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On the growth morphous of capillaries and tissue
in porous silk fibroin films
BAI Lun, ZUO Bao-qi, GUAN Guo-ping, DAI Li-xing, CHEN Yong-zhen, ZHOU Zheng-yu, XU Jian-mei, WU Zhen-yu
Front. Mater. Sci.. 2008, 2 (3): 266-270.
https://doi.org/10.1007/s11706-008-0055-z
In this study, the porous silk fibroin film (PSFF) is implanted into the body of a rat. Ten days later, the growing state of the capillaries in the material was observed, and the growing law of the capillaries in porous material is discussed to better understand the growing state of the peripheral tissue and cells around the material. The fact that the PSFF creates a beneficial environment for the growth of the capillaries in the tissue is confirmed, and the good growing states of the new skeleton muscle and the hypodermal tissue are also observed. This provides basic experimental results for the design of the PSFFs, which is a new medical biomaterial.
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Growth and passivation of aluminum etch tunnels
at on-off controlling DC
WANG Mei, HE Ye-dong
Front. Mater. Sci.. 2008, 2 (3): 301-305.
https://doi.org/10.1007/s11706-008-0047-z
In order to control the length of tunnels within Al foil etched in HCl-H2SO4 solutions, the influence of on-off control of the DC on growth and passivation of tunnels has been investigated. From SEM of oxide replicas of tunnels, it was found that, in a given etchant solution at a special temperature, the longest tunnel length depended only on the turn-on interval of DC, and the number of pits was determined by the total electricity of the DC. The corresponding mechanism is that the potential of Al foil changed rapidly at the point of the switch of DC by the result according to the anodic polarization curve and potential-time (E-t) response curves. The moment the DC was switched on, the potential increased immediately over pitting potential, leading to nucleation of pits at the surface and growth of tunnels at special lengths. When the DC was switched off, the potential rapidly decreased to a passive state, leading to the cessation of nucleation and the death of tunnels. Therefore, the longest tunnel length can be controlled and a non-piercing layer can be obtained. Furthermore, consequent etching of Al foil by the on-off control of the DC is beneficial for maintaining a good mechanical strength.
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