Interaction between α-calcium sulfate hemihydrate and superplasticizer from the point of adsorption characteristics, hydration and hardening process

Guan, Baohong; Ye, Qingqing; Zhang, Jiali; Lou, Wenbin; Wu, Zhongbiao

doi:10.1016/j.cemconres.2009.08.027

Cited by 67 publications

(25 citation statements)

References 19 publications

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“…While, the MW‐160 sample possessed more hydrophilic contact angle than that of CSD, MW‐100 and MW‐130 samples (*** P < .001). This could be attributed to the fact that the α‐CSH with uniform and specific crystal structure induces more water absorption ability from dehydrate state for setting under the liquid drop . Intrinsically, the wettability responds to the bone graft material's ability to absorb water or blood fluid for setting.…”

Section: Resultsmentioning

confidence: 99%

“…Intrinsically, the wettability responds to the bone graft material's ability to absorb water or blood fluid for setting. The setting characteristics of bone graft materials were based on chemical composition, crystal size, crystalline structure and surface energy as well . Wettability and setting time influenced the degree of the absorbed proteins and growth factors in blood which in turn affected angiogenesis, osteocondutive, and bone regeneration of the bone after implantation …”

Section: Resultsmentioning

confidence: 99%

“…This could be attributed to the fact that when calcium sulfate is resorbed, it serves as a concentrated source of calcium, which is needed during mineralization in active bone remodeling as calcium ions play a vital role to provide osteoblasts for bone formation . Moreover, the microwave‐synthesized α‐CSH with uniform and specific crystal structure possesses more water absorption ability in a dehydrated state for setting . The rapid setting induces the proteins and growth factors in blood of the CAM to be quickly absorb in the α‐CSH–treated bone defect area, thus providing enough nutrition for the osteoblasts to facilitate the formation of angiogenesis and osteogenesis.…”

Section: Resultsmentioning

confidence: 99%

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An innovative α‐calcium sulfate hemihydrate bioceramic as a potential bone graft substitute

et al. 2017

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The microstructural, in vitro and in vivo properties of the microwave-synthesized samples were investigated using the optical microscope, scanning electron microscope, X-ray diffraction, differential scanning calorimeter, contact angle goniometer, cell cytotoxicity assay, and chick chorioallantoic membrane (CAM) model in the study. When the calcium sulfate dihydrate (CSD) precursor underwent microwave irradiation treatment at temperatures between 100°C and 160°C, the crystal morphologies and crystalline structures were transformed from (tablet-like CSD (monoclinic)) ? (tablet-like CSD (monoclinic) + long column a-calcium sulfate hemihydrate (a-CSH, hexagonal)) ? (long column CSD (monoclinic) + short column a-CSH (hexagonal)) ? (uniform short column a-CSH (hexagonal)). The high-purity a-CSH with uniform short column crystals around 10 lm in length can be synthesized at 160°C for 10 minutes and exhibits a higher hydrophilic feature in blood. Moreover, the cell cytotoxicity assay indicated that the microwave-synthesized samples possessed well biocompatibility. In vivo results also demonstrated that the microwave-synthesized a-CSH not only induces angiogenesis formation but also facilitates osteogenesis. Therefore, the microwave-synthesized a-CSH is a promising bone graft substitute that can be applied in dental and orthopedic fields. K E Y W O R D Sbioceramics, biocompatibility, microstructure, microwaves, phase transformations Chin-Sung Chen,

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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An innovative α‐calcium sulfate hemihydrate bioceramic as a potential bone graft substitute

et al. 2017

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“…Therefore, formulating inhibitor with SP may be able to reduce the strength loss. The adsorption conformation of β-naphthalene sulfonic acid type (BNS) and PC on β-calcium sulfate hemihydrate, and the adsorption form of SMF and PC on α-calcium sulfate hemihydrate were studied [15,16] . However, the use of several admixtures in a building material formulation can cause undesired interactions [17] .…”

Section: Introductionmentioning

confidence: 99%

Effect of compounding of sodium tripolyphosphate and super plasticizers on the hydration of α-calcium sulfate hemihydrate

Pan

Wang

2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The inhibition and its mechanism of sodium tripolyphosphate (STP) composited with super plasticizers (SPs) on hydration of α-calcium sulfate hemihydrate were studied by setting time, strength, hydration heat, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electronic probe micro analysis (EPMA), scanning electron microscopy (SEM) and differential scanning calorimeter (DSC) measurements. The experimental results show that compared with STP addition, compositing STP with polycarboxylate (PC) plasticizer, the fi nal setting time is prolonged from 0.5h to 2hs. While formulating STP with naphthalene-based plasticizer (NAP) or sulfonate melamine formaldehyde plasticizer (SMF), the fi nal setting time is reduced to quarter of an hour. Similar changes can also be found in the rate of exothermic hydration and hydration degree. Formulating STP with suitable addition of PC can enhance the strength, while compositing STP and NAP or SMF weakens the strength. Besides, adding STP or STP and SMF, obvious movement (more than 1ev) of binding energy of Ca2p1/2 and Ca2p3/2 is detected. Compared with STP addition, content of the characteristic element (P) of STP is cut down form 1.1% to 0.49% by compositing STP with SMF. Furthermore, as hydration age increases, hydration inhibition in the presence of admixtures weakens and even disappears within 56 h.

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“…The reaction of gypsum with water [18][19][20] is divided into three main stages which involve a set of coupled chemical processes:…”

Section: Hydration/crystallization Processmentioning

confidence: 99%

Hydroxyethyl methyl cellulose as a modifier of gypsum properties

Mróz

Mucha

2018

J Therm Anal Calorim

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The study is focused on the influence of a water-soluble polymer (in weight fraction up to 1.5%), cellulose derivativeshydroxyethyl methyl cellulose, on gypsum properties. Gypsum setting involves two processes: gypsum hydration/crystallization and probably formation of a polymer film in material pores. The processes are studied by various methods such as setting time and mechanical measurements, scanning electron microscopy and differential scanning calorimetry. The additive acts as a retarder (an increase in setting time), and it modifies the morphology of calcium sulfate dihydrate crystals, leading to the change in mechanical properties-an increase in bending stress. The mechanism of gypsum crystal growth during hemihydrate hydration is predicted to be a nucleation control process (the Avrami equation is applied). The value of nucleation rate constant decreases with an increasing additive content.

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Interaction between α-calcium sulfate hemihydrate and superplasticizer from the point of adsorption characteristics, hydration and hardening process

Cited by 67 publications

References 19 publications

An innovative α‐calcium sulfate hemihydrate bioceramic as a potential bone graft substitute

An innovative α‐calcium sulfate hemihydrate bioceramic as a potential bone graft substitute

Effect of compounding of sodium tripolyphosphate and super plasticizers on the hydration of α-calcium sulfate hemihydrate

Hydroxyethyl methyl cellulose as a modifier of gypsum properties

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