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Sun X, Zhou B, Cai Z. Determination of the adsorption density of high molecular weight polymers on ultrafine sub-micron particles. JOURNAL OF POLYMER RESEARCH 2023. [DOI: 10.1007/s10965-023-03452-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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2
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Ataie M, Sutherland K, Pakzad L, Fatehi P. Assembly of aluminum oxide particles with lignin-acrylic acid polymer in saline systems. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129322] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Influence of molecular weight on polyacrylic acid flocculation of sub-micron titanium dioxide. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125195] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Tian Q, Zhang D, Li N, Henderson MJ, Li Q, Royal G, Courtois J, Yan M, Zhu Z, Almásy L. Structural Study of Polystyrene- b-poly(acrylic acid) Micelles Complexed with Uranyl: A SAXS Core-Shell Model Analysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4820-4826. [PMID: 32275446 DOI: 10.1021/acs.langmuir.9b03934] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The interactions between natural colloidal organic matter and actinides in solutions are complex and not fully understood. In this work, a crew-cut polystyrene-b-poly(acry1ic acid) (PS-b-PAA) micelle is proposed as a model particle for humic acid (HA) colloid with the aim to better understand the sequestration, aggregation, and mobility of HA colloids in the presence of uranyl ions. The effects of uranyl ions on the structure of PS29k-b-PAA5k micelles in aqueous solution were mainly investigated by synchrotron small-angle X-ray scattering. A core-shell model, accounting for the thickness and contrast changes of the PAA corona induced by the adsorption of uranyl, was employed to analyze the scattering data. A combination of transmission electron microscopy, dynamic light scattering, and zetametry showed a strong affinity of uranyl ions to PAA segments in water at pH 4-5 that resulted in the shrinkage and improved contrast of the PAA corona, as well as colloidal destabilization at a high uranyl concentration.
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Affiliation(s)
- Qiang Tian
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Di Zhang
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Na Li
- National Facility for Protein Science in Shanghai, Zhangjiang Laboratory, No. 233 Haike Road, Shanghai 201204, China
| | - Mark Julian Henderson
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Qintang Li
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Guy Royal
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
- CNRS, DCM, University Grenoble Alpes, 38000 Grenoble, France
| | - Jérémie Courtois
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Minhao Yan
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
| | - Zhichao Zhu
- Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, China
| | - László Almásy
- State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, P.O. Box 49, H-1525 Budapest, Hungary
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Lapointe M, Barbeau B. Understanding the roles and characterizing the intrinsic properties of synthetic vs. natural polymers to improve clarification through interparticle Bridging: A review. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115893] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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6
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Flocculation kinetics and dewatering studies of quaternized cellulose derived from oil palm empty fruit bunches. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0250-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7
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Mittal H, Kumar V, Alhassan SM, Ray SS. Modification of gum ghatti via grafting with acrylamide and analysis of its flocculation, adsorption, and biodegradation properties. Int J Biol Macromol 2018; 114:283-294. [DOI: 10.1016/j.ijbiomac.2018.03.131] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 02/25/2018] [Accepted: 03/21/2018] [Indexed: 11/30/2022]
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8
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Pal P, Pandey JP, Sen G. Synthesis, characterization and flocculation studies of a novel graft copolymer towards destabilization of carbon nano-tubes from effluent. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.01.059] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Sarkar AK, Ghorai S, Patra AS, Mishra BK, Mandre N, Pal S. Modified amylopectin based flocculant for the treatment of synthetic effluent and industrial wastewaters. Int J Biol Macromol 2015; 72:356-63. [DOI: 10.1016/j.ijbiomac.2014.08.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 08/04/2014] [Accepted: 08/07/2014] [Indexed: 10/24/2022]
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10
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Pathak M, Devi A, Sarma HK, Lal B. Application of bioflocculating property of Pseudomonas aeruginosa strain IASST201 in treatment of oil-field formation water. J Basic Microbiol 2014; 54:658-69. [PMID: 24740803 DOI: 10.1002/jobm.201301011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 03/18/2014] [Indexed: 11/06/2022]
Abstract
A bioflocculating activity of 89.8% was depicted by an activated sludge-borne bacteria Pseudomonas aeruginosa strain IASST201 with a yield of bioflocculant of 2.68 g L(-1) obtained from production media broth after optimization of different parameters. The highest bioflocculation efficiency was found at the pre-stationary phase of the bacterial growth period in the production media broth at 96th hour examined from a growth-flocculation kinetics study. 85.67% of bioflocculation was observed in oil-field formation water, with a separation of 68.7% of aliphatic hydrocarbon contents of the formation water after the application of the bacterial bioflocculant by entrapment mechanism with formation of flocs which was analyzed and examined comparatively through gas-chromatography. Extensive removal of heavy metal contents of the oil-field formation water due to bioflocculation was estimated by Atomic Absorption Spectrophotometer (AAS). The SEM and AFM studies declare the extracellular polymeric nature of the bioflocculant produced by this bacterium clumped within bacterial biofilm supported with FTIR study of the extracted bioflocculant.
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Affiliation(s)
- Mihirjyoti Pathak
- Environmental Chemistry Laboratory, Resource Management and Environment Section, Life Science Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India
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11
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Buyel JF, Fischer R. Flocculation increases the efficacy of depth filtration during the downstream processing of recombinant pharmaceutical proteins produced in tobacco. PLANT BIOTECHNOLOGY JOURNAL 2014; 12:240-52. [PMID: 24165151 DOI: 10.1111/pbi.12132] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 09/10/2013] [Accepted: 09/11/2013] [Indexed: 05/23/2023]
Abstract
Flocculation is a cost-effective method that is used to improve the efficiency of clarification by causing dispersed particles to clump together, allowing their removal by sedimentation, centrifugation or filtration. The efficacy of flocculation for any given process depends on the nature and concentration of the particulates in the feed stream, the concentration, charge density and length of the flocculant polymer, the shear rate, the properties of the feed stream (e.g. pH and ionic strength) and the properties of the target products. We tested a range of flocculants and process conditions using a design of experiments approach to identify the most suitable polymers for the clarification step during the production of a HIV-neutralizing monoclonal antibody (2G12) and a fluorescent marker protein (DsRed) expressed in transgenic tobacco leaves. Among the 23 different flocculants we tested, the greatest reduction in turbidity was achieved with Polymin P, a branched, cationic polyethylenimine with a charge density of 13.0 meq/g. This flocculant reduced turbidity by more than 90% under a wide range of process conditions. We developed a model that predicted its performance under different process conditions, and this enabled us to increase the depth filter capacity three-sevenfold depending on the process scale, depth filter type and plant species. The costs of filter consumables were reduced by more than 50% compared with a process without flocculant, and there was no loss of recovery for either 2G12 or DsRed.
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Affiliation(s)
- Johannes F Buyel
- Institute for Molecular Biotechnology, RWTH Aachen University, Aachen, Germany
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12
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Li J, Song X, Pan J, Zhong L, Jiao S, Ma Q. Adsorption and flocculation of bentonite by chitosan with varying degree of deacetylation and molecular weight. Int J Biol Macromol 2013; 62:4-12. [DOI: 10.1016/j.ijbiomac.2013.08.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 08/11/2013] [Accepted: 08/16/2013] [Indexed: 10/26/2022]
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13
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Ghorai S, Sarkar A, Panda AB, Pal S. Evaluation of the Flocculation Characteristics of Polyacrylamide Grafted Xanthan Gum/Silica Hybrid Nanocomposite. Ind Eng Chem Res 2013. [DOI: 10.1021/ie400550m] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Soumitra Ghorai
- Polymer Chemistry Laboratory,
Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India
| | - Asish Sarkar
- Polymer Chemistry Laboratory,
Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India
| | - Asit Baran Panda
- Nano-structure Materials Division, Central Glass & Ceramic Research Institute (CSIR-CGCRI), Kolkata 700032, India
| | - Sagar Pal
- Polymer Chemistry Laboratory,
Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India
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14
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Yang Z, Yang H, Jiang Z, Huang X, Li H, Li A, Cheng R. A new method for calculation of flocculation kinetics combining Smoluchowski model with fractal theory. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.01.058] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Abstract
AbstractThe influence of temperature on the adsorption of polyvinyl alcohol (PVA) on a silica surface was studied from 15–35°C. The structure of the polymer adsorption layer was determined from spectrophotometric, viscosity and thermogravimetric measurements. The amount of PVA adsorbed, macromolecules’ conformation in solution, thickness of the polymer adsorption layer, and changes in the heating curve of SiO2 with adsorbed polymer were determined. Temperature influences the PVA chain conformation in solution and the structure of the polymer adsorption layer. A temperature rise causes relaxation of polymer coils which results in an increase in the linear dimensions of PVA chains in the solution, the creation of a thicker adsorption layer, and an increase in polymer adsorbed. Polymer adsorption on the silica surface also causes changes in the heating curve of these systems. The mass losses due to heating are smallest for the systems obtained at 15°C because the least polymer is adsorbed at this temperature.
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16
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Yang Z, Shang Y, Huang X, Chen Y, Lu Y, Chen A, Jiang Y, Gu W, Qian X, Yang H, Cheng R. Cationic content effects of biodegradable amphoteric chitosan-based flocculants on the flocculation properties. J Environ Sci (China) 2012; 24:1378-1385. [PMID: 23513678 DOI: 10.1016/s1001-0742(11)60962-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A series of biodegradable amphoteric chitosan-based flocculants (3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CTA) modified carboxymethyl chitosan, denoted as CMC-CTA) with different substitution degrees of CTA were prepared successfully. The content of carboxymethyl groups in each CMC-CTA sample was kept almost constant. The solubility of the various flocculants showed that, higher cationic content of flocculants caused a better solubility. The flocculation experiments using kaolin suspension as synthetic water at the laboratory scale indicated that the substitution degree of CTA was one of the key factors for the flocculation properties. With the increase of cationic content, the flocculants were demonstrated better flocculation performance and lower dosage requirement. Flocculation kinetics model of particles collisions combining zeta potential and turbidity measurements was employed to investigate the effects of the cationic content of the flocculants on the flocculation properties from the viewpoint of flocculation mechanism in detail. Furthermore, flocculation performance using raw water from Zhenjiang part of Yangtze River at the pilot scale showed the similar effects to those at the laboratory scale.
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Affiliation(s)
- Zhen Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, China.
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17
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Lu Y, Shang Y, Huang X, Chen A, Yang Z, Jiang Y, Cai J, Gu W, Qian X, Yang H, Cheng R. Preparation of Strong Cationic Chitosan-graft-Polyacrylamide Flocculants and Their Flocculating Properties. Ind Eng Chem Res 2011. [DOI: 10.1021/ie2000665] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yaobo Lu
- Key Lab for Mesoscopic Chemistry of MOE, Department of Polymer Science & Technology, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Yabo Shang
- Zhenjiang Water Supply Company, Zhenjiang 212009, People’s Republic of China
| | - Xin Huang
- Key Lab for Mesoscopic Chemistry of MOE, Department of Polymer Science & Technology, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Aimin Chen
- Zhenjiang Water Supply Company, Zhenjiang 212009, People’s Republic of China
| | - Zhen Yang
- Key Lab for Mesoscopic Chemistry of MOE, Department of Polymer Science & Technology, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Yuxiang Jiang
- Zhenjiang Water Supply Company, Zhenjiang 212009, People’s Republic of China
| | - Jun Cai
- Key Lab for Mesoscopic Chemistry of MOE, Department of Polymer Science & Technology, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Wei Gu
- Zhenjiang Water Supply Company, Zhenjiang 212009, People’s Republic of China
| | - Xiaozhi Qian
- Zhenjiang Water Supply Company, Zhenjiang 212009, People’s Republic of China
| | - Hu Yang
- Key Lab for Mesoscopic Chemistry of MOE, Department of Polymer Science & Technology, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Rongshi Cheng
- Key Lab for Mesoscopic Chemistry of MOE, Department of Polymer Science & Technology, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
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18
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Trompette J, Arurault L, Fontorbes S, Massot L. Influence of the anion specificity on the electrochemical corrosion of anodized aluminum substrates. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2009.12.063] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Evaluation of precipitates used in strainer head loss testing. Part I. Chemically generated precipitates. NUCLEAR ENGINEERING AND DESIGN 2009. [DOI: 10.1016/j.nucengdes.2009.09.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Das K, Raha S, Somasundaran P. Effect of polyacrylic acid molecular weight on the floc stability during prolonged settling. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.08.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Liang Z, Wang Y, Zhou Y, Liu H, Wu Z. Variables affecting melanoidins removal from molasses wastewater by coagulation/flocculation. Sep Purif Technol 2009. [DOI: 10.1016/j.seppur.2009.06.011] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Wiśniewska M. Investigation of the Effect of Temperature on the Structure of the Polyacrylic Acid Adsorption Layer at a Controlled Porosity Glass/Polymer Solution Interface. ADSORPT SCI TECHNOL 2008. [DOI: 10.1260/026361708786035387] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- Malgorzata Wiśniewska
- Department of Radiochemistry and Colloids Chemistry, Faculty of Chemistry, University of Maria Curie-Skłodowska, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland
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23
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Sabermahani F, Ali Taher M. Determination of trace amounts of cadmium and copper by atomic absorption spectrometry after simultaneous extraction and preconcentration using a new water-soluble polyacrylic acid/alumina sorbent. Mikrochim Acta 2007. [DOI: 10.1007/s00604-006-0729-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Chen Y, Liu S, Wang G. Flocculation properties and adsorption kinetics of cationic starches in kaolin suspensions. J Appl Polym Sci 2007. [DOI: 10.1002/app.26025] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Yu J, Wang D, Ge X, Yan M, Yang M. Flocculation of kaolin particles by two typical polyelectrolytes: A comparative study on the kinetics and floc structures. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2006.05.040] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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26
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Song MG, Lee JH, Lee YG, Koo JH. Stabilization of gamma alumina slurry for chemical–mechanical polishing of copper. J Colloid Interface Sci 2006; 300:603-11. [PMID: 16730740 DOI: 10.1016/j.jcis.2006.04.046] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2006] [Revised: 04/12/2006] [Accepted: 04/15/2006] [Indexed: 10/24/2022]
Abstract
Stabilization of gamma-alumina suspension for chemical-mechanical polishing (CMP) of copper was investigated. Citric acid and poly(acrylic acid) (PAA) (M(w)=5000) were used as dispersant. The stability of suspension was evaluated from the changes in viscosity, particle size and zeta potential. It appears that metastable gamma-alumina mainly due to its high specific surface area and to the presence of aluminol groups on its surface is progressively transformed to bayerite (beta-Al(OH)(3)) by hydration procedure. Citric acid molecules were adsorbed onto gamma-alumina surface effectively and exhibited the excellent hydration inhibition effect. Although citrate-alumina surface complexes give barrier to the flocculation, the repulsion potential is based mainly on the electrostatic repulsion, thereby steric hindrance caused by the adsorption of these small molecules is very weak. The electrosteric repulsion, which provides more effective dispersion stability than electrostatic repulsion force, can be expected by using polyelectrolyte such as PAA; however, adsorbed layers of PAA onto solid/liquid interface are loosely formed. Therefore, a large amount of PAA was required to inhibit the surface hydration of gamma-alumina suspension, thereby the excess addition of PAA decreased the electrosteric repulsion and re-bridging of the dispersant between particles caused an increase in suspension viscosity. Therefore, synergistic effect can be expected in mixed dispersant system of citric acid and PAA, since small citric acid molecules are adsorbed faster than PAA, inhibiting the progress of surface hydration, and then adsorbed PAA layers exhibit the effective electrosteric repulsion interaction between particles with a small amount compared with PAA alone. It was revealed that the gamma-alumina slurry dispersed by mixed dispersant exhibited the improved removal rate of Cu layer by CMP polishing test.
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Affiliation(s)
- Myung-Geun Song
- Samsung Corning R&D Center, 472 Sin-dong, Youngtong-gu, Suwon-si, Gyeonggi-do 442-732, South Korea.
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Guibal E, Van Vooren M, Dempsey BA, Roussy J. A Review of the Use of Chitosan for the Removal of Particulate and Dissolved Contaminants. SEP SCI TECHNOL 2006. [DOI: 10.1080/01496390600742807] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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McGuire MJ, Addai-Mensah J, Bremmell KE. The effect of polymer structure type, pH and shear on the interfacial chemistry, rheology and dewaterability of model iron oxide dispersions. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.09.034] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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29
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Roussy J, Van Vooren M, Dempsey BA, Guibal E. Influence of chitosan characteristics on the coagulation and the flocculation of bentonite suspensions. WATER RESEARCH 2005; 39:3247-58. [PMID: 16019052 DOI: 10.1016/j.watres.2005.05.039] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2004] [Revised: 05/26/2005] [Accepted: 05/31/2005] [Indexed: 05/03/2023]
Abstract
Ten chitosan preparations with different molecular weights (MW) and degrees of deacetylation (DD) were tested for coagulation of 5 g L(-1) bentonite suspensions at pH 5 and 7 in demineralized water (DW) and in tap water (TW). Coagulation was better in TW than in DW for every condition and lower doses of chitosan were required at pH 5 than at pH 7. More than 95% of residual turbidity (after sedimentation in the absence of chitosan) was removed using less than 0.10 mg L(-1) chitosan in either TW or DW at pH 5 or in TW at pH 7. Higher doses were required for removal of turbidity in DW at pH 7, but in all cases the effective concentrations of chitosan were much lower than required for complete neutralization of the negative charge on the bentonite particles. Removal of turbidity was best for the higher MW chitosans in either the B series (89.5% DD) or the C series (95% DD) of chitosans. Overall, the results were consistent with destabilization of bentonite by the combined mechanisms of electrostatic patch and bridging. The improved performance of chitosan in TW could have been due to improved attachment to bentonite due to the presence of sulfate and other counter-ions in TW.
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Affiliation(s)
- Jean Roussy
- Ecole des Mines d'Alès, Laboratoire Génie de l'Environnement Industriel, 6, avenue de Clavières, F-30319 ALES cedex, France
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