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- Makarova, Tatiana L., et al.
(författare)
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Experimental realization of high spin states in dilutely hydrogenated fullerenes
- 2009
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Ingår i: Physica status solidi. B, Basic research. - : John Wiley & Sons. - 0370-1972 .- 1521-3951. ; 246:11-12, s. 2778-2781
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Tidskriftsartikel (refereegranskat)abstract
- A novel method for preparing dilutely hydrogenated fullerenes H:C60 is presented. DFT calculations of the Raman spectra at the B3LYP/3-21G level are compared with the experimental data. Under the laser treatment these phases form a rich variety of dimeric and polymeric structures, quite in contrast to pristine C60 which forms dimers and polymers bonded through the [2 + 2] addition, and in contrast to heavily hydrogenated fullerenes which do not polymerize at all. Dilutely hydrogenated fullerenes polymerize differently, forming both double bonded structures and single bonded dimers. We have shown that dilute hydrogenation of C60 creates large amount of unpaired spins which disappear due to the formation of diamagnetic single bonded dimers.
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| 2. |
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| 3. |
- Martin, Carlos, et al.
(författare)
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Comparative study of the enzymatic convertibility of glycerol- and dilute acid-pretreated sugarcane bagasse using Penicillium- and Trichoderma-based cellulase preparations
- 2015
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Ingår i: Industrial crops and products (Print). - : Elsevier BV. - 0926-6690 .- 1872-633X. ; 77, s. 382-390
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Tidskriftsartikel (refereegranskat)abstract
- Three enzyme preparations based on the cellulase complex of Penicillium verruculosum and three Trichoderma reesei-based enzyme cocktails were used for evaluating the enzymatic convertibility of cellulose contained in glycerol- and sulfuric acid-pretreated bagasse. The hydrolysis was initially monitored with a micro-scale method using 2 mL of reaction mixture containing 50 g/L of pretreated solids, and at an enzyme load of 10 mg proteinig cellulose. The results were further validated at a higher scale in a setup consisting of 20 mL of reaction mixture with a substrate concentration of 100 g/L. For all the cellulase preparations, and regardless of the experiment scale, glycerol-pretreated bagasse displayed better enzymatic convertibility than acid-pretreated bagasse. It was observed that when the enzyme load is increased from 2 to 10 mg/g, the cellulose conversion is improved but the specific hydrolysis rate is only marginally affected. Although the Trichoderma-based commercial cocktail CC-3 led to higher hydrolysis rates and conversions than all the other enzyme preparations, the Penicillium-based cellulases, especially PV-Xyl PCA and PV-Hist BGL, also showed good potential. PV-Xyl PCA was relatively effective for hydrolysing acid-pretreated bagasse, and PV-Hist BGL displayed reasonable performance in the hydrolysis in absence of exogenous beta-glucosidase.
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