Surface modified cellulose nanocrystals for tailoring interfacial miscibility and microphase separation of polymer nanocomposites

Zhang, Jinlong,Li, Mei-Chun,Zhang, Xiuqiang,Ren, Suxia,Dong, Lili,Lee, Sunyoung,Cheng, H. N.,Lei, Tingzhou,Wu, Qinglin Springer-Verlag 2019 CELLULOSE Vol.26 No.7

Development of Primary Core Collection of Japanese Persimmon from China ( Diospyros kaki Thunb.) by Stepwise Clustering

Yanfang Zhang,Qinglin Zhang,Yong Yang,Zhengrong Luo 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Investigation on crack propagation properties of flange-stiffened plate structure in a sleeve

Qinglin Lian,Huaji Wang,Xiaowei Ren,Xiaochen Fan,Dingshi Li,Jinbiao Zhao,Long Ju,Guodong Zhang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

A 3D FE model has been developed to investigate the crack propagation properties of flange-stiffened plate structure in a sleeve used for loading transition, according to practical observations of the crack morphology. The stress intensity factor (SIF) was applied to analyze the crack propagation properties along crack tip in different positions of the sleeve;simulation models including either one crack or multiple cracks were studied. Results showed that crack formation had insignificant influence on the structural effective stress and deformation variations. The faces of the crack formed at the bolt hole edge were opened, meanwhile the crack possessed the highest potential to grow, while cracks in the connecting fillet between flange and stiffened plate and the flange mounting interface were less likely to propagate. Compared with the one-crack model, when multiple cracks co-existed there were limited changes on the crack respective propagation properties.

Research on Cold-Formed Steel Stiffened-Web Built-up I-Section Columns with Complex Edge Stiffeners

Zhuangnan Zhang,Yudong Li,Chungang Wang,Yikai Hao,Jianqiao Song,Qinglin Guo 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.1

A series of double-limbs built-up I-section simply supported specimens subjected to compression were examined. The test columns contained 18 concentric compression columns and 12 eccentric compression columns with three section forms respectively. The infl uence of web stiff eners on buckling mode, ultimate bearing capacity and interaction between limbs were studied. It was shown that stiff eners in web eff ectively decreased the element width-to-thickness ratio and increased the bearing capacity of built-up I-section columns. But when larger eccentricity made the moment control the failure of eccentric compression specimens, the bearing capacity of the specimens was not improved obviously by web stiff eners. Distortional buckling could replace local buckling to control the failure modes of columns. Compared with double-limbs channel steel built-up open-sections with complex edge stiff eners under the same steel quantity and eccentricity, the load carrying capacity of double limb Σ-shaped channel built-up sections increased from 4.4% to 20.3%. While for double limb channel with V-type web stiff ener sections, the increment was from 2.2% to 17.4%. Furthermore, parametric study of 90 Σ-shaped built-up section members was investigated to obtain the optimization proportion of the web sub-element and relationship of carrying capacity between single Σ-shaped section and double limb Σ-shaped I-section. Finally, the ultimate load-carrying capacity of built-up columns subjected to axial compression were calculated by two kinds of direct strength method formulas, which were compared with the tests values. The results showed that the method considered the interaction between distortional buckling and fl exural buckling could obtain conservative results.

Preparation of Tubular HNTs@PDA–Au Nanocomposites and its Electrocatalysis of Hydrazine

Xinjin Zhang,Qinglin Sheng,Jian-Bin Zheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2

Halloysite nanotubes@polydopamine (HNTs@PDA) nanocomposites were successfully synthesized, and Au nanoparticles (AuNPs) were loaded on HNTs@PDA by electrostatic adsorption. The electrochemical sensor based on HNTs@PDA–Au nanocomposites was constructed. The effect of the composition, structure and property of HNTs@PDA–Au on the response performance of the sensor was explored. The morphology and composition of the nanocomposites were characterized by field emission scanning electron microscopy, transmission electron microscopic, X-ray diffraction, energy-dispersive X-ray spectroscopy andX-ray photoelectron spectroscopy. Electrochemical results revealed HNTs@PDA–Au as the sensing interface with good effect on electrocatalytic oxidation of N2H4. This sensor detected N2H4 in the range from 0.75 μmol · L -1 to 2.8 mmol · L -1, with a sensitivity of 171.7 μA (mmol · L -1) -1 cm -2 and a detection limit of 0.25 μmol · L -1 (S/N = 3).

Design, Simulation and Rapid Manufacturing of Plate Micro Reactor

Shikai Zhang,Qinglin Wu,Dong Chen 한국고분자학회 2022 한국고분자학회 학술대회 연구논문 초록집 Vol.47 No.1

Development of a Transient ihpRNA-induced Gene Silencing System for Functional Analysis in Persimmon (Diospyros kaki Thunb.)

Mo, Rongli,Zhang, Na,Yang, Sichao,Zhang, Qinglin,Luo, Zhengrong Korean Society of Horticultural Science 2016 원예과학기술지 Vol.34 No.2

A transient ihpRNA-induced gene silencing system based on Agrobacterium-mediated injection infiltration has been established to evaluate candidate genes involved in proanthocyanidin (PAs) biosynthesis in persimmon (Diospyros kaki Thunb.). We chose DkPDS (phytoene desaturase) as a gene-silencing target to evaluate the newly developed transient gene silencing system. Our qRT-PCR analysis indicated that two ihpRNA constructs (pHG-PDS5' and pHG-PDS3') targeted DkPDS, which also led to significantly reduce expression of DkPDS in 'Mopanshi' persimmon leaves. To further confirm the reliability of the system, we successfully utilized it for DkLAR (leucoanthocyanidin reductase) gene silencing. The expression levels of DkLAR in 'Mopanshi' and 'Eshi 1' leaves were ca. 6-fold and ca. 5-fold lower than those in leaves harboring empty vector (pHG-GFP), respectively. DMACA (4-dimethylaminocinnamaldehyde) staining and the Folin-Ciocalteau assay showed that the accumulation of PAs was markedly inhibited in 'Mopanshi', 'Eshi 1' and 'Youhou' leaves. These results indicate that DkLAR plays an important role in the accumulation of PAs in persimmon. The transient ihpRNA-induced gene silencing method developed in this study is a highly efficient and useful tool for functional analysis of persimmon genes involved in PA biosynthesis.

Rheology, curing temperature and mechanical performance of oil well cement: Combined effect of cellulose nanofibers and graphene nano-platelets

Sun, Xiuxuan,Wu, Qinglin,Zhang, Jinlong,Qing, Yan,Wu, Yiqiang,Lee, Sunyoung Elsevier 2017 Materials & Design Vol.114 No.-

<P><B>Abstract</B></P> <P>Cellulose nanofibers (CNFs) were prepared through acid hydrolysis and used in combination with graphene nano-platelets (GNPs) as modifiers for oil well cement (OWC). The rheology behavior of CNF/GNP-OWC slurries at three temperatures (i.e., 20, 40, and 60°C) was measured and modeled using four different rheological models. Thermal properties, surface functional groups, morphology, and mechanical performance of the composites were characterized. CNF/GNP-OWC slurry exhibited a typical shear-thinning behavior with reduced shear viscosity at higher shear rates. The use of CNFs and GNPs led to increased yield stresses of fresh CNF/GNP-OWC slurry and temperature significantly influenced the yield stress values. Among these rheology models, the Vom Berg model exhibits the best fitting result of the slurry rheology data (R<SUP>2</SUP> =0.999). The addition of CNFs and GNPs increased degree of hydration (DOH) value of CNF/GNP-OWC composites. Both flexural and compressive strengths of the CNF/GNP-OWC composites were enhanced with added CNFs and GNPs. The reinforcing mechanism was attributed to the increased DOH, reduced pores, and bridging effect of CNFs and GNPs in the composites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cellulose nanofibers (CNFs) and graphene nanoplatelets (GNPs) reinforced oil well cement (OWC) composites were prepared and characterized. </LI> <LI> Vom Berg model provided the best fitting to measured rheology data of OWC slurry. </LI> <LI> CNFs and GNPs enhanced flexural and compressive strengths of OWC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Development of a Transient ihpRNA-induced Gene Silencing System for Functional Analysis in Persimmon (Diospyros kaki Thunb.)

Rongli Mo,Na Zhang,Sichao Yang,Qinglin Zhang,Zhengrong Luo 한국원예학회 2016 원예과학기술지 Vol.34 No.2

A transient ihpRNA-induced gene silencing system based on Agrobacterium-mediated injection infiltration has been established to evaluate candidate genes involved in proanthocyanidin (PAs) biosynthesis in persimmon (Diospyros kaki Thunb.). We chose DkPDS (phytoene desaturase) as a gene-silencing target to evaluate the newly developed transient gene silencing system. Our qRT-PCR analysis indicated that two ihpRNA constructs (pHG-PDS5’ and pHG-PDS3’) targeted DkPDS, which also led to significantly reduce expression of DkPDS in ‘Mopanshi’ persimmon leaves. To further confirm the reliability of the system, we successfully utilized it for DkLAR (leucoanthocyanidin reductase) gene silencing. The expression levels of DkLAR in ‘Mopanshi’ and ‘Eshi 1’ leaves were ca. 6-fold and ca. 5-fold lower than those in leaves harboring empty vector (pHG-GFP), respectively. DMACA (4-dimethylaminocinnamaldehyde) staining and the Folin-Ciocalteau assay showed that the accumulation of PAs was markedly inhibited in ‘Mopanshi’, ‘Eshi 1’ and ‘Youhou’ leaves. These results indicate that DkLAR plays an important role in the accumulation of PAs in persimmon. The transient ihpRNA-induced gene silencing method developed in this study is a highly efficient and useful tool for functional analysis of persimmon genes involved in PA biosynthesis.

Effects of biochar and Trichoderma on bacterial community diversity in continuous cropping soil

Xia Cao,Ning Zhang,Xiaoyu Zeng,Qinglin Lan,Nan Ma,Chuncheng Wu 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.1

Soil acidifi cation has become a serious issue in protected production in northern China as a consequence of many years ofcontinuous cropping. Besides aff ecting the growth and quality of vegetables, soil acidifi cation also restricts the sustainabledevelopment of vegetables grown in protected environments. A single application of biochar or Trichoderma can repair thesoil environment, optimize the microbial community structure, reduce plant diseases, and promote plant growth. However,it is not known whether biochar combined with Trichoderma has a synergistic eff ect on these parameters. In this study,long-term continuous cropping of cucumbers in a greenhouse was used to study the eff ect of biochar and Trichoderma onmicro-ecological environmental changes in acidifi ed soil using Illumina sequencing. The results showed that the combinedapplication of biochar and Trichoderma promoted cucumber growth; signifi cantly enhanced root vitality and superoxidedismutase, peroxidase, and catalase activities in leaves; and reduced malondialdehyde content. In addition, soil physicaland chemical properties improved; cation exchange capacity, the activity of soil polyphenol oxidase and invertase, and thediversity of soil bacterial communities increased; and the structure and relative abundance of soil bacteria changed after thecombined application of biochar and Trichoderma . Correlation analysis of environmental factors showed that total nitrogenand soil pH had the greatest impact on bacterial communities. The metabolic function of soil bacteria was improved, andthe circulation of soil nutrients was increased as a consequence of the combined application of biochar and Trichoderma .