The thermal conductive properties, including the diffusivity and resultant conductivity, of nonwoven nanocellulose sheets were investigated by separately measuring in in-plane thickness directions with a periodic heating method. cross-sectional area (or width) cellulose crystallites was main determinant properties. Thus, results strongly indicate that there is crystallite size effect on phonon conduction within sheets. also indicated large interfacial resistance between surfaces. propagation...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFirst Ruthenium-Catalyzed Intramolecular Pauson−Khand ReactionTeruyuki Kondo, Nobuyoshi Suzuki, Takumi Okada, and Take-aki MitsudoView Author Information Department of Energy Hydrocarbon Chemistry Graduate School Engineering Kyoto University, Sakyo-ku, 606-01, Japan Cite this: J. Am. Chem. Soc. 1997, 119, 26, 6187–6188Publication Date (Web):July 2, 1997Publication History Received12 March 1997Published online2 July inissue 1...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRuthenium-Catalyzed β-Allyl Elimination Leading to Selective Cleavage of a Carbon−Carbon Bond in Homoallyl AlcoholsTeruyuki Kondo, Kouichi Kodoi, Eiji Nishinaga, Takumi Okada, Yasuhiro Morisaki, Yoshihisa Watanabe, and Take-aki MitsudoView Author Information Department Energy Hydrocarbon Chemistry Graduate School Engineering, Kyoto University Sakyo-ku, 606-8501, Japan Cite this: J. Am. Chem. Soc. 1998, 120, 22, 5587–5588Publication Date...

Pyranopyrandiones were prepared by a novel ruthenium-catalyzed carbonylative dimerization of cyclopropenones via C-C bond cleavage. For example, treatment dipropylcyclopropenone with catalytic amount Ru3(CO)12 and NEt3 in THF under 15 atm carbon monoxide at 140 degrees C for 20 h gave functional monomer, 3,4,7,8-tetrapropylpyrano[6,5-e]pyran-2,6-dione, an isolated yield 81%. Unsymmetrically substituted pyranopyrandiones also obtained coupling alkynes similar reaction conditions.

We developed flexible polymeric "heat-guiding materials" by simply drawing bacterial cellulose (BC) hydrogels to align the nanofibers and form "nanopapers" with anisotropic thermal conductivity. The in-plane anisotropy of conductivity between drawn transverse directions increased as draw ratio increased. For BC nanopapers, coefficient expansion was found be inversely correlated diffusivity. fabricated a planar spiral sheet assembling strips visualize "heat flux controllability". coexistence...

Thermally conductive and optically transparent flexible films were fabricated using nanocellulose skeletons with acrylic resin.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRuthenium-Catalyzed Reconstructive Synthesis of Cyclopentenones by Unusual Coupling Cyclobutenediones with Alkenes Involving Carbon−Carbon Bond CleavageTeruyuki Kondo, Ayako Nakamura, Takumi Okada, Nobuyoshi Suzuki, Kenji Wada, and Take-aki MitsudoView Author Information Department Energy Hydrocarbon Chemistry Graduate School Engineering, Kyoto University Sakyo-ku, 606-8501, Japan Cite this: J. Am. Chem. Soc. 2000, 122, 26,...

[RuCl2(CO)3]2/dppp is shown to be a highly effective catalyst system for the first intramolecular oxidative amination of variety aminoalkenes when it used concomitantly with K2CO3 and allyl acetate in N-methylpiperidine, give corresponding cyclic imines indoles excellent yields. For example, reaction 2,2-diphenyl-4-pentenyl-1-amine performed presence 2 mol % [RuCl2(CO)3]2, 4 dppp, K2CO3, N-methylpiperidine at 140 degrees C 8 h gives 4,4-diphenyl-2-methyl-1-pyrroline quantitative (>99%) yield.

A novel ruthenium catalyst system of [PPN][Ru3H(CO)11]/PCy3 [PPN = bis(triphenylphosphine)iminium, Cy cyclohexyl] for the direct hydroamidation and hydroesterification alkenes with formamides alkyl formates has been developed. These addition reactions proceeded smoothly under an argon atmosphere, carbon monoxide is not needed to suppress decarbonylation formyl compounds or maintain catalytic activity.

Sunlight-driven photocatalytic water splitting shows promise for green H

The effects of homogeneous low voltage electron beam irradiation (HLEBI) under liquid nitrogen on the adhesive force peeling (oFp) at accumulative probability (Pp) laminated PTFE/PDMS sheets polytetrafluoroethylene (PTFE) and polydimethylsiloxane (PDMS) 77 K were investigated without glue. oFp values each Pp irradiated 0.04 to 0.43 MGy both 298 exceed corresponding untreated samples. Although K-HLEBI with improves value (0.06), didn't improve it. On contrary, 0.22 apparently enhanced low-Pp...

Effects of tensile prestress level on Charpy impact value (auc) 50 vol% continuous unidirectional 0 degree oriented carbon fiber reinforced epoxy polymer (CFRP) were investigated. Experimental results showed the auc at mid-fracture probability Pf = 0.50 induced by a large 17.6 MPa (109 kJm−2) was increased 30% over that (84 slight 0.25 MPa. The statistically lowest as calculated 3-parameter Weibull equation raised 26% from 73 to 92 kJm−2 showing reliability part strength. Fracture surface...

A catalyst system consisting of Cp*RuCl(cod)/PPh3 [Cp* = pentamethylcyclopentadienyl, cod 1,5-cyclooctadiene] for the novel cross-benzannulation 2 equiv dialkyl acetylenedicarboxylate with an allylic compound has been developed. As example, reaction dimethyl allyl alcohol in presence 4 mol % Cp*RuCl(cod) and PPh3 under reflux toluene 5 h gave tetramethyl 5-methyl-1,2,3,4-benzenetetracarboxylate isolated yield 84%.

Adhesive 2-layer lamination joint of aluminum/carbon fiber reinforced epoxy polymer (Al/CFRP) were prepared by a new adhesion method, double-step treatment consisting applying low dose (= 0.22 MGy) homogeneous energy electron beam irradiation (HLEBI) to the CFRP and Al prior assembly hot-press in vacuum below 1 Pa for 2 h at 403 K. No fasteners or external adhesives applied: cured enhanced HLEBI acts as adhesive Al. The apparently boosted shear strength (τ) Al/CFRP 45% probability (Ps =...

Adhesive 2-layer lamination joints of polyethylene terephthalate (PET)/epoxy resin were prepared without the use hot press using a new adhesion method applying homogeneous low energy electron beam irradiation (HLEBI) to PET prior assembly by hand pressure. HLEBI treatment within range 0.13 0.43 MGy increased adhesive force peeling (oFp) substantially over untreated. The largest oFp values at optimal dose 0.30 12.4, 37.2 and 190 Nm−1, which more than 2.2, 2.8 9.5 times larger 5.76, 13.5 20.0...

2-layer copper/polyurethane (Cu/PU) laminated sheets were prepared by a new adhesion method, double-step treatment consisting of applying low dose (≦0.43 MGy) homogeneous energy electron beam irradiation (HLEBI) prior to hot-press under 5 MPa and 413 K. Although the weak Cu/PU was observed without HLEBI, raised bonding forces as evidenced mean adhesive peeling resistance (oFp). Based on 3-parameter Weibull equation, lowest oFp value at probability (Pp) zero (Fs) could be estimated. An...

Distributed Bragg reflector (DBR)-surface emitting lasers (SELs) with buried heterostructure (BH) are fabricated the combination of metal-organic chemical vapor deposition (MOCVD), electron cyclotron resonance (ECR) dry-etching and liquid phase epitaxial (LPE) regrowth techniques. Low threshold stable fundamental lateral-mode characteristics realized by optimum design cavity diameter refractive indices. Other important such as polarization characteristics, series resistance thermal also discussed.