Ranganathan Kumar
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View article: Laser-Induced Liquid-Phase Boron Doping of 4H-SiC
Laser-Induced Liquid-Phase Boron Doping of 4H-SiC Open
4H-silicon carbide (4H-SiC) is a cornerstone for next-generation optoelectronic and power devices owing to its unparalleled thermal, electrical, and optical properties. However, its chemical inertness and low dopant diffusivity for most do…
View article: Laser‐Sintered Silver Metallization for Silicon Heterojunction Photovoltaic Cells
Laser‐Sintered Silver Metallization for Silicon Heterojunction Photovoltaic Cells Open
Herein, a novel metallization technique is reported for crystalline silicon heterojunction (SHJ) solar cells in which silver (Ag) fingers are printed on the SHJ substrates by dispensing Ag nanoparticle‐based inks through a needle and then …
View article: Numerical investigation of laser doping parameters for semi-insulating 4H-SiC substrate
Numerical investigation of laser doping parameters for semi-insulating 4H-SiC substrate Open
Semi-insulating (SI) 4H-polytype of silicon carbide (SiC) is a highly desirable wide bandgap semiconductor material for various applications in challenging environments owing to its exceptional characteristics such as high melting point, r…
View article: The interaction of a droplet with an immiscible deep liquid pool for density ratio greater than unity
The interaction of a droplet with an immiscible deep liquid pool for density ratio greater than unity Open
Droplet interaction with liquid pools has been widely studied. The focus of these studies has primarily been on like-fluids, the droplet being miscible with the pool. Such miscible droplet–pool interactions have been extensively studied fo…
View article: Diffraction and thermal effect of a Bessel-Gaussian laser for Ag nanoparticle deposition
Diffraction and thermal effect of a Bessel-Gaussian laser for Ag nanoparticle deposition Open
Nanoparticles are known to sinter at much lower temperatures than the corresponding bulk or micro size particles. A laser-assisted sintering process is considered in this study to sinter Ag nanoparticles by dispensing Ag paste onto an indi…
View article: Process–Structure–Properties Relationships of Passivating, Electron‐Selective Contacts Formed by Atmospheric Pressure Chemical Vapor Deposition of Phosphorus‐Doped Polysilicon
Process–Structure–Properties Relationships of Passivating, Electron‐Selective Contacts Formed by Atmospheric Pressure Chemical Vapor Deposition of Phosphorus‐Doped Polysilicon Open
Herein, we investigate the process–structure–properties relationships of in situ phosphorus (P)‐doped polycrystalline silicon (poly‐Si) films by atmospheric pressure chemical vapor deposition (APCVD) for fabricating poly‐Si passivating, el…
View article: Deformation of an Encapsulated Leukemia HL60 Cell through Sudden Contractions of a Microfluidic Channel
Deformation of an Encapsulated Leukemia HL60 Cell through Sudden Contractions of a Microfluidic Channel Open
Migration of an encapsulated leukemia HL60 cell through sudden contractions in a capillary tube is investigated. An HL60 cell is initially encapsulated in a viscoelastic shell fluid. As the cell-laden droplet moves through the sudden contr…
View article: Improving viability of leukemia cells by tailoring shell fluid rheology in constricted microcapillary
Improving viability of leukemia cells by tailoring shell fluid rheology in constricted microcapillary Open
Encapsulated cell therapy has shown great potential in the treatment of several forms of cancer. Microencapsulation of these cancer cells can protect the core from the harmful effects of the neighboring cellular environment and can supply …
View article: Non-dimensional groups for electrospray modes of highly conductive and viscous nanoparticle suspensions
Non-dimensional groups for electrospray modes of highly conductive and viscous nanoparticle suspensions Open
Multiple modes of atomization in electrosprays are affected by viscosity, surface tension and electrical conductivity of the semiconductor nanosuspensions. While the effect of gravity is dominant in the dripping mode, the electric field de…
View article: Geometry Effects of Axisymmetric Flow-Focusing Microchannels for Single Cell Encapsulation
Geometry Effects of Axisymmetric Flow-Focusing Microchannels for Single Cell Encapsulation Open
Cell microencapsulation is a promising technique to protect living cells in biomedical applications. Microfluidic devices can be utilized to control the production of high-throughput cell-laden droplets. This paper demonstrates the effects…
View article: Laser-induced subwavelength structures by microdroplet superlens
Laser-induced subwavelength structures by microdroplet superlens Open
Nanoscale patterns on rigid or flexible substrates are of considerable interest in modern nanophotonics and optoelectronics devices. Subwavelength structures are produced in this study by using a laser beam and microdroplets that carry nan…
View article: Optimization of Machining Parameters of Milling Operation by Application of Semi-synthetic oil based Nano cutting Fluids
Optimization of Machining Parameters of Milling Operation by Application of Semi-synthetic oil based Nano cutting Fluids Open
The present study is concerned with resolving the problems pertaining to the conventional cutting fluids. Two samples of nano cutting fluids were prepared by dispersing 0.01 vol% of MWCNTs and a mixture of 0.01 vol% of MWCNTs and 0.01 vol%…
View article: Thermocapillarity in Microfluidics—A Review
Thermocapillarity in Microfluidics—A Review Open
This paper reviews the past and recent studies on thermocapillarity in relation to microfluidics. The role of thermocapillarity as the change of surface tension due to temperature gradient in developing Marangoni flow in liquid films and c…
View article: Thermally induced collision of droplets in an immiscible outer fluid
Thermally induced collision of droplets in an immiscible outer fluid Open
Micro-total analysis systems (μTAS) have attracted wide attention and are identified as a promising solution for sample transport, filtration, chemical reactions, separation and detection. Despite their popularity, the selection of an appr…