SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WAKA:ref ;pers:(Liu Johan 1960)"

Sökning: WAKA:ref > Liu Johan 1960

  • Resultat 51-60 av 511
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
51.
  •  
52.
  • Carlberg, Björn, 1983, et al. (författare)
  • Surface-Confined Synthesis of Silver Nanoparticle Composite Coating on Electrospun Polyimide Nanofibers
  • 2011
  • Ingår i: Small. - : Wiley. - 1613-6810 .- 1613-6829. ; 7:21, s. 3057-3066
  • Tidskriftsartikel (refereegranskat)abstract
    • A methodology for fabricating hierarchical nanostructures by surface-confined synthesis of silver nanoparticles on electrospun polyimide nanofibers is reported. Through surface-confined imide cleavage at the dianhydride domain via immersion in an aqueous KOH solution, potassium polyamate coatings of accurately defined thickness are formed (at a rate of 25 nm h(-1)). By utilizing the ion-exchange capability of the polyamate resin, silver ions are introduced through immersion in an aqueous AgNO(3) solution. Subsequent reduction of the metal ion species leads to the formation of nanoparticles at the fiber surface. Two modes of reduction, chemical and thermal, are investigated in the report, each leading to distinct morphologies of the nanoparticle coatings. Via thermal reduction, a composite surface layer consisting of monodisperse silver nanoparticles (average diameter 5.2 nm) embedded in a re-imidized polyimide matrix is achieved. In the case of chemical reduction, the reduction process occurs preferentially at the surface of the fiber, leading to the formation of silver nanoparticles anchored at the surface, though not embedded, in a polyamic acid matrix. By regulating the modification depth, control of the particle density on the fiber surface is established. In both reduction approaches, the polyimide nanofiber core exhibits maintained integrity.
  •  
53.
  • Casa, Marcello, et al. (författare)
  • Conductive adhesive based on mussel-inspired graphene decoration with silver nanoparticles
  • 2018
  • Ingår i: Journal of Nanoscience and Nanotechnology. - : American Scientific Publishers. - 1533-4880. ; 18:2, s. 1176-1185
  • Tidskriftsartikel (refereegranskat)abstract
    • Decoration with silver nanoparticles was obtained by coating graphene with a polydopamine layer, able to induce spontaneous metallic nanoparticles formation without any specific chemical interfacial modifier, neither using complex instrumentation. The choice of dopamine was inspired by the composition of adhesive proteins in mussels, related to their robust attach to solid surfaces. The synthesis procedure started from graphite and involved eco-friendly compounds, such as Vitamin C and glucose as reducing agent and water as reaction medium. Silver decorated graphene was inserted as secondary nanofiller in the formulation of a reference conductive adhesive based on epoxy resin and silver flakes. A wide characterization of the intermediate materials obtained along the step procedure for the adhesive preparation was carried out by several techniques. We have found that the presence of nanofiller yields, in addition to an improvement of the thermal conductivity (up to 7.6 W/m· K), a dramatic enhancement of the electrical conductivity of the adhesive. In particular, starting from 3 · 10 2 S/cm of the reference adhesive, we obtained a value of 4 · 10 4 S/cm at a nanofiller concentration of 11.5 wt%. The combined double filler conductivity was evaluated by Zallen’s model. The effect of the temperature on the resistivity of the adhesive has been also studied.
  •  
54.
  • Casa, Marcello, et al. (författare)
  • Development and characterization of graphene-enhanced thermal conductive adhesives
  • 2014
  • Ingår i: 15th International Conference on Electronic Packaging Technology, ICEPT 2014; Wangjiang HotelChengdu; China; 12 August 2014 through 15 August 2014. - 9781479947072 ; :Art. no. 6922700, s. 480-483
  • Konferensbidrag (refereegranskat)abstract
    • According to Moore's Laws, complexity and power densities of electronic devices are increased during the last decades, moreover their dimensions are shrinking to nanometers causing hot-spot temperature escalation. Thermal management, therefore, becomes a critical issue for next generation of electronics. This scenario motivates development of novel thermal conductive adhesive (TCA) with enhanced thermal conductivity. Conventional TCAs use polymers as the matrix (base material) and utilize large loading weight fraction of the filler, usually silver particles, to achieve the thermal conductivity of 1-4 W/ m K at room temperature [1]. Lately it was discovered that graphene exhibit superior thermal conductivity [2] even when they are incorporated with matrix materials [3], which offers a potential to develop high thermal conductive graphene-filled compound. In this paper, a new functionalized graphene and its filled TCA have been developed and characterized. Starting from pristine graphite flakes, graphene was prepared through chemical exfoliation and functionalized with a nano silver layer to form a special metal/graphene hybrid material. Moreover, an efficient method to uniformly disperse the nano-scaled graphene hybrid material in silver-epoxy matrix was developed. Cross-section view of SEM has shown a homogeneous component structure, and TGA analysis of hybrid material is given. The developed compound is based on a commercial TCA which is composed with epoxy matrix and micro-sized Ag flakes. Thermal characterization through Laser-flash equipment has indicated that a significant thermal conductivity improvement was achieved through adding functionalized graphene into the material. Different TCA samples with different weight percentages of functionalized graphene ranging from 0 % (reference) to 11.5 % were prepared and tested to study thermal conductivity change. Data show that a thermal conductivity value of 7.6 W/ m K is reached when the graphene/silver percentage is 11.5 % that is almost 4 times higher than our reference.
  •  
55.
  • Casa, Marcello, et al. (författare)
  • Silver decorated graphene-polyvinyl alcohol hybrid hydrogel as catalyst for benzonitrile conversion
  • 2017
  • Ingår i: Advanced Science Letters. - : American Scientific Publishers. - 1936-7317 .- 1936-6612. ; 23:6, s. 5980-5983
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work, we have synthetized a reduced graphene oxide functionalized with silver nanoparticles (G/Ag) by a method developed in our previous study and incorporated it in a hydrogel based on polyvinyl alcohol (PVA) as gelator through a freezing/thawing method. The hydrogel has been tested to catalyze the reduction at room temperature of nitrile group of benzonitrile in water by using glucose as a natural and mild reducing agent.
  •  
56.
  •  
57.
  • Chen, Jiajia, et al. (författare)
  • Characterization of Longitudinal Thermal Conductivity of Graphene Film
  • 2021
  • Ingår i: 2021 22nd International Conference on Electronic Packaging Technology, ICEPT 2021.
  • Konferensbidrag (refereegranskat)abstract
    • The chase of high performance by chip manufacturers has greatly increased the power consumption of integrated circuits, which brings great challenges to the heat dissipation of electronics systems. It has also slowed down following up of the Moore's Law, and it is expected to hit the wall soon [1]. Graphene film with high in-plane thermal conductivity is one of the key materials to make it possible for electronics industry to continue to follow the Moore's Law. However, there are few studies focusing on the longitudinal thermal conductivity of graphene films. The purpose of this study is to investigate the longitudinal thermal conductivity of graphene films according to ASTM D5470 [2]. The results show that the longitudinal thermal conductivity of the pressed graphene film is greater than that of the unpressurized graphene film. The longitudinal thermal conductivity is 10.6 W/m· K for the unpressurized graphene film and 20.6 W/m· K for the pressed graphene film.
  •  
58.
  •  
59.
  •  
60.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 51-60 av 511
Typ av publikation
konferensbidrag (311)
tidskriftsartikel (192)
forskningsöversikt (8)
Typ av innehåll
refereegranskat (511)
Författare/redaktör
Fu, Yifeng, 1984 (93)
Ye, L (68)
Andersson, Cristina, ... (42)
Wang, Teng, 1983 (41)
Zhang, Yong, 1982 (37)
visa fler...
Ye, Lilei (37)
Cheng, Zhaonian, 194 ... (36)
Lai, Zonghe, 1948 (34)
Lu, Xiuzhen (34)
Jeppson, Kjell, 1947 (31)
Zhang, Yan, 1976 (29)
Wang, Nan, 1988 (28)
Zhang, Yan (27)
Zandén, Carl, 1984 (26)
Sun, Shuangxi, 1986 (25)
Jiang, Di, 1983 (25)
Edwards, Michael, 19 ... (23)
Carlberg, Björn, 198 ... (23)
Zhang, Y. (22)
Chen, Si, 1981 (22)
Zehri, Abdelhafid, 1 ... (19)
Mu, Wei, 1985 (19)
Ye, Lilei, 1970 (18)
Nylander, Andreas, 1 ... (17)
Kabiri Samani, Majid ... (16)
Luo, Xin, 1983 (16)
Hu, Zhili, 1983 (16)
Chen, S. (15)
Wang, Nan (15)
Hansson, Josef, 1991 (15)
Huang, S. (14)
Sun, Peng, 1979 (13)
Wang, Xitao (12)
Bao, Jie (12)
Huang, Shirong (12)
Larsson, Ragnar, 196 ... (11)
Shangguan, Dongkai (11)
Nilsson, Torbjörn, 1 ... (11)
Yuan, G. (11)
Liu, Ya, 1991 (11)
Gao, Yulai (9)
Zhai, Qijie (9)
Cao, Liqiang, 1974 (9)
Cui, H (9)
Nkansah, Amos (9)
Lu, X. (8)
Andrae, Anders, 1973 (8)
Shan, B. (8)
Lu, Hongbin (8)
visa färre...
Lärosäte
Chalmers tekniska högskola (510)
Göteborgs universitet (11)
Uppsala universitet (6)
Kungliga Tekniska Högskolan (1)
Linköpings universitet (1)
Jönköping University (1)
visa fler...
Lunds universitet (1)
Karlstads universitet (1)
visa färre...
Språk
Engelska (511)
Forskningsämne (UKÄ/SCB)
Teknik (456)
Naturvetenskap (110)
Medicin och hälsovetenskap (12)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy