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Dinda Fariesta Nugraha,김은영,장동욱 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
In this study, two D-A type polymeric backbone was constructed by coupling of the electron-donating chlorinated-benzodithiophene (BDT) and the electron-accepting triphenylamine-substitued quinoxaline derivatives. In addition, the strong electron-withdrawing fluorine atom and cyano unit were selectively incorporated into the quinoxaine moeity to investigate their effects on the photovoltaic properties of the polymers. After confirming the polymer properties, the photovoltaic properties of the polymers were investigated by fabricaitng the inverted-type device with the configuration of ITO/SnO/Polymers:Y6/MoO₃/Ag. Interestingly, the photovoltaic properties of the polymers are strongly dependent on the type of the electron-withdrawing substituents in their structures. Therefore, this study can offer meaningful insights in the structure-property relationships of conjugated polymers for developing high performance polymer solar cells.
Gum odina: a novel matrix forming material for sustained drug delivery
Dinda, Subas Chandra,Mukherjee, Biswajit,Samanta, Amalesh 경희한의학연구센터 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.2
The study concerns the evaluation of natural gum odina as novel sustained release matrix forming material in tablet formulation. Matrix tablets were prepared by wet granulation technique. Diclofenac sodium was used as model drug. The tablet weight (250 mg) and diameter (9 mm) was kept constant. The tablets were evaluated for physicochemical properties, drug content uniformity and in vitro drug release kinetics. The effect of gum concentration (10, 20, 30 and 50% $w/w$ with respect to total tablet weight) on in-vitro drug release profile was examined and compared with diclofenac sodium (Voveran SR-100), the slow release marketed formulation developed in India. The drug-gum (excipient) interactions using FTIR (Furrier Transform Infrared) spectrum ensures its safe use as matrix forming material. The prepared matrix formulations were found to be having near zero order release kinetics of diclofenac sodium with good strength and acceptable physicochemical properties. The formulations were found to be sustained delivery of the drug up to 24 h. The $t_{1/2}$ of the various matrix tablets (with 10%, 20%, 30% and 50% $w/w$ of gum odina) found to be more than 11 h, where as that of the marketed formulation (Voveran SR) found to be 8 h. It has been found that as the %ge of gum increases the retardation of drug release from the formulation also increases. The matrix tablet with 20% $w/w$ of gum odina was found suitable to formulate swelling controlled matrix that releases the drug by diffusion. It is concluded that the gum odina possess substantial matrix forming property that could be used for sustained drug delivery.
Dinda Fariesta Nugraha,손동환,Ratri Puspita Wardani,이석우,WHANG PATRICK DONG,김주현,Dong Wook Chang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
In this study, strategic structural modifications of quinoxaline-based polymers were performed toimprove their photovoltaic properties. First, an indacenodithiophene (IDT) unit was connected tomethoxy-substituted quinoxaline via a thiophene linker to produce the reference polymer, PIDTQxTM. The electron-accepting quinoxaline unit was surrounded by the electron-donating IDT and methoxygroup in its horizontal and vertical directions, respectively, creating a beneficial two-dimensionalconfiguration. Subsequently, two promising attempts to position the electron-pulling fluorine atom onthe quinoxaline acceptor and replace IDT with a more extended indacenodithieno[3,2-b]thiophene unitwere sequentially performed to afford the objective polymers PIDT-FQxTM and PIDTT-FQxTM, respectively. Because of the positive and synergistic effects, the photovoltaic characteristics of the polymersin an inverted-type non-fullerene polymer solar cell gradually enhanced in the order of PIDT-QxTM,PIDT-FQxTM, and PIDTT-FQxTM, with power conversion efficiencies of 6.50%, 7.82%, and 8.51%, respectively. The best performance from the device with PIDTT-FQxTM is primarily ascribed to the superiorshort-circuit current density to that of the others.
Production of bio-epoxide and bio-adhesive from non-edible oil
Srikanta Dinda,Nikhil Sainath Reddy Veeram,Ramesh Babu Adusumalli 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
Epoxidation of Nahor oil was performed by H2O2 in the presence of acid catalyst at 50 oC. It was possible to obtain around 70% epoxide yield within 8 hrs of reaction. Amberlite IR 120H showed better epoxide yield compared to H2SO4 and Dowex 50 WX8. The performance of carboxylic acids was found to be in the order of formic acid>acetic acid>propanoic acid. The curing of epoxidized nahor oil involved using ethylenediamine (EDA) and diethylenetriamine (DETA). The adhesive property of the cured resins was tested and compared with commercially available glue. The force required to detach the cardboard joint was about 36.3 N for DETA-cured resin.
Santanu Dinda,Subrata Ghosh,Nilanjana Das Chatterjee 대한공간정보학회 2019 Spatial Information Research Vol.27 No.2
The transportation system is considered the most important element of urban infrastructure and therefore, contemporary urban research precise more emphasis on the well-managed sustainable transport system. Accessibility and connectivity are two important tools regarding urban mobility, trip generation and modal choice as well as transportation management. The assessment of transport suitability is now the central part of transport management. From these perspectives, this study has been focused on the patterns of urban mobility and modal choice on the basis of transport accessibility and suitability. The Jamshedpur city and five adjoining urban areas are selected for assessment. The GIS-based accessibility modeling and network analysis have been used in this study. Moreover, the empirical field survey has also been made for the assessment of trip generation in selected nodes. Therefore, the analytic hierarchy process (AHP) was applied to assess the nature and patterns of trip occurrences and content validity ratio (CVR) and consistency ratio (CR) were used for validation. Furthermore, transport suitability index (TSI) in the different traffic zones were measured. The result shows that Jamshedpur is the most suitable in existing transportation supply–demand system as well as sustainable transportation management.
Gum odina: a novel matrix forming material for sustained drug delivery
Subas Chandra Dinda,Biswajit Mukherjee,Amalesh Samanta 경희대학교 융합한의과학연구소 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.2
The study concerns the evaluation of natural gum odina as novel sustained release matrix forming material in tablet formulation. Matrix tablets were prepared by wet granulation technique. Diclofenac sodium was used as model drug. The tablet weight (250 mg) and diameter (9 mm) was kept constant. The tablets were evaluated for physicochemical properties, drug content uniformity and in vitro drug release kinetics. The effect of gum concentration (10, 20, 30 and 50% w/w with respect to total tablet weight)on in-vitro drug release profile was examined and compared with diclofenac sodium (Voveran SR-100), the slow release marketed formulation developed in India. The drug–gum (excipient) interactions using FTIR (Furrier Transform Infrared) spectrum ensures its safe use as matrix forming material. The prepared matrix formulations were found to be having near zero order release kinetics of diclofenac sodium with good strength and acceptable physicochemical properties. The formulations were found to be sustained delivery of the drug up to 24 h. The t1/2 of the various matrix tablets (with 10%, 20%, 30% and 50% w/w of gum odina) found to be more than 11 h, where as that of the marketed formulation (Voveran SR) found to be 8 h. It has been found that as the %ge of gum increases the retardation of drug release from the formulation also increases. The matrix tablet with 20% w/w of gum odina was found suitable to formulate swelling controlled matrix that releases the drug by diffusion. It is concluded that the gum odina possess substantial matrix forming property that could be used for sustained drug delivery.