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Study on the two and three-parameter working stability regions of 3Y-TZP suspension

Science China(Technological Sciences) 2006年第5期49卷 547-568页

作者： CHEN Youqiang1, 2, ZHANG Xinni3, CHEN Sha’ou3 & QI Ping3 1. Department of Chemistry, Qingdao University, Qingdao 266071, China 2. Department of Chemistry, Tsinghua University, Beijing 100084, China 3. Department of Physics, Qingdao University, Qingdao 266071, China 1. Department of Chemistry Qingdao University Qingdao 266071 China 2. Department of Chemistry Tsinghua University Beijing 100084 China 3. Department of Physics Qingdao University Qingdao 266071 China

We determined the variation tendency of viscosity (η) at various solids load- ing (α) for 3Y-TZP suspension as a function of dispersant concentration (Cw) using vis- cosity measurement, measured the diameter of particles as a function of Cw in very dilute suspension using light scattering method, and obtained the surface features of the sedi- ment of suspension with different Cw using SEM. We also discussed the influence of the microstructure of adsorbed polymer layers on particles and their interactions in the dis- persing medium on the stability of suspension. Then two different stable states and two different unstable states for 3Y-TZP suspension were given. Accordingly, the (Cw, η), (Cw, α), and (α, η) two-parameter, and (Cw, α, η) three-parameter stability maps were con- structed. Based on the DLVO theory calculations, the dispersant concentration, particle distance (r), and interparticle potential energy (VT) maps with various solids loading for 3Y-TZP aqueous suspension were also constructed. In (Cw, r) two-parameter coordinate system, the stable motion region map for particles was established. The Cw, α, and VT,max (the highest potential energy) surface of the potential barrier map was obtained through calculation and simulation on the basis of the surfaces of Cw, r, VT maps introduced above. The (Cw, α) two-parameter stability map was then obtained from the Cw, α, VT,max map. The results showed that this theoretical map can qualitatively prove the experimentally obtained results—the existence of different dispersed states of particles in suspension system and the variation tendency of suspension stability with changing each parame- ter—were reasonable.

关键词： 3Y-TZP, suspension, stability, DLVO theory, interparticle potential energy.

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Effect of preoperative injection of carbon nanoparticle suspension on the outcomes of selected patients with mid-low rectal cancer

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Chinese Journal of Cancer 2016年第5期35卷 250-254页

作者： Xing-Mao Zhang Jian-Wei Liang Zheng Wang Jian-tao Kou Zhi-Xiang Zhou Department of Hepatobiliary Surgery Beijing Chaoyang HospitalCapital Medical University Department of Gastrointestinal Surgery Cancer HospitalChinese Academy of Medical Sciences & Peking Union Medical College

Background:Carbon nanoparticles show significant lymphatic tropism and can be used to identify lymph nodes surrounding mid-low rectal *** this study,we analyzed the effect of trans anal injection of a carbon nanoparticle suspension on the outcomes of patients with mid-low rectal cancer who underwent laparoscopic ***:We collected the data of 87 patients with mid-low rectal cancer who underwent laparoscopic resection between November 2014 and March 2015 at Cancer Hospital,Chinese Academy of Medical Sciences & Peking Union Medical *** 35 patients in the experimental group,the carbon nanoparticle suspension was injected transanally into the submucosa of the rectum around the tumor 30 min before the operation;52 patients in the control group underwent the operation directly without the injection of carbon nanoparticle *** then compared the operation outcomes between the two ***:In the experimental group,the rate of incomplete mesorectal excision was lower than that in the control group,but no significant difference was found(2.9%vs.7.7%,P = 0.342).The distance between the tumor and the circumferential resection margin was 5.8 ± 1.4 mm in the experimental group and 4.8 ±1.1 mm in the control group(P = 0.001).The mean number of lymph nodes removed was 28.2 ± 9.4 in the experimental group and 22.7 ± 7.3in the control group(P = 0.003);the mean number of lymph nodes smaller than 5 mm in diameter was 10.1 ± 7.5and 4.5 ±3.7,respectively(Psuspension improved the outcomes of patients who underwent laparoscopic resection for mid-low rectal cancer;it also improved the accuracy of pathologic ***

关键词： Carbon nanoparticle suspension, Rectal cancer

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Flow frictional characteristics of microencapsulated phase change material suspensions flowing through rectangular minichannels

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Science China(Technological Sciences) 2006年第4期49卷 445-456页

作者： Frank Dammel Peter Stephan Chair of Technical Thermodynamics Darmstadt University of Technology Germany

An experimental investigation was conducted on the laminar flow frictional characteristics of suspensions with microencapsulated phase change material (MEPCM) in water flowing through rectangular copper minichannels. The MEPCM was provided at an average particle size of 4.97 μm, and was mixed with distilled water to form suspen- sions with various mass concentrations ranging from 0 to 20%. The experiment was per- formed to explore the effect of MEPCM mass concentration on friction factor and pressure drop in the minichannels. The Reynolds number ranged from 200 to 2000 to provide laminar and transitional flows. It was found that the experimental data for the suspensions with 0 and 5% concentration agree well with the existing theoretical data for an incom- pressible, fully developed, laminar Newtonian flow. For the suspensions with mass con- centrations higher than 10%, there is an obvious increase in friction factor and pressure drop in comparison with laminar Newtonian flow.

关键词： microencapsulated phase change material suspension, friction factor, rectangular minichannel.

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Colloidal Behavior of Aqueous Montmorillonite suspensions in the Presence of Non-ionic Polymer

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Journal of Hydraulic Engineering 2015年第1期1卷 60-66页

作者： Mourad Gareche Nadjet Azril Leila Saoudi Jean Charles Dupin Ahmed Allal Noureddine Zeraibi LGPH Department of Oil Field University M'hamed Bougara of Boumerdes 35000 Algeria IPREM-EPCP Helioparc University of Pau and Contries of Adour 64053 France

In this paper, we characterized at first, the rheological behavior of the bentonite suspensions and the aqueous solutions of PEO （polyethylene oxide）. Then we are going to investigate the influence of this polymer in a water-based drilling fluid model （6% of bentonite suspension）. The objective is to exhibit how the non-ionic polymer with molecular weight 6×10^3 g/mol, of varying concentration mass （0.7%, 1%, 2% and 3%） significantly alter the rheological properties （yield stress, viscosity, loss and elastic modulus） of the bentonite suspensions. The rheological measurements made in simple shear and in dynamic on the mixture （water-bentonite-PEO）, showed rheological properties of bentonite suspensions both in the presence and absence of non-ionic polymer. The PEO presents an affinity for the bentonite particles slowing down their kinetic aggregation. The analysis by XRD （X-rays diffraction） also allowed understanding the structure of this mixture. It had revealed the intercalation between of the clay platelets on one hand, and the links bridges assured by the chains of polymer between bentonite particles beyond a critical concentration in PEO on the other hand.

关键词： Bentonite, PEO, suspension, rheology.

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