The Experts below are selected from a list of 2010 Experts worldwide ranked by ideXlab platform

Fengshan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Role of a “surface wettability switch” in inter-Fiber Bonding properties
    RSC Advances, 2018
    Co-Authors: Jinglei Xie, Hongjie Zhang, Qian Xuejun, Cheng Hongshun, Fengshan Zhang
    Abstract:

    The Fiber surface wettability is one of the most important lignocellulosic Fiber characteristics affecting the inter-Fiber Bonding properties of final bio-products. In this study, the surface wettability (evaluated by the surface free energy, surface lignin and surface charge) of mechanically refined Fibers and the Bonding properties of the Fiber matrix (handsheets) were measured and correlated to each other. The results showed that the Fiber surface charge increased from 48.38 mmol kg−1 to 60.38 mmol kg−1 and the surface lignin decreased from 87.1% to 77.5% during the Fiber mechanical treatment, leading to the improvement of the Fiber surface free energy from 46.63 mJ m−2 to 54.45 mJ m−2. As a result, the Bonding strength index increased from 2.60 N m g−1 to 9.73 N m g−1 without significant loss of bulk properties. In a word, the Fiber surface wettability could be adjusted to facilitate the inter-Fiber Bonding properties of the paper or paperboard products using lignin-rich Fibers as raw materials.

  • estimating the inter Fiber Bonding capacities of high yield pulp hyp Fibers by analyzing the Fiber surface lignin and surface charge
    Bioresources, 2017
    Co-Authors: Hongjie Zhang, Sarah Legere, Xuejun Qian, Hongshun Cheng, Fengshan Zhang
    Abstract:

    Four Fiber fractions from poplar alkaline peroxide mechanical pulping, performed with refiner-chemical preconditioning (P-RC APMP), were used to estimate inter-Fiber Bonding capacity. The relationship between Fiber characteristics and inter-Fiber Bonding capacities was investigated. The surface lignin content of the long Fiber fraction was slightly lower than that of the short Fiber fraction. Atomic force microscopy (AFM) images showed that the Fiber surfaces were heterogeneous (i.e., different cell wall layers were exposed along the Fiber surface). The Fiber fractions that had lower surface lignin content had higher Bonding capacities. Furthermore, modified PFI beating was used to peel the surface of the Fibers. After the peeling treatment, the Fiber surface charge increased remarkably, while the surface lignin concentration decreased considerably. The lignin and charge on the Fiber surface are the two key factors for estimating the inter-Fiber Bonding capacities.

  • Further understanding the response mechanism of lignin content to Bonding properties of lignocellulosic Fibers by their deformation behavior
    RSC Advances, 2016
    Co-Authors: Hongjie Zhang, Xin Wang, Fengshan Zhang
    Abstract:

    Lignocellulosic Fiber has been increasingly used in many fields. The properties of Fiber-based materials are affected significantly by the lignin content in lignocellulosic Fibers. In this study, lignocellulosic Fibers with different lignin contents were investigated by using the wet Fiber deformation behavior and the related response mechanism of lignin content to the inter-Fiber Bonding properties, and other properties were discussed for improving the high-value applications of lignocellulosic Fibers. The results showed the deformation behavior of wet lignocellulosic Fibers, including wet Fiber flexibility and collapsibility (aspect ratio) which increased from 0.516 × 1012 to 5.454 × 1012 N−1 m−2 and 1.616 to 3.652, respectively, when the lignin content decreased from 24.28% to 2.67%. As a result, the inter-Fiber Bonding properties of lignocellulosic Fibers were enhanced. For instance, the relative bonded area increased from 15.64% to 43.76% and the Bonding strength index increased from 3.597 N m g−1 to 84.065 N m g−1 with the increase in Fiber deformability. Consequently, a more compact Fiber network could be formed, showing a significant decrease in the bulk property. Therefore, the contradiction between physical strength and bulk properties of the Fiber network could be further revealed by the wet Fiber deformation behavior, which was influenced significantly by the lignin content in lignocellulosic Fibers.

Christer Fellers - One of the best experts on this subject based on the ideXlab platform.

  • Fiber length and Bonding effects on tensile strength and toughness of kraft paper
    Journal of Materials Science, 2017
    Co-Authors: Per Tomas Larsson, Tom Lindström, Leif A. Carlsson, Christer Fellers
    Abstract:

    Fiber length and Fiber-to-Fiber Bonding effects on tensile strength and fracture toughness of kraft paper have experimentally been investigated. Laboratory sheets were made from kraft pulp, each with a distinct set of Fiber lengths. Additionally, the Fiber–Fiber bond strength was improved by carboxymethyl (CMC) grafting. The tensile strength and work of fracture toughness results were compared to predictions from a shear-lag model which considers the Fiber–Fiber bond shear strength, the Fiber tensile strength and Fiber pull-out work. The tensile strength and fracture work for papers with weak Fiber–Fiber bonds increased with Fiber length consistent with the shear-lag model. CMC-treated Fibers provided strong Fiber–Fiber bonds. Papers made from such Fibers displayed high strength and work of fracture independent of Fiber length which indicates that the failure process is governed by Fiber failures rather than bond failures. The fracture toughness, expressed as the critical value of the J-integral, increased strongly with Fiber length for both untreated and CMC-treated papers. The results show that long Fibers and CMC addition are extremely beneficial for improving the fracture toughness.

Hongjie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Role of a “surface wettability switch” in inter-Fiber Bonding properties
    RSC Advances, 2018
    Co-Authors: Jinglei Xie, Hongjie Zhang, Qian Xuejun, Cheng Hongshun, Fengshan Zhang
    Abstract:

    The Fiber surface wettability is one of the most important lignocellulosic Fiber characteristics affecting the inter-Fiber Bonding properties of final bio-products. In this study, the surface wettability (evaluated by the surface free energy, surface lignin and surface charge) of mechanically refined Fibers and the Bonding properties of the Fiber matrix (handsheets) were measured and correlated to each other. The results showed that the Fiber surface charge increased from 48.38 mmol kg−1 to 60.38 mmol kg−1 and the surface lignin decreased from 87.1% to 77.5% during the Fiber mechanical treatment, leading to the improvement of the Fiber surface free energy from 46.63 mJ m−2 to 54.45 mJ m−2. As a result, the Bonding strength index increased from 2.60 N m g−1 to 9.73 N m g−1 without significant loss of bulk properties. In a word, the Fiber surface wettability could be adjusted to facilitate the inter-Fiber Bonding properties of the paper or paperboard products using lignin-rich Fibers as raw materials.

  • estimating the inter Fiber Bonding capacities of high yield pulp hyp Fibers by analyzing the Fiber surface lignin and surface charge
    Bioresources, 2017
    Co-Authors: Hongjie Zhang, Sarah Legere, Xuejun Qian, Hongshun Cheng, Fengshan Zhang
    Abstract:

    Four Fiber fractions from poplar alkaline peroxide mechanical pulping, performed with refiner-chemical preconditioning (P-RC APMP), were used to estimate inter-Fiber Bonding capacity. The relationship between Fiber characteristics and inter-Fiber Bonding capacities was investigated. The surface lignin content of the long Fiber fraction was slightly lower than that of the short Fiber fraction. Atomic force microscopy (AFM) images showed that the Fiber surfaces were heterogeneous (i.e., different cell wall layers were exposed along the Fiber surface). The Fiber fractions that had lower surface lignin content had higher Bonding capacities. Furthermore, modified PFI beating was used to peel the surface of the Fibers. After the peeling treatment, the Fiber surface charge increased remarkably, while the surface lignin concentration decreased considerably. The lignin and charge on the Fiber surface are the two key factors for estimating the inter-Fiber Bonding capacities.

  • Enhancing the inter-Fiber Bonding properties of cellulosic Fibers by increasing different Fiber charges
    Cellulose, 2016
    Co-Authors: Chengke Zhao, Hongjie Zhang, Xu Zeng, Dongyun Sun
    Abstract:

    Cellulosic Fiber has been increasingly used in many fields. The Fiber charge, including the surface charge and inner charge, affects the properties of cellulosic Fiber and Fiber-based materials significantly. In this study, the cellulosic Fiber was subjected to different treatments, including 2,2,6,6-tetramethyl-piperidine-1-oxyl radical-mediated oxidation, carboxymethyl cellulose attachment and mechanical refining, to alter the Fiber charge selectively. The effects of the Fiber surface charge and inner charge on Fiber performances and inter-Fiber Bonding strength for improving the high-value application of cellulosic Fibers, respectively, were discussed. The results showed that the performances of cellulosic Fiber can be improved with the increase of either surface or inner Fiber charges, including the increased water retention value, flexibility and inter-Fiber Bonding strength, but with slightly decreased drainability. An increasing bulk Fiber charge showed more significant enhancement of the inter-Fiber Bonding strength than only an increase of the Fiber surface charge on cellulosic Fiber. This was because the Fiber inner charge contributed to the increase of Fiber flexibility and deformability, which could benefit the inter-Fiber Bonding indirectly. As a consequence, the bulk Fiber charge enhancement was better for tensile strength improvement of handsheets (Fiber-based material) than only Fiber surface charge enhancement. Increasing both the surface charge and inner charge improved the tensile strength effectively with less change of the bulky Fiber network than the refining treatment.

  • Further understanding the response mechanism of lignin content to Bonding properties of lignocellulosic Fibers by their deformation behavior
    RSC Advances, 2016
    Co-Authors: Hongjie Zhang, Xin Wang, Fengshan Zhang
    Abstract:

    Lignocellulosic Fiber has been increasingly used in many fields. The properties of Fiber-based materials are affected significantly by the lignin content in lignocellulosic Fibers. In this study, lignocellulosic Fibers with different lignin contents were investigated by using the wet Fiber deformation behavior and the related response mechanism of lignin content to the inter-Fiber Bonding properties, and other properties were discussed for improving the high-value applications of lignocellulosic Fibers. The results showed the deformation behavior of wet lignocellulosic Fibers, including wet Fiber flexibility and collapsibility (aspect ratio) which increased from 0.516 × 1012 to 5.454 × 1012 N−1 m−2 and 1.616 to 3.652, respectively, when the lignin content decreased from 24.28% to 2.67%. As a result, the inter-Fiber Bonding properties of lignocellulosic Fibers were enhanced. For instance, the relative bonded area increased from 15.64% to 43.76% and the Bonding strength index increased from 3.597 N m g−1 to 84.065 N m g−1 with the increase in Fiber deformability. Consequently, a more compact Fiber network could be formed, showing a significant decrease in the bulk property. Therefore, the contradiction between physical strength and bulk properties of the Fiber network could be further revealed by the wet Fiber deformation behavior, which was influenced significantly by the lignin content in lignocellulosic Fibers.

Wang Chunqing - One of the best experts on this subject based on the ideXlab platform.

  • Interfacial reaction between solder alloys and metallization during laser solder Bonding process for optical Fiber alignment
    Materials Science and Technology, 2009
    Co-Authors: Wang Chunqing
    Abstract:

    Optical Fiber Bonding is a key technique in optoelectronic packaging,and the interfacial microstructure has a significant influence on solder joint reliability.In this work,80Au20Sn and 52In48Sn solders were chosen for Fiber Bonding through laser soldering,and a scanning electronic microscope(SEM) equipped with energy dispersive X-ray detector(EDX) was used to investigate the morphology and formation of microstructure at four interfaces between two solders and two metallizations: AuSn/(Au/Ti),AuSn/(Au/Ni),InSn/(Au/Ti) and InSn/(Au/Ni).Results show that a large amount of dendritic pre-eutectic ζ-phase forms at the AuSn/(Au/Ti) interface,while some needle-like(Au,Ni)3Sn2 forms at the AuSn/(Au/Ni) interface,an obviously continuous Au(In,Sn)2layer forms at the InSn/(Au/Ti) interface and an extremely thin Au(In,Sn)2layer forms at the InSn/(Au/Ni) interface.Moreover,the continuous Au(In,Sn)2 layer transforms into incontinuous block-like AuIn2 at the InSn/(Au/Ti) interface with the increase of input laser energy.

  • The microstructure of eutectic Au-Sn and In-Sn solders on Au/Ti and Au/Ni metallizations during laser solder Bonding process for optical Fiber alignment
    Conference on High Density Microsystem Design and Packaging and Component Failure Analysis, 2006. HDP'06., 2006
    Co-Authors: Yan Bohan, Wang Chunqing, Zhang Wei
    Abstract:

    In this work, two eutectic solders: 80Au20Sn and 52In48Sn were chosen for Fiber Bonding through laser soldering, and scanning electronic microscope (SEM) equipped with energy dispersive x-ray detector (EDX) was used to investigate the microstructures of at four interfaces between two solders and two metallizations: Au-Sn/(Au/Ti), Au-Sn/( Au/Ni), In-Sn/ (Au/Ti), In-Sn/(Au/Ni). Results show that as for the Au-Sn solder joint a large amount of zeta-phase was formed at the Au-Sn/(Au/Ti) interface with its morphology closely related with laser input energy; while at the Au-Sn/(Au/Ni) interface scallop-like (Au,Ni)Sn appeared with a low input energy and irregular-shaped (Au,Ni) 3Sn2 emerged with a high input energy. As for the In-Sn solder, the IMCs at the In-Sn/ (Au/Ti) interface transformed from a Au(In,Sn)2 layer to isolated Auln2 cubes with the increase of input energy while at the In-Sn/(Au/Ni) interface a thin layer of Au(In,Sn)2 was formed. As the connecting layer, Ti did not react in the soldering process

Per Tomas Larsson - One of the best experts on this subject based on the ideXlab platform.

  • Fiber length and Bonding effects on tensile strength and toughness of kraft paper
    Journal of Materials Science, 2017
    Co-Authors: Per Tomas Larsson, Tom Lindström, Leif A. Carlsson, Christer Fellers
    Abstract:

    Fiber length and Fiber-to-Fiber Bonding effects on tensile strength and fracture toughness of kraft paper have experimentally been investigated. Laboratory sheets were made from kraft pulp, each with a distinct set of Fiber lengths. Additionally, the Fiber–Fiber bond strength was improved by carboxymethyl (CMC) grafting. The tensile strength and work of fracture toughness results were compared to predictions from a shear-lag model which considers the Fiber–Fiber bond shear strength, the Fiber tensile strength and Fiber pull-out work. The tensile strength and fracture work for papers with weak Fiber–Fiber bonds increased with Fiber length consistent with the shear-lag model. CMC-treated Fibers provided strong Fiber–Fiber bonds. Papers made from such Fibers displayed high strength and work of fracture independent of Fiber length which indicates that the failure process is governed by Fiber failures rather than bond failures. The fracture toughness, expressed as the critical value of the J-integral, increased strongly with Fiber length for both untreated and CMC-treated papers. The results show that long Fibers and CMC addition are extremely beneficial for improving the fracture toughness.