Key Laboratory of Wood Science and Technology

Hangzhou, China

Key Laboratory of Wood Science and Technology

Hangzhou, China

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Yu W.W.,Nanjing Forestry University | Yu W.W.,Nanjing Institute of Industry Technology | Zhang J.,Nanjing Forestry University | Wu J.R.,Nanjing Forestry University | And 3 more authors.
Journal of Applied Polymer Science | Year: 2017

This article presents research results showing that the property of fused deposition modeling (FDM) products is obtained jointly by careful control of processing parameters, structure of products, and the composition of material. In this manuscript, poly(lactic acid) (PLA) was incorporated with graphene or carbon nanotube (CNT) through repeated melt blending. Filament of the PLA/graphitic nano-filler was prepared and used in FDM. Rheological and thermal analysis were conducted to assess the suitability of the composite as FDM feedstock, and mechanical and electrical property were tested subsequently. Research results demonstrate that filament diameter-regarded as processing-related parameter-was positively correlated with mechanical stiffness and strength of FDM products. Tensile elongation at break of FDM products exhibited significant increase at a raster angle of 45° compared with the filament before FDM, showing in certain cases, material property depends more on the structure than the composition. And when incorporated with graphene or CNT, the electrical conductivity of the PLA-based composite increased drastically. The electrical conductivity of the best experiment sample reached ∼10−1 S m−1, demonstrating that composition is the key to functionalizing material. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44703. © 2017 Wiley Periodicals, Inc.


Yao Q.,Zhejiang iversity | Fan B.,Zhejiang iversity | Xiong Y.,Zhejiang iversity | Wang C.,Zhejiang iversity | And 5 more authors.
Carbohydrate Polymers | Year: 2017

A self-reporting aerogel toward stress sensitive slectricity (SSE) was presented using an interconnected 3D fibrous network of Ag nanoparticles/cellulose nanofiber aerogel (Ag/CNF), which was prepared via combined routes of silver mirror reaction and ultrasonication. Sphere-like Ag nanoparticles (AgNPs) with mean diameter of 74 nm were tightly anchored in the cellulose nanofiber through by the coherent interfaces as the conductive materials. The as-prepared Ag/CNF as a self-reporting material for SSE not only possessed quick response and sensitivity, but also be easily recovered after 100th compressive cycles without plastic deformation or degradation in compressive strength. Consequently, Ag/CNF could play a viable role in self-reporting materials as a quick electric-stress responsive sensor. © 2017 Elsevier Ltd


Fan B.,Zhejiang Agriculture And forestry University | Chen S.,Zhejiang Agriculture And forestry University | Yao Q.,Zhejiang Agriculture And forestry University | Sun Q.,Zhejiang Agriculture And forestry University | And 3 more authors.
Materials | Year: 2017

Cellulose nanofiber/AlOOH aerogel for flame retardant and thermal insulation was successfully prepared through a hydrothermal method. Their flame retardant and thermal insulation properties were investigated. The morphology image of the cellulose nanofiber/AlOOH exhibited spherical AlOOH with an average diameter of 0.5 μm that was wrapped by cellulose nanofiber or adhered to them. Cellulose nanofiber/AlOOH composite aerogels exhibited excellent flame retardant and thermal insulation properties through the flammability test, which indicated that the as-prepared composite aerogels would have a promising future in the application of some important areas such as protection of lightweight construction materials. © 2017 by the authors.


Li Y.,Zhejiang Agriculture And forestry University | Li Y.,Key Laboratory of Wood Science and Technology | Yin L.,Zhejiang Agriculture And forestry University | Yin L.,Key Laboratory of Wood Science and Technology | And 7 more authors.
Holzforschung | Year: 2015

Bamboo was thermally treated at 180°C and 200°C, and the micromechanical properties of its cell walls were investigated by means of quasi-static and dynamic nanoindentation experiments. With increasing treatment temperatures, the average dry density and mass of the bamboo decreased, whereas the already reduced elastic modulus at 180°C of the fiber cell walls did not change, but the hardness showed increasing tendencies. Dynamic nanoindentation revealed reduced storage modulus (E′r) $({E'-{\rm{r}}})$ and loss modulus (E″r) $({E''-{\rm{r}}}\,)$ for the thermotreated bamboo cell walls compared with the untreated bamboo fibers in all frequency regions. Moreover, E′r,E″r, ${E'-{\rm{r}}},{\rm{ }}{E''-{\rm{r}}},$ and loss tangent (tan δ) of treated bamboo decreased with increasing treatment temperature. © 2015 by De Gruyter.


Li D.,China University of Petroleum - East China | Li D.,Zhejiang University | Li D.,Key Laboratory of Wood Science and Technology | Li C.,Qingdao Hisense Hitachi Air conditioning Systems Co. | And 3 more authors.
Materials Letters | Year: 2015

We studied effects of impregnation ratio and activation time on ultramicropores of KOH-activated peanut shell active carbons (ACs). The ultramicropores were characterized in terms of ultramicropore volume (V<0.7 nm), ultramicropore fraction (V<0.7 nm/Vt), and pore size distribution. The ultramicropores of the ACs were mostly in the range of 0.45-0.70 nm. Increasing the impregnation ratio from 1 to 3 first increased the V<0.7 nm and V<0.7 nm/Vt, and then decreased them. Prolonging the activation time from 1 h to 2 h resulted in a minimum V<0.7 nm/Vt, but hardly affected the V<0.7 nm. The AC with the highest V<0.7 nm (0.11 ml/g) was obtained by activation for 1-2 h at an impregnation ratio of 2. The V<0.7 nm bore a linear relationship with the CO2 uptakes at 0.1 and 0.2 bar (0 °C). This research was significant for preparation of ACs with developed ultramicropores. © 2014 Elsevier B.V. All rights reserved.


Miao H.,Chinese Academy of Forestry | Zhou Y.,Chinese Academy of Forestry | Zhou Y.,Key Laboratory of Wood Science and Technology | Sheng Z.,China Foma Group Co. | And 5 more authors.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

The hot platen needs to be lifted and descended integrally, and to be kept in horizontal level during the process which was realized by position synchronization control of multiple group hydraulic cylinders. It is a difficult point in control of continuous flat press. In order to solve this problem, a ramp type successive-approximation algorithm was proposed. The algorithm can dynamically select one group of hydraulic cylinder as "virtual main system", and the other groups as "slave system" according to the actual displacement of the hydraulic cylinders in any control cycle. Then the virtual main system can gradually approach the target value step-by-step with a certain ramp. At the same time the slave system tracks the virtual main system in real time, so that it can be realized that the multiple group hydraulic cylinders move synchronously during the lifting and descending process. The algorithm was simulated in Matlab. Then the algorithm was applied to the continuous flat press production line designed by China Foma (Group)Co., Ltd. Production practice indicates that the algorithm can solve the interaction and influence between the multiple group hydraulic cylinders in movement effectively. The synchronous error of the lifting and descending process is 0.5 mm and 0.6 mm respectively. The shock of hydraulic components is less, the process is smooth and the control precision can meet technological requirements.


Jin C.,Zhejiang Agriculture And forestry University | Jin C.,Key Laboratory of Wood Science and Technology | Yao Q.,Zhejiang Agriculture And forestry University | Li J.,Zhejiang Agriculture And forestry University | And 3 more authors.
Materials and Design | Year: 2015

Magnetic γ-Fe2O3 nanoparticles were successfully deposited on the surface of the bamboo via a coprecipitation process at room temperature. Spherical-like magnetic γ-Fe2O3 nanoparticles with a diameter of about 17nm displayed well superparamagnetic behavior and were chemically bonded to the bamboo surface through the combination of hydrogen groups. With further modification by 1H,1H,2H,2H-perfluorodecyltri ethoxysilane (FAS-17), magnetic γ-Fe2O3/bamboo composites (MBCs) expressed superhydrophobic performances to not only water but also common liquids like coffee, milk, ink, tea, and coke. When immersed into the corrosive solutions including strong acid (pH=1), heavy alkaline (pH=14), and salt with high concentration (5M) for 24h, superhydrophobic magnetic γ-Fe2O3/bamboo composites (SMBC) still remained magnetism as well as superhydrophobicity. Also, under harsh conditions like boiled at 100°C for 4h, frozen at -40°C for 24h, SMBCs were kept a robust magnetism and superhydrophobicity. Additionally, SMBC was a typical ferromagnet and exhibited some microwave absorbabilities. © 2015 Elsevier Ltd.


Zhang H.,Zhejiang Agriculture And forestry University | Zhang W.,Zhejiang Agriculture And forestry University | Jin C.,Zhejiang Agriculture And forestry University | Li S.,Zhejiang Agriculture And forestry University | Li S.,Key Laboratory of Wood Science and Technology
Journal of Nanomaterials | Year: 2016

Wood materials with antiflaming capability were successfully fabricated by depositing a TiO2-decorated ZnO nanorod arrays (ZNAs) film on wood surface using a facile and one-pot hydrothermal method. The prepared specimens were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDXA), and powder X-ray diffraction (XRD). To explore the antiflaming properties, the combustion parameters of the wood treated by TiO2-decorated ZNAs were measured using the cone calorimetry technique compared with the untreated wood. For treated wood, the burning duration was prolonged for 55 s; smoke production rate (SPR) and total smoke production (TSP) were obviously reduced, especially for the production of CO was almost zero. As a result, thin inorganic film of TiO2-decorated ZNAs had desirable fire resistance, and one-pot hydrothermal method was a feasible method to fabricate nonflammable wood materials. © 2016 Hong Zhang et al.


Guo M.,Zhejiang Agriculture And forestry University | Fei M.,Zhejiang Agriculture And forestry University | Liu H.,Zhejiang Agriculture And forestry University | Liu H.,Key Laboratory of Wood Science and Technology | And 2 more authors.
Polymer Chemistry | Year: 2015

A novel cellulose-based hyperbranched polyester (CHBP) has been prepared through the polycondensation of an ABn-type monomer, which was synthesized from a reaction of acetylated oligomeric cellulose bromide with tyrosine via the Koenigs-Knorr reaction, followed by deacetylation. Its chemical structure, thermal stability as well as biodegradability were preliminarily investigated. This journal is © The Royal Society of Chemistry 2015.


Yao Q.,Zhejiang Agriculture And forestry University | Jin C.,Zhejiang Agriculture And forestry University | Jin C.,Key Laboratory of Wood Science and Technology | Zheng H.,Zhejiang Agriculture And forestry University | And 3 more authors.
Journal of Nanomaterials | Year: 2015

Magnetic NiFe2O4 nanoparticles were successfully deposited on the wood surface via a hydrothermal process at 70°C. The surface of the as-prepared magnetic NiFe2O4/wood hybrids (MWHs) was covered by spherical-like NiFe2O4 particles with an average size of 50 nm. MWH exhibited the thermostability, microwave absorbability, and superparamagnetism with saturation magnetization (M s) of 1.79 emu·g-1. With further modification by 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS-17), MWH expressed superhydrophobic performances with a water contact angle of 158°. Its superparamagnetism stably remained under harsh conditions after chemical solutions corrosion and physical frozen test. © 2015 Qiufang Yao et al.

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