The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Mingsong Zhou - One of the best experts on this subject based on the ideXlab platform.
-
Influence of Lignosulfonates on the Stability of Dimethomorph Water Based Suspension
Advanced Materials Research, 2012Co-Authors: Yu Xia Pang, Ting Zhou, Mingsong ZhouAbstract:The dispersive effect of four Lignosulfonates (Kinsperse126, sodium Lignosulfonate, magnesium Lignosulfonate and a modified Lignosulfonate GCL4-1) on the stability of Dimethomorph (DMM) water based suspension with different particle sizes was investigated. DMM suspension without dispersant was unstable owing to the strong aggregation of particles, while the stability was increased after the addition of Lignosulfonate (LS), which can be adsorbed on the particle surface and weaken the aggregation of particles. Moreover, the higher sulfonated degree of LS, the better the dispersible ability was. Compared with LS of high sulfonated degree which could improve the zeta potential of DMM, LS with high molecular weight had larger adsorption capacity and steric effect on the pesticide particles. Associated with the dispersive behavior of DMM suspension, the electrostatic repulsion was found to be the more important factor impacting the stability of DMM suspension by comparison with the steric effect.
-
properties of sodium Lignosulfonate as dispersant of coal water slurry
Energy Conversion and Management, 2007Co-Authors: Dongjie Yang, Mingsong ZhouAbstract:In order to use Lignosulfonates (a by-product of pulp and paper processes) as an effective dispersant of coal water slurry five purified sodium Lignosulfonate (SL) samples with different molecular weights were prepared by fractionation using ultrafiltration and dialysis. The effect of SL on the apparent viscosity of coal water slurry (CWS) was investigated. The adsorption behavior of the SL on the coal water interface has much greater effect on the viscosity of coal water slurry. The higher adsorption amount and compact adsorption film of SL on the coal surface help reduce the viscosity of CWS, and the zeta potential is also an important factor, which is influenced by the sulfonic and carboxyl group contents of the Lignosulfonate molecule. Furthermore, the SL with its molecular weight ranging from 10,000 to 30,000 has both a higher adsorbed amount and zeta potential on the coal surface and the best effect on reducing the viscosity of the coal water slurry.
-
Properties of sodium Lignosulfonate as dispersant of coal water slurry
Energy Conversion and Management, 2007Co-Authors: Dongjie Yang, Mingsong Zhou, Xueqing Qiu, Hongming LouAbstract:In order to use Lignosulfonates (a by-product of pulp and paper processes) as an effective dispersant of coal water slurry five purified sodium Lignosulfonate (SL) samples with different molecular weights were prepared by fractionation using ultrafiltration and dialysis. The effect of SL on the apparent viscosity of coal water slurry (CWS) was investigated. The adsorption behavior of the SL on the coal water interface has much greater effect on the viscosity of coal water slurry. The higher adsorption amount and compact adsorption film of SL on the coal surface help reduce the viscosity of CWS, and the zeta potential is also an important factor, which is influenced by the sulfonic and carboxyl group contents of the Lignosulfonate molecule. Furthermore, the SL with its molecular weight ranging from 10,000 to 30,000 has both a higher adsorbed amount and zeta potential on the coal surface and the best effect on reducing the viscosity of the coal water slurry. © 2007 Elsevier Ltd. All rights reserved.
Fatima Charrierel Bouhtoury - One of the best experts on this subject based on the ideXlab platform.
-
study of thermal durability properties of tannin Lignosulfonate adhesives
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Lucie Chupin, Bertrand Charrier, A Pizzi, Arturo Perdomo, Fatima Charrierel BouhtouryAbstract:This paper aims to study certain aspects of the preparation of tannin–lignin adhesives. Mimosa tannins and Lignosulfonates were used in wood adhesives formulation to substitute resins based on formaldehyde. Two ammonium Lignosulfonates and two sodium Lignosulfonates were glyoxalated to be more reactive. The thermal stability of the Lignosulfonates before and after glyoxalation was analysed by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The proportion of mimosa tannins and sodium Lignosulfonates varied from 20 % tannins to 60 % tannins. 40 % of mimosa tannins were mixed with either glyoxalated sodium Lignosulfonates or glyoxalated ammonium Lignosulfonates. The thermal properties of the resins were studied by TG, DSC and thermomechanical analysis (TMA). The results showed that after glyoxalation, the degradation of Lignosulfonates started at 125 °C instead of 171 °C for the non-glyoxalated Lignosulfonates. The results obtained showed that the 40 mass% tannins resin was the most efficient. The TMA results showed that the curing of the resins started at 100–110 °C. The TG and DSC results of the cured resins showed a thermal stability of the adhesives up to approximately 200 °C.
-
Study of thermal durability properties of tannin–Lignosulfonate adhesives
Journal of Thermal Analysis and Calorimetry, 2014Co-Authors: Lucie Chupin, Bertrand Charrier, A Pizzi, Arturo Perdomo, Fatima Charrierel BouhtouryAbstract:This paper aims to study certain aspects of the preparation of tannin–lignin adhesives. Mimosa tannins and Lignosulfonates were used in wood adhesives formulation to substitute resins based on formaldehyde. Two ammonium Lignosulfonates and two sodium Lignosulfonates were glyoxalated to be more reactive. The thermal stability of the Lignosulfonates before and after glyoxalation was analysed by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The proportion of mimosa tannins and sodium Lignosulfonates varied from 20 % tannins to 60 % tannins. 40 % of mimosa tannins were mixed with either glyoxalated sodium Lignosulfonates or glyoxalated ammonium Lignosulfonates. The thermal properties of the resins were studied by TG, DSC and thermomechanical analysis (TMA). The results showed that after glyoxalation, the degradation of Lignosulfonates started at 125 °C instead of 171 °C for the non-glyoxalated Lignosulfonates. The results obtained showed that the 40 mass% tannins resin was the most efficient. The TMA results showed that the curing of the resins started at 100–110 °C. The TG and DSC results of the cured resins showed a thermal stability of the adhesives up to approximately 200 °C.
Dongjie Yang - One of the best experts on this subject based on the ideXlab platform.
-
Adsorption Mechanism of Lignosulfonate at the Air/Liquid Interface
Journal of the Brazilian Chemical Society, 2015Co-Authors: Dongjie YangAbstract:Lignosulfonate is a type of natural polymer surfactant. Its capability to reduce the surface tension of aqueous solution depends on its adsorption configuration at the air/liquid interface. The dynamic surface tension, the air/liquid interfacial film properties of Lignosulfonate at different solution concentrations, pH values and ionic strengths had been measured in the present work. The results showed that the adsorption equilibrium of Lignosulfonate at the air/liquid cannot be achieved in a short period; the diffusion coefficient of Lignosulfonate from the liquid to the air/liquid interface decreased with the increasing of pH value, while it increased with the increasing of ionic strength. Lignosulfonate could form soluble monomolecular film at the air/liquid interface, whereas the film was unstable. The stability of Lignosulfonate monomolecular film became poor with the increasing of solution concentration, ionic strength and decreasing of pH value. Combining with our previous research results, the adsorption mechanism of Lignosulfonate at the air/liquid interface was proposed.
-
Isolation of Lignosulfonate with low polydispersity index
Chinese Chemical Letters, 2010Co-Authors: Xin Ping Ouyang, Pan Zhang, Yonghong Deng, Dongjie YangAbstract:Abstract Lignosulfonate with low polydispersity index of 1.178–1.210 was isolated by gel column chromatography of Sephacryl S-100 eluted with 0.2 mol/L of NaNO 3 aqueous solution, whereas nearly monodisperse ligosulfonate fraction with polydispersity of 1.067 can be obtained after chromatographic separation twice. This method provides an available approach to investigate the structure and characteristics of Lignosulfonate.
-
adsorption and desorption behaviors of Lignosulfonate during the self assembly of multilayers
Bioresources, 2010Co-Authors: Yonghong Deng, Xin Ping Ouyang, Yuan Wu, Yong Qian, Dongjie YangAbstract:Self-assembled multilayers were fabricated from Lignosulfonate (LS) and poly(diallyldimethylammonium chloride) (PDAC), and the adsorption and desorption behaviors of LS on the LS/PDAC multilayers under different pH conditions were intensively investigated. Results showed that the adsorption and desorption behaviors were controlled by electrostatic attraction, hydrophobic interaction, and changes in the microstructure, which depended on solution pH. Lignosulfonates exist as colloids in solutions at low pH because of a hydrophobic interactions, and the LS colloids adsorbed on the PDAC layer because of electrostatic attraction. LS colloids started to disassociate at pH 3.5, resulting in an abrupt rise of the adsorption rate, a sharp decrease of the adsorbed amount, and a steep reduction in the surface roughness. Desorption behaviors of LS multilayers were related to the pH values of both LS dipping solution for self-assembly and the immersing solution for post-preparation treatment. Desorption of LS could be induced by a weakening of electrostatic attraction or hydrophobic interaction. A significant desorption occurred only when LS colloids dissociated in the multilayers. LS colloids were harder to dissociate in the multilayers than in the solutions because of electrostatic attraction between LS and PDAC.
-
properties of sodium Lignosulfonate as dispersant of coal water slurry
Energy Conversion and Management, 2007Co-Authors: Dongjie Yang, Mingsong ZhouAbstract:In order to use Lignosulfonates (a by-product of pulp and paper processes) as an effective dispersant of coal water slurry five purified sodium Lignosulfonate (SL) samples with different molecular weights were prepared by fractionation using ultrafiltration and dialysis. The effect of SL on the apparent viscosity of coal water slurry (CWS) was investigated. The adsorption behavior of the SL on the coal water interface has much greater effect on the viscosity of coal water slurry. The higher adsorption amount and compact adsorption film of SL on the coal surface help reduce the viscosity of CWS, and the zeta potential is also an important factor, which is influenced by the sulfonic and carboxyl group contents of the Lignosulfonate molecule. Furthermore, the SL with its molecular weight ranging from 10,000 to 30,000 has both a higher adsorbed amount and zeta potential on the coal surface and the best effect on reducing the viscosity of the coal water slurry.
-
Properties of sodium Lignosulfonate as dispersant of coal water slurry
Energy Conversion and Management, 2007Co-Authors: Dongjie Yang, Mingsong Zhou, Xueqing Qiu, Hongming LouAbstract:In order to use Lignosulfonates (a by-product of pulp and paper processes) as an effective dispersant of coal water slurry five purified sodium Lignosulfonate (SL) samples with different molecular weights were prepared by fractionation using ultrafiltration and dialysis. The effect of SL on the apparent viscosity of coal water slurry (CWS) was investigated. The adsorption behavior of the SL on the coal water interface has much greater effect on the viscosity of coal water slurry. The higher adsorption amount and compact adsorption film of SL on the coal surface help reduce the viscosity of CWS, and the zeta potential is also an important factor, which is influenced by the sulfonic and carboxyl group contents of the Lignosulfonate molecule. Furthermore, the SL with its molecular weight ranging from 10,000 to 30,000 has both a higher adsorbed amount and zeta potential on the coal surface and the best effect on reducing the viscosity of the coal water slurry. © 2007 Elsevier Ltd. All rights reserved.
Lucie Chupin - One of the best experts on this subject based on the ideXlab platform.
-
study of thermal durability properties of tannin Lignosulfonate adhesives
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Lucie Chupin, Bertrand Charrier, A Pizzi, Arturo Perdomo, Fatima Charrierel BouhtouryAbstract:This paper aims to study certain aspects of the preparation of tannin–lignin adhesives. Mimosa tannins and Lignosulfonates were used in wood adhesives formulation to substitute resins based on formaldehyde. Two ammonium Lignosulfonates and two sodium Lignosulfonates were glyoxalated to be more reactive. The thermal stability of the Lignosulfonates before and after glyoxalation was analysed by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The proportion of mimosa tannins and sodium Lignosulfonates varied from 20 % tannins to 60 % tannins. 40 % of mimosa tannins were mixed with either glyoxalated sodium Lignosulfonates or glyoxalated ammonium Lignosulfonates. The thermal properties of the resins were studied by TG, DSC and thermomechanical analysis (TMA). The results showed that after glyoxalation, the degradation of Lignosulfonates started at 125 °C instead of 171 °C for the non-glyoxalated Lignosulfonates. The results obtained showed that the 40 mass% tannins resin was the most efficient. The TMA results showed that the curing of the resins started at 100–110 °C. The TG and DSC results of the cured resins showed a thermal stability of the adhesives up to approximately 200 °C.
-
Study of thermal durability properties of tannin–Lignosulfonate adhesives
Journal of Thermal Analysis and Calorimetry, 2014Co-Authors: Lucie Chupin, Bertrand Charrier, A Pizzi, Arturo Perdomo, Fatima Charrierel BouhtouryAbstract:This paper aims to study certain aspects of the preparation of tannin–lignin adhesives. Mimosa tannins and Lignosulfonates were used in wood adhesives formulation to substitute resins based on formaldehyde. Two ammonium Lignosulfonates and two sodium Lignosulfonates were glyoxalated to be more reactive. The thermal stability of the Lignosulfonates before and after glyoxalation was analysed by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The proportion of mimosa tannins and sodium Lignosulfonates varied from 20 % tannins to 60 % tannins. 40 % of mimosa tannins were mixed with either glyoxalated sodium Lignosulfonates or glyoxalated ammonium Lignosulfonates. The thermal properties of the resins were studied by TG, DSC and thermomechanical analysis (TMA). The results showed that after glyoxalation, the degradation of Lignosulfonates started at 125 °C instead of 171 °C for the non-glyoxalated Lignosulfonates. The results obtained showed that the 40 mass% tannins resin was the most efficient. The TMA results showed that the curing of the resins started at 100–110 °C. The TG and DSC results of the cured resins showed a thermal stability of the adhesives up to approximately 200 °C.
Xiaohui Yang - One of the best experts on this subject based on the ideXlab platform.
-
synthesis of foaming resol resin modified with oxidatively degraded Lignosulfonate
Industrial Crops and Products, 2013Co-Authors: Lihong Hu, Yonghong Zhou, Meng Zhang, Xiaohui YangAbstract:Abstract A new method of introducing Lignosulfonate into foaming resol resin was explored in the present work. Lignosulfonate was oxidatively degraded to phenolic compounds in water medium (pH = 10), Lignosulfonate concentration (based on total weight of Lignosulfonate and water) was 50%. Effects of degradation temperature, reaction time, and H2O2 dosage on number average molecular weight (Mw) and weight average molecular weight (Mn) of oxidatively degraded Lignosulfonate (ODL) were investigated. The optimal degradation conditions were: temperature was about 60 °C, reaction time 2 h, and H2O2 concentration (based on weight of Lignosulfonate) 6 wt%, where Mw and Mn attained a minimum 998 and 493, respectively. Foaming resol resin modified with ODL was synthesized under an alkaline condition. Phenolic foam made from modified resol resin (30 wt% replacement of phenol by ODL) and other chemicals possessed satisfied properties.