Projects & Publications

Ongoing Major Project: 2

Title Funding Agency Amount & Duration Principal investigator
Development of Completely Closed Green Recirculating Aquaculture System (CGRAS) for indoor Ornamental/ Larval fish production UGC 10.86 lakhs2012 –2015(3 years) Dr. S. Suresh Kumar(Dept of AQFM)
Integrated geoenvironmental assessment of Biyyam Kayal in the coastal tract of Malappuram district, Kerala Directorate of Environment and Climate Change 10.53 lakhs 2012-2015(3 years) Dr. K.S. Arun Kumar(Dept of Geology)

Ongoing Minor Projects: 21

Title Funding Agency Amount & Duration Principal investigator
Development of Completely Closed Green Recirculating Aquaculture System (CGRAS) for indoor Ornamental/ Larval fish production Directorate of Environment and Climate Change, Thiruvananthapuram 0.60 lakhs2013-14(Six months) Dr. Ranjeet K(Dept of AQFM)
Impact of climate change on the occurrence and distribution of some marine ichthyofauna in backwaters of Ponnani UGC 1.20 lakhs2011 to 2013(Two years) Dr. Ranjeet K (Dept of AQFM)
Diversity of Aquatic Macrophytes and associated Macroinvertibrates in freshwater systems of Malappuram Area UGC 1.35 lakhs 2011 to 2013 (Two years) Dr. M. Razia Beevi (Dept of AQFM)
An exploratory study of Antibiotic resistant strains of Escherichia coli from Ponnani fishing harbor UGC 1.40 lakhs 2012 to 2014 (Two years) Mr. Zubair A.A. (Dept of AQFM)
Integrated investigation of shallow borewell salinity around Edappal, Malappuram Dist., Kerala UGC 1.25 lakhs 2011 to 2013 (Two years) Dr. V.K. Brijesh (Dept of Geology)
Petrological and Geochemical studies of granulite facies rocks in western part of the Palaghat-Cauvery shear zone and implication for lower crustal evolution in the Archean-Proterozoic transition zone UGC 1.00 lakhs 2012 to 2014 (Two years) Dr. V.A.Ayisha (Dept of Geology)
Environmental impact of instream sand mining from low and midland regions of the Bharathapuzha river basin, Kerala, Southern India UGC 2012 to 2014 (Two years) Dr. V. Santhosh (Dept of Geology)
Vibrational spectroscopic studies of Phenylquinazoln compound UGC Rs.1.05 lakhs 2012 to 2014 (Two years) Prof. Havahumma N. (Dept of Physics)
Laser assisted non-linear characterization of conjugated polymers for photonic application UGC Rs. 0.65 lakhs 2012 to 2014 (Two years) Mr. Jayakrishnan K. (Dept of Physics)
A study on how pilgrim tourism facilitates responsible tourism with special reference to Kozhikode district UGC Rs. 0.70 lakh Mrs. Muneera. K. (Dept of Commerce)
Occupational stress and stress coping skills for fishermen with respect to Malappupam district UGC Rs. 0.45 lakh Mr. Badisha.V (Dept of Commerce)
An assessment of MGREG scheme in Malappuram District UGC Rs. 0.45 lakh Dr. T.K. Sreedharan (Dept of Commerce)
The impact of MGREG on poverty reduction and social capital formation in Palakkad district of Kerala UGC Rs. 0.40 lakh Mrs. Siji Verghese.V (Dept of Commerce)
Stress management of hospital employees of Malappuram district with special reference to Ponnani taluk UGC Rs. 1.10 lakh Mr. A.K. Abdurahiman (Dept of Commerce)
Rajendrayadav ke lekhak pathru (Hindi) UGC Rs. 0.45 lakh Dr. A.Sina (Dept of Hindi)
Synthesis and Characterization of conducting Polymer composites to explore its anticorrosive properties UGC Rs.1.85 lakhs Smt. Soumya.C.C (Dept of Chemistry)
Catalysis by nano-gold support metal modified mesoporous silica UGC Rs. 1.45 lakhs Mrs. C. Soumini (Dept of Chemistry)
Health Status of women in coastal areas of Ponnani Municipality UGC Rs. 0.85 lakhs Mrs. Asha Neendur (Dept of Economics)
Education, employment and Job Preference of Women in Ponnani Municipality UGC Rs. 0.85 lakhs Mrs. Bushra M.V (Dept of Economics)
Potential impact of climate change on surface water quality of Ponnani estuary and lower reaches of Bharathapuzha Directorate of Environment and Climate Change, Thiruvananthapuram Rs. 0.60 lakhs Dr. K.S. Arun Kumar (Dept of Geology)
Geo morphological hotspot of sea level rise along the Kerala coast with special reference to Thiruvananthapuram coast Directorate of Environment and Climate Change, Thiruvananthapuram Rs. 0.60 lakhs Dr. K.S. Arun Kumar (Dept of Geology)
Kerala Muslim Women Lives as documented in Literature, Film and History UGC Rs.0.70 lakhs Smt. Ameera. V.U (Dept of English)
Socio- realistic elements as reflected in the writings of Alaa Al-Aswany with special reference to his novel “Imara: Yaacoubian” UGC Rs.1.50 lakhs Sri. Thoufeeq (Dept of Arabic)
Role of stock brokers in investor behavior in Malappuram district, Kerala UGC Rs. 0.60 lakhs Smt. Fathima (Dept of Commerce)
Kodungallur Gurukulam, an academy of Malayalam Literature UGC Rs. 0.65 lakhs Smt. Jayasree (Dept of Malayalam)
Sediment Dynamics in a micro-tidal natural inlet bounded by breakwaters; A case study at Bharathapuzha Estuary, Ponnani, Southern India. UGC Rs.1.9Lakhs Sri.Abdul Nafih.P.K (Dept of Geology)


1. Radhakrishnan, K.V., S. Sureshkumar and H.H. Ng (2010). Pseudolaguvia austrina, a new species of sisorid catfish (Osteichthyes: Siluriformes) from Peninsular India. Ichthyol. Explor. Freshwaters, Vol. 21, No. 4, pp. 377-383.

2. Reneesha, K., K.M. Mujeeb Rahman, M. Razia Beevi, A.P. Thomas and A.A. Mohamed Hatha. (2010). Probiotic effects of Bacillus sp. on the growth and survival of larvae and post larvae of Macrobrachium rosenbergii Fish. Tech., 47(2): 173-78.

3. Razia Beevi M. and Radhakrishnan ,S. (2010). Four new species and two new form of monogenea from freshwater fishes of Kerala. India Ind.J. Mult. Res., 6 (1);65-74

4. Ranjeet K. (2010). Allozyme variations and genetic diversity among males of Macrobrachium rosenbergii. Journal of Environment and Biosciences, 24(1): 107-114.

5. Ranjeet K. (2010). Genetic Characterization of male morphotypes of Macrobrachium rosenbergii using RAPD markers. Uttar Pradesh Journal of Zoology, 30(1): 107-113.

6. Ranjeet K. and B. M. Kurup (2010). Effect of different substrata on growth, survival and production of Macrobrachium rosenbergii in polders. Journal of the Inland Fisheries Society of India, 42(1): 39-45.

7. Yohannan Panicker C., Hema Tresa Vargehse, K.R. Ambujakshan, Samuel Mathew, Subarna Ganguli, AK.Nanda, Christian Van Alsenoy, Sheena Mary,Y, (2010). Ab initio and density functional theory studies on vibrational spectra of 3-{[(4-methoxyphenyl) methylene]amino}-2-phenylquinazolin-4(3H)-one, Eur. J. Chem. 1, 37-43.

8. Yohannan Panicker C., Hema Tresa Varghese, K.R. Ambujakshan, Samuel Mathew, Subarna Ganguli, Ashis Kumar Nanda, Christian Van Alsenoy, Y.Sheena Mary, J. (2010). Vibrational spectra and computational study of 3-Amino-2-phenyl quinazolin-4(3H)-one, Mol. Struct. 963, 137-144.

9. Abdulla, K K., .K.Karunakaran Nair, N Ramachandran, K M Varier, B R S Babu, Antony Joseph.(2010). X-Ray attenuation around K-edge of Zr,Nb,Mo and Pd: A Comparative study of using PIXE and 241Am gamma rays. Pramana, Journal of Physics, 75(3), 459-469.

10.Soumini C “Preparation and Characterization of Exfoliated Polyaniline Montorillonite Nano Composites”. Material Science and Engineering.

10.Soumini C “Preparation and Characterization of Exfoliated Polyaniline Montorillonite Nano Composites”. Material Science and Engineering.

11. Soumini C “Photo Degradation of Methyl orange over Zirconium doped TiO2 using Solar Energy”. European Journal of Scientific Research.


1. Ranjeet K and B.M. Kurup (2011). Density dependent variations on the production and population structure of Macrobrachium rosenbergii reared in the wetland polders of South India. Brazilian Journal of Science and Technology, 15(2), 55-62.

2. Ranjeet. K. (2011) Difference in protein synthesis associated with male morphotypes of Macrobrachium rosenbergii as an intrinsic factor causing differential growth. Journal of Environment and Biosciences, 25(1): 109-114.

3. Ranjeet K and B.M. Kurup (2011). Standardising stocking density for freshwater prawn Macrobrachium rosenbergii (De Man, 1879) farming in coconut garden channels. Asian Fisheries Science, 24: 354-366.

4. Maya, K., Santhosh, V., Padmalal, D., Aneesh Kumar, S.R. (2012). Impact of mining and quarrying in Muvattupuzha river basin, Kerala – An overview on its environmental effects. Bonfring International Journal of Industrial Engineering and Management Science, Vol. 2, Special Issue 1, pp. 36–40.

5. Ravindra Kumar, G.R. and Sreejith, C. (2012). Contrasting geochemistry of arc-related metagranitoids in the Kerala Khondalite Belt, southern India: evidence for flat to steep transition in subduction style at the end of the Archaean. American Geophysical Union (AGU) Fall 2012 Meeting.

6. Santhosh, V., Padmalal, D., Baijulal, B., and Maya K. (2012). Brick and tile clay mining from the paddy lands of Central Kerala (South west coast of India) and emerging environmental issues. Environmental Earth Sciences, Vol.68, 2111–2121.

7. Sreejith, C. and Ravindra Kumar, G.R., 2012. MnNCKFMASH phase relations in cordierite–orthopyroxene migmatitic gneisses, southern India: implications for low-pressure crustal melting under granulite-facies. Journal of the Geological Society of India, 80, pp. 613-627.

8. Asha Neendur ."Bengali labour migration to Kerala- a study of Malappuram district".Meridian.vol.1 2012.june.number 2.pp120-125.ISSN No.2278-750X.

9. Ameera.V.U Colonialism and racism as an ancillary burden on childhood: An analysis of Toni Morrison’s Beloved and The Bluest Eye. New perspectives on post colonial literature.ISBN 978-93-5087-032-3.


1. Madhavan V S, Y Sheena Mary, Hema Tresa Varghese, C Yohannan Panicker, Samuel Mathew, Christian Van Alsenoy, Jarmila Vinsova (2012). Vibrational spectroscopic studies and computational calculations of 5-chloro-2-(3-chlorophenylcarbamoyl) phenylacetate. Spectrochimica acta. Part A, Molecular and Biomolecular Spectroscopy. 89: 308-16.

2. Razia Beevi M. and S. Radhakrishnan (2012). Community ecology of the metazoan parasites of freshwater fishes of Kerala. J. Parasitic Diseases, 44, 121-132.

3. Mohammed Nasser K.M. and S. Sureshkumar (2012). Environmental correlates of microalgal diversity in high ranges of the biodiversity hotspots, Western Ghats, India. J. Aquat. Biol. Fish., 1 (1&2), 178-187.

4. Mathew, S., S. Sureshkumar and N. Sandhyarani (2012). Synthesis and characterization of gold–chitosan nanocomposite and application of resultant nanocomposite in sensors. Colloids and Surfaces B: Biointerfaces, 28(2), 45-54.

5. Ranjeet. K and B. M. Kurup (2013). Economic analysis of polder based freshwater prawn farming systems in Kuttanad, India. International Journal of Fisheries and Aquaculture, 5(6), 110-126.

6. Ameera VU Grave Exhumed to let the Corpse Speak: A subaltern reading of T.P.Rajeevan’s Paleri Manikyam: A Midnight Murder Story. The CommonWealth Review. ISSN 0974-043

7. Padmalal, D., Nair, K.M., Kumaran, K.P.N., Sajan, K., Vishnu Mohan, S., Maya, K., Santhosh, V., Anooja, S., Limaye, R.B., 2013. Climate and Sea Level Changes in a Holocene Bay Head Delta, Kerala, Southwest Coast of India. In: J. Sundaresan, S. Sreekesh, A. Ramanathan, L. Sonnenschein, and R. Boojh (Eds.), Climate Change and Island and Coastal Vulnerability, pp. 191-208.

8. Santhosh, V., Padmalal, D., Sobha, V., Baiju, R.S., 2013. Mining of Tile and Brick Clays from the Coastal Lands of Chalakudy and Periyar Rivers, Kerala, SW India. In: R. Venkatachalapathy (Ed.), Earth Resources and Environment. pp. 328–334.

9. Santhosh, V., Padmalal, D., Sobha, V., Baijulal, B., Maya, K., 2013. Impact of Urbanization on Surface and Ground Water Resources of the Coastal Lands of Central Kerala, South West India. In: J. Sundaresan, S. Sreekesh, A.L. Ramanathan, S. Lenand, and R. Ram (Eds), Climate Change and Environment. Chapter 2.

10. Sreejith, C. and Ravindra Kumar, G.R., 2013. Petrogenesis of high-K metagranites in the Kerala Khondalite Belt, southern India: a possible magmatic-arc link between India, Sri Lanka, and Madagascar. Journal of Geodynamics, 63, pp. 69–82.

11. Vishnu Mohan, S., Padmalal, D., Santhosh, V., 2013. Palaeoclimatic Records in the Holocene Sediments of Polachira Wetland, Southern Kerala, SW India. In: J. Sundaresan, S. Sreekesh, A.L. Ramanathan, S. Lenand, and R. Ram (Eds), Climate Change and Environment. Chapter 21.

12. Sreedharan T.K. (2013). Micro enterprise development- Empowerment through “Kudumbasree mission”, Commerce and Management Explorer, in press.

13. Santhosh Babu P.C (2013). "Mula Vyavasayathinte Sadhyathakal", magazine on 'Industrial Keralam'-August 2010,Volume No.43,No.7 page no.27-29

14. Ameera VU Shakespeare’s Othello as a Victim of Miscegenation. Meridian. ISSN 2278-750X

15.Ameera VU the 'Condition of England Novels' and Victorian Women Novelists. The Criterion. ISSN 0976-8165

16.Ameera V U Denied of Bright Naaley: A study of Arundhati Roy’s The God of Small Things.Meridian. ISSN 2278-750X

17. Santhosh Babu P.C (2013."Do Demographic factors bring about Negative Affectivity? A personality trait approach", Personnel Today, Quarterly journal of NIPM,July-September,2011,Vol.XXXII.No.2,page no.17- 22

18. Sabna M 'Higgs Boson- A Qualitative Study' ; 'Meridian'-A biannual journal of MES Asmabi College.(ISSN 2278-750X).

19. Sabna M 'Carbon Nanotubes for Optical Limiting': 'Photonics Foundations and Frontiers-National Seminar Proceedings.

20. P. Pramod, C. C. Soumya and K. George Thomas. “Gold Nanoparticle-Functionalized Carbon Nanotubes for Light-Induced Electron Transfer Process” , J. Phys. Chem. Lett. 2011, 2, 775–781


1. Sureshkumar S., Ranjeet K. and K.V. Radhakrishnan (2014). Live handling and domestication of selected indigenous ornamental fishes of India. International Journal of Fisheries and Aquatic Studies, 1(5), 8-11.

2. Reyhanath P.V. and Ranjeet K. (2014). Incidence of multidrug resistant Vibrio parahaemolyticus isolated from Ponnani, South India. Iranian Journal of Microbiology, 6(2), 60-67.

3. Isamma A., Divya K.R., Ramasubramanian V., Arunjith T.S. and Sureshkumar S. (2014). Studies on probiotics administration and its influence on gut microflora of ornamental fish Brachydanio rerio larvae. International Journal of Current Microbiology and Applied Sciences, 3(8), 336-344.

4. K. M. Mohamed Nasser and S. Sureshkumar (2014). Seasonal Variation and Biodiversity of Phytoplankton in Parambikulam Reservoir, Western Ghats, Kerala. International Journal of Pure and Applied Bioscience, 2(3), 272-280.

5. Jyothi P.V. and S. Sureshkumar (2014). Preliminary documentation of aquatic Macrophytes of Kole wetlands of Northern Kerala, India. International Journal of Environmental Sciences, 5(1), 117-122.

6. K.M. Mohamed Nasser and S. Sureshkumar (2014). Habitat Wise Variation in Periphytic Microalgal Assemblages in the Vazhachal forest division of Chalakkudy River basin. International Journal of Current Microbiology and Applied Sciences, 3(6), 649-658.

7. Isamma A., Divya K.R., Ramasubramanian V., Arunjith T.S. and Sureshkumar S. (2014). Standardization of the bioencapsulation of probiotics and oil emulsion in Artemia parthenogenetica. International Journal of Research in Fisheries and Aquaculture, 4(3), 122-125.

8. S. Sureshkumar, B. Jasmin, K.M. Mujeeb Rahiman, and A.A. Hatha Mohammed. (2014). Growth enhancement of micro algae, Chaetoceros calcitrans and Nannochloropsis oculata, using selected bacterial strains. International Journal of Current Microbiology and Applied Sciences, 3(4), 352-359.

9. Aryasree P.D and Razia Beevi M. (2013). Characterization of gut bacteria in Puntius sarana, Scatophagus and Rastrelliger kanagurta. Journal of Basic and Applied Sciences, 7(3), 111-114.

10. Ranjeet. K and B. M. Kurup. (2013). Economic analysis of polder based freshwater prawn farming systems in Kuttanad, India. International Journal of Fisheries and Aquaculture, 5(6), 110-126.

11. Ranjeet K. (2013). Ecological implications of shark fishing and path for conservation. Vimala International Research Journal for Pure and Applied Science, 1(1), 73-80.

12. Ranjeet K, Divya Das K, Fathimath Shamsiya MP and K. Reshmi (2013) Effect of Ekalux toxicity on selected physiological parameters in Anabas testudineus. Applied Ecology and Environmental Research, 11(4), 569-580.

13. K Muhamm ed Abdurahman, Mohamed Aslam, K Rubeena, M M Musthafa, M Sudarshan, and Sidharth Trace elements analysis of Nishakatakaadi kashayam, prepared by different manufacturers, using EDXRF, proceedings of 24th swadeshi science congress 2014

14. , Mohamed A slam, K Muhammed Abdurahman, K Rubeena, M M Musthafa, M Sudarshan, and Sidhartha. Trace element study of some herbs used for treating diabetis employing Energy Dispersive X-Ray Fluorescence techniqu proceedings of 24th swadeshi science congress 2014.

15. Asha Neendur."Role of women in achieving food security in rural development of Kerala.” Meridian vol.2.2014 january number 3.pp 77-82.ISSN no.2278-750X

16. Ameera V.U. ‘Behind the Veil: A Journey into the lives of Pakistani Muslim Women through Qaizra Shaharaz’ novels The Holy Woman and Typhoon.” Meridian vol.2.2014 July. ISSN no.2278-750X



Minor Research Project Submitted to the University Grants Commission

Executive Summary

Estuarine environments are one of the most dynamic aquatic ecosystems and serve many important functions in coastal waters. Often referred to as nurseries, estuaries play an important role in many species lifecycles, including fishes, providing food abundance and shelter to marine fish larvae and juveniles and therefore maximizing their survival. Larval fish dynamics contribute significantly to understanding the ecology of fish populations as they can indicate the spawning-stock biomass and recruitment in adult fish stocks. Initial development stages of fishes are particularly vulnerable and are influenced by physical and biological processes. Hence this study aimed to characterize ichthyoplankton assemblages, to evaluate environmental influence in its structure. Present study is a pioneering work to investigate the availability of adult and larvae of commercially important marine fishes in backwaters of Ponnani.

A highly diverse assemblage of adults of commercially important fishes was recorded from the study area which included 35 species belonging to 23 families. Among the most widely distributed species were Sillago sihama, Liza parsia, Daysciaena albida and Strongylura strongylura. The landing pattern of marine fishes in the region showed a definite pattern with the first eight species together contributing to 87% of the commercial marine fish catch. While analysing the diversity of marine fish larvae it was seen that a clear differentiation in the distribution pattern in the three stations of Ponnani backwaters was discernible. Throughout the study period 14 families of marine fish larvae were identified of which 12 were classified as commercially important. Also eight typical marine families were also noticed in the present study. Most families recorded in this study are common in equatorial and tropical estuarine regions, and have previously been recorded in estuaries of Kerala. The occurrence of coastal species in estuaries is due to the similarity of these ecosystems to coastal waters. Hence the region is ecologically significant for marine fisheries.

The distribution of marine fish larvae in the three stations was diverse. While Siganidae was the dominant group in Veliyancode, it was Belonidae and Sillaginidae at Ponnani and Biyyam respectively. It was also seen that representation of commercially important groups was highest in Veliyancode (12) and least in Biyyam (7). Results clearly indicated the role of environmental parameters in determining the vertical and horizontal distribution of marine fish larvae in Ponnani backwaters. The present study clearly points out that Ponnani estuary has turned out to be a very good nursery ground for many marine fishes. This could be witnessed by the presence of large numbers of their larval population as recorded in the present study. A noteworthy observation was that out of the 11 economically important marine fish families encountered in the fish landings, the young ones of seven families were observed in the larval collections.

Ponnani backwater fish larvae assemblages displayed a clear seasonal pattern presenting higher abundances and diversities during warmer months. The main effects of dry events apparently did not affect fish larval community structure but changes in estuarine salinity gradient appear to lead to related changes in marine species distribution. Therefore, river flow played a key role in structuring the ichthyoplankton assemblage thus representing also an important retention mechanism responsible for a successful larval development and recruitment. A detailed analysis made to study the interaction of selected environmental parameters with ichthyofaunal diversity in Ponnani backwater provided an clear understanding on the influence of these variables on the distribution of marine fish larva in the region. Results of the present analysis provided a model for the prediction of larval diversity from the prevailing environmental parameters. The statistical evidence suggested that there exist high spatial heterogeny among the relationship between environmental variables and microalgal diversity. The present investigation confirms that there exists variation in combination of environmental variables, which contribute substantially to the diversity of marine larval forms with respect to the region and season. The positive correlation between temperature, salinity and larval abundance in different regions irrespective of seasons indicate that thermal and haline conditions must be controlling factor on ichthyoplankton assemblages. The present study establishes that the ichthyofaunal diversity of the different regions in Ponnani backwater is controlled by a combination of environmental factors.

The Ponnani backwater system has been the least studied although it contributes substantially to the fishery resource of the region. The importance of this backwater is that it received Kerala’s second largest river and drains out to the Arabian Sea. The wide diversity of marine fish fauna earlier documented in the region emphasised the need to study the distribution pattern of adult and larval form. Ponnani is one of the leading marine fish landing centre of the state. This paved the way to investigate whether the estuary has been used by marine fishes of the region as a breeding ground. Throughout the year there is a wide fluctuation in salinity, temperature and primary productivity in these backwaters enabling it to be classified under stressful environment for larval forms of certain economically important marine fishes. Within this context, stressful estuarine ecosystems (i.e. with highly fluctuating environmental conditions) provide a unique opportunity to investigate the effect of environmental disturbances on juvenile fish growth and consequently to provide information on their potential impact on future populations. The larval fish community observed in this study is composed by families with different patterns of ecological uses of the estuarine environment. The diversity of adult fish previously recorded from this region and the number of larvae of commercially important fishes identified in this study, emphasize the importance of this estuary for the Ponnani coast.

Results emerging from the study highlight the ichthyofaunal biodiversity in Ponnani backwaters and emphasize the need for future conservation of estuaries as nurseries for these fishes. Since the most important variable found to influence ichthyofaunal distribution was temperature and salinity any climatic change which results in the sea surface temperature rising has a likelihood that in future the backwaters in coastal regions of the country may turn out to be fertile nursing grounds for some marine species, which can tolerate salinity. From the results gathered from the present study it could be concluded that the ichthyofaunal resource of Ponnani backwaters is diverse and the region has a wealth of ichthyoplankton of commercially important marine fishes The information generated from this study will be useful for the decision makers for in situ conservation of marine fish community in general and individual fish species in particular and develop strategies for effective utilization of the estuarine environment by taking into account the impact of individual environmental parameters impacting on it.



The preparation and NLO characterization of photosensitive polyesters containing azoaromatic residues in the molecular backbone, functionalized with orthohydroxy chromophores is presented. Samples were studied for its UV-vis absorption, FT-IR and intensity dependent nonlinear absorption properties. Nonlinear characterization was carried out with z-scan using frequency doubled, Q-switched Nd:YAG laser operating at 532nm. The closed aperture z-scan spectra reveal the self defocusing effects of the samples with negative nonlinearity coefficient (n2) showing values as high as -1.28x10-10(esu) for certain samples and the corresponding third order susceptibility coefficient of the order of 29.9x10-12(esu). Degenerate Four Wave Mixing technique was employed to substantiate the findings. The numerical fits show that the molecules exhibit reverse saturable absorption with absorption cross section greater for the excited state than the ground state. A study of beam fluence dependence of nonlinear absorption coefficient (βeff) has been presented. All phenomena indicate that molecules are reverse saturable absorbers whose optical limiting property gets enhanced with increasing conjugation length. Hence, the strategy for designing these molecules and the product compounds thus obtained can find immense applications in photonic devices especially in optical limiting type of applications.


Summary of the minor research project under taken by Smt. Soumini.C , Assistant Professor, Department of Chemistry during the plan year 2013-15

Mesoporous materials are those containing pores with diameters between 2 and 50 nm. Their properties can be tuned to our need during their synthesis. SBA-15 is one among them with long homogeneous mesochannels, high surface area and thermal stability. It is an attractive support for metal nano particles. Catalysts consisting of gold nano particles on heterogeneous supports have received considerable attention over the past few years as an efficient alternative for pollutant, non separable homogeneous catalysts. But gold particles are extremely mobile on silica surfaces and will sinter and aggregate together to form very large unreactive particles when treated at high temperatures. One possible solution is to modify the silica surfaces. Fuctionalised mesoporous silica can act as a better support for gold nano particles. The gold nano particles are well dispersed in the channels of mesoporous silica. Our aim is to monitor the properties of the gold loaded metal oxide doped mesosilica for its application in catalysis. Here metal oxides of titania and zirconia are used for surface modification by wet impregnation method. Nano gold on metal modified silica is prepared using chloroauric acid solution as precursor under basic conditions. The prepared catalysts are named as xAuXMSBA15 where x is the percentage of Au metal incorporated, X denotes the percentage of transition metal loaded and M denotes the transition metal Zr or Ti which is loaded on SBA-15. The prepared catalyst is characterized using various methods such as FTIR, XRD, UV vis DRS, TEM, BET surface area etc to investigate the improvement in catalytic activity upon gold loading. Mesoscopic ordering of SBA-15 is evidenced from the low angle XRD pattern. Surface plasmon resonance is evident from the diffuse reflectance UV spectra of gold incorporated metal loaded SBA 15 catalyst characteristics of gold in nano regime. Nano particle size of prepared catalysts is also evident from the TEM results. Adsorption isotherm is of type IV with hysterisis loop H1 characteristics of cylindrical open pores with narrow pore size distribution for the prepared catalysts. Liquid phase oxidation of styrene, vapour phase reduction of nitrobenzene, liquid phase reduction of nitrophenol, coupling reactions etc are carried out. The prepared systems are active and selective for oxidation, reduction as well as coupling reactions under mild conditions.