scholarly journals Novel Method to Simultaneously Adjust the Size and pH Value of Individual Microdroplets in Silicone Oil

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 114183-114190
Author(s):  
Gengchao Chen ◽  
Xianmin Zhang ◽  
Ning Li
Keyword(s):  
Silicone Oil ◽  
Ph Value ◽  
Novel Method

Selective Leaching Nickel from the Pre-Reduced Limonitic Laterite Ore at Atmospheric Pressure

2012 ◽  
Vol 560-561 ◽  
pp. 494-498
Author(s):  
Yong Feng Chang ◽  
Chuan Lin Fan ◽  
Bin Chuan Li ◽  
Xiu Jing Zhai ◽  
Ting An Zhang
Keyword(s):  
Atmospheric Pressure ◽  
Ph Value ◽  
Test Results ◽  
Selective Leaching ◽  
Nickel Extraction ◽  
Extraction Degree ◽  
Leaching Solution ◽  
Novel Method ◽  
Leaching Condition ◽  
Laterite Ore

In this paper a novel method for selective leaching nickel from pre-reduced laterite ore at atmospheric pressure was reported. The reduced calcine was leached in thin acid liquor to liberate the nickel and iron together firstly. By properly controlling the leaching condition, the leached iron ion could hydrolyze as goethite precipitate and regenerate the acid consumed in the leaching procedure. Finally, the nickel is selectively extracted into the leaching solution. The main factors in the leaching process, such as reduction degree of the laterite ore, acidity of the leaching solution were investigated as influence on the nickel extraction. The test results showed that selectively leaching of nickel could be achieved with an extraction degree up to 90% by reducing most of the iron in the lateritic ore to wuestite and controlling the pH value of the leaching solution below 2.5.

scholarly journals Effects and mechanistic aspects of absorbing organic compounds by coking coal

2017 ◽  
Vol 76 (9) ◽  
pp. 2280-2290 ◽  
Author(s):  
Kejia Ning ◽  
Junfeng Wang ◽  
Hongxiang Xu ◽  
Xianfeng Sun ◽  
Gen Huang ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Systemic Circulation ◽  
Batch Adsorption ◽  
Phenol Removal ◽  
Coal Consumption ◽  
Coking Coal ◽  
Freundlich Isotherms ◽  
Novel Method

Abstract Coal is a porous medium and natural absorbent. It can be used for its original purpose after adsorbing organic compounds, its value does not reduce and the pollutants are recycled, and then through systemic circulation of coking wastewater zero emissions can be achieved. Thus, a novel method of industrial organic wastewater treatment using adsorption on coal is introduced. Coking coal was used as an adsorbent in batch adsorption experiments. The quinoline, indole, pyridine and phenol removal efficiencies of coal adsorption were investigated. In addition, several operating parameters which impact removal efficiency such as coking coal consumption, oscillation contact time, initial concentration and pH value were also investigated. The coking coal exhibited properties well-suited for organics' adsorption. The experimental data were fitted to Langmuir and Freundlich isotherms as well as Temkin and Redlich–Peterson (R-P) models. The Freundlich isotherm model provided reasonable models of the adsorption process. Furthermore, the purification mechanism of organic compounds' adsorption on coking coal was analysed.

scholarly journals A Novel and Convenient Method for the Preparation and Activation of PRP without Any Additives: Temperature Controlled PRP

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Lijuan Du ◽  
Yong Miao ◽  
Xin Li ◽  
Panli Shi ◽  
Zhiqi Hu
Keyword(s):  
Convenient Method ◽  
Slow Release ◽  
Natural Fiber ◽  
Ph Value ◽  
Platelet Rich Plasma ◽  
Activation Process ◽  
Platelet Concentration ◽  
Novel Method ◽  
Human Blood Samples ◽  
Temperature Controlled

Platelet rich plasma (PRP) is a concentrate of autologous platelets which contain enrichment growth factors (GFs). However, the addition of exogenous anticoagulant and procoagulant may result in clinical side effects and raise the price of PRP. Herein, we report a novel method named temperature controlled PRP (t-PRP), in which exogenous additives are dispensable in the preparation and activation process. Human blood samples were processed by a two-step centrifugation process under hypothermic conditions (4°C) to obtain t-PRP and rewarming up to 37°C to activate t-PRP. Contemporary PRP (c-PRP) was processed as the control. t-PRP showed a physiological pH value between 7.46 and 7.48 and up to 6.58 ± 0.45-fold significantly higher platelet concentration than that of whole blood compared with c-PRP (4.06-fold) in the preparation process. Meanwhile, t-PRP also maintained a stable GF level between plasma and PRP. After activation, t-PRP demonstrated natural fiber scaffolding, which trapped more platelet and GFs, and exhibited a slow release and degradation rate of GFs. In addition, t-PRP exhibited the function of promoting wound healing. t-PRP is a novel and convenient method for the preparation and activation of PRP without any additives. Compared to c-PRP, t-PRP reflects more physiologic characteristics while maintaining high quality.

Selective Wettability Assisted Nanoliter Sample Generation via Electrowetting-Based Transportation

2007 ◽  
Author(s):  
Ting-Hsuan Chen ◽  
Chun-Min Su ◽  
Hsueh-Ching Chih ◽  
Cheng-Tsair Yang
Keyword(s):  
Glass Substrate ◽  
Water Droplet ◽  
Silicone Oil ◽  
Sample Volume ◽  
Complete Sample ◽  
Electrical Control ◽  
Coated Plate ◽  
Novel Method ◽  
Planar Electrodes ◽  
Definition Of

A novel method for nanoliter sample generation is demonstrated. In this method, an electrowetting-based platform (EWOD) was used to transport a water droplet which was sandwiched between two hydrophobic plates, and the transportation was carried out by the direct electrical control of planar electrodes on the bottom glass substrate. In contrast to the air environment in ordinary EWOD, silicone oil was employed to surround the water droplet to reduce the surface hysteresis; therefore, the fluidic operations including cutting and transportation became easier to manipulate. While the droplet was moving through the electrodes, a nanoliter sample was produced within the circular hydrophilic area which was patterned on the upper ITO coated plate. Hence, based on the definition of selective wettability areas, the sample volume is capable to be well generated and controlled. Besides, in order to optimize the dimensions of electrode, the dimensional criterion for complete sample generation was investigated. The result shows that larger electrode width permits more flexibility to determine the radius of hydrophilic circle. Upon this mechanism, the hydrophilic circle of 0.25 mm diameter is able to generate the tiny sample of 3.9 nanoliter. Since the dimensions of the hydrophilic circle could be easily patterned in tens microns, this method has the potential to achieve the picoliter sample via similar procedure. Consequently, according to the tiny sample generation and reduction of hysteresis, such method is well-suitable for the versatile applications.

The Research on the Application of Super Soft Amino-Modified Silicone Oil SM-20 for PET Fabrics

2011 ◽  
Vol 175-176 ◽  
pp. 677-680
Author(s):  
Yan Zhou
Keyword(s):  
Silicone Oil ◽  
Ph Value ◽  
Process Conditions ◽  
Excellent Performance ◽  
Experimental Conditions ◽  
Agent Based ◽  
Cure Time ◽  
Finishing Agent ◽  
Recovery Angle ◽  
Cure Temperature

This paper discussed the application of super soft amino-modified silicone oil SM-20 on the PET fabrics, and the experimental conditions such as the dosage of SM-20, cure temperature, cure time, pH value of the solution etc. were optimized according to the influences on the polyester (PET) fabrics after using SM-20 finishing agent. Based on IR spectrum and SEM, the SM-20 finishing agent was verified to possess excellent performance of the PET fabrics for the soft treatment, and the optimal process conditions were: SM-20 10 g/L, pH value 5.0-6.0 (adjusting by acetic acid). After soft treatment by SM-20, the drape coefficient, stiffness and strength of the fabric decreased, while the recovery angle and softness increased.

Preparation and Characterization of Cerium Hydrate Fiber

2007 ◽  
Vol 336-338 ◽  
pp. 2182-2185
Author(s):  
Jia Ming Sung ◽  
Sung En Lin ◽  
Wen Cheng J. Wei
Keyword(s):  
Aspect Ratio ◽  
Ph Value ◽  
Ambient Pressure ◽  
Key Factors ◽  
Aging Period ◽  
Starting Solution ◽  
Sodium Hydrate ◽  
Heating Treatment ◽  
Novel Method

Cerium hydrate fiber (CHF), which showed an aspect ratio greater than 100, was synthesized by a novel method, which used the mixing of cerium nitrate (Ce(NO3)3), sodium hydrate (NaOH) and citric acid (C6H8O7) synthesized at a relative low temperature and ambient pressure. The precipitates were characterized by XRD, SEM and TEM. The results showed that in addition to fibers, two morphologies could be obtained depending on the synthesizing conditions. Aging time and formulation were two key factors for the control of the aspect ratio of the precipitates. By a heating treatment at 600oC for 2 h, the homogenous and well-crystallized cerium dioxide (CeO2) fiber can be fabricated. The effects of synthesis parameters, such as the concentration of the starting solution, aging period, and pH value were reported and discussed.

scholarly journals Fast transient microjets induced by hemispherical cavitation bubbles

2015 ◽  
Vol 767 ◽  
pp. 31-51 ◽  
Author(s):  
Silvestre Roberto Gonzalez Avila ◽  
Chaolong Song ◽  
Claus-Dieter Ohl
Keyword(s):  
Cavitation Bubble ◽  
High Speed ◽  
Bubble Dynamics ◽  
Silicone Oil ◽  
Bubble Collapse ◽  
High Speed Photography ◽  
Drug Delivery Device ◽  
Spray Formation ◽  
Novel Method ◽  
Fast Transient

AbstractWe report on a novel method to generate fast transient microjets and study their characteristics. The simple device consists of two electrodes on a substrate with a hole in between. The side of the substrate with the electrodes is submerged in a liquid. Two separate microjets exit through the tapered hole after an electrical discharge is induced between the electrodes. They are formed during the expansion and collapse of a single cavitation bubble. The cavitation bubble dynamics as well as the jets were studied with high-speed photography at up to 500 000 f.p.s. With increasing jet velocity they become unstable and spray formation is observed. The jet created during expansion (first jet) is in most cases slower than the jet created during bubble collapse, which can reach up to $400~\text{m}~\text{s}^{-1}$. The spray exiting the orifice is at least in part due to the presence of cavitation in the microchannel as observed by high-speed recording. The effect of viscosity was tested using silicone oil of 10, 50 and 100 cSt. Interestingly, for all liquids the transition from a stable to an unstable jet occurs at $We\sim 4600$. We demonstrate that these microjets can penetrate into soft material; thus they can be potentially used as a needleless drug delivery device.

scholarly journals Mechanism for the Bio-Oxidation and Decomposition of Pentlandite: Implication for Nickel Bioleaching at Elevated pH

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 289 ◽  
Author(s):  
Jianzhi Sun ◽  
Jiankang Wen ◽  
Biao Wu ◽  
Bowei Chen
Keyword(s):  
Elemental Sulfur ◽  
Ph Value ◽  
Integrated Model ◽  
Mineral Surface ◽  
Ferric Ions ◽  
Ph Values ◽  
Novel Method ◽  
Sulfur Oxidizing ◽  
Leaching Bacteria

This work investigated the effects of Fe3+, H+ and adsorbed leaching bacteria on the bioleaching of pentlandite. Collectively, an integrated model for the oxidation and decomposition of pentlandite was built to describe the behaviors of different components in a bioleaching system. Proton ions and ferric ions could promote the break and oxidation of Ni-S and Fe-S bonds. The iron-oxidizing microorganisms could regenerate ferric ions and maintain a high Eh value. The sulfur-oxidizing microorganisms showed significant importance in the oxidation of polysulfide and elemental sulfur. The atoms in pentlandite show different modification pathways during the bioleaching process: iron transformed through a (Ni,Fe)9S8 → Fe2+ → Fe3+ → KFe3(SO4)2(OH)6 pathway; nickel experienced a transformation of (Ni,Fe)9S8 → NiS → Ni2+; sulfur modified through the pathway of S2−/S22− → Sn2− → S0 → SO32− → SO42−. During bioleaching, a sulfur-rich layer and jarosite layer formed on the mineral surface, and the rise of pH value accelerated the process. However, no evidence for the inhibition of the layers was shown in the bioleaching of pentlandite at pH 3.00. This study provides a novel method for the extraction of nickel from pentlandite by bioleaching at elevated pH values.

A Novel Method to Determine the Zeta Potential of Porous Substrates by Measuring the Deflection of Two Coupled Droplets

2009 ◽  
Author(s):  
Dominik P. J. Barz ◽  
Michael J. Vogel ◽  
Paul H. Steen
Keyword(s):  
Zeta Potential ◽  
Electroosmotic Flow ◽  
Ph Value ◽  
Bistable System ◽  
Aqueous Electrolytes ◽  
Volume Distribution ◽  
Liquid Boundary ◽  
Novel Method ◽  
Solid Liquid ◽  
Porous Substrates

We developed a novel method to determine the zeta potential of porous substrates saturated with a liquid. When two droplets are connected by their internal pressure, a bistable system in terms of volume distribution is established. Switching between the stable volume distributions may be realized by electroosmosis, arising near the solid/liquid boundary within the substrate when an electric potential difference is applied. Measuring the deflection of the liquid/gas interface of the droplets gives the strength of the induced electroosmotic flow. A model relates the induced electroosmotic flow to the zeta potential resulting from the combination of substrate and liquid. Measurements of a borosilicate substrate in contact with different aqueous electrolytes are performed. The results of the measurements clarify the influence of the ionic strength and pH value on the zeta potential. The results are also used to derive a new empirical correlation, reducing the number of parameters which have to be determined.

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