Papers by Swapan Kumar Ghosh
AIP Advances
Organic solar cells (OSCs) are promising for low emissive photovoltaic technology. Excitonic abso... more Organic solar cells (OSCs) are promising for low emissive photovoltaic technology. Excitonic absorption and charge generation to transport process OSC energy loss lessening are central. In this context, donor–acceptor barrier offset, related binding, and thermal effect on energy loss are the key challenge. Semitransparent organic solar cell visible band transmission and near infrared band absorption are anticipated. Near infrared band absorption in a Si material solar cell is higher that supports more energy conversion. Moreover, greater carrier selectivity and open circuit voltage (Voc) is incredible to increase the energy efficiency. OSC utmost absorption but carrier generation and charge transfer state donor–acceptor barrier offset increases carrier recombination loss. Upon analysis of small molecule donors and polymers along with non-fullerene and previously studied fullerene acceptors, it is realized that active material morphology, thickness, and interface design are impending...
Acta Mycologica
Three forests, Beliatore, Gangajal-ghati (G-ghati), and Joyur, were surveyed for mushroom collect... more Three forests, Beliatore, Gangajal-ghati (G-ghati), and Joyur, were surveyed for mushroom collection and biodiversity. Mushrooms in the rhizospheric zone of some trees, such as Shorea robusta, Petrocarpus marsupium, Terminalia bellrica, and Madhuca indica, were identified at the molecular level as Asterius asiaticus. Thereafter, the ecological diversity of this mushroom was determined in the forests. The diversity indices of Shorea robusta in the Beliatore, Joypur, and Gangajal-ghati forests were 2.303, 2.178, and 2.36, respectively. Notably, the diversity index of Madhuca indica in the Beliatore and Joypur forests was nearly the same as that in the Gangajal-ghati forest, with a value of 2.29. The total phenolics contents of the hot water, acetone, and hexane extracts of this mushroom were 6.8 ± 0.15, 3.95 ± 0.15, and 2.16 ± 0.26 mg GAE/g, respectively, and the total flavonoid contents were 2.03 ± 0.12, 1.65 ± 0.2, and 1.01 ± 0.08 mg QE/g, respectively. The ascorbic acid contents in...
Sustainability
In the 21st century, a great amount of electrical and electronic waste (e-waste) has accumulated,... more In the 21st century, a great amount of electrical and electronic waste (e-waste) has accumulated, and the unregulated nature of its disposal and recycling represents a particular hazard in a global context. For the purposes of e-waste management, there must be more emphasis on the scientific processes for recycling, reusing and remanufacturing precious materials. Resource management is related to energy management; therefore, the harvesting of costly materials from e-waste is important for both energy management and sustainable development. At present, a lack of scientific recycling of a significant amount of e-waste is a source of environmental pollution and health hazards that are having a detrimental effect on sustainable development goals. It is necessary to find a process for recovering valuable materials from e-waste with the minimum possible environmental impact. At present, it is essential to modify the process of electrical and electronic products (e-products) becoming e-wa...
Optimization of Fabric Parameters on the Effectual Properties of Nonwoven Industrial Wipes Blend using Response Surface Methodology
Indian Journal of Fibre and Textile Engineering
Development in technical in textiles especially nonwoven fabrics/materials offers a brightly limi... more Development in technical in textiles especially nonwoven fabrics/materials offers a brightly limitless prospect for the textile industry to lance into an extensive series of applications ranging from earth to space and beyond. Nonwoven industrial wipes fabric properties are the result of production technology and the combination of fabric constructional parameters. This work looks into the effect of fabric parameters on the desired properties of nonwoven industrial wipes fabricated by needle punching technique with the utilization of viscose and polyester fibres and their blends using RSM. The basic and essential characterization techniques to obtain information related to physiochemical properties of the nonwoven fabrics, using analytical investigation techniques have been evaluated. The results obtained established that the fabric parameters have a great influence on the nonwoven fabric structure and ultimately its properties. The result revealed that higher content of PET fibres ...
Due to climatic changes, anthropogenic activity and pollution, new variants of known species of h... more Due to climatic changes, anthropogenic activity and pollution, new variants of known species of human pathogens are emerging. Similarly, non-pathogenic Trichoderma spp are becoming pathogenic via molecular evolution. The literature survey provides us that some spp of Trichoderma (T. longibrachiatum, T. viride, T. koningii, T, harzianum, T. citrinoviride, T. reesii, T. atroviride and T. pseudokoningi) infected some organs of patients which were immune-compromised. These are the case of “cross-kingdom host jumps”. The first case report was found in 1970. Latest case report was presented in 2019. So, after 50 years, 42 cases or episodes of Trichoderma infection to human have been recorded. In maximum cases T. longibrachiatum was involved. Proposed pathogenecity factors, molecular evolution and a hypothetical linage of evolution of clinical Trichoderma have been presented here. Although, this opportunistic pathogen is still not reported in COVID-19 patients, it may infect them as COVID-...
Self-healing materials are no more an illusion and we are not far away from the days when manmade... more Self-healing materials are no more an illusion and we are not far away from the days when manmade materials can restore their structural integrity in case of a failure. For example, the cracks in buildings can close on their own or the scratches on car bodies can recover their original shiny appearance by itself. Indeed, this is what everyone can see in case of the natural healing of wounds and cuts in living species. Virtually, all materials are susceptible to natural or artificial degradation and deteriorate with time. In the case of structural materials the long-time degradation process leads to microcracks that causes a failure. Thus, repairing is indispensable to enhance reliability and lifetime of materials. Though scientists are inspired by the natural process of blood clotting or repairing of fractured bones, incorporating the same concept into engineering materials is far from reality due to the complex nature of the healing processes in human bodies or other animals [1–6]....
Reduction of carbon foot print in constructions is currently attracting global attention warranti... more Reduction of carbon foot print in constructions is currently attracting global attention warranting innovations in construction technology with stress on eco-congruity. The relentless use of by-products of fossil fuel and mining of stones in road construction has led to gradual shift from conventional materials in road construction to innovative less polluting construction ingredients. Natural fibres are gradually emerging as essential ingredients of various types of Geotextiles. Development of Jute Geotextiles (JGT) is a pointer in this direction. Besides its effectiveness in carbon sequestration and eco-compatibility from cradle-to-grave, diverse applications of JGT are being conceptualized with thrust on R & D meeting most of the technical requirements needed for the major geotechnical applications. This paper delineates physical characteristics of Jute fibre and some of the innovative R & D exercises on JGT executed so far in connection with carbon foot print reduction in civil ...
Nanofiber-reinforced biocomposites
Fiber-Reinforced Nanocomposites: Fundamentals and Applications, 2020
Abstract Within the last decade, there had been developments aiming at alternative means to reduc... more Abstract Within the last decade, there had been developments aiming at alternative means to reduce human impact on the environment through green chemistry. The biocomposites (BCMs) are evidently occupied into this affinity with several bio-sourced BCM. This chapter discusses BCM for diverse category of nanofiber (NF)-reinforced BCMs. The chapter explores the overall study on the influence of NFs on the performance/properties of BCM and their applications in biomaterials focused only on cellulose NF- and carbon nanofiber (CNF)-reinforced BCMs. The preparation techniques for both NFs and BCMs have been explored. Also different characterization techniques reportedly applied in the study of these set of materials have been covered in this chapter. Again the challenges and ways toward the implementation of these novel nanomaterials within the last decade are reported here. Challenges in NF-reinforced BCM have been partially met through the modification of the nanofillers or the matrices. Along with this, the chapter also explored a couple of issues to improve the processing techniques of NFs and its reinforcement in BCMs as ultimate products.
Cellulose nanofibrils in bio-nanocomposite films and their applications
The application of cellulose nanomaterials (nanocellulose (NC)), especially cellulose nanofibrils... more The application of cellulose nanomaterials (nanocellulose (NC)), especially cellulose nanofibrils (CNFs), in biopolymer nanocomposites has recently received a lot of attention from material science researchers aimed at developing industrially novel applicable polymer nanocomposites. A branch of research within this niche is the biopharmaceutical industry. Here, we discuss CNFs and their application in biopolymer nanocomposites for the delivery of drugs. This chapter focuses on the utilization of CNF-biopolymeric nanocomposites as a novel effective vehicle for the delivery of pharmaceutical drugs. The interaction between CNFs and specific therapeutic drugs is an area for further investigation.
Author(s) Ghosh, Swapan K.; Tsujii, Kaoru Citation Journal of Chemical Physics, 132(14): 144503 I... more Author(s) Ghosh, Swapan K.; Tsujii, Kaoru Citation Journal of Chemical Physics, 132(14): 144503 Issue Date 2010-04-14 Doc URL http://hdl.handle.net/2115/43029 Right Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Chem. Phys. 132, 144503 (2010) and may be found at http://link.aip.org/link/?jcp/132/144503 Type article
PLOS Neglected Tropical Diseases, 2020
In human communities inhabiting areas-such as West Bengal-India-where perpetuate the pre-imago & ... more In human communities inhabiting areas-such as West Bengal-India-where perpetuate the pre-imago & adult developmental stages of mosquitoes; many infectious diseases are still diagnosed such as Dengue, Malaria and Acute Encephalitis Syndrome. The control of the aquatic developmental stages is one of the easiest way to prevent the emergence of adults-the blood feeding adult females being thus prevented to sample their blood meal and to lay their eggs in the aquatic milieu where develop the aquatic pre-imaginal developmental stages. Moreover, reducing the adult population size also the probability of for the blood feeding adult female mosquitoes to act as hosts and vectors of the arboviruses such as dengue virus & Japanese encephalitis virus as well as of Plasmodium. Several environmental factors including water quality parameters are responsible for the selection of oviposition sites by the female mosquitoes. In our study, larval densities of three important mosquitoes (Aedes/A. albopictus, Anopheles/An. stephensi and Culex/C. vishnui) were measured and water qualities of their habitat i.e. pH, Specific Conductance, Dissolved Oxygen, Chemical Oxygen Demand, Total alkalinity (T alk), Hardness, Nitrate nitrogen and Ammonia nitrogen were analyzed in 2017 and 2018 in many districts of West Bengal where humans beings are suffering from arboviruses and /or malaria. Whereas we have found positive correlation of density of C. vishnui and A. albopictus with the water factors except Chemical Oxygen Demand (COD) and T alk , for An. stephensi all these factors except pH, COD and T alk have positive correlation. Hardness of the water shows positive correlation with the density of An. stephensi and C. vishnui but negative correlation with density of A. albopictus. Contour plot analysis demonstrates that occurrence of each mosquito species lies in between specific range of water factors. Inter-correlation analysis revealed that mosquitoes were negatively correlated with each other. A positive correlation of the water quality parameters and larval density, over two successive years, was also noticed. In conclusion, the increasing level of pollution due to PLOS NEGLECTED TROPICAL DISEASES
SARS-CoV-2 or COVID-19, a new seventh human corona virus, has out-broken in Wuhan, China since 31... more SARS-CoV-2 or COVID-19, a new seventh human corona virus, has out-broken in Wuhan, China since 31st December 2019, and quickly escalated to take the form of pandemic which killed many human beings throughout almost all countries across continents. The rapidity of its transmission from human to human is far greater than all previous human corona viruses which came into existence like SARS-CoV, MERS-CoV, etc. The nucleotide sequence of SARS-CoV-2 (isolates Wuhan-Hu-1) is 29,875 bp in ss-RNA. Symptoms of SARS-CoV-2 infected pneumonia include from asymptomatic to high fever and/or respiratory illnesses. Coronavirus virion (spherical/round /elliptical in shape) consists of three parts- outer membrane or envelope, nucleocapsid and genome (RNA). SARS-CoV-2 was shown to use receptor, angiotensin converting enzyme 2 (ACE2) for attachment to the cells through its surface spike (S) protein (S1), and the virion enters into the host cell through two routes- direct membrane fusion and endocytotic...
Scientific Reports, 2019
Microfungal applications are increasing daily in the medical science. Several species of Trichode... more Microfungal applications are increasing daily in the medical science. Several species of Trichoderma are widely used in agricultural fields as biological control and plant growth promoting agents. The application of Trichoderma asperellum as an entomopathogenic fungus against the Anopheles mosquito, a vector of malaria, is a novel control approach. Controlling malaria with eco-friendly management practices is an urgent need. We isolated three T. asperellum from different natural sources using serial dilution and mosquito baiting techniques. The fungi were identified on the basis of phenotypical and molecular characteristics. The fungi were grown in different natural media to examine spore production ability and the fungal spore suspensions were applied to the anopheline larvae to determine their larvicidal activity in vitro. We investigated the efficacy of crude ME (methanolic extract) and different methanolic fractions (MFs) of the fungal extracts against anopheline larvae. Methano...
International Journal of Biological Macromolecules, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
International Journal of Biological Macromolecules, 2019
Undeniably drug delivery systems (DDSs) engaged take part in controlling the drug pharmacological... more Undeniably drug delivery systems (DDSs) engaged take part in controlling the drug pharmacological effect along with the pharmacokinetic profile with respect to the drug release rate, the site, bioavailability and then the sideeffect. Different procedures for visual medication conveyance have been reportedly considered; from fundamental strategies aimed at improving the accessibility of medications; consistency enhancers and mucoadhesives help sedate maintenance and entrance enhancers advance medication transport into the eye. The utilization of drug loaded CNC nanoengineered smart gels enabled medications can be better put where they are required for sustained release of the drugs with straightforward conveyance. Advancements in visual inserts give a way to conquer the physical obstructions that generally forestalled compelling treatment. Advancements are being worked on permitting long term tranquillized conveyance from solitary DDSs: these devices permit the release of the loaded drugs even up to 25 h. Future improvements could lead to the nanoengineering of CNC based drug loaded ODDS with excellent ophthalmic DDSs.
Carbohydrate polymers, Jan 15, 2018
Non-toxic nanocomposites based bio-films obtained from methylcellulose (MC) can reduce environmen... more Non-toxic nanocomposites based bio-films obtained from methylcellulose (MC) can reduce environmental problems associated with synthetic polymers. A new facile route for the isolation of cellulose nano-crystals (CNC) from jute waste is successfully utilized here. The fabrication of CNC reinforced MC nanocomposites by film casting technique and the studies of the effect of CNC on the properties of the MC based nanocomposites have been reported. The synthesized nanocomposites have shown improved UV resistance, mechanical, barrier, and thermal properties. FTIR results established the physicochemical compatibility between the drug, MC and CNC in nanocomposites. In vitro permeation studies performed by using Franz diffusion cell revealed diffusion mediated sustained drug release from the devices due to the presence of interaction between MC and CNC through H-bonding, electrostatic interaction between the hydrophilic polymer/CNC chains with the drug and the formation of tortuous path. The ...
A facile comparative approach towards utilization of waste cotton lint for the synthesis of nano-crystalline cellulose crystals along with acid recovery
International journal of biological macromolecules, Jan 20, 2017
There is a need for reuse of waste cotton lint (WCL) from the blow room of yarn spinning mills. T... more There is a need for reuse of waste cotton lint (WCL) from the blow room of yarn spinning mills. The drive to use this material for the synthesis of nanocellulose is difficult because of the several purification/pretreatment processes. Here, we developed a combined single bath purification process of WCL and utilized it for the synthesis of nano-crystalline cellulose crystals (NCs) which are valuable nanomaterials with novel properties along with acid recovery for reuse. The micrograph of the synthesized NCs confirmed a network of nano-sized crystalline cellulose crystals having nano ranged diameter of NCs isolated by two processes. The FTIR result established the removal of impurities and hemicelluloses from WCL. The crystallinity index of WCL (∼89.97%) is improved to ∼96% and ∼94% for sulphuric acid and nitric acid synthesized NCs (NC1 and NC2). The crystallite size of WCL, CTWCL, NC1, and NC2 was calculated using XRD and found to be 101.56, 103.54, 98.81, and 95.6nm respectively. ...
Designed Monomers and Polymers, 2016
Commercially used industrial baking enamels consist of alkyd or polyester resin with melamine for... more Commercially used industrial baking enamels consist of alkyd or polyester resin with melamine formaldehyde. These resins are mainly derived from fossil resources. Considering growing environmental legislation regarding use of petroleum based raw materials, utilization of renewable resources to synthesize various chemistries can be the only obvious option as far as academia and industries are concerns. The present work deals with exploration of one of the natural resources (Cardanol) for polyol synthesis, its characterization (FTIR and NMR) and its curing behavior with melamine formaldehyde resin by differential scanning calorimetry (DSC). The optimized formulations from DSC study were further evaluated for general coating properties to study the suitability of developed polyol for industrial coating application. The experimental studies revealed that melamine content in the curing mixtures and thereby developed crosslinking density played an important role in deciding the coatings properties.
International Journal of Research in Engineering and Technology, 2013
Geosynthetics made of man-made fibres, and used for addressing a host of geotechnical problems, h... more Geosynthetics made of man-made fibres, and used for addressing a host of geotechnical problems, have for the last two decades, registered a remarkable growth clinching about 95% share of the total global demand in several fields such as erosion control, management of slopes, strengthening of roads, stabilization of embankments, protection of river banks, consolidation of soft soils etc. One such major application of Geosynthetic material is in the field of road construction which has become an established phenomenon worldwide. Recently, however, increasing environmental concerns concomitant with the alarming danger of carbon footprint generation have generated interest in and led to acceptance of natural Jute Geotextile (JGT) where this material plays a significant role for the purpose of reinforcement providing dimensional stability as well as cushioning effect to the road surface thereby improving the life cycle as well as maintenance cost of the road. With the increasing use of Jute Geotextile worldwide in combating geotechnical problems without hampering environmental sustainability, and the confidence with which they are being used is also developing amongst engineers, manufacturers and end users is opening new avenues for potential Jute Geotextile. Hence, there is a dire need for quality control in terms of testing and evaluation of Jute Geotextile demanding formulation of new standards for testing. The existing test standards for synthetic Geotextiles for evaluating different end use property parameters are not uniform globally i.e., these test standards vary from country to country. However, in the field of standardization for testing of different properties of Jute Geotextiles there is a paucity of data for formulation of specifications and quality control guidelines. Test standards for synthetic Geotextiles understandably do not exactly apply to JGT. While study is on to develop exclusive test and design standard for JGT, there is need to adopt any of the existing standards for synthetic Geotextiles that cater to the majority of requirements in the interim period. The paper suggests adoption of ASTM standards for testing JGT because of the wide range of test standards available and their credibility.
AIP Advances, 2012
Through ab initio based density functional theory calculations, we have investigated the electron... more Through ab initio based density functional theory calculations, we have investigated the electronic structure, stability and non-linear optical properties of a series of nitrogen substituted fullerenes (azafullerenes) with the general formula C60-2nN2n (n=1–12). For each system, we have considered different possible isomers and the minimum energy isomer is subjected to further detailed investigations. We have calculated different properties such as HOMO-LUMO gaps, vertical ionization potentials, vertical electron affinities, etc. to verify the stability of the considered fullerenes. From the Hessian calculations, it is observed that all the fullerenes are not only associated with real vibrational frequencies, but the minimum frequencies are also found to be considerably large which further confirms the stability of the considered fullerenes. We find that the presence of unperturbed C6 rings enhances the stability of the fullerene whereas, the -N-C-N- fragments are found to destabili...
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Papers by Swapan Kumar Ghosh