ORCID Profile
0000-0003-2730-6483
Current Organisations
National Oceanography Centre
,
University of Southampton
,
Qatar University College of Engineering
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Publications
Progress of Advanced Nanomaterials in the Non-Enzymatic Electrochemical Sensing of Glucose and H2O2
Publisher: MDPI AG
Date: 22-10-2020
DOI: 10.3390/BIOS10110151
Abstract: Non-enzymatic sensing has been in the research limelight, and most sensors based on nanomaterials are designed to detect single analytes. The simultaneous detection of analytes that together exist in biological organisms necessitates the development of effective and efficient non-enzymatic electrodes in sensing. In this regard, the development of sensing elements for detecting glucose and hydrogen peroxide (H2O2) is significant. Non-enzymatic sensing is more economical and has a longer lifetime than enzymatic electrochemical sensing, but it has several drawbacks, such as high working potential, slow electrode kinetics, poisoning from intermediate species and weak sensing parameters. We comprehensively review the recent developments in non-enzymatic glucose and H2O2 (NEGH) sensing by focusing mainly on the sensing performance, electro catalytic mechanism, morphology and design of electrode materials. Various types of nanomaterials with metal/metal oxides and hybrid metallic nanocomposites are discussed. A comparison of glucose and H2O2 sensing parameters using the same electrode materials is outlined to predict the efficient sensing performance of advanced nanomaterials. Recent innovative approaches to improve the NEGH sensitivity, selectivity and stability in real-time applications are critically discussed, which have not been sufficiently addressed in the previous reviews. Finally, the challenges, future trends, and prospects associated with advanced nanomaterials for NEGH sensing are considered. We believe this article will help to understand the selection of advanced materials for dual/multi non-enzymatic sensing issues and will also be beneficial for researchers to make breakthrough progress in the area of non-enzymatic sensing of dual/multi biomolecules.
Electronic Applications of Polydimethylsiloxane and Its Composites
Publisher: Springer International Publishing
Date: 17-10-2015
Graphene-Based Polymer Nanocomposites in Electronics
Publisher: Springer International Publishing
Date: 2015
Graphene oxide reinforced poly (4-styrenesulfonic acid)/polyvinyl alcohol blend composites with enhanced dielectric properties for portable and flexible electronics
Publisher: Elsevier BV
Date: 2017
Eco-Friendly Electromagnetic Interference Shielding Materials from Flexible Reduced Graphene Oxide Filled Polycaprolactone/Polyaniline Nanocomposites
Publisher: Informa UK Limited
Date: 12-06-2016
Effect of nanostructured polyhedral oligomeric silsesquioxane on the physical properties of poly(vinyl alcohol)
Publisher: Wiley
Date: 08-07-2017
DOI: 10.1002/APP.45447
Flexible NO2 sensors from renewable cellulose nanocrystals/iron oxide composites
Publisher: Elsevier BV
Date: 10-2016
Graphene/Polymer Nanocomposites: Role in Electronics
Publisher: Springer International Publishing
Date: 2015
Cellulose/PDMS hybrid material for actuating lens
Publisher: SPIE
Date: 03-04-2015
DOI: 10.1117/12.2084491
Microton irradiation induced tuning of dielectric properties of nano ZnO–natural rubber disks
Publisher: Springer Science and Business Media LLC
Date: 27-03-2017
Influence of temperature on the confinement effects of micro and nano level graphite filled poly(isoprene-co-isobutylene) composites
Publisher: Springer Science and Business Media LLC
Date: 02-06-2016
Oleic acid-grafted chitosan/graphene oxide composite coating for corrosion protection of carbon steel
Publisher: Elsevier BV
Date: 10-2016
DOI: 10.1016/J.CARBPOL.2016.06.001
Abstract: An anticorrosion coating film based on the formation of nanocomposite coating is reported in this study. The composite consisted of chitosan (green matrix), oleic acid, and graphene oxide (nano filler). The nanocomposite coating was arranged on the surface of carbon steel, and the corrosion resistance was monitored using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP). Compared to the pure chitosan (CS) coating, the corrosion resistance of oleic acid-modified chitosan/graphene oxide film (CS/GO-OA) is increased by 100 folds. Since the well-dispersed smart grafted nanolayers delayed the penetration rate of corrosive species and thus maintained long term anticorrosive stability which is correlated with hydrophobicity and permeability.
Investigation on the Electrical Properties of Lithium Ion Conducting Polymer Electrolyte Films Based on Biodegradable Polymer Blends
Publisher: American Scientific Publishers
Date: 08-2018
Abstract: In the present work, the polyvinyl alcohol oly (N-vinyl pyrrolidone)/Lithium carbonate (PVA/PVP/Li 2 CO 3 ) blend polymer electrolyte films were prepared via the solution casting technique, with varying concentration of Li 2 CO 3 salt (0 to 25 wt%). The surface morphology of these blend electrolyte films was examined using polarized optical microscopy (POM). The electrical properties such as impedance (Z), quality factor (Q-factor) and phase angle ( ) of PVA/PVP/Li 2 CO 3 blend electrolyte films were elucidated using impedance analyzer in the frequencies from 50 Hz to 20 MHz and temperatures from 30 °C to 150 °C. It was observed that the inclusion of Li 2 CO 3 salt into the PVA/PVP blend matrix led to an increase in the Z, and Q-factor values. The maximum Z of 1.19 x 10 7 Ω (50 Hz, 30 °C) was observed for blend electrolyte film containing 25 wt% Li 2 CO 3 salt. The also increased from 139° (20 MHz, 90 °C) for PVA/PVP blend to 179° (20 MHz, 40 °C) for blend electrolyte film containing 25 wt% Li 2 CO 3 salt. The Q-factor values was increased from 27.4 (10 MHz, 140 °C) for PVA/PVP blend to 56.2 (5 MHz,salt, 80 °C) for blend electrolyte film containing 25 wt% Li 2 CO 3 salt.
Flexible cellulose acetate/graphene blueprints for vibrotactile actuator
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA03043A
Abstract: Tactile devices containing many actuators within are being sutured using electroactive polymers.
Natural Polyisoprene Composites and Their Electronic Applications
Publisher: Springer International Publishing
Date: 17-10-2015
Tocilizumab in patients admitted to hospital with COVID-19 (RECOVERY): a randomised, controlled, open-label, platform trial
Publisher: Elsevier BV
Date: 05-2021
Silver Nanoparticles and Its Polymer Nanocomposites—Synthesis, Optimization, Biomedical Usage, and Its Various Applications
Publisher: Springer International Publishing
Date: 2019
Photocatalytic, antibacterial and electrochemical properties of novel rare earth metal oxides-based nanohybrids
Publisher: Elsevier BV
Date: 2020
Carbon nanotube based elastomer composites – an approach towards multifunctional materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TC01037J
Abstract: The current study focuses on giving a basic understanding of tubular graphene sheets or carbon nanotubes (CNTs) and points towards their role in fabricating elastomer composites.
Studies on the Electrical Properties of Graphene Oxide-Reinforced Poly (4-Styrene Sulfonic Acid) and Polyvinyl Alcohol Blend Composites
Publisher: World Scientific Pub Co Pte Lt
Date: 12-10-2017
DOI: 10.1142/S0219581X17600055
Abstract: In the present study, graphene oxide (GO)-reinforced poly (4-styrenesulfonic acid) (PSSA) olyvinyl alcohol (PVA) blend composite films were prepared using colloidal blending technique at various concentrations of GO (0–3[Formula: see text]wt.%). The morphological investigations of the prepared composites were carried out using polarized optical microscopy and scanning electron microscopy. The electrical properties of composites were evaluated using an impedance analyzer in the frequency range 50[Formula: see text]Hz to 20[Formula: see text]MHz and temperature in the range 40–150[Formula: see text]C. Morphological studies infer that GO was homogeneously dispersed in the PSSA/PVA blend matrix. Investigations of electrical property indicate that the incorporation of GO into PSSA/PVA blend matrix resulted in the enhancement of the impedance ([Formula: see text] and the quality factor ([Formula: see text]-factor) values. A maximum impedance of about 4.32[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text] was observed at 50[Formula: see text]Hz and 90[Formula: see text]C for PSSA/PVA/GO composites with 3[Formula: see text]wt.% GO loading. The [Formula: see text]-factor also increased from 8.37 for PSSA/PVA blend to 59.8 for PSSA/PVA/GO composites with 3[Formula: see text]wt.% GO loading. These results indicate that PSSA/PVA/GO composites can be used for high-[Formula: see text] capacitor applications.
Graphene oxide reinforced polyvinyl alcohol/polyethylene glycol blend composites as high-performance dielectric material
Publisher: Springer Science and Business Media LLC
Date: 20-07-2016
A Comparative Review of Natural and Synthetic Biopolymer Composite Scaffolds
Publisher: MDPI AG
Date: 30-03-2021
Abstract: Tissue engineering (TE) and regenerative medicine integrate information and technology from various fields to restore/replace tissues and damaged organs for medical treatments. To achieve this, scaffolds act as delivery vectors or as cellular systems for drugs and cells thereby, cellular material is able to colonize host cells sufficiently to meet up the requirements of regeneration and repair. This process is multi-stage and requires the development of various components to create the desired neo-tissue or organ. In several current TE strategies, biomaterials are essential components. While several polymers are established for their use as biomaterials, careful consideration of the cellular environment and interactions needed is required in selecting a polymer for a given application. Depending on this, scaffold materials can be of natural or synthetic origin, degradable or nondegradable. In this review, an overview of various natural and synthetic polymers and their possible composite scaffolds with their physicochemical properties including biocompatibility, biodegradability, morphology, mechanical strength, pore size, and porosity are discussed. The scaffolds fabrication techniques and a few commercially available biopolymers are also tabulated.
Nanostructured ZnO gas sensors obtained by green method and combustion technique
Publisher: Elsevier BV
Date: 2017
Designing dual phase sensing materials from polyaniline filled styrene–isoprene–styrene composites
Publisher: Elsevier BV
Date: 10-2014
Calcined hydrotalcites of varying Mg/Al ratios supported Rh catalysts: highly active mesoporous and stable catalysts toward catalytic partial oxidation of methane
Publisher: Springer Science and Business Media LLC
Date: 03-01-2021
Controlling the sensing performance of rGO filled PVDF nanocomposite with the addition of secondary nanofillers
Publisher: Elsevier BV
Date: 09-2018
Poly-carboxylic acids functionalized chitosan nanocarriers for controlled and targeted anti-cancer drug delivery
Publisher: Elsevier BV
Date: 10-2016
DOI: 10.1016/J.BIOPHA.2016.06.026
Abstract: The present study evaluates the in-vitro cisplatin (CDDP) release from four different poly oxalates cross-linked chitosan (CS) nanocomposites. The poly oxalates were synthesized from the reaction of four different dicarboxylic acids with ethylene glycol (EG). The encapsulation of CDDP on CS cross-linked with Oxalic acid-EG, Succinic acid-EG, Citric acid-EG and tartaric acid-EG carriers were carried out by the ionic gelation technique. The poly-oxalate nanocarriers were characterized by scanning electron microscopy, atomic force microscopy, X-ray diffraction studies and zeta potential analysis. The stability of poly-oxalates was calculated by the density functional theory (DFT) using Gaussview 05. Excellent drug release kinetics and good biocompatibility of nanocomposites were observed for the in-vitro analysis. The unloaded poly oxalate nanocomposites perform to have a low inherent cytotoxicity, whereas the loaded nanocomposites were as active as free CDDP in the MCF-7 cancer cell line. The tumor growth inhibitions of CDDP-loaded nanocomposites are more or equal to that of free CDDP. Taken together, these two poly oxalate nanocomposites are established as promising drug carriers for the delivery of CDDP.
Microtron Irradiation Induced Tuning of Band Gap and Photoresponse of Al-ZnO Thin Films Synthesized by mSILAR
Publisher: Springer Science and Business Media LLC
Date: 02-06-2016
Carbon dioxide adsorption based on porous materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0RA10902A
Abstract: Global warming is considered one of the world's leading challenges in the 21st century as it causes severe concerns such as climate change, extreme weather events, ocean warming, sea-level rise, declining Arctic sea ice, and acidification of oceans.
Studies on the Mechanical, Morphological and Electrical Properties of Highly Dispersible Graphene Oxide Reinforced Polypyrrole and Polyvinylalcohol Blend Composites
Publisher: Elsevier BV
Date: 2018
Electroactive and Optically Adaptive Bionanocomposite for Reconfigurable Microlens
Publisher: American Chemical Society (ACS)
Date: 17-05-2016
Abstract: This paper introduces an electroactive bionanocomposite based on poly(diethylene glycol adipate) (PDEGA) and cellulose nanocrystals (CNCs). The bionanocomposites were made using CNCs extracted from cotton and by optimizing its concentration in terms of the optical transmittance and viscosity. The characteristic properties of the materials were analyzed using contact angle measurements and Fourier transformation infrared spectra. Using the PDEGA/CNC bionanocomposite at a very low concentration of CNCs, a configurable lens having a robust, self-contained tunable optical structure was developed. The shape and curvature of the soft PDEGA/CNC device were controlled by applying voltage, and the focal length was measured. The simple structure, high optical transparency, biodegradability, thermal stability, high durability, and low power consumption make the new material particularly useful in fabricating a reconfigurable lens for future electronic and optical devices.
Reduced graphene oxide filled poly(dimethyl siloxane) based transparent stretchable, and touch-responsive sensors
Publisher: AIP Publishing
Date: 25-04-2016
DOI: 10.1063/1.4947595
Abstract: The ongoing revolution in touch panel technology and electronics demands the need for thin films, which are flexible, stretchable, conductive, and highly touch responsive. In this regard, conductive elastomer nanocomposites offer potential solutions for these stipulations however, viability is limited to the poor dispersion of conductive nanomaterials such as graphene into the matrix. Here, we fabricated a reduced graphene oxide (rGO) and poly(dimethylsiloxane) (PDMS) elastomer based transparent and flexible conductive touch responsive film by dispersing rGO honeycombs uniformly into PDMS elastomer through an ionic liquid (IL) modification. Pursuing a simple, scalable, and safe method of solution casting, this provides a versatile and creative design of a transparent and stretchable rGO/IL-PDMS capacitive touch responsive, where rGO acts as a sensing element. This transparent film with ∼70% transmittance exhibits approximately a five times faster response in comparison to rGO/PDMS film, with negligible degradation over time. The performance of this touch screen film is expected to have applications in the emerging field of foldable electronics.
Casirivimab and imdevimab in patients admitted to hospital with COVID-19 (RECOVERY): a randomised, controlled, open-label, platform trial
Publisher: Elsevier BV
Date: 02-2022
A Fast Responsive Ultraviolet Sensor from mSILAR-Processed Sn-ZnO
Publisher: Springer Science and Business Media LLC
Date: 20-07-2017
Continuous glucose monitoring reveals a novel association between duration and severity of hypoglycemia, and small nerve fiber injury in patients with diabetes
Publisher: Bioscientifica
Date: 12-2022
DOI: 10.1530/EC-22-0352
Abstract: Continuous glucose monitoring (CGM) has revealed that glycemic variability and low time in range are associated with albuminuria and retinopathy. We have investigated the relationship between glucose metrics derived from CGM and a highly sensitive measure of neuropathy using corneal confocal microscopy in participants with type 1 and type 2 diabetes. A total of 40 participants with diabetes and 28 healthy controls underwent quantification of corneal nerve fiber density (CNFD), corneal nerve branch density (CNBD), corneal nerve fiber length (CNFL) and inferior whorl length (IWL) and those with diabetes underwent CGM for four consecutive days. CNBD was significantly lower in patients with high glycemic variability (GV) compared to low GV (median (range) (25.0 (19.0–37.5) vs 38.6 (29.2–46.9) P = 0.007) in patients who spent % compared to % time in level 1 hypoglycemia (54-69 mg/dL) (25.0 (22.9–37.5) vs 37.5 (29.2–46.9) P = 0.045) and in patients who spent % compared to % time in level 2 hypoglycemia ( mg/dL) (25.0 (19.8–41.7) vs 35.4 (28.1–44.8) P = 0.04). Duration in level 1 hypoglycemia correlated with CNBD ( r = –0.342, P = 0.031). Duration in level 1 (181–250 mg/dL) and level 2 ( mg/dL) hyperglycemia did not correlate with CNFD ( P 0.05), CNBD ( P 0.05), CNFL ( P 0.05) or IWL ( P 0.05). Greater GV and duration in hypoglycemia, rather than hyperglycemia, are associated with nerve fiber loss in diabetes.
Surface functionalization of natural lignin isolated from Aloe barbadensis Miller biomass by atom transfer radical polymerization for enhanced anticancer efficacy
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA01866A
Abstract: Lignin (LIG), one of the major natural polymers in the biomass is widely used for various industrial and biomedical applications, mainly in its modified form of grafted lignin.
Effect of phosphorus on controlling and enhancing electrocatalytic performance of Ni–P–TiO2–MnO2 coatings
Publisher: Elsevier BV
Date: 10-2018
Azithromycin in patients admitted to hospital with COVID-19 (RECOVERY): a randomised, controlled, open-label, platform trial
Publisher: Elsevier BV
Date: 02-2021
Calcium deficiency in hydroxyapatite and its drug delivery applications
Publisher: Institution of Engineering and Technology (IET)
Date: 04-2018
FLEXIBLE OIL SENSORS BASED ON MULTIWALLED CARBON NANOTUBE–FILLED ISOPRENE ELASTOMER COMPOSITES
Publisher: Rubber Division, ACS
Date: 06-2016
DOI: 10.5254/RCT.15.84841
Abstract: Oil spills due to either accidents or deliberate oily discharges cause severe pollution and can be thwarted if proper detection facilities are applied. This article reports new flexible oil sensor capabilities of three different elastomer (natural rubber, butyl rubber, and styrene–isoprene–styrene copolymer) composites of multiwalled carbon nanotubes (MWCNTs). We highlight the sensor manufacturing by simple means of solution mixing, and the uniform dispersion of MWCNTs in the elastomers is substantiated with the help of morphology and structural analyses. Electrical percolation and semiconductor characteristics were also examined for composites. The developed materials show better oil sensing above the percolation level, and the filler–polymer interfacial interaction is the main factor regulating the oil-detecting capability. The efficiency of the sensors was also tested after many instances of bending.
Surface modification and grafting of carbon fibers: A route to better interface
Publisher: Elsevier BV
Date: 09-2018
Evolution from graphite to graphene elastomer composites
Publisher: Elsevier BV
Date: 04-2014
Methanol Electrolysis for Hydrogen Production Using Polymer Electrolyte Membrane: A Mini-Review
Publisher: MDPI AG
Date: 11-11-2020
DOI: 10.3390/EN13225879
Abstract: Hydrogen (H2) has attained significant benefits as an energy carrier due to its gross calorific value (GCV) and inherently clean operation. Thus, hydrogen as a fuel can lead to global sustainability. Conventional H2 production is predominantly through fossil fuels, and electrolysis is now identified to be most promising for H2 generation. This review describes the recent state of the art and challenges on ultra-pure H2 production through methanol electrolysis that incorporate polymer electrolyte membrane (PEM). It also discusses about the methanol electrochemical reforming catalysts as well as the impact of this process via PEM. The efficiency of H2 production depends on the different components of the PEM fuel cells, which are bipolar plates, current collector, and membrane electrode assembly. The efficiency also changes with the nature and type of the fuel, fuel/oxygen ratio, pressure, temperature, humidity, cell potential, and interfacial electronic level interaction between the redox levels of electrolyte and band gap edges of the semiconductor membranes. Diverse operating conditions such as concentration of methanol, cell temperature, catalyst loading, membrane thickness, and cell voltage that affect the performance are critically addressed. Comparison of various methanol electrolyzer systems are performed to validate the significance of methanol economy to match the future sustainable energy demands.
Dielectric Spectroscopy
Publisher: Elsevier
Date: 2017
Nanostructured metal oxides and its hybrids for photocatalytic and biomedical applications
Publisher: Elsevier BV
Date: 07-2020
Interrelated shape memory and Payne effect in polyurethane/graphene oxide nanocomposites
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA41395K
Superhydrophobic Al2O3–Polymer Composite Coating for Self-Cleaning Applications
Publisher: MDPI AG
Date: 27-09-2021
Abstract: Superhydrophobic coatings have a huge impact in various applications due to their extreme water-repellent properties. The main novelty of the current research work lies in the development of cheap, stable, superhydrophobic and self-cleaning coatings with extreme water-repellency. In this work, a composite of hydrothermally synthesized alumina (Al2O3), polymethylhydrosiloxane (PMHS) and polystyrene (PS) was deposited on a glass surface by a dip-coating technique. The Al2O3 nanoparticles form a rough structure, and low-surface-energy PHMS enhances the water-repellent properties. The composite coating revealed a water contact angle (WCA) of 171 ± 2° and a sliding angle (SA) of 3°. In the chemical analysis, Al2p, Si2p, O1s, and C1s elements were detected in the XPS survey. The prepared coating showed a self-cleaning property through the rolling action of water drops. Such a type of coating could have various industrial applications in the future.
Related Organisations
European Space Agency
Location: United Kingdom of Great Britain and Northern Ireland
National Oceanography Centre
Location: United Kingdom of Great Britain and Northern Ireland
University Of Southampton
Location: United Kingdom of Great Britain and Northern Ireland
The University Of Edinburgh
Location: United Kingdom of Great Britain and Northern Ireland
University Of Exeter College Of Life And Environmental Sciences
Location: United Kingdom of Great Britain and Northern Ireland
Related Funding Activities
No related grants have been discovered for Kishor Kumar Sadasivuni.