Effect of protein peptides with different molecular weights on the setting and hydration process of gypsum

Ding, Xiaoxia; Wei, Bangquan; Deng, Minggao; Chen, Hui; Zhi-hua, Shan

doi:10.1016/j.conbuildmat.2021.126185

Cited by 20 publications

(8 citation statements)

References 41 publications

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“…In addition, the surface energy was reduced by a colloid membrane leading to inhibition of the growth rate of CaSO 4 ·2H 2 O crystal. In sync with previous data [ 32 , 33 , 34 ], the hydration process and the formation of the crystals network were slowed. In addition, the membrane became thicker and more stable with the increase in retarder, resulting in a longer setting time.…”

Section: Resultssupporting

confidence: 87%

The Influences of Soluble Phosphorus on Hydration Process and Mechanical Properties of Hemihydrate Gypsum under Deep Retarding Condition

et al. 2022

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Phospho-gypsum is an industrial solid waste discharged from the phosphate production process. The waste includes complex impurities such as phosphoric acid and its salts, fluoride, and organics. Usually, retarders are mixed in gypsum-based building materials to extend setting time. Although the effects of the impurities on hydration properties and the mechanical strength of calcined gypsum have been analyzed, the impact and mechanism of soluble phosphorus on the phospho-gypsum under retardation is yet to be defined. In this study, we employed thermogravimetry (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM) to evaluate the hydration kinetics, phase transformation, structure, and morphology of the calcined gypsum. The data showed that the retarder or soluble phosphorus prolonged the setting time. A single retarder considerably shortened the initial setting time from 95 min to 60 min, even at the lowest dosage of 0.1 wt.% soluble phosphorus. In addition, drying flexural and compressive strengths were markedly decreased. On the other hand, the induction period was advanced with extension of acceleration and deceleration stage. SEM results indicated that the crystal morphology of the gypsum changed from a long to short column or block. An EDS analysis showed that phosphates were concentrated on the surface of gypsum crystals.

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Section: Resultssupporting

confidence: 87%

The Influences of Soluble Phosphorus on Hydration Process and Mechanical Properties of Hemihydrate Gypsum under Deep Retarding Condition

et al. 2022

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“…Meanwhile, they also showed high consistency with the morphology changes displayed in Figure 5. Coatings 2021, 11, x FOR PEER REVIEW 6 of 10 dihydrate [29]. From the results of the XRD in a in Figure 7, hydroxyapatite (2θ = 25.9°, 28.9°, 31.7°, 34.1°, 39.8°, 46.7°, 49.5°, 53.2°) was the main component of the artificial weathering bone, which is consistent with that of archeological bones.…”

Section: Resultssupporting

confidence: 66%

“…After introduction of nano CSH particles in the bone sample, the SO 4 2− bands (1141 and 666 cm −1 ) and typical O-H band at 3612 cm −1 appear in b in Figure 6 and they are assigned to the calcium sulphate hemihydrate [26]. After further hydration treatment, the typical O-H band of calcium sulfate hemihydrate at 3612 cm −1 disappeared and the typical O-H bands of calcium sulfate dihydrate at 3405 and 1688 cm −1 appeared (c in Figure 6), indicating the transformation from calcium sulfate hemihydrate to calcium sulfate dihydrate [29]. From the results of the XRD in a in Figure 7, hydroxyapatite [30] appeared, as shown in c in Figure 7.…”

Section: Resultsmentioning

confidence: 94%

Consolidation of Fragile Oracle Bones Using Nano Calcium Sulfate Hemihydrate as a Protectant

Liu

et al. 2022

Coatings

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Herein, a nano calcium sulfate hemihydrate suspension in an alcohol solvent was prepared and explored as a novel protectant for fragile oracle bones. The consolidation method involved first introducing the suspension and then adding water into the bones. Through this method, cohesive calcium sulfate dihydrate formed in the bones and can act as a reinforcing material. The protective effect was studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), hardness, porosity, and color difference determination. The results showed that such consolidation increased the strength of the bone samples significantly, and only slightly changed the appearance and porosity of the bone samples, indicating a good prospect for applying nano calcium sulfate hemihydrate in the conservation of indoor fragile bone relics.

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“…Zeta (ξ)-potential was determined by a Zetasizer Nano ZS90 (Malvern Instrument, Malvern, UK) at room temperature in a suspension of 1 mg/mL prepared from freeze-dried samples dissolved in 0.1 mol/L sodium phosphate buffer (pH = 7.0). 23 The surface hydrophobicity of the sample (2 mg/mL) was determined by the 1-aniline-8-naphthalene sulfonic acid method using a fluorescence spectrophotometer (PerkinElmer, MA, USA) with excitation and emission wavelengths of 390 and 470 nm, respectively. In order to collect Fourier transform infrared (FTIR) spectra, 2 mg sample and 200 mg pure KBr were ground evenly and pressed into a transparent tablet.…”

Section: Dynamic Light Scattering and Transmission Electron Microscopymentioning

confidence: 99%

Characterization, Formation Mechanism, and Curcumin Delivery of Buckwheat Peptide-Based Emulsion Gels

Yin

Zhang

et al. 2023

J. Agric. Food Chem.

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This study aimed to construct a natural peptide-based emulsion gel (PG) using small peptides (∼2.2 kDa) by mild enzymatic hydrolysis of buckwheat proteins. The obtained PG presented a porous and tight texture and solid–gel viscoelasticity compared with its parent protein-based emulsion gel. Meanwhile, it exhibited good resistance against heating and freeze-thawing. Furthermore, peptide–oil interaction analysis revealed that the gel matrix was enhanced by the hydrophobic aggregation between peptides and oil molecules, H-bonding interaction of peptide molecules, and peptide–oil aggregate repulsion force. Finally, in vitro intestinal digestion experiments demonstrated that PG could embed and pH-responsively release curcumin in the gastrointestinal tract at a release rate of 53.9%. The findings unfold promising opportunities for using natural PG in a range of applications relying on large proteins or other synthesized molecules.

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Effect of protein peptides with different molecular weights on the setting and hydration process of gypsum

Cited by 20 publications

References 41 publications

The Influences of Soluble Phosphorus on Hydration Process and Mechanical Properties of Hemihydrate Gypsum under Deep Retarding Condition

The Influences of Soluble Phosphorus on Hydration Process and Mechanical Properties of Hemihydrate Gypsum under Deep Retarding Condition

Consolidation of Fragile Oracle Bones Using Nano Calcium Sulfate Hemihydrate as a Protectant

Characterization, Formation Mechanism, and Curcumin Delivery of Buckwheat Peptide-Based Emulsion Gels

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