Questions related to TGA
I am running TGA/DTG analysis on a sample of wastes to quantify the amount of calcite in it. In the literature I see that calcite decomposition occurs at T greater than 500 C, but occurs as a single event as evident from a constant slope of the TGA curve (Weight vs T) between 500 and 800 C and a single peak in the DTG curve. On one of my samples I witnessed that there are two events as shown from two peaks at that particular range and from the TGA curve I can clearly see that the slope of the curve changes in that particular range. Does this necessarily mean that there are two different minerals or could the same mineral display more than a single weight loss event?
TGA curves of my biochar and magnetic biochar products that I produced with walnut, rose and sawdust are attached.
I observe a sudden mass loss of 2-3% at the temperature point of 750 degrees throughout.
In my literature review, I could not find a reason to explain this loss.
What could be the reason for this mass loss observed in all of them at the same temperature and in the same amount?
thank you so much.
We were working on glass based material on TGA test and found that there is a glass film inside the crucible and i don't know how to clean it
I recently did the TGA of polypropylene and polylactic acid separately. For both, there was a residual mass of 6% and 1% respectively. For PBAT/PLA mixture, the residual mass was more than 20%. What is residual mass?
I've done a TGA analysis on mesoporous silica nanoparticles. Despite previous works in our group in which samples were pre-treated with oven and lost their moisture and absorbed solvents, I've used desiccator. The results show higher moisture and around 18% weight loss is observed. So my question is do I have to repeat the test before publishing the results because of the great amount of moisture? do you think it could have influence on the resulting data or no? and is it even possible to use oven before TGA even though it is a thermo-related test?
I am reviewing some TGA analysis papers in which a sample is decomposing. The values for the DTG curve appear positive, although from the TGA curve a weight loss is evident. Is it possible that the software is reflecting the sign so the graph is more readable?
I am looking for a way to control the moisture content of the gas which I am sending to TGA for study of oxidation of some metals and alloys.
I got the mass lost data and temperature already, but the lab assistant did not take the same amount of samples, so the curves don't start from the same origin which difficult to compare them. Now, I want to change the data of mass to weight percentage.
I want to analyze the thermal degradation phenomena for 3 different samples using TGA. One of these samples comprises Polymer only, while the other two are loaded with two different percentages of fillers. Should the test weight of all three samples be the same prior to TGA, or degradation trends would hold regardless of differences in the three initial sample weights?
To functionalize the carbon nanotube, I first mixed it in 3 m nitric acid at 60 °C for 15 min. Then I kept it in an ultrasonic bath for 2 hours. After drying, I repeated the same process using hydrogen peroxide. But But the degradation in the TGA analysis was minimal. What would be the reason. or how can i increase the binding of functional groups. Thank you
The silica was prepared from biomass and underwent multiple pretreatment. Other samples prepared by different pre-treatment under oxygen-air atm. did not show weight gain. Intrigued by the results. Could anyone help me with this?
I am doing O2/CO2 research on Combustion and for that I recently need to run some tests on TGA machine model STA 449-F3. My query concerns the selection of Purge gas 1 on the software. This TGA allows me to select different gases only on Purge 1 while Purge 2 is fixed for a very few options. In my case, I have to use a mix of Oxygen and CO2. I have used 2 controller and a flow meters to mix the the gases in the required composition and then attaching to the input of Purge 1.
Now, my question is, does the selection of a Purge gas 1 on the software, has any effect on my results, where if the input mix remains the same?
like if I choose Oxygen as P1 on the software and input mix in actuality is 30% O2/CO2?
Secondly if I choose a previously defined selection option, in the software, of 30% O2/CO2 having density of 1.82 (as shown by the software) and still the input is the same as before, 30% O2/CO2, will the software change the results depending upon which P1 I have selected?
Are the results in this particular TGA, as per received cases?
Does any of the above assumptions and changes have effect on FTIR results?
I will be performing BET analysis for my Biochar and activated Biochar samples. I wanted to know the degassing time and temperature and how does it affect the surface area. Does degassing temperature is determined using TG analysis?
UV visible spectroacopy
Prorammable furnace 2500 temp
Magnetic hot plate stirrer
Vibrating sample magnetometer
Electric properties like IV, capacitance, dielectric, ferrowelectric, ect.
Mechanical properties of thin film , powder, etc
Vacuum coating unit
Oven for lab
Film thickness measurements
Xrd/ hrxrd/ gixrd/ gaxrd
Raman for powder, liquid, film
Energy Dispersive X Ray Analysis (EDX) – elemental analysis
X Ray Photoelectron Spectroscopy (XPS).
Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) – accurate (bulk) determination of specified elements
ICP-Mass Spectrometry (ICP-MS) –simultaneous semi quantitative determination of 70+ elements
Oxidative combustion / Thermo Gravimetric Analysis (TGA).
This is Tadele Asswefa Aragaw, Lecturer and researcher from the Chemical Engineering Department, Bahir Dar University. From our research-grade labratory, we have a TGA instrument with a model: ATAT 2012 and software to this instrument is BJHENVEN. Unfortunately, the TGA software has been failed. Could you help me, please?
Thank You for your cooperation
Okay, this is embarassing, but is there a way to correct the TGA and DSC output data for the experiment where the masses of crucible and sample were placed wrongly?
The pre-experiment input(incorrect)
m (ref cr) = 282.390 mg
m (sam cr) = 20.681 mg
m (sam) = 270.023 mg
those should in fact be:
m (ref cr) = 282.390 mg (correct)
m (sam cr) = 270.023 mg (correct)
m (sam) = 20.681 mg (correct)
I have a list of output data from TG and DSC analyses. How they can be corrected?
For DSC I believe that (mW/mg) can be just multiplied by 270.023 and then divided by 20.681 to obtain correct values...
For TG data in mass loss % I am not that sure...should 270.023 or 270.023+20.681 be used for correction? or how else? I really do not have access for the setup to repeat this experiment unfortunately...
I am working on drying of Faecal sludge and I am using a thermogravimetric analyzer (ELTRA THERMOSTEP TGA) to study it's drying kinetics. The sample weight used was 1g as the nominal sample weight for an ELTRA THERMOSTEP TGA is 1g-5g. Isothermal drying was carried out at 105C; sample was heated at 20C/min to 105C. I want to ascertain if the drying rate curve obtained is correct as the rising rate period occured for about 25min. Attached is a document showing the drying curve and the drying rate curve.
I am working on the drying of Faecal Sludge and I am using a thermogravimetric analyzer (ELTRA THERMOSTEP TGA) to study the drying kinetics. The sample size used was 1g as the ELTRA TGA makes use of a nominal sample size of 1-5g. The drying test was isothermal and done at 105C; samples were heated at 20C/min to 105C. I want to ascertain if my drying rate curve is correct as the rising rate period occured for about 25min. Attached is a document containing the drying curves and the drying rate curves.
I've modified surface of my clay sample with iron. After the process my samples LOI in XRF analysis increased from 6.73% to 18.73%. Later, i've performed TGA analysis for this sample but weight loss was around 6%.
Can anyone please tell me that which one (LOI or TGA) is a more accurate indicator for the sample's thermal stability? And why the difference between two results are so high?
Thanks in advance.
I'm evaluating activation energy of a sample using Friedman method. So, experiments were performed using TGA at four different heating rates 5-10-20-50 °C.min-1. Unfortunately i'm little bit confuse in designing program in MS Excel for the data processing. Exactly, how can i use the friedman equation 📷 to calculate activation energy from TGA data in Microsoft Excel?
In TGA of polymers, initial small weight loss (10%) is due to moisture. No matter what I do to avoid moisture, the loss is still there. How to get rid of it?
I have done heating the sample in an oven for prolonged periods followed by placing it ( polymer sample inside the ziplock airtight bag) in a vacuum desiccator with silica gel.
I am trying to determine molecular formula of my Prussian blue analogue from experimental data. I have TGA data which gives me the amount of water and I have ICP data which gives me K/Fe . So assuming my compund is KFe[Fe(CN)6] . xH2O (without any vacancies), how would I find the molecular formula of my material? Unfortunately I dont have mossbauer data to find the amount of vacancies.
I have seen in literature GO at 600 C getting only 40 to 50 weight loss.but in my case at 220 C wt loss is zero. Why??
I am looking for studies that investigate the effect of electrospinning parameters (solution and process parameters) on the thermal stability of nanofibers. Generally, the effect of nanofiller concentration on the degradation temperature was studied and TGA analysis was not applied for investigating the effect of process parameters on the weight change and degradation temperature.
Our recent article "On the thermogravimetric analysis of polymers: Polyethylene oxide powder and nanofibers" includes a (new) equation that can be used to model the thermal degradation of polymers and eventually to calculate the activation's energy.
You are encouraged to use this equation to fit your experimental data (for example by using Origin Pro). We would like to understand if this equation may be used in a general manner or if the equation has solely a narrow breath.
Please also observe that our previous article on the TGA of iPP-VGCNF nanocomposites contains embedded within its content a simple method to estimate the polymer-nanofiller interface thickness (as order of magnitude)!
We will appreciate your feedback.
Is there any way to determine the composition of biomass using thermogravimetry? I've tried DTG curve deconvolution using Origin software but was not able to get the correct composition. Can anyone please help with how to do this?
Thanks & Regards,
We have imidazole ring N and Imine N for coordinating to metal in 2:1 (L:M) ratio. Both are forming coordinate bind with metal. So two covalent bond is from 2 O atom of acetate group. And the complex found be 6 coordinated in this case? Is there any possibility for this. How can we confirm the structure from IR and TGA for this acetate groups?
We are looking at purchase of several new analytical instruments. What would be the best things to look for in our search. We are a very small undergraduate chemistry program. Our primary use for the instruments would be teaching with research secondary - so less of a "black box" approach is better and massive through-put is not necessary. Thoughts? [Instruments under consideration: IC, TGA, XRF. We already have ICP-AES, AA, HPLC-UV, GC/MS, LC/MS/MS, DSC, IR, (small) NMR.]
I have tried to quaternise P4VP and the mass residue increases from 0 to 12% at 750oC. I have tried to quaternise by chloroacetamide and confirmed it through FTIR and NMR
I have prepared coordination complex, and I know the theoretical chemical formulate concluded from the reaction. I am looking for the empirical chemical formulate of my complex, I can't perform elementary analysis in my lab but I can perform TGA experiment. thus, I am looking for a method that allows me determine the number of ligands surrounding my metal.
I have synthesized cuprous oxide nanoparticles by wet chemical synthesis method. It is actually not stable and it changes its phase to cupric oxide. So I have given an antioxidant treatment to this cuprous oxide. Now I want to check it's thermal stability. I have seen on Research Gate that TGA can be helpful. But I don't know what parameters should I calculate from TGA data to show that my material is stable. Also what atmosphere should be opted for TGA.? There are options of N2, O2 atmosphere. Which one will be suitable for my material?
As far as I know, the TGA results should show decreases in weight but my spent catalyst (Ni/ZrO2-SiO2) weight increased.
I know weight gain should only happen if the samples react with the atmosphere: oxidize. But then the graph shows a straight line (100%) until 400-500 ˚C and then it started to increase. No decreases at all.
I suspect that the instrument needs proper calibration. But then, only for spent catalyst have this problem. All the fresh catalysts showed a standard result in which the weight decreases. So I don't think it's the instrument's fault.
Can quartz wool or glass wool increases in weight when temperature increases?
I suspect probably a tiny bit of quartz/glass wool was mixed with the catalyst.
The conditions that I used were 30˚C to 800˚C with a heating rate of 10˚C /min and used air as the carrier gas.
Is the temperature at which the mixture is debinded lower than the temperature at which each additive is debinded when TGA is measured?
If you know the answer, please give me a paper.
I have Rice Husk biomass and want to get the CHNS composition without using CHNS Analyzer. Are there any other ways without using a CHNS analyzer to get the CHNS composition like TGA?
TGA curves show an increase in the thermal stability of the carrier nanoparticles after drug loading. What is the reason?
Could anyone kindly provide the name of Institute/testing centre and contact details if any in India for TGA of Char in CO2 enviroment .
TGA is used to study the thermal degradation of the polymer based inorganic hybrids, confirming the presence of metal oxides as residual mass. Is it possible to analyze these materials by GCMS to study the fragmentation pattern of the polymers (e.g. cellulose acetate, polyacrylic acid, polylactic acid etc)
I have functionalized a material with an organic compound and performed different analyses such as TGA, XPS, elemental analysis (by EDS and varioMICRO) but I have a difficulty to determine the general formula. Is there any equation?
What is the relationship between onset temperature (determined from TGA weight loss curve) and Ea? Are they must be linearly proportional?
I would like to validate my regression algorithm which calculates activation energy and pre-exponential factor from the TGA curve. It uses integral method (the exponential integral for resolving the right side of the equation):
d_alfa/alfa = -A/beta*exp(-E/R*T)dT
where alfa is the extent of mass loss, beta - heating rate, A - pre-exponential factor, E - activation energy.
I compared my results with literature TG curves but, the results differ slightly. I'm wondering if the error is caused by my calculation algorithm or uncertainty of A and E estimation is so high.
Could anyone provide a simple TG curve (one component, first-order order kinetics) and corresponding A, E, and beta - I believe that the data calculated would be the best because I should receive exactly the same A,E result during regression using my algorithm.
I need to compare the TGA patterns of two similar material. I have heard that comparison between the raw data is not correct! Could you please give me some suggestion to make them comparable?
I need your advice regarding my TGA result. As you can see from picture below, the weight started to increase after being heated at high temperature of 500C. Fyi, I am using nitrogen atmosphere in TGA testing. Is it due to oxidation of iron? And is it possible for oxidation to occur even using nitrogen?
I am trying to clean the TGA crucibles that has adhesive (titanium-based) on it and operated at higher temperature of more than 1000 oC. This material is now stuck on the walls of the crucibles and sometimes it changes into some transparent form at the bottom of the crucible. Argon was used as input gas for analysis.
I have already done the following methods for this:
2. Hot water treatment
3. Scraping of the material physically
4. Flame treatment
4. Acid treatment of H2SO4, and HCl (both for shorter and longer periods of time)
5. SC2 treatment (HCl + H2O2)
I also have aqua regia and piranha solutions in my mind but I did not try them yet. I am looking forward to any suggestions on this to easily remove that material. I would really appreciate your response.
I have performed TGA of a metal oxide and have found that it is almost constant up to 750 °C i.e there is no weight loss. Therefore, on what parameter or basis its thermal stability can be explained?
I have a molded electrical connector. The density is 1.30 g/cc. In the air, the inorganic residue in TGA or ASH test is 12-14%. The FTIR of inorganic residue shows silica (SiO2). XRF analysis indicated a small amount of Na but mostly Al and Si. The FTIR of the composition (attached) indicated it to be PP-based and having Al2SiO3. The part burns very slow and self extinguishes, so perhaps it is V0 rated. FTIR does indicate it not it o be halogenated or with APP type FR additive. Further, the residue is not black char but white powder, So it is unlikely to be APP or other intumescent FR additives which leave black char.
Having a density of 1.30 for filled PP indicates a large amount of FR additive. Al2SiO3 leaves 60% inorganic, ATH 67%, Silicon rubber nearly 80%. The density of most of the inorganic oxides is 2.4-2.6. So for PP (density 0.905) to have a density of 1.30 requires composition to have a large amount of additive, but the TGA indicates much less presence.
We have TA Instruments SDT Q600 and we connected vacuum pump to the furnace with the idea to make TGA/DSC experiments under vacuum conditions. Does anyone have experience with this setup?
I wonder, for atmospheric TGA, the calibration is well described in manuals. Is there something one needs to pay attention when calibrating under vacuum?
Lastly, for atmospheric TGA, one typically uses Calcium Oxalate to check on the performance of the TGA and DSC curves. What standard would one use under vacuum, or more precisely, is there some data that show calcium oxalate TGA+DSC under vacuum conditions?
I want to know the effect of adding filler with polymer so I used thermal analysis TGA, DTG
which parameter more important in determining thermal stability between polymer and composite?
maximum temp of decomposition
weight loss percent
or all above
I am analyzing ACC samples with TGA. From the recieved signal plot, there is a steep decline in measured weight loss and then decline rates becomes less. My question is to how to understand the initial decline rate is purley due to ACC dehydration? Is there a standarad that can be used for TGA ACC analysis that calibrates the reults (for example a fully dehydrated Calcite?)? or a blank test with TGA will be enough?
PS: TGA is having some steel sample for testing and calibration.
I'm looking for an expert in master plot method in terms of biomass kinetic reaction mechanism.
I know which equation should I use, however my curves look totally different from these in other papers. I think, I do something wrong.
Can someone explain me step by step, what should I do to do this analysis? The best will be to show me that on one of my biomass TGA data. I can share these data.
Would like to know how much oxazolidone is form and how much isocyanurate is formed, or are these two functionalities in the same material? percent conversion to oxazolidone?
I am trying to take the TGA data of my sample. However when I get data from instrument Shimadzu's TGA-50. The data is very noisy in the the instrument. The data is not uniformly degraded. How I can get smooth data without noise? Which parameters should be adjusted to collect uniformly degraded data. I have attached the TGA plot of my sample. Kindly suggest me any solution. I shall be thankful
How to calculate Kinetic Parameters from (TGA,DSC,DTA,DTG) curve using Coats-Redfern?
I hope it will be a practical example with detailed steps, whether in Excel or Origin or any other program (entropy S, enthalpy H, G, A, K)
During TGA analysis of the concrete sample, the weight loss (H2O, Ca(OH)2, and CaCO3) at different temperature range is observed.
How we can calculate the bound water loss from that analysis? Can anyone able to provide the example sheet of this bound water calculation analysis?
I have a TGA curve which showed that my UiO-66 is completely converted to ZrO2 at around 530 degrees, I just need to know how to calculate the weight loss ratio.
I am using Vyazovkin's advanced isoconversional method to calculate the activation energies of the co-pyrolysis of biomass and waste tyre mixtures. The problem is that after calculating conversion, the resulting lines cross each other, when in theory they should meet only near conversion = 0 and conversion = 1. The end result is that I am getting negative activations energies, which don't make sense. I belive it might be due to errors during the thermogravimetric analyses, but I have been following the ICTAC recommendations and I don't know what else could be causing these issues. Any input is welcome! thank you in advance.
I want to determine soil organic carbon using TGA. does anyone know the exact methodology, e.g. temperature, gas flow, ets..?
Target bacterial operon is reported to be co-transcribed and co-translated in wild type host. However, protein expression analysis (SDS PAGE) indicates translation of only first gene in frame with His tag.
In my TGA curves related to liquid polysulfide resin-clay nanocomposites, for neat LPS and LPS/CNPs 1% , a small peak can be seen in higher temperatures as in following fig.
what can be an acceptable explanation for this secondary small shoulder?
in other words, what process can suddenly increase the mass of the sample at the end of the process?
If we need to calculate the release% of a certain inhibitor we have the following formula:
Percentage release of inhibitor(%) = Mt/M0 × 100 %
where Mt represents the amount of the released inhibitor at the time of t, and M0 is
the total amount of inhibitor encapsulated inside the container.
How to get M0 from TGA results with a unit similar to Mt, while TGA results show loading of 18 wt.% of the inhibitor inside the container (Mt unit is µg/ml and is acquired from UV- spectroscopy and its standard curves)?
TGA shows solvate formation. DSC shows extra full endotherm of cocrystal.Does it seems polymorph? scxrd shows different cocrystal.
I have performed TGA_DSC of cement paste with different clays. Samples 1-4 showed similar total weight loss and DSC curves, but samples 5 and 6 showed less weight loss.
As all the samples have similar compositions (determined from XRD), what could be the reason for different weight loss for samples 5 and 6?
For samples 1 to 4, 50 mg weight is used whereas for samples 5 & 6, 35 mg weight is used for doing TGA. Can this be a reason for the above change?
HDPE samples were aged at higher temperatures in the presence of water and CO2 than the TGA test was performed in Nitrogen? Weight gain is seen in the curve? What could be the possible reason for that?
Kindly see the curve in attached file.