The Experts below are selected from a list of 1233 Experts worldwide ranked by ideXlab platform
Malik Maaza - One of the best experts on this subject based on the ideXlab platform.
-
Green Biosynthesis of Rhodium Nanoparticles Via Aspalathus Linearis Natural Extract
Journal of Nanomaterials & Molecular Nanotechnology, 2017Co-Authors: E. Ismail, Kenfouch M, Mokhotjwa Simon Dhlamini, Simiso Dube, Malik MaazaAbstract:Green Biosynthesis of Rhodium Nanoparticles Via Aspalathus Linearis Natural Extract This contribution report on the bio-synthesis of Rhodium metallic nanoparticles (Rh NPs) synthesized for the 1st time by a completely green process using Aspalathus linearis natural plant extract as an effective bio-oxidizing/bio-reducing agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques such as HR-TEM, HR-SEM, EDS, XRD, XPS, UV and ATR-FTIR spectroscopy. The results confirm the formation of quais - monodisperse spherical Rh NPs in the range of 0.8-1.6 nm.
-
Green palladium and palladium oxide nanoparticles synthesized via Aspalathus linearis natural extract
Journal of Alloys and Compounds, 2017Co-Authors: E. Ismail, Mokhotjwa Simon Dhlamini, Simiso Dube, Mohammed Khenfouch, Malik MaazaAbstract:Abstract This contribution report is the 1st synthesis of nano-scaled Pd and PdO by a completely green process using Aspalathus linearis natural plant extract as an effective bio-reducing as well as a capping agent. Their spherical-like size was found to range within 〈O particles 〉 = 3.8–22 nm. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques such as HR-TEM, DSC, XRD, EDS, XPS, and Raman spectroscopy. The results confirmed the formation of single fcc Pd and pure tetragonal PdO nanocrystals upon annealing at 100 and 600°C in standard air conditions. It was found that the dynamic of the complete oxidation of the bio-synthesized Pd nanocrystals into single phase PdO is very fast; ∼2 h instead 10–20 h classically.
-
Physical & enhanced photocatalytic properties of green synthesized SnO 2 nanoparticles via Aspalathus linearis
Journal of Alloys and Compounds, 2016Co-Authors: A. Diallo, Elayaperumal Manikandan, Venkatachalam Rajendran, Malik MaazaAbstract:Abstract This contribution reports on the synthesis and the main physical properties of n-type SnO2 nanoparticles synthesized for the first time by a completely green chemistry process using Aspalathus linearis’s natural extract as an effective chelating agent. Their surface/interface and volume properties by X-rays diffraction, Raman, X-rays photoemission & photoluminescence spectroscopies are reported. Their average diameter ranging from 2.1 to 19.3 nm follows a thermal governed equation of 〈Oparticles〉 = 1.048 10−5 T2 – 4.92 10−3 T + 2.84. The smallest SnO2 nanoparticles exhibit effective photocatalytic responses to Methylene blue, Congo red and Eosin Y.
-
physical enhanced photocatalytic properties of green synthesized sno 2 nanoparticles via Aspalathus linearis
Journal of Alloys and Compounds, 2016Co-Authors: Malik Maaza, A. Diallo, Elayaperumal Manikandan, Venkatachalam RajendranAbstract:Abstract This contribution reports on the synthesis and the main physical properties of n-type SnO2 nanoparticles synthesized for the first time by a completely green chemistry process using Aspalathus linearis’s natural extract as an effective chelating agent. Their surface/interface and volume properties by X-rays diffraction, Raman, X-rays photoemission & photoluminescence spectroscopies are reported. Their average diameter ranging from 2.1 to 19.3 nm follows a thermal governed equation of 〈Oparticles〉 = 1.048 10−5 T2 – 4.92 10−3 T + 2.84. The smallest SnO2 nanoparticles exhibit effective photocatalytic responses to Methylene blue, Congo red and Eosin Y.
-
Luminescent Eu2O3 nanocrystals by Aspalathus linearis’ extract: structural and optical properties
Journal of Nanophotonics, 2016Co-Authors: A. Diallo, Bakang Moses Mothudi, Elayaperumal Manikandan, Malik MaazaAbstract:This contribution reports on the synthesis and the main physical properties of europium oxide nanocrystals synthesized for the first time by a completely green physical–chemistry process using Aspalathus linearis’ leaves natural extract as an effective chelating agent. The structural and optical properties of such biosynthesized nanocrystals were investigated by electron microscopy, selective electron diffraction, energy dispersive spectroscopy, x-rays diffraction, Raman and x-rays photoelectron spectroscopies, as well as room-temperature photoluminescence. The luminescence properties of such cubic nanocrystals with a 16.5 nm average size were characterized by an intense red emission centered at 614.8 nm (D05−F37) with an average time decay of 7.808 μs.
A. Diallo - One of the best experts on this subject based on the ideXlab platform.
-
Physical & enhanced photocatalytic properties of green synthesized SnO 2 nanoparticles via Aspalathus linearis
Journal of Alloys and Compounds, 2016Co-Authors: A. Diallo, Elayaperumal Manikandan, Venkatachalam Rajendran, Malik MaazaAbstract:Abstract This contribution reports on the synthesis and the main physical properties of n-type SnO2 nanoparticles synthesized for the first time by a completely green chemistry process using Aspalathus linearis’s natural extract as an effective chelating agent. Their surface/interface and volume properties by X-rays diffraction, Raman, X-rays photoemission & photoluminescence spectroscopies are reported. Their average diameter ranging from 2.1 to 19.3 nm follows a thermal governed equation of 〈Oparticles〉 = 1.048 10−5 T2 – 4.92 10−3 T + 2.84. The smallest SnO2 nanoparticles exhibit effective photocatalytic responses to Methylene blue, Congo red and Eosin Y.
-
physical enhanced photocatalytic properties of green synthesized sno 2 nanoparticles via Aspalathus linearis
Journal of Alloys and Compounds, 2016Co-Authors: Malik Maaza, A. Diallo, Elayaperumal Manikandan, Venkatachalam RajendranAbstract:Abstract This contribution reports on the synthesis and the main physical properties of n-type SnO2 nanoparticles synthesized for the first time by a completely green chemistry process using Aspalathus linearis’s natural extract as an effective chelating agent. Their surface/interface and volume properties by X-rays diffraction, Raman, X-rays photoemission & photoluminescence spectroscopies are reported. Their average diameter ranging from 2.1 to 19.3 nm follows a thermal governed equation of 〈Oparticles〉 = 1.048 10−5 T2 – 4.92 10−3 T + 2.84. The smallest SnO2 nanoparticles exhibit effective photocatalytic responses to Methylene blue, Congo red and Eosin Y.
-
Luminescent Eu2O3 nanocrystals by Aspalathus linearis’ extract: structural and optical properties
Journal of Nanophotonics, 2016Co-Authors: A. Diallo, Bakang Moses Mothudi, Elayaperumal Manikandan, Malik MaazaAbstract:This contribution reports on the synthesis and the main physical properties of europium oxide nanocrystals synthesized for the first time by a completely green physical–chemistry process using Aspalathus linearis’ leaves natural extract as an effective chelating agent. The structural and optical properties of such biosynthesized nanocrystals were investigated by electron microscopy, selective electron diffraction, energy dispersive spectroscopy, x-rays diffraction, Raman and x-rays photoelectron spectroscopies, as well as room-temperature photoluminescence. The luminescence properties of such cubic nanocrystals with a 16.5 nm average size were characterized by an intense red emission centered at 614.8 nm (D05−F37) with an average time decay of 7.808 μs.
-
RuO 2 nanoparticles by a novel green process via Aspalathus linearis natural extract & their water splitting response
Journal of Alloys and Compounds, 2016Co-Authors: E. Ismail, A. Diallo, Mohammed Khenfouch, Simon Mokhotjwa Dhlamini, Malik MaazaAbstract:Abstract This contribution reports on the biosynthesis of quasi-monodisperse rutile Ruthenium (IV) oxide nanoparticles with an average diameter of 2.15 nm using Aspalathus linearis natural extract as a chelating agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques. This includes transmission electron microscopy, selective area electron diffraction. Their optical band gap was found to be about 2.1 eV. Loaded onto a p-type Cu 2 O thin film, the nano-scaled RuO 2 –Cu 2 O tandem exhibits an effective water photo-splitting response in the solar spectrum.
-
ruo 2 nanoparticles by a novel green process via Aspalathus linearis natural extract their water splitting response
Journal of Alloys and Compounds, 2016Co-Authors: E. Ismail, Malik Maaza, A. Diallo, Mohammed Khenfouch, Simon Mokhotjwa DhlaminiAbstract:Abstract This contribution reports on the biosynthesis of quasi-monodisperse rutile Ruthenium (IV) oxide nanoparticles with an average diameter of 2.15 nm using Aspalathus linearis natural extract as a chelating agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques. This includes transmission electron microscopy, selective area electron diffraction. Their optical band gap was found to be about 2.1 eV. Loaded onto a p-type Cu 2 O thin film, the nano-scaled RuO 2 –Cu 2 O tandem exhibits an effective water photo-splitting response in the solar spectrum.
Elizabeth Joubert - One of the best experts on this subject based on the ideXlab platform.
-
concise and scalable synthesis of aspalathin a powerful plasma sugar lowering natural product
Journal of Natural Products, 2014Co-Authors: Matthew C Achilonu, Pravin S Kendrekar, Elizabeth Joubert, Daneel Ferreira, Susan L. Bonnet, Jan H Van Der WesthuizenAbstract:Aspalathin (1), a dihydrochalcone C-glucoside, exhibits powerful plasma sugar-lowering properties and thus potentially could be used to treat diabetes. Small quantities occur in rooibos tea, manufactured via fermentation of the leaves of Aspalathus linearis, hence necessitating the need for an efficient and concise synthesis. Efforts to synthesize aspalathin (1) via coupling of a glucose donor to the nucleophilic phloroglucinol ring of the dihydrochalcone moiety have invariably failed, presumably because of ring deactivation by the electron-withdrawing carbonyl group. Reduction of the carbonyl group of a chalcone (15) and coupling of the resulting 1,3-diarylpropane (16) to tetra-O-benzyl-β-d-glucopyranose afforded the C-glucosyl-1,3-diarylpropane (17). Regiospecific benzylic oxidation regenerated the carbonyl group and afforded the per-O-methylaspalathin (1a) quantitatively. This method was not successful with the per-O-benzyl-protected dihydrochalcone. However, the nucleophilicity of the phenolic hydroxy...
-
effects of fermented rooibos Aspalathus linearis on adipocyte differentiation
Phytomedicine, 2014Co-Authors: Micheline Sanderson, Elizabeth Joubert, Sithandiwe E. Mazibuko, Dalene De Beer, Rabia Johnson, Carmen Pheiffer, Johan Louw, Christo J. F. MullerAbstract:Rooibos (Aspalathus linearis) contains a rich complement of polyphenols, including flavonoids, considered to be largely responsible for its health promoting effects, including combatting obesity. The purpose of this study was to examine the effect of fermented rooibos hot water soluble solids on in vitro adipocyte differentiation by using differentiating 3T3-L1 adipocytes. Hot water soluble solids were obtained when preparing an infusion of fermented rooibos at "cup-of-tea" strength. The major phenolic compounds (>5 mg/g) were isoorientin, orientin, quercetin-3-O-robinobioside and enolic phenylpyruvic acid-2-O-β-D-glucoside. Treatment of 3T3-L1 adipocytes with 10 μg/ml and 100 μg/ml of the rooibos soluble solids inhibited intracellular lipid accumulation by 22% (p<0.01) and 15% (p<0.05), respectively. Inhibition of adipogenesis was accompanied by decreased messenger RNA (mRNA) expression of PPARγ, PPARα, SREBF1 and FASN. Western blot analysis exhibited decreased PPARα, SREBF1 and AMPK protein expression. Impeded glycerol release into the culture medium was observed after rooibos treatment. None of the concentrations of rooibos hot water soluble solids was cytotoxic, in terms of ATP content. Interestingly, the higher concentration of hot water soluble solids increased ATP concentrations which were associated with increased basal glucose uptake. Decreased leptin secretion was observed after rooibos treatment. Our data show that hot water soluble solids from fermented rooibos inhibit adipogenesis and affect adipocyte metabolism, suggesting its potential in preventing obesity.
-
Effects of fermented rooibos (Aspalathus linearis) on adipocyte differentiation.
Phytomedicine, 2013Co-Authors: Micheline Sanderson, Elizabeth Joubert, Sithandiwe E. Mazibuko, Dalene De Beer, Rabia Johnson, Carmen Pheiffer, Johan Louw, Christo J. F. MullerAbstract:Rooibos (Aspalathus linearis) contains a rich complement of polyphenols, including flavonoids, considered to be largely responsible for its health promoting effects, including combatting obesity. The purpose of this study was to examine the effect of fermented rooibos hot water soluble solids on in vitro adipocyte differentiation by using differentiating 3T3-L1 adipocytes. Hot water soluble solids were obtained when preparing an infusion of fermented rooibos at "cup-of-tea" strength. The major phenolic compounds (>5 mg/g) were isoorientin, orientin, quercetin-3-O-robinobioside and enolic phenylpyruvic acid-2-O-β-D-glucoside. Treatment of 3T3-L1 adipocytes with 10 μg/ml and 100 μg/ml of the rooibos soluble solids inhibited intracellular lipid accumulation by 22% (p
-
Occurrence and sensory perception of Z-2-(β-d-glucopyranosyloxy)-3-phenylpropenoic acid in rooibos (Aspalathus linearis)
Food Chemistry, 2012Co-Authors: Elizabeth Joubert, Dalene De Beer, Christiaan J. Malherbe, Nina Muller, Susan L. Bonnet, Jan H. Van Der Westhuizen, Daneel FerreiraAbstract:Abstract Z -2-(β- d -glucopyranosyloxy)-3-phenylpropenoic acid (PPAG), a compound postulated to contribute to the taste and mouthfeel of fermented rooibos tea ( Aspalathus linearis ), was isolated from unfermented rooibos plant material. Its structure was unequivocally confirmed by LC–MS, –MS 2 , FT-IR and NMR of the underivatised natural product, and optical rotation measurements of the hydrolysed sugar moiety. A similar compound, postulated to be E -2-(β- d -glucopyranosyloxy)-3-phenylpropenoic acid, was also detected. Analysis of the leaves of a large number of rooibos plants ( n = 54), sampled at commercial plantations, showed that PPAG is not ubiquitously present in detectable quantities in the leaves of different plants. This leads to large variation in the fermented plant material, infusions and food-grade extracts. PPAG was shown to have a slightly bitter to astringent taste and a detection threshold of 0.4 mg/l in water.
-
Enhancement of Rooibos (Aspalathus linearis) aqueous extract and antioxidant yield with fungal enzymes.
Journal of Agricultural and Food Chemistry, 2008Co-Authors: Mia Pengilly, Elizabeth Joubert, Willem H. Van Zyl, Alfred Botha, Marinda BloomAbstract:The leaves and stems of the Rooibos plant (Aspalathus linearis) are used for the production of an herbal tea known for its health promoting properties, which have been linked to its flavonoid content but which is substantially reduced by the traditional processing method employed. Selected food-grade fungi were screened for their potential to improve the yield of soluble matter extracted from rooibos plant material. Fungal cocktails of hydrolyzing enzymes enhanced either the yield of soluble solids (Lentinula edodes and Rhizopus oryzae cultured in yeast peptone-wheat straw medium) or the yield in antioxidants from fermented rooibos (R. oryzae cultured in potato dextrose or yeast peptone-wheat straw medium). When applied to green rooibos, L. edodes (cultured in yeast peptone-wheat straw medium) enhanced the release of soluble solids as well as color formation, leading to semifermented rooibos with a relatively high aspalathin content, compared to fermented rooibos.
Jeanine L. Marnewick - One of the best experts on this subject based on the ideXlab platform.
-
Transcriptomics of the Rooibos (Aspalathus linearis) Species Complex
BioTech, 2020Co-Authors: Emily Amor Stander, Jeanine L. Marnewick, Wesley Williams, Yamkela Mgwatyu, Peter Van Heusden, Fanie Rautenbach, Marilize Le Roes-hill, Uljana HesseAbstract:Rooibos (Aspalathus linearis), widely known as a herbal tea, is endemic to the Cape Floristic Region of South Africa (SA). It produces a wide range of phenolic compounds that have been associated with diverse health promoting properties of the plant. The species comprises several growth forms that differ in their morphology and biochemical composition, only one of which is cultivated and used commercially. Here, we established methodologies for non-invasive transcriptome research of wild-growing South African plant species, including (1) harvesting and transport of plant material suitable for RNA sequencing; (2) inexpensive, high-throughput biochemical sample screening; (3) extraction of high-quality RNA from recalcitrant, polysaccharide- and polyphenol rich plant material; and (4) biocomputational analysis of Illumina sequencing data, together with the evaluation of programs for transcriptome assembly (Trinity, IDBA-Trans, SOAPdenovo-Trans, CLC), protein prediction, as well as functional and taxonomic transcript annotation. In the process, we established a biochemically characterized sample pool from 44 distinct rooibos ecotypes (1–5 harvests) and generated four in-depth annotated transcriptomes (each comprising on average ≈86,000 transcripts) from rooibos plants that represent distinct growth forms and differ in their biochemical profiles. These resources will serve future rooibos research and plant breeding endeavours.
-
Rooibos Aspalathus linearis – Can it reduce the incidence and severity of acute mountain sickness? A case study of Aconcagua (6962 m) climbing expedition, Argentina
Journal of Physical Activity and Health, 2019Co-Authors: Simeon E.h. Davies, Jeanine L. Marnewick, Sacha WestAbstract:Sport and leisure activities at altitude, including climbing, trekking and various snow sports, continue to grow in popularity. However, the increase of high altitude activities is associated with hypoxia and its consequences, namely acute mountain sickness (AMS), which can manifest in two life-threatening conditions, namely high altitude pulmonary edema (HAPE) and high altitude cerebral edema (HACE). The most common methods for dealing with the potential onset of AMS involve acclimatization strategies, such as ascending 500m or less a day, and ingesting prescribed prophylactic medication, which can have adverse side effects. The study focuses on the efficacy of the fynbos plant rooibos Aspalathus linearis to reduce and/or prevent AMS. Rooibos is a unique South African herbal product usually consumed as a tea and a dietary source of unique bio-active antioxidants. A case study was conducted involving eight climbers (mean age: 46.6± 11.2 years) who supplemented their diet with rooibos in capsule form containing ~ 400mg rooibos extract (standardized to include 130mg total polyphenols/capsule) taken 3 times per day during the ascent of Aconcagua (6962 m) in Argentina. The dosage is equivalent to about 6 cups of rooibos tea per day. Daily resting mean heart rate increased from 62 to 87 beats per minutes (bpm) and mean peripheral blood oxygen saturations levels declined from 98% to 79% SpO2. The Lake Louise (LLS) assessment reported negligible symptoms of AMS for seven climbers up to, and at 6000 m. It is tentatively asserted that the findings indicate the potential of the rooibos plant Aspalathus linearis to reduce the symptoms and/or onset of AMS for those persons ascending to high altitudes, whether for sport, leisure or for work.Keywords: Hypoxia, acute mountain sickness (AMS), Rooibos.
-
Visualization of Aspalathin in Rooibos (Aspalathus linearis) Plant and Herbal Tea Extracts Using Thin-Layer Chromatography
Molecules, 2019Co-Authors: Emily Amor Stander, Jeanine L. Marnewick, Wesley Williams, Yamkela Mgwatyu, Fanie Rautenbach, Marilize Le Roes-hill, Uljana HesseAbstract:Aspalathin, the main polyphenol of rooibos (Aspalathus linearis), is associated with diverse health promoting properties of the tea. During fermentation, aspalathin is oxidized and concentrations are significantly reduced. Standardized methods for quality control of rooibos products do not investigate aspalathin, since current techniques of aspalathin detection require expensive equipment and expertise. Here, we describe a simple and fast thin-layer chromatography (TLC) method that can reproducibly visualize aspalathin in rooibos herbal tea and plant extracts at a limit of detection (LOD) equal to 178.7 ng and a limit of quantification (LOQ) equal to 541.6 ng. Aspalathin is a rare compound, so far only found in A. linearis and its (rare) sister species A. pendula. Therefore, aspalathin could serve as a marker compound for authentication and quality control of rooibos products, and the described TLC method represents a cost-effective approach for high-throughput screening of plant and herbal tea extracts.
-
RESEARCH ARTICLE Open Access Amelioration of lipopolysaccharide-induced liver
2016Co-Authors: Olawale Razaq Ajuwon, Oluwafemi Omoniyi Oguntibeju, Jeanine L. MarnewickAbstract:injury by aqueous rooibos (Aspalathus linearis) extract via inhibition of pro-inflammatory modulating oxidative stress and suppressing pro-inflammatory cytokines formation
-
Antioxidant Properties of Rooibos (Aspalathus linearis) - In Vitro and in Vivo Evidence 181
Systems Biology of Free Radicals and Antioxidants, 2014Co-Authors: Jeanine L. MarnewickAbstract:The South African fynbos plant, Aspalathus linearis (Brum.f) Dahlg. (Fabaceae, Tribe Crotalarieae), is traditionally used as a herbal tisane referred to as rooibos or redbush. This plant has claimed medicinal properties based mostly on anecdotal evidence. Rooibos is naturally caffeine free and contains a unique blend of polyphenolic compounds. Based on its in vitro antioxidant potential, a few studies also suggest modulation of oxidative stress/damage by rooibos extracts in experimental animals. More recent studies have examined the bioactivity of rooibos in humans. Together, these factors have contributed to the popularity of
E. Ismail - One of the best experts on this subject based on the ideXlab platform.
-
Green Biosynthesis of Rhodium Nanoparticles Via Aspalathus Linearis Natural Extract
Journal of Nanomaterials & Molecular Nanotechnology, 2017Co-Authors: E. Ismail, Kenfouch M, Mokhotjwa Simon Dhlamini, Simiso Dube, Malik MaazaAbstract:Green Biosynthesis of Rhodium Nanoparticles Via Aspalathus Linearis Natural Extract This contribution report on the bio-synthesis of Rhodium metallic nanoparticles (Rh NPs) synthesized for the 1st time by a completely green process using Aspalathus linearis natural plant extract as an effective bio-oxidizing/bio-reducing agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques such as HR-TEM, HR-SEM, EDS, XRD, XPS, UV and ATR-FTIR spectroscopy. The results confirm the formation of quais - monodisperse spherical Rh NPs in the range of 0.8-1.6 nm.
-
Green palladium and palladium oxide nanoparticles synthesized via Aspalathus linearis natural extract
Journal of Alloys and Compounds, 2017Co-Authors: E. Ismail, Mokhotjwa Simon Dhlamini, Simiso Dube, Mohammed Khenfouch, Malik MaazaAbstract:Abstract This contribution report is the 1st synthesis of nano-scaled Pd and PdO by a completely green process using Aspalathus linearis natural plant extract as an effective bio-reducing as well as a capping agent. Their spherical-like size was found to range within 〈O particles 〉 = 3.8–22 nm. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques such as HR-TEM, DSC, XRD, EDS, XPS, and Raman spectroscopy. The results confirmed the formation of single fcc Pd and pure tetragonal PdO nanocrystals upon annealing at 100 and 600°C in standard air conditions. It was found that the dynamic of the complete oxidation of the bio-synthesized Pd nanocrystals into single phase PdO is very fast; ∼2 h instead 10–20 h classically.
-
RuO 2 nanoparticles by a novel green process via Aspalathus linearis natural extract & their water splitting response
Journal of Alloys and Compounds, 2016Co-Authors: E. Ismail, A. Diallo, Mohammed Khenfouch, Simon Mokhotjwa Dhlamini, Malik MaazaAbstract:Abstract This contribution reports on the biosynthesis of quasi-monodisperse rutile Ruthenium (IV) oxide nanoparticles with an average diameter of 2.15 nm using Aspalathus linearis natural extract as a chelating agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques. This includes transmission electron microscopy, selective area electron diffraction. Their optical band gap was found to be about 2.1 eV. Loaded onto a p-type Cu 2 O thin film, the nano-scaled RuO 2 –Cu 2 O tandem exhibits an effective water photo-splitting response in the solar spectrum.
-
ruo 2 nanoparticles by a novel green process via Aspalathus linearis natural extract their water splitting response
Journal of Alloys and Compounds, 2016Co-Authors: E. Ismail, Malik Maaza, A. Diallo, Mohammed Khenfouch, Simon Mokhotjwa DhlaminiAbstract:Abstract This contribution reports on the biosynthesis of quasi-monodisperse rutile Ruthenium (IV) oxide nanoparticles with an average diameter of 2.15 nm using Aspalathus linearis natural extract as a chelating agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques. This includes transmission electron microscopy, selective area electron diffraction. Their optical band gap was found to be about 2.1 eV. Loaded onto a p-type Cu 2 O thin film, the nano-scaled RuO 2 –Cu 2 O tandem exhibits an effective water photo-splitting response in the solar spectrum.
