Wan Mohamad Ikhmal

Universiti Malaysia Terengganu | umt · Faculty of Science and Marine Enviornment

Greeting,

When I tried to remotely accessed the scopus database by login into my institution id, it kept bring me back to the scopus preview. I tried cleaning the cache, reinstall the browser, using other internet and etc. But, none of it is working. As you can see in the image. It kept appeared in scopus preview.

Please help..

Greetings dear researchers,

I have fabricated urea-formaldehyde microcapsules for the dispersion in waterborne polyurethane. However, I found out that the waterborne polyurethane have pH 8.56 in liquid state. So, one of my plan is to increase the microcapsules resistance in this pH state. How can I do that? Any suggestion?

Thanks

Greetings fellow researchers,

Can someone give me a suggestion on how can I improve the dispersion of urea-formaldehyde microcapsules in waterborne polyurethane coatings? Because some of them seems to coagulate when I just simply stirred the mixture.

Thanks.

Greetings fellow researchers,

I am trying to adjust the pH of waterborne polyurethane that I bought for a research project. The problem is, no matter how much I tried, the pH only move a little bit. In pristine condition, its pH is 8.40. I want to lower it down to 7 or if possible, to 6.

Several things that I tried include 5% HCl, 5% citric acid, diluted HCl with pH ranging from 4 to 2.8. But, none of it seems to work. Research from google suggest that it might be a buffer effect. However, I am not sure. Even if it is, how can I adjust it?

Thanks.

Greetings dear researchers,

Recently I tried to fabricate microcapsules using a non-polar liquid. After several trials, I managed to form the microcapsules quite a lot in one batch of a solution. I confirm this formation through an optical microscope before and after the vacuum filtration. However, today, when I took the same sample to be analyze under Scanning Electron Microscope (SEM), the results I got are like in the pictures. Not one microcapsules were found even when I found it a lot before under the optical microscope. One of my colleague told me that the problem might be because the SEM I used needs to be pump before the analysis, and this high pressure might have destroyed them. Is this reason feasible?

Also, do you have a way to enhance the amount of microcapsules produced? Because even after 3 hours of stirring, the amount of microcapsules in contrast to other byproducts or whatever are still significantly different.

Greetings,

I want to re-create some published work that use formaldehyde as the wall material for microcapsules. The purpose of this microcapsules are to encapsulate some oil for anticorrosion purpose. However, as we know that formaldehyde is not good for human and animal. And since this microcapsules is planned to be used in coatings and applied to metal-based infrastructure, I am worried about its toxicity effect to the environment.

So, can someone suggest some materials to replace formaldehyde but with similar characteristic and efficiency?

Initially, I planned to make Urea-Formaldehyde (UF) microcapsules.

Greetings dear researchers,

Can anyone suggest a simple and correct way for me to clean the formed corrosion product on my mild steel sample after it has been immersed in a corrosive solution for few days? I have some approaches from ASTM G1-90, but it use several chemicals and I am worried that it might induced corrosion instead of cleaning it. Thank you.

Greeting,

As you can see in the figure attached, I want to ask, if I have a sample that has been immersed for few days already. What is the suitable duration and stab. (mV/s) I should use for the EIS and Potentiodynamic polarization measurements?

The sample is a coated mild steel. Thank you.

Greetings,

My question is very simple. We all know that essential oil does not mix with water and will just float on the water surface. So, let say I want to test its corrosion inhibitive property for a steel that is immersed in 3.5% NaCl, if I just simply added the essential oil, I do not think it will be in contact with the steel.. Not to mention its dispersibility in the water will be not so good. But, I have seen quite a number articles published to highlight the corrosion inhibitive nature of essential oils. So, can someone enlighten me on how to make this possible? (Do I need an emulsifier or not?)