运用两种不同技法制备了ZrO2纳米粒子改性的膨化石墨/焦炭复合材料,应用XRD、SEM和TEM对所得ZrO2改性炭材料进行了表征.技法1:在ZrO(NO3)2及NH4OH溶液中反复交替地浸渍低密度膨化石墨/焦炭块体,随后在1200℃氮氛中热处理,以使在炭块自由表面沉积ZrO2纳米粒子的薄层.技法2:将可膨胀石墨、酚醛树脂粉和ZrOC2 O4-改性的纤维素纤维混合物封装于一容器中,使之经受900℃热激震,随后在氮氛中1200℃热处理,获得改性复合材料.结果表明:复合材料中ZrO2纳米粒子呈现三种尺寸:6nm～30nm为单独的纳米粒子和小微粒;200nm～1000nm为长树突状结构物;1μm～40μm为形如纤维素前驱体的杆状物.
Exfoliated graphite/coke composites modified by ZrO2 nanoparticles were produced using two different techniques and characterized by means of X-ray diffraction, scanning and transmission electron microscopy. In the first, low-density exfoliated graphite/coke blocks were dipped repeatedly and alternately in ZrO(NO3)2 and NH4OH solutions and subsequently heat treated at 1200℃ in nitrogen to deposit thin layers of ZrO2 nanoparticles on the free surfaces of the carbon matrix. In the second, a mixture of expandable graphite, phenol-formaldehyde resin powder, and ZrOC2O4-modified fibrous cellulose in a sealed container was submitted to thermal shock at 900℃ followed by heat treatment at 1200℃ in nitrogen to obtain the modified composites. The ZrO2 nanoparticles formed in the second technique were incorporated into the composites in three length scales: 6-30nm-isolated nanoparticles and small blobs, 200-1000nm-lengthy dendrite-like structures, and thin layer adhering to the surface of the 1-40μm long cellulose carbon fibers.
参考文献
| [1] | I.M.Afanasov;V.A.Morozou;A.V.Kepman .Preparation,electrical and thermal properties of new exfoliated graphite-based composites[J].Carbon: An International Journal Sponsored by the American Carbon Society,2009(1):263-270. |
| [2] | Blain D P;Mercuri R A .Thermal insulating device for high temperature reactors and furnaces which utilize highly active chemical gases[P].US,6387462,2002-05-14. |
| [3] | Sorokina NE;Redchitz AV;Ionov SG;Avdeev VV .Different exfoliated graphite as a base of sealing materials[J].The journal of physics and chemistry of solids,2006(5/6):1202-1204. |
| [4] | Rutherford R B;Dudman R L .Ultra-thin flexible expanded graphite resistance heater[P].US,200410086449A1,2004-05-06. |
| [5] | A. Celzard;J. F. Mareche;G. Furdin .Modelling of exfoliated graphite[J].Progress in materials science,2005(1):93-179. |
| [6] | Avdeev V V;Semenenko K N;Ionov S G et al.Method of producing porous isotropic graphite materials[P].SU,1617869,1994-01-03. |
| [7] | Seleznev A N;Afanasov I M;Sviridov A A et al.Method to produce of composite carbon materials[P].RU,2377223,2009-12-27. |
| [8] | Novikov V P;Matveev A T;Viktorov I A et al.Metal-cellulose synthesis of YBa2Cu3O7-x[J].Superconductivity:Physics Chemistry Technology,1989,2:178-182. |
| [9] | Lin J M;Hsu M C;Fung K Z.J .Deposition of ZrO2 film by liquid phase deposition[J].Journal of Power Sources,2006,159:49-54. |
| [10] | Arcot P K;Luo J .Layer-by-layer deposition of zirconia thin films from aqeous solutions[J].Materials Letters,2008,62:117-120. |
| [11] | Garvie R C .Stabilization of the tetragonal structure in zirconia microcrystals[J].Journal of Physical Chemistry,1978,82:218-223. |
| [12] | S. LI;W.T. ZHENG;Q. JIANG .Size and Pressure Effects on Solid Transition Temperatures of ZrO_2[J].Scripta materialia,2006(12):2091-2094. |
| [13] | Toyoda M.;Inagaki M. .Heavy oil sorption using exfoliated graphite - New application of exfoliated graphite to protect heavy oil pollution[J].Carbon: An International Journal Sponsored by the American Carbon Society,2000(2):199-210. |
| [14] | Kwon S.;Vidic R.;Borguet E. .The effect of surface chemical functional groups on the adsorption and desorption of a polar molecule, acetone, from a model carbonaceous surface, graphite[J].Surface Science: A Journal Devoted to the Physics and Chemistry of Interfaces,2003(1/3):17-26. |
| [15] | Morgan P.Carbon Fibers and Their Composites[M].Boca Raton FL:Taylor and Francis Group,2005:270-272. |
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