In Situ Rheological Properties Monitoring of Cementitious Materials through the Piezoelectric-based Electromechanical Impedance (EMI) Approach

2021 ◽  
Author(s):  
Guangshuai Han ◽  
◽  
Yen-Fang Su ◽  
Siwei Ma ◽  
Tommy Nantung ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Cementitious Materials ◽  
Electromechanical Impedance

Effect of stretching speed on morphologies and properties of in situ microfibrillar POE/PLA composites

2020 ◽  
pp. 089270572093917
Author(s):  
Jing Sun ◽  
Anrong Huang ◽  
Shanshan Luo ◽  
Min Shi ◽  
Heng Luo ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Rheological Properties ◽  
Loss Modulus ◽  
Weight Ratio ◽  
Poly Lactic Acid ◽  
Electron Microscopic ◽  
Dynamic Rheological Properties ◽  
Scanning Electron Microscopic ◽  
Ethylene Octene Copolymer

In situ microfibrillar ethylene–octene copolymer (POE)/poly(lactic acid) (PLA) composites (MFCs) with different phase morphologies were prepared by controlling the stretching speed and maintaining the weight ratio of POE/PLA of 80/20. Four different stretching speeds were employed to study the effect of PLA microfibrillar morphology on tensile, crystalline, and rheological properties of MFCs. Scanning electron microscopic images revealed that the morphology of PLA phase was strongly influenced by stretching speed. MFCs with highest aspect ratio and smaller diameter of PLA microfibrils were obtained with a stretching speed of 60 rpm. The PLA microfibrils with high aspect ratio had the best reinforcement effect on MFCs. The dynamic rheological properties indicated that the MFCs achieved higher storage modulus and loss modulus at the stretching speed of 60 rpm.

Friction and Rheological Properties of Meso-Porous MCM-41/Unsaturated Polyester In Situ Composites

2014 ◽  
Vol 599-601 ◽  
pp. 18-21
Author(s):  
Shu Long Hu ◽  
Jian Lv ◽  
Feng Ying Lu ◽  
Hua Shan Liu ◽  
De Ming Zeng
Keyword(s):  
Wear Resistance ◽  
Rheological Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Polyester Resin ◽  
In Situ Polymerization ◽  
Unsaturated Polyester ◽  
Roller Milling ◽  
Mcm 41

In this paper, meso-porous MCM-41 was synthesized at room temperature using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the template agent. Then MCM-41/unsatura-ted polyester resin (UPR) materials were prepared by in-situ polymerization with the meso-porous MCM-41. MCM-41/UPR in-situ composites were prepared by roller milling and molding processes. Effects of meso-porous MCM-41 on rheological properties and wear resistance of the MCM-41/UPR composites have been investigated. It is shown that MCM-41 has a diameter in range of 4-5 nm and the pores are highly ordered. MCM-41 can improve the rheological properties and wear resistance of the composites. When MCM-41 content is 2%, the mass abrasion loss is decreased by 37.4%.

Characterization of morphological and rheological properties of rigid magnetorheological foams via in situ fabrication method

2019 ◽  
Vol 54 (21) ◽  
pp. 13821-13833 ◽  
Author(s):  
Noor Sahirah Muhazeli ◽  
Nur Azmah Nordin ◽  
Saiful Amri Mazlan ◽  
Norhaniza Rizuan ◽  
Siti Aishah Abdul Aziz ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Fabrication Method ◽  
In Situ Fabrication

scholarly journals In Situ Gel of Triamcinolone Acetonide-Loaded Solid Lipid Nanoparticles for Improved Topical Ocular Delivery: Tear Kinetics and Ocular Disposition Studies

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 33 ◽  
Author(s):  
Akshaya Tatke ◽  
Narendar Dudhipala ◽  
Karthik Janga ◽  
Sai Balguri ◽  
Bharathi Avula ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Triamcinolone Acetonide ◽  
Solid Lipid Nanoparticles ◽  
Lipid Nanoparticles ◽  
Gellan Gum ◽  
Ocular Tissues ◽  
In Situ Gel ◽  
Solid Lipid ◽  
Transcorneal Permeability

Triamcinolone acetonide (TA), an intermediate acting corticosteroid, is used in the treatment of posterior ocular diseases, such as inflammation, posterior uveitis, and diabetic macular edema. The objective of this investigation was to prepare TA-loaded solid lipid nanoparticles (TA-SLNs) and in situ gel (TA-SLN-IG) formulations for delivery into the deeper ocular tissues through the topical route. TA-SLNs were prepared by hot homogenization and ultrasonication method using glyceryl monostearate and Compritol® 888ATO as solid lipids and Tween®80 and Pluronic® F-68 as surfactants. TA-SLNs were optimized and converted to TA-SLN-IG by the inclusion of gellan gum and evaluated for their rheological properties. In vitro transcorneal permeability and in vivo ocular distribution of the TA-SLNs and TA-SLN-IG were studied using isolated rabbit corneas and New Zealand albino rabbits, respectively, and compared with TA suspension, used as control (TA-C). Particle size, PDI, zeta potential, assay, and entrapment efficiency of TA-SLNs were in the range of 200–350 nm, 0.3–0.45, −52.31 to −64.35 mV, 70–98%, and 97–99%, respectively. TA-SLN-IG with 0.3% gellan gum exhibited better rheological properties. The transcorneal permeability of TA-SLN and TA-SLN-IG was 10.2 and 9.3-folds higher compared to TA-C. TA-SLN-IG showed maximum tear concentration at 2 h, indicating an improved pre-corneal residence time, as well as higher concentrations in aqueous humor, vitreous humor and cornea at 6 h, suggesting sustained delivery of the drug into the anterior and posterior segment ocular tissues, when compared to TA-SLN and TA-C. The results, therefore, demonstrate that the lipid based nanoparticulate system combined with the in situ gelling agents can be a promising drug delivery platform for the deeper ocular tissues.

The Effect of Sulfonated Graphene on the Rheological Properties of Cement Paste

2020 ◽  
Vol 20 (12) ◽  
pp. 7495-7505
Author(s):  
Jia-Ming Wu ◽  
Guo-Jian Jing ◽  
Xiao-Lei Lu ◽  
Tian-Yu Lei ◽  
Shu-Xian Wang ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Cement Paste ◽  
Chemical Interaction ◽  
Cementitious Materials ◽  
Rheological Parameters ◽  
Physical Interaction ◽  
Mechanical And Thermal Properties ◽  
Practical Application ◽  
Sulfonated Graphene ◽  
Modified Graphene

With unique 2D nanostructures and excellent properties, graphene and its derivatives are a class of advanced nanosized reinforcements for cementitious materials. Sulfonated graphene (SG), one of the most important modified graphene materials, possesses sulfonate groups on the surface and significantly improves the mechanical and thermal properties of cement-based composites. It is important to investigate the influence of SG on cement-based materials as it is a prerequisite for practical applications. Herein, SG was prepared and introduced into cement paste to investigate its influence on the rheological properties of cement paste. With the increased addition of SG, a stable slurry was gradually obtained with low fluidity and high rheological parameters. The mechanism of the SG effect on the rheological properties of cement paste was also illustrated. Because of the high specific surface area and sulfonate groups of SG nanosheets, a large amount of flocculated structure was created by the complexing effect, chemical interaction, physical interaction and mechanical interlocking between SG and hydrated/unhydrated cement particles. Furthermore, polycarboxylate ether (PCE) superplasticizer was introduced to ensure fluidity and transportability in the practical application of SG. The results in this work lay a foundation for the practical application of modified graphene in cementitious materials.

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