Amit Kumar

University of Limerick | UL · Department of Chemical and Environmental Science

Green synthesis of gold nanoparticles (AuNPs) facilitated by the use of an aqueous petal extract of the medicinal plant Combretum indicum (Madhumalti) as a bio-reducing agent has been performed in this work. In the absence of ammonia, the average diameter of synthesised gold nanoparticles ranged from 41nm to 79.40 nm whereas the range is 11.856 nm...

Cinnamate-based polyesters were synthesized, including poly(4-hydroxycinnamic acid), poly(4-hydroxy-3-me-thoxycinnamic acid), poly(3-hydroxycinnamic acid) (P3HCA), and hyperbranched poly(3,4-dihydroxycinnamic acid) (PdHCA). These materials were further processed into hard and dry membranes by casting and underwent photoreactions by ultraviolet (UV)...

An aspartame-based AB-type diketopiperazine monomer, cyclo(L-aspartyl-4-amino-L-phenylalanyl) (ADKP), was synthesized and subsequently utilized in the polycondensation of homo-polyamides with high molecular weights. By using various amino acids, dicarboxylic acids, and diamines, random DKP-based copolymers were also synthesized. The self-assembly p...

4-Aminophenylalanine (4APhe), an exotic amino acid which is obtained as a microorganism metabolite of glucose, is polycondensed with various tetracarboxylic dianhydrides as a diamine monomer to obtain poly(amic acid)s. Subsequent thermal imidization of poly(amic acid)s is made at 220 °C with stepwise heating from 100 °C. Some of the obtained polyim...

Self-assembling polyimides (PIs) having diketopiperazine (DKP) components were synthesized by polycondensation of a 4-amino-l-phenylalanine (4APhe) dimer, an aromatic diamine newly designed in this study. The amino acid-derived PIs showed high thermal resistance, with a 10% weight loss temperature (Td10) of 432 °C at the maximum, and did not show a...

The current review focuses on the comprehensive studies of platinum-based complexes that are known to exhibit anticancer properties. The capacity to perceive, to comprehend at the sub-atomic level, and to treat sicknesses has brought sufficient metal-particle work which constitutes an imperative part of therapeutic bioinorganic science. Understandi...

One of the most important applications of sol–gel processing is in the preparation of thin films. Thin‐film formation is possible due to deposition of alkoxide followed by exposure to moisture. There are various methods for thin‐film coating or deposition using sol–gel technique. However, the basic steps are almost similar, which include exhausting...

Novel titanium and vanadium based trimetallic oxide nanocomposites (TMONCs) have been synthesized using metal salts of titanium-vanadium along with three others metals viz. tin, aluminium and zinc as precursors by the sol-gel method. Aqueous ammonia and hydrazine hydrate were used as the reducing agents. The preparations of nanocomposites were moni...

Cancer treatment using platinum has vastly been associated with numerous side effects and resistance generation. As a result, current medicinal chemistry is now emphasized on the development of novel metal based drugs bearing diverse pharmacological profile. There has been an increasing interest in the drafting of Au(III) complexes as new metal bas...

Sustainable application involves three basic components: (a) low energy consumption, (b) low carbon footprint, and (c) lesser use of natural resources during its life cycle. Human activities in recent times have been a matter of grave concern due to the consumption of natural resources at an exponential rate for energy generation leading to various...

Human activities in past decades have raised serious issues related to the environment and its conservation. Air pollution, poor management of waste, growing water scarcity, falling groundwater tables, water pollution, preservation and quality of forests, biodiversity loss, and land/soil degradation, global climate change, pollution, environmental...

Sustainable application involves three basic components: (a) low energy consumption, (b) low carbon footprint, and (c) lesser use of natural resources during its life cycle. Human activities in recent times have been a matter of grave concern due to the consumption of natural resources at an exponential rate for energy generation leading to various...

Nanosized titania has promising application in the field of photocatalysis, optical coating and solar cell. Metal alkoxides based sol–gel methodology is one of the established & extensively used route for the preparation of nano-titania. In present work, nanosized titania have been prepared through sol–gel transformation of synthesised and chemical...

Thin film coatings are a much explored domain, since films are well suited for the studies of physical, particularly optical properties and have numerous scientific, technological, and commercial applications. number of techniques have been used which involves different types of precursors. This review will highlight coating technology utilizing th...

For the first time, any type of plant extract from the medicinally important plant Combretum indicum has been used for the biosynthesis of silver nanoparticles (AgNPs).The present investigation reports the synthesis and characterization of AgNPs using the flower petal extract of Combretum indicum. For monitoring the formation and optical properties...

A group of organotin(IV) complexes with thiohydrazones derived from phenethylamine were synthesised in 1:1 complexes. The following organotin(IV) complexes have been synthesized: (C6H5CH2)2Sn(L1)Cl2, (p-ClC6H4CH2)2 Sn(L2)Cl2, (C6H5CH2)2Sn(L2)Cl2, (C6H5CH2)2Sn(L3)Cl2, (p-ClC6H4CH2)2Sn(L3)Cl2, (C6H5CH2)2Sn(L4)Cl2, (C6H5CH2)3 Sn(L5)Cl, where L1 = benz...

Structural investigation of polymers by various available analytical methods is important in order to correlate the structure with polymer properties for which understanding of polymer structure is very important factor. The data presented here in this article shows the 1H NMR spectra used for the characterization of prepared poly(amic acid)s (PAAs...

A nanocomposite of 0.5SnO2-0.5Al2O3 has been synthesized using a sol-gel route. Structural and optical properties of the nanocomposite have been discussed in detail. Powder X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray diffraction spectroscopy confirm the phase purity and the particle size of the 0.5SnO2-0.5Al2O3 n...

Nanomixed SnO2–Al2O3 with variable composition has been synthesized by sol–gel technique using aluminium dichloride and stannous chloride as precursors. Synthesized nanocomposites have been characterized using various techniques such as X-ray diffraction (XRD), Fourier transform infrared, scanning electron microscopy and Energy-dispersive X-ray spe...

Sol gel technique has come across as a convenient route to synthesize nanoparticles using various precursors. Starting from the earlier work on the silica material and now covering precursor like metal-oxides and organic-inorganic hybrids, this method has proved to be flexible, economical and less complex as compared to conventional routes for nano...

We have developed a novel route for the synthesis of high-performance bio-polyimides (PIs) microbially-derived from photo-responsive aromatic diamine 4,4′-diaminostilbene (DAS) and its reduced counterpart 4, 4′-(ethane-1,2-diyl)dianiline (EDDA). DAS and EDDA were condensed with various commercially-available dianhydrides to obtain a series of poly(...

A new series of cadmium(II) complexes with biological active ligands such as niacinamide (L1), isoniazid (L2), purine bases: theophylline (HL3) and theobromine (L4), isoniazid derivatives: isoniazid dithiocarbazate (HL5), S-methyl ester of Isoniazid dithiocarbazate (L6) and S-ethyl ester of Isoniazid dithiocarbazate (L7), of the type Cd(L)2I2 or Cd...

Multi-walled carbon nanotubes (MWCNTs) were well dispersed in an aqueous solution of the cyanobacterial polysaccharide, sacran, with an ultra-high molecular weight >10 million g/mol. MWCNTs powder was put into aqueous solutions of various polysaccharides including sacran and was dispersed under sonication. As a result of the turbidity measurement o...