The Influence of Milling Parameters on the Fibrillation of PBO Fiber

2012 ◽  
Vol 482-484 ◽  
pp. 1894-1897 ◽  
Author(s):  
Lin Liu ◽  
Guang Li
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Rotation Number ◽  
Water Retention ◽  
Processing Parameters ◽  
High Specific Surface Area ◽  
Water Retention Value ◽  
Milling Parameters ◽  
Pbo Fiber

PFI mill was used to prepare PBO fibrils from PBO fiber. With the help of the observation of SEM and the measure of water retention value as well as the analysis of specific surface area, it was found that the milling parameters, including the beating rotation number, beating spacing, beating pressure and beating concentration, influenced the fibrillation of PBO fiber. The processing parameters were studied. The optimal milling conditions were obtained: beating rotation number of 40000-50000r, spacing of 2.4mm, pressure of 4.89N/mm, and concentration of 7.5%. The prepared PBO fibrillar fiber has high specific surface area of 5.001m2/g, while the original PBO fiber has only a specific surface area of 0.476m2/g.

Modification of Cellulase to Different Bleached Softwood Pulp

2012 ◽  
Vol 550-553 ◽  
pp. 1186-1189
Author(s):  
Min Du ◽  
Xin Ping Li ◽  
Jin Wang ◽  
Peng Zhou Wang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Water Retention ◽  
Raw Material ◽  
Enzymatic Modification ◽  
Water Retention Value ◽  
Wetting Properties ◽  
Before And After ◽  
Wetting Property

Cellulase named as Novozym 476 was used to modify three kinds of bleached softwood pulps respectively. By analyzing the changes of refining degree, water retention value, specific surface area, wetting properties of fiber before and after enzymatic treatment, studied the influence of characteristics of raw material to the effect of enzymatic modification. The results indicate that in the same conditions, the refining property, water retention value, specific surface area and wetting property of the three pulps all increase. Among these three pulps, the pulp of Kamloops Kraft has the best modification effect. Refining degree of Kamloops Kraft pulp increases 36.0 °SR when refining for 10,000 PFI revolutions, and the water retention value increases by 68.0%, the dye loading increases with 0.1 mg/g, the contact angle decreases by 4.5%. It illustrates that the fiber raw material with a thin cell wall would have a better effect of enzymatic modification and the wrapping way of microfibers would influence the effect of enzymatic modification.

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

KCl-assisted activation: Moringa oleifera branch-derived porous carbon for high performance supercapacitor

2021 ◽  
Vol 45 (12) ◽  
pp. 5712-5719
Author(s):  
Yongxiang Zhang ◽  
Peifeng Yu ◽  
Mingtao Zheng ◽  
Yong Xiao ◽  
Hang Hu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Porous Carbon ◽  
High Performance ◽  
Moringa Oleifera ◽  
High Specific Surface Area ◽  
Porous Carbons

Porous carbons with a high specific surface area (2314–3470 m2 g−1) are prepared via a novel KCl-assisted activation strategy for high-performance supercapacitor.

Carbon material with high specific surface area and high pseudocapacitance: Possible application in supercapacitors

2021 ◽  
Vol 319 ◽  
pp. 111063
Author(s):  
Yury M. Volfkovich ◽  
Valentin E. Sosenkin ◽  
Alexei Y. Rychagov ◽  
Alexandr V. Melezhik ◽  
Alexei G. Tkachev ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
High Specific Surface Area

Efficient conversion of CO2 to methane using thin-layer SiOx matrix anchored nickel catalysts

2019 ◽  
Vol 43 (33) ◽  
pp. 13217-13224 ◽  
Author(s):  
Xieyi Huang ◽  
Peng Wang ◽  
Zhichao Zhang ◽  
Shaoning Zhang ◽  
Xianlong Du ◽  
...  
Keyword(s):  
Thin Layer ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Geometric Structure ◽  
Nickel Catalysts ◽  
High Specific Surface Area ◽  
Efficient Conversion

Thin-layer SiOx matrix anchored nickel catalysts with high specific surface area and a unique electronic/geometric structure were fabricated for efficient CO2 methanation.

High specific surface area LaFeCo perovskites—Synthesis by nanocasting and catalytic behavior in the reduction of NO with CO

2009 ◽  
Vol 90 (3-4) ◽  
pp. 441-450 ◽  
Author(s):  
R.K.C. de Lima ◽  
M.S. Batista ◽  
M. Wallau ◽  
E.A. Sanches ◽  
Y.P. Mascarenhas ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Catalytic Behavior ◽  
Reduction Of No
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