Sashikumar Ramamirtham

Sashikumar Ramamirtham
University of Edinburgh | UoE · Edinburgh Complex Fluids Partnership

Doctor of Philosophy
Working with industrial partners to solve research challenges in circular economy and sustainability.

About

9
Publications
2,070
Reads
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36
Citations
Introduction
Soft matter physicist with 7+ years of experience with expertise in rheology of biomolecules. Areas of interest revolves around physical understanding of interfacial and biomolecular systems.
Additional affiliations
October 2021 - present
Massey University
Position
  • Postdoc
Description
  • Synthesis and application of protein nanoparticles for improved emulsification
August 2014 - September 2017
Indian Institute of Technology Madras
Position
  • Research Scientist
Description
  • Project in Collaboration with Unilever: 1. Established the crystallization kinetics-structure-mechanical property correlation of triglyceride fats applied in sun screen formulations 2. Studied particle aggregation behavior and designed novel Pickering emulsions
October 2017 - October 2021
Massey University
Position
  • Doctoral student
Description
  • Project in collaboration with AgResearch: 1. Established fundamental structure - rheology relationship of protein ( beta-lactoglobulin) interfacial assemblies 2. Uncovered the role of polysaccharide (pectin) structural motifs on the interfacial behavior of protein/polysaccharide complexes
Education
October 2017 - October 2021
Massey University
Field of study
  • Bio-Physics
September 2010 - May 2012
University of Pennsylvania
Field of study
  • Chemical and Biomolecular Engineering
May 2006 - May 2010
Sastra University
Field of study
  • Chemical Engineering

Publications

Publications (9)
Article
Full-text available
This communication presents a comprehensive investigation into the impact of mixing on the synthesis of water-in-water Pickering emulsions. The approach employs commercial-grade oppositely charged nanoparticles within two distinct fluid phases, facilitating self-assembly and the formation of aggregates with variable sizes and compositions. Enhanced...
Article
We exploit the aggregation between oppositely charged particles to visualize and quantify the equilibrium position of charged colloidal particles at the fluid−water interface. A dispersion of commercially available charge-stabilized nanoparticles was used as the aqueous phase to create oil−water and air−water interfaces. The colloidal particles who...
Thesis
Full-text available
The complexation of proteins with polysaccharides to form bio-complexes is being utilized in a variety of applications including food formulations, microencapsulation, protein separation and bioactive deliveries. Understanding the impact of these biomolecules on each other with discernment will not only improve our existing usages but also aid in d...
Article
Full-text available
Electrostatic complexation of negatively charged polysaccharides with β-lactoglobulin (β-lg) has been shown to bolster the protein films at oil/water interfaces thereby improving emulsion stability. However, recent sub-phase exchange experiments demonstrated that highly charged polysaccharides such as low methyl-esterified pectin are complementary...
Article
Structural manipulation of β-lactoglobulin through processes such as heat treatment and complexation with other molecules has proven fruitful in industrial formulations. To fully appreciate the ramifications of such methods on protein interfacial adsorption we have investigated assemblies of β-lactoglobulin at oil/water interfaces predominantly at...
Article
Sol–gel processing is an important colloidal processing route for the synthesis of macroporous materials of tunable microstructure. More recently, methods that use particle stabilized foams or emulsions have been developed. However, such methods generally involve the use of an external surface active additives that bind the particles together durin...
Article
Full-text available
The rheological behavior such as yielding of fat crystal networks are dictated by many variables. Among these variables, the shape of the constituent fat cluster is important yet relatively unexplored. In this work, we describe the rheological investigations of a fat-oil system which can be formulated to either contain bundles of needles or spheric...
Article
Full-text available
The mechanical properties of fat–oil mixtures are dictated by the morphology of the fat crystal network, which in turn is strongly affected by the processing conditions. In this work the effect of uniform (linear) cooling rates on the size and shape of tribehenin (fat) clusters in isopropyl myristate (oil) was studied. The state of the fat–oil mixt...
Thesis
Full-text available
In this thesis, electrostatic phase separation of polymer mixtures at liquid/liquid interfaces to impart anisotropy is explored. This was carried out by fluorescently tagging one of the polymer component to monitor phase separation at DMSO/cyclohexane interfaces. It was observed that the phase separation led to polymer-rich domains of each componen...

Questions

Questions (3)
Question
I need to perform XRD analysis on fat crystals (triglycerides) and distinguish various form of crystals like alpha, beta & beta-dash. How to identify different polymorphs using the XRD results? Any literature suggested will be of great help. Thank you.
Question
I have been doing rheological studies on oil-wax mixtures. During rheological experiments I try to crystallize the wax between the geometries. I have observed that there is always an oil layer on top of the sample and the crystallization does not go to completion no matter how much time I give or how low the temperature is. I have tried different geometries like glass but the problem still persists. Can anybody enlighten me with what actually is going on? Also, please suggest some literature on the mechanism of oil entrapment between wax crystals. Thank you.
Question
I'm a chemical engineer so pardon me if my question is silly. I want to specifically de-convolute an ellipse-like closed loop function into a circle and a straight line. Is it possible using any software? Thanks.

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