is...
We explore a series of Zn and N codoped TiO2 thin films grown using chemical vapor deposition. Films were prepared with various concentrations (0.4–2.9 at. % vs Ti), their impact on superoxide formation, photocatalytic activity, bactericidal properties determined. Superoxide (O2•–) formation was assessed 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)carbonyl]-2H-tetrazolium sodium salt (XTT) as an indicator, activity determined from the degradation stearic acid under UVA light,...
Outbreaks of airborne pathogens pose a major threat to public health. Here we present single-step nanocoating process endow commercial face mask filters with photobiocidal activity, triboelectric filtration capability, and washability. These functions were successfully achieved composite nanolayer silica-alumina (Si-Al) sol-gel, crystal violet (CV) photosensitizer, hydrophobic electronegative molecules 1H, 2H, 2H-perfluorooctyltriethoxysilane (PFOTES). The transparent Si-Al matrix strongly...
In this study, a superhydrophobic coating on glass has been prepared through single-step aerosol-assisted chemical vapor deposition (AACVD) process. During the process, an aerosolized precursor containing polydimethylsiloxane, epoxy resin, and stearic acid functionalized Al-doped ZnO nanoparticles was deposited onto at 350 °C. X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy showed that successfully coated formed nano/microstructure (surface roughness:...
Bacterial adhesion and proliferation on surfaces are a challenge in medical industrial fields. Here, simple one-step technique is reported to fabricate self-cleaning bactericidal surfaces. White, blue, violet paints were produced using titanium dioxide nanoparticles, 1H,1H,2H,2H-perfluorooctyltriethoxysilane, crystal violet, toluidine Blue O, ethanol solution. All of the painted showed superhydrophobicity air, even after hexadecane oil contamination, they retained water repellency...
Controlling bioaerosols has become more important with increasing participation in indoor activities. Treatments using natural-product nanomaterials are a promising technique because of their relatively low toxicity compared to inorganic such as silver nanoparticles or carbon nanotubes. In this study, antimicrobial filters were fabricated from natural Euscaphis japonica nanoparticles, which produced by nebulizing E. extract. The coated assessed terms pressure drop, activity, filtration...
The development of photoactivated antimicrobial surfaces that kill pathogens through the production singlet oxygen has proved very effective in recent years, with applications medical devices and hospital touch surfaces, to improve patient safety well being. However, many these require a swell-encapsulation-shrink strategy incorporate photoactive agents polymer matrix, this is resource intensive, given only surface fraction agent active against bacteria. Furthermore, there risk will leach...
We investigated nanoparticle generation from a natural plant extract using the aerosol technique of nebulization-thermal drying process, and tested its usefulness for antimicrobial air filtration. Sophora flavescens Ait. ethanolic was prepared as an natural-product suspension. Suspension droplets were generated single-jet Collison nebulizer, passed through active carbon absorber to remove ethanol, mixed dried with sheath air. For drying, particles exposed 200°C ∼1 s. Finally, introduced into...
In this study, the drop-on-demand patterning of bacterial cells on a raw silicon wafer was newly conducted with an electrospray pulsed jet. We produced various sized line patterns and spot under varying experimental conditions frequency, flow rate, translational speed system in one two-dimensional ways. Especially, electrospray's jet solution regular around 10 μm diameter spots, each which contained single cell. By enabling manipulation gas phase, new technique broadens scope biological...
Crystal violet (CV) was incorporated into acrylic latex to produce white-light-activated antimicrobial paint (WLAAP). Measurement of the water contact angle WLAAP showed that increased with increasing CV concentration. In a leaching test over 120 h, amount leached from WLAAPs close detection limit (<0.03%). The were used coat samples polyurethane, and these bactericidal activity against Escherichia coli, which is key causative agent healthcare-associated infections (HAIs). A reduction in...
Toluidine blue O (TBO) dye together with either silver (Ag) nanoparticles (NPs), gold (Au) NPs, or a mixture of Ag and Au NPs (Mix Ag-Au NPs) were incorporated into polyurethane to make antimicrobial surfaces using swell-encapsulation-shrink process. Antimicrobial testing against Escherichia coli showed that inclusion the significantly enhanced activities TBO samples. In particular, samples containing exhibited potent activity under white light surprisingly, also in dark. The numbers viable...
Biofilms which are self-organized communities can contaminate various infrastructural systems. Preventing bacterial adhesion on surfaces is more desirable than cleaning or disinfection of bacteria-contaminated surfaces. In this study, a 24 h test showed that “slippery surfaces” had increased resistance to contamination compared polydimethylsiloxane and superhydrophobic However, it did not completely inhibit attachment, indicating only retards surface by bacteria. Hence, strategy killing...
The ultraviolet aerodynamic particle sizer (UVAPS) spectrometer is a novel, commercially available aerosol counter for real-time, continuous monitoring of viable bioaerosols based on the fluorescence induced from living microorganisms. For aerosolization liquid-based microorganisms, general methods such as atomization or nebulization may not be adequate an accurate and quantitative characterization microorganisms because formation agglomerated particles. In cases, biological electrospray...