The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Dongjie Yang - One of the best experts on this subject based on the ideXlab platform.
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formation of uniform colloidal spheres from lignin a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL−1, and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dispersions to “quench” the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (μ2/Γ2) of 0.022. The average aggregated number ( ) in each colloidal sphere and the average density ( ) are estimated to be 1.0 × 105 and 0.187 g cm−3. Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection.
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Formation of uniform colloidal spheres from lignin, a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Xueqing Qiu, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL −1 , and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dis-persions to " quench " the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (µ 2 /Γ 2) of 0.022. The average aggregated number () in each colloidal sphere and the average density () are estimated to be 1.0 × 10 5 and 0.187 g cm −3 . Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection. Introduction Amphiphilic polymers have attracted much attention because of their unique phase behaviors in selective solvents to form micelle nanostructure. 1 By a precise control of the environ-mental conditions, different micelle morphologies such as rods, spheres, stars and vesicles can be obtained. 2–5 These micelles show significant promise for use in drug delivery, substrate modifiers, energy storage, etc. 6–8 Generally, amphi-philic block or graft copolymers can form uniform micelles, but these copolymers can only be obtained by the use of living anionic polymerization and other rather sophisticated polymerization methods. 1,9,10 Recently, we were surprised to find that acetylated lignin (ACL), obtained from acetylation of alkali lignin, can also form colloidal spheres in selected solvents. To our knowledge, colloidal spheres formed from lignin derivatives have not been reported before. As the third most abundant renewable resource, lignin has attracted worldwide attention because of the growing crisis in oil resources. 11 Other than as a component of wood, lignin is mostly present as a by-product in spent liquor from the paper and pulping industry. 12 The pulping spent liquor is one of the main environmental hazards, and several studies have been done to reduce this pollution. Alkali recovery is the oldest but most common method to treat the spent liquor. 13 However, the facility cost of alkali recovery is huge and it is also a great waste of lignin renewable resources. Recycling of lignin is necessary and economical. For high value-added utilization of lignin resources, scien-tists have made a great deal of effort over the years. Lignin can be depolymerized to useful organic components. 14,15 Lignin can also be used as resin products by copolymerizing with the other polymers. 16 To serve as additives, lignin not only can be coated on polymer for special use such as preparing Pickering emulsions, 17 but also can be used as concrete water redu-cers, 18 water–coal–slurry dispersants 19 and pesticide disper-sants. 20 To utilize lignin with high efficiency, developing new methods for modifying alkali lignin is encouraged, and new properties of the corresponding lignin-based polymers need to Electronic supplementary information (ESI) available: Influence of the water content on the degree of colloidization and R h distributions of ACL solution fil-tered by syringe filter with different pore sizes at 60°. See
Yong Qian - One of the best experts on this subject based on the ideXlab platform.
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formation of uniform colloidal spheres from lignin a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL−1, and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dispersions to “quench” the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (μ2/Γ2) of 0.022. The average aggregated number ( ) in each colloidal sphere and the average density ( ) are estimated to be 1.0 × 105 and 0.187 g cm−3. Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection.
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Formation of uniform colloidal spheres from lignin, a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Xueqing Qiu, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL −1 , and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dis-persions to " quench " the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (µ 2 /Γ 2) of 0.022. The average aggregated number () in each colloidal sphere and the average density () are estimated to be 1.0 × 10 5 and 0.187 g cm −3 . Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection. Introduction Amphiphilic polymers have attracted much attention because of their unique phase behaviors in selective solvents to form micelle nanostructure. 1 By a precise control of the environ-mental conditions, different micelle morphologies such as rods, spheres, stars and vesicles can be obtained. 2–5 These micelles show significant promise for use in drug delivery, substrate modifiers, energy storage, etc. 6–8 Generally, amphi-philic block or graft copolymers can form uniform micelles, but these copolymers can only be obtained by the use of living anionic polymerization and other rather sophisticated polymerization methods. 1,9,10 Recently, we were surprised to find that acetylated lignin (ACL), obtained from acetylation of alkali lignin, can also form colloidal spheres in selected solvents. To our knowledge, colloidal spheres formed from lignin derivatives have not been reported before. As the third most abundant renewable resource, lignin has attracted worldwide attention because of the growing crisis in oil resources. 11 Other than as a component of wood, lignin is mostly present as a by-product in spent liquor from the paper and pulping industry. 12 The pulping spent liquor is one of the main environmental hazards, and several studies have been done to reduce this pollution. Alkali recovery is the oldest but most common method to treat the spent liquor. 13 However, the facility cost of alkali recovery is huge and it is also a great waste of lignin renewable resources. Recycling of lignin is necessary and economical. For high value-added utilization of lignin resources, scien-tists have made a great deal of effort over the years. Lignin can be depolymerized to useful organic components. 14,15 Lignin can also be used as resin products by copolymerizing with the other polymers. 16 To serve as additives, lignin not only can be coated on polymer for special use such as preparing Pickering emulsions, 17 but also can be used as concrete water redu-cers, 18 water–coal–slurry dispersants 19 and pesticide disper-sants. 20 To utilize lignin with high efficiency, developing new methods for modifying alkali lignin is encouraged, and new properties of the corresponding lignin-based polymers need to Electronic supplementary information (ESI) available: Influence of the water content on the degree of colloidization and R h distributions of ACL solution fil-tered by syringe filter with different pore sizes at 60°. See
Bert F Sels - One of the best experts on this subject based on the ideXlab platform.
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scalable synthesis of acidic mesostructured silica carbon nanocomposite catalysts by Rotary Evaporation
Chemcatchem, 2017Co-Authors: Ruyi Zhong, Li Peng, Remus Ion Iacobescu, Yiannis Pontikes, Bert F SelsAbstract:A practical and scalable synthesis for the mass production of well-ordered mesoporous silica-carbon composites by using a fast Rotary-Evaporation-induced self-assembly method in the absence of any additional support is presented.
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Scalable Synthesis of Acidic Mesostructured Silica–Carbon Nanocomposite Catalysts by Rotary Evaporation
Chemcatchem, 2016Co-Authors: Ruyi Zhong, Li Peng, Remus Ion Iacobescu, Yiannis Pontikes, Longlong Ma, Bert F SelsAbstract:A practical and scalable synthesis for the mass production of well-ordered mesoporous silica-carbon composites by using a fast Rotary-Evaporation-induced self-assembly method in the absence of any additional support is presented.
Hao Li - One of the best experts on this subject based on the ideXlab platform.
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formation of uniform colloidal spheres from lignin a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL−1, and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dispersions to “quench” the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (μ2/Γ2) of 0.022. The average aggregated number ( ) in each colloidal sphere and the average density ( ) are estimated to be 1.0 × 105 and 0.187 g cm−3. Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection.
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Formation of uniform colloidal spheres from lignin, a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Xueqing Qiu, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL −1 , and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dis-persions to " quench " the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (µ 2 /Γ 2) of 0.022. The average aggregated number () in each colloidal sphere and the average density () are estimated to be 1.0 × 10 5 and 0.187 g cm −3 . Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection. Introduction Amphiphilic polymers have attracted much attention because of their unique phase behaviors in selective solvents to form micelle nanostructure. 1 By a precise control of the environ-mental conditions, different micelle morphologies such as rods, spheres, stars and vesicles can be obtained. 2–5 These micelles show significant promise for use in drug delivery, substrate modifiers, energy storage, etc. 6–8 Generally, amphi-philic block or graft copolymers can form uniform micelles, but these copolymers can only be obtained by the use of living anionic polymerization and other rather sophisticated polymerization methods. 1,9,10 Recently, we were surprised to find that acetylated lignin (ACL), obtained from acetylation of alkali lignin, can also form colloidal spheres in selected solvents. To our knowledge, colloidal spheres formed from lignin derivatives have not been reported before. As the third most abundant renewable resource, lignin has attracted worldwide attention because of the growing crisis in oil resources. 11 Other than as a component of wood, lignin is mostly present as a by-product in spent liquor from the paper and pulping industry. 12 The pulping spent liquor is one of the main environmental hazards, and several studies have been done to reduce this pollution. Alkali recovery is the oldest but most common method to treat the spent liquor. 13 However, the facility cost of alkali recovery is huge and it is also a great waste of lignin renewable resources. Recycling of lignin is necessary and economical. For high value-added utilization of lignin resources, scien-tists have made a great deal of effort over the years. Lignin can be depolymerized to useful organic components. 14,15 Lignin can also be used as resin products by copolymerizing with the other polymers. 16 To serve as additives, lignin not only can be coated on polymer for special use such as preparing Pickering emulsions, 17 but also can be used as concrete water redu-cers, 18 water–coal–slurry dispersants 19 and pesticide disper-sants. 20 To utilize lignin with high efficiency, developing new methods for modifying alkali lignin is encouraged, and new properties of the corresponding lignin-based polymers need to Electronic supplementary information (ESI) available: Influence of the water content on the degree of colloidization and R h distributions of ACL solution fil-tered by syringe filter with different pore sizes at 60°. See
Yonghong Deng - One of the best experts on this subject based on the ideXlab platform.
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formation of uniform colloidal spheres from lignin a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL−1, and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dispersions to “quench” the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (μ2/Γ2) of 0.022. The average aggregated number ( ) in each colloidal sphere and the average density ( ) are estimated to be 1.0 × 105 and 0.187 g cm−3. Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection.
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Formation of uniform colloidal spheres from lignin, a renewable resource recovered from pulping spent liquor
Green Chemistry, 2014Co-Authors: Yong Qian, Xueqing Qiu, Yonghong Deng, Hao Li, Dongjie YangAbstract:Alkali lignin, recovered from the pulping black liquor, was chemically modified by acetylating, and then used as a biomass resource to prepare uniform colloidal spheres via self-assembly. The self-assembled structure and colloid formation mechanism of the acetylated lignin (ACL) were investigated by DLS, SLS, TEM, AFM, XPS, FTIR, elemental analysis and contact angle measurements. Results show that ACL colloidal spheres are obtained from gradual hydrophobic aggregation of ACL molecules, induced by continuously adding water into the ACL–THF solution. ACL molecules start to form colloidal spheres at a critical water content of 44 vol% when the initial concentration of ACL in THF is 1.0 mg mL −1 , and the colloidization process is completed at a water content of 67 vol%. An excessive amount of water is added into the dis-persions to " quench " the structures formed and then the ACL dispersion is treated by Rotary Evaporation for recycling THF and acquiring colloidal spheres. The ACL colloidal spheres have an of 110 nm with a polydispersity (µ 2 /Γ 2) of 0.022. The average aggregated number () in each colloidal sphere and the average density () are estimated to be 1.0 × 10 5 and 0.187 g cm −3 . Preparation of water-dispersive lignin nanoparticles opens up a green and valuable pathway for value-added utilization of lignin biomass recovered from pulping spent liquor, which is of great significance for both the utilization of renewable resources and environmental protection. Introduction Amphiphilic polymers have attracted much attention because of their unique phase behaviors in selective solvents to form micelle nanostructure. 1 By a precise control of the environ-mental conditions, different micelle morphologies such as rods, spheres, stars and vesicles can be obtained. 2–5 These micelles show significant promise for use in drug delivery, substrate modifiers, energy storage, etc. 6–8 Generally, amphi-philic block or graft copolymers can form uniform micelles, but these copolymers can only be obtained by the use of living anionic polymerization and other rather sophisticated polymerization methods. 1,9,10 Recently, we were surprised to find that acetylated lignin (ACL), obtained from acetylation of alkali lignin, can also form colloidal spheres in selected solvents. To our knowledge, colloidal spheres formed from lignin derivatives have not been reported before. As the third most abundant renewable resource, lignin has attracted worldwide attention because of the growing crisis in oil resources. 11 Other than as a component of wood, lignin is mostly present as a by-product in spent liquor from the paper and pulping industry. 12 The pulping spent liquor is one of the main environmental hazards, and several studies have been done to reduce this pollution. Alkali recovery is the oldest but most common method to treat the spent liquor. 13 However, the facility cost of alkali recovery is huge and it is also a great waste of lignin renewable resources. Recycling of lignin is necessary and economical. For high value-added utilization of lignin resources, scien-tists have made a great deal of effort over the years. Lignin can be depolymerized to useful organic components. 14,15 Lignin can also be used as resin products by copolymerizing with the other polymers. 16 To serve as additives, lignin not only can be coated on polymer for special use such as preparing Pickering emulsions, 17 but also can be used as concrete water redu-cers, 18 water–coal–slurry dispersants 19 and pesticide disper-sants. 20 To utilize lignin with high efficiency, developing new methods for modifying alkali lignin is encouraged, and new properties of the corresponding lignin-based polymers need to Electronic supplementary information (ESI) available: Influence of the water content on the degree of colloidization and R h distributions of ACL solution fil-tered by syringe filter with different pore sizes at 60°. See
