bluuebunny/crossref_metadata_2025_split huggingface dataset:
Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**
Authors: Senarathna Milinda C. , Li He , Perera Sachini D. , Torres‐Correas Jose , Diwakara Shashini D. , Boardman Samuel R. , Al‐Kharji Noora M. , Liu Yi , Smaldone Ronald A. 
Published: October 2023

AbstractCovalent organic frameworks (COFs) are known to be a promising class of materials for a wide range of applications, yet their poor solution processability limits their utility in many areas. Here we report a pore engineering method using hydrophilic side chains to improve the processability of hydrazone and β‐ketoenamine‐linked COFs and the production of flexible, crystalline films. Mechanical measurements of the free‐standing COF films of COF‐PEO‐3 (hydrazone‐linked) and TFP‐PEO‐3 (β‐ketoenamine‐linked), revealed a Young's modulus of 391.7 MPa and 1034.7 MPa, respectively. The solubility and excellent mechanical properties enabled the use of these COFs in dielectric devices. Specifically, the TFP‐PEO‐3 film‐based dielectric capacitors display simultaneously high dielectric constant and breakdown strength, resulting in a discharged energy density of 11.22 J cm−3. This work offers a general approach for producing solution processable COFs and mechanically flexible COF‐based films, which hold great potential for use in energy storage and flexible electronics applications.
Molecular Recognition Regulates Coordination Structure of Single‐Atom Sites
Authors: Zhao Chang‐Xin , Liu Xinyan , Liu Jia‐Ning , Wang Juan , Wan Xin , Wang Changda , Li Xi‐Yao , Shui Jianglan , Song Li , Peng Hong‐Jie , Li Bo‐Quan , Zhang Qiang 
Published: October 2023

AbstractCoordination engineering for single‐atom sites has drawn increasing attention, yet its chemical synthesis remains a tough issue, especially for tailorable coordination structures. Herein, a molecular recognition strategy is proposed to fabricate single‐atom sites with regulable local coordination structures. Specifically, a heteroatom‐containing ligand serves as the guest molecule to induce coordination interaction with the metal‐containing host, precisely settling the heteroatoms into the local structure of single‐atom sites. As a proof of concept, thiophene is selected as the guest molecule, and sulfur atoms are successfully introduced into the local coordination structure of iron single‐atom sites. Ultrahigh oxygen reduction electrocatalytic activity is achieved with a half‐wave potential of 0.93 V versus reversible hydrogen electrode. Furthermore, the strategy possesses excellent universality towards diversified types of single‐atom sites. This work makes breakthroughs in the fabrication of single‐atom sites and affords new opportunities in structural regulation at the atomic level.
Fabrication methodologies for antimicrobial polypropylene surfaces with leachable and nonleachable antimicrobial agents
Authors: Alkarri Saleh , Sharma Dimple , Bergholz Teresa M. , Rabnawaz Muhammad 
Published: October 2023

AbstractReported herein is the fabrication of antimicrobial polypropylene (PP) surfaces with nonleachable magnesium hydroxide biocides and compares its performance with leachable copper (II) chloride dihydrate. Two methods were used for creating PP‐bearing biocides. One way involves melt‐blending of biocides and PP and subsequent injection molding to create the desired antimicrobial PP surface. Another technique consists of thermal embossing of antimicrobial agents on the PP surface. The biocide‐bearing PP surfaces were evaluated against Escherichia coli (E. coli) K‐12 MG1655) for up to 24 h. In the case of injection‐molded PP system, leachable CuCl2·2H2O showed a 5.87 ± 0.01 log reduction after 24 h, but only 0.47 ± 0.03 log reduction for PP bearing nonleachable Mg(OH)2. On the contrary, thermally embossed PP with CuCl2·2H2O and Mg(OH)2 showed 2.28 ± 0.03 and 3.78 ± 0.03 log reductions, respectively, after 24 h. The nonleachable Mg(OH)2 imparted antimicrobial properties only to the PP surface prepared via thermal embossing. In contrast, owning to the leachable copper ions, leachable CuCl2·2H2O biocides imparted PP surfaces antimicrobial irrespective of the molding or surface embossing approach. This approach provides an advantage for nonleachable PP‐based antimicrobial surfaces in overcoming the toxicity concern associated with plastics bearing leachable biocides.
Preparation, characterization, and retarding mechanism of high temperature resistant amphoteric ion polymer oil well cement retarderPoly‐AAMDforHTHPapplication
Authors: Jinhua Huo , Xing Zhang , Junwei Liu , Ruizhi Zhang , Chenxi Wei , Siman Zhang , Shanjian Li 
Published: October 2023

AbstractThe amphoteric ion polymer cement retarder Poly‐AAMD was synthesized by aqueous solution polymerization, the chemical structure, molecular weight, and thermal stability was studied. As a result, theMnandMware 1.3 × 104and 4.7 × 104 g/mol, respectively, and the initial decomposition temperature is 260°C. Then, the effects of retarder Poly‐AAMD on the application performance of cement slurry, such as settlement stability, thickening time, compressive strength, and rheological properties, were investigated. Especially, the thickening time of cement slurry with 1.2 and 1.5 wt% retarder Poly‐AAMD is 312 and 316 min at 220°C, the compressive strength is larger than 14 MPa at 24 h. Compared to conventional retarders, the temperature resistance has been improved to 220°C. Simultaneously, the initial hydration process of cement slurry was studied by low field NMR based on theT2value. Moreover, the hydration products of cement slurry with retarder Poly‐AAMD were analyzed depends on the qualitative and quantitative analysis methods, the type and content of hydration products were confirmed by the methods of X‐ray diffraction analysis (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TG), and differential thermal analysis (DTG). Finally, the retarding mechanism of retarder Poly‐AAMD was further studied depends on the results of adsorption amount and Zeta potential.
An attempt for morphology‐based quantitative prediction of adhesion strength between metal‐polymer interface
Authors: Seo Jaesik , Shin So Young 
Published: October 2023

AbstractThe peel‐off strength of the electroplated specimens exhibits corresponding increase, particularly pronounced in ABS‐rich blends. However, it is observed that the interface displays incomplete contact between the metal and polymer. We suggest a new parameter, the Sdr ratio (Sdr,polymer/Sdr,plating), which provides the prediction of the adhesion strength of the physically interlocked metal‐polymer interface. The change in Sdr ratio effectively reflects the change of peel‐off strength, which is more efficient for phases with increasing ABS content. By examining the relationship between surface morphology and adhesion strength, our research provides the insights into optimizing the adhesion properties of electroplated metal‐polymer interfaces for PC/ABS blend.
A novel ternary mixed‐matrix membrane comprising Pebax‐1657, [HMIM][NTf2] IL, and Al2O3 nanoparticles for efficient CO2 separation
Authors: Mahboubi Reza , Joudaki Ezzatollah , Behbahani Reza Mosayebi , Azizi Navid 
Published: October 2023

AbstractAn innovative technique to efficiently remove CO2 involves introducing a third component with a positive affinity with CO2 into a binary mixed‐matrix membrane (MMM) and eliminating interfacial defects in its structure. In this research, novel ternary MMMs (TMMMs) were synthesized by embedding 1–Hexyl–3–methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][NTf2]) ionic liquid (IL) and aluminum oxide (γ–Al2O3) nanoparticles into poly (ether‐block‐amide) (Pebax‐1657) matrix for enhancing CO2 removal from light gases. FESEM, DSC, ATR‐FTIR, and XRD analyses were used to evaluate the fabricated MMMs structurally. The permeation tests of gases (CH4, N2, and CO2) through prepared membranes were conducted at 25°C and 4, 6, 8, and 10 bar pressures. In accordance with the permeation outcomes, the ternary MMMs exhibited enhanced CO2 separation performances compared to the unloaded polymeric membrane. Also, the optimized MMM comprising 10 wt.% of the IL and 6 wt.% of the nanoparticles obtained a CO2 permeability of 173.90 Barrer, as well as CO2/N2 and CO2/CH4 selectivities of 77.98 and 24.29 at 10 bar and 25°C, which are higher by about 51%, 23%, and 22%, respectively than those of the pristine polymeric membrane. Based on these results, the prepared membrane appears to be a promising choice for separating CO2 from light gases.
Survey response rates in health sciences education research: A 10‐year meta‐analysis
Authors: Wilson Adam B. , Brooks William S. , Edwards Danielle N. , Deaver Jill , Surd Jessica A. , Pirlo Obadiah J. , Byrd William A. , Meyer Edgar R. , Beresheim Amy , Cuskey Stephanie L. , Tsintolas Jack G. , Norrell Eric S. , Fisher Harriet C. , Skaggs Christopher W. , Mysak Dmytro , Levin Samantha R. , Escutia Rosas Carlos E. , Cale Andrew S. , Karim Md Nazmul , Pollock Jenna , Kakos Nicholas J. , O'Brien Monica S. , Lufler Rebecca S. 
Published: October 2023

AbstractGrowth in the online survey market may be increasing response burden and possibly jeopardizing higher response rates. This meta‐analysis evaluated survey trends over one decade (2011–2020) to determine: (1) changes in survey publication rates over time, (2) changes in response rates over time, (3) typical response rates within health sciences education research, (4) the factors influencing survey completion levels, and (5) common gaps in survey methods and outcomes reporting. Study I estimated survey publication trends between 2011 and 2020 using articles published in the top three health sciences education research journals. Study II searched the anatomical sciences education literature across six databases and extracted study/survey features and survey response rates. Time plots and a proportional meta‐analysis were performed. Per 2926 research articles, the annual estimated proportion of studies with survey methodologies has remained constant, with no linear trend (p > 0.050) over time (Study I). Study II reported a pooled absolute response rate of 67% (95% CI = 63.9–69.0) across 360 studies (k), totaling 115,526 distributed surveys. Despite response rate oscillations over time, no significant linear trend (p = 0.995) was detected. Neither survey length, incentives, sponsorship, nor population type affected absolute response rates (p ≥ 0.070). Only 35% (120 of 339) of studies utilizing a Likert scale reported evidence of survey validity. Survey response rates and the prevalence of studies with survey methodologies have remained stable with no linear trends over time. We recommend researchers strive for a typical absolute response rate of 67% or higher and clearly document evidence of survey validity for empirical studies.
Neuere Erfahrungen über die katalytische Ammoniakverbrennung. (Über die katalytischen Vorgänge der technischen Ammoniakoxydation und der Blausäuregewinnung aus Ammoniak und Methan)
Authors: Wendlandt R. 
Published: October 2023

AbstractNach Gegenüberstellung von Vorzügen und Schwierigkeiten der z. Z. vertretenen Anschauungen über den Primärvorgang und die Folgereaktionen der katalytischen Ammoniakoxydation (Nitroxyl‐, Imid‐, Hydroxylamintheorie; Reaktionen mit molekularem oder atomarem Sauerstoff) werden neuerer technische Erfahrungen bezüglich Reaktion und Katalysator zusammengestellt. Mit diesen Unterlagen unter Zuziehung der Literatur wird auch unter technischen Bedingungen eine Entscheidung zu Gunsten eines Primär‐Vorganges mit atomarem Sauerstoff erreicht. Einige neue Aussagen über den Verlauf der Folgereaktionen und das Verhalten von Pt‐Katalysatoren werden begründet. Durch Hinzuziehung neuerer Erfahrungen der Blausäurebildung wird die gewonnene Auffassung bestätigt und ergänzt.
Die Rolle der Oxydationsprodukte bei der Entwicklung. II
Authors: Brauer E. , Staude H. 
Published: October 2023

AbstractEs ist schon seit längerem bekannt, daß bei der photographischen Entwicklung von Oxyphenolen die Oxydationsprodukte der Entwickler eine Verkürzung der Latenzzeit bewirken. Als Ursache hierfür wurde vermutet, daß die Oxydationsprodukte als Adsorptionsvermittler für die eigentlichen Entwicklersubstanzen dienen. Es konnte nun nachgewiesen werden, daß bei sorgfältigem Ausschluß von Sauerstoff an Bromsilber, gleichgültig ob belichtet oder unbelichtet, Hydrochinon weder aus saurer noch aus alkalischer Lösung adsorbiert wird, also auch festes Bromsilber nicht reduzieren kann. Dagegen wird an belichtetes Silberbromid — nicht aber an unbelichtetes — Chinon adsorbiert, das seinerseits imstande ist, etwa zwei Moleküle Hydrochinon pro ein Molekül Chinon zu adsorbieren. Damit ist in diesem Falle die adsorptionsvermittelnde Wirkung des Oxydationsproduktes nachgewiesen. Eine mögliche Deutung dieser Erscheinung und damit des Beginnes der photographischen Entwicklung wird gegeben und Rückschlüsse auf das latente Bild werden gezogen.
Zur Theorie eines Hochfrequenz‐Titrimeters mit Frequenzanzeige
Authors: Huber R. , Cruse K. 
Published: October 2023

AbstractZur Klärung der Wirkungsweise eines H.F.‐Titrimeters und seiner Zelle werden die Leitwerts‐ und DK‐Einflüsse einer Kapazitätszelle im Schwingkreis auf dessen Resonanzfrequenz berechnet. Die Grenzen der Verschiebung des optimalen Konzentrationsbereichs durch Grundfrequenz‐ und Zelländerung werden theoretisch erfaßt und am Experiment belegt. Auf die theoretische Behandlung von Induktionszellen wird hingewiesen.
Feste Gashydrate. VI Die Gitteraufweitungsarbeit
Authors: Stackelberg M. V. , Jahns W. 
Published: October 2023

AbstractEs werden die Struktur und die Gitterkonstanten von einer Anzahl weiterer Hydrate, vor allem organischer Fluoride, bestimmt. Die insgesamt bisher bestimmten Strukturen und Gitterkonstanten werden als Funktion der Durchmesser der Hydratbildnermolekeln dargestellt und diskutiert.Die Arbeit für die Aufweitung des Gitters durch große Hydratbildnermolekeln und die sich hieraus ergebende Stabilitätsverminderung der Hydrate wird berechnet. Die experimentell gefundenen Gitteraufweitungen liegen innerhalb der von der Theorie als zulässig ermittelten Grenze.
Kollagenstruktur und bimodale Koordinationsstatistiken
Authors: Hosemann R. , Weick D. , Vogel W. , Müller N. 
Published: October 2023

AbstractDie Kleinwinkelmeridianreflexe der Röntgendiagramme von nativem Kollagen verschieben sich bei makroskopischer Dehnung der Faser um 10% innerhalb der Meßfehler von 1% nicht. Das kann man dadurch erklären, daß sich die den kohärenten Beugungseffekt erzeugenden Bereiche beim Verstreckungsprozeß lateral gegeneinander verschieben, ohne merklich ihre Quartärstruktur zu ändern. Eine andere Möglichkeit wird diskutiert, daß innerhalb der kohärent streuenden Bereiche während der Dehnung einige Abstände aufgeweitet werden. Um dieses mit dem Experiment in Einklang zu bringen. muß diese Dehnung von einem ganz speziellen, im einzelnen diskutierten Typ sein. Die vorliegenden Dehnungs‐Spannungsmessungen und Kleinwinkelaufnahmen schließen derartige bimodale Längungen im Fall von Kollagen aus.
Palladates of the [NHC⋅H][Pd(NH2)(CC)Cl2] Type as Effective Pre‐catalysts for the Formation of C−C and C−N Bonds
Authors: Ostrowska Sylwia , Czapik Agnieszka , Kwit Marcin , Nolan Steven P. 
Published: October 2023

AbstractThe environmentally friendly, simple synthesis of a family complexes of the general formula [NHC⋅H][Pd(NH2)(CC)Cl2] (CC=biphenyl) is presented. The catalytic activity of these air‐ and moisture‐stable complexes was evaluated as a function of the imidazolium counterion. These pre‐catalysts can be converted, under catalytic conditions, to Pd‐NHC species enabling the Suzuki–Miyaura, Sonogashira, and Buchwald–Hartwig amination reactions under very mild operating conditions.
α‐Methylbenzylamine Functionalized Crown‐Ether‐Appended Calix[4]arene Phase Transfer Catalyst for Enantioselective Henry Reaction
Authors: Malik Apoorva , Sharma Pragati R. , Sharma Rakesh K. 
Published: October 2023

AbstractIn this letter, we designed a highly selective α‐methylbenzylamine functionalized crown‐ether‐appended calix[4]arene derived phase transfer catalyst for asymmetric nitroaldol reaction to provide the desired nitroaldol adducts in high yields (up to 99 % yield) with good to excellent enantioselectivities (up to 99.8 % ee).
Resolution of Expanded Porphyrinoids: A Path to Persistent Chirality and Appealing Chiroptical Properties
Authors: Han Puren , Han Mutian , Sessler Jonathan L. , Lei Chuanhu 
Published: October 2023

AbstractChirality is a fundamental characteristic of nature. Expanded porphyrinoids and their analogues offer an attractive platform for delving into the intricacies of chirality. Expanded porphyrinoids comprise pyrrolic macrocycles and related heterocyclic systems. As a class, expanded porphyrinoids are widely recognized for their flexible structural features, nontrivial coordination capabilities, and intriguing optical and electronic properties. With limited exceptions, their inherent conformational flexibility coupled with a low racemization barrier allows for the facile interchange between enantiomers. As a result, achieving the effective chiral resolution of individual enantiomers and the subsequent exploration of their chiroptical properties represents a significant challenge. This review summarizes strategies used to realize the chiral resolution of expanded porphyrinoids and the understanding of intrinsic chiroptical properties that has emerged from these separation efforts. It is our hope that this review will serve not only to codify our current understanding of chiral expanded porphyrinoids, but also inspire advances in the generalized area of chiral functional materials.
On the Number of π‐Electrons Involved in Stepwise Cycloaddition Reactions
Authors: Inunnguaq Jessen Nicolaj , Izzo Joseph A. , Modlinski Marek S. , Bertuzzi Giulio , Anker Jørgensen Karl 
Published: October 2023

AbstractThe development of higher‐order cycloadditions has mainly been restricted by the requisite usage of highly conjugated and reactive π‐systems. Recent years have witnessed organocatalysis as a potent mediator for several of the challenges associated herein, rendering higher‐order cycloadditions a legitimate option for achieving the selective construction of specific molecular scaffolds. These developments reinvigorate the efforts to try to understand the underlying principles for cycloadditions involving a higher number of π‐electrons than the “classical” cycloadditions; how do we properly address the impact which the addition of further π‐electrons have on the reactivity of a system? Herein, computational investigations of two model higher‐order cycloaddition systems have been performed to try to provide insights on changes in energetic barriers induced by the presence of benzofusions in a position which is unobstructive to the reactivity. With experimental substantiation as support, these studies might open up for a discussion on whether the π‐electrons of benzofused systems simply act as spectator electrons, or play a tangible role on the observed reactivity to an extent where a distinct nomenclature is meritable.
Revealing the Structural Evolution of Electrode/Electrolyte Interphase Formation during Magnesium Plating and Stripping with operando EQCM‐D
Authors: Schick Benjamin W. , Hou Xu , Vanoppen Viktor , Uhl Matthias , Kruck Matthias , Berg Erik J. , Jacob Timo 
Published: October 2023

AbstractRechargeable magnesium batteries could provide future energy storage systems with high energy density. One remaining challenge is the development of electrolytes compatible with the negative Mg electrode, enabling uniform plating and stripping with high Coulombic efficiencies. Often improvements are hindered by a lack of fundamental understanding of processes occurring during cycling, as well as the existence and structure of a formed interphase layer at the electrode/electrolyte interface. Here, a magnesium model electrolyte based on magnesium bis(trifluoromethanesulfonyl)imide (Mg(TFSI)2) and MgCl2 with a borohydride as additive, dissolved in dimethoxyethane (DME), was used to investigate the initial galvanostatic plating and stripping cycles operando using electrochemical quartz crystal microbalance with dissipation monitoring (EQCM‐D). We show that side reactions lead to the formation of an interphase of irreversibly deposited Mg during the initial cycles. EQCM‐D based hydrodynamic spectroscopy reveals the growth of a porous layer during Mg stripping. After the first cycles, the interphase layer is in a dynamic equilibrium between the formation of the layer and its dissolution, resulting in a stable thickness upon further cycling. This study provides operando information of the interphase formation, its changes during cycling and the dynamic behavior, helping to rationally develop future electrolytes and electrode/electrolyte interfaces and interphases.
Examining trait‐like factors as predictors of state‐level responses to food intake in women with bulimia nervosa, purging disorder, and controls
Authors: Fitzgerald Elizabeth H. , Joyner Keanan J. , Keel Pamela K. 
Published: October 2023

AbstractObjectiveTheories suggest that elevated negative affect and weight/shape concerns explain both who is affected by bulimic symptoms as well as when bulimic symptoms occur, suggesting that individual differences predict within‐subject differences. However, few studies have tested this theoretical premise.MethodIn the present study, participants (N = 119) diagnosed with bulimia nervosa (N = 57), purging disorder (N = 31), and non‐eating disorder controls (N = 31) completed measures of negative affect and weight/shape concerns and later made momentary affect and weight/shape concerns ratings before and after an ad lib meal.ResultsState negative affect and weight/shape concerns increased post‐meal. No moderating effect of trait negative affect was observed for state affect. In contrast, between‐subject differences in weight/shape concerns moderated within‐subject increases in state weight/shape concerns. Diagnostic group did not account for this effect.DiscussionFindings point to viable treatment targets for disordered eating. Targeting elevated weight/shape concerns early in interventions could facilitate reductions in purging after food intake for bulimia nervosa and purging disorder.Public SignificanceIn the present study, individual differences in weight/shape concerns at baseline predicted greater increases in state weight/shape concerns following eating. These effects were maintained when considering possible differences related to presence and type of eating disorder. Results suggest that targeting weight/shape concerns earlier in treatment may be important for reducing maladaptive responses to eating across eating disorders.