| 1. |
- Chen, Hong, et al.
(författare)
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PKU-3 : An HCI-Inclusive Aluminoborate for Strecker Reaction Solved by Combining RED and PXRD
- 2015
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Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 137:22, s. 7047-7050
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Tidskriftsartikel (refereegranskat)abstract
- A novel microporous aluminoborate, denoted as PKU-3, was prepared by the boric acid flux method. The structure of PKU-3 was determined by combining the rotation electron diffraction and synchrotron powder X-ray diffraction data with well resolved ordered Cl- ions in the channel. Composition and crystal structure analysis showed that there are both proton and chlorine ions in the channels. Part of these protons and chlorine ions can be washed away by basic solutions to activate the open pores. The washed PKU-3 can be used as an efficient catalyst in the Strecker reaction with yields higher than 90%.
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| 2. |
- Etman, Ahmed S., et al.
(författare)
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A one-step water based strategy for synthesizing hydrated vanadium pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium battery applications
- 2016
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Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 4:46, s. 17988-18001
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Tidskriftsartikel (refereegranskat)abstract
- The synthesis of two dimensional (2D) materials from transition metal oxides, chalcogenides, and carbides mostly involve multiple exfoliation steps in which hazardous solvents and reagents are used. In this study, hydrated vanadium pentoxide (V2O5 center dot nH(2)O) nanosheets with a thickness of a few nanometers were prepared via a facile environmentally friendly water based exfoliation technique. The exfoliation process involved refluxing the precursor, vanadium dioxide (VO2(B)), in water for a few days at 60 degrees C. The proposed exfoliation mechanism is based on the intercalation/insertion of water molecules into the VO2(B) crystals and the subsequent cleavage of the covalent bonds holding the layers of VO2(B) together. The thermal and chemical analyses showed that the approximate chemical composition of the nanosheets is H0.4V2O5 center dot 0.55H(2)O, and the percentage of V-V content to that of V-IV in the nanosheets is about 80(3)% to 20(3)%. The exfoliated aqueous suspension of the V2O5 center dot 0.55H(2)O nanosheets was successfully deposited onto multi-walled carbon nanotube (MW-CNT) paper to form free-standing electrodes with a thickness of the V2O5 center dot 0.55H(2)O layer ranging between 45 and 4 mu m. A series of electrochemical tests were conducted on the electrodes to determine the cyclability and rate capability of lithium insertion into V2O5 center dot 0.55H(2)O nanosheets. The electrodes with the thinnest active material coating (similar to 4 mu m) delivered gravimetric capacities of up to 480 and 280 mA h g(-1) when cycled at current densities of 10 and 200 mA g(-1), respectively.
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| 3. |
- Etman, Ahmed S., et al.
(författare)
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A one-step water based strategy for synthesizing hydrated vanadium pentoxide nanosheets from VO2(B) as free-standing electrodes for lithium battery applications
- 2016
-
Ingår i: Journal of Materials Chemistry A. - 2050-7488. ; 4:46, s. 17988-18001
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Tidskriftsartikel (refereegranskat)abstract
- The synthesis of two dimensional (2D) materials from transition metal oxides, chalcogenides, and carbides mostly involve multiple exfoliation steps in which hazardous solvents and reagents are used. In this study, hydrated vanadium pentoxide (V2O5[middle dot]nH2O) nanosheets with a thickness of a few nanometers were prepared via a facile environmentally friendly water based exfoliation technique. The exfoliation process involved refluxing the precursor, vanadium dioxide (VO2(B)), in water for a few days at 60 [degree]C. The proposed exfoliation mechanism is based on the intercalation/insertion of water molecules into the VO2(B) crystals and the subsequent cleavage of the covalent bonds holding the layers of VO2(B) together. The thermal and chemical analyses showed that the approximate chemical composition of the nanosheets is H0.4V2O5[middle dot]0.55H2O, and the percentage of VV content to that of VIV in the nanosheets is about 80(3)% to 20(3)%. The exfoliated aqueous suspension of the V2O5[middle dot]0.55H2O nanosheets was successfully deposited onto multi-walled carbon nanotube (MW-CNT) paper to form free-standing electrodes with a thickness of the V2O5[middle dot]0.55H2O layer ranging between 45 and 4 [small mu ]m. A series of electrochemical tests were conducted on the electrodes to determine the cyclability and rate capability of lithium insertion into V2O5[middle dot]0.55H2O nanosheets. The electrodes with the thinnest active material coating ([similar]4 [small mu ]m) delivered gravimetric capacities of up to 480 and 280 mA h g-1 when cycled at current densities of 10 and 200 mA g-1, respectively.
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| 4. |
- Litt, Dana M., et al.
(författare)
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Daily level examination indicates that positive affect, but not negative affect, is associated with alcohol and marijuana use among adolescents and young adults.
- 2023
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Ingår i: Psychology of Addictive Behaviors. - 0893-164X .- 1939-1501.
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Tidskriftsartikel (refereegranskat)abstract
- Objective: Although there is growing evidence that alcohol use at the daily level is associated with positivebut not negative affect, results are mixed when examining marijuana use and simultaneous alcohol andmarijuana (SAM) use (i.e., use with overlapping effects). In addition, less is known about these daily levelassociations among diverse samples of adolescents and young adults. The present study will address thesegaps. Method: Participants (N = 1,006; 57.3% female, 43.1% White, Non-Hispanic, ages 15−25; Mage =20.0) were part of a study on substance use that consisted of a 3-week ecological momentary assessment(EMA) burst design (eight surveys per week, up to 2×/day) that was repeated quarterly over a 12-monthperiod. Results: Within-person results indicated that on days with elevated positive affect, participantsreported consuming more drinks, whereas positive affect was not significant for hours high from marijuana.In addition, on days with elevated negative affect, participants reported fewer hours high from marijuana.No association was found between negative affect and number of drinks. Finally, within-person resultsindicated that on alcohol or marijuana days with elevated positive affect, individuals were more likely toreport SAM use. There was no association found between negative affect and SAM use. Conclusions:Results have implications such that in-the-moment interventions for alcohol and SAM use may be moresalient when individuals have higher positive affect than average, whereas such interventions may be morerelevant for marijuana use when negative affect is lower compared to average levels.
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| 5. |
- Litt, Dana M., et al.
(författare)
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Experimental Test of Abstaining-and-Drinking Social Media Content on Adolescent and Young Adult Social Norms and Alcohol Use
- 2023
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Ingår i: Journal of Studies on Alcohol and Drugs. - : Alcohol Research Documentation, Inc.. - 1937-1888 .- 1938-4114. ; 84:5, s. 700-709
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Tidskriftsartikel (refereegranskat)abstract
- Objective: Experimental research has demonstrated that when alcohol-related content is viewed on social media, adolescents and young adults tend to have favorable attitudes toward alcohol use. However, limited research focuses on social media norms for abstaining from alcohol use. The current study examined the role of descriptive and injunctive alcohol-abstaining-and-drinking norms via experimentally manipulated social media profiles. Experimental effects on descriptive and injunctive normative perceptions and subsequent behavior were tested.Method: Participants (N= 306; ages 15-20 years) were recruited from the Seattle metropolitan area to complete a baseline survey and view researcher-fabricated social media profiles. Using stratified random assignment (birth sex and age), participants were randomized into one of three conditions: (a) alcohol abstaining and drinking, (b) alcohol ab-staining, and (c) attention control.Results: The alcohol-abstaining-and-drinking condition reported greater drinking descriptive norms compared with participants in either the alcohol-abstaining or the attention-control conditions at post-experiment and 1-month follow-up. The alcohol-abstaining-and-drinking condition reported lower abstaining descriptive norms (i.e., perceiving fewer peers abstain) compared with those in the alcohol-abstaining condition at post-experiment and lower abstaining injunctive norms compared with those in the attention-control condition at 1-month follow-up.Conclusions: Exposure to social media profiles containing both alcohol-drinking and alcohol-abstaining messages was respectively associated with individuals perceiving that peers were con-suming alcohol more often and that fewer peers were abstaining. The present findings are consistent with prior experimental research that indicates alcohol displays on social media are associated with riskier drinking cognitions.
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