
Rameshwar AdhikariTribhuvan University · Central Department of Chemistry
Rameshwar Adhikari
Ph. D., M. Sc. Chemistry
Polymers, fibers, blends, composites, nanomaterials
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Publications (263)
Flexible electronics are seamlessly integrated into our lives, from foldable displays to smart wearables, redefining our interaction with technology. The use of metals and semiconductors in these flexible devices is limited due to their poor bendability and stretchability. Consequently, integrating conjugated polymers (CPs) into a cellulosic framew...
The study aimed to investigate the effects of chitosan-based zinc oxide and silver nanoparticles coating on physicochemical properties of papaya and to optimize nanoparticles concentrations for extending its postharvest shelf life. The experiment was conducted in February, 2022 at the Institute of Agriculture and Animal Science (IAAS), Tribhuvan Un...
Medicinal plants are well-known for their bioactive compounds, with various parts possessing distinct medicinal properties. One such medicinal plant is Curcuma caesia Roxb., commonly known as Black turmeric, and is popular among ethnic groups in Nepal and India because of its diverse medicinal values. Researchers are exploring this hidden talent an...
This research investigated the incorporation of pine dust; a residual material from the furniture industry, into recycled high-density polyethylene (HDPE) to form a wood plastic composite (WPc) and analyzed how this integration affects the structure, mechanical properties, and water absorption of the resulting WPc. Here, after necessary required pr...
Wound management is a complex clinical challenge that needs advanced materials and techniques for satisfactory results. Electrospun nanofiber mats have emerged as an innovative alternative for wound healing purposes due to their porous architecture, greater surface area, ease of water absorption, mimicry of the extracellular matrix of natural tissu...
Cancer is an extremely challenging disease to cure. A normally functioning cell starts to proliferate uncontrollably and causes a whole set of problems ranging from pain, bleeding, fertility loss, functionality loss of organs, and eventually death. Conventional imaging modalities are unable to detect cancer at an early stage and have limitations li...
Electrical and electronic wastes (E-wastes) are complex waste and a new to the community. They are boon of new advanced technology serving the sophisticated society on the Earth; however, they are disaster from environmental point of view. E-waste is complex in its composition with small quantities of expensive metals such as Gold, Silver, Platinum...
Multiwalled carbon nanotubes (MWCNTs) at different concentrations, ranging from 0.5 to 10 wt%, as a conductive filler, were incorporated into poly(butylene adipate-co-terephthalate) (PBAT), a flexible biodegradable copolyester, via melt-mixing, followed by compression moulding. The electrical conductivity of the prepared nanocomposites was evaluate...
The thin film thermoelectric (TE) materials with higher values of the figure of merit are of special interest due to their promising applications. In this regard, metal oxide thin films are introducing flexible and stretchable devices, a type of next-generation electronic gadgets, and hence possess the potential for TE applications at high temperat...
This study investigated the activity concentrations of 226Ra, 232Th, and 40K and their soil-to-plant transfer factors in some medicinal plants located in Nepal. The geometric mean values of soil-to-plant transfer factors (TFs) for 226Ra, 232Th, and 40K were 0.37, 0.96, and 3.50, respectively. This indicated that medicinal plants absorbed the highes...
Kidney stone is an alarming global disease due to its rising incidence and prevalence. FTIR spectroscopic analysis reveals that calcium oxalate is one of the most frequent chemical constituents in kidney stones. DFT calculations indicate that the calcium oxalate can interact through charge transfer process in biological activities. Among various pr...
In recent years, microbial infections have emerged as a serious global health problem, necessitating the search for novel and effective treatments. Medicinal plants contain phytochemicals that can be used to prevent and treat various infections. Traditional medicinal practices have long relied on the healing properties of herbs, and Nepal is partic...
This paper has aimed to concisely discuss the insight into the potential of the Argeli bast fibers as reinforcing agents in eco-friendly polymer composites. The Argeli fibers used in this work as biofiller were prepared by mechanical disintegration of the sun-dried Argeli bast fiber bundles followed by chemical treatments and hence incorporated int...
The structure and some physicochemical properties of Argeli (Edgeworthia gardneri) bast fibers were investigated using Fourier Transform Infrared (FTIR) and Energy Dispersive X-ray (EDX) spectroscopies, Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The neat fibers were found to contain about 4.47% cellulose, 25.98% hemicellulose,...
Cellulose fibers were extracted from Sabai grass (Eulaliopsis binata) using mechanical and chemical treatments. The grass was ground to ~250 µm powder and bleached with hydrogen peroxide and acetic acid. The bleached fibers were treated with 6% sodium hydroxide solution and incorporated into resole resin at various weight percentages to prepare the...
The histone deacetylase 2 (HDAC2), an enzyme involved in gene regulation, is a potent drug target for the treatment of colon cancer. Phytocompounds having anticancer properties show the ability to interact with HDAC2 enzyme. Among the compounds, docking scores of caffeic acid (CA) and p-coumaric acid (pCA) with HDAC2 showed good binding efficacy of...
The IUPAC Subcommittee on Polymer Education has been pursuing the development of a compact syllabus covering the essential topics required for a tertiary education in polymer science, with numerical and short answer exercises addressing each topic. The primary goal of the document is to provide a framework for a complete course made freely availabl...
This study aimed to investigate the antifungal activity of seeds of Abrus precatorius L., Datura metel L. and Diploknema butyracea (Roxb.) H.J. Lam against common phytopathogenic fungi. The powdered seeds were extracted by Soxhlet extraction method using methanol as a solvent. Antifungal activity was performed by poison agar technique with differen...
Lactoferrin, a member of the transferrin family, is one of the promoter proteins for calcium oxalate-type kidney stone formation. It exhibits a remarkable ability to interact with metals and oxalate ions. The prevalence of calcium oxalate in kidney stones was confirmed by the Fourier transform infrared spectra. The quantum chemical properties of ca...
With a fast-rising population, the amplification of new resources, skills, and devices that can provide safe potable water and clean energy remains one of the vital research prominences for the scientific community. Owing to this, new materials with graphene functionalized derivatives show significant improvement for multifunctional catalysis and a...
Crinis Carbonisatus, prepared by pyrolysis of human hair, is known as a traditional Chinese medicine used for increasing blood clotting and wound healing. Its uses have been explored in literature but no detailed structural study is yet reported. This work is aimed at studying the chemical and morphological variation of Crinis Carbonisatus under gi...
Wheat stalk (W), Fosro (F), Nigalo with waxy layer (NW), and Nigalo without waxy layer (NWo) were used to extract microcrystalline cellulose (MCC), the xMCC (where x represents origin such as W, F, NW, and NWo) by thermochemical and mechanical treatments. About 10 wt% of xMCC and commercial MCC (C-MCC) were solution casted with ethylene oxide-epich...
The emergence of new variants of the novel coronavirus SARS-CoV-2 with increased infectivity, superior virulence, high transmissibility, and unmatched immune escape has demonstrated the adaptability and evolutionary fitness of the virus. The subject of relative order of the binding affinity of SARS-CoV-2 variants with the human ACE2 (hACE2) recepto...
Hydroxyapatite (HAp), a calcium phosphate-based bio-ceramic, was prepared from waste ostrich bone using the thermal decomposition method, and the nano-HAp was segregated by the water-in-oil microemulsion technique. A single acute dose of oral toxicity of nano-HAp in gelatin suspension was tested in eleven female Albino Wistar rats following the OEC...
Iridoids commonly found in plants as secondary metabolites have been reported to possess significant biological activities such as anticancer, antioxidant, hypoglycemic, antimicrobial etc. The strong interactions of iridoids with cyclic-dependent kinase 8 (CDK8) protein could show inhibitory effects that could modulate tumour growth. From the molec...
This paper has been accepted in NJST_Vol 21(2), already peer reviewed. This paper mainly deals about status and human behaviour with E-waste in Nepal.
A biodegradable polymer, the poly(butylene adipate co ‐terephthalate) (PBAT), was compounded with the microcrystalline cellulose (MCC) obtained from different sources (such as wheat stalk and rice husk powder) to prepare the polymer composites. The two components, here found to be compatible, as evidenced by the Fourier transform infrared (FTIR) sp...
Electrical and electronic wastes (E-wastes) are complex waste and a new to the community. They are boon of new advanced technology serving the sophisticated society on the Earth; however, they are disaster from environmental point of view. E-waste is complex in its composition with small quantities of expensive metals such as Gold, Silver, Platinum...
The current study involved the determination of water quality parameters, inclusively the dissolved mineral levels, to assess the therapeutic and toxicity states of the hot spring water of Kharapani, Pokhara, Nepal. People have widely used the hot spring for taking baths and soaking in to heal from allergic and fungal ailments, musculoskeletal diso...
Introduction. Group B streptococci (GBS) are globally recognized as one of the leading causes of neonatal sepsis and meningitis and is also known to cause adverse pregnancy outcomes such as stillbirths and miscarriages. us, detailed investigation of GBS in pregnant women has special significance in public health related researches. Objectives. e pr...
The structural, thermal and surface-wetting properties of epoxy resin/multiwalled carbon nanotubes (EP/MWCNTs) composites were studied by preparing nanocomposites by the physical mixing assisted by ultrasonication. The materials were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and thermogravimetric anal...
Chitin obtained after demineralization and deproteinization of pulverized crab shells was deacetylated in strictly alkaline medium of caustic soda to yield high molecular weight nano-crystalline crab-shell chitosan (HMWNC) with Mw of 350 kDa, 71% DDA, particle size of 76 nm, 7.4% moisture content and 1% ash content. The current work involved encaps...
MXene-based multicomponent materials are 2D substances derived from transition metal (M) with carbide/nitride combinations having several propitious uses, including application in energy storage devices for high-performance electrodes for Lithium-ion batteries (LIBs) fabrication. The suitability of these new classes of materials for LIB electrodes...
Summarization has remained as an old idea of representing and expressing important facts and ideas in a shorter format without distorting the main context of the content at which they appear. The problem of summarization remains a challenging one, the text data varies with varying language and thus, the meaning and the context at which the words ap...
Proteins (natural polymers) consist of highly complex groups of macromolecules comprising amino acid residues connected by peptide bonds. A protein contains at least one linear long chain of amino acid residues called a polypeptide. Biochemists generally divide proteins into four kinds by structure: primary, secondary, tertiary, and quaternary [1]....
Cancer, a leading cause of human fatalities accounts for nearly one out of six deaths globally. • A class of organic compounds, iridoids, commonly found in plants as secondary metabolites has been reported to possess biological activity and could be used as antineoplastic drugs as well as a potential compound to form conjugates with other antineopl...
Poly(butylene adipate‐co‐terephthalate) (PBAT), a biodegradable copolyester, was used as the polymer matrix to prepare nanocomposites with multiwalled carbon nanotubes (MWCNT) by melt‐mixing followed by hot‐pressing. The PBAT/MWCNT nanocomposites were exposed to electron beam (EB) irradiation, and thermal stability, melting and crystallization beha...
Clean and drinkable water is a big challenge in 21st century. A variety of organometallic compounds have been utilized by human being for rapid civilization and modernization. These hazardous waste discharges from the industries and directly mixed with environment especially in water reservoir and adulterate water, which is responsible for many con...
Platinum nanoparticles (Pt NPs) have numerous applications in various sectors, including pharmacology, nanomedicine, cancer therapy, radiotherapy, biotechnology and environment mitigation like removal of toxic metals from wastewater, photocatalytic degradation toxic compounds, adsorption, and water splitting. The multifaceted applications of Pt NPs...
In South Asia, a fruit often known as Bael is a valuable medicinal plant, which is scientifically named Aegle marmelos. Not just the fruits but also the leaves, stems, bark, and roots are used in traditional medicine. Since ancient times, the plant has been used to treat a variety of chronic illnesses. Several scientific investigations have confirm...
In the present work, a new testing strategy was proposed to characterize the effect of a functional group on the interaction between rubber and filler in a rubber compound. In principle, the filler is mixed into a blend of rubber A and rubber B produced by functionalizing the rubber A with a specific chemical group. The phase-selective wetting of t...
Cadmium sulfidenanoparticles (CdSNPs) were prepared through the chemical precipitation process where sweet potato starch and glucose-functioned as capping agents. Ultraviolet-Visible (UV-Vis) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and X-ray diffraction (XRD) techniques were applied for the analysis of prepared CdSNPs. The abso...
Computational chemistry is a field of current active research in science that can supplement and complement the regular experimental methods and validate or propose new theoretical formulations. It has contributed from basic to advanced levels of investigation in a synergistic manner. The mathematical experiments can be pursued with minimal resourc...
The electrically conducting composite paper is prepared by incorporating the cellulosic pulp extracted mechano‐chemically from a bamboo species, Arundinaria falcata , locally called Nigalo , with different amounts of multi‐walled carbon nanotubes (MWCNTs). The raw and processed fibers as well as the composite papers with MWCNTs are examined with Fo...
Is report, the extraction process for highly nanocrystalline hydroxyapatite (HAp) by thermal decomposition of the femur bone of buffalo and its utilization as filler to produce nanocomposite with poly(butylene adipate-co-terephthalate) (PBAT). Advanced analytical techniques (such as X-ray diffraction [XRD], Fourier transform infrared [FTIR] spectro...
Technological advancementalways seeks new materials with improved functional properties, particularly for smart applications. In this regard, nanotechnology is offering today wide range of novel material designs fabricated by compounding nanofillers into the polymer matrix. Different allotropic forms of carbon can reinforce the properties of polyme...
The synthesis and characterization of two new Schiff base ligands containing 1,2,4-triazole moieties and their oxovanadium(IV) complexes have been reported. The ligands and their complexes were studied by ultraviolet-visible (UV-Vis), Fourier transform infrared (FTIR), proton nuclear magnetic resonance (1H NMR), electron paramagnetic resonance (EPR...
ZnCO3 nanoparticles (NPs) were prepared by the direct precipitation method using zinc nitrate hexahydrate (Zn(NO3)2.6H2O) and ammonium carbonate ((NH4)2CO3) as precursor materials and polyvinyl alcohol (PVA) as capping agent (R1) whereas ZnO NPs were prepared by thermal decarbonation of the prepared ZnCO3 NPs in the absence (R2) and the presence (R...
According to a recent survey, Nepal's urban air quality has been classified as one of the worst in the globe. A large portion of the country's population is subjected to health risks caused by air pollution. As Nepal has a wide variation in altitude coupled with socio-cultural and biological diversities, it is important to understand the different...
The application of cold plasma therapy for the treatment of cancer is one promising field of study. This therapy can target and kill cancer cells while sparing healthy cells. The reactive oxygen species (ROS) and reactive nitrogen species (RNS), produced during plasma treatment is responsible for the cancer cells death. The research on cold plasma...
In this study, decellularized fish skin (DFS) scaffold decorated with silver nanoparticles was prepared for accelerating burn wound healing. The silver nanoparticles (AgNPs) synthesized by the green and facile method using Aloe vera leaf at different incubating times were characterized by using X-ray Diffraction (XRD), Fourier Transform Infrared (F...
For the investigations, scaffolds for bone regeneration (in the form of non-woven mats) were fabricated based on a polymer blend based on polycaprolactone, poly-L-lactic acid and gelatin by electrospinning which were partly modified using vitamin D3 and reinforced with 0 – 12 % nano-hydroxyapatite (nano-HAp extracted from ostrich bones) to improve...
Multi-walled carbon nanotubes and graphite nanoplatelets were functionalized via acid treatment to overcome the problem of agglomeration. Fourier transform infrared spectroscopy showed the chemical modification of the nanocarbons while the general relationship between the chemical treatment and the defects population was analyzed by Raman spectrosc...
Today there is a growing trend of using natural, biogenic or environment friendly materials to meet the ever increasing demand of the world population for their desire on high performance materials for construction, transportation, electronic and electrical appliances as well as in environmental remediation and health care products including lifesa...
Polymer modification by using highly energetic radiations such as gamma rays and the electron beam is a relatively well-established area of research and development. These radiations have been utilized for upgrading the performance of polymeric materials by introducing various architectural modifications and functionalities in the macromolecular ch...
In recent years, considerable attention is given in various nanomaterials development using biodegradable wastes for establishing more eco-friendly technologies. Due to the biocompatible, biodegradable, and non-toxic nature hydroxyapatite (HAp) and chitosan (CS) are highly studied in recent times. In this research work, HAp and CS were synthesized...
Bhasmas are prepared from metallic and herbal ingredients and are also referred to as herbo-metallic preparations. Lauha bhasma (LB) is one of the iron-based herbo-metallic preparations used in Ayurvedic medicine for treating various ailments due to iron deficiency. The preparation of LB involves normal purification (samanya sodhana), special purif...
The unbalanced lifestyle and rampant use of modern medicine are the leading causes of life-threatening cancer disease prevalence. In the last few decades, chemotherapy and other medication techniques promised to cure cancer. However, cold plasma on cancer cell lines gets little attention due to a lack of understanding of the detailed mechanism of a...
Structural, mechanical, thermal and surface properties comprising biodegradable aromatic–aliphatic polymer poly(butylene adipate-co-terephthalate) (PBAT) and the wheat stalk-based nanocellulose (NCC) were studied. The materials were found to comprise the compatible and yet phase-segregated constituents which kept their identity in the nanocomposite...
Having its root lying in microelectronics, microfluidics seems to hold great potential to explore people's limited knowledge in the field of oncology. It offers numerous advantages such as a low sample volume, minimal cost, parallelization, and portability and has been advanced in the field of molecular biology and chemical synthesis. The platform...
Taking the life of nearly 10 million people annually, cancer has become one of the major causes of mortality worldwide and a hot topic for researchers to find innovative approaches to demystify the disease and drug development. Having its root lying in microelectronics, microfluidics seems to hold great potential to explore our limited knowledge in...
Background
The pandemic of Coronavirus Disease 2019 (COVID-19), one of the most infectious diseases in the modern history, is caused by Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) and has had a profound health and economic toll, globally. This paper identifies the overall health status associated with COVID-19 pandemic in all 7 pro...