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Publications (10 of 17) Show all publications
Barai, M., Mandal, M. K., Karak, A., Bordes, R., Patra, A., Dalai, S. & Panda, A. K. (2019). Interfacial and Aggregation Behavior of Dicarboxylic Amino Acid-Based Surfactants in Combination with a Cationic Surfactant. Langmuir, 35(47), 15306-15314
Open this publication in new window or tab >>Interfacial and Aggregation Behavior of Dicarboxylic Amino Acid-Based Surfactants in Combination with a Cationic Surfactant
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2019 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 35, no 47, p. 15306-15314Article in journal (Refereed) Published
Abstract [en]

The interfacial and micellization behavior of three dicarboxylic amino acid-based anionic surfactants, abbreviated as AAS (N-dodecyl derivative of -aminomalonate, -aspartate, and -glutamate) in combination with hexadecyltrimethylammonium bromide (HTAB) were investigated by surface tension, conductance, UV–vis absorption/emission spectroscopy, dynamic light scattering (DLS), and viscosity studies. Critical micelle concentration (CMC) values of the surfactant mixtures are significantly lower than the predicted values, indicating associative interaction between the components. Surface excess, limiting molecular area, surface pressure at the CMC, and Gibbs free energy indicate spontaneity of the micellization processes compared to the pure components. CMC values were also determined from the sigmoidal variation in the plot of micellar polarity and pyrene UV–vis absorption/emission intensities with surfactant concentration. The aggregation number, determined by static fluorescence quenching method, increases with decreasing mole fraction of the AAS (αAAS), where the micelles are mainly dominated by the HTAB molecules. The size of the micelle increases with decreasing αAAS, leading to the formation of larger and complex aggregates, as also supported by the viscosity studies. Micelles comprising 20–40 mol % AAS are highly viscous, in consonance with their sizes. Some of the mixed surfactant systems show unusual viscosity (shear thickening and increased viscosity with increasing temperature). Such mixed surfactant systems are considered to have potential in gel-based drug delivery and nanoparticle synthesis.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-76804 (URN)10.1021/acs.langmuir.9b02895 (DOI)000500039900036 ()31689362 (PubMedID)2-s2.0-85075700091 (Scopus ID)
Funder
Swedish Research Council Formas, 157142
Note

Validerad;2019;Nivå 2;2019-12-03 (johcin)

Available from: 2019-11-21 Created: 2019-11-21 Last updated: 2019-12-20Bibliographically approved
Patra, A., Taner, H. A., Bordes, R., Holmberg, K. & Larsson, A.-C. (2019). Selective flotation of calcium minerals using double-headed collectors. Journal of Dispersion Science and Technology, 40(8), 1205-1216
Open this publication in new window or tab >>Selective flotation of calcium minerals using double-headed collectors
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2019 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 40, no 8, p. 1205-1216Article in journal (Refereed) Published
Abstract [en]

A study was performed involving a series of double-headed carboxylate collectors with varying distance between the head groups (one, two or three carbon atoms). A collector with the same alkyl chain length but with only one carboxylate group was also included. All these were amino-acid based amphiphiles and the polar head group was connected to the hydrophobic tail via an amide linkage. Selective flotation recovery of different calcium minerals using these collectors was investigated. The double-headed collector with one carbon atom between the carboxylate groups was an apatite and fluorite specific reagent while the monocarboxylate surfactant showed high specificity for calcite. The flotation behavior of a simple conventional collector of the same alkyl chain length, a fatty acid salt, was also determined under identical flotation conditions in order to understand the effect of the amide group. Complementary experiments (ζ potential measurements, adsorption isotherm determinations) were also performed for these reagents. In order to shed light on the selectivity obtained with the dicarboxylate surfactants, the distances between the head groups were calculated and compared with the distances between neighboring calcium atoms on the surface of the minerals. It was found that the high degree of selectivity could be rationalized by perfect matching of these distances. To the best of our knowledge this is the first study where flotation selectivity in complex calcium mineral systems has been explained in terms of molecular recognition governing the interaction between the collector and the mineral surface.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Biodegradable surfactants, calcium minerals, double-headed collector, mineral specific flotation, multilayer adsorption
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-71355 (URN)10.1080/01932691.2018.1503547 (DOI)000474496900014 ()2-s2.0-85054840444 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-07-08 (johcin)

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2019-12-06Bibliographically approved
Karlkvist, T., Patra, A., Bordes, R., Holmberg, K. & Rao, H. (2016). Flotation selectivity of novel alkyl dicarboxylate reagents for calcite-fluorite separation (ed.). Tenside Surfactants Detergents, 53(6), 516-523
Open this publication in new window or tab >>Flotation selectivity of novel alkyl dicarboxylate reagents for calcite-fluorite separation
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2016 (English)In: Tenside Surfactants Detergents, ISSN 0932-3414, E-ISSN 2195-8564, Vol. 53, no 6, p. 516-523Article in journal (Refereed) Published
Abstract [en]

A series of amino acid-based surfactants with a fixed alkyl chain length and with two carboxyl groups separated by a spacer of one, two or three carbon atoms have been synthesized and evaluated as potential collectors for flotation of calcite and fluorite. A monocarboxylate amino acid-based surfactant having the same length of the hydrocarbon tail was also included in the study. Experiments using a Hallimond flotation tube showed that although the flotation reagents solely differs in terms of spacer, their efficacy in terms of flotation recovery varied very much. Whereas on calcite at pH 10.5 only the monocarboxylate collector gave a high yield, on fluorite at the same pH both the monocarboxylate and the dicarboxylate collectors with one carbon between the carboxyl groups gave good results. On calcite at the natural pH the monocarboxylate collector was most efficient but the dicarboxylate collectors with a two- and a three-carbon spacer also gave a reasonable recovery. On fluorite at the natural pH the dicarboxylate collectors with a two- and a three-carbon spacer were most efficient. The potential and the flotation recovery of the mineral particles as afunction of added collector was assessed and the adsorption was also monitored by diffuse reflectance infra-red spectroscopy. Taken together, the results showed that small changes in the head group region of the collector can radically affect flotation recovery. This type of knowledge is important to understand flotation selectivity in a mixture of similar minerals.

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing; Future mining (AERI)
Identifiers
urn:nbn:se:ltu:diva-7761 (URN)10.3139/113.110471 (DOI)000388868300001 ()2-s2.0-84997683955 (Scopus ID)62cb80ee-2701-4146-bbac-57a22fff99fa (Local ID)62cb80ee-2701-4146-bbac-57a22fff99fa (Archive number)62cb80ee-2701-4146-bbac-57a22fff99fa (OAI)
Note

Validerad; 2017; Nivå 2; 2016-12-19 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Karlkvist, T., Patra, A., Kota, H. R., Bordes, R. & Holmberg, K. (2015). Flotation selectivity of novel alkyl dicarboxylate reagents for apatite-calcite separation (ed.). Journal of Colloid and Interface Science, 445, 40-47
Open this publication in new window or tab >>Flotation selectivity of novel alkyl dicarboxylate reagents for apatite-calcite separation
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2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 445, p. 40-47Article in journal (Refereed) Published
Abstract [en]

The investigation aims to demonstrate the conceptual thoughts behind developing mineral specific reagents for use in flotation of calcium containing ores. For this purpose, a series of dicarboxylate-based surfactants with varying distance between the carboxylate groups (one, two or three methylene groups) was synthesized. A surfactant with the same alkyl chain length but with only one carboxylate group was also synthesized and evaluated. The adsorption behavior of these new reagents on pure apatite and pure calcite surfaces was studied using Hallimond tube flotation, FTIR and ζ potential measurements. The relation between the adsorption behavior of a given surfactant at a specific mineral surface and its molecular structure over a range of concentrations and pH values, as well as the region of maximum recovery, was established. It was found that one of the reagents, with a specific distance between the carboxylate groups, was much more selective for a particular mineral surface than the other homologues. For example, out of the four compounds synthesized, only the one where the carboxylate groups were separated by a single methylene group floated apatite but not calcite, whereas calcite was efficiently floated with the monocarboxylic reagent, but not with the other reagents synthesized. This selective adsorption of a given surfactant to a particular mineral surface relative to other mineral surfaces as evidenced in the flotation studies was substantiated by ζ potential and infra-red spectroscopy data

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-10025 (URN)10.1016/j.jcis.2014.11.072 (DOI)000350006700006 ()25596367 (PubMedID)2-s2.0-84921051820 (Scopus ID)8c78bb41-0a29-4bee-b260-10091965f006 (Local ID)8c78bb41-0a29-4bee-b260-10091965f006 (Archive number)8c78bb41-0a29-4bee-b260-10091965f006 (OAI)
Note

Validerad; 2015; Nivå 2; 20141205 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Patra, A., Karlkvist, T., Rao, H., Fredriksson, A., Bordes, R. & Holmberg, K. (2014). Design and development of novel mineral-specific collectors for flotation (ed.). Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014. Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014.
Open this publication in new window or tab >>Design and development of novel mineral-specific collectors for flotation
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2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Almost all of the flotation reagents used today were discovered by continued application of empirical methods and/or trial and error experimentation. Moreover, with the metal-ion specific approach used so far, it is difficult to separate the minerals containing the same constituent metal ion. A critical assessment of molecular recognition processes involved in biomineralization suggested the possibility of using reagents which are surface specific. The concept that the molecules consisting of two or more functional groups having appropriate spacing between those so as to achieve structural/stereochemical compatibility during interaction with the mineral surface exhibit structure-specificity is thought to be extended to the design of specific collectors in flotation processes. In the present study, for the first time, a rational design of surface active molecules, and thereby the recognition of crystal faces (of minerals) by these molecules through structural and stereochemical matching is being utilized successfully to selectively float various minerals. For this purpose, carboxylate-based collectors (for mineral specific flotation of calcium minerals) as well as xanthate-based collectors (for mineral specific flotation of sulphide minerals) with a fixed alkyl chain length but having two functional groups with varying geometrical distances (separated by a spacer of one, two and three carbon atoms) between them have been synthesized. In this article, we have discussed the design, synthesis, purification of these novel mineral specific collectors as well as their important solution parameters in relation to flotation processes.

National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-32389 (URN)6e1ec01b-f440-4b68-834f-f21ec913fd43 (Local ID)6e1ec01b-f440-4b68-834f-f21ec913fd43 (Archive number)6e1ec01b-f440-4b68-834f-f21ec913fd43 (OAI)
Conference
International Mineral Processing Congress : 20/10/2014 - 24/10/2014
Note
Godkänd; 2014; 20150824 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Patra, A. (2014). Development of Novel Reagents for Mineral-Specific Flotation (ed.). Paper presented at Conference in Minerals Engineering 2014 : 04/02/2014 - 05/02/2014. Paper presented at Conference in Minerals Engineering 2014 : 04/02/2014 - 05/02/2014.
Open this publication in new window or tab >>Development of Novel Reagents for Mineral-Specific Flotation
2014 (English)Conference paper, Oral presentation only (Refereed)
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-29389 (URN)2dbed248-4678-4836-8cfc-bfd0ceae0d22 (Local ID)2dbed248-4678-4836-8cfc-bfd0ceae0d22 (Archive number)2dbed248-4678-4836-8cfc-bfd0ceae0d22 (OAI)
Conference
Conference in Minerals Engineering 2014 : 04/02/2014 - 05/02/2014
Note
Godkänd; 2014; 20140515 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Karlkvist, T., Patra, A., Rao, H., Bordes, R., Holmberg, K. & Fredriksson, A. (2014). Molecular recognition in mineral flotation: Selectivity in apatite-calcite system (ed.). Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014. Paper presented at International Mineral Processing Congress : 20/10/2014 - 24/10/2014.
Open this publication in new window or tab >>Molecular recognition in mineral flotation: Selectivity in apatite-calcite system
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2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The present investigation aims to develop and distinguish mineral specific reagents with two functional groups for use in flotation of calcium containing minerals. For this purpose, a series of dicarboxylate-based surfactants with varying length between the carboxylate groups (one, two or three methylene groups) were synthesized. As reference, a surfactant with the same alkyl chain length but with only one carboxylate group in the polar part was synthesized. The adsorption behavior of these new reagents on pure apatite and calcite mineral surfaces was studied using Hallimond tube flotation, FTIR and ζ potential measurements. The relation between the adsorption behavior of a given surfactant on a specific mineral surface and its molecular structure over a range of concentration and pH values, as well as the region of maximum recovery were established. It was found that one of the reagents, with a specific distance between the carboxylate groups, was much more selective for a particular mineral surface than the other homologues synthesized. This selective adsorption of a given surfactant to a particular mineral surface relative to other mineral surfaces as evidenced in flotation studies is substantiated by ζ potential and infra-red spectroscopy data.

National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-34992 (URN)84938844701 (Scopus ID)9556eee6-e2b7-4c8d-81e9-ae4ad6be9cbc (Local ID)9556eee6-e2b7-4c8d-81e9-ae4ad6be9cbc (Archive number)9556eee6-e2b7-4c8d-81e9-ae4ad6be9cbc (OAI)
Conference
International Mineral Processing Congress : 20/10/2014 - 24/10/2014
Note
Godkänd; 2014; 20150824 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Karlkvist, T., Patra, A., Kota, H. R., Bordes, R. & Holmberg, K. (2013). Molecular recognition mechanisms in biomineralization applied to reagents selectivity in froth flotation (ed.). Paper presented at Conference in Minerals Engineering 2013 : 05/02/2013 - 06/02/2013. Paper presented at Conference in Minerals Engineering 2013 : 05/02/2013 - 06/02/2013.
Open this publication in new window or tab >>Molecular recognition mechanisms in biomineralization applied to reagents selectivity in froth flotation
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2013 (English)Conference paper, Oral presentation only (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-29695 (URN)33ec4bfd-20f6-4de8-a7ae-cac740958f0e (Local ID)33ec4bfd-20f6-4de8-a7ae-cac740958f0e (Archive number)33ec4bfd-20f6-4de8-a7ae-cac740958f0e (OAI)
Conference
Conference in Minerals Engineering 2013 : 05/02/2013 - 06/02/2013
Note
Godkänd; 2013; 20140204 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Kota, H. R., Javadi, A., Karlkvist, T., Patra, A., Vilinska, A. & Chernyshova, I. (2013). Revisiting sulphide mineral (bio) processing: a few priorities and directions (ed.). Paper presented at . Powder Metallurgy & Mining, 2(4)
Open this publication in new window or tab >>Revisiting sulphide mineral (bio) processing: a few priorities and directions
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2013 (English)In: Powder Metallurgy & Mining, ISSN 2168-9806, Vol. 2, no 4Article in journal (Refereed) Published
Abstract [en]

Large efforts are being made to streamline the conventional (chemical and physical) technological schemes of ore processing, remediation and environmental protection towards reducing overall costs, limiting the use of dangerous substances, decreasing waste streams and improving waste disposal and recycling practice. Hitherto, search for such innovations has been performed mainly empirically and there is an urgent need to shift these technologies to be more innovative and effective. Alternative biotechnological solutions and solutions mimicking natural processes are also being proposed. However, except for bioleaching, practical exploitation of the biotechnological potential in extractive industries and accompanying environmental protection measures remains far from feasibility. Understanding of the fundamental concepts of aquatic chemistry of minerals–selective adsorption and selective redox reactions at mineral– bacteria–solution interfaces, impact innovating conventional and bio-flotation, as well as (bio) remediation/detoxification of mineral and chemical wastes are necessary. Molecular-level knowledge and coherent understanding of minerals contacted with aqueous solutions is required that underlie great opportunities in controlling abiotic and biotic mineral– solution interfaces towards the grand challenge of tomorrow’s science and mineral processing technology

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-2956 (URN)10.4172/2168-9806.1000116 (DOI)0b41645e-60f2-451b-acd6-4ab8337c5ac5 (Local ID)0b41645e-60f2-451b-acd6-4ab8337c5ac5 (Archive number)0b41645e-60f2-451b-acd6-4ab8337c5ac5 (OAI)
Note
Godkänd; 2013; 20131201 (alijav)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-04-16Bibliographically approved
Kota, H. R., Javadi, A., Karlkvist, T., Patra, A., Vilinska, A. & Chernyshova, I. (2013). Revisiting sulphide mineral (bio) processing: a few priorities and directions (ed.). In: (Ed.), (Ed.), XV Balkan Mineral Processing Congress, 12-16 June 2013, Sozopol, Bulgaria: . Paper presented at Balkan Mineral Processing Congress : 12/06/2013 - 16/06/2013.
Open this publication in new window or tab >>Revisiting sulphide mineral (bio) processing: a few priorities and directions
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2013 (English)In: XV Balkan Mineral Processing Congress, 12-16 June 2013, Sozopol, Bulgaria, 2013Conference paper, Published paper (Refereed)
Abstract [en]

Large efforts are being made to streamline the conventional (chemical and physical) technological schemes of ore processing, remediation and environmental protection towards reducing overall costs, limiting the use of dangerous substances, decreasing waste streams and improving waste disposal and recycling practice. Hitherto, search for such innovations has been performed mainly empirically and there is an urgent need to shift these technologies to be more innovative and effective. Alternative biotechnological solutions and solutions mimicking natural processes are also being proposed. However, except for bioleaching, practical exploitation of the biotechnological potential in extractive industries and accompanying environmental protection measures remains far from feasibility.Understanding of the fundamental concepts of aquatic chemistry of minerals–selective adsorption and selective redox reactions at mineral–bacteria–solution interfaces, impact innovating conventional and bio-flotation, as well as (bio)remediation/detoxification of mineral and chemical wastes. Molecular-level knowledge and coherent understanding of minerals contacted with aqueous solutions is required that underlie great opportunities in controlling abiotic and biotic mineral–solution interfaces towards the grand challenge of tomorrow’s science and mineral processing technology.

National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-38829 (URN)d57dc772-52fd-466d-8abe-2ffb9062da4c (Local ID)d57dc772-52fd-466d-8abe-2ffb9062da4c (Archive number)d57dc772-52fd-466d-8abe-2ffb9062da4c (OAI)
Conference
Balkan Mineral Processing Congress : 12/06/2013 - 16/06/2013
Note
Godkänd; 2013; 20130412 (alijav)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-04-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9153-6262

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