Ajaya Bhattarai

• B.Sc., M.Sc., Phd, Post Doctorate
• Professor at Tribhuvan University

Precise measurements on the electrical conductivity of sodium polystyrenesulfonate in acetonitrile–water-mixed solvent media containing 20 and 40vol.% of acetonitrile at 308.15, 313.15, and 318.15K are reported. The mobility of the polyelectrolyte solute was found to be influenced by the polyelectrolyte concentration, the relative permittivity of t...

Precise measurements on the electrical conductivity of solutions of sodium polystyrenesulphonate in methanol–water mixed solvent media containing 8, 16, 25, and 34 wt.% of methanol at 308.15, 313.15, 318.15, and 323.15K are reported. The degree of substitution of sodium polystyrenesulphonate used was 1, and the concentrations were varied from ∼2.0...

Precise measurements on the viscosities of the solutions of sodium carboxymethylcellulose in water and in two acetonitrile–water mixtures containing 10 and 20 vol % of acetonitrile have been reported at 35, 40 and 50 °C. Isoionic dilutions were performed with the total ionic strengths of the solutions maintained with sodium chloride at ∼4.20 × 10−4...

Precise measurements on the density of sodium lauryl sulfate in pure water and in methanol (1) + water (2) mixed solvent media containing (0.10, 0.20, 0.30, and 0.40) volume fractions of methanol at (298.15, 308.15, 318.15, and 323.15) K are reported. The concentrations are varied from (0.3·10–1 to 1.3·10–1) mol·kg–1. The results were almost consta...

The observed asymmetric behaviour of mixing properties of AlMg liquid alloys around equiatomic composition with smaller negative values for excess free energy of mixing (−0.15kJmol−1) has aroused our interest to undertake a theoretical investigation of this system.A simple statistical mechanical theory based on compound formation model (μA+νB⇌AμBν)...

Mol­ecules of the title compounds, methyl (Z)-2-(4-bromo­phen­yl)-2-[2-(4-methyl­phen­yl)hydrazin-1-yl­idene]acetate, C16H15BrN2O2, (1), methyl (Z)-2-(4-bromo­phen­yl)-2-[2-(3,5-di­methyl­phen­yl)hydrazin-1-yl­idene]acetate, C17H17BrN2O2, (2), methyl (Z)-2-[2-(4-meth­oxy­phen­yl)hydrazin-1-yl­idene]-2-(3-nitro­phen­yl)acetate, C16H15N3O5, (3), and...

Silver nanoparticles (AgNPs) were synthesized using an environmentally friendly, biosynthetic approach. The aqueous leaf extract of Hyoscyamus muticus, employed for the first time in this capacity, served as a capping ligand for AgNPs formation. To enhance the reducing capability of the extract, sodium borohydride (NaBH4) was added. The synthesized...

Micellization behaviour, thermodynamics and dye–surfactant interactions are the main topics of this investigation into the relationship between Remalan Brilliant Blue R (RBBR) dye and n-alkyltrimethylammonium chloride (CnTAC; n = 12, 14, 16 and 18) surfactants. Conductometric analysis revealed that the critical micelle concentration decreased with...

Turmeric is a spice obtained by drying and grinding the rhizomes of the plant Curcuma longa. Turmeric is a key component of traditional Ayurvedic medicine which is also one of the basic and most widely used spice in regular cooking. It has an active component curcumin. Due to its increasing popularity, turmeric is found to be adulterated with the s...

This study investigates the effects of 2-Propanol (2-PrOH) on the surface and wetting properties of anionic - Sodium bis(2-ethyl hexyl) sulfosuccinate, also known as Aerosol AT (AOT), Sodium Dodecyl Sulfate (SDS) – and cationic – Cetylpyridinium Chloride (CPC) and Cetyltrimethylammonium Bromide (CTAB) surfactants on a glass surface. Key surface pro...

Datura Stramonium is an indigenous plant in Nepal but is globally cultivated for its wide medicinal applications. The knowledge of the surface properties of leaves and wettability conditions is essential for foliar applications to protect the plants. The wettability of the leaf surface is characterized by the contact angle (CA) measurement, and sur...

This study investigates the influence of acetone on the physicochemical characteristics of surfactants, focusing on surface tension, viscosity, and micellization behavior in acetone-water mixtures. The critical micelle concentration (CMC) of Sodium dodecyl sulfate (SDS) and Cetyltrimethylammonium bromide (CTAB) increases with acetone content, refle...

The asymmetric unit of the title com­pound, C23H19NO2S, contains two mol­ecules that differ in the conformation of the two carb­ox­amide moieties. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains propagating parallel to the c-axis direction. Between the mol­ecules, weak C—H⋯π(ring) inter­actions are present, wher...

Interfacial phenomena such as wetting can be enhanced to a greater extent and mixed surfactant systems are promising candidates for the improvement of wettability of hydrophobic surfaces. In this study, the investigation sought to examine the surface-wetting characteristics of mild steel utilizing a blend of the cationic surfactant cetylpyridinium...

This study investigates the effects of 10 % v/v dimethyl sulfoxide (DMSO), acetonitrile (ACN), and 1-propanol (1-PrOH) on the micellar and surface behavior of three ionic surfactants: sodiumdodecyl sulfate (SDS), dodecyltrimethylammonium bromide (DTAB), and cetylpyridinium chloride (CPC). The addition of co-solvents increased the critical micelle c...

This article aims to promote army spirituality as a means of fostering peace. In order to do this, the study's fundamental methodology examines the many current events using literary references and the most recent conflict between Israel and the Palestinians, as well as between Ukraine and Russia. A conflict between groups of people who wish to sha...

Women have faced a variety of challenges. In addressing gender disparity, women have empowered themselves and encouraged society to pay attention to the issue. A women-friendly organizational culture must be created by Nepal's government; organizations must be designed with women in mind. Employees who are women are more committed to their organiza...

In this study, carbon nanoparticles (CNPs) were made from mustard oil using the principles of green chemistry. Green chemistry employs a low-cost, straightforward combustion method that eliminates the need for potentially dangerous components. The characterization techniques used in this study were Fourier Transform Infrared (FTIR) Spectroscopy and...

Gold Nanoparticles (AuNPs) stabilized by phosphine derivatives provide extensive uses such as sensing, catalysis, and innovative therapeutic methods including biological imaging and immunoassays. In this research, phosphine oxide derivative ligands...

The generation and collection of heavy metals in wastewater are increasing due to rapid overpopulation, urbanization, and industrialization. Thus, it is critical to manage and treat the wastewater released from industries, cities, and agricultural sites, before discharging them into the drainage system. This research paper investigated the contamin...

Tinospora cordifolia and Senna alata are well-known medicinal plants recognized for their extensive antibacterial, antifungal, and therapeutic applications. In addition to their well-established medicinal values they show great promise as eco-friendly corrosion inhibitors. In this study, plant extracts from Tinospora cordifolia and Senna alata were...

This article reviews on the origination and development of soaps (later called surfactants) and their applications in human civilization. It was reviewed that soaps were came in use in human life as earlier as 2200 BC in Babylon. In ancient time, soaps were prepared using tallow and ashes in most of the region of world, and in similar way China beg...

The main difficulties and problems with the examination system in Nepal's Madhesh Province are attempted to be brought up in this article. The entire educational system, including the curriculum, lecturers, instructional materials, and methodology, is intimately related to the examination system.The paper makes a strong case that the dualistic educ...

Corrosion is the spontaneous chemical or electrochemical reaction of metal with its surrounding environment. There have been ongoing worries about how corrosion affects the strength and stability of metal surfaces. Chemical corrosion inhibitors are often used in manufacturing and processing activities to prevent the deterioration of materials. Surf...

In this study, we explore the phytochemical components of Aglaomorpha propinqua, a plant of the Polypodiaceae family, and their potential antibacterial effects on various pathogenic bacteria. Plant rhizomes from lithophytic and epiphytic habitats were selected for extraction using ethanol and water as solvents. The soxhlet method yielded 30.37% and...

Thermodynamic behavior of dodecyltrimethylammonium bromide (DTAB) in sodium carboxymethyl cellulose (NaCMC) solution with and without methyl orange (MO) dye in the ethanol–water mixture (0, 0.1, 0.2, and 0.3) volume fractions of ethanol at different temperatures by conductivity measurements is studied. The obtained conductivity data suggests that t...

Lapsi (Choerospondias axillaris (Roxb.) B.L.Burtt & A.W.Hill) is an useful medicinal plant known for various bioactive compounds and diverse biological activities. The aim of this article was to comprehensively review the available information about the traditional uses, chemical constituents and biological activities of Lapsi. A comprehensive lite...

This study investigates the concentration of heavy metal ions in wastewater samples collected from various industrial facilities located in the Biratnagar-Rangeli corridor of Morang district. The physical and chemical parameters, such as pH, electrical conductivity (EC), biological oxygen demand (BOD), and chemical oxygen demand (COD) were measured...

Conventional physical and chemical methods for synthesizing silver nanoparticles (AgNPs) often use reducing agents, and other chemicals that are harmful to the environment because of their toxic properties. This has prompted significant concern and the need to develop environmentally acceptable approaches. Due to the constraints of traditional chem...

Herein, we report the synthesis of an (E)‐N‐(pyridine‐3‐ylmethylene)pyridine‐2‐amine Schiff base (ENppa) and its Cu (II) complex (Cu‐ENppa) using 2‐aminopyridine (2APy) and pyridine‐3‐carbaldehyde (P3C). This study aimed to investigate the ADMET profiles, electronic features, antibacterial and anticorrosion activities of the synthesized ligand, and...

This study presents the synthesis, characterization and Hirshfeld surface analysis of 1-[6-bromo-2-(3-bromo­phen­yl)-1,2,3,4-tetra­hydro­quinolin-4-yl]pyrrolidin-2-one, C19H18Br2N2O. In the title compound, the pyrrolidine ring adopts a distorted envelope configuration. In the crystal, mol­ecules are linked by inter­molecular N—H⋯O, C—H⋯O and C—H⋯Br...

The study of the interaction between aspartic acid (Asp) and cetyltrimethylammonium bromide (CTAB) reveals important information about surfactant organization, surface tension, critical micelle concentration (CMC), and surface pressure. Because of enhanced surfactant solubility brought about by electrostatic interactions, Asp’s ionization lowers CT...

The Dynamic Light Scattering (DLS) measurements have been performed on quercetin with dioctyl sodium sulfosuccinate (Aerosol OT, AOT), Triton X-100 in 1,4-dioxane, as well as on the solutions containing water in the core of suitable reversed micelles; the water amount was calculated using the relation R = [H 2 O]/[surfactant], defining the ratio of...

The dinuclear mol­ecule of the title compound, [Mo2(C9H13)2(CO)6] or [Mo(tBuCp)(CO)3]2 where tBu and Cp are tert-butyl and cyclo­penta­dienyl, is centrosymmetric and is characterized by an Mo—Mo bond length of 3.2323 (3) Å. Imposed by inversion symmetry, the tBuCp and the carbonyl ligands are in a transoid arrangement to each other. In the crystal,...

The title compound, bis­[di­thio­bis­(formamidinium)] hexa­bromido­ruthenium dibromide trihydrate, [(NH2)2CSSC(NH2)2]2[RuBr6]Br2·3H2O, crystallizes in the ortho­rhom­bic system, space group Cmcm, Z = 4. The [RuBr6]²⁻ anionic complex has an octa­hedral structure. The Ru—Br distances fall in the range 2.4779 (4)–2.4890 (4) Å. The S—S and C—S distance...

In the title compound, C19H18BrFN2O, the pyrrolidine ring adopts an envelope conformation. In the crystal, mol­ecules are linked by inter­molecular N—H⋯O, C—H⋯O, C—H⋯F and C—H⋯Br hydrogen bonds, forming a three-dimensional network. In addition, C—H⋯π inter­actions connect mol­ecules into ribbons along the b-axis direction, consolidating the mol­ecu...

The stereoselective synthesis of biobased nonionic sugar surfactants (polyhydroxy surfactants), which are thought to be safer, more affordable, plentiful, biodegradable, biocompatible, and possess mildness and performance in formulation, is becoming increasingly popular as people become more aware of the potential negative effects of conventional s...

This research aims to comprehensively investigate and analyze the UV–visible spectroscopic behavior of the methyl red (MR)-cetyltrimethylammonium bromide (CTAB) system under the influence of sodium polystyrene sulfonate (NaPSS) in aqueous and different volume fractions (v.f.) of ethanol (EtOH)–H2O (0.1, 0.2, and 0.3) at 298.15 ± 0.2 K. In EtOH–H2O...

In the title compound, C19H17NO5S, the cyclo­hexene ring adopts nearly an envelope conformation. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds, forming a three-dimensional network. In addition, C—H⋯π inter­actions connect the mol­ecules by forming layers parallel to the (010) plane. According to the Hirshfeld surface analysis, H⋯H (...

Introduction Researchers are increasingly favouring the use of biological resources in the synthesis of metallic nanoparticles. This synthesis process is quick and affordable. The current study examined the antibacterial and anticancer effects of silver nanoparticles (AgNPs) derived from the Neurada procumbens plant. Biomolecules derived from natur...

The title mol­ecule, C18H26O4, consists of two symmetrical halves related by the inversion centre at the mid-point of the central –C—C– bond. The hexene ring adopts an envelope conformation. In the crystal, the mol­ecules are connected into dimers by C—H⋯O hydrogen bonds with R ² 2(8) ring motifs, forming zigzag ribbons along the b-axis direction....

In the title compound, C6H4BrF3N4O2, the oxa­diazole ring is essentially planar with a maximum deviation of 0.003 (2) Å. In the crystal, mol­ecular pairs are connected by N—H⋯N hydrogen bonds, forming dimers with an R ² 2(8) motif. The dimers are linked into layers parallel to the (10 ) plane by N—H⋯O hydrogen bonds. In addition, C—O⋯π and C—Br⋯π i...

In the title compound, C15H13NO3S, the mol­ecular conformation is stable with the intra­molecular O—H⋯O hydrogen bond forming a S(7) ring motif. In the crystal, mol­ecules are connected by C—H⋯O hydrogen bonds, forming C(8) chains running along the a-axis direction. Cohesion of the packing is provided by weak van der Waals inter­actions between the...

Supporting information: this article has supporting information at journals.iucr.org/e Published under a CC BY 4.0 licence Crystal structure and Hirshfeld surface analysis of 6-imino-8-(4-methylphenyl)-1,3,4,6-tetrahydro-2H-pyrido[1,2-a]pyrimidine-7,9-dicarbonitrile In the ten-membered 1,3,4,6-tetrahydro-2H-pyrido[1,2-a]pyrimidine ring system of th...

The corrosion inhibition behavior of cetyl pyridinium chloride (CPC) on mild steel (MS) in 0.5 M H2SO4 solution was examined using the weight loss method and potentiodynamic polarization method. The experimented MS surface was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), and A...

In the title compound, C24H21NO3S, the cyclopentene ring adopts an envelope conformation. In the crystal, mol­ecules are linked by C—H⋯π inter­actions, forming ribbons along the a axis. Inter­molecular C—H⋯O hydrogen bonds connect these ribbons to each other, forming layers parallel to the (0 1) plane. The mol­ecular packing is strengthened by van...

To be used in cutting-edge green and other technologies, rare earth elements (REEs) are in great demand. Rare earth elements (REEs) include the following elements: La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; additionally, they include Sc. Computers, laptops, TVs, generators, DVD players, cell phones, refrigerators, and other ele...

Groundwater is a major source of drinking water for millions of people across the globe. Most of these sources are reported to contain elevated levels of arsenic. Human health and ecosystems are adversely affected by arsenic-contaminated drinking water. So, arsenic-contaminated groundwater has become a major global health concern. This paper review...

The asymmetric unit of the title compound, C25H18N6·H2O, comproses two mol­ecules (I and II), together with a water mol­ecule. The terminal phenyl groups attached to the methyl groups of the mol­ecules I and II do not overlap completely, but are approximately perpendicular. In the crystal, the mol­ecules are connected by N—H⋯N, C—H⋯N, O—H⋯N and N—H...

In the title compound, C20H17BrO5S, mol­ecules are connected by inter­molecular C—H⋯S hydrogen bonds with R ² 2(10) ring motifs, forming ribbons along the b-axis direction. C—H⋯π inter­actions consolidate the ribbon structure while van der Waals forces between the ribbons ensure the cohesion of the crystal structure. According to a Hirshfeld surfac...

The asymmetric unit of the title compound, 2C31H28N2O4S·C2H6O, contains a parent mol­ecule and a half mol­ecule of ethanol solvent. The main compound stabilizes its mol­ecular conformation by forming a ring with an R 1 ²(7) motif with the ethanol solvent mol­ecule. In the crystal, mol­ecules are connected by C—H⋯O and O—H⋯O hydrogen bonds, forming...

The current economic development paradigm, which is based on steadily rising resource consumption and pollution emissions, is no longer viable in a world with limited resources and ecological capacity. The “green economy” idea has presented this context with a chance to alter how society handles the interplay between the environmental and economic...

In the ten-membered 1,3,4,6-tetra­hydro-2H-pyrido[1,2-a]pyrimidine ring system of the title compound, C17H15N5, the 1,2-di­hydro­pyridine ring is essentially planar (r.m.s. deviation = 0.001 Å), while the 1,3-diazinane ring has a distorted twist-boat conformation. In the crystal, mol­ecules are linked by N—H⋯N and C—H⋯N hydrogen bonds, forming a th...

Oxidation of oxacillin, a penicillanic acid derivative, has been predicted by monoperiodatocuprate [MPC (III)] at 25°C with 0.10 mol dm-3 ionic strength, in an aqueous alkaline medium by UV/Visible spectrophotometric analysis, for which 1:4 stoichiometry of oxacillin: MPC (III) is visible. The appearance of a sharp peak by the spectrophotometer con...

The precise measurements of petrol interfacial tension (IFT) in the presence of Sodium dodecyl sulphate (SDS) at room temperature by Mansingh Survismeter are reported. The concentration of sodium dodecyl sulphate was varied from above and below the critical micelle concentration (CMC) to cover the minimum and maximum concentrations of the investiga...

In the title compound, C21H15N5OS2, mol­ecular pairs are linked by N—H⋯N hydrogen bonds along the c-axis direction and C—H⋯S and C—H⋯O hydrogen bonds along the b-axis direction, with R²2(12) and R²2(16) motifs, respectively, thus forming layers parallel to the (10) plane. In addition, C=S⋯π and C≡N⋯π inter­actions between the layers ensure crystal...

The crystal structures and Hirshfeld surface analyses of three similar compounds are reported. Methyl 4-[4-(di­fluoro­meth­oxy)phen­yl]-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexa­hydro­quinoline-3-carboxyl­ate, (C21H23F2NO4), (I), crystallizes in the monoclinic space group C2/c with Z = 8, while isopropyl 4-[4-(di­fluoro­meth­oxy)phen­yl]-2,6,6-trimeth...

In the crystal of the title compound, C6H9ClN2O, mol­ecular pairs form dimers with an R ² 2(8) motif through N—H⋯O hydrogen bonds. These dimers are connect into ribbons parallel to the (100) plane with R ⁴ 4(10) motifs by N—H⋯O hydrogen bonds along the c-axis direction. In addition, π–π [centroid-to-centroid distance = 3.4635 (9) Å] and C—Cl⋯π inte...

The title com­pound, C13H11NO, adopts an E configuration about the C=C double bond. The pyrrole ring is inclined to the phenyl ring at an angle of 44.94 (8)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming ribbons parallel to (020) in zigzag C(7) chains along the a axis. These ribbons are connected via C—H⋯π inter­actions, f...

The crystal structures and Hirshfeld surface analyses of three similar azo compounds are reported. Methyl 4-{2,2-di­chloro-1-[(E)-phenyl­diazen­yl]ethen­yl}benzoate, C16H12Cl2N2O2, (I), and methyl 4-{2,2-di­chloro-1-[(E)-(4-methyl­phen­yl)diazen­yl]ethen­yl}benzoate, C17H14Cl2N2O2, (II), crystallize in the space group P21/c with Z = 4, and methyl 4...

The current economic development paradigm, which is based on steadily rising resource consumption and pollution emissions, is no longer viable in a world with limited resources and ecological capacity. The "green economy" idea has presented this context with a chance to alter how society handles the interplay between the environmental and economic...

In the title compound, C10H8N4O3·C3H7NO, the asymmetric unit contains two crystallographically independent mol­ecules A and B, each of which has one DMF solvate mol­ecule. Mol­ecules A and B both feature intra­molecular N—H⋯O hydrogen bonds, forming S(6) ring motifs and consolidating the mol­ecular configuration. In the crystal, N—H⋯O and O—H⋯O hyd...

The title compound, [RuCl2(C33H43N3O)], is an example of a new generation of N,N-dialkyl ruthenium catalysts with an N—Ru coordination bond as part of a six-membered chelate ring. The Ru atom has an Addison τ parameter of 0.244, which indicates a geometry inter­mediate between square-based pyramidal and trigonal–bipyramidal. The complex shows the u...

In the title compound, C18H22O7, two hexane rings and an oxane ring are fused together. The two hexane rings tend toward a distorted boat conformation, while the tetra­hydro­furan and di­hydro­furan rings adopt envelope conformations. The oxane ring is puckered. The crystal structure features C—H⋯O hydrogen bonds, which link the mol­ecules into a t...

In the title compound, C25H25NO7S, the mol­ecular conformation is stabilized by intra­molecular O—H⋯O and N—H⋯O hydrogen bonds, which form S(6) and S(8) ring motifs, respectively. The mol­ecules are bent at the S atom with a C—SO2—NH—C torsion angle of −70.86 (11)°. In the crystal, mol­ecules are linked by C—H⋯O and N—H⋯O hydrogen bonds, forming mo...

In the title compound, C20H18N2S, the asymmetric unit comprises two similar mol­ecules (A and B). In mol­ecule A, the central thio­phene ring makes dihedral angles of 89.96 (12) and 57.39 (13)° with the 1H-pyrrole rings, which are bent at 83.22 (14)° relative to each other, and makes an angle of 85.98 (11)° with the phenyl ring. In mol­ecule B, the...

In the crystal of the title compound, C 6 H 9 ClN 2 O, molecular pairs form dimers with an R 2 2 (8) motif through N-H� � �O hydrogen bonds. These dimers are connect into ribbons parallel to the (100) plane with R 4 4 (10) motifs by N-H� � �O hydrogen bonds along the c-axis direction. In addition, �-� [centroid-to-centroid distance = 3.4635 (9) Å ]...