Study of pore structure in grafted polymer membranes using slow positron beam and small-angle X-ray scattering techniques

Pujari, P. K.; Sen, Debasis; Amarendra, G.; Abhaya, S.; Pandey, Ashok K.; Dutta, Dimple P.; Mazumder, S.

doi:10.1016/j.nimb.2006.11.052

Cited by 35 publications

(25 citation statements)

References 11 publications

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“…The pore size distribution (PSD) f(r) based on the SAXS data was calculated using an integral equation for the scattering intensity I(q) (Pujari et al 2007)…”

Section: Characterization Methodsmentioning

confidence: 99%

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

et al. 2018

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Nanoporous microspheres with divinylbenzene (DVB), styrene (St), and lignin were synthesized by an emulsion-suspension polymerization method. Several types of lignins were used: (1) kraft lignin before (L-unmod) and after modification with methacryloyl chloride (L-Met) and (2) low-molecularweight kraft lignin unmodified (LWL-unmod) and modified with methacrylic anhydride (LWL-Met). LWL was prepared by ultrafiltration of industrial black liquor using a ceramic membrane with a molecular weight (Mw) cut-off of 5 kDa. The synthesis was optimized by addition of different amounts of lignins. The microsphere texture was characterized using low-temperature nitrogen adsorption and small angle X-ray scattering analyses. The microspheres were nano-and mesoporous with a specific surface area in the range of 0.1-409 m 2 /g. The morphology of the copolymers was studied using field emission scanning electron microscopy and atomic force microscopy. The thermal properties were studied using differential scanning calorimetry and thermogravimetric analysis methods. A significant difference in the microsphere roughness is affected by lignins due to the presence of lignin nanoparticles at the surface of the microspheres. Molecular modeling was used to predict the sorption properties of the copolymers affected by various fields around the particles. The particle size, polydispersity and zeta potential of the St ? DVB, L-Met ? St ? DVB and L-unmod ? St ? DVB samples were measured by dynamic light scattering. Additionally, the point of zero charge of the samples was determined using potentiometric titration. The materials studied have a great potential for sorption processes due to their developed porosity and the presence of a number of active surface functionalities.

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“…The pore size distribution (PSD) f(r) based on the SAXS data was calculated using an integral equation for the scattering intensity I(q) (Pujari et al 2007)…”

Section: Characterization Methodsmentioning

confidence: 99%

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

et al. 2018

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“…The PSD functions were calculated from the SAXS data using the integral equation described in detail elsewhere (Pujari et al 2007). The chord size distributions as a geometrical statistic description of a solid phase in ACs were also calculated from the SAXS data (Dieudonné et al 2000).…”

Section: Methodsmentioning

confidence: 99%

Activation and structural and adsorption features of activated carbons with highly developed micro-, meso- and macroporosity

et al. 2010

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Three sets of activated carbons (ACs) were prepared with the same precursor but activated differently (by CO 2 or water vapour) with various burn-off levels. The ACs demonstrate increased deviation of the pore shape from the slitshaped model with increasing burn-off and contributions of pores of different sizes depending on the activation type. Significant re-arrangement of adsorption complexes, especially of the Van der Waals type characteristic for nonpolar or weakly polar adsorbates (H 2 , CH 4 , CH 2 Cl 2 , CHCl 3 ), occurs in both micropores and mesopores of ACs with decreasing temperature. The behaviour of their mixtures with Electronic supplementary material The online version of this article (

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“…The porosity properties have been measured/ estimated using different methods, such as low-temperature N 2 sorption [3,10,11], cyclic voltammetry [12], film density analysis [1], standard porosimetry (in the case of polyaniline (PANI) and polyparaphenylene (PPP) [13,14], and small-angle X-ray scattering SAXS [15]. SAXS and its modifications have been found to be an advanced scattering technique for investigation of the properties of nanostructured polymeric materials [15][16][17][18][19][20][21][22]. Polymers like PPy [15,19,20], PANI [17,18], poly(p-phenylene) [16], polypropylene [21], poly(amide) and poly(imide) [22] and properties like the degree of crystallinity [19], porosity [15,21,22] and fractal dimension [16][17][18]20,21] have been widely examined.…”

Section: Introductionmentioning

confidence: 99%

“…SAXS and its modifications have been found to be an advanced scattering technique for investigation of the properties of nanostructured polymeric materials [15][16][17][18][19][20][21][22]. Polymers like PPy [15,19,20], PANI [17,18], poly(p-phenylene) [16], polypropylene [21], poly(amide) and poly(imide) [22] and properties like the degree of crystallinity [19], porosity [15,21,22] and fractal dimension [16][17][18]20,21] have been widely examined. Despite the achievements mentioned above, there is still very limited data regarding the dependencies between the thickness and porosity of ECP layers, especially of thin layers.…”

Section: Introductionmentioning

confidence: 99%

Thickness dependence of the porosity of PPy/DDS films

Hallik

Roosalu

Mändar

et al. 2015

European Polymer Journal

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Study of pore structure in grafted polymer membranes using slow positron beam and small-angle X-ray scattering techniques

Cited by 35 publications

References 11 publications

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

Activation and structural and adsorption features of activated carbons with highly developed micro-, meso- and macroporosity

Thickness dependence of the porosity of PPy/DDS films

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