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Sustainable Afterglow Room-Temperature Phosphorescence Emission materials Generated Using Natural Phenolics

Angewandte Chemie 2022年第31期134卷

作者： Keliang Wan Yingxiang Zhai Shouxin Liu Jian Li Shujun Li Bernd Strehmel Zhijun Chen Tony D. James Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin 150040 P. R. China Department of Chemistry Institute for Coatings and Surface Chemistry Niederrhein University of Applied Sciences Adlerstr. 1 47798 Krefeld Germany Department of Chemistry University of Bath Bath BA2 7AY United Kingdom School of Chemistry and Chemical Engineering Henan Normal University Xinxiang 453007 P. R.China

Long-lived afterglow room-temperature phosphorescence (RTP) from natural phenolics has seldom been reported yet this is essential for the development of sustainable afterglow RTP materials. With this research, we have prepared sustainable afterglow RTP materials (GA@SA) with a lifetime of up to ≈934.7 ms by embedding gallic acid (GA) within a Ca 2+ -crosslinked sodium alginate (SA) matrix. Theoretical simulations indicate that the restricted carbonyl moieties of the GA and H-type aggregates of GA in a SA matrix promoted the spin orbit coupling (SOC) of GA and induced afterglow emission. Moreover, afterglow RTP emission could be produced by embedding different types of natural phenolics such as, tannic acid, caffeic acid and chlorogenic acid into Ca 2+ -crosslinked networks of SA. As an illustration of potential applications, GA@SA was used to prepare anti-counterfeit afterglow clothing and paper. This work provides an innovative method for the activation of long-lived afterglow RTP from sustainable phenolics.

关键词： Afterglow Emission Long Lifetime Natural Phenolics Sodium Alginate Sustainability

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Prediction of lute acoustic quality based on soundboard vibration performance using multiple choice model

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Journal of Forestry Research 2017年第4期28卷 855-861页

作者： Yang Yang Zhenbo Liu Yixing Liu Key Laboratory of Bio-based Material Science and Technology of National Ministry of Education Northeast Forestry UniversityHarbinHeilongjiangPeople’s Republic of China

The vibrational performance of wood materials critical affects the acoustic quality of a lute. The purpose of this research was to apply a multiple choice model to predict the quality of musical instruments based on data on lute soundboard vibrational properties of Paulownia wood. In the lute production, lute material selection mainly depends on the subjective evaluation of technicians, which is not only inefficient, but inaccurate. In this study, nine lutes were fabricated. Using the multiple selection model, the lute tone quality was predicted by the soundboard wood vibration data. Compared with the actual value, the dependent value predicted by the count of observations with the maximum probability had 22 erroneous judgments. The model precision is 87.78%. The results confirmed that the prediction model can be used as a guideline for the selection of the soundboard wood in musical instrument plants.

关键词： Multiple choice model Musical instrument quality Normal distribution Vibration performance

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The Effect of Pretreatment Method on the Decorative Effect of the Wax Furniture 3

The Effect of Pretreatment Method on the Decorative Effect o...

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2018 3rd International Conference on Insulating materials, material Application and Electrical Engineering, IMMAEE 2018

作者： Dao, Thanh Giang Nguyen, Tat Thang Song, Xiaoxue Wang, Xuting Song, Kuian Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin150040 China Northeastern College of Agriculture and Forestry Quang Ninh Viet Nam Vietnam National University of Forestry Ha Noi Viet Nam

In this study, the authors used hot wax selected from beeswax and insect wax. These two types of wax are blended with a 1: 1 ratio. Then use three methods of surface treatment before wax coating on the Ash wood surface including hydrothermal method, compound lye method, and plasma method. Through comparative analysis of 4 properties: color, adhesion, hardness and surface properties of the hydrophobic coating. The results show that the hot wax coating on the ash surface can maintain the original color of the wood. Comparison of three methods of wood treatment shows that: plasma method for the coating surface has the best adhesion, hydrothermal method for best surface hardness of the coating, and the hydrophobicity of hot wax after hydrothermal pretreatment is the best. © Published under licence by IOP Publishing Ltd.

关键词： Adhesion

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Study material ratio green bean powder and polylactic acid powder for the 3D printing technology selective laser sintering 3

Study material ratio green bean powder and polylactic acid p...

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2018 3rd International Conference on Insulating materials, material Application and Electrical Engineering, IMMAEE 2018

作者： Dinh, Ba Bach Guo, Yanling Nguyen, Tat Thang Zhang, Hui Yu, Yueqiang College of Mechanical and Electrical Engineering Northeast Forestry University Harbin150040 China Vietnam National University of Forestry Hanoi156200 Viet Nam Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin150040 China

The world's population is increasing, so the demand for material also increases. Currently scientists are therefore searching for new materials that have a stable supply of large quantities. The combination of green bean powder with polylactic acid powder has a composition ratio (10/90;20/80;70/30 and 40/60 (wt/wt)) used as input material for 3d printing technology SLS. High-power laser experiments were performed on a mixture of green bean powder and polylactic acid powder (GBCP), which produced a new synthetic material both biodegradable. Then, the GBCP composite material was tested for mechanical properties in each type of mixing ratio, observing the cross section of the material structure. Results obtained at 20/80 (wt/wt) mixing ratio of GBCP composite have a tensile strength of 2.5705 MPa, bending strength of 5 MPa and impact strength of 0.501kJ/m2. © Published under licence by IOP Publishing Ltd.

关键词： Sintering

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Effects of laccase incubated from white rot fungi on the mechanical properties of fiberboard

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Journal of Forestry Research 2017年第6期28卷 1282-1289页

作者： Xiaodong Zhu Song Han Yu Liu Guangsheng Chen Key Laboratory of Bio-based Material Science and Technology (Ministry of Education) Northeast Forestry University Harbin 150040 People’s Republic of China College of Forestry Northeast Forestry UniversityHarbin 150040 People’s Republic of China

White rot fungi were optimized to cultivate highly active laccase. The characteristics of laccase incubated by continuous culture were compared with those of direct culture. The enzyme activity of laccase incubated by continuous culture technology reached a higher value on the fifth day of the growth. The optimization incubation time of high activity laccase was the eleventh day. A large amount of highly active laccase can be obtained in a relatively short time by continuous culture to replace traditional laccase. After laccase treatment, the lignin composition of wood fibers were oxidation-catalyzed by laccase. The number of chemical-bonding points between the wood fibers was increased. The wood fibers treated by laccase were fabricated into boards and their mechanical properties improved with the laccase-incubation times. Compared with the fiberboards made from fibers that were pre-treated by laccase of incubation 5 days, the static bending strength of those that were pre-treated by laccase of incubation 11 days was increased by 18.95%, the elastic modulus was increased by 35.49%, and the internal bond strength was increased by 44.11%.

关键词： White rot fungus Laccase Fiberboard Mechanical property

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Nitrogen doped porous carbon derived from bamboo shoot as solid base catalyst for Knoevenagel condensation and transesterification reactions

Nitrogen doped porous carbon derived from bamboo shoot as so...

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首届中国竹藤产业创新发展大会暨第三届中国竹藤资源利用学术研讨会

作者： Bingbing Mi Xiufang Chen Changle Jiang Jingxin Wang Xiujuan Chen Bo Zhang Xianmiao Liu Zhijia Liu Benhua Fei International Centre for Bamboo and Rattan BeijingChina100102 Key Laboratory of Bio-based Material Key Laboratory of Bio-based Materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChine School of Natural Resources West Virginia UniversityMorgantownWVUSA26506 Material Science and Engineering Benjamin M.Statler College of Engineering and Mineral ResourcesWes International Centre for Bamboo and Rattan BeijingChina100102

Highly porous nitrogen doped carbon materials derived from bamboo shoots were manufactured through simultaneous carbonization and activation with one-pot synthesis *** results showed that the obtained carbons had a large specific surface area,a high N content and hierarchically porous *** the obtained N-doped carbons were used as catalysts for the Knoevenagel condensation and transesterification reactions,they exhibited excellent activity after *** manufacturing process affected on its catalyst activity and the maximum conversion of 16.1%was found to *** BSNC-700 were deprotonated by tBuOK with a concentration of 1.0M,the catalyst conversion increased from 16.1%to 79.9%.the deprotonated base catalyst could also transesterfied ethy acetoacetatc into the corresponding *** unsaturated alcohol was used,BSNC-700-tBu(0.1M)had a relatively high conversion and *** results from this research will provide a guideline to develop bamboo shoot as a precursor to fabricate a superb solid base catalyst.

关键词： Bamboo shoot Nitrogen doped Solid base catalyst Knoevenagel condensation Transesterification

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Examine temperature field at sealing surfaces treated by laser sealing using Ansys software 3

Examine temperature field at sealing surfaces treated by las...

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2018 3rd International Conference on Insulating materials, material Application and Electrical Engineering, IMMAEE 2018

作者： Nguyen, Trong Tuan Nguyen, Tat Thang Le, Ngoc Hoan To, Quoc Huy Hua, Jun Department of Mechanical Design and Theory College of Mechanical Engineering Northeast Forestry University Harbin150040 China Vietnam Academy of Forest Sciences Ha Noi Viet Nam Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin150040 China Vietnam National University of Forestry Ha Noi Viet Nam Forest Industries Research Centre University of the Sunshine Coast Australia

Upon deposition of laser irradiation on sealing surface, energy build-up heats up the structural radiation area, significantly and rapidly changing the mechanical properties of the materials in the irradiated area. Consequently, the change of material properties leads to the liquidation of the radiated surfaces which is responsible for the binding efficacy of EVA glue. It is therefore important to investigate the temperature field during the transient sealing period. In our study we demonstrate a method of temperature field investigation by finite element analysis using Ansys software. Three-dimensional finite element simulation is employed to investigate the temperature fields and heat flux in a 0.2mm-thick adhesive layer on surface of a sealing edge with total thickness of 0.5mm x 22mm width. The laser beam was emitted by a device with laser power of 3kw, scanning speed 100mm/s, 980nm wavelength, induced temperature ranging from 100°C to 160°C. Results proved optimal temperature of 135°C, inducing total heat flux of 8731.8 w/m2 which is suitable for melting adhesive for optimized binding efficacy. Our study introduced the optimal temperature, heat flux generated by the laser beam yet retaining performance of adhesive, as well as ascertaining binding efficacy and durable linkage between EVA glue and surface of wooden boards. © Published under licence by IOP Publishing Ltd.

关键词： Heat flux

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Non-isothermal crystallization kinetics of wood-flour/polypropylene composites in the presence of b-nucleating agent

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Journal of Forestry Research 2016年第4期27卷 949-958页

作者： Lang Huang Haigang Wang Weihong Wang Qingwen Wang Yongming Song Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) Northeast Forestry University

The influence of aryl amide compounds（TMB）as b-nucleating agents, on the non-isothermal crystallization of a wood-flour/polypropylene composite（WF/PP）prepared by compression molding was investigated by wide-angle X-ray diffraction and differential scanning calorimetry. TMB was proved to be an effective b-crystalline nucleating agent for WF/PP. The DSC data showed that the crystallization peak temperature（Tp） increased and the half-time（t1/2） decreased with the addition of *** theoretical models were used to analyze the nonisothermal crystallization process. The modified Avrami method and Mo method successfully explained the nonisothermal crystallization behavior of PP and its composites. Their activation energies for non-isothermal crystallization were determined basing on the Kissinger method.

关键词： isothermal kinetics crystalline polypropylene calorimetry nucleation flour molding crystallinity amide

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Photoluminescent film functionalized with quantum dots embedded in cellulose nanofibrils matrices for application of anti-counterfeit marking

Photoluminescent film functionalized with quantum dots embed...

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第三届中国国际复合材料科技大会

作者： Xiaowan Li Yingcheng Hu Northeast Forestry University Key Laboratory of Bio-based Material Science and TechnologyMinistry of Education

A facile and robust strategy is required to fabricate film with highly photoluminescent for application in the field of anti-counterfeit marking. Here we report a kind of multifunctional bio-nanocomposite film with CdTe quantum dots（QDs） decorated with cellulose nanofibrils（CNFs）. The CNFs-CdTe QDs nanocomposite films were synthesized and characterized with Fourier-transform infrared spectrometry（FT-IR）, X-ray diffraction（XRD）, scanning electron microscope（SEM）, transmission electron microscope（TEM）, thermogravimetric analyzer（TGA）, UV vis spectroscopy, and fluorescent spectroscopy. In this work, the amino-coated CdTe QDs were conjugated with TEMPO-oxidized CNFs and subjected to crosslinking modification with EDC/NHS through covalent binding. The cysteamine（CA） capped CdTe quantum dots（QDs）, which have plenty of amino at the surface, are one of the most commonly used aqueous QDs because of high and stable luminescence. The size of the CdTe QDs in the CNFs matrices could be adjusted so that obtain the CNFs-CdTe QDs nanocomposite material with different fluorescent colors. These results indicated that the functional CNFs-CdTe QDs films material with the fluorescence-tunable was constructed and successfully applied to anti-counterfeit marking.

关键词： Cellulose nanofibrils CdTe quantum dots Photoluminescent film Anti-counterfeit marking

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The Influence of Toughening Modification on Properties of Poly(Lactic Acid)/Wood Flour Three-Dimensional Printing Composites

The Influence of Toughening Modification on Properties of Po...

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第三届中国国际复合材料科技大会

作者： Rui Guo Min Xu Northeast Forestry University Key Laboratory of Bio-based Material Science and Technology Ministry of Education

In this paper, TPU, PCL and POE were used as toughening agents, and the melt were mixed with the matrix polylactic acid(PLA), and then the PLA/poplar wood flour composite wires was prepared by drawing forming, finally, the PLA/poplar wood flour composite wire material was prepared by wire drawing. In the end, the PLA/poplar wood flour 3D printing composite was prepared by the 3D printer. The effects of different types toughening agents on properties of the composites were studied. Results show that, The composite with PCL as toughening agents gains better mechanical properties. Compared with the three types of TPU, the mechanical properties of the composite, with the addition of the type 85 A, are better than the other two types. Through the exploration of processing parameters on FDM technology, finally and successfully, the entity model based on the composite was printed out.

关键词： Toughening Modification PLA Three-Dimensional Printing Composites

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