Strained surface siloxanes as a source of synthetically important radicals

Ward, Antony J.; Lesic, Rebecca A.; Proschogo, Nicholas; Masters, Anthony F.; Maschmeyer, Thomas

doi:10.1039/c5ra20399f

Cited by 4 publications

(4 citation statements)

References 35 publications

(26 reference statements)

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“…CHCOO and CH 2 , respectively. The results are in accordance with previously reported literatures [35,41]. The detection of chemical shifts x , y , and z as shown in Fig.…”

Section: Resultssupporting

confidence: 93%

Composite of medium‐chain‐length polyhydroxyalkanoates‐ co ‐methyl acrylate and carbon nanotubes as innovative electrodes modifier in microbial fuel cell

Sirajudeen

Annuar

Ramesh

2020

Biotechnology and Applied Biochemistry

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A microbial fuel cell is a sustainable and environmental‐friendly device that combines electricity generation and wastewater treatment through metabolic activities of microorganisms. However, low power output from inadequate electron transfer to the anode electrode hampers its practical implementation. Nanocomposites of oxidized carbon nanotubes and medium‐chain‐length polyhydroxyalkanoates (mcl‐PHA) grafted with methyl acrylate monomers enhance the electrochemical function of electrodes in microbial fuel cell. Extensive polymerization of methyl acrylate monomers within mcl‐PHA matrix, and homogenous dispersion of carbon nanotubes within the graft matrix are responsible for the enhancement. Modified electrodes exhibit high conductivities, better redox peak and reduction of cell internal resistance up to 76%. A stable voltage output at almost 700 mV running for 225 H generates maximum power and current density of 351 mW/m2 and 765 mA/m2, respectively. Superior biofilm growth on modified surface is responsible for improved electron transfer to the anode hence stable and elevated power output generation.

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“…CHCOO and CH 2 , respectively. The results are in accordance with previously reported literatures [35,41]. The detection of chemical shifts x , y , and z as shown in Fig.…”

Section: Resultssupporting

confidence: 93%

Composite of medium‐chain‐length polyhydroxyalkanoates‐ co ‐methyl acrylate and carbon nanotubes as innovative electrodes modifier in microbial fuel cell

Sirajudeen

Annuar

Ramesh

2020

Biotechnology and Applied Biochemistry

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“…9 ) is consistent with the presence of preexisting Si•, SiO• and SiOO• defects within the borosilicate glass, as previously demonstrated in electron paramagnetic resonance studies of amorphous silica 16 – 18 . Additional surface Si• and SiO• defects may have been generated during the preparatory furnacing of our experimental vials (Methods) during the dehydroxylation of the glass surfaces 19 . In the presence of oxygen in air, Si• can be readily converted at room temperature to reactive superoxides (SiOO•) 7 , 20 (Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…7 ) which can then react with H 2 O at room temperature to form H 2 O 2 (Eqs. ( 8 ) and ( 9 )) 19 . Notably, further generation of H 2 O 2 via this O 2 -mediated pathway has been shown to cease after minerals are heated in water for 24 h at 60 °C 20 .…”

Section: Resultsmentioning

confidence: 99%

“…This gives confidence that our H 2 O 2 analyses were not an artefact of another compound interfering at the same wavelength of analysis. In contrast, no detectable dehydroxylation of the glass surfaces 19 . In the presence of oxygen in air, Si• can be readily converted at room temperature to reactive superoxides (SiOO•) 7,20 (Eqs.…”

Section: Hydrogen and Oxidant Productionmentioning

confidence: 88%

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Tectonically-driven oxidant production in the hot biosphere

Stone

Edgar²,

Gould³

et al. 2022

Nat Commun

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Genomic reconstructions of the common ancestor to all life have identified genes involved in H2O2 and O2 cycling. Commonly dismissed as an artefact of lateral gene transfer after oxygenic photosynthesis evolved, an alternative is a geological source of H2O2 and O2 on the early Earth. Here, we show that under oxygen-free conditions high concentrations of H2O2 can be released from defects on crushed silicate rocks when water is added and heated to temperatures close to boiling point, but little is released at temperatures <80 °C. This temperature window overlaps the growth ranges of evolutionary ancient heat-loving and oxygen-respiring Bacteria and Archaea near the root of the Universal Tree of Life. We propose that the thermal activation of mineral surface defects during geological fault movements and associated stresses in the Earth’s crust was a source of oxidants that helped drive the (bio)geochemistry of hot fractures where life first evolved.

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Strained surface siloxanes as a source of synthetically important radicals

Abstract: The calcination of pure amorphous silica at temperatures up to 850 °C results in the formation of strained siloxane rings which are capable of undergoing homolytic cleavage to generate radicals when in the presence of an appropriate substrate.

Cited by 4 publications

References 35 publications

Composite of medium‐chain‐length polyhydroxyalkanoates‐ co ‐methyl acrylate and carbon nanotubes as innovative electrodes modifier in microbial fuel cell

Composite of medium‐chain‐length polyhydroxyalkanoates‐ co ‐methyl acrylate and carbon nanotubes as innovative electrodes modifier in microbial fuel cell

Tectonically-driven oxidant production in the hot biosphere

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