A5017592367- Additive Manufacturing and 3D Printing Technologies
- 3D Printing in Biomedical Research
- Innovative Microfluidic and Catalytic Techniques Innovation
- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Metal and Thin Film Mechanics
- Electrohydrodynamics and Fluid Dynamics
- Advanced Thermoelectric Materials and Devices
- Microfluidic and Capillary Electrophoresis Applications
- biodegradable polymer synthesis and properties
- Advanced Sensor and Energy Harvesting Materials
- Surface Modification and Superhydrophobicity
- Electrowetting and Microfluidic Technologies
- Nanomaterials and Printing Technologies
- Mass Spectrometry Techniques and Applications
- Innovations in Concrete and Construction Materials
- Thermal properties of materials
- Advanced Data Storage Technologies
- Pickering emulsions and particle stabilization
- Pancreatic function and diabetes
- Hydrogen Storage and Materials
- Synthesis and Properties of Aromatic Compounds
- Thermal Radiation and Cooling Technologies
- Molecular spectroscopy and chirality
Institute of Materials Research and Engineering
2022-2025
Agency for Science, Technology and Research
2022-2025
Institute of Chemical and Engineering Sciences
2023
Nanyang Technological University
2023
Singapore University of Technology and Design
2019-2022
Indian Institute of Technology Bombay
2014-2020
National Chemical Laboratory
2008-2012
Abstract A conducting drop suspended in a viscous dielectric and subjected to uniform DC electric field deforms steady-state shape when the stress balance. Beyond critical capillary number $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq \ge =\geqslant \geq \def \Pr {\mathit {Pr}}\def \Fr {Fr}}\def \Rey {Re}}\mathit{Ca}$ , which is ratio of stress, undergoes breakup. Although deformation independent viscosity $\lambda $ medium phase, breakup itself...
Recent advances in three-dimensional (3D) printing technology has enabled to shape food unique and complex 3D shapes. To showcase the capability of printing, chocolates have been commonly used as inks, based on hot-melt extrusion demonstrated model chocolate products. Although is simple, requires precise control over operating temperature a narrow range. In this work, for first time, we directly printed chocolate-based inks its liquid phase using direct ink writing (DIW) printer shapes...
High entropy alloys (HEAs), consisting of five or more elements with nearly equal atomic composition one another (5–35%), are new-generation that have attracted significant interest since their advent in 2004 because unique structural and mechanical properties thermodynamic chemical stability. Some characteristics, including high strength at elevated temperatures, ductility fracture toughness cryogenic temperatures corrosion, erosion wear resistance, been demonstrated for HEAs outperform...
Abstract Surface wetting is a multiscale phenomenon where properties at the macroscale are determined by features much smaller length scales, such as nanoscale surface topographies. Traditionally, of surfaces quantified macroscopic contact angle that liquid droplet makes, but this approach suffers from various limitations. In recent years, several techniques have been developed to address these shortcomings, ranging direct measurements pinning forces using cantilever-based force probes...
This review paper examines the innovative use of liquid crystals (LCs) as phase change materials in thermal energy storage systems. With rising demand for efficient storage, LCs offer unique opportunities owing to their tunable transitions, high latent heat, and favorable conductivity. covers various types LCs, such nematic, smectic, cholesteric phases, roles enhancing storage. It discusses mechanisms LC transitions impact on efficiency. Strategies improve conductivities polymers have also...
We developed a method to perform direct ink writing (DIW) three-dimensional (3D) printing of milk products at room temperature by changing the rheological properties ink. 3D food has been demonstrated different methods such as selective laser sintering (SLS) and hot-melt extrusion. Methods requiring high temperatures are, however, not suitable creating models consisting temperature-sensitive nutrients. Milk is an example foods rich in nutrients calcium protein that would be sensitive....
An unprecedented route of DIW 3D printing a polymer-solvent-nonsolvent ternary system to fabricate structures with controlled internal porosity in thermoplastics is demonstrated.
Immersion precipitation three-dimensional printing (ip3DP) and freeform polymer (FPP) are unique versatile methods of 3D to fabricate structures based on nonsolvent-induced phase separation via direct ink writing (DIW). involves complex dynamics among solvents, nonsolvents, dissolved polymers, the printability models in these requires further understanding. To this end, we characterized two using polylactide (PLA) dichloromethane (7.5-30% w/w) as model inks. We analyzed rheological...
Abstract Scanning of a high-power laser beam on the surface martensitic stainless steel (SS420) has been studied, addressing effect scanning rate V integrity modifications in near-surface regions. Structural, compositional, and crystallographic characterizations revealed presence ablations, melting/resolidification, oxidations, austenite ( γ -phase) precipitations when ≤ 20 mm s −1 . Melt pool (MP), heat affected zone (HAZ), base material have clearly distinguished at cross-section...
Polysiloxane is a desirable material for the fabrication of devices in microfluidics, lab-on-a-chip, and microelectromechanical systems, but direct patterning microstructures using liquid polysiloxane resins would require adequate rheological chemical properties resins. In this work, we developed simple method to fabricate planar consisting commercially available without changing their properties. We used ink writing (DIW) printer dispense curable (with viscosity range 1–100 Pa·s) immiscible...
The deformation of a thin elastic capsule subjected to uniform electric field is investigated in the Stokes flow regime. electrohydrodynamic analyzed using perfect conductor and dielectric model for fluid phase, respectively. A theoretical analysis carried out an asymptotic expansion capillary number (Ca) (a ratio stress tension) small limit finite Hooke’s law. used determine elasticity polysiloxane capsules suspended oil, which obtained videography. boundary element method implemented seek...
Emulsification using electric fields is an easy alternative to flow-induced drop breakup, and the former reported be more effective economical than latter, especially when medium phase poorly conducting highly viscous. The emulsification of a coarse water-in-oil emulsion in uniform field studied. We perform detailed experimental analysis effect applied strength duration on size distribution. average diameter as well time for decreases with increase intensity field. Moreover, narrow...
Embedded 3D printing has demonstrated fabricating freeform structures of curable polymer resins in microparticulate hydrogels. This method is, however, not compatible with thermoplastics extruded at high temperature. communication presents a unique approach to 3D-print embedding media, termed precipitation (FPP). FPP is based on spatially controlled immersion inks patterned gels for various additives. The media offer dual functions: Bingham plastic maintain printed and nonsolvent situ inks....
Flexible core-shell 3D structures are essential for the development of soft sensors and actuators. Despite recent advancements in printing, fabrication flexible objects with internal architectures (such as channels void spaces) remains challenging liquid precursors due to difficulty maintain printed structures. The such is prominent especially when low-viscosity polysiloxane resins used. This study presents a unique approach applying direct ink writing (DIW) printing three-phase system...
Al0.85Sc0.15N thin films, about 920 nm thick, have been deposited on the Si (001) substrate by reactive magnetron sputtering at 600 °C. X-ray diffraction and pole-figure measurements revealed [0002]-oriented texture structures of nitride films without any phase separations before after cyclic annealing 600–900 °C for up to 48 min. Cross-sectional studies transmission electron microscopy energy dispersive x-ray analysis an intermediate layer ∼24.6 thick with smaller grains tilted...
We present an extracellular matrix (ECM)-based gradient generator that provides a culture surface with continuous chemical concentration gradients created by interstitial flow. The gelatin-based microchannels harboring generators and in-channel micromixers were rapidly fabricated sacrificial molding of 3D-printed water-soluble mold. When fluorescent dye solutions introduced into the channel, enhanced mixing two joined at junction. Moreover, generated in channel diffused to device through...