Polyvinyl alcohol: A taste sensing material

Majumdar, Sarmishtha; Adhikari, Basudam

doi:10.1016/j.snb.2005.07.052

Cited by 36 publications

(28 citation statements)

References 11 publications

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“…Various peak positions at room humidity and at high humidity and their assignments are given in Table . Standard IR peaks as obtained from the literature are also given …”

Section: Resultsmentioning

confidence: 99%

Combination of polymeric substrates and metal–polymer nanocomposites for optical humidity sensors

Mahapure

Gangal

Aiyer

et al. 2018

J of Applied Polymer Sci

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This paper reports a combination of self-supported, 80-μm-thick polymeric substrates of poly(dimethyl siloxane), poly(methyl methacrylate), poly(vinyl alcohol) (PVA), and poly(N-vinylpyridine) (PVP) and nanocomposites, silver nanoparticle (nAg)/ 0.1% PVP (S1) and nAg/0.1% PVA (S2), for use in optical-transmission-type humidity sensors. Composites are synthesized by a chemical reduction method at optimum conditions, giving particle sizes of 5-10 nm and 10-20 nm, respectively, for nAg/0.1% PVP and nAg/ 0.1% PVA. Composite formation is confirmed using Fourier transform infrared spectroscopy (FTIR). The role of polymers in obtaining a smaller Ag particle size is studied using ultraviolet-visible spectroscopy and transmission electron microscopy. The nanocomposite is coated onto substrates either on a single side or on both sides by dip coating. The humidity response of nAg/0.1% PVP-0.1% PVP-nAg/0.1% PVP (S1-PVP-S1) sensors, measured using the direct optical transmission method, exhibits an enhancement in sensitivity [0.88 AE 0.04 (/% RH)] for the humidity range 6-94% RH and response (6 s) and recovery (8 s) times compared to nAg/0.1% PVP-PVP S1-PVP sensors and a linear response (R 2 ≥ 0.99). An attempt is made to explain the sensing process with the help of FTIR spectra in dry and humid environments.

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“…Various peak positions at room humidity and at high humidity and their assignments are given in Table . Standard IR peaks as obtained from the literature are also given …”

Section: Resultsmentioning

confidence: 99%

Combination of polymeric substrates and metal–polymer nanocomposites for optical humidity sensors

Mahapure

Gangal

Aiyer

et al. 2018

J of Applied Polymer Sci

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“…Recently, two publications, Shu et al [26] and Gaaz et al [27], both in press, have shown that the specific surface area was improved to new frontiers, as far as 608 m 2 /g and 306 m 2 /g, by treating HNTs with alkali solution, followed by acid etching, respectively. Briefly, esterification is obtained via PVA-MA crosslinking [28,29]. Researchers have been exploring different levels for the effectiveness of MA crosslinking while their expectations varied within a reasonable level of differences, especially in thermal properties.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Surface Improvement of Halloysite Nanotubes

et al. 2017

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A novel development on halloysite-polyvinyl alcohol (HNTs-PVA) nanocomposites has been conducted using malonic acid (MA) by crosslinking PVA and HNTs. PVA-MA crosslinking produces smooth surfaces, which play an important role in enhancing the properties of HNTs-PVA nanocomposite. The crystallographic structures of crosslinked HNTs-PVA show almost no change as depicted by the X-ray diffraction (XRD)-2θ-peak, suggesting that MA has no or little influence on the crystallographic structure of the HNTs-PVA. Images taken by field emission scanning electron microscope (FESEM) suggest possible effects of MA on the morphology and internal features of HNTs-PVA by reducing the agglomeration of HNTs, which is considered a decisive step in improving the surface qualities of HNTs. Investigating the samples using the Brunauer-Emmelt-Teller (BET) technique showed that the surface area was increased by about 10 times, reaching the second highest recorded results compared to the HNTs, which could be considered a breakthrough step in enhancing the properties of HNTs-PVA due to MA crosslinking.

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“…In addition to PVA as a crosslinker, glyoxal glutaraldehyde is the other universally crosslinker for polymers that primarily contain amine groups such as proteins (Yeom & Lee 1996;Zhang et al 2010). Other attempts have shown that crosslinking of PVA can be performed by utilizing dicarboxylic acids such as a malonic acid (MA) with sulphuric acid (Takip et al 2015) which is widely considered as a catalyst to obtain esterification (Jian & Ming 1987;Majumdar & Adhikari 2006).…”

Section: Introductionmentioning

confidence: 99%