ResearchSpace
→
Research Publications/Outputs
→
Journal Articles
→
Browsing Journal Articles by Author

Browsing Journal Articles by Author "Langmi, Henrietta W"

Now showing items 1-20 of 36

Next Page

Compaction of a zirconium metal–organic framework (UiO-66) for high density hydrogen storage applications

Author: Bambalaza, Sonwabo E ; Langmi, Henrietta W ; Mokaya, R ; Musyoka, Nicholas M ; Ren, Jianwei ; Khotseng, LE Date: Nov 2018 We report a rare case whereby a metal–organic framework (MOF), namely UiO-66, is compacted at high pressure (700 MPa or 100 000 psi) resulting in densification and improved total volumetric hydrogen storage capacity, but crucially, without ... Read more
A comparison of hydrogen storage capacity of commercial and fly ash-derived zeolite X together with their respective templated carbon derivatives

Author: Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Oct 2015 This paper presents comparative results of structural, morphological and hydrogen sorption properties between commercial and fly ash-derived zeolite X including their respective templated carbon derivatives. The surface area of commercial ... Read more
Comparison of MOF-5- and Cr-MOF-derived carbons for hydrogen storage application

Author: Segakweng, T ; Musyoka, Nicholas M ; Ren, Jianwei ; Crouse, P ; Langmi, Henrietta W Date: Nov 2015 Nanoporous carbons which possess high surface areas and narrow pore size distributions have become one of the most important classes of porous materials with potential to be utilized for hydrogen storage. In recent times, several metal–organic ... Read more
Current research trends and perspectives on materials-based hydrogen storage solutions: A critical review

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Liao, S Date: Jan 2016 Effective hydrogen storage solutions have been pursued for decades, and materials-based hydrogen storage is a research frontier of much current interest. Yet, no researched materials to date have come close to the DOE 2020 targets for hydrogen ... Read more
Effect of inclusion of MOF-polymer composite onto a carbon foam material for hydrogen storage application

Author: Molefe, Lerato Y ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Ndungu, PG Date: Aug 2020 Despite the extensive studies done on the remarkable characteristics of metal–organic frameworks (MOFs) for gas storage applications, several issues still preclude their widespread commercial lightweight applications. In most cases, MOF ... Read more
Electrospun MOF nanofibers as hydrogen storage media

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Annamalai, P ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Jun 2015 In this study, Zr-MOF and Cr-MOF were chosen as representatives of the developed MOFs in our laboratory and were incorporated into electrospun nanofibers. The obtained MOF nanofibers composites were evaluated as hydrogen storage media. The ... Read more
Electrospun zeolite-templated carbon composite fibres for hydrogen storage applications

Author: Annamalai, Perushini ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Bessarabov, D ; Petrik, LF Date: Jan 2017 The current study explored the application of the electrospinning technique to produce multi-hierarchical composites for hydrogen storage applications. Predetermined control of fibre porosity is expected to enable production of well-defined ... Read more
Fabrication of core-shell MIL-101(Cr)@UiO-66(Zr) nanocrystals for hydrogen storage

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Kang, X Date: Sep 2014 The fabrication of coreeshell nanocrystals by incorporating microporous UiO-66 into mesoporous MIL-101 is reported. The growth of the coreeshell MIL-101@UiO-66 nanocrystals was observed and supported by TEM and PXRD. The accessible pore volumes ... Read more
Feasibility of varied polyethylene terephthalate wastes as a linker source in metal-organic framework UiO-66(Zr) synthesis

Author: Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Ren, Jianwei ; Mathe, Mahlanyane K ; Onyango, MS Date: Aug 2019 Polyethylene terephthalate (PET), a chemically stable polyester with multiple applications, has risen dramatically in manufacturing and consumption in the past decades. The increase in PET use has resulted in considerable volumes of waste PET ... Read more
Green synthesis of chromium-based metal-organic framework (Cr-MOF) from waste polyethylene terephthalate (PET) bottles for hydrogen storage applications

Author: Ren, Jianwei ; Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Onyango, MS Date: Oct 2016 It is of great economic value to produce high-value PET-based MOF materials by the veritable elimination of waste PET, and provide sufficient MOF materials for hydrogen storage applications. Consequently, this work demonstrates the use of ... Read more
Hydrogen storage in metal-organic frameworks: A review

Author: Langmi, Henrietta W ; Ren, Jianwei ; North, Brian C ; Mathe, Mahlanyane K ; Bessarabov, D Date: May 2014 Metal-organic frameworks (MOFs) for hydrogen storage have continued to receive intense interest over the past decade. MOFs are a class of organic-inorganic hybrid crystalline materials consisting of metallic moieties that are linked by strong ... Read more
In-situ IR monitoring of the formation of Zr-fumarate MOF

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: May 2017 The in-situ IR technique was employed to monitor the crystallisation process of Zr-fumarate (Zr-fum) MOF under real synthesis conditions. The results evidenced the participations of both modulator acid (HCOOH) and solvent (DMF) during the ... Read more
In-situ IR monitoring to probe the formation of structural defects in Zr-fumarate metal-organic framework (MOF)

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Walker, J ; Mathe, Mahlanyane K ; Liao, S Date: Oct 2018 In this work, in-situ IR monitoring technique was employed to monitor the crystallization process of Zrfumarate (Zr-fum) MOF in both H2O- and DMF-based systems. Wherein, the acid modulator (HCOOH) was only observed to be consumed in the ... Read more
Incorporation of UiO-66 into graphene foam for hydrogen storage applications

Author: Bambalaza, Sonwabo E ; Langmi, Henrietta W ; Musyoka, Nicholas M ; Ren, Jianwei ; Khotseng, LE Date: May 2018 The fabrication of application-specific metal-organic framework (MOF) composites has the potential to shift more towards hydrogen storage system integration. The in-situ growth of nano particles on a graphene surface is a common technique for ... Read more
Metal–organic frameworks for hydrogen storage

Author: Langmi, Henrietta W ; Ren, Jianwei ; Musyoka, Nicholas M Date: Aug 2015 Over the past decade, hydrogen storage in metal-organic frameworks (MOFs) has received increasing attention worldwide because they possess versatile structures, high surface areas, large free volumes, ultrahigh porosities, and tunable pore ... Read more
Microwave-assisted modulated synthesis of zirconium-based metal–organic framework (Zr-MOF) for hydrogen storage applications

Author: Ren, Jianwei ; Segakweng, T ; Langmi, Henrietta W ; Musyoka, Nicholas M ; North, Brian C ; Mathe, Mahlanyane K ; Bessarabov, D Date: May 2014 Zirconium-based metal–organic framework (Zr-MOF) was synthesized using a microwave-assisted modulated method in a short reaction time of 5 min. The Zr-MOF material was highly crystalline with well-defined octahedral shaped crystals, and it ... Read more
Modeling hydrogen storage in boron-substituted graphene decorated with potassium metal atoms

Author: Tokarev, A ; Avdeenkov, AV ; Langmi, Henrietta W ; Bessarabov, DG Date: Mar 2015 Boron-substituted graphene decorated with potassium metal atoms was considered as a novel material for hydrogen storage. Density functional theory calculations were used to model key properties of the material, such as geometry, hydrogen ... Read more
Modulated synthesis of chromium-based metal-organic framework (MIL-101) with enhanced hydrogen uptake

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Segakweng, T ; North, Brian C ; Mathe, Mahlanyane K ; Kang, X Date: Aug 2014 Modulated synthesis of MIL-101(Cr) in high yield and with good reproducibility using formic acid as a modulator is reported. Higher molar ratio of formic acid/CrCl(sub3) was found to form better shape-defined MIL-101(Cr) crystals with higher ... Read more
Modulated synthesis of zirconium-metal organic framework (Zr-MOF) for hydrogen storage applications

Author: Ren, Jianwei ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Bessarabov, D Date: Jan 2014 A modulated synthesis of Zr-metal organic framework (Zr-MOF) with improved ease of handling and decreased reaction time is reported to yield highly crystalline Zr-MOF with well-defined octahedral shaped crystals for practical hydrogen storage ... Read more
A more efficient way to shape metal-organic framework (MOF) powder materials for hydrogen storage applications

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Swartbooi, Ashton M ; North, Brian C ; Mathe, Mahlanyane K Date: Apr 2015 Shaping of Zr-MOF powder material into spherical pellets with diameters of 0.5–15 mm in the presence of 10 wt.% sucrose as a binder was successfully demonstrated using a granulator. Zr-MOF pellets were produced in a kilogram batch within 30 ... Read more

Now showing items 1-20 of 36

Next Page

Browse

All of ResearchSpace
This Collection
- By Issue Date
- Authors
- Titles
- Subjects
- Publication Type
- Cluster
- Impact Area

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Copyright © CSIR 2017. All Rights Reserved

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.