Science topic
Powders - Science topic
Substances made up of an aggregation of small particles, as that obtained by grinding or trituration of a solid drug. In pharmacy it is a form in which substances are administered. (From Dorland, 28th ed)
Questions related to Powders
When dealing with the fabrication of Ceramic membrane using Fly Ash & Clay or Kaolin, using sodium silicate as binding agent it breaks & turns into powder at room temperature after sintering at 800°C. Which binding agent is suitable to avoid the turning of membrane into powder form after sintering?
Hi all,
I am working on creating my complete media for VSMC. I have to reconstitute 50mg of ascorbic acid in 10ml H2O (or base media) and then add 2.5ml into my final volume of 250ml complete culture media. How do I ensure the ascorbic acid is sterile when adding to my media after weighing out the product and dissolving the powder into solution?
how i can droplet liquid binder into particles powder during ANSYS fluent
Cerium oxide are predominantly used for the polishing powder. Do we have any other available composite or engineering materials which can be used to achieve these fine polishing of glass surfaces efficiently?
If I synthesize Nickel doped ZnO powder (powder & thin film) by sol-gel method, by those samples which applications I can target? All scientific answers/explanations are highly appreciated. Thank you!
I have synthesized carbon dots from banana peels and I am unable to obtain completely dried brown powder (as read in literature). It is very oily even after oven drying and freeze-drying. Can anybody suggest what may be reason and how to obtain the carbon dots in powder form?
I have a gas atomised powder. I want to use it in laser powder bed fusion. I will use vibratory siever to sieve the powder. What sizes of sieves do I need?
I am working on a project on culture of protease producing bacteria
I want to measure the oxygen concentration in Aluminum oxide powder in ppm. Can anyone suggest how it can be accurately measured?
Hello colleagues,
I am currently working on the development of soil stabilization techniques using metallic tailing powder as a key component. I have completed a research article on this topic and am looking for collaborators or experts in the fields of soil mechanics, geotechnical engineering, or materials science to review and provide feedback on my work.
If anyone is interested in collaborating or reviewing the article, I would greatly appreciate your insights and suggestions to enhance the quality and impact of the research. Please feel free to reach out to me. Thank you!
Best regards,
Wisal Ahmad
Institute of Urban Environment Chinese Academy Of Sciences.
Since the requirement of desired phytochemical in larger volume for various analytical process which requires higher amounts of certain sample in a pure state. Hence, i need to know how much of powderized, crude sample has to be loaded in the thimble to be condensed and obtained as pure sample in concentrated state.
Dear friends, what size of copper powder is suitable for forming alloys with other metals for use in the HMFOR coupled with CO2 reduction? Which transition metal makes alloys with copper powder for this application?
I prepared a graphene using Sonication assisted LPG. and this is a raman spectrum for a powder sample of this graphitic material, how can i estimate the number of layers using the 2D band Data?
I mixed tungsten and titanium and sintered it in cylinder shape diameter 50mm with thickness 4mm. I would like to observe the fracture morphology under SEM. But to study the fracture morphology first I need to break it. WTi is very hard material. I unable to do tensile or compression test to break as the sample is too small. Is there any way to break it like using chemical or how? In published paper they do not mentioned in details how they break it.
Thank you in advance,
Powder samples are likely to contaminate the chamber and damage the pump possibly during pumping and venting steps. Is there a way to prepare powder samples so that they can be processed in the RTP system?
Hi, I'm currently working with salmonella biofilms and the pure culture is enclosed in a freeze dried powder, can any one suggest how I can suggest how I can achieve this?
chicken powder and wheat flour based baked sticks
Dear Colleagues,
Here, I need your consideration in choosing the results of FTIR results. Since, I have some raw data on my materials (clay powder based photocatalyst), I got the FTIR without treatment, baselined, and ATR. Which one should I choose for graph plot? This is my first time use ATR-added FTIR instrument.
Thank you for your time.
Hi there, I am trying to coat a 96-well round bottom plate with poly-HEMA as part of my spheroid assay protocol. I dissolved 20 mg/ml of poly-HEMA in 95% ethanol and added 100 microliters of this suspension to each well.
The protocol I am following recommends to leave the plate to sit in the tissue culture hood (sterile) at room temperature for 24 hours or in the 37 degree celsius incubator for 24-72 hours with the lid ajar.
When I tried this, the outside wells had dried up to the point where we could see white powder residue at the bottom of the well. The inner-most wells were still in solution and had not dried.
I threw this plate out and tried again, this time with the lid on during the drying time, as opposed to ajar. It has been 3 days and we still do not see any drying occuring.
What does the polyHEMA-coated wells look like when optimally dry? How do you know when the polyHEMA has dried and the plate is ready for cell-seeding? How do you dry the plate so that all wells are drying at a constant rate?
Thank you in advance!
dispersion of silver nanoparticle powder
What qualitative analysis i need to perform before doing the quantative analysis?
I saw in an article that the prepared plant aqueous extract was filtered with a suitable filter paper and then diluted to a certain extent and used directly in experiments. Of course, it is normal to work this way. However, is it correct to express the results in μL/mL? However, how could they have calculated how much to dilute the aqueous extract since it was used directly in the experiment, because a stock solution was not prepared since the extracts were not in powder form?
I also saw such a procedure in another study: "2 g of the plants were weighed and 100 ml of distilled water at 100 ° C was added to them and left to infuse for 10 minutes. After the infusion process was finished, it was filtered through filter paper and the supernatant part was stored at 4 ° C for use in experimental studies." However, while doing the experiments, how could this liquid extract be prepared in concentrations of "1 ml of plant extract with concentrations of 50, 250, 500, 750 and 1000 μg/μl" and 20 µl of plant extracts (0, 10, 50, 250, 500, 1000 µg/ml) in these ratios? Because this extract is in liquid form, so in order to dilute it in µg/ml, doesn't it need to remove the solvent of the extract and turn the extracts into powder?
I am asking these questions because I will be conducting a study on herbal teas and will be using the tea extracts I have prepared in liquid form. Therefore, I need to know the correct method for their use.
Please explain micro carbon technology?
I have illustrated how Activated carbon works.three types powder, granular and micro carbon
Hello,
I am trying to spray dry my material (hydrophilic) using PVA, but yield is the problem. During drying, my PVA material is sticking inside the drying chamber as it as film forming property. Can anyone help me how to avoid this and increase the yield of powder in cyclone?
In my lab, we receive dry DNA constructs in a 96 well format plate. We resuspend the DNA using a pipette, adding solvent down each row. I want to use an instrument with a 96channel head to dispense solvent into all the wells at the same time, with tips hovering over the wells instead of dipping into the wells, so that I may re-use the tips. I need to check for splashing or well-to-well contamination due to the use of this instrument.
My idea is to use a powdered form of fluorescein sodium salt, put it in a 96 well plate in a checkerboard format, use the instrument to dispense solvent into all the wells, ensure the dye is dissolved, and then use a plate reader to check for absorption or fluorescence between the wells with dye, and blank wells. Does this experiment make sense? If there is no splashing or well to well contamination due to the 96channel head, I should expect to see fluorescence/ distinct absorbance maxima for the wells with dye while those with only solvent, should not have fluorescence/ different absorption peaks. Also is there a good way to measure out equal but quite small quantities of this dry powder form dye into a plate.
Basically, I need to resuspend a dry material and then take some sort of measurement between blanks/controls and the resuspended material and I need to test this cheaply.
Typical mold powder compositions(wt%) are given as
SiO2=33, CaO=20, MgO=1.5, Al2O3=6.0, Na2O=10.5, K2O=1.5, Fe2O3=2.5, MnO=0.1, Cfree=20.5, CO2=6.5, Ctotal=22.0, F=5.0.
For estimating CaF2 wt% in mold powder, should I calculate stoichiometric CaF2 based on F wt% present in mold powder.
If yes, than CaO wt% have to reduce to compensate Ca present in CaF2.
In that case, basicity of mold powder also decreases since CaO wt% will reduce.
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 find it very hard to get consistent results when I control the the ball to powder mass ratio (I am using the same number of balls, but keeping the total powder mass the same while adjusting the mass between the reactant and catalyst). This makes me think that I should probably control ball to powder volume. However, even though I know the rough bulk volume of two things at the beginning, the powder volume will always increase by an unknown amount once it is milled. So how should I control my reaction??
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.) mobile phase.
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 the compaction process.
What is the value of the elastic modulus for marble dust powder and rice husk ash?
I have to compare the FTIR of the two samples, one is in powder form and other one is the powder dispersed in IPA or water. Both are same material, so how the bond will change
except liquid nitrogen, how to make plastic powder?
I am trying to load curcumin emulsion in 4% chitosan gel but i don not know how many mg powder is needed ?
Good evening, I would like to evaluate the heavy metal content in bird feathers. Can I keep my samples in powder form ? and can I use other tubes than Teflon for digestion?
Need an exact or approximate percentage of water absorption for marble dust or powder and Quarry dust compared to fine aggregate.
fiber powders will be used as a reinforcement.
I am using fibroblast growth factor, purchased in powder form.
What suitable substance should be added to get it in a liquid form? Thanks
We have been lyophilizing several nanoparticles like iron oxide, cerium oxide to get powder sample. However, for gold nanoparticles and any other NPs with gold, they turn sticky after lyophilizing instead of forming powder. Literatures mention they took XRD but I didn't find much on how they prepared the powder sample. One of the literatures suggested using filter paper but nothing really collected in the filter paper when filtered. Any suggestion on how I could get powder GNP for XRD?
Thank you!
After finish the synthesis of nanoparticles.and nanoplates of silver how to take out those as solid/powder form from the solution. Please give a solution of u already done that and succeeded by that
I synthesise intermetallic compounds through nickel and aluminium powders. But the pure powder after synthesis is difficult to obtain. Especially the presence of aluminium oxide very seriously affects the purity of intermetallic compounds. I tried to pass hydrogen during the synthesis to make the aluminium oxide to be reduced. But aluminium is known to be more reducing than hydrogen. Unless hydrogen is plasma. So how do I reduce aluminium oxide.
Hello,
I have bought some mitomycin C in powder. On the instructions, it is said first to dilute the powder in a few drops of ethanol, then in the solvent of choice. But there are many options.
Can I directly dissolve the powder in ethanol (concentration of 1 mg/mL)? Would the solution still be usable? Or is there a better solvent?
Can the solution be stored at -20 degrees?
Thank you
Hello, there,
I'd be interested in the particle powder made from PEG 1500 or other solid-like form of polyethylene glycol with low temperature of melting.
Do you know any companies fabricating such a powder or you are able to fabricate it in the laboratory scale for the research?
Thanks in advance!
Rafał
I am trying to obtain the instrumental broadening from my XRD equipment, and before buying a LaB6 NIST standard I wanted to try the KCl method from Scardi et al (1994). This method consists on sieving the KCl and treating it thermically to obtain a useful standard.
Regarding this I have two doubts:
- How can I check if the KCl sample I have analysed is suitable for the instrumental broadening removal?
- Do you think this procedure (done in the paper for a Bragg-Brentano geometry) is suitable also for GIXRD?
The software I am using is the HighScore Plus.
Reference:
Scardi, P.; Lutterotti, L.; Maistrelli, P. Experimental Determination of the Instrumental Broadening in the Bragg–Brentano Geometry. Powder Diffr 1994, 9(3), 180–186. https://doi.org/10.1017/S0885715600019187.
I am currently using API4000 from SCIEX and I have a problem with some unknown contamination.
I can see some white powder surrounding the orifice of the curtain plate and some unknown powdery stuff on the inner surface of ion source housing.
We are suspecting that the powder / contamination is from the water because the mobile phase filter in the water mobile phase is turning yellow pretty quickly. But we've been using the same HPLC grade water for years, and it's our first time having this issue.
Can anyone please tell me what the possible causes are?
I would like to do an insilico study in a medicated milk. So planning to do LCMS for identifying the phytoconstituents of the same. But the experts suggested to extract the protein and fat portion and do the LCMS. Is there any other methods to use the medicated milk as a whole for LCMS. Is it possible to use the formulation as a lyophilized powder and reconstitute it with methanol for analysis?
When using the absorption spectrum to determine the absorption coefficient (Alpha), do the calculation methods differ between powder samples and thin films? If there are differences, what are the main distinctions in the methods used for each type of sample? How is the absorption coefficient (Alpha) calculated from the absorbance for both powders and thin films? Please explain the key considerations and techniques used in the analysis for each type of sample, including how to handle optical interferences and the effect of sample thickness in thin films compared to powder samples.
I am trying to do small scall experiments in which I mix 50 mL of liquid with a powder to leach the powder. The liquid is concentrated formic acid at 95 degrees C. Right after the experiment is over I need to be able to get everything out of the reactor, including a new powder that forms, very quickly before the liquid and powder cool. I can't use water to rinse the solids out of the reactor because I don't want to dissolve them and I would prefer not to rinse with anything at all. The question is what kind of flask should I use and how do I get all the solid out quickly that remains on the walls after I dump all the liquid. I was thinking of an 100 mL Erlenmeyer flask and a flexible Teflon scrapper/spatula but I can't find a scrapper that small and the small ones that I do find I don't think they are flexible. Any thoughts?
I'd like a powdered form of MCDB 131 Medium with sodium bicarbonate added, and I've noticed that not only is the powder form of this medium difficult to find with NaHCO3 already included, but the same is true for other media like DMEMs. Liquid versions that include NaHCO3 are plentiful. So are powders made this way because the amount of CO2 exposure varies between cell lines/projects and the concentration of buffer therefore needs to vary as well? Or is there some concern with NaHCO3 interacting with other components in its powdered form? Or perhaps it has to do the with manufacturing process for powders? I can't think of a reason that milling in an industrial mill with ceramic stones, for example, would be problematic for sodium bicarbonate, though. I'd love any insights on this.
It is said that graphene layers accumulate again if they are produced and are not in a suitable solvent. So how are these pristine graphene powders supplied? I do not mean graphene oxide or fictionalized graphenes.
The difficulty in mixing is that the fibers are entangled with each other
I want to know for doing EDX analysis to examine the elements present in the biomass, should I do the first pyrolysis or directly do the powder sample analysis? which one is the most favorable? please tell me.
We have phosphor powder (for white light emission under irradiation). We need to make a screen to visualize the electron beam. And there is glass coated with ITO. How to deposit a layer of the phosphor on this glass. Rapid heating, magnetron, spin coating and deep coating and e-beam evaporation methods are available.
Dear researchers,
I have recently synthesised MXene by etching MAX phase source using in-situ fluoride based etchant and collected the supernatant solution obtained after the washing process. My question is how can I determine the concentration of MXene in the solution?
I included an excerpt from a research paper that made me curious about the steps to determine the concentration - "...followed by centrifugation at 3500 rpm for 1 h to obtain the Ti3C2Tx colloidal solution. After drying, 1 mL of the Ti3C2Tx colloid was weighed to calculate its concentration, yielding 1.2 g, then configured into a 1 mg mL−1 solution."
While I see the point of drying the colloid solution and measure the dried powder afterwards, how can one configure the solution into 1mg/ml? Appreciate additional explanation and clarification. Thank you.
I want to prepare cupper selenide powder viva sol gel technique how it is possible?
MgO NPs were synthesized by sol-gel method.
i got Raman peaks at 1022 and 1400
I hydrothermally synthesized a transition metal dichalcogenide material in powder form. When I am doing Raman spectroscopy, the results match the reported literature, but when doing XRD, its powder form does not match. So can you enlighten me about this so that both characterizations match the reported result?
I read an article (https://doi.org/10.1016/j.synthmet.2020.116364) regarding the direct conversion of anthracite into graphene in the presence of molten.
I would like to ask the view from experts regarding the modified methodology.
The authors described the methodology in the paper as follows.
1. Carbon black is first grinded into powder of about 500 mesh.
2. Before using, iron powder (purity, 98 %; size, 400 mesh) is washed with diluted hydrochloric acid (HCl) to remove quickly the iron oxide layer. Then carbon black mixed with iron in the ratio of 1:5 or 1:10 in weight.
3. The mixture is then transferred into corundum crucibles and calcined in a tube furnace at 1600°C for 6 h under a 0.3 L/min argon flow. Heating and cooling rate are set to 10 °C/min. 4. After cooling to room temperature, the calcined mixture is corroded in excessive 1-M HCl for 48 h followed by washing with DI water three times.
5. The solid product is dried for 24 h at 110°C in vacuum oven.
My questions are
(a)Can we reduce the synthesis temperature from 1600°C to lower temperature by using other metal powder?
(b) What is the role of argon in the production of graphene?
(c) Can we still produce graphene using this method if we only use chamber furnace without argon gas supply?
I need the views/opinions from experts.
this pva that I have, works really well for electrospinning. but I don't know its molecular weight. is there any way that I can understand the molecular weight of PVA powder?
Seeking to procure pure silicon powder within the 20-75 range or comparable specifications. Where might one find such a product available for purchase?
Actually, I prepared a large amount of MgO, after aging I kept it in a hot air oven at 120 for 12 hours, but there was still moisture there, then I kept it again in a hot air oven at 120C for 6 hours, then I got white powder.
After that, I calcinated it at 600C for 2h, I got a blackish-gray powder.
I had Titanium Dioxide powder & I need a specific answer for both points:-
- What is the most suitable solnavents used to convert TiO2 powder to TiO2 solution
- What is the most suitable methods used for depostion of the solution on microstrips
i synthesized schiff base with bulk size., any suitable method to convert it in nanosize
with full regards
Hello,
I am performing esterification reactions between fatty acids and alcohols, in presence of methanesulfonic acid and H3PO2 as catalysts. At the end of the reaction, to reach the acid index I want, as well to neutralize the catalysts, I use NaOH, 30 % solution. At the end of the reaction, I perform filtration by using some powders. What I observed is that after a while the acid index increases, this being un inconvenient, because it should be in a certain range. I believe that this might be the effect of an reversible reaction, which means that the catalysts are still active.
What can I use at the end of the synthesis for the neutralization of the catalysts to be sure that the reversible reaction won't take place? or may be there are some composite able to adsorb them?
thank you in advance,
Elena
so the deal is to grind the hyacinth plant and use the powder in the production of earthen blocks. In rammed and adobe block production, what we have seen is that cement is used as a stabilizer for the material. but i wanted to propose hyacinth powder instead what are the pros and cons.
I fabricated CsPbBr3 and CsPbCl2Br QD and made them into powder.
Br3 powder dried well and became fine powder; however Cl2 powder became gel-like powder. Does the composition affects when drying? or Is that because of impurities?
Thank you.
In context of use of pva as a bibder in calcined powder.
I am preparing a drug for oral gavage which needs to be dissolved in 0.5% methylcellulose. The drug powder remains as clump and refuses to go into solution. Any tips on this?
I'm wondering narrow bandgap-color of red wavelength is almost same with powder and solvent when illuminated.
However, when the qd bandgap become widen, then powder color and illumination color is not match. Why this phenomenon happens?
Hi, Research gate! I need HELP!
I'm trying to prepare nickel nanoparticles for my devices. I use the commonly used method from the article (DOI: 10.1002/adma.201405391). Briefly, 20 mmol Ni(NO3)2·6H2O were dissolved in 20 mL of deionized (DI) water to obtain a dark green solution. Then, 4 mL NaOH solution (10 mol L−1) was slowly added into the solution while stirring. After being stirred for 20 min, the colloidal precipitation was thoroughly washed with DI water three times and dried at 80 °C overnight under vacuum. The obtained green powder was then calcined at 270 °C for 2 h to obtain a dark-black powder. The NiOx NPs inks were prepared by dispersing the obtained NiOx NPs in DI water/IPA (3/1, v/v) with a concentration of 20 mg mL−1, stirred for 30 min.
However, the nanoparticles coagulate (precipitate). I can't seem to get the suspension.
What are the subtleties of synthesis? What am I missing? What should I pay attention to?
If I want to check photocatalytic activity, is there any specific reason to choose Nickel doped ZnO thin film sample over Nickel doped ZnO powder sample? How thin film can play role for photocatalysis? Suggestions related this are appreciated.
I need the particle size and the shape of graphene oxide in epoxy powder as shown in the following FESEM morphology
Which component of the tree bark is characterized by this diffraction angle?
It is said that dodecyl-trimethylammonium chloride (DTA) is used to dissolve hyaluronic acid (HA) in an organic solvent such as DMF.
If the experiment is conducted using the method below, will HA (ex. 4.7 kDa) and DTA react in a 1:1 ratio? Or is there an excess of the two?
I want to save HA as much as possible.
[method]
A 7.0% (w/v) solution of dodecyltrimethylammonium chloride in 1.6 ml of deionized water was added dropwise to 1.6 ml of HA 10% (w/v). This reaction formed a white precipitate. The precipitate was then separated from the supernatant by centrifugation. Once lyophilized overnight, the final product was obtained, HA-DTA powder.
Which TEM grids can be used to analyse biochar material, it is fine powder . Any TEM expert can help??
Thanks and Regards