A5020321183- Advanced Sensor and Energy Harvesting Materials
- Electrospun Nanofibers in Biomedical Applications
- Surface Modification and Superhydrophobicity
- Adhesion, Friction, and Surface Interactions
- 3D Printing in Biomedical Research
- Additive Manufacturing and 3D Printing Technologies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Materials and Mechanics
- Antimicrobial agents and applications
- Polymer Surface Interaction Studies
- Fluid Dynamics and Heat Transfer
- biodegradable polymer synthesis and properties
- Supramolecular Self-Assembly in Materials
- Antibiotic Resistance in Bacteria
- Polydiacetylene-based materials and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Material Properties and Applications
- Nanocomposite Films for Food Packaging
- Nonlinear Optical Materials Studies
- Tissue Engineering and Regenerative Medicine
- Essential Oils and Antimicrobial Activity
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Polymer composites and self-healing
- Infection Control in Healthcare
- Nanofabrication and Lithography Techniques
Singapore University of Technology and Design
2015-2024
Pillar College
2016
Colorado State University
2011-2014
Four-dimensional (4D) printing of shape memory polymer (SMP) imparts time responsive properties to 3D structures. Here, we explore 4D a SMP in the submicron length scale, extending its applications nanophononics. We report new photoresist based on Vero Clear achieving print features at resolution ~300 nm half pitch using two-photon polymerization lithography (TPL). Prints consisting grids with size-tunable multi-colours enabled study effects achieve large visual shifts through nanoscale...
Quest for efficient fog harvesting methods has drawn immense attention in recent times. In this study, electrospinning is used to fabricate three different sets of membranes that are based on pristine poly( N ‐isopropylacrylamide) (PNIPAM) fibers, polyvinylidene fluoride (PVDF) and PNIPAM‐PVDF bead‐on‐string fibers. The wettability these investigated as a function temperature the effect their collection efficiency determined. Membranes PNIPAM PVDF fibers fabricated using conventional shown...
Collection of clean water from humid air has attracted immense attention in recent years due to the lack access pure drinking among large section population several parts world. Hence, there is a persistent demand for fabrication robust, scalable membranes efficient harvesting water, especially fog-laden areas. Herein, three different based on neat nanofibers, nanofibers with microparticles, and hierarchical structures (nanopillars) are successfully fabricated using poly(vinylidene...
Reconfigurable metamaterials require constituent nanostructures to demonstrate switching of shapes with external stimuli. Yet, a longstanding challenge is in overcoming stiction caused by van der Waals forces the deformed configuration, which impedes shape recovery. Here, we introduce stiff memory polymers. This designer material has storage modulus ∼5.2 GPa at room temperature and ∼90 MPa rubbery state 150 °C, 1 order magnitude higher than those previous reports. Nanopillars diameters ∼400...
Abstract Despite recent advances in biofabrication, recapitulating complex architectures of cell‐laden vascular constructs remains challenging. To date, biofabricated models have not yet realized four fundamental attributes native vasculatures simultaneously: freestanding, branching, multilayered, and perfusable. In this work, a microfluidics‐enabled molding technique combined with coaxial bioprinting to fabricate anatomically relevant, consisting hydrogels is developed. By using 3D porous...
In this study, we used core-shell electrospinning to fabricate cellulose acetate-poly(N-isopropylacrylamide) (CA-PNIPAM) fibrous membranes and demonstrated the ability of these fibers capture water from a high humid atmosphere release it when thermally stimulated. The wettability was controlled by using thermoresponsive PNIPAM as shell layer. Scanning electron fluorescence microscopes are investigate microstructure confirm presence core phases within fibers. moisture capturing releasing...
Abstract Electrospinning is employed to fabricate a Janus membrane that demonstrates hydrophobic behavior on one surface and hydrophilic the other. The fabricated by electrospinning polyvinylidene fluoride (PVDF) top of membrane. poly( N ‐isopropylacrylamide) (PNIPAM) PVDF blend solution. This exhibits water separation efficiency over 99.5% at an ultra‐low hydrostatic pressure 0.7 kPa. results demonstrate can be used separate both oil from in emulsions. layer selectively reduces liquid entry...
Abstract Temperature-triggered switchable nanofibrous membranes are successfully fabricated from a mixture of cellulose acetate (CA) and poly(N-isopropylacrylamide) (PNIPAM) by employing single-step direct electrospinning process. These hybrid CA-PNIPAM demonstrate the ability to switch between two wetting states viz. superhydrophilic highly hydrophobic upon increasing temperature. At room temperature (23 °C) exhibit superhydrophilicity, while at elevated (40 hydrophobicity with static water...
Separation of low viscous oil from water has attracted immense attention in recent times due to the ever‐increasing amount oily industrial wastewater discharge and frequent spill accidents. Hence, there is a persistent demand for fabrication robust oil–water separation membranes. Herein, membranes are successfully fabricated by direct electrospinning poly(vinylidene fluoride‐ co ‐hexafluoropropylene) fluorinated polyhedral oligomeric silsesquioxane composite mixture. These hybrid exhibit...
In a hospital environment, textile substrates have been implicated as vector in the transmission of disease. To mitigate harmful spread disease via substrates, an effective measure is treatment textiles with antimicrobial agents. The current investigation compares one most widely used chemically synthesized agents, triclosan chitosan, naturally occurring agent. For study, samples common polyester/cotton settings were treated and chitosan based Following treatment, analyzed for their...
This study investigated the switchable wettability behavior of poly-N-(isopropyl acrylamide) (PNIPAM) and poly-(vinylidene fluoride) (PVDF) blend membranes that were fabricated using electrospinning. The was determined by water contact angle measurements. controlled varying concentration PNIPAM in blend. results demonstrated addition PVDF to did not change thermoresponsive PNIPAM. All PNIPAM/PVDF samples switched from hydrophilic hydrophobic state when temperature increased room 40 °C....
Polypropylene nonwoven fabrics samples were modified using poly(2-(N,N-dimethyloamino ethyl) methacrylate) (PDAMA) and silver-containing layers. The structure of the material after modification was confirmed scanning electron mocroscope, energy-dispersive X-ray spectroscopy, Fourier Transfer Infrared Spectroscopy (FTIR), electro-kinetic measurements. It found that with external PDAMA layers have excellent activity against Staphylococcus aureus under dynamic contact conditions. In contrast,...
Fabrication of hierarchical PMMA fibrous structures through electrospinning and post AAO templating.
ABSTRACT Herein, the fabrication of poly(vinylidene fluoride) (PVDF) fibrous membrane using electrospinning is reported and its use for dry‐adhesive applications demonstrated. The shear normal adhesion performance samples was investigated an Instron tensile tester atomic force microscope (AFM) respectively. For measurements, electrospun finger pressed on to a glass slide pulled in mode tester. thickness varied effect investigated. strength increased when reduced. Shear 200 µm thick sample...
Emerging quantum technologies that critically require the integration of emitters on photonic platforms are hindered by control over their position, quantity, and scalability. Herein, we describe a facile strategy to deposit aqueous silica-coated dots (QDs) in template polymethyl methacrylate (PMMA) nanoholes leverages saturated ethanol vapor drop-casting subsequent lift-off template. Ethanol incorporation into water droplets during drying process reduces meniscus contact angle, which...
Abstract Recent progress in additive manufacturing has enabled the application of stereolithography (SLA) bioprinting to produce 3D biomimetic structures. Bioinks for SLA often require synthetic polymers as supplements ensure structural integrity printed cell‐laden constructs. High molecular weight (MW) poly(ethylene‐glycol)‐diacrylate (PEGDA) (MW ≥ 3400 Da) is commonly used enhance mechanical property crosslinked hydrogels. However, production bioink with high MW PEGDA requires in‐house...
Wearing comfort of apparel is highly dependent on moisture management and respective transport properties the textiles. In today's used textiles, water vapor transmission (WVT) depends primarily porosity wettability clothing layer next to skin not adapting or responsive environmental conditions. The WVT inevitably same from both sides membrane. this study, we propose a novel approach by development thermoresponsive Janus membrane using electrospinning procedures. We, therefore, targeted as...