Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 14) Show all publications
Wei, J., Geng, S., Sarmad, S., Hedlund, J. & Oksman, K. (2018). Adsorption of Carbon Dioxide on Cellulose Nanofiber-Based Monolithic Cryogels Impregnated with Acetylated Cellulose Nanocrystals. In: : . Paper presented at 72nd Forest Products Society (FPS) International Convention, Madison, Wisconsin, USA, June 11–14, 2018.
Open this publication in new window or tab >>Adsorption of Carbon Dioxide on Cellulose Nanofiber-Based Monolithic Cryogels Impregnated with Acetylated Cellulose Nanocrystals
Show others...
2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Nanocellulose materials with large surface area are prospective as substrates to obtain low-carbon-footprint CO2 adsorbents. In this study, ice-templating was conducted to prepare cellulose nanofibers (CNFs) based cryogels with monolithic structure, which can provide a good mass flow during the adsorption process. Furthermore, since acetyl groups have shown relatively high CO2 affinity, cellulose nanocrystals (CNCs) were acetylated and then impregnated into the cryogel to improve its CO2 capacity. Meanwhile, different amounts of cellulose acetate (CA) were impregnated and characterized as references. The success of the acetylation of CNCs was confirmed by Fourier-transform infrared spectroscopy (FTIR) and the degree of substitution was determined by titration. Results from the scanning electron microscopy (SEM) demonstrated that the monolithic structure was maintained after the impregnation. According to the breakthrough test, the cryogel impregnated with 0.1g of acetylated CNCs exhibits a much higher CO2 capacity with a value of 1.49 mmol/g compared to the CA impregnated ones. The mechanical properties of the cryogels were also evaluated by compression testing, revealing the outstanding reinforcing effect of acetylated CNCs.

Keywords
Nanocellulose, cryogel, adsorption, carbon dioxide, acetylation
National Category
Chemical Process Engineering Bio Materials
Research subject
Wood and Bionanocomposites; Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-71083 (URN)
Conference
72nd Forest Products Society (FPS) International Convention, Madison, Wisconsin, USA, June 11–14, 2018
Available from: 2018-10-02 Created: 2018-10-02 Last updated: 2019-01-16Bibliographically approved
Sarmad, S., Mikkola, J.-P. & Ji, X. (2017). Carbon Dioxide Capture with Ionic Liquids and Deep Eutectic Solvents: A New Generation of Sorbents. ChemSusChem, 10(2), 324-352
Open this publication in new window or tab >>Carbon Dioxide Capture with Ionic Liquids and Deep Eutectic Solvents: A New Generation of Sorbents
2017 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, no 2, p. 324-352Article, review/survey (Refereed) Published
Abstract [en]

High cost and high energy penalty for carbon dioxide (CO2) uptake from flue gases are important obstacles in large-scale industrial applications, and developing efficient technology for CO2 capture from technic and economic points is crucial. Ionic liquids (ILs) show the potential for CO2 separation due to their inherent advantages and have been proposed as alternatives in order to overcome the drawbacks of conventional sorbents. Chemical modification of ILs to improve their performance in CO2 absorption has received more attention. Deep eutectic solvents (DESs) as a new generation of ILs are considered as more economical alternatives to cope with the deficiencies of high cost and high viscosity of conventional ILs. This review discusses the potential of the functionalized ILs and DESs as CO2 sorbents. Incorporation of CO2-philic functional groups like amine in cation and/or anion moiety of ILs can be promoted their absorption capacity. In general, the functionalization of anion part of ILs is more effective than cation part. DESs represent favourable solvent properties and are capable of capturing CO2, but the research work is scarce and undeveloped compared to the studies conducted on ILs. It is possible to develop novel DESs with promising absorption capacity. However, more investigation needs to be carried out on the mechanism of CO2 sorption of DESs to clarify how these novel sorbents can be adjusted and fine-tuned to best tailored as optimized media for CO2 capture.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-60742 (URN)10.1002/cssc.201600987 (DOI)000394571900003 ()27906508 (PubMedID)2-s2.0-85007452582 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-01-23 (rokbeg)

Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2018-09-14Bibliographically approved
Sarmad, S., Xie, Y., Mikkola, J.-P. & Ji, X. (2017). Screening of Deep Eutectic Solvents (DESs) as green CO2 sorbents: from solubility to viscosity. New Journal of Chemistry, 41(1), 290-301
Open this publication in new window or tab >>Screening of Deep Eutectic Solvents (DESs) as green CO2 sorbents: from solubility to viscosity
2017 (English)In: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 41, no 1, p. 290-301Article in journal (Refereed) Published
Abstract [en]

Deep eutectic solvents (DESs) as ionic liquid (IL) analogues show great potential for CO2 capture. They exhibit favorable solvent properties and are considered to be economical alternatives to conventional ILs. In this study, we prepare 35 DESs and screen them in terms of their CO2 solubility and viscosity, both crucial factors to be considered when designing efficient CO2 sorbents. The influence of salt and HBD type and structure, as well their molar ratio on the CO2 solubility and viscosity of the DESs is investigated. The viscosity and CO2 solubility of the DESs are compared with those of other DESs and conventional ILs. 15 DESs, which exhibit comparable CO2 absorption capacity to choline chloride-urea DESs, glycerol DESs and fluorinated ILs, are chosen as the promising ones. The viscosities of the selected DESs are below 200 mPa s and are lower than those of choline chloride-based DESs. Since the viscosity of the DESs is relatively high, on a par with those of conventional ILs, the effect of water as a co-solvent is investigated in order to decrease the viscosity. The addition of water to the glycerol-based DESs improves the kinetics of absorption by decreasing the viscosity, thus increasing the CO2 absorption capacity. Dry or aqueous DESs that demonstrate a high sorption capacity and low viscosity are chosen for additional analysis and characterization, and further functionalization will be carried out in the future to improve their sorption capacityy

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-60743 (URN)10.1039/c6nj03140d (DOI)000391451500034 ()2-s2.0-85007164346 (Scopus ID)
Note

Validerad; 2017; Nivå 2; 2017-01-13 (andbra)

Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2018-11-16Bibliographically approved
Bekin, S., Sarmad, S., Gürkan, K., Yenici, G., Keceli, G. & Gürdag, G. (2014). Dielectric, thermal, and swelling properties of calcium ion crosslinked sodium alginate film. Polymer Engineering and Science, 54(6), 1372-1382
Open this publication in new window or tab >>Dielectric, thermal, and swelling properties of calcium ion crosslinked sodium alginate film
Show others...
2014 (English)In: Polymer Engineering and Science, ISSN 0032-3888, E-ISSN 1548-2634, Vol. 54, no 6, p. 1372-1382Article in journal (Refereed) Published
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61893 (URN)10.1002/pen.23678 (DOI)2-s2.0-84900536453 (Scopus ID)
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-03-06Bibliographically approved
Bekin, S., Sarmad, S., Gürkan, K., Keçeli, G. & Gürdağ, G. (2014). Synthesis, characterization and bending behavior of electroresponsive sodium alginate / poly (acrylic acid) interpenetrating network films in an electric stimulus. Sensors and actuators. B, Chemical, 202, 878-892
Open this publication in new window or tab >>Synthesis, characterization and bending behavior of electroresponsive sodium alginate / poly (acrylic acid) interpenetrating network films in an electric stimulus
Show others...
2014 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 202, p. 878-892Article in journal (Refereed) Published
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61892 (URN)10.1016/j.snb.2014.06.051 (DOI)2-s2.0-84903976032 (Scopus ID)
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-03-06Bibliographically approved
Gürdağ, G. & Sarmad, S. (2013). Cellulose Graft Copolymers: Synthesis, Properties, and Applications. In: Susheel Kalia and M.W. Sabaa (Ed.), Polysaccharide based Graft Copolymers: (pp. 15-57). Berlin: Springer
Open this publication in new window or tab >>Cellulose Graft Copolymers: Synthesis, Properties, and Applications
2013 (English)In: Polysaccharide based Graft Copolymers / [ed] Susheel Kalia and M.W. Sabaa, Berlin: Springer, 2013, p. 15-57Chapter in book (Refereed)
Abstract [en]

Grafting of vinyl monomers onto cellulose is an important tool for the modification of cellulose. Depending on the monomer grafted onto cellulose, it gains new properties. The grafting can be performed in heterogeneous or homogeneous medium. In the grafting performed in heterogeneous medium, the reaction is carried out in aqueous medium using a suitable initiator. As initiator, the radiation or chemical initiators such as ceric ammonium nitrate (CAN), various persulfates, azobisisobutyronitrile (AIBN), and Fenton reagent (Fe(II)–H2O2) are mostly used. In case of CAN initiator, the grafting should be performed in acidic medium in order to prevent its hydrolysis. In the homogeneous grafting reactions, either a water-soluble cellulose derivative is used in the grafting or cellulose is dissolved in a suitable solvent, and then the grafting is performed. Higher number of grafts per cellulose chain is obtained in homogeneous grafting than those in heterogeneous medium

Place, publisher, year, edition, pages
Berlin: Springer, 2013
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61908 (URN)10.1007/978-3-642-36566-9_2 (DOI)2-s2.0-84927682456 (Scopus ID)978-3-642-36565-2 (ISBN)978-3-642-36566-9 (ISBN)
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-03-06Bibliographically approved
Sarmad, S., Yenici, G., Gürkan, K., Keçeli, G. & Gürdağ, G. (2013). Electric field responsive chitosan–poly(N,N-dimethyl acrylamide) semi-IPN gel films and their dielectric, thermal and swelling characterization. Smart materials and structures (Print), 22(5), Article ID 055010.
Open this publication in new window or tab >>Electric field responsive chitosan–poly(N,N-dimethyl acrylamide) semi-IPN gel films and their dielectric, thermal and swelling characterization
Show others...
2013 (English)In: Smart materials and structures (Print), ISSN 0964-1726, E-ISSN 1361-665X, Vol. 22, no 5, article id 055010Article in journal (Refereed) Published
Abstract [en]

The electroresponsive, dielectric and swelling behavior of semi-interpenetrated polymer network (semi-IPN) gel films prepared from chitosan (CS) and N,N-dimethyl acrylamide (DA) were investigated and compared with those CS film. CS–DA semi-IPN films were also characterized by Fourier transform infrared, x-ray diffraction and differential scanning calorimetry measurements. The electrosensitivity of CS–DA films to an electric field was investigated by determining their bending at 8 V in (0.05 M/0.1 M/0.15 M) NaCl solution. Equilibrium swelling values of CS–DA films both in distilled water and buffer solution with pH = 2.2 decreased with poly-DA (PDA) content of the films. While the maximum decomposition of CS film took place at about 296 °C, the presence of PDA in CS–DA semi-IPN films reduced the thermal stability, and their maximum decomposition temperature shifted from 261 to 240 °C with the increase in PDA content. In addition, the PDA network led to a decrease in the dielectric constant (ε'), dielectric loss (ε'') and conductance (σ) of CS–DA semi-IPN films in the frequency range between 12 Hz and 100 kHz. The values of electric modulus and impedance, and Cole–Cole plots confirmed that the conductance values of CS–DA films are lower than that of CS film. The PDA network also led CS–DA films to respond more slowly to electric field. The increase in NaCl concentration in the bending medium increased the response rate of CS–DA films to an electric field. The final bending angle of all CS–DA films was 90°, and it was not dependent on either NaCl concentration or PDA content of the films.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2013
National Category
Engineering and Technology Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61480 (URN)10.1088/0964-1726/22/5/055010 (DOI)000317962300011 ()2-s2.0-84876927455 (Scopus ID)
Available from: 2017-01-17 Created: 2017-01-17 Last updated: 2018-11-23Bibliographically approved
Zafarani-Moattar, M. T. & Sarmad, S. (2012). Apparent molar volumes, apparent isentropic compressibilities, and viscosity B-coefficients of 1-ethyl-3-  methylimidazolium bromide in aqueous di-potassium hydrogen phosphate and potassium di-hydrogen phosphate solutions at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K. Journal of Chemical Thermodynamics, 54, 192-203
Open this publication in new window or tab >>Apparent molar volumes, apparent isentropic compressibilities, and viscosity B-coefficients of 1-ethyl-3-  methylimidazolium bromide in aqueous di-potassium hydrogen phosphate and potassium di-hydrogen phosphate solutions at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K
2012 (English)In: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 54, p. 192-203Article in journal (Refereed) Published
Abstract [en]

Apparent molar volumes Vϕ, apparent isentropic compressibilities κϕ, and viscosity B-coefficients for 1-ethyl-3-methylimidazolium bromide (EmimBr) in aqueous di-potassium hydrogen phosphate (K2HPO4) solutions with salt weight fractions (ws = 0.00, 0.10, 0.15, and 0.20) and potassium di-hydrogen phosphate (KH2PO4) solutions with salt weight fractions (ws = 0.00, 0.04, 0.07, and 0.10) have been determined from solution density, sound velocity and viscosity measurements at temperatures over the range (298.15 to 318.15) K as function of concentration of 1-ethyl-3-methylimidazolium bromide (EmimBr). In the investigated temperature range, the relation: Vϕ0=a0+a1T+a2T2, has been used to describe the temperature dependence of the standard partial molar volumes Vϕ0. These results have, in conjunction with the results obtained in pure water, been used to deduce the standard volumes of transfer ΔVϕ0 and viscosity B-coefficients of transfer for 1-ethyl-3-methylimidazolium bromide from water to aqueous K2HPO4 and KH2PO4 solutions for rationalizing various interactions in the ternary solutions. The structure making or breaking ability of 1-ethyl-3-methylimidazolium bromide has been discussed in terms of the sign of ∂2Vϕ0∂T2. An increase in the transfer volume of 1-ethyl-3-methylimidazolium bromide with increasing phosphate salts concentration has been explained by Friedman–Krishnan co-sphere model. The activation parameters of viscous flow for the ternary solutions investigated were also determined and discussed by the application of transition state theory.

Place, publisher, year, edition, pages
Elsevier, 2012
National Category
Engineering and Technology Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61898 (URN)10.1016/j.jct.2012.03.032 (DOI)2-s2.0-84863719186 (Scopus ID)
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-03-06Bibliographically approved
Zafarani-Moattar, M. T. & Sarmad, S. (2011). Osmotic and activity coefficient of 1-ethyl-3-methylimidazolium chloride in aqueous solutions of tri-potassium phosphate, potassium carbonate, and potassium chloride at T=298.15 K. Calphad, 35(3), 331-341
Open this publication in new window or tab >>Osmotic and activity coefficient of 1-ethyl-3-methylimidazolium chloride in aqueous solutions of tri-potassium phosphate, potassium carbonate, and potassium chloride at T=298.15 K
2011 (English)In: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 35, no 3, p. 331-341Article in journal (Refereed) Published
Abstract [en]

Vapour–liquid equilibrium data (water activity, vapour pressure, osmotic coefficient, and activity coefficient) of the mixed electrolyte aqueous solutions, 1-ethyl-3-methylimidazolium chloride, (EmimCl) + tri-potassium phosphate, EmimCl + potassium carbonate, EmimCl + potassium chloride and their corresponding binary aqueous solutions have been measured by the isopiestic method at a temperature of 298.15 K. The osmotic coefficients for binary aqueous solutions were correlated to the Pitzer, modified Pitzer and TCPC models. The osmotic coefficient of mixed electrolyte with common anion was correlated to the Pitzer model. From these data, the corresponding mean activity coefficients, γ±">γ± , have been calculated. The activity coefficients of mixed electrolytes were calculated by Scatchard’s neutral electrolyte method. A modified Pitzer model has been used to predict the osmotic and activity coefficients of mixed electrolyte solution with common anion.

Place, publisher, year, edition, pages
Elsevier, 2011
National Category
Engineering and Technology Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61899 (URN)10.1016/j.calphad.2011.04.008 (DOI)2-s2.0-79957505880 (Scopus ID)
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-03-06Bibliographically approved
Zafarani-Moattar, M. T. & Sarmad, S. (2010). Effect of tri-potassium phosphate on volumetric, acoustic, and transport behaviour of aqueous solutions of 1-ethyl-3-methylimidazolium bromide at T = (298.15 to 318.15) K. Journal of Chemical Thermodynamics, 42(10), 1213-1221
Open this publication in new window or tab >>Effect of tri-potassium phosphate on volumetric, acoustic, and transport behaviour of aqueous solutions of 1-ethyl-3-methylimidazolium bromide at T = (298.15 to 318.15) K
2010 (English)In: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 42, no 10, p. 1213-1221Article in journal (Refereed) Published
Abstract [en]

Density, sound velocity, and viscosity of 1-ethyl-3-methylimidazolium bromide, [Emim][Br], in aqueous solutions of tri-potassium phosphate with salt weight fractions (ws = 0.00, 0.10, 0.15, and 0.20) have been measured as a function of concentration of [Emim][Br] at atmospheric pressure and T = (298.15, 303.15, 308.15, 313.15, and 318.15) K. The apparent molar volume, isentropic compressibility, apparent isentropic compressibility, and relative viscosity values have been evaluated from the experimental data. The partial molar volume and isentropic compressibility at infinite dilution, and viscosity B-coefficient obtained from these data have been used to calculate the corresponding transfer parameters for the studied IL from water to the aqueous tri-potassium phosphate solutions. Also, an empirical equation was satisfactorily used to correlate the experimental viscosity data.

Place, publisher, year, edition, pages
Elsevier, 2010
National Category
Engineering and Technology Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-61901 (URN)10.1016/j.jct.2010.04.025 (DOI)2-s2.0-77953870241 (Scopus ID)
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2018-03-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6516-1230

Search in DiVA

Show all publications