The electrokinetic potential of polyacrylonitrile fibre modified with hydrazine hydrate

1971 ◽  
Vol 2 (2) ◽  
pp. 136-138
Author(s):  
V. F. Androsov ◽  
K. I. Andreeva ◽  
V. S. Bondarenko ◽  
M. A. Zharkova ◽  
T. A. Romanova
Keyword(s):  
Hydrazine Hydrate ◽  
Electrokinetic Potential ◽  
Polyacrylonitrile Fibre

Structural changes in polyacrylonitrile fibre modified with hydrazine hydrate

1973 ◽  
Vol 4 (5) ◽  
pp. 533-535 ◽  
Author(s):  
I. F. Khudoshev ◽  
G. D. Litovchenko
Keyword(s):  
Hydrazine Hydrate ◽  
Structural Changes ◽  
Polyacrylonitrile Fibre

Hydrolysis of polyacrylonitrile fibre structurized with hydrazine hydrate

1975 ◽  
Vol 6 (3) ◽  
pp. 310-312
Author(s):  
I. S. Dorokhina ◽  
M. A. Zharkova
Keyword(s):  
Hydrazine Hydrate ◽  
Polyacrylonitrile Fibre ◽  
Hydrolysis Of

Synthesis and Antibacterial Screening of Some Pyrazole Derivatives Catalyzed by Cetyltrimethylammoniumbromide (CTAB)

2020 ◽  
Vol 17 ◽  
Author(s):  
Ravi Bansal ◽  
Pradeep K. Soni ◽  
Neha Gupta ◽  
Sameer S. Bhagyawant ◽  
Anand K. Halve
Keyword(s):  
Hydrazine Hydrate ◽  
Ethyl Acetoacetate ◽  
Aromatic Aldehydes ◽  
Pyrazole Derivatives ◽  
Phenyl Hydrazine ◽  
One Pot ◽  
Antibacterial Screening ◽  
Water As Solvent ◽  
Substituted Pyrazoles ◽  
Sulfinic Esters

Aims: In this article we have developed an eco-friendly one-pot multi-component reaction methodology was employed for the green synthesis of functionalized pyrazole derivatives viz cyclo-condensation of aromatic aldehydes, ethyl acetoacetate and phenyl hydrazine and/or hydrazine hydrate in the presence of cetyltrimethylammoniumbromide (CTAB) at 90°C temperature in aqueous medium. Method: In the present protocol we developed a green method for the synthesis of functionalized pyrazole derivatives through one-pot, multi-component cyclo-condensation of aromatic aldehydes, phenyl hydrazine or hydrazine hydrate and ethyl acetoacetate using cetyltrimethylammoniumbromide (CTAB) as a catalyst in water as solvent. Our methodology confers advantages such as short reaction time, atom economy, purification of product without using column chromatographic and hazardous solvent. The reaction is being catalyzed by cetyltrimethylammoniumbromide (CTAB) and thus products are formed under the green reaction conditions. Results: Initially the reaction of benzaldehyde and phenylhydrazine with ethyl acetoacetate was carried out in water at room temperature in the absence of the catalyst; no product was obtained after 24 h (Table 1 entry 1). When the reaction was carried out using L-proline as catalyst in ethanol at 70°C the yield of product was 20. Conclusion: This research not only provides a green and efficient method for the synthesis of sulfinic esters but also shows new applications of electrochemistry in organic synthesis. We consider that this green and efficient synthetic protocol used to prepare sulfinic esters will have good applications in future. In conclusion, we have developed successfully a green and efficient one-pot multi-component methodology for the synthesis of substituted pyrazoles using CTAB as a catalyst in water as solvent with excellent yields. Purifications of compounds were achieved without the use of traditional chromatographic procedures. This methodology has advantages of operational simplicity, clean reaction profiles and relatively broad scope which make it more attractive for the diversity oriented synthesis of these heterocyclic libraries. In this methodology we suggest the further alternative possibility for formation of substituted pyrazoles. The compound 7h can be used as an anticancer drug in pharma industry.

scholarly journals Crystalline borophene quantum dots and their derivative boron nanospheres

2021 ◽  
Author(s):  
Huiqi Wang ◽  
Duo An ◽  
Mei Wang ◽  
Liwen Sun ◽  
Ying Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrazine Hydrate ◽  
High Power ◽  
Photoluminescence Properties ◽  
Chemical Exfoliation ◽  
One Step

Crystalline borophene quantum dots with two-photo fluorescence and their derivative boron nanospheres with hydrazine hydrate-dependent photoluminescence properties were prepared by efficient high-power sonication method combined with chemical exfoliation and one-step...

Electrokinetic Potential for Characterization of Nanosctructured Solid Flat Surfaces

2013 ◽  
Vol 25 ◽  
pp. 31-39 ◽  
Author(s):  
Zdeňka Kolská ◽  
Nikola Slepičková Kasálková ◽  
Jakub Siegel ◽  
Václav Švorčík
Keyword(s):  
Zeta Potential ◽  
Isoelectric Point ◽  
Electrokinetic Potential ◽  
Characteristic Parameter ◽  
Metal Nanostructures ◽  
Gold Deposition ◽  
Fast Analysis ◽  
Flat Surfaces ◽  
Acceptable Method ◽  
Point Determination

Electrokinetic potential (zeta potential) is a characteristic parameter for description of the surface chemistry of solid flat materials and it can be used for a fast analysis of materials modified by different chemical or physical methods. Due to its sensitivity, zeta potential is able to distinguish surface modified by coating with monolayers of various materials or nanostructures created after plasma treatment. Also metal nanostructures deposited on surfaces can be characterized by zeta potential. It can also be used for isoelectric point determination of materials. We present data on zeta potential in 0.001 mol/dm3 KCl at constant pH7.0 and also in pH range (2.5-7.0) for isoelectric point determination for pristine polymers PET, PTFE, PS, LDPE, HDPE, PLLA, PVF, PVDF, PMP and polyimides (Upilex R, Upilex S, Kapton). The zeta potential of selected polymers, modified by plasma and by chemical coatings (e.g. by biphenyldithiol or polyethyleneglycol) or by gold deposition was measured too. Zeta potentials of these modified materials were also studied to confirmation that electrokinetic analysis is acceptable method for their fast description.

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