Rheology and structure of aqueous bentonite-polyvinyl alcohol dispersions

İşçi, Sevim; Ünlü, Cüneyt H.; Atici, Oya Gali̇oğlu; Güngör, Nurfer

doi:10.1007/bf02914075

Cited by 42 publications

(12 citation statements)

References 9 publications

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“…The sharp bands at 3696.17 cm −1 and 3626.39 cm −1 are attributed to the N-H stretching for the UBC and 2-ABC types as it is the same as the peaks at 3697 and 3620 cm −1 reported by Georges-IVO (2005). The peaks at 3436.41 cm −1 in the 2-ABC sample and 3430.21 cm −1 in the UBC are assigned to OH stretching which is close to 3426 cm −1 and 3420 cm −1 reported by Isci et al (2006), Aroke et al (2013). The bands 1644.47 cm −1 and 1637.99 cm −1 are present in UBC and 2-ABC samples and 1 3…”

Section: Instrumental Characterization Of Unmodified and Modified Clasupporting

confidence: 84%

Preparation and characterization of adsorbents derived from bentonite and kaolin clays

et al. 2018

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The comparative study on preparation and characterization of modified bentonite and kaolin clay types is aimed at establishment of the ability of these clay types to adsorb pollutants. Its low cost, availability and recovery of clay give it added advantage of an effective adsorbent. The modified clay types were prepared by impregnation using various concentrations of either H 2 SO 4 or NaOH in w/v ratio of 1:2. The physicochemical and adsorptive properties were investigated using standard physicochemical methods like moisture content, bulk density, pH, iodine and methylene blue numbers. FTIR, XRD and SEM analyses were also conducted on these clay types. Unmodified kaolin clay exhibited lowest moisture content (1.12%) while unmodified bentonite clay type had highest value (3.98%). The peaks at 3435 cm −1 and 3410 cm −1 assigned N-H stretching frequency were obtained for 2 M H 2 SO 4 modified and unmodified bentonite clay types, respectively. The peaks at 912 cm −1 and 914 cm −1 that indicate the presence of Al-Al-OH deformation frequency were obtained for unmodified bentonite clay type and 2 M H 2 SO 4 modified bentonite clay, respectively. The physical surface morphology of the clay types revealed the presence of pores with irregular shapes, while their XRD analysis showed that the clay types are crystalline. The modified clay types exhibited better potential adsorbent for removal of small metallic or gas molecules as well as large organic molecules. Adsorbents could also remove cations or anions of pollutants since their surface charge could be positive or negative depending upon pH condition.

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Section: Instrumental Characterization Of Unmodified and Modified Clasupporting

confidence: 84%

Preparation and characterization of adsorbents derived from bentonite and kaolin clays

et al. 2018

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“…e FT-IR spectral examination of purified bentonite revealed different bands (Table 2) comparable to those defined by the literature [14][15][16][17][18]. Two bands of different intensities, located at 3632 cm −1 and 3437 cm −1 , also defined by Jeddi et al [19], constitute the spectral signature specific to bentonite which allows its identification in a mixture of species.…”

Section: Datasupporting

confidence: 69%

FT-IR Spectroscopy Applied for Identification of a Mineral Drug Substance in Drug Products: Application to Bentonite

Ouhaddouch

Cheikh

Idrissi

et al. 2019

Journal of Spectroscopy

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The aim of this study is to prove the effectiveness of IR spectroscopy as an identification test able to discriminate between mineral compounds in mixtures. This work is concerned with the physical characterisation of purified bentonite, bentonite in organic mixtures and organic excipients, and mineralized organic mixture containing bentonite using FT-IR spectroscopy. The different spectra were compared with each other in order to determine fingerprints of bentonite represented by bands located at 3632 cm−1 and 3437 cm−1. The analysis of the spectra of the nonmineralized mixture demonstrates the presence of two bands at 1454 and 2928 cm−1, superimposed on those of the excipients and which disappear after 2 hours of mineralization at 500°C. Finally, we notice a displacement of the stretching band of H2O to the right with increasing the proportion of the excipients.

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“…[39] The constant proportionality is expressed as the viscosity. Slightly loaded salt does not influence the linear relationship significantly and the viscosity is within the same magnitude.…”

Section: Rheological Behaviormentioning

confidence: 99%

Manipulated Electrospun PVA Nanofibers with Inexpensive Salts

Ding

Wei

Zhu

et al. 2010

Macro Materials & Eng

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PVA nanofibers have been successfully prepared via an electrospinning process by optimizing the electrospinning operational parameters including applied voltage, polymer concentration, feed rate, and working distance. Inexpensive NaCl and Fe(NO3)3 are found to reduce the fiber size drastically (minimum of 157 and 169 nm, respectively) even at a low loading. The thermal stability is investigated by both thermogravimetric analysis and differential scanning calorimetry. Fourier transform infrared spectroscopy is utilized to characterize the functionality of the fibers and to investigate the interaction between PVA and inorganic additions. Glass transition and melting temperatures of the PVA fibers have slight change with the increase of the salt loading.magnified image

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Rheology and structure of aqueous bentonite-polyvinyl alcohol dispersions

Cited by 42 publications

References 9 publications

Preparation and characterization of adsorbents derived from bentonite and kaolin clays

Preparation and characterization of adsorbents derived from bentonite and kaolin clays

FT-IR Spectroscopy Applied for Identification of a Mineral Drug Substance in Drug Products: Application to Bentonite

Manipulated Electrospun PVA Nanofibers with Inexpensive Salts

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