How can I activate the copper powder?

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How to remove the KOH from ethanolic etherification without using extraction method?

Etherification was carried out between aromatic -OH group and alkyl chloride in the presence of ethanolic KOH. The precursor is a bulky dye compound that consists of an aromatic -OH group and an...

04 May 2019 2,729 4 View

Why this polymeric DSC have three peaks and no dip?

The sample is polymer and I sent this sample for analysis. The obtained DSC curve was kind of unexpected. The curve looks different from what I have studied and seen before. 1. Why the glass...

31 December 2017 8,614 9 View

Is it possible to get the higher molecular weight(Mw) first before getting the lower Mw during the Soxhlet extraction of the polymer?

I tried to extract the polymer through Soxhlet extraction. According to some references, the sequence for the organic solvents is methanol, acetone, hexane, toluene, and chloroform. The...

11 December 2017 5,006 3 View

Can I use cellulose Soxhlet thimble instead of glass fibre thimble for the Soxhlet extraction in polymerization?

I read that most previous studies used glass fibre thimble instead of the cellulose thimble. The solvents are methanol, acetone, hexane, toluene, dichloromethane, chloroform. If I use cellulose...

04 May 2017 1,498 3 View

Why the entire FTIR spectrum shifted to the left after dimerization?

2,5-dibromonitrobenzene (monomer) 4,4’-dibromo-2,2’-dinitrobiphenyl (dimer) The FTIR spectra for these two are basically the same. But the dimer spectrum shifted to the left. Isn't that when the...

01 February 2017 10,099 3 View

How can I get freshly powdered KOH from commercially bought KOH pallets?

The KOH absorb atmospheric moisture quite fast when I manually powdered it.

01 February 2017 4,004 4 View

Which is the suitable NMR solvent for compound that does not dissolve in DMSO-d6 and CDCl3?

I would like to scan NMR for a compound name : 4,4'-dibromo-2,2'-diaminobiphenyl. According to some papers, the NMR solvents used are either CDCl3 or DMSO-d6. However, when I try to dissolve my...

31 December 2016 3,035 10 View

What is the purpose of adding HBr in bromination? Hbr/Br2 system.

Is the HBr was added to prevent the formation of HBr as by-product from Br2 during the reaction (minimize the wastage of Br2)? And to move the reaction forwards faster?

11 December 2016 4,960 7 View

Why DMSO is used even though the compounds are soluble in DMF?

I get to know that the solvent DMF is technically similar to the DMSO for organic synthesis, just that DMSO can dissolve more compounds than the DMF. Is there any special reason that DMSO is used...

10 November 2016 6,784 7 View

Can the commercial reusable dry ice packs be used as dry ice in my experiment?

I have a few packs of reusable dry ice-gel packs. They are sent along with the chemicals in a box for keeping the chemicals cool. Is it possible for me to use that "gel" as dry ice to reach the...

09 October 2016 9,082 5 View

Why do i have a weak plasma and no coating during rf sputtering?

I have been getting a low plasma and no coating while doing rf sputtering of copper doped ZnS using a power of 140 watts and at pressure of 6.5x10-3 Mb.

07 August 2024 4,526 4 View

Why activated CAR-Jurkat cell could not kill targets?

Previously when I co-coluture anti-CD19(FMC63) CAR-Jurkat with Raji with E:T=5:1, Jurkat can eliminate Raji in 24h. However, when I test another CAR construct, although I can dectect totally CD69...

06 August 2024 641 2 View

How to understand this crystallographic phenomenon of low temperature crystals in zeolite?

During low-temperature testing, new diffraction peaks that appear could be indicative of several phenomena. In one of our tests, we observed notable new peaks around 40° and 45° in a specific...

06 August 2024 726 3 View

Why Powder XRD is performed after cruhsing a crystal if Single Crystal XRD analysis of the same crystal has been performed already ?

What information we can get from PXRD analysis other than from SCXRD analysis of a crystal ?

30 July 2024 6,261 4 View

Addition of EDTA during the synthesis of copper nanoparticles to prevent it from being oxidized?

I've attempted to use this method to synthesize copper nanoparticles. Copper nanoparticles can be synthesised using a variety of precursor materials. CuSO4, distilled water, NaOH, and EDTA are...

28 July 2024 8,027 3 View

HAs anyone used TGA to find activation enegy of water evaporation?

I have different polymer solutions and I hypothesize that water molecules are retained based on the water-polymer interactions, so the amount of free water is less to intercat with drug tablet....

28 July 2024 9,545 6 View

Mechanochemistry: ball to powder mass or ball to powder volume?

I run mechanochemical reactions that involves the use of a large amount of catalyst (1:1 molar ratio to the reactant). When I try to understand the effect of amount of catalyst on the reaction, I...

23 July 2024 9,938 1 View

What could be the possible reason that sintering of polycrystalline diamond fabricated with tape casting has suddenly started failing?

I make polycrystalline diamond with tape casting followed by HPHT sintering. When i sintered the samples up till May, the sintering was good. When i sintered the samples in June and July at the...

16 July 2024 3,212 5 View

I want to plot calibration curve of pure mirtazapine powder using HPLC. Can someone please suggest a method without HPLC buffer as a mobile phase?

I am searching for HPLC method to estimate Mirtazapine but i want to avoid HPLC-buffers as a mobile phase component. So, I am looking for alternative HPLC-solvent (acetonitrile, methanol etc.)...

14 July 2024 1,493 3 View

What binders suggestion that I can use for zinc alloy?

I am working on powder metallurgy, and during the compaction process, the powder does not pelletize and remains in its powder form. To address this issue, I am considering using binders to improve...

13 July 2024 9,003 2 View

Tapan Biswas

Hi, u can check the attached article.

Good luck.

Ajay Kumar

Recently, I have been looking for same problem.

Found some good references :

Article ChemInform Abstract: Copper-Mediated Aerobic Fluoroalkylatio...

https://pubs.acs.org/doi/pdf/10.1021/jo030212p

Krishnachaitanya Talluri

Please see this procedure