The use of small angle neutron scattering with contrast matching and variable adsorbate partial pressures in the study of porosity in activated carbons

Mileeva, Z.; Ross, D.K.; Wilkinson, David P.; King, Stephen M.; Ryan, Todd; Sharrock, H.

doi:10.1016/j.carbon.2012.06.046

Cited by 25 publications

(23 citation statements)

References 23 publications

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“…In the present experiments we have used the SANS technique previously developed for studies of activated carbon [5]. In particular, we have demonstrated that deuterated toluene also provides an excellent contrast matching liquid for graphites, condensing into all pores connected to the surface down to the minimum observable pore dimension ($0.2 nm).…”

Section: Contrast Matchingmentioning

confidence: 99%

“…An important result, known as the Porod Invariant (or Total Scattering), is the integral of the cross-section weighted by Q 2 , the value of which can be related to the volume fraction of the pores, u, so long as the cross-section is properly normalized, as it is here [5].…”

Section: 1mentioning

confidence: 99%

“…Small-angle neutron scattering Full reviews of the small-angle neutron scattering from carbons can be found elsewhere [5,6]. However, it is useful to give the general form of the equation expressing the coherent neutron differential scattering cross-section as a function of the scattering vector, Q.…”

Section: 1mentioning

confidence: 99%

“…(2) and Ref. [5]) indicates a pore volume/unit volume that increases by 60% due to irradiation over the measured Q range (between $67 Å and $454 Å (2p/Q max and 2p/Q min )). This could mean either that new pores are being formed or alternatively that pore surfaces are being smoothed and larger pores, initially beyond the measured range, are partially filled, hence becoming observable in this Q range.…”

Section: à4mentioning

confidence: 99%

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A study of the porosity of nuclear graphite using small-angle neutron scattering

Mileeva

Ross

King

2013

Carbon

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Section: Contrast Matchingmentioning

confidence: 99%

Section: 1mentioning

confidence: 99%

Section: 1mentioning

confidence: 99%

Section: à4mentioning

confidence: 99%

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A study of the porosity of nuclear graphite using small-angle neutron scattering

Mileeva

Ross

King

2013

Carbon

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“…The percentage of such atoms in bulk materials is negligibly small; however, it increases significantly for small particles. Contrast matching SANS was employed in [35] to measure the skeleton density of activated carbon powder produced from raw coal by steam activation. The experiments were performed using mixtures of normal and deuterated toluene of known composition.…”

Section: Contrast Variation With Liquids and Gasesmentioning

confidence: 99%

Practical Aspects of Planning and Conducting SAS Experiments

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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This chapter begins with tips on writing a successful beam time proposal followed by the guidelines on the optimization of the instrument configuration that allow maximizing output of the high quality experimental data. Methods of the instrument and sample background subtraction are described along with the choice of optimal sample thickness and other parameters that permit minimizing contribution of multiple scattering. Placing SAS data on absolute scale is important as a sensitive indicator of the applicability of the structural model chosen for the SAS data analysis. This can be achieved by using absolute standards or direct beam measurements. Accurate estimation of the effective thickness of powder samples is required for placing SAS data on absolute scale. Several methods of such estimation using different physical parameters are described along with the contrast variation methods using liquid solutions of protonated and deuterium substituted solvents and pressurized gases as contrast matching media. Applying for Beam TimeThe vast majority of neutron and photon sources operate as "user facilities" that provide access to neutron research instruments for researchers from industry, universities, and government agencies. These facilities are operated with different modes of access. At SNS and HFIR, access is available via a general user program. Calls for proposals are usually issued twice a year, and beam time is allocated on a competitive basis after a peer-review process in which proposals are reviewed for scientific merit. A fraction of total available beam time (~25 % at SNS and HFIR) is allocated for scientific research conducted by instrument personnel and for instrument and sample environment upgrades, etc. A limited amount of beam time might be provided via a "rapid access" route for conducting urgent experiments or feasibility measurements. There is no access charge for researchers whose results are made available to the scientific community by being published in the open scientific literature. A fraction of beam time may be used for confidential, proprietary research, which can be performed only under full cost recovery. Most user facilities have financial assistance programs covering travel, room and board, etc. to encourage new users to acquire their first experience in neutron and x-ray scattering.SAS instruments are in great demand and are usually oversubscribed by a factor of 2-3. Because of the strong competition for beam time, developing good proposal writing skills is essential. Some tips that might help first-time users obtain beam time follow.One of the most important factors is choosing the "right" facility for a particular SAS experiment, including the type of radiation (neutrons vs. x-rays), power (brilliance), and the availability of the relevant sample environment. The higher radiation flux provided by synchrotron sources permits better statistics to be obtained in a shorter time, which could be critical for studying weakly scattering samples or for experiments where it is necessary to ...

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Probing the Behaviour of Fluids Confined in Porous Materials by Neutron Scattering: Applications to CO₂ Sequestration and Enhanced Oil and Gas Recovery

Stefanopoulos

2024

ChemPlusChem

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The current review presents a discussion on the utility of neutron scattering, with emphasis on neutron total scattering and small‐angle neutron scattering (SANS), to explore the structural properties and the phase behaviour of fluids confined in nanopores. The effectiveness of contrast matching SANS on the evaluation of accessibility of porous materials to invading fluids is highlighted too. This review provides also an overview regarding the neutron scattering studies on the structure and the accessibility of greenhouse gases in the complex pore network of geomaterials, with applications to CO2 geological sequestration and enhanced oil and gas recovery.

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The use of small angle neutron scattering with contrast matching and variable adsorbate partial pressures in the study of porosity in activated carbons

Cited by 25 publications

References 23 publications

A study of the porosity of nuclear graphite using small-angle neutron scattering

A study of the porosity of nuclear graphite using small-angle neutron scattering

Practical Aspects of Planning and Conducting SAS Experiments

Probing the Behaviour of Fluids Confined in Porous Materials by Neutron Scattering: Applications to CO₂ Sequestration and Enhanced Oil and Gas Recovery

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The use of small angle neutron scattering with contrast matching and variable adsorbate partial pressures in the study of porosity in activated carbons

Cited by 25 publications

References 23 publications

A study of the porosity of nuclear graphite using small-angle neutron scattering

A study of the porosity of nuclear graphite using small-angle neutron scattering

Practical Aspects of Planning and Conducting SAS Experiments

Probing the Behaviour of Fluids Confined in Porous Materials by Neutron Scattering: Applications to CO2 Sequestration and Enhanced Oil and Gas Recovery

Contact Info

Product

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Probing the Behaviour of Fluids Confined in Porous Materials by Neutron Scattering: Applications to CO₂ Sequestration and Enhanced Oil and Gas Recovery