The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform

Freddy Yin Chiang Boey - One of the best experts on this subject based on the ideXlab platform.

  • aqueous tape casting of 10 mol gd2o3 doped ceo2 nano particles
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006
    Co-Authors: Freddy Yin Chiang Boey
    Abstract:

    The aqueous tape casting process was systematically developed and investigated for the tape casting of 10 mol%-Gd2O3-doped CeO2 nanoparticles. This study focused on obtaining the optimum slurry formulations and on the effects of the processing parameters such as the stability, the rheology and the wetting properties on the tape characteristics. High solid loading (55 vol.%) and stable slurries of 10GDC nano-particles were achieved using poly(acrylic acid) (PAA) as a dispersant; poly(vinyl alcohol) (PVA) as a binder; poly(ethylene glycol) (PEG) as a plasticizer; octanol as a Defoamer and 2,4,7,9-tetramethyl-5-decyne-4,7-diol ethoxylate as a surfactant. The pH values of the slurries were maintained in the range of 9.0–10.0. Homogeneous, defect-free green tapes (thickness 150–200m) with smooth surface and high relative green density (51.5%) were thus successfully obtained. © 2006 Elsevier B.V. All rights reserved.

Lifang Jiang - One of the best experts on this subject based on the ideXlab platform.

  • the addition of ethanol as Defoamer in fermentation of rhamnolipids
    Journal of Chemical Technology & Biotechnology, 2012
    Co-Authors: Ruyi Sha, Qin Meng, Lifang Jiang
    Abstract:

    BACKGROUND: Rhamnolipids biosurfactants mainly produced by Pseudomonas aeruginosa have a wide range of potential applications. However, production of rhamnolipids on a large scale is constrained by severe foaming in fermentation. This study addressed the applicability of organic solvents as both Defoamer and carbon substrate in rhamnolipids fermentation. RESULTS: In this work, although isopropanol and n-butanol performed better defoaming activities against rhamnolipid-induced foams, ethanol was focused on as a potential Defoamer due to its high bioavailability and low toxicity in a shaking culture of P. aeruginosa ZJU. The most appropriate dose of ethanol addition was determined to be 1% (v/v) and the best time for addition was after 48 h of culture in shaking flasks. The capability of ethanol to control foaming was further illustrated during rhamnolipids fermentation in 2 L and 50 L bioreactors. In both fermentations, the addition of ethanol not only suppressed severe foaming but also supported cell growth. CONCLUSIONS: The use of ethanol as a Defoamer is a potential strategy to avoid undesirable foam in fermentation of biosurfactant. Copyright © 2012 Society of Chemical Industry

Chunyan Yang - One of the best experts on this subject based on the ideXlab platform.

  • nanoparticle as a novel foam controller for enhanced protein separation from sweet potato starch wastewater
    Separation and Purification Technology, 2019
    Co-Authors: Lixue Jin, Wei Liu, Di Huang, Chunyan Yang
    Abstract:

    Abstract This is an article describing a novel technology where hydrophobic nanoparticle acts as a foam controller to facilitate protein separation. Valuable sweet potato protein (SPP), a protein model, mainly exits in sweet potato starch wastewater (SPSW), and its separation is desperately needed to enable a sustainable utilization of waste and reduce the environmental burden. We firstly used hydrophobic silica nanoparticle (SNP) in situ modified by dodecyl dimethyl betaine (BS12) as a foam stabilizer instead of surfactants to improve SPSW foam stability. Somewhat unexpectedly, the particle also intensified the interfacial adsorption of SPP. Subsequently, a foam separation column with a vertical ellipsoid-shaped channel (VEC) was proposed to gently strengthen foam drainage and then enhance the enrichment ratio of SPP (ESPP). Most importantly, the negative impact of VEC on the recovery percentage of SPP (RSPP) was found to be negligible in the presence of modified SNP because it maintained the film thickness. After the foam separation, unmodified SNP served as a Defoamer to accelerate bubble breakage. Eventually, RSPP and ESPP reached 80.6 ± 4.0% and 9.1 ± 0.5, respectively, using the SNP as a foam controller. We expect this technology to be a complementary and/or alternative strategy for protein separation.

Ruyi Sha - One of the best experts on this subject based on the ideXlab platform.

  • the addition of ethanol as Defoamer in fermentation of rhamnolipids
    Journal of Chemical Technology & Biotechnology, 2012
    Co-Authors: Ruyi Sha, Qin Meng, Lifang Jiang
    Abstract:

    BACKGROUND: Rhamnolipids biosurfactants mainly produced by Pseudomonas aeruginosa have a wide range of potential applications. However, production of rhamnolipids on a large scale is constrained by severe foaming in fermentation. This study addressed the applicability of organic solvents as both Defoamer and carbon substrate in rhamnolipids fermentation. RESULTS: In this work, although isopropanol and n-butanol performed better defoaming activities against rhamnolipid-induced foams, ethanol was focused on as a potential Defoamer due to its high bioavailability and low toxicity in a shaking culture of P. aeruginosa ZJU. The most appropriate dose of ethanol addition was determined to be 1% (v/v) and the best time for addition was after 48 h of culture in shaking flasks. The capability of ethanol to control foaming was further illustrated during rhamnolipids fermentation in 2 L and 50 L bioreactors. In both fermentations, the addition of ethanol not only suppressed severe foaming but also supported cell growth. CONCLUSIONS: The use of ethanol as a Defoamer is a potential strategy to avoid undesirable foam in fermentation of biosurfactant. Copyright © 2012 Society of Chemical Industry

Bang Yeon Lee - One of the best experts on this subject based on the ideXlab platform.

  • Effects of a Defoamer on the compressive strength and tensile behavior of alkali-activated slag-based cementless composite reinforced by polyethylene fiber
    Composite Structures, 2017
    Co-Authors: Yun Lee, Jeong Il Choi, Hyeong-ki Kim, Bang Yeon Lee
    Abstract:

    Abstract The pore characteristic is a factor that influences on the mechanical properties of composites; the characteristic can be controlled by a Defoamer. This paper presents an experimental study on the effect of a Defoamer on the compressive strength and tensile behavior of alkali-activated slag-based cementless composite reinforced by polyethylene fiber. Three types of mixtures were made according to the amount of Defoamer and the compressive strength, tensile behavior, density, and pore size distribution were measured. Test results show that the compressive strength and tensile behavior of the alkali-activated slag-based polyethylene fiber reinforced composite investigated in this study can be improved by including a small amount of Defoamer in the composite.