6/5/2023 0 Comments Carbon nanotube crystalviewerWe found that an optimum 0.2 vol% concentration of acid‐functionalized GNPs improves the compressive and the shear bond strength of the prepared cement by approximately 42 and 175% as compared to the plain cement, respectively. Therefore, eliminating the above‐mentioned water separation can enhance cement sealing properties. On the other hand, the squeeze of water out of the lower parts of the cement slurry and its upward migration can develop preferential paths for oil and gas migration. We measured zero free fluid at room temperature for different concentrations of GNPs, demonstrating uniform dispersion of nanoparticles within the cement matrix. We investigated the effect of modified GNPs on the unconfined compressive strength (UCS), shear bond strength, thickening time, rheological characteristics, and the free fluid content. To examine the role of spatial distribution of GNPs on the hardened cement nanocomposite, samples with different concentrations of GNPs were tested. Also, some experiments were repeated under the pressure and temperature conditions up to 5,160 psi and 126☏, respectively, to examine pumpability and behavior of cement slurry at bottomhole conditions. To mimic downhole conditions, cement slurries are cured at 3,000 psi and 190☏ for 24 hours. (Wolfram Demonstrations Project) Crystal Viewer (Wolfram Demonstrations. The efficiency of proposed methods on the overall properties of the cement is examined before and after its setting. Carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) represent a novel class. We present two dispersion methods on the basis of physical and chemical treatments of the surface properties of GNPs. In this study, we focus on the effect of surface‐modified GNPs on the overall mechanical properties of both cement slurry and hardened cement slurry affecting the permeability of cement. GNPs possess high surface area to volume ratios. The purpose of this research is containing or at least minimizing the intrinsic and developed flow paths through the cementitious matrix with the help of surface‐modified GNPs. On one hand, it is the inherent microstructural defects of cement, including pores and microcracks, that results in the intrinsic permeability of cement, and on the other hand, cracking, micro‐annuli, or other flow paths developed through the disturbed cement by connecting the pre‐existing microstructural defects determine the equivalent permeability of set cement. The primary role of the cement sheath, which is zonal isolation, can be significantly affected by the permeability of set cement (hardened cement slurry). This design strategy may provide a promising method to manufacture high-precision, remote-control smart devices.We propose a novel cement additive made of graphite nanoplatelets (GNPs) for improved hydraulic isolation and durability of oil and gas wells. Furthermore, the shape transformation, locomotion, and photo-actuation capabilities allow the CNT/LCE actuator to be applied in high-definition biomechanical applications, such as phototactic flowers, serpentine robots and artificial muscles. When embedding an ultralow loading of CNTs (0.1 wt%), the tensile strength of the LCE increased by 420% to 13.89 MPa (||) and 530% to 3.94 MPa (⊥) and exhibited a stable response to repeated alternating cooling and heating cycles, as well as repeated UV and infrared irradiation. Polymer/CNT composites have better mechanical properties with higher electrical conductivity for biosensor applications 55. Highly effective dispersion and nematic orientation of CNTs in the intrinsic LCE matrix were observed to yield anchoring energies ranging from 1.65 × 10 −5 J m −2 to 5.49 × 10 −7 J m −2, which significantly enhanced the mechanical and photothermal properties of the photoresponsive elastomer. Carbon nanotubes (CNTs) can potentially be used in varous fields including nanotechnology, bioengineering, and biosensors. Herein, a facile strategy was proposed to prepare an intrinsically-photoresponsive elastomer by chemically grafting carbon nanotubes (CNTs) into a thermally-sensitive liquid-crystalline elastomer (LCE) network. Photoresponsive soft actuators with the unique merits of flexibility, contactless operation, and remote control have huge potential in technological applications of bionic robotics and biomedical devices.
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