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Polymer donors with hydrophilic side-chains enabling efficient and thermally-stable polymer solar cells by non-halogenated solvent processing

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Nano Research Energy 2024年第1期3卷 19-29页

作者： Soodeok seo Jun-Young Park Jin Su Park seungjin Lee Do-Yeong choi Yun-Hi Kim Bumjoon J.Kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Materials Engineering and Convergence Technology and ERI Gyeongsang National UniversityJinju 52828Republic of Korea Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea Department of Chemistry and ERI Gyeongsang National UniversityJinju 52828Republic of Korea

Polymer solar cells(PSCs)with high power conversion efficiency(PCE)and environment-friendly fabrication are the main requirements enabling their production in industrial *** the use of non-halogenated solvent processing is inevitable for the PSC fabrication,it significantly reduces the processability of polymer donors(PDS)and small-molecule acceptors(SMAs).This often results in unoptimized blend morphology and limits the device *** address this issue,hydrophilic oligoethylene glycol(OEG)side-chains are introduced into a PD(2EG)to enhance the molecular compatibility between the PD and L8-BO *** 2EG PD induces higher crystallinity and alleviates phase separation with the SMA compared to the reference PD(PM7)with hydrocarbon ***,the 2EG-based PSCs exhibit a higher PCE(15.8%)than the PM7-based PSCs(PCE=14.4%)in the ortho-xylene based ***,benefitted from the reduced phase separation and increased crystallinity of 2EG PDS,the 2EG-based PSCs show enhanced thermal stability(84%of initial PCE after 120 h heating)compared to that of the PM7-based PSCs(60%of initial PCE after 120 h heating).This study demonstrates the potential of OEG side-chain-incorporated materials in developing efficient,stable,and eco-friendly PSCs.

关键词： polymer solar cell polymer donor OEG side-chain non-halogenated solvent process side-chain engineering

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Journal of Materials Science & Technology 2022年第16期111卷 99-110页

作者： Vioni Dwi Sartika Won seok choi Gwanghyo choi Jaewook Han Sung-Jin Chang Won-seok Ko Blazej Grabowski Pyuck-Pa choi Department of Materials Science and Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Gangwon Regional Division Korea Institute of Industrial TechnologyGangwon 25440Republic of Korea Division of Measurement and Analysis National Nanofab CenterDaejeon 34141Republic of Korea School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany

We report laser cladding of pure titanium on a CoCrMo alloy using directed energy *** electron microscopy,the microstructural evolution upon varying the process parameters,especially laser power and powder feed rate,was investigated in relation to crack *** layers showing dilution rates of more than 5%contained cracks due to the formation of the brittle Co_(2)Ti intermetallic *** observed cracks could be ascribed to a mismatch in thermal expansion and a resulting stress of more than 440 MPa acting on the Co_(2)Ti phase,as determined by density functional theory and ***,an excess laser energy caused chemical inhomogeneity and unmelted Ti powder particles,while a deficient laser energy resulted in a lack of *** cracks nor partially melted powders were observed for a powder feed rate of 3 g/min and a laser power of 225–300 W,for which the dilution rate was minimized to less than 5%.For such samples,the cladding layers comprised pureα-Ti and a uniform CoT i interface with Co_(2)Ti islands.

关键词： Additive manufacturing Dissimilar metal joining Titanium Cobalt-based alloy

Ectopic peritoneal paragonimiasis mimicking tuberculous peritonitis:A care report

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World Journal of Clinical Cases 2022年第16期10卷 5359-5364页

作者： Jung Woo choi Chang Min Lee seong Je Kim se In Hah Ji Yoon Kwak Hyun Chin Cho Chang Yoon Ha Woon Tae Jung Ok Jae Lee Department of Internal Medicine Gyeongsang National University College of Medicine and Gyeongsang National University HospitalJinju 52727South Korea Institute of Health Sciences Gyeongsang National UniversityJinju 52828South Korea

BACKGROUND The most common site of paragonimiasis is in the *** migratory route passes through the duodenal wall,peritoneum,and diaphragm to the lungs;thus,the thoracic cavity and central nervous system,as well as the liver,intestine,and abdominal cavity may be ***,we present a case of intraperitoneal paragonimiasis without other organ involvement,mimicking tuberculous *** SUMMARY A 57-year-old man presented with recurrent abdominal pain for 4 *** examination revealed tenderness in the right lower *** findings showed complete blood counts within the normal range without *** reactive lymph nodes and diffuse peritoneal infiltration were noted on abdominal computed tomography(CT).There were no abnormalities on chest CT or *** findings of diagnostic laparoscopy for the differential diagnosis of tuberculous peritonitis and peritoneal carcinomatosis included multiple small whitish nodules and an abscess in the *** reports confirmed the presence of numerous eggs of Paragonimus westermani(***).A postoperative serum enzyme-linked immunosorbent assay revealed *** *** and repetitive history-taking led him to retrospectively recall the consumption of freshwater *** 3 d of treatment with praziquantel(1800 mg;25 mg/kg),he recovered from all *** In patients who require diagnostic laparoscopy for the differential diagnosis of tuberculous peritonitis and peritoneal carcinomatosis,repetitive history-taking and preoperative serologic antibody tests against Paragonimus may be helpful in diagnosing intraperitoneal paragonimiasis without other organ involvement.

关键词： Differential diagnoses Intraperitoneal abscess Paragonimiasis Paragonimus westermani Peritonitis Tuberculosis Case report

Ex situ aging effect on sulfonated poly(ether ether ketone) membrane:Hydration-dehydration cycling and hydrothermal treatment

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Journal of Energy Chemistry 2022年第7期31卷 583-592,I0014页

作者： seung-Young choi Kyeong Sik Jin Polymer&Materials Chemistry Department of ChemistryLund UniversitySE-22100Sweden Center for Hydrogen·Fuel Cell Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Pohang Accelerator Laboratory Pohang University of Science and Technology(POSTECH)PohangKyungbuk 37673Republic of Korea

Prolonged hydrothermal treatment for sulfonated poly(ether ether ketone) membranes induces mechanical degradation and developing hydrophilic-hydrophobic phase separation, simultaneously. The enhanced phase separation provides incremental proton conductivity to the membranes, whereas mechanical degradation drastically reduces device stability. On this basis, we describe here the effects of two different ex situ aging processes on sulfonated poly(ether ether ketone) membranes: hydrationdehydration cycling and prolonged hydrothermal treatment. Both aged membranes exhibited enhanced phase separation under the hydrated conditions, as characterized by small angle X-ray ***, when the aged membranes were dried again, the nanostructure of the membranes aged via the hydration-dehydration cycling was recoverable, whereas that of the membranes aged via prolonged hydrothermal treatment was irreversible. Furthermore, the two differently aged membranes showed clear differences in thermal, mechanical, and electrochemical properties. Finally, we implemented both aged membranes in fuel cell application. The sample aged via hydration-dehydration cycling maintained its improved cell performance, whereas the sample aged via hydrothermal treatment showed drastically reduced cell performance after durability test for 50 h.

关键词： Sulfonated poly(ether ether ketone) Humidity cycle test Ex situ aging Proton exchange membrane Fuel cell

Factors Influencing Compliance with Safe Handling Requirements of Anticancer Agents by Nurses in a Tertiary Hospital-A secondary Publication

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Journal of Clinical and Nursing Research 2024年第1期8卷 196-208页

作者： seul Gi Lee So-Young choi Department of Nursing Gyeongsang National University HospitalJinju 52727Korea College of Nursing Gyeongsang National UniversityJinju 52727Korea

Purpose:This research aimed to identify leading factors that affect nurses’compliance with the safe handling of anticancer ***:Data were collected from 114 nurses working in the university hospital and were analyzed through independent t-test,one-way ANOVA,Pearson’s correlation coefficient,and multiple regression analysis using ***:The average level of compliance with the safe handling of anticancer agents was 3.73±0.33 out of 5 *** safety culture(β=0.40,Pses’compliance with the safe handling of anticancer *** explained variance for compliance was 28.3%.Conclusion:To enhance the implementation of safety management for anticancer agents,each institution should strive to support human and material resources and enhance specialization in the workplace safety culture through system *** on the results of this study,we suggest research for the development of a training program for anticancer agent safety management.

关键词： Anticancer agents Compliance Knowledge Nurse Safety

Distinctive differences in the granulation of saline and non-saline enriched anaerobic ammonia oxidizing(AMX)bacteria

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Journal of Environmental Sciences 2022年第12期34卷 162-173页

作者： Victory Fiifi Dsane Sumin An Younggyun choi Department of Environmental Engineering Chungnam National UniversityDaejeon 305-764Korea Department of Food Process Engineering University of GhanaLegonGhana Department of Environmental&IT Convergence Engineering Chungnam National UniversityDaejeon 305-764Korea

The growing interest in the anaerobic ammonium oxidizing(AMX)process in treating high nitrogen containing wastewaters and a comprehensive study into the granulation mechanism of these bacteria under diverse environmental conditions over the years have been *** this effect,the distinctive differences in saline adapted AMX(S_AMX)and nonsaline adapted AMX(NS_AMX)granules are presented in this *** was observed that substrate utilisation profiles,granule formation mechanism,and pace towards granulation differed marginally for the two adaptation *** different microbial dominant aggregation types aided in splitting the 471 days operated lab-scale SBRs into three distinct *** both reactors,phase III(granules dominant phase)showed the highest average nitrogen removal efficiency of 87.9%±4.8%and 85.6%±3.6%for the S_AMX and NS_AMX processes,*** extracellular polymeric substances(EPS)quantity and major composition determined its role either as a binding agent in granulation or a survival mechanism in saline *** was also observed that granules of the S_AMX reactor were mostly loosely and less condensed aggregates of smaller sub-units and flocs while those of the NS_AMX reactor were compact *** ionic gradient in saline enrichment led to an increased activity of the Na^(+)/K^(+)–ATPase,hence enriched granules produced higher cellular adenosine triphosphate molecules which finally improved the granules active biomass ratio by 32.96%.Microbial community showed that about three to four major known AMX species made up the granules consortia in both *** and expression of functional genes differed for these different species.

关键词： AMX Granulation EPS Enrichment Na^(+)/K^(+)-ATPase

Location privacy protection of maritime mobile terminals

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Digital Communications and Networks 2022年第6期8卷 932-941页

作者： Xin Su Su Jiang Dongmin choi College of IOT Engineering Hohai UniversityChangzhou213022China Division of Undeclared Majors Chosun UniversityRepublic of Korea

Mobile Edge Computing(MEC)can support various high-reliability and low-delay applications in Maritime Networks(MNs).However,security risks in computing task offloading *** this study,the location privacy leakage risk of Maritime Mobile Terminals(MMTs)is quantified during task offloading and relevant Location Privacy Protection(LPP)schemes of MMT are considered under two kinds of task offloading *** single-MMT and single-time offloading scenario,a dynamic cache and spatial cloaking-based LPP(DS-CLP)algorithm is proposed;and under the multi-MMTs and multi-time offloading scenario,a pseudonym and alterable silent period-based LPP(PA-SLP)strategy is *** results show that the DS-CLP can save the response time and communication cost compared with traditional algorithms while protecting the MMT location ***,extending the alterable silent period,increasing the number of MMTs in the maritime area or improving the pseudonym update probability can enhance the LPP effect of MMTs in ***,the study results can be effectively applied to MNs with poor communication environments and relatively insufficient computing resources.

关键词： Location privacy protection Maritime network Mobile edge computing Task floading

Development of a potential PET probe for HDAC6 imaging in Alzheimer's disease

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Acta Pharmaceutica Sinica B 2022年第10期12卷 3891-3904页

作者： Ping Bai Prasenjit Mondal Frederick A.Bagdasarian Nisha Rani Yan Liu Ashley Gomm Darcy R.Tocci se Hoon choi Hsiao-Ying Wey Rudolph E.Tanzi Can Zhang Changning Wang Athinoula A.Martinos Center for Biomedical Imaging Department of RadiologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA 02129USA Genetics and Aging Research Unit McCance Center for Brain HealthMassGeneral Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolCharlestownMA 02129USA

Although the epigenetic regulatory protein histone deacetylase 6(HDAC6)has been recently implicated in the etiology of Alzheimer’s disease(AD),little is known about the role of HDAC6 in the etiopathogenesis of AD and whether HDAC6 can be a potential therapeutic target for ***,we performed positron emission tomography(PET)imaging in combination with histopathological analysis to better understand the underlying pathomechanisms of HDAC6 in *** first developed[^(18)F]PB118 which was demonstrated as a valid HDAC6 radioligand with excellent brain penetration and high specificity to *** studies of[^(18)F]PB118 in 5xFAD mice showed significantly increased radioactivity in the brain compared to WT animals,with more pronounced changes identified in the cortex and *** translatability of this radiotracer for AD in a potential human use was supported by additional studies,including similar uptake profiles in non-human primates,an increase of HDAC6 in ADrelated human postmortem hippocampal tissues by Western blotting protein analysis,and our ex vivo histopathological analysis of HDAC6 in postmortem brain tissues of our ***,our findings show that HDAC6 may lead to AD by mechanisms that tend to affect brain regions particularly susceptible to AD through an association with amyloid pathology.

关键词： HDAC6 Alzheimer’s disease Radiotracer PET imaging Epigenetic

High-Performance Perovskite Quantum Dot Solar Cells Enabled by Incorporation with Dimensionally Engineered Organic semiconductor

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Nano-Micro Letters 2022年第12期14卷 272-285页

作者： seyeong Lim Dae Hwan Lee Hyuntae choi Yelim choi Dong Geon Lee Sung Beom Cho seonkyung Ko Jongmin choi Younghoon Kim Taiho Park Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea Center of Materials Digitalization Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Materials Science and Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea

Perovskite quantum dots(PQDs)have been considered promising and effective photovoltaic absorber due to their superior optoelectronic properties and inherent material merits combining perovskites and ***,they exhibit low moisture stability at room humidity(20-30%)owing to many surface defect sites generated by inefficient ligand exchange *** surface traps must be re-passivated to improve both charge transport ability and moisture *** address this issue,PQD-organic semiconductor hybrid solar cells with suitable electrical properties and functional groups might dramatically improve the charge extraction and defect *** organic semiconductors are typically low-dimensional(1D and 2D)and prone to excessive self-aggregation,which limits chemical interaction with *** this work,we designed a new 3D star-shaped semiconducting material(Star-TrCN)to enhance the compatibility with *** robust bonding with Star-TrCN and PQDs is demonstrated by theoretical modeling and experimental *** Star-TrCN-PQD hybrid films show improved cubic-phase stability of CsPbI_(3)-PQDs via reduced surface trap states and suppressed moisture *** a result,the resultant devices not only achieve remarkable device stability over 1000 h at 20-30%relative humidity,but also boost power conversion efficiency up to 16.0%via forming a cascade energy band structure.

关键词： CsPbI3 quantum dots Star-shaped organic semiconductors Hybrid perovskite quantum dots Solar cell stability High-efficiency photovoltaics