Key Laboratory of Bio based Material Science and Technology

Laboratory of, China

Key Laboratory of Bio based Material Science and Technology

Laboratory of, China
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Shen J.,Key Laboratory of Bio based Material Science and Technology | Shen J.,Northeast Forestry University | Liu Z.,Key Laboratory of Bio based Material Science and Technology | Liu Z.,Northeast Forestry University | And 4 more authors.
Journal of Forestry Research | Year: 2011

A study was conducted to test wettability changes of the wheat straw treated with different methods for the preparation of wheat straw particle board. The wheat straws were separately sprayed with two chemicals (0.6% NaOH, 0.3% H2O2) and three enzymes (lipase, xylanase, cellulase). The contact angle between water and the surface of wheat straw was measured and the spreading-penetration parameters (K-values) were also calculated with wetting model. The surfaces of treated wheat straw and control sample were scanned by means of Micro-FTIR, and their peaks arrangements were analyzed. The surface morphologies of treated wheat straw and control sample were also observed by SEM. Chemical etching was found on the exterior surfaces of the straws treated separately with 0.6% NaOH and 0.3% H2O2; furthermore, the spreading-penetration parameters (K-values) of the distilled water on the exterior surfaces of the treated wheat straw along the grain were higher than that of control. The wettability of exterior surfaces of the wheat straws treated separately with lipase, xylanase and cellulose were improved after treating for seven days, and among the three enzymes treatments, the lipase treatment showed best result. The lipase treatment and NaOH treatment were determined as better methods for improving the wettability of wheat straw surfaces. However, in the economic aspect, NaOH treatment was more practical and easier in the pretreatment for the manufacture of straw particle board. © 2011 Northeast Forestry University and Springer-Verlag Berlin Heidelberg.


Wang Y.,Harbin University of Science and Technology | Mo Y.,Harbin University of Science and Technology | Wen A.,Harbin Institute of Technology | Xu C.,Harbin Institute of Technology | And 4 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2011

Near-stoichiometric Cu:Fe:LiNbO3 crystals doped with 0.15% (in mass, the same below) CuO, 0.03% and 0.05%Fe2O3 were grown by top seeded solution growth method using K2O as a flux. The types of light-exciting carriers of Cu:Fe:LiNbO3 crystal were tested using Ar+ laser as light source at the 488 nm. The photorefractive holographic storage properties of the crystals were measured by two-wave coupling experiment, and were compared with those of Fe:LiNbO3 crystals tested using the 633 nm laser as light source. The results show that the holes are dominant in the light-exciting carriers of Cu:Fe:LiNbO3 crystal. Compared to the Fe:LiNbO3 crystal, the response speed, the sensitivity and dynamic range of Cu:Fe:LiNbO3 crystal are enhanced by 60, 67 and 15 times, respectively. The mechanism of blue photorefractive enhancement is discussed. The near-stoichiometric Cu:Fe:LiNbO3 crystals have excellent blue photorefractive properties.


Ma Y.,Northeast Forestry University | Ma Y.,Key Laboratory of Bio Based Material Science and Technology | Wang R.,Northeast Forestry University | Fang G.,Northeast Forestry University | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

To improve the cumulative release rate of iron, polyacrylic acid grafted alkali lignin-based (ALS-G-P (AA)) iron fertilizer was prepared by acrylic monomer grafted the amorphous alkali lignin. The influences on water absorbency of the materials to neutralization degree of acrylic acid, the dosage of initiator and cross-linking agent, temperature and grafting degree of alkali-lignin were investigated by orthogonal test. Release performance of ALS-G-P (AA) iron fertilizer was researched. The results showed the ideal preparation conditions were as follow: the degree of acrylic acid was 60%, amount of initiator was 0.06 g and the cross-linking agent was 0.03 g, temperature was 60°C and alkali-lignin grafting was 25%. Water absorbency of ALS-G-P (AA) iron fertilizer was 1017 g/g, the iron content of which was 7.74 mg/g. Effective release period of water saturated ALS-G-P (AA) iron fertilizer with was 22 days. Iron cumulative released rate of ALS-G-P (AA) iron fertilizer in water fitted a quadric equation. Curve of the iron cumulative release rate was S pattern. The study provides a reference for the efficient application of iron fertilizer, and expanded application of the alkali lignin in agricultural fields of controlled release carriers.


Zhang C.-L.,Key Laboratory of Bio Based Material Science and Technology | Xu C.,Harbin Institute of Technology | Fan Y.-X.,Harbin University of Science and Technology | Leng X.-S.,Harbin Institute of Technology | And 4 more authors.
Guangzi Xuebao/Acta Photonica Sinica | Year: 2011

Zn:Mn:Fe:LiNbO3 crystals with 1%, 3%, 5%, 7% and 9%, ZnO (in mole) and MnCO3 and Fe2O3, added at concentration of 0.03% and 0.08 (in mass) respectively, were grown by Czochralski method from congruent LiNbO3 melting. The OH- infrared absorption spectra, the optical damage resistance and phase conjugate properties of Zn:Mn:Fe:LiNbO3 crystals were tested. When Zn2+ concentration reaches 7% and 9%, OH- absorption peaks shift to 3528 cm-1. The mechanism of OH-1 absorption peaks shift were discussed. The optical damage resistance ability of Zn:Mn:Fe:LiNbO3 crystals increase, with the increase of Zn2+ concentration. When Zn2+ concentration reaches to 7% (reaches threshold value), the optical damage resistance ability are two orders of magnitude higher than that of LiNbO3 crystals. The enhancement mechanism of optical damage resistance of highly doping zinc Mn:Fe:LiNbO3 crystals was researched. The bhase conjugate reflectivity decreases and phase conjugate response speed increases, with the increase of Zn2+ concentration. The phase conjugate mirror has eliminate optical wave phase distortion. The holographic associative storage experiment was carried out using Zn:Mn:Fe:LiNbO3 crystals as storage medium. The working principle of holographic associative storage was discussed. Using 25% and 50% addressing, the intact storage image was received in output plane.


Ma Y.,Northeast Forestry University | Ma Y.,Key Laboratory of Bio based Material Science and Technology | Wang G.,Northeast Forestry University | Zhang S.,Northeast Forestry University | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

With people's increasing concern about food safety, slow/controlled release fertilizers have become a hot-point in the research and development of fertilizers because of their increasing efficiency of fertilizers, reducing environmental pollution, and increasing crop yields. Lignin can absorb metal ions via carbonyl oxygen and phenolic oxygen of the ligand, while biodegradation of lignin were a slower course, thus progressing to humus formation and the quality of organic matter were enhanced. In a word, lignin showed excellent properties for low cost, safety, and biocompatibility. It has the potential of a kind of agricultural slow/controlled release fertilizer carrier. Although grafting derivatives of alkali lignin get a modified S nutrient release curve, its cost is high. The problem hinders the application of alkali lignin in the agricultural fields as a slow/controlled release carrier. According to Mn deficiency occurs on alkaline soils in northern of china, hydroxymethyls alkali lignin (HMAL) was synthesized with wheat straw alkali lignin and formaldehyde via reacting for 2 hours at 90°C. Manganese fertilizers of cross-linked hydroxymethyls alkali lignin (CHMAL-Mn) were prepared from HMAL and an appropriate amount of manganese sulfate by physical mixing. Its yield of CHMAL-Mn was 93.7%, and the release data of manganese ion in the static water indicated that the maximum capacity of CHMAL-Mn to loading manganese was 48 mg/g. Cross-linking of hydroxymethyls alkali lignin was proved by IR. CHMAL can significantly increase the amount of Mn load on alkali lignin. The study, which can promote comprehensive utilizations and applications in the field of biodegradable slow/controlled release carrier, is of great significance. In addition, kinetic data of the Mn2+ cumulative release rate were fitted with seven fit models of dynamics and probability distribution. The best-fit model was determined by a comparison of the effectiveness of fit models using the values of R2, e, Af and Bf. The results show that the best-fit model was the Ritger-Peppas model from kinetic data of the Mn2+ cumulative release rate. Those arithmetic means of R2, e, Af and Bf were 0.9443, 0.0083, 0.0223 and 0.0003 separately. When CHMAL-Mn to loading manganese was 12 mg/g, the release index (n) of its Ritger-Peppas model from kinetic data of the Mn2+ cumulative release rate is 0.1774. Because of n<0.45, slow/controlled release mechanism of CHMAL-Mn shows as fickian diffusion. When CHMAL-Mn to loading manganese was higher than 24 mg/g, the release index (n) of its Ritger-Peppas model from kinetic data of the Mn2+ cumulative release rate is among 0.45≤n≤0.89, slow/controlled release mechanism of CHMAL-Mn shows as following synergy of non fickian diffusion and drodible matrix. Especially, when CHMAL-Mn to loading manganese was 48 mg/g, release index (n) of its Ritger-Peppas model from kinetic data of the Mn2+ cumulative release rate is 0.811. At that time the Ritger-Peppas model predicts that the maximum of Mn2+ cumulative release rate was 79.28%, effective Mn2+ release period of CHMAL-Mn was 95.92 h and the model fitting accuracy rate was 96.57%.

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