Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Purified sodium montmorillonite (SWy-2) gels of a few percent solids displayed pronounced time-dependent rheological or aging behavior with a long time scale. The aging behavior was characterized by an increasing yield stress with rest time. This increase continued even after a week of rest. An open sponge-like cellular microstructure of the aged gels was captured by cryo-SEM with samples prepared at high pressure. The size of the openings of the cellular structure is small, generally less than 1 μm formed by thin flexible platelet with curling edges. This structure was formed by strong attractive and repulsive forces. The rapid yield stress increase in the early stage of aging is due to rapid bond formation occurring between network platelets and free individual platelet, isolated aggregates, and platelet particles in network with free edges. Over time, all platelets are bonded in the network. During aging, the platelets in the structure would have to adjust continually in response to a net force acting on it by its neighbors. The high concentration of platelets responding to this force imbalance is the cause of the long aging time scale. The operation of the attractive and repulsive forces, and the shape and charge properties of the platelets are responsible for the cellular structure being built. At complete structural recovery, the structure should attain the state of lowest free energy. The repulsive force regulates the development of the microstructure. The aging data of the 3.3 wt % gel were fitted by different aging models.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.langmuir.8b00213 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Dissecting the Large Stokes Shift Fluorescence of Graphene-Sheet-Based Carbon Dots by Excitation-Dependent Ultrafast Spectroscopy.
J Phys Chem Lett
September 2025
Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, United States.
Carbon dots (CDs) represent a new class of nontoxic and sustainable nanomaterials with increasing applications. Among them, bright and large Stokes-shift CDs are highly desirable for display and imaging, yet the emission mechanisms remain unclear. We obtained structural signatures for the recently engineered green and red CDs by ground-state femtosecond stimulated Raman spectroscopy (FSRS), then synthesized orange CDs with similar size but much higher nitrogen dopants than red CDs.
View Article and Find Full Text PDFUltrasonographic assessment of bypass capacity after revascularization surgery in moyamoya disease: a systematic review and single-arm meta-analysis.
Acta Neurochir (Wien)
September 2025
Department of Neurosurgery, Medical University of Gdańsk, Gdańsk, Poland.
Purpose: Moyamoya disease (MMD) is a chronic cerebrovascular disorder characterized by progressive arterial stenosis and fragile collateral formation, elevating stroke risk. Revascularization is the standard treatment, yet up to 27% of patients experience ischemic events within a year due to bypass insufficiency. While digital subtraction angiography (DSA) remains the gold standard for assessing bypass function, it is invasive and time-consuming.
View Article and Find Full Text PDFComparison of intraoperative and postoperative outcomes between open and robotic-assisted kidney transplantation: a meta-analysis and systematic review.
J Robot Surg
September 2025
Department of Urology/School of Clinical Medicine, North Sichuan Medical College/Affiliated Hospital of North Sichuan Medical College, No. 1, South Maoyuan Road, Shunqing District, Nanchong City, 63700, Sichuan Province, China.
Renal transplantation is the best option for end-stage renal disease, and in this study, patients who underwent robotic-assisted renal transplantation (RAKT) and open renal transplantation (OKT) were selected to compare their intraoperative and postoperative clinical outcomes: including Operation Time, Length of Stay, WIT (warm ischaemia time), CIT (cold ischaemia time), Estimated Blood Loss, Post 1 month Creatinine, Incision Length, Rewarming Time, Wound infection. The study was registered in PROSPERO with CRD code: CRD420251061084. We searched in Web of Science, Pubmed, Wiely, Elsevier databases, screened according to inclusion and exclusion criteria and finally included 7 papers.
View Article and Find Full Text PDFUse of progestin-only drospirenone-based pills in hyperandrogenic women with polycystic ovary syndrome.
Arch Gynecol Obstet
September 2025
Department of Women's and Children's Health Sciences and Public Health, Fondazione Policlinico Universitario A. Gemelli, IRCCS, L.Go Agostino Gemelli, 8, 00168, Rome, Italy.
Purpose: Polycystic ovarian syndrome (PCOS) is a common endocrine-metabolic disorder affecting about 10% of reproductive-age women. Characterized by hyperandrogenism and ovulatory dysfunction, PCOS often involves metabolic features due to insulin resistance. Traditional treatment with combined oral contraceptive pills (COCP) effectively manages hyperandrogenism and menstrual irregularities.
View Article and Find Full Text PDFCortical Structure Abnormalities in Patients With Noise-Induced Hearing Loss: A Surface-Based Morphometry Study.
Brain Behav
September 2025
Radiology Department, Yantaishan Hospital, Yantai, Shandong, China.
Objective: To investigate the characteristics of brain structures in patients with noise-induced hearing loss (NIHL) using source-based morphometry (SBM) and to evaluate the correlation between abnormal brain regions and clinical data.
Methods: High-resolution 3D T1 structural images were acquired from 81 patients with NIHL and 74 age- and education level-matched healthy controls (HCs). The clinical data of all subjects were collected, including noise exposure time, monaural hearing threshold weighted values (MTWVs), Mini-Mental State Examination (MMSE), and Hamilton Anxiety Scale (HAMA) scores.