Jude Martin, Mendez; Dr.George, K E(Cochin University of Science & Technology, October , 2009)
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Abstract:
This study was undertaken in order to upgrade blends of HDPE and
PP, two of the most widely used standard plastics so as to widen their
application spectrum. Dicumyl peroxide was used as the modifier for the
upgradation. Optimum concentration of dicumyl peroxide required for
modification was detennined by measurement of mechanical, rheological,
thermal and morphological properties. Selected blends were used to prepare
recyclable composites with nylon clothes by compression moulding. The
composites were characterized by measurement of mechanical and thermal
properties. The composites were recycled and the mechanical propertics of
the recycled material were determined.
Description:
Dept.of Polymer Science and Rubber Technology,
Cochin University of Science and technology
Rinku Mariam, Thomas; Dr.George, K E; Dr.Mathew, K T; Dr.Prathapan, S(Cochin University of Science & Technology, May , 2005)
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Abstract:
The thesis deals with the preparation and dielectric characterization of
Poly aniline and its analogues in ISM band frequency of 2-4 GHz that includes part
of the microwave region (300 MHz to 300 GHz) of the electromagnetic spectrum
and an initial dielectric study in the high frequency [O.05MHz-13 MHz].
PolyaniIine has been synthesized by an in situ doping reaction under different
temperature and in the presence of inorganic dopants such as HCl H2S04, HN03,
HCl04 and organic dopants such as camphorsulphonic acid [CSA],
toluenesulphonic acid {TSA) and naphthalenesulphonic acid [NSA]. The variation
in dielectric properties with change in reaction temperature, dopants and
frequency has been studied. The effect of codopants and microemulsions on the dielectric properties has also been studied in the ISM band. The ISM band of
frequencies (2-4 GHz) is of great utility in Industrial, Scientific and Medical (ISM)
applications. Microwave heating is a very efficient method of heating dielectric
materials and is extensively used in industrial as well as household heating
applications.
Description:
Department of
Polymer Science and Rubber Technology,Cochin University of Science and
Technology
Rahana, Yoosuf; Dr.Jayaraj, M K(Cochin University of Science & Technology, October , 2007)
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Abstract:
Two stage processes consisting of precursor preparation by thermal
evaporation followed by chalcogenisation in the required atmosphere is
found to be a feasible technique for the PV materials such as n-Beta In2S3,
p-CulnSe2, p-CulnS2 and p-CuIn(Sel_xSx)2. The growth parameters such as
chalcogenisation temperature and duration of chalcogenisation etc have been
optimised in the present study.Single phase Beta-In2S3 thin films can be obtained by sulfurising the indium
films above 300°C for 45 minutes. Low sulfurisation temperatures required
prolonged annealing after the sulfurisation to obtain single phase Beta-1n2S3,
which resulted in high material loss. The maximum band gap of 2.58 eV was
obtained for the nearly stoichiometric Beta-In2S3 film which was sulfurised at
350°C. This wider band gap, n type Beta-In2S3 can be used as an alternative to
toxic CdS as window layer in photovoltaics .The systematic study on the structural optical and electrical properties of
CuInSe2 films by varying the process parameters such as the duration of
selenization and the selenization temperature led to the conclusion that for
the growth of single-phase CuInSe2, the optimum selenization temperature is
350°C and duration is 3 hours. The presence of some binary phases in films
for shorter selenization period and lower selenization temperature may be
due to the incomplete reaction and indium loss. Optical band gap energy of
1.05 eV obtained for the films under the optimum condition.In order to obtain a closer match to the solar spectrum it is desirable to
increase the band gap of the CulnSe2 by a few meV . Further research
works were carried out to produce graded band gap CuIn(Se,S)2 absorber
films by incorporation of sulfur into CuInSe2. It was observed that when the
CulnSe2 prepared by two stage process were post annealed in sulfur atmosphere, the sulfur may be occupying the interstitial positions or forming
a CuInS2 phase along with CuInSe2 phase. The sulfur treatment during the
selenization process OfCu11 ln9 precursors resulted in Culn (Se,S)2 thin films.
A band gap of 1.38 eV was obtained for the CuIn(Se,S)2.The optimised thin films n-beta 1n2S3, p-CulnSe2 and p-Culn(Sel-xSx)2 can be
used for fabrication of polycrystalline solar cells.
Description:
Department of Physics,
Cochin University of Science and Technology
Vineetha, C P; Dr Babu, C.A(Cochin University of Science and Technology, June 22, 2015)
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Abstract:
The renewable energy sources (RES) will play a vital role in the
future power needs in view of the increasing demand of electrical
energy and depletion of fossil fuel with its environmental impact. The
main constraints of renewable energy (RE) generation are high capital
investment, fluctuation in generation and requirement of vast land area.
Distributed RE generation on roof top of buildings will overcome these
issues to some extent.
Any system will be feasible only if it is economically viable and
reliable. Economic viability depends on the availability of RE and
requirement of energy in specific locations. This work is directed to
examine the economic viability of the system at desired location and
demand.
Ajitha, S; Dr.Sugunan, S(Cochin University of Science and Technology, September , 2008)
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Abstract:
Mesoporous materials are of great interest to the materials community because of their potential applications for catalysis,separation of large molecules,medical implants,semiconductors,magnetoelectric devices.The thesis entitled 'Ordered Mesoporous Silica as supports for immobilization of Biocatalyst' presents how the pore size can be tuned without the loss in ordered structure for the entrapment of an industially important biocatalyst-amylase.Immobilization of enzymes on ordered mesoporous material has triggered new ooportunities for stabilizing enzymes with improved intrinsic and operational stabilities.
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
Kannan, V; Dr. Sreekumar, K(Cochin University of Science & Technology, August , 2011)
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Abstract:
Catalysis is a technologically important field which determines the quality of life in future. Catalyst research in pharmaceutical industry,fine chemical synthesis and emission control demands supported catalysts in bulk quantities.In the present work it was observed that clay supported catalysts mentioned in various chapters could also be used for the synthesis of similar molecules. The K10Ti catalyst can be used for the synthesis similar substituted imidazole derivatives under solvent free conditions and synthetically important Mannich bases of substrates containing various substitutes.Al-pillared saponite can be used for acetalation of other polyhydroxy compounds like glycerol,mannitol etc.Cu-Pd KSF catalyst has found application in C-C bond forming reactions which can be applied to other reactions and similar methods can be adopted for the synthesis of other catalyst by changing the transition metals. Montmorillonite K10 catalysed synthesis of triarylpyridines can be extended to the synthesis tetrasubstuted pyroles.K10Ti can also be utilized for the synthesis of similar heterocycles.
Description:
Dept.of Applied Chemistry,Cochin University of Science and Technology
Jacob,T V; Dr.Ramachandra, Poduval P(Cochin University of Science and Technology, March 30, 1990)
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Abstract:
The term 'organisation' is used in different contexts. In this study,
organisation is considered as a 'socio—technical system. Alienation, as a term and as a theme, are found in many writings from very early times. But the concept and emphasis differ. The writers who have explained alienation includes theologians, philosophers, anthropologists, economists, political scientists, historians, psychologists and sociologists
Description:
School of Management Studies, Cochin University of
Science and Technology
Srinivasa, Gopal T K; Dr. Hridayanathan, C(Cochin University of Science and Technology, April 28, 1993)
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Abstract:
Packaging is important not only in extending the shellife of fish and fishery products but also improving their marketability. In the recent years, significant development have taken place in the packaging industry. During the past decade in India, there is almost a packaging revolution with the availability of variety packaging materials, thus generating better packaging consciousness in other producer/manufacturing industries. But unfortunately, such realisation is not forthcoming in the fisheries sector and packaging techniques for local and export trade continues to be on traditional lines with their inherent drawbacks and limitations. Better packaging ensures improved quality and presentation of the products and ensures higher returns to the producer. Among several packaging materials used in fishery industry, ISI specifications had been formulated only for corrugated fibre board boxes for export of seafoods and froglegs. This standard was formulated before containersiation came into existance in the export of marine products. Before containerisation, the standards were stringent in view of the rough handling, transportation and storage. Two of the common defects reported in the master cartons exported from India are low mechanical strength and tendency to get wet. They are weakened by the deposits of moisture caused by temperature fluctuations during loading, unloading and other handling stages. It is necessary to rectify the above defects in packaging aquatic products and hence in the present study extensive investigations are carried out to find out the reasons for the damage of master cartons, to evolve code of practice for the packaging oi frozen shrimp for exports, development of alternative style of packaging for the shipping container, development of suitable consumer packaging materials for fish soup powder, cured dried mackeral, fish pickles in oil and frozen shrimp. For the development of suitable packaging materials, it is absolutely essential to know the properties of packaging materials, effect of different packaging materials on theirshelf life and their suitability for food contact applications.
Description:
Department
of Industrial Fisheries, Cochin University of Science and
Technology
Rani, Rajan; Dr.Radhakrishnan, K V(Cochin University Of Science And Technology, April , 2013)
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Abstract:
The reactions involving fulvenes and its derivatives have received a great
deal of attention over the years in synthetic organic chemistry. Functionalizations
of fulvenes provide versatile and powerful approaches to various polycyclic
systems and natural products. They serve as versatile intermediates in the
construction of various ring systems through inter- as well as intramolecular
cycloadditions. Compared to the rich literature on the cycloaddition reactions of
pentafulvenes, much less attention has been paid to the synthetic utilization of
their cycloadducts. Tactical manipulations on the chosen adduct offer the
prospects for designing a variety of useful molecular skeletons.
Addition of heterodienophiles to fulvenes offers an efficient strategy towards
the synthesis of azabicyclic olefins. However, there have been no serious attempts
to study the synthetic utility of these substrates. In this context and with the
intention of utilizing pentafulvenes towards synthetically important molecules, author
decided to explore the reactivity of pentafulvene derived azabicyclic olefins. Our
attention was focused on the synthetic potential associated with the ring opening
of fulvene derived bicyclic hydrazines under palladium catalysis. It was envisioned
that the desymmetrization of these adducts using various soft nucleophiles will
provide a novel access to synthetically and biologically important alkylidene
cyclopentenes. The investigations along this line form the focal theme of this
thesis entitled “PALLADIUM CATALYZED CARBONCARBON/
CARBON-HETEROATOM BOND FORMATION REACTIONS
UTILIZING PENTAFULVENE DERIVED BICYCLIC HYDRAZINES
Description:
Organic
Chemistry Section, National Institute for Interdisciplinary Science and Technology