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https://www.readbyqxmd.com/read/29677140/flow-channel-influence-of-a-collision-based-piezoelectric-jetting-dispenser-on-jet-performance
#1
Can Zhou, Guiling Deng, Junhui Li, Ji'an Duan
To improve the jet performance of a bi-piezoelectric jet dispenser, mathematical and simulation models were established according to the operating principle. In order to improve the accuracy and reliability of the simulation calculation, a viscosity model of the fluid was fitted to a fifth-order function with shear rate based on rheological test data, and the needle displacement model was fitted to a nine-order function with time based on real-time displacement test data. The results show that jet performance is related to the diameter of the nozzle outlet and the cone angle of the nozzle, and the impacts of the flow channel structure were confirmed...
April 20, 2018: Sensors
https://www.readbyqxmd.com/read/29676980/effect-of-bleaching-gel-viscosity-on-tooth-whitening-efficacy-and-pulp-chamber-penetration-an-in-vitro-study
#2
S R Kwon, Fnu Pallavi, Y Shi, U Oyoyo, A Mohraz, Y Li
OBJECTIVES: Whitening efficacy has been related to hydrogen peroxide (HP) diffusion into tooth structure. However, little information is available relating rheological properties to whitening efficacy. The purpose was to evaluate the whitening efficacy and HP penetration level of a 10% HP gel at three different viscosities and to compare them to a strip delivery system. METHODS AND MATERIALS: Extracted molars (n=120) were randomly assigned into five groups (n=24/ group): NC_MED (negative control; median): medium viscosity gel without HP; LOW: 10% HP gel (low viscosity experimental gel, Ultradent Products Inc); MED: 10% HP gel (medium viscosity experimental gel, Ultradent); HIGH: 10% HP gel (high viscosity gel, Ultradent); and CWS: Crest 3D Whitestrips 1-Hour Express (Procter & Gamble)...
May 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29676140/-effect-of-shenqi-dihuang-decoction-on-inflammatory-factor-renal-function-and-microcirculation-in-patients-with-early-diabetic-nephropathy
#3
Ming-Rui Wang, Li-Hua Yu, Ting-Ting Wang, Ye-Mei Wang, Ming-Xiang Han
To study the effect of Shenqi Dihuang decoction on inflammatory factor, renal function and microcirculation in patients with early diabetic nephropathy. A total of 205 cases of patient with early diabetic nephropathy treated in our hospital from March 2014 to April 2016 were selected and divided into two groups according to the admitted order, with 103 cases in clinical group and 102 in control group. Patients in control group were treated with melbine and captopril, which may be adjusted according to the clinical symptom...
March 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29675528/well-dispersed-cellulose-nanocrystals-in-hydrophobic-polymers-by-in-situ-polymerization-for-synthesizing-highly-reinforced-bio-nanocomposites
#4
Shiyu Geng, Jiayuan Wei, Yvonne Aitomäki, Maxime Noël, Kristiina Oksman
In nanocomposites, dispersing hydrophilic nanomaterials in a hydrophobic matrix using simple and environmentally friendly methods remains challenging. Herein, we report a method based on in situ polymerization to synthesize nanocomposites of well-dispersed cellulose nanocrystals (CNCs) and poly(vinyl acetate) (PVAc). We have also shown that by blending this PVAc/CNC nanocomposite with poly(lactic acid) (PLA), a good dispersion of the CNCs can be reached in PLA. The outstanding dispersion of CNCs in both PVAc and PLA/PVAc matrices was shown by different microscopy techniques and was further supported by the mechanical and rheological properties of the composites...
April 20, 2018: Nanoscale
https://www.readbyqxmd.com/read/29673957/carboxymethyl-fenugreek-gum-rheological-characterization-and-as-a-novel-binder-for-silicon-anode-of-lithium-ion-batteries
#5
Liewei Qiu, Yiding Shen, Huabo Fan, Xiaowu Yang, Chen Wang
The rheology of carboxymethyl fenugreek gum (CFG) is characterized and applied it as a binder for the silicon anode of lithium-ion batteries (LIBs). First, a series of carboxymethyl fenugreek gum (namely CFG-1, CFG-2 and CFG-3) was prepared and characterized by Fourier transform infrared spectrophotometer and hydrogen nuclear magnetic resonance spectrometry studies. In rheological measurements, the CFG solutions show higher flowability, weaker viscoelastic behavior and better thixotropy than that of fenugreek gum (FG) solution...
April 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29673936/comparison-between-a-generalized-newtonian-model-and-a-network-type-multiscale-model-for-hemodynamic-behavior-in-the-aortic-arch-validation-with-4d-mri-data-for-a-case-study
#6
Marine Menut, Loïc Boussel, Xavier Escriva, Benyebka Bou-Saïd, Hélène Walter-Le Berre, Yann Marchesse, Antoine Millon, Nellie Della Schiava, Patrick Lermusiaux, John Tichy
Blood is a complex fluid in which the presence of the various constituents leads to significant changes in its rheological properties. Thus, an appropriate non-Newtonian model is advisable; and we choose a Modified version of the rheological model of Phan-Thien and Tanner (MPTT). The different parameters of this model, derived from the rheology of polymers, allow characterization of the non-Newtonian nature of blood, taking into account the behavior of red blood cells in plasma. Using the MPTT model that we implemented in the open access software OpenFOAM, numerical simulations have been performed on blood flow in the thoracic aorta for a healthy patient...
March 29, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29673709/evaluation-of-the-filler-packing-structures-in-dental-resin-composites-from-theory-to-practice
#7
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVES: The aim of this study is to evaluate the packing properties of uniform silica particles and their mixture with secondary particles yielding maximally loaded dental composites. We intend to verify the difference between the idealized models (the close-packed structures and the random-packed structures) and the actual experimental results, in order to provide guidance for the preparation of dental composites. The influence of secondary particle size and the resin composition on the physical-mechanical properties and the rheological properties of the experimental dental composites was also investigated...
April 16, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29673153/pectin-from-citrus-canning-wastewater-as-potential-fat-replacer-in-ice-cream
#8
Hua Zhang, Jianle Chen, Junhui Li, Chaoyang Wei, Xingqian Ye, John Shi, Shiguo Chen
Pectin had been recovered from canning wastewater produced by chemical treatment of segment membrane during preparation of canned citrus in our previous research. The purpose of this study was to characterize the extracted pectin from canning wastewater, and to evaluate its application as a fat alternative to replace fat in ice cream. The monosaccharide composition and rheological properties of the pectin were determined. The influences of fat reduction and pectin addition on the physicochemical, rheological and sensory properties of low-fat ice cream were determined...
April 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29673143/injection-molding-and-mechanical-properties-of-bio-based-polymer-nanocomposites
#9
Maria Chiara Mistretta, Luigi Botta, Marco Morreale, Sebastiano Rifici, Manuela Ceraulo, Francesco Paolo La Mantia
The use of biodegradable/bio-based polymers is of great importance in addressing several issues related to environmental protection, public health, and new, stricter legislation. Yet some applications require improved properties (such as barrier or mechanical properties), suggesting the use of nanosized fillers in order to obtain bio-based polymer nanocomposites. In this work, bionanocomposites based on two different biodegradable polymers (coming from the Bioflex and MaterBi families) and two different nanosized fillers (organo-modified clay and hydrophobic-coated precipitated calcium carbonate) were prepared and compared with traditional nanocomposites with high-density polyethylene (HDPE) as matrix...
April 17, 2018: Materials
https://www.readbyqxmd.com/read/29672958/various-phase-behaviors-and-rich-aggregates-in-a-catanionic-system-dominated-by-an-anionic-surfactant-containing-a-large-rigid-group
#10
Zhai Zhaolan, Yan Xinyan, Ji Xu, Song Zhanqian, Shang Shibin, Xiaoping Rao
The phase behaviors and aggregates in a catanionic system have been investigated. The anionic surfactants in the mixed systems are sodium N-alkyl-maleimidepimaric carboxylate (Cn-MPA-Na, n=12, 14, 16), which are prepared from rosin and contain a large rigid skeleton and a flexible alkane chain. And the cationic surfactant is cetyltrimethylammonium bromide (CTAB). The phase behavior of C14-MPA-Na/CTAB system transforms form a viscoelastic solution to an aqueous surfactant two-phase system (ASTP), an aqueous surfactant three-phase system (AS3P) and an anisotropic homogeneous phase in sequence when C14-MPA-Na concentration continuously increases from 10 to 35 mM...
April 19, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29670845/chemical-rheological-and-nutritional-characteristics-of-sesame-and-olive-oils-blended-with-linseed-oil
#11
Fataneh Hashempour-Baltork, Mohammadali Torbati, Sodeif Azadmard-Damirchi, Geoffrey Peter Savage
Purpose: Nutritional quality and oxidation stability are two main factors in the evaluation of edible oils. Oils in their pure form do not have an ideal fatty acid composition or suitable oxidative stability during processing or storage. Methods: This study was designed to evaluate the chemical, nutritional and rheological properties of oil mixtures in three ratios of olive: sesame: linseed, 65:30:5; 60:30:10 and 55:30:15. Acidity value, peroxide value, rancimat test, fatty acid profile, nutritional indexes and rheological properties of the oil blends were determined...
March 2018: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29670336/transethosomal-gels-as-carriers-for-the-transdermal-delivery-of-colchicine-statistical-optimization-characterization-and-ex-vivo-evaluation
#12
Ibrahim M Abdulbaqi, Yusrida Darwis, Reem Abou Assi, Nurzalina Abdul Karim Khan
Introduction: Colchicine is used for the treatment of gout, pseudo-gout, familial Mediterranean fever, and many other illnesses. Its oral administration is associated with poor bioavailability and severe gastrointestinal side effects. The drug is also known to have a low therapeutic index. Thus to overcome these drawbacks, the transdermal delivery of colchicine was investigated using transethosomal gels as potential carriers. Methods: Colchicine-loaded transethosomes (TEs) were prepared by the cold method and statistically optimized using three sets of 24 factorial design experiments...
2018: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/29670246/slow-slip-events-in-semi-brittle-serpentinite-fault-zones
#13
A Goswami, S Barbot
Slow-slip events are earthquake-like events only with much lower slip rates. While peak coseismic velocities can reach tens of meters per second, slow-slip is on the order of 10-7±2 m/s and may last for days to weeks. Under the rate-and-state model of fault friction, slow-slip is produced only when the asperity size is commensurate with the critical nucleation size, a function of frictional properties. However, it is unlikely that all subduction zones embody the same frictional properties. In addition to friction, plastic flow of antigorite-rich serpentinite may significantly influence the dynamics of fault slip near the mantle wedge corner...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29670033/standard-reference-materials-for-cement-paste-part-i-suggestion-of-constituent-materials-based-on-rheological-analysis
#14
Dong Kyu Lee, Myoung Sung Choi
The purpose of this study was to develop a standard reference material that can simulate the flow characteristics of cement paste. For this purpose, it is important to determine the constituent materials of the standard material for cement paste. Generally, cement paste is a mixture of cement and water. To determine the constituent material of cement paste, it was divided into powder that can replace cement and matrix fluid. With the concept of rheology, which can evaluate the flow properties of selected materials quantitatively under certain mixing conditions, experiments were carried out step-by-step according to material composition combination, stage of aging, and material types...
April 18, 2018: Materials
https://www.readbyqxmd.com/read/29669437/development-of-hydrogels-oleogels-and-bigels-as-local-drug-delivery-systems-for-periodontitis
#15
Rania Hamed, Ala'a AbuRezeq, Ola Tarawneh
Periodontal disease is a chronic inflammation of gum and tissues that surround and support the teeth. Nonsteroidal anti-inflammatory drugs (NSAIDs) can be used in the treatment of periodontitis to ease swelling and inflammation. One approach of treating periodontitis is loading the NSAIDs in local drug delivery systems. Therefore, the objective of this study was to investigate the local delivery of the NSAIDs model drug ibuprofen to treat periodontitis using different types of gel formulations (hydrogel, oleogel, and bigel)...
April 19, 2018: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29667686/rheological-characterization-of-dynamic-remodeling-of-the-pericellular-region-by-human-mesenchymal-stem-cell-secreted-enzymes-in-well-defined-synthetic-hydrogel-scaffolds
#16
Maryam Daviran, Sarah M Longwill, Jonah F Casella, Kelly M Schultz
Human mesenchymal stem cells (hMSCs) dynamically remodel their microenvironment during basic processes, such as migration and differentiation. Migration requires extracellular matrix invasion, necessitating dynamic cell-material interactions. Understanding these interactions is critical to advancing materials designs that harness and manipulate these processes for applications including wound healing and tissue regeneration. In this work, we encapsulate hMSCs in a cell-degradable poly(ethylene glycol)-peptide hydrogel to determine how cell-secreted enzymes, specifically matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs), create unique pericellular microenvironments...
April 18, 2018: Soft Matter
https://www.readbyqxmd.com/read/29666528/effect-of-pregelatination-on-rheology-cooking-and-antioxidant-activity-of-pasta
#17
Aasima Rafiq, Savita Sharma, Baljit Singh
The present study explores the possibility of using twin screw extruder for preparation of pregelatinized pasta. The effects of extrusion parameters feed moisture (28 and 32%), barrel temperature (60-105 °C) and screw speed (100-200 rpm) on pregelatinized pasta were investigated. Prepared pasta was analysed for quality characteristics in terms of cooking quality, degree of gelatinization, color, texture, pasting properties, bioactive composition. Results indicated that higher screw speed improved the cooking quality of pasta and decreased gruel solid loss...
May 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29666519/effect-of-composition-and-storage-time-on-some-physico-chemical-and-rheological-properties-of-probiotic-soy-cheese-spread
#18
Saroj Kumar Giri, Manoj Kumar Tripathi, Nachiket Kotwaliwale
Probiotic soy-cheese spread was prepared by fermenting soymilk with specific probiotic starter culture, and there after processing the coagulated mass. Soy cheese spread samples had more than 109  cfu/g of viable probiotic count at the time of preparation; and had around 17.6% protein, 25.3% fat and 19.8% total soluble sugar. Compared to commercially available dairy cheese spread, probiotic soy cheese spread had significantly higher protein and anti-oxidant activity. Soy cheese spreads, prepared from pure soymilk as well as by mixing with dairy milk, were studied with respect to the differences in their rheological behavior during storage at refrigerated conditions...
May 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29666517/effect-of-culture-levels-ultrafiltered-retentate-addition-total-solid-levels-and-heat-treatments-on-quality-improvement-of-buffalo-milk-plain-set-yoghurt
#19
Vijesh Yadav, Vijay Kumar Gupta, Ganga Sahay Meena
Studied the effect of culture (2, 2.5 and 3%), ultrafiltered (UF) retentate addition (0, 11, 18%), total milk solids (13, 13.50, 14%) and heat treatments (80 and 85 °C/30 min) on the change in pH and titratable acidity (TA), sensory scores and rheological parameters of yoghurt. With 3% culture levels, the required TA (0.90% LA) was achieved in minimum 6 h incubation. With an increase in UF retentate addition, there was observed a highly significant decrease in overall acceptability, body and texture and colour and appearance scores, but there was highly significant increase in rheological parameters of yoghurt samples...
May 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29665386/enzymatically-crosslinked-and-mechanically-tunable-silk-fibroin-pullulan-hydrogels-for-mesenchymal-stem-cells-delivery
#20
Tao Li, Xiongbo Song, Changmei Weng, Xin Wang, Jiangyi Wu, Li Sun, Xiaoyuan Gong, Wei-Nan Zeng, Liu Yang, Cheng Chen
Hydrogels with good biocompatibility, proper degradation rates, and tissue-matched elasticity are widely used in tissue engineering, regenerative medicine, and drug delivery. In this study, enzymatically crosslinked biocompatible hydrogels were successfully developed using silk fibroin (SF) and pullulan (PL) under physiological conditions in the presence of both horseradish peroxidase (HRP) and hydrogen peroxide (H2 O2 ). A series of properties of the hydrogels including gelation time, equilibrium swelling, enzyme degradation, morphology, rheological property, and compression modulus of SF/PL hydrogels were studied by varying the concentration of PL...
April 14, 2018: International Journal of Biological Macromolecules
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