Anisotropic robustness of talc particles after surface modifications probed by atomic force microscopy force spectroscopy

Dokmai, Vipada; Sinthiptharakoon, Kitiphat; Phuthong, Witchukorn; Pavarajarn, Varong

doi:10.1016/j.partic.2021.04.008

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…In Figure S4c, the O 1s spectrum of PDMS showed two peaks at 531 and 532 eV, which correspond to Si–O bonds and surface-adsorbed hydroxyl species (−OH), respectively. From this characterization, we surmise the existence of talc, a hydrated magnesium silicate compound (Mg 3 Si 4 O 10 (OH) 2 ), on the PDMS surface, likely being present due to the manufacturing process . The presence of talc could be the reason for the deviations in atomic ratios from the theoretical stoichiometry, C/Si/O = 2:1:1 in the PDMS samples.…”

Section: Resultsmentioning

confidence: 79%

“…From this characterization, we surmise the existence of talc, a hydrated magnesium silicate compound (Mg 3 Si 4 O 10 (OH) 2 ), on the PDMS surface, likely being present due to the manufacturing process. 38 The presence of talc could be the reason for the deviations in atomic ratios from the theoretical stoichiometry, C/Si/O = 2:1:1 in the PDMS samples. In the case of the pTi-embedded PDMS samples, the O 1s peak can be fitted with three peaks: one peak at 530 eV assigned to O 1s in TiO 2 , one peak at 531 eV assigned to Si−O bonds in PDMS, and one peak at 532 eV, which can be assumed to arise from the presence of a hydrated magnesium silicate.…”

Section: Xps Analysismentioning

confidence: 95%

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Surface Characteristics and Bone Biocompatibility of Cold-Sprayed Porous Titanium on Polydimethylsiloxane Substrates

Liao

King

Zhu

et al. 2023

ACS Biomater. Sci. Eng.

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A variant of the cold spray (CS) technique was applied for the functionalization of polymer-based materials such as polydimethylsiloxane (PDMS) to improve the extent of mammalian cell interactions with these substrates. This was demonstrated by the embedment of porous titanium (pTi) into PDMS substrates using a single-step CS technique. CS processing parameters such as gas pressure and temperature were optimized to achieve the mechanical interlocking of pTi in the compressed PDMS to fabricate a unique hierarchical morphology possessing micro-roughness. As evidenced by the preserved porous structure, the pTi particles did not undergo any significant plastic deformation upon impact with the polymer substrate. The thickness of the particle embedment layer was determined, by cross-sectional analysis, ranging from 120 μm to over 200 μm. The behavior of osteoblast-like cells MG63 coming into contact with the pTi-embedded PDMS was examined. The results showed that the pTi-embedded PDMS samples promoted 80−96% of cell adhesion and proliferation during the early stages of incubation. The low cytotoxicity of the pTi-embedded PDMS was confirmed, with cell viability of the MG63 cells being above 90%. Furthermore, the pTi-embedded PDMS facilitated the production of alkaline phosphatase and calcium deposition in the MG63 cells, as demonstrated by the higher amount of alkaline phosphatase (2.6 times) and calcium (10.6 times) on the pTi-embedded PDMS sample fabricated at 250 °C, 3 MPa. Overall, the work demonstrated that the CS process provided flexibility in the parameters used for the production of the modified PDMS substrates and is highly efficient for the fabrication of coated polymer products. The results obtained in this study suggest that a tailorable porous and rough architecture could be achieved that promoted osteoblast function, indicating that the method has promise in the design of titanium-polymer composite materials applied to biomaterials used in musculoskeletal applications.

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Section: Resultsmentioning

confidence: 79%

Section: Xps Analysismentioning

confidence: 95%

Surface Characteristics and Bone Biocompatibility of Cold-Sprayed Porous Titanium on Polydimethylsiloxane Substrates

Liao

King

Zhu

et al. 2023

ACS Biomater. Sci. Eng.

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“…Its specific gravity ranges from 2.7 to 2.8, and it offers high chemical inertness. Talc layers are weakly bonded with each other through Van der-Waals forces forming the lamellar structure, which facilitates easy shearing, giving it a good self-lubrication performance because the lamellar structure facilitates easy shearing [ 32 , 33 , 34 ]. Therefore, 2D talc nanosheets are considered as one of the best candidate materials for the development of green lubricating additives.…”

Section: Introductionmentioning

confidence: 99%

Using Green, Economical, Efficient Two-Dimensional (2D) Talc Nanosheets as Lubricant Additives under Harsh Conditions

et al. 2022

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Two-dimensional (2D) nanomaterials have attracted much attention for lubrication enhancement of grease. It is difficult to disperse nanosheets in viscous grease and the lubrication performances of grease under harsh conditions urgently need to be improved. In this study, the 2D talc nanosheets are modified by a silane coupling agent with the assistance of high-energy ball milling, which can stably disperse in grease. The thickness and size of the talc nanosheet are about 20 nm and 2 µm. The silane coupling agent is successfully grafted on the surface of talc. Using the modified-talc nanosheet, the coefficient of friction and wear depth can be reduced by 40% and 66% under high temperature (150 °C) and high load (3.5 GPa), respectively. The enhancement of the lubrication and anti-wear performance is attributed to the boundary adsorbed tribofilm of talc achieving a repairing effect of the friction interfaces, the repairing effect of talc on the friction interfaces. This work provides green, economical guidance for developing natural lubricant additives and has great potential in sustainable lubrication.

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Soft matter analysis via atomic force microscopy (AFM): A review

Joshua,

Cheng,

Lau

2023

Applied Surface Science Advances

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Anisotropic robustness of talc particles after surface modifications probed by atomic force microscopy force spectroscopy

Cited by 6 publications

References 35 publications

Surface Characteristics and Bone Biocompatibility of Cold-Sprayed Porous Titanium on Polydimethylsiloxane Substrates

Surface Characteristics and Bone Biocompatibility of Cold-Sprayed Porous Titanium on Polydimethylsiloxane Substrates

Using Green, Economical, Efficient Two-Dimensional (2D) Talc Nanosheets as Lubricant Additives under Harsh Conditions

Soft matter analysis via atomic force microscopy (AFM): A review

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