ravi kumar Cheedarala

Ulsan National Institute of Science and Technology | UNIST · Department of Advanced Chemical Engineering

The secondary and tertiary alcohols of terpenes were synthesized from aldehydes, and ketones using allyl magnesium chloride by the continuous metal flow reactor method. The flow process was conducted using metal plate reactors of 10 ml capacity in the presence of solvent mixtures, instead of large amounts of pure solvent like tetrahydrofuran. The p...

In this article, the oxidation of alcohols into carbonyl compounds was studied in oxygen atmospheres using a copper oxide on graphene oxide (CuO@GO) nano composites catalyst, synthesized by the wet chemistry method. CuO@GO nano composites were prepared from GO, and CuO NPs by the sol-gel method. The transformation of aromatic alcohols into correspo...

Herein, we report a simple synthetic protocol for selective epoxidation of olefins, monocyclic terpenes, and chalcones using a continuous semi-batch process in good to excellent yields. Mainly, industrial semi-batch epoxidation is an extremely risky process that includes very high safety measures to avoid the accumulation of peroxide species in the...

Objective Misoprostol is a synthetic prostaglandin that is related structurally to naturally occurring prostaglandin (PG), and it has been acknowledged as an effective inhibitor of gastric acid secretion when administered intravenously. Methods In the present study, the novel application of 1,8-Diazabicyclo[5.4.0]undec-7-ene, a cyclic unsaturated...

The development of highly durable, stretchable, and steady triboelectric nanogenerators (TENGs) is highly desirable to satisfy the tight requirement of energy demand. Here, we presented a novel integrated polymeric membrane that is designed by PEDOT: PSSa-naphthalene sulfonated polyimide (PPNSP)-EMI.BF 4 Electronic skin (e-skin) for potential TENG...

Harvesting of flow current through implanted hydrophobic surface within silicone pipe as liquid nanogenerators where Tap water (TW), and DI water (DIw) as liquid reservoirs to successfully convert induced mechanical energy into electrical energy. Here, we used a commercial PTFE film for the generation of a hydrophobic surface as a source of mechani...

The development of highly durable, stretchable, and steady triboelectric nanogenerators (TENGs) is highly desirable to satisfy the tight requirement of energy demand. Here, we presented a novel integrated polymeric membrane that is designed by PEDOT:PSSa-naphthalene sulfonated polyimide (PPNSP)-EMI. BF 4 Electronic skin (e-skin) for potential TENG...

The growing interest in metal–organic frameworks (MOFs) in both industrial and scientific circles has increased in the last twenty years, owing to their crystallinity, structural versatility, and controlled porosity. In this study, we present three novel MOFs obtained from the 1, 3, 5-tris (1H-benzo[d]imidazole-2-yl) benzene (TIBM) organic linker....

We have reported an aerobic oxidation of primary and secondary alcohols to respective aldehydes and ketones using a bipyridyl-cinchona alkaloid based palladium catalytic system (PdAc-5) using oxygen at moderate pressure. The PdAc-5 catalyst was analysed using SEM, EDAX, and XPS analysis. The above catalytic system is used in experiments for differe...

In this study, we synthesized a SiO2-APTES core-shell microsphere (Si-NH2-MS) flame retarding material (FRM) as a heat shielding layer on natural fabrics, such as jute, cotton, and flax(cellulose) fibers. This integration was made to improve the flame retardancy property of pure jute, pure cotton, and pure flax fibers by dip-coating deposition of c...

In this article, a zirconia-based nano-catalyst (Nano-ZrO2), with intermolecular C-N bond formation for the synthesis of various benzimidazole-fused heterocycles in a concise method is reported. The robustness of this reaction is demonstrated by the synthesis of a series of benzimidazole drugs in a one-pot method. All synthesized materials were cha...

The detection of sustainable materials from naturally available resources using a simple fabrication process is highly important for novel research. Here, we used chitosan-PVA (Chs-PVA) blend films via layer-by-layer casting technologies for generating power through mechanical induction through triboelectric nanogenerators. The proposed Chs-PVA bio...

A facile synthetic protocols were employed to prepare process-related impurities associated with the synthesis of pemetrexed disodium heptahydrate, Alimta. The research work is described for the development of the novel synthetic methods and their structure elucidation of Pemetrexed glutamide, N-methyl pemetrexed, and N-methyl pemetrexed glutamide...

In this study, blistered graphene oxide (BGO) soft nanobundles from graphene oxide (GO) were synthesized by thermal exfoliation. GO was prepared by the Hummers method from graphite flakes. Because BGO soft nanobundles are used as efficient flame retardant nanofillers in vinyl ester resins (VERs), the flame retardancy of the as-prepared composites w...

In this study, we established a face-centered cubic CuO nanocrystals (fcc.CuO), and their nano liquids (NLs), and apply them to pool boiling critical heat flux (pbCHF) and thermal conductivity (TC) applications. Additionally, we compared them to commercial CuO nonmaterials. The fcc.CuO was fabricated by a solution chemical method using a specific h...

This study explores the feasibility of treating Jute fibers with a novel treatment process prior to their incorporation into vinyl ester matrix to develop biocomposites. The Jute fibers were treated in-situ within the aqueous solution of Magnesium Nitrate and Sodium Hydroxide in the presence of microwave irradiations. This treatment significantly e...

AIMS A series of six 4-benzylidene-2-((1-phenyl-3,4-dihydro isoquinoline-2(1H)-yl)methyloxazol-5(4H)-one derivatives were synthesized by condensation of substituted aryl aldehydes with 2-(2-(1-phenyl-3,4-dihydro isoquinoline-2(1H)-acetamido)acetic acid in the presence of sodium acetate, acetic anhydride and zinc oxide as a catalyst. BACKGROUND Nov...

Contact electrification is a direct triboelectrification method for producing current through charge transfer when two different differentiated materials have brought into contact. For the first time, we developed a simple triboelectric nanogenerator (TENG) where the electronic charges were realized through contact separation mode between sand-poli...

The present study was performed to validate gas chromatography mass spectrometry analytical method for the determination of mancozeb residues in milk samples. The analytical method is based on the extraction procedure by using mineral acids. The extraction solution was sucked into the flask, the dripping funnel was quickly exchanged for the gas inl...

We report the synthesis of thermally heated pop-up reduced graphene oxide (Pop-rGO) and its nanofluid (Pop-rGO-Nf) in DI water for extended critical heat flux (CHF) in a nucleate pool boiling experiment. When Pop-rGO-Nf is boiled over a nichrome (NiCr) wire heater the CHF values were increased up to 132%, 156%, and 175% with increasing concentratio...

Flow in small size tubing or channels in multidisciplinary field such as Chemistry, medical and lab on chip sensors can be a potential candidate for energy scavenging. Recently, energy harvesting techniques have been developed utilizing the steady flow under induced pressure gradient in lab on chip device. Here, for the first-time harnessing energy...

In this article, we used modified woven carbon fiber mat (wCF-COOH), as one of the contact-electrification Triboelectric Nanogenerator (TENG) friction layer to generate high open circuit voltage (Voc) and short circuit current (Isc). We designed the contact-separation mode TENG which is functional using spring structure. The oxidation of wCF into w...

• Contact-electrification is a conventional triboelectrification technique for generating current through charge transfer when two different polarized materials are brought into contact. For the first time, in-built alternate hydrophilic and hydrophobic nano channels were developed where both ionic and electronic charge transfer mechanisms were rea...

Recently, the triboelectric nanogenerator (TENG) has become a well-known energy harvester for ambient-resource energy harvesting for which the contact electrification between two different materials is employed. Alternatively, research has been carried out on the fluid-based TENG (FluTENG) for the replacement of the conventional solid-based TENG du...

Nanofluids (NFs) are highly promising liquids for critical heat flux (CHF) enhancement in pool boiling, due to their environmental friendliness, easy chemical modification, tunability, low cost, and high thermal conductivity (TC). NFs based on CuO nanoparticles (NPs) are moderately good for CHF applications, but have low TC compared with other meta...

Copper oxide nanoparticles nanofluids (CuO-NPs-NF) are promising candidates for pool boiling critical heat flux (CHF) applications due to their multifaceted advantages like easy tunability, eco-friendliness, cost-effectiveness, easy chemical modification and higher thermal conductivities. In addition, entrapping the CuO-NPs in/on to graphene oxide...

Next generation electronic products, such as wearable electronics, flexible displays, and smart mobile phones, will require the use of unprecedented electroactive soft actuators for haptic and stimuli-responsive devices and space-saving bio-mimetic actuation. Here, a bio-inspired all-organic soft actuator with a π–π stacked and 3D ionic networked m...

Biopolymer-based artificial muscles are promising candidates for biomedical applications and smart electronic textiles due to their multifaceted advantages like natural abundance, eco-friendliness, cost-effectiveness, easy chemical modification and high electical reactivity. However, the biopolymer-based actuators are showing relatively low actuati...

In this article, we describe the synthesis of new and ion-selective nanofiltration (NF) membranes using polyvinylidene fluoride (PVDF) nanofibers and hyperbranched polyethylenimine (PEI) as building blocks. These new nanofibrous composite (NFC) membranes consist of crosslinked hyperbranched PEI networks supported by PVDF nanofibrous scaffolds that...

A family of ladder-type π-excessive conjugated monomer (dicyclopentathienocarbazole (DCPTCz)) integrating the structural components of carbazole and thiophene into a single molecular entity is synthesized and polymerized by oxidative coupling to yield poly(dicyclopentathienocarbazole) (PDCPTCz). Moreover, through the careful selection of 2,1,3-benz...

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organic polymers

Facile synthesis of second-generation dendrons with an aldehyde, epoxy, or t-Boc group at the focal point and nine carboxylic acid groups at the periphery is reported. The scheme includes a coupling of the first-generation dendrons and a two-step, one-pot reaction that proceeds through a Boc deprotection and in situ conjugation at the focal point.

Enantioselective trans-acylation of the racemic benzimidazolyl ethanols was achieved via enzymatic kinetic resolution. A range of commercially available lipases were screened and Novozyme-435 was established as the optimal catalyst. N-Protection was found to be mandatory for effective transesterification. However, electron-withdrawing substituents...

Noncovalent functionalization of carbon nanotubes (CNTs) by dendrons was demonstrated. Certain types of dendrons successfully functionalized CNT surfaces through the noncovalent interactions between the peripheries of the dendrons and the sidewalls of CNTs. Dendrons have a unique anisotropic shape and an orthogonal functional group at their apex, a...

Condensation of o-phenylenediamine sulfate with cinnamic acids in refluxing ethylene glycol yielded the corresponding 2-styrylbenzimidazoles in excellent yields.

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Oxidation of 1-alkyl/aralkyl-2-(α-hydroxyalkyl/aryl)benzimidazoles 1 with KMnO4 on neutral alumina under solid phase conditions gives the corresponding ketones, 1-alkyl/aralkyl-2-acyl-benzimidazoles 2. Compound 2a (R2 = CH3) on condensation with aromatic aldehydes in the presence of solid NaOH under solvent-free conditions, yields the corresponding...

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Benzimidazolium dichromates have been used for the selective and efficient oxidation of simple alcohols to carbonyl compounds. 2-Methylbenzimidazolium dichromate has been used as a standard compound. It has been found to oxidize selectively, primary alcohols to aldehydes, without any over-oxidation, and secondary alcohols to ketones. Of the several...

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Reactions of 1-alkyl-2-(α-bromoacetyl) benzimidazoles (3) with different oxygen nucleophiles such as alkoxides, β-ketophenoxides and β-ketobenzoates yield corresponding 1,2-substituted benzimidazoles.

The simultaneous reaction of 1-substituted-α-bromo-2-acetylbenzimidazoles (1) with potassium thiocyanate and substituted anilines results in the formation of 1-alkylbenzimidazolyl-2-substitutedaminothiazoles (4), which constitutes a convenient one-pot synthesis of the title compounds 4 from readily available starting materials.

Studies on syntheses of 1-alkyl/aralkyl-2-cinnamoylbenzimidazoles (5) have been reported. The title compounds have been synthesized by two different routes, i) Condensation of 2-acetylbenzimidazole (3) with aromatic aldehydes yielding 2-cinnamoyl-benzimidazoles (4) followed by alkylation under Phase-Transfer catalyzed conditions and ii) Alkylation/...