St Alberts College

Cochin, India

St Alberts College

Cochin, India
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Varkey J.T.,St Teresas College | Ajil P.A.,St Alberts College | Antony A.,St Alberts College
Asian Journal of Chemistry | Year: 2017

Copper nanoparticles perform a key role in catalysis, antimicrobial fields and electronics. Copper nanoparticles were synthesized by various methods and their efficiencies were compared. Green Chemical approach which used citrus lemon fruit extract both as the reduction and capping agent is found to be most efficient and economical method for the synthesis of copper nanoparticles.

Sajeesh T.H.,St Alberts College | Deepa K.G.,Indian Institute of Science | Vijayakumar K.P.,Cochin University of Science and Technology
AIP Conference Proceedings | Year: 2017

SnS thin films were prepared using chemical spray pyrolysis (CSP) technique. p-type SnS films with direct band gap of 1.33 eV and having very high absorption coefficient were obtained with the optimized deposition conditions. In this paper we focus on investigating the uniformity and phase purity of the hence deposited SnS films employing Raman and X-ray Photoelectron Spectroscopy (XPS) analysis. Raman Spectra of the films had only single peak corresponding to the Raman active Ag mode at 224 cm-1 which is characteristic for phase-pure SnS thin films. Detailed XPS analysis on these samples were performed by scanning the peaks for Sn, S, and O with high resolution to estimate the chemical states and composition. Employing Ar-ion sputtering, the depth profiles showing variation in concentration and binding energies of S, Sn, O over the sample thickness were obtained and the uniformity in composition along the thickness has been discussed in detail. © 2017 Author(s).

Joseph G.,St Alberts College | Joshy C.G.,Central Institute of Fisheries Education | Bindu J.,Central Institute of Fisheries Education | Kamalakanth C.K.,Central Institute of Fisheries Education
High Pressure Research | Year: 2017

The effect of pressure (150, 250 and 350 MPa), ramp rate (200, 400 and 600 MPa/min) and holding time (3, 6 and 9 min) on the quality indices (dependent variable) of Indian white prawn (Fenneropenaeus indicus) was optimized using response surface methodology. Box–Behnken response surface design was used with 15 runs. Second-order response surface model was fitted to the experimental data and the model adequacy was measured by R2 value. The linear and quadratic effect of pressure, ramp rate and holding time was significant for tri-methylamine, total volatile base nitrogen and total plate count. Based on the ridge analysis and response surface plots, the optimum combination obtained was 250 MPa pressure, 400 MPa/min ramp rate and 6 min holding time for high pressure (HP) processing of Indian white prawn. Validation of the experiment indicated that the developed model was appropriate to predict quality indices in Indian white prawn processed by HP processing. © 2017 Informa UK Limited, trading as Taylor & Francis Group

Shashidharan A.,St Alberts College | Plomindas S.N.,Fatima Mata National College
International Journal on Algae | Year: 2017

A collection of some of the marine macroalgal species from the Kollam Coast of India belonging to three major groups (Chlorophyceaea, Phaeophyceaea, and Rhodophyceaea) levels of moisture, total carbohydrates, total proteins and few antioxidant components, namely, ascorbic acid, β-carotene and catalase enzyme, were analyzed. Standard procedures were followed for carrying out estimations and assays. Moisture levels were highest in the green alga Caulerpa scalpelliformis, while protein concentration was astonishingly high in the Phaeophycean member Padina tetrastromatica. Carbohydrate levels were highest in brown algal members. Ascorbic acid concentration was almost similar in the studied species. The β-carotene values were highest in C. scalpelliformis and lowest in the other green alga, Ulva lactuca. Catalase activity was found prominent in Sargassum tenerrimum. The results obtained in the present work reveal the basic biochemical components of five seaweeds from the Kollam Coast in India. Interestingly, P. tetrastromatica showed surplus levels of protein when compared to the normal trend for brown algae. Ascorbic acid, an antioxidant, was found at similar levels in the studied species and almost at par with some common fruits. Thus, the studied seaweeds could definitely be considered as a source of vitamin C and other nutrients on the basis of further in-depth studies. © Begell House Inc., 2017.

Jacob S.,Cochin University of Science and Technology | Suma K.K.,Cochin University of Science and Technology | Suma K.K.,Maharajas college | Mendez J.M.,Cochin University of Science and Technology | And 2 more authors.
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2010

Polymer composites reinforced by both the micro and nano fillers is the subject of this paper. Polypropylene (PP)-nylon micro-fibre composites modified with nanosilica and modified nanosilica (using silane coupling agent) were prepared by melt compounding. The nanosilica prepared in the laboratory was used as reinforcing filler in PP-nylon fibre composites. The compounding characteristics and mechanical properties of the composites were studied. The equilibrium torque during compounding increased with the addition of nanosilica and modified nanosilica. The use of two types of fillers leads to synergistic effect on the mechanical properties of the composite. Composites with 1 wt.% nanosilica and 30 wt.% nylon fibre show high tensile strength, tensile modulus, flexural strength and flexural modulus. Composites modified with 1 wt.% nanosilica and 10 wt.% nylon fibre-PP composite show higher impact strength. © 2009 Elsevier B.V. All rights reserved.

Vinayasree S.,Cochin University of Science and Technology | Vinayasree S.,Government Victoria College | Soloman M.A.,St Alberts College | Sunny V.,P.A. College | And 3 more authors.
Composites Science and Technology | Year: 2013

Flexible and thin single layer microwave absorbers based on strontium ferrite-carbon black-nitrile rubber composites have been fabricated employing a specific recipe and their reflection loss characteristics were studied in the S (2-4. GHz) and X-bands (8-12. GHz). The incorporation of carbon black not only reinforces the rubber by improving the mechanical properties of the composite but also modifies the dielectric permittivity of the composite. Strontium ferrite when impregnated into a rubber matrix imparts the required magnetic permeability to the composite. The combination of strontium ferrite and carbon black can then be employed to tune the microwave absorption characteristics of the resulting composite. The complex dielectric permittivity and permeability were measured by employing a cavity perturbation technique. The microwave absorption characteristics of composites were modelled in that an electromagnetic wave incident normally on the metal terminated single layer absorber. The influence of filler volume fraction, frequency, absorber thickness on the bandwidth of absorption are discussed and correlated. © 2013 Elsevier Ltd.

Antony. A A.A.,St Alberts College | Nampy S.,University of CalicutKerala
Phytotaxa | Year: 2014

Capsule and seed morphology of 26 species of Murdannia in India are studied using light microscopy and seeds of 23 species by scanning electron microscopy. The capsules show differences in size, shape and in the number and arrangement of seeds in the locules. The seeds also display considerable variation in size, shape, ornamentation, shape of hilum and position of embryotega. The present study provides useful characters for the delimitation of Indian species of Murdannia. © 2014 Magnolia Press.

Fernandez S.,St Alberts College
AIP Conference Proceedings | Year: 2010

The major hurdle of a city planning council is to handle the traffic jam problem. The number of vehicles on roads increases day by day. Also the number of vehicles is directly proportional to the width of the road (including that of parallel roads). But it is not always possible to make roads or to increase width of the road corresponding to the increase in the number of vehicles. Also we cannot tell a person not to buy a vehicle. So trying to minimise the traffic jam is the only possible way to overcome this hurdle. Here we try to develop a method to avoid traffic jam through a mathematical approach (through fuzzy applications). This method helps to find a suitable route from an origin to a destination with lesser time than other routes. © 2010 American Institute of Physics.

Jose L.,St Alberts College | Kumar C.,St Alberts College
Nature Environment and Pollution Technology | Year: 2011

The present study has been made to evaluate the organic pollution level of four temple ponds of Mattancherry Taluk in Ernakulam district. The Palmer's algal index showed that all the four ponds have high organic pollution. Algae found in the ponds belonged to Chlorophyceae, Cyanophyceae, Euglenophyceae and Bacillariophyceae. Atoxic bloom forming algae Microcystis aeruginosa was observed in three ponds. The physico-chemical analysis data supported the Palmer's organic pollution index.

Priyadarshini S.,Indian Institute of Chemical Technology | Amal Joseph P.J.,St Alberts College | Lakshmi Kantam M.,Indian Institute of Chemical Technology
Tetrahedron | Year: 2014

Synthesis of N-aryl-γ-amino-γ-lactams by oxidative coupling of aromatic amines with 2-pyrrolidinone using catalytic amount of CuO nanoparticles is described. The procedure has broad substrate scope, good yields, complete regioselectivity and catalyst recyclability. © 2014 Elsevier Ltd.

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