Templated synthesis of graphene nanosheets within curling layered nanostructure of halloysite nanotubes

Cheng, Zhi‐Lin; Cao, Bao-Chong; Wu, Pei-Rong; Ma, Liang; Liu, Zan

doi:10.1016/j.matlet.2017.05.071

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…XRF results in Table 1 show that SiO 2 and Al 2 O 3 contents occupy the major components of halloysite; the commonly reported theoretical ratio is 2:1 in many literatures [16]. Actually, the ratio was often affected by the contents of impurities.…”

Section: Xrf Analysismentioning

confidence: 87%

“…Significant attention has been focused on the application of halloysite into many fields in these years, such as the applications in chemically blocked and controlled release [16][17][18][19][20][21], biomimetic nanoreactors [22][23][24], medicine carrier and biological antibacterial materials [25][26][27], catalysis supports [28][29][30][31][32], hydrogen storage matrix [33][34][35], food packaging applications [36], mineral templates and other functional materials [37][38][39]. Many reviews have summarized the characters and application fields of Hal minerals [40,41], for example, Yuan et al [42] introduced the main structural features and properties of halloysite, especially focused on the structure and morphology of halloysite and its changes, the formation mechanism of tubular structures, the physico-chemical properties, chemical modification of surfaces, and halloysite-based advanced materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mineralogy and Physico-Chemical Data of Two Newly Discovered Halloysite in China and Their Contrasts with Some Typical Minerals

Ouyang

Zhang

et al. 2018

Minerals

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Abstract:We report in this article the systematical acquisition of physico-chemical parameters for two newly discovered halloysite (Hal) minerals from Shiyan and Tongling in China. As the comparative reference, the data from Hal in Linfen, Chenxi, and the salt lake in Australia (samples were abbreviated as Hal-AU, Hal-SY, Hal-LF, Hal-CX and Hal-TL, respectively) were also investigated using X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), Fourier transformation infrared spectroscopy (FTIR), differential scanning calorimetry-thermogravimetry (DSC-TG), X-ray fluorescence, surface zeta potential measurements and N 2 adsorption-desorption isotherms. The newly found minerals were probably formed in hydrothermal leaching and sedimentary circumstances. The Hal-SY contains 7 Å-halloysite and dickite, while Hal-TL contains 10 Å-halloysite with some alunite (similar with Hal-CX). Other impurities found in the samples include quartz, gibbsite, iron oxide and anatase. All of them showed tubular morphology with diameter in the range of 30-90 nm and a length of 300-2500 nm, while the Hal-SY has the largest inner diameter to about 150 nm. Specific surface areas varied from 26.0~59.0 m 2 ·g −1 . In addition, maximum CEC (cation exchange capacity) of the newly found Hal was about 40 cmol/kg, while that of Hal-AU was relatively low (8 cmol/kg) due to the sedimentary nature of Salt Lake circumstances. The surface charge was predominantly negative over most of the relevant pH range (>2.0). It can be concluded that the different morphology and impurity content of halloysite will greatly affect the surface area, pore volume, and cationic exchange capacity (CEC) of the minerals.

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Section: Xrf Analysismentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Mineralogy and Physico-Chemical Data of Two Newly Discovered Halloysite in China and Their Contrasts with Some Typical Minerals

Ouyang

Zhang

et al. 2018

Minerals

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“…Figure 1 (c) shows the UV-Vis spectrum of the graphene dispersions: graphene shows flat absorption in visible-IR region with broad absorption peak around 270 nm corresponding to π-π * electron transition. 42 Small pyrene peaks are also observed in the region between 300 -400 nm. From the UV-Vis spectra, we calculated a concentration of 0.232 and 0.074 mg•ml -1 for graphene dispersions prepared with py-lys and py-tau, respectively.…”

Section: Gr/py-lysmentioning

confidence: 97%

Charge-tunable graphene dispersions in water made with amphoteric pyrene derivatives

Shin

Just‐Baringo

Zarattini

et al. 2019

Mol. Syst. Des. Eng.

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“…The low intensities indicate that the products are adequately exfoliated into graphene nanosheets and exhibit the high-degree graphitization. 25 As shown in Figure 2C,D, GN-900-C nanosheets with a paper-like structure are randomly stacked together. It can be seen that the nanosheets were successfully exfoliated and both exhibited large size and ultra-thin structures.…”

Section: Resultsmentioning

confidence: 99%

Preparation and tribological properties of eco‐friendly as‐exfoliated graphene in grease

Kong¹,

Liu²,

Cheng

2020

Lubrication Science

Self Cite

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The exfoliation for few layers of graphene was prospective for scale output due to low cost and processable advantages. However, the massive production had some obstacles such as high pollution with organics and harmful elements and use of rare metal. Herein, we developed a facile and eco-friendly expansionreduction exfoliation method to prepare graphene from graphene oxide (GO) with aid of oxalic acid(H 2 C 2 O 4). The as-exfoliated graphene nanosheets possessed a 10-layered thickness and large lateral size of approximately 0.5 μm. As a prospective application, the as-exfoliated graphene nanosheets were conducted as additive in the grease for the sake of antifriction and antiwear. The results showed that the friction reduction and wear resistant properties were improved by 35.8% and 32.8%, respectively. The friction reducing mechanism of graphene in grease was proposed due to forming a protective film.

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Templated synthesis of graphene nanosheets within curling layered nanostructure of halloysite nanotubes

Cited by 9 publications

References 18 publications

Mineralogy and Physico-Chemical Data of Two Newly Discovered Halloysite in China and Their Contrasts with Some Typical Minerals

Mineralogy and Physico-Chemical Data of Two Newly Discovered Halloysite in China and Their Contrasts with Some Typical Minerals

Charge-tunable graphene dispersions in water made with amphoteric pyrene derivatives

Preparation and tribological properties of eco‐friendly as‐exfoliated graphene in grease

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