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Oleshko, Vladimir P.,Kim, Jenny,Schaefer, Jennifer L.,Hudson, Steven D.,Soles, Christopher L.,Simmonds, Adam G.,Griebel, Jared J.,Glass, Richard S.,Char, Kookheon,Pyun, Jeffrey Cambridge University Press (Materials Research Soc 2015 MRS Communications Vol.5 No.3
<▼1><B>Abstract</B><P/></▼1><▼2><P>Poly[sulfur-random-1,3-diisopropenylbenzene (DIB)] copolymers synthesized via inverse vulcanization form electrochemically active polymers used as cathodes for high-energy density Li-S batteries, capable of enhanced capacity retention (1005 mAh/g at 100 cycles) and lifetimes of over 500 cycles. In this prospective, we demonstrate how analytical electron microscopy can be employed as a powerful tool to explore the origins of the enhanced capacity retention. We analyze morphological and compositional features when the copolymers, with DIB contents up to 50% by mass, are blended with carbon nanoparticles. Replacing the elemental sulfur with the copolymers improves the compatibility and interfacial contact between active sulfur compounds and conductive carbons. There also appears to be improvements of the cathode mechanical stability that leads to less cracking but preserving porosity. This compatibilization scheme through stabilized organosulfur copolymers represents an alternative strategy to the nanoscale encapsulation schemes which are often used to improve the cycle life in high-energy density Li-S batteries.</P></▼2>
Lee, Sung-Il,Schö,mer, Martina,Peng, Huagen,Page, Kirt A.,Wilms, Daniel,Frey, Holger,Soles, Christopher L.,Yoon, Do Y. American Chemical Society 2011 Chemistry of materials Vol.23 No.11
<P>Poly(ethylene oxide)s with varying degrees of hyperbranching are effective at preventing the crystallization of PEO and lead to approximately a 100-fold increase in the Li-ion conductivity below 50 °C as compared with linear PEO. The Li-ion conductivities, which increase further upon permethylation of the hydroxyl termini, are found to correlate quantitatively with the fast segmental dynamics of PEO as measured by inelastic neutron scattering.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2011/cmatex.2011.23.issue-11/cm103696g/production/images/medium/cm-2010-03696g_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm103696g'>ACS Electronic Supporting Info</A></P>
Dirlam, Philip T.,Park, Jungjin,Simmonds, Adam G.,Domanik, Kenneth,Arrington, Clay B.,Schaefer, Jennifer L.,Oleshko, Vladimir P.,Kleine, Tristan S.,Char, Kookheon,Glass, Richard S.,Soles, Christopher American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.21
<P>The practical implementation of Li-S technology has been hindered by short cycle life and poor rate capability owing to deleterious effects resulting from the varied solubilities of different Li polysulfide redox products. Here, we report the preparation and utilization of composites with a sulfur-rich matrix and molybdenum disulfide (MoS2) particulate inclusions as Li-S cathode materials with the capability to mitigate the dissolution of the Li polysulfide redox products via the MoS2 inclusions acting as 'polysulfide anchors'. In situ composite formation was completed via a facile, one-pot method with commercially available starting materials. The composites were afforded by first dispersing MoS2 directly in liquid elemental sulfur (S-8) with sequential polymerization of the sulfur phase via thermal ring opening polymerization or copolymerization via inverse vulcanization. For the practical utility of this system to be highlighted, it was demonstrated, that the composite formation methodology was amenable to larger scale processes with composites easily prepared in 100 g batches. Cathodes fabricated with the high sulfur content composites as the active material afforded Li-S cells that exhibited extended cycle lifetimes of up to 1000 cycles with low capacity decay (0.07% per cycle) and demonstrated exceptional rate capability with the delivery of reversible capacity up to 500 mAh/g at 5 C.</P>
Self-Sealing of Nanoporous Low Dielectric Constant Patterns Fabricated by Nanoimprint Lithography
Ro, Hyun Wook,Peng, Huagen,Niihara, Ken-ichi,Lee, Hae-Jeong,Lin, Eric K.,Karim, Alamgir,Gidley, David W.,Jinnai, Hiroshi,Yoon, Do Y.,Soles, Christopher L. WILEY-VCH Verlag 2008 ADVANCED MATERIALS Vol.20 No.10
<B>Graphic Abstract</B> <P>The cross-sectional TEM image shows that line-space patterns can be directly imprinted, with high fidelity, into highly porous spin-on organosilicate materials. This publication quantifies how the porosity and distribution of pores within the patterns are affected by the nanoimprint lithography processes, including evidence for a densified pattern surface. <img src='wiley_img/09359648-2008-20-10-ADMA200701994-content.gif' alt='wiley_img/09359648-2008-20-10-ADMA200701994-content'> </P>
Carcass and Meat Quality Traits in an Embden×Toulouse Goose Cross Raised in Organic Dehesa
Sole, M.,Pena, F.,Domenech, V.,Clemente, I.,Polvillo, O.,Valera, M.,Verona, J.C.,Rubi, M.,Molina, A. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.6
This study assessed the influence of genetic type (Embden-Anser anser, EE; Toulouse-Anser anser, TT and F1 cross, ET) for meat characteristics (carcass, meat quality and fatty acid (FA) profiles), of domestic geese "Anser anser domesticus" raised in dehesa as an alternative, organic feeding system. Carcass and breast muscle weight (p<0.01) were greater for the ET group at the same live weight. None of the groups showed differences in the production of fatty liver with this type of feeding. Higher values were found for maximum Warner-Bratzler shear force (between 7.62 and $8.87kg/cm^2$), which implies the improvement of this parameter. High levels of oleic FAs were obtained, especially for the TT group. The polyunsaturated/saturated FA ratio was highest for the ET group (p<0.001), reflecting the optimum nutritional values as a component of a healthy consumer diet.
( Solee Kim ),( Young Chai Kim ),( Seong Geun Oh ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.3
The effects of the zinc oxide (ZnO) preparing process on the performance of inverted organic photovoltaic cells (OPVs) were explored. The morphology and size of ZnO nanoparticles were controlled, leading to more efficient charge collection from device and higher electron mobility compared with nanospheres. Nanosized ZnO particles were synthesized by using zinc acetate dihydrate and potassium hydroxide in methanol. Also, water was added into the reaction medium to control the morphology of ZnO nanocrystals from spherical particles to rods, and NH4OH was used to prevent the gelation of dispersion. Solution-processed ZnO thin films were deposited onto the ITO/glass substrate by using spin coating process and then ZnO films were used as an electron transport layer in inverted organic photovoltaic cells. The analyses were carried out by using TEM, FE-SEM, AFM, DLS, UV-Vis spectroscopy, current density voltage characteristics and solar simulator.
특징적 단어 및 이모티콘 집합을 활용한 모바일 기기 내 성별 예측 프레임워크
김소이(Solee Kim),최예림(Yerim Choi),김윤정(Yoonjung Kim),박규연(Kyuyon Park),박종헌(Jonghun Park) 한국정보과학회 2015 정보과학회 컴퓨팅의 실제 논문지 Vol.21 No.11
사용자의 인구통계학적 정보는 추천 시스템과 같은 개인화 서비스 발달에 도움이 되며, 모바일 사용 데이터는 사용자의 인구통계학적 정보 예측에 활용될 수 있다. 특히 텍스트 데이터는 성별 예측에 효과적인 것으로 알려져 있지만, 모바일 텍스트 데이터는 프라이버시 이슈가 존재하여 그 활용이 제한되고 있다. 본 연구에서는 디바이스 내 예측 방법론을 제안하여 모바일 텍스트 데이터를 사용하면서 프라이버시 이슈를 최소화는 동시에 사용자의 성별을 효과적으로 예측하고자 한다. 우선, 성별에 따른 특징이 반영된 웹문서를 수집하여 각 성별에 따른 특징적 단어 집합과 특징적 이모티콘 집합을 구성한다. 단어 집합과 이모티콘 집합을 디바이스 내에서 사용자의 모바일 데이터와 비교하여 성별을 각각 예측하고, 두 예측 결과를 앙상블하여 최종적인 성별 예측 결과를 도출한다. 피실험자들의 모바일 텍스트 데이터를 사용하여 성별 예측 실험을 수행하였으며 제안 방법론의 우수한 성능을 확인하였다. User demographic information is necessary in order to improve the quality of personalized services such as recommendation systems. Mobile data, especially text data, is known to be effective for prediction of user demographic information. However, mobile text data has privacy issues so that its utilization is limited. In this regard, we introduce an on-device gender prediction framework utilizing mobile text data while minimizing the privacy issue. Discriminative word and emoticon sets of each gender are constructed from web documents written by authors of each gender. After gender prediction is performed by comparing discriminative word and emoticon sets with a user"s mobile text data, an ensemble method that combines two prediction results draws a final result. From experiments conducted on real-world mobile text data, the proposed on-device framework shows promising results for gender prediction.