Prominent misinformation interventions reduce misperceptions but increase scepticism.

Current interventions to combat misinformation, including fact-checking, media literacy tips and media coverage of misinformation, may have unintended consequences for democracy. We propose that these interventions may increase scepticism towards all information, including accurate information. Across three online survey experiments in three diverse countries (the United States, Poland and Hong Kong; total n = 6,127), we tested the negative spillover effects of existing strategies and compared them with three alternative interventions against misinformation. We examined how exposure to fact-checking, media literacy tips and media coverage of misinformation affects individuals' perception of both factual and false information, as well as their trust in key democratic institutions. Our results show that while all interventions successfully reduce belief in false information, they also negatively impact the credibility of factual information. This highlights the need for further improved strategies that minimize the harms and maximize the benefits of interventions against misinformation.

Uses and Grindifications: Examining the Motivators and Antecedents of Grindr Usage Among GBMSM.

Grindr is a popular geospatial networking application (GSNA) among gay, bisexual, and men who have sex with men (GBMSM); it can be used for variety of goals (e.g. finding dates, making friends, or coordinating a hookup) depending on the user's wants. These needs and wants, however, do not arise in a vacuum. Informed by uses and gratification (U&G) theory, this paper examined individual factors such as race, body image and depression as drivers of the motivations behind Grindr usage In an online cross-sectional survey (N = 102), we explored the antecedents of six different motivations (i.e. friendship, sex, entertainment, romantic partnership, social inclusion, and location-based community) for Grindr use among GBMSM. The results revealed that romance and friendship motives increased Grindr usage compared to the other four motivation categories. Across motivation categories, habitual Grindr usage was a significant driver of continued Grindr use. Individual factors such as race, sociosexuality and self-disclosure also influenced users' motivations to use Grindr. Overall, the results point to individual factors eliciting differing motivations for Grindr use, resulting in either outcome-based or passive usage of the application.

Control of Charge-Carrier Mobility via In-Chain Spacer Length Variation in Sequenced Triarylamine Functionalized Polyolefins.

A set of six perfectly regioregular pendant 2,7-bis(phenyl-m-toluylamino)fluorene (TPF) functionalized polyolefins for use as charge transporting materials in polymer light emitting diodes (PLEDs) were prepared and characterized. Synthesis of these materials is straightforward, requiring only three or four steps, depending on the polymer, and final isolated yields over all steps combined were greater than 40% in all but one case. Most notably, these materials exhibit charge-carrier mobilities that can be controlled over 3 orders of magnitude by variation of the number of intermediary carbons (spacer length) between the pendant TPF groups. The range of hole mobilities encompasses the electron mobilities of common electron transport materials/emitters such as Alq3 and PBD, thus, affording the opportunity to fabricate electroactive polyolefin based PLEDs with well matched charge-carrier mobilities and improved performance. We believe this approach to charge-carrier mobility control in electroactive materials could be easily extended to other aryl systems with different HOMO-LUMO levels for energy level and mobility matching with various emitters.

The use of mechanical alloying for the preparation of palladized magnesium bimetallic particles for the remediation of PCBs.

The kinetic rate of dechlorination of a polychlorinated biphenyl (PCB-151) by mechanically alloyed Mg/Pd was studied for optimization of the bimetallic system. Bimetal production was first carried out in a small-scale environment using a SPEX 8000M high-energy ball mill with 4-µm-magnesium and palladium impregnated on graphite, with optimized parameters including milling time and Pd-loading. A 5.57-g sample of bimetal containing 0.1257% Pd and ball milled for 3 min resulted in a degradation rate of 0.00176 min(-1)g(-1) catalyst as the most reactive bimetal. The process was then scaled-up, using a Red Devil 5400 Twin-Arm Paint Shaker, fitted with custom plates to hold milling canisters. Optimization parameters tested included milling time, number of ball bearings used, Pd-loading, and total bimetal mass milled. An 85-g sample of bimetal containing 0.1059% Pd and ball-milled for 23 min with 16 ball bearings yielded the most reactive bimetal with a degradation rate of 0.00122 min(-1)g(-1) catalyst. Further testing showed adsorption did not hinder extraction efficiency and that dechlorination products were only seen when using the bimetallic system, as opposed to any of its single components. The bimetallic system was also tested for its ability to degrade a second PCB congener, PCB-45, and a PCB mixture (Arochlor 1254); both contaminants were seen to degrade successfully.

Mechanism of the degradation of individual PCB congeners using mechanically alloyed Mg/Pd in methanol.

Polychlorinated biphenyls (PCBs) are a continuing concern in the environment, although legislation restricting the production and use of PCBs was introduced more than 30 years ago. The combination of zero-valent metals and hydrogenation catalysts has been proven effective in the remediation of PCBs, although the exact mechanism of degradation is not known as of yet. The use of mechanically alloyed zero-valent magnesium and palladium (on graphite) has shown great success in the dechlorination of PCBs. Knowing the mechanism for this dechlorination would be helpful in optimizing the bimetallic Mg/Pd for use in the field. A variety of experiments have been performed on a single PCB congener (PCB-151, 2,2',3,5,5',6-polychlorobiphenyl) in an attempt to determine the mechanism by which the degradation occurs. The studies are carried out in methanol to mimic the solvent system which will be used in field applications. Results of these studies have suggested three possible mechanisms, all of which include the removal of the chlorine atom by a hydrogen as the rate-limiting step, varying only in the exact nature of the hydrogen species (radical, hydride, or "hydride-like" radical). BRIEF: A series of studies has suggested three possible mechanistic pathways for the degradation of PCBs in methanol by Mg/Pd.

Dechlorination comparison of mono-substituted PCBs with Mg/Pd in different solvent systems.

It is widely recognized that polychlorinated biphenyls (PCBs) are a dangerous environmental pollutant. Even though the use and production of PCBs have been restricted, heavy industrial use has made them a wide-spread environmental issue today. Dehalogenation using zero-valent metals has been a promising avenue of research for the remediation of chlorinated compounds and other contaminants that are present in the environment. However, zero-valent metals by themselves have shown little capability of dechlorinating polychlorinated biphenyls (PCBs). Mechanically alloying the metal with a catalyst, such as palladium, creates a bimetallic system capable of dechlorinating PCBs very rapidly to biphenyl. This study primarily aims to evaluate the effects of solvent specificity on the kinetics of mono-substituted PCBs, in an attempt to determine the mechanism of degradation. Rate constants and final byproducts were determined for the contaminant systems in both water and methanol, and significant differences in the relative rates of reaction were observed between the two solvents.