Sreemannarayana Mypati

• PhD
• PhD Student at Queen's University

Cathode materials based on carbon substrates are of high interest for the electrochemical generation of hydrogen peroxide (H2O2) for wastewater treatment because of their low cost, chemical stability and high selectivity. However, the H2O2 selectivity of carbon materials can be significantly reduced in presence of surfactants, which are frequent co...

Cathode materials based on carbon substrates are of high interest for the electrochemical generation of hydrogen peroxide (H 2 O 2 ) for wastewater treatment because of their low cost, chemical stability and high selectivity. However, the H 2 O 2 selectivity of carbon materials can be significantly reduced in presence of surfactants, which are freq...

The exfoliation of graphene nanoplatelets (GNP) in aqueous media is challenging due to their restacking tendency. The sheets need to overcome the van der Waals attractive forces as well as the π−π interactions to form stable dispersions. The use of surfactants can resolve this issue but compromises the properties of GNP and therefore requires addit...

Rechargeable zinc–copper batteries attract considerable interest due to their relatively-high theoretical energy density, low cost, and inherent safety. However, their practical applications are restricted by different factors, such as the need of a separator preventing copper ion crossover or zinc dendrite growth. In this work, a novel rechargeabl...

The preparation of aqueous graphene nanoplatelet (GNP) dispersions is a challenging task due to their tendency to agglomerate. In contrast, graphene oxide (GO), an oxidized form of GNP, has amphiphilic characteristics which allow it to disperse in an aqueous milieu without the addition of a surfactant. Therefore, we utilize GO as a dispersing agent...

In this work, we formulate highly-concentrated aqueous graphene oxide/ graphene nanoplatelet (GO/GNP) dispersions. The stability of these dispersions mainly depends on the pH and the concentrations of the dispersed phase. The graphene hydrogels that we prepare from GNP, containing a small fraction of GO, are characterized by electrical conductivity...

Graphene is an excellent material because of its high electrical conductivity, high surface area, and superior mechanical properties. Stable dispersions of graphene nanoplatelets (GNPs) can be only achieved in organic solvents while in polar solvents the GNPs tend to agglomerate. Therefore, covalent and non-covalent functionalization of the GNP, or...

Strong long-term international partnership in science, technology, finance and policy is critical for sustainable field experiments leading to successful commercial deployment of novel technology at community-scale. Although technologies already exist that can remediate arsenic in groundwater, most are too expensive or too complicated to operate on...

Nowadays, a wide range of industrial manufacturing processes require high precision for product manufacturing. Micro dispensing is concerned with jetting of liquids through nozzles with a typical diameter on the order of magnitude of 100 microns. In this work, various aspects of micro dispensing of a Newtonian liquid are studied, including jet brea...

We study the influence of inkjet printing scheme and sintering parameter on the electrical resistivity of multi-layer silver nanoparticle films. A central composite Design Of Experiments (DOE) is employed to maximize experimental efficiency and improve the statistical significance of parameter estimates. The resulting mathematical correlations allo...

This study aimed at evaluating the influence of clay properties on the performance of microbial fuel cell made using ceramic separators. Performance of two clayware microbial fuel cells (CMFCs) made from red soil (CMFC-1) typically rich in aluminum and silica and black soil (CMFC-2) with calcium, iron and magnesium predominant was evaluated. These...