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정윤석,Andrew S. Cavanagh,Anne C. Dillon,Markus D. Groner,Steven M. George,이세희 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.1
Ultrathin atomic layer deposition (ALD) coatings were found to enhance the performance of lithium-ion batteries (LIBs). Previous studies have demonstrated that LiCoO2 cathode powders coated with metal oxides with thicknesses of ~100-1000 Å grown using wet chemical techniques improved LIB performance. In this study, LiCoO2 powders were coated with conformal Al2O3 ALD films with thicknesses of only ~3-4 Å established using 2 ALD cycles. The coated LiCoO2 powders exhibited a capacity retention of 89% after 120 charge-discharge cycles in the 3.3~4.5 V (vs. Li/Li+) range. In contrast, the bare LiCoO2 powders displayed only a 45% capacity retention. This dramatic improvement may result from the ultrathin Al2O3 ALD film acting to minimize Co dissolution or to reduce surface electrolyte reactions.
Jung, Yoon-S.,Cavanagh, Andrew S.,Dillon, Anne C.,Groner, Markus D.,George, Steven M.,Lee, Se-Hee The Korean Ceramic Society 2010 한국세라믹학회지 Vol.47 No.1
Ultrathin atomic layer deposition (ALD) coatings were found to enhance the performance of lithium-ion batteries (LIBs). Previous studies have demonstrated that $LiCoO_2$ cathode powders coated with metal oxides with thicknesses of $\sim100-1000{\AA}$ grown using wet chemical techniques improved LIB performance. In this study, $LiCoO_2$ powders were coated with conformal $Al_2O_3$ ALD films with thicknesses of only $\sim3-4{\AA}$ established using 2 ALD cycles. The coated $LiCoO_2$ powders exhibited a capacity retention of 89% after 120 charge-discharge cycles in the 3.3~4.5 V (vs. $Li/Li^+$) range. In contrast, the bare $LiCoO_2$ powders displayed only a 45% capacity retention. This dramatic improvement may result from the ultrathin $Al_2O_3$ ALD film acting to minimize Co dissolution or to reduce surface electrolyte reactions.
Antibacterial Activity of 13 Honeys Against Escherichia coli and Pseudomonas aeruginosa
Jenny M. Wilkinson,Heather M.A. Cavanagh 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.1
In this study the activity of 13 honeys, including three commercial antibacterial honeys, against Escherichiacoli and Pseudomonas aeruginosawas determined. Antibacterial activity of the honeys was assayed using standard well dif-fusion methods. All honeys, and an artificial honey, were tested at four concentrations (10%, 5%, 2.5%, and 1% wt/vol) againstE. coliand P. aeruginosa,and zones of inhibition were measured. All honeys tested had an inhibitory effect on the growthof E. coliand P. aeruginosa,with one honey still having activity against E. coliand three having activity against P. aerugi-nosa at 2.5%. No honey was active at 1% concentrations. E. coliwas more susceptible to inhibition by the honeys used inthis study than was P. aeruginosa. In this study we have demonstrated that several honeys, in addition to commercial an-tibacterial honeys, can inhibit E. coliand P. aeruginosaand may have potential as therapeutic honeys.
Antibacterial Activity of Berry Fruits Used for Culinary Purposes
Jenny M. Wilkinson,Heather M.A. Cavanagh,Michael Hipwell 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.1
Increasing interest in the health benefits of various culinary berries has led to investigationof their antibacterial activity. Commercial raspberry, blackcurrant, cranberry, and blackberrycordials (10% fruit) as well as fresh berries were assessed for their ability to inhibit thegrowth of various bacteria and the yeast Candida albicans . Thre of the six raspberry cordialsand the blackcurrant cordial inhibited all 12 bacteria and C. albicans at dilutions of 1:5. Bac-teria showed varying susceptibilities to the remaining cordials. All cordials inhibited thegrowth of Mycobacterium phlei . Of the fresh berries, mulberries and boysenberries did notinhibit any bacteria, and the remaing berries inhibited the growth of varying numbers ofbacteria. There was no correlation betwen gram-positive or gram-negative bacterial statusand susceptibility to the berries. It is suggested that the antibacterial activity of these berriesmay be of benefit as a means of water purification for suspect water suplies or to enhanceshelf life when incorporated into food products.57
Kang, Eunae,Jung, Yoon Seok,Cavanagh, Andrew S.,Kim, Gi‐,Heon,George, Steven M.,Dillon, Anne C.,Kim, Jin Kon,Lee, Jinwoo WILEY‐VCH Verlag 2011 Advanced Functional Materials Vol.21 No.13
<P><B>Abstract</B></P><P>Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystals confined in mesocellular carbon foam (MSU‐F‐C) are synthesized by a <B>“</B>host–guest<B>”</B> approach and tested as an anode material for lithium‐ion batteries (LIBs). Briefly, an iron oxide precursor, Fe(NO<SUB>3</SUB>)<SUB>3</SUB>·9H<SUB>2</SUB>O, is impregnated in MSU‐F‐C having uniform cellular pores ∼30 nm in diameter, followed by heat‐treatment at 400 °C for 4 h under Ar. Magnetite Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystals with sizes between 13–27 nm are then successfully fabricated inside the pores of the MSU‐F‐C, as confirmed by transmission electron microscopy (TEM), dark‐field scanning transmission electron microscopy (STEM), energy dispersive X‐ray spectroscopy (EDS), X‐ray diffraction (XRD), and nitrogen sorption isotherms. The presence of the carbon most likely allows for reduction of some of the Fe<SUP>3+</SUP> ions to Fe<SUP>2+</SUP> ions via a carbothermoreduction process. A Fe<SUB>3</SUB>O<SUB>4</SUB>/MSU‐F‐C nanocomposite with 45 wt% Fe<SUB>3</SUB>O<SUB>4</SUB> exhibited a first charge capacity of 1007 mA h g<SUP>−1</SUP> (Li<SUP>+</SUP> extraction) at 0.1 A g<SUP>−1</SUP> (∼0.1 C rate) with 111% capacity retention at the 150<SUP>th</SUP> cycle, and retained 37% capacity at 7 A g<SUP>−1</SUP> (∼7 C rate). Because the three dimensionally interconnected open pores are larger than the average nanosized Fe<SUB>3</SUB>O<SUB>4</SUB> particles, the large volume expansion of Fe<SUB>3</SUB>O<SUB>4</SUB> upon Li‐insertion is easily accommodated inside the pores, resulting in excellent electrochemical performance as a LIB anode. Furthermore, when an ultrathin Al<SUB>2</SUB>O<SUB>3</SUB> layer (<4 Å) was deposited on the composite anode using atomic layer deposition (ALD), the durability, rate capability and undesirable side reactions are significantly improved.</P>