Chemistry
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14540/125
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Item Preparation and Studies of Ratiometric Fluorescent Chemosenors based on the Attenuation of Excitation on energy Tranfer(2011) Acharya, Jiba Raj; EvgueniMolecular devices possessing -electron conjugated scaffold demonstrate unique capabilities as fluorescent chemosensors for the trace detection of analytes in a variety of environments. Important properties of these compounds such as charge transport and exciton migration, emission intensity etc. can be simply attenuated by external stimuli or analyte binding, leading to considerable changes in observable signals. The main goal of this Ph.D. dissertation was to study the possibility to control excitation energy migration in conjugated systems. Towards this goal, we designed surface-immobilized monodispersed oligo(p-phenylene ethynylene)s (OPEs) as a general basis for thin-film ratiometric fluorescent chemosensors. The sensor molecules have been functionalized with a specific analyte receptor at one end and a linkage for the covalent attachment to a glass surface at the opposite end. Upon surface immobilization these sensor molecules form a highly ordered monolayer with the receptors positioned at the monolayer surface. Analyte binding to the receptor causes attenuation of the HOMO–LUMO gap at the receptor terminus leading to the ratiometric change in fluorescent emission. The thin-film sensors for L-cysteine, pH and Zn 2+ were prepared and studied in detail to uncover a number of unusual properties, thus demonstrating the potential of this platform as a universal foundation for designing a broad range of fluorescent ratiometric thin-film chemosensors.Item Hydrothermal Synthesis of Carbon Dots from Lawsonia inermis Plant Extracts and Their Antimicrobial Activities(2025-04-24) Susmita Panthi; Dr. Dewal Prasad BhattaraiItem PREPARATION, CHARACTERIZATION AND APPLICATION OF ACTIVATED CARBON PREPARED FROM WALNUT SHELLS FOR ENERGY HARVESTING(2025-04-24) SUSHILA SUBEDI; Dr. Armila RajbhandariItem EVALUATION OF CHEMICAL AND BIOLOGICAL PROPERTIES OF Tinospora cordifolia (THUNB.) MIERS STEM EXTRACT FROM KAVREPALANCHOWK DISTRICT OF NEPAL(2025-04-24) SURESH BISTA; Dr. Bhushan ShakyaItem CHEMICAL AND BIOLOGICAL ANALYSIS OF LEAVES EXTRACTS OF Bauhinia variegata L. FROM SYANGJA DISTRICT OF NEPAL(2025-04-24) SONIYA BHUSAL; Dr. Ram Lal ShresthaItem ADSORPTIVE REMOVAL OF PHOSPHATE ANION FROM AQUEOUS SOLUTION USING Al(III)- LOADED SAPONIFIED WATERMELON RIND(2025-04-24) SIRJANA BHATTARAI; Dr. Ram Lochan AryalItem PREPARATION AND CHARACTERIZATION OF COCONUT SHELL DERIVED ACTIVATED CARBON FOR SUPERCAPACITOR APPLICATION(2025-04-24) SARMILA DANGI; Dr. Armila RajbhandariItem Characterisization and(2025-04-24) Samdhya Parajuli; Dr. Puspa Lal HomagaiItem ADSORPTIVE REMOVAL OF METHYLENE BLUE DYE USING ACTIVATED CARBON PREPARED FROM SEED OF TINDU (DIOSPYROS MALABARICA)(2025-04-24) SABINA SHRESTHA; Hari Bhakta OliItem PHYTOCHEMICAL SCREENING, GC-MS ANALYSIS, ANTIOXIDANT ACTIVITY, AND FTIR ANALYSIS OF Catharanthus roseus (L.) G. Don(2025-04-24) RAKESH KUMAR YADAV; Shree Dhar GautamItem EFFECTIVE BIOSORPTION OF PHOSPHATE IONS FROM AQUEOUS SOLUTION USING Fe(III)-LOADED CARBOXYL FUNCTIONALIZED BANANA PEELS(2025-04-23) Pukar Bhattarai; Dr. Dewal Prasad BhattaraiItem GREEN SYNTHESIS OF CuO@ZnO NANOCOMPOSITES USING LEAF EXTRACT OF ARTEMISIA VULGARIS AND STUDY OF ITS PHOTOCATALYTIC ACTIVITIES(Amrit Campus, 2025-04-23) Pujan Nepal; Dr. Dewal Prasad BhattaraiItem GREEN SYNTHESIS OF SILVER NANOPARTICLES USING CAMELLIA SINENSIS (TEA) LEAVES EXTRACT: CHARACTERIZATION AND STUDY OF ITS ANTIMICROBIAL ACTIVITIES(2025-04-23) Nuna Magar; Dr. Dewal Prasad BhattaraiItem KINETICS OF DEGRADATION OF DYE EXTRACTED FROM RED CABBAGE(2025-04-23) Nirmal Phuyal; Dr. Sharmila PradhanFull text available.Item CHEMICAL AND BIOLOGICAL STUDIES OF Achyranthes aspera L. FROM MAHOTTARI DISTRICT OF NEPAL(Amrit Campus, 2025-04-23) MADHU KUMARI CHAUDHARY; Dr. Ram Lal ShresthaItem EVALUATION OF PHYTOCHEMICAL CONSTITUENTS AND BIOLOGICAL ACTIVITIES OF LEAF EXTRACTS OF Calotropis gigantea (Linn) W.T. Aiton.(Amrit Campus, 2025-04-23) Keshar Lal Chaudhary; Dr. Ram Lal ShresthaItem CAFFEINE MEDIATED GREEN SYNTHESIS OF ZnO NANOPARTICLES AND Ag/ZnO NANOCOMPOSITES AND STUDY THEIR ANTIMICROBIAL PROPERTY(Amrit Campus, 2025-04-23) KABITA NEUPANE; Dr. Sharmila PradhanItem ALKALOID EXTRACT OF AGERATINA ADENOPHORA STEM AS GREEN CORROSION INHIBITOR FOR MILD STEEL CORROSION IN 1M H2SO4 ACID SOLUTION(Amrit Campus, 2025-04-23) Jamuna Thapa Magar; Hari Bhakta OliItem CORROSION INHIBITION BY ALKALOIDS EXTRACT OF CISSAMPELOS PAREIRA(Batule Lahara) STEM FOR MILD STEEL IN 1 M HCl SOLUTION(Amrit Campus, 2025-04-23) Ganesh Thapa; Dr. Deepak Kumar GuptaItem COLEBROOKEA OPPOSITIFOLIA STEM EXTRACT AS GREEN CORROSION INHIBITOR FOR MILD STEEL IN 1 M HCl SOLUTION(Amrit Campus, 2025-04-23) Dipak Pandey; Sanjay Singh