Decades ago ferrihydrite and allophane were considered amorphous with no X-ray patterns. But now with modern techniques, Can we characterize these minerals (substances) well?
Most biochars have alkaline pH (above 8). That could be explained by Ca, Mg, K oxides released during the charring process (pyrolysis). Yet, some biochars have acidic pH (less than 6). What may be...
05 June 2018 2,471 5 View
Soil acidity is often characterized by high Al/Mn and low Ca/Mg. Dolomite or calcite (i.e., agricultural lime) can be used to mix with the surface soil and correct its acidity. But for tree crops,...
04 May 2018 2,245 0 View
It has been reported that biochars can retain anions, such as nitrate and phosphate. Specific adsorption could explain P retention, but positive charge must be present to electrostatically retain...
01 February 2018 6,296 1 View
It is understood that PCA can be used to combine/reduce rather large numbers of related variables into a few independent (orthogonal) factors for statistical analysis and interpretation. Yet, are...
07 August 2017 2,583 1 View
I need to sterilize about 100 kg soil for a greenhouse experiment. Knowing that methyl bromide has been banned and sodium azide or toluene is not appropriate (because I want to study N and C), is...
04 May 2016 481 2 View
Since different biochars have different properties, what kind of biochars should be used as a soil amendment for nutrient-poor, acidic tropical soils? The goal is to improve soil productivity and...
04 May 2016 807 4 View
We know that biochars have several properties from tiny pores that can retain water and protect microorganisms to surface functional groups (e.g., COOH, OH, C=O, etc) that can retain plant...
04 May 2016 4,945 4 View
Biochars are thought of as 'inert' carbon materials, yet their reported CEC are relative high (over 20 centimole of charge per kg). Are these values correct? or the methods of measurement are not...
09 October 2015 2,255 6 View
Eutrophication is a serious problem in many water ways from China to the US gulf coast. It is believed to be caused by high P and N from erosion and run-off. Are there any good ways to control it?
04 May 2015 6,045 2 View
h-index is sometimes listed as a measure of research/citation (quality). How meaningful is it? and what is the expected h-index of a newly-hired assistant professor?
02 March 2015 4,618 7 View
Require for Rietveld refinement in XRD.
08 August 2024 3,081 2 View
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
I want to refine one XRD peak of my in-situ xrd but the background is never working good which ultimately fails the refinement. How to refine and adjust the background using GSAS-II
05 August 2024 5,291 2 View
How to calculate the molar proportions of the oxides from the XRF analyses?
02 August 2024 2,565 2 View
I fabricated Ti3C2Tx using concentrated HF 40%, I plot an XRD as attached image below.. please let to know if I obtained it or not.
02 August 2024 6,789 4 View
What information we can get from PXRD analysis other than from SCXRD analysis of a crystal ?
30 July 2024 6,261 4 View
I will be doing an XRD on a sample which is powdered in natured and is a hydrogenated compound. I would like to know how we can understand the individual components and components by using the...
28 July 2024 4,548 2 View
I am looking to purchase a photography kit for onsite metallurgical investigations, such as capturing photos of worn areas, hot tears, cold tears etc. Could anyone suggest me a good...
22 July 2024 3,490 2 View
I'm working with a hydrogel sample and I'd like to perform XRD analysis. Can anyone offer guidance on preparing the hydrogel for the XRD instrument? Specifically, I'm unsure about the best method...
20 July 2024 3,611 4 View
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