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"de Vries" liquid crystals, defined by a maximum layer shrinkage of ≤1% from the smectic A to C phase transition, are an integral component of ferroelectric liquid crystal (FLC) displays. Bona fide de Vries materials described in the literature are primarily perfluorinated, polysiloxane and polysilane-terminated rod-like (or calamitic) LCs. Herein, for the first time, we report a series of newly designed achiral unsymmetrical bent-core molecules with terminal alkoxy chains exhibiting similar properties to "de Vries" LCs. The new molecular structure is based on the systematic distribution of four phenyl rings attached ester and imine linkers having 3-amino-2-methylbenzoic acid as the central core with a bent angle of 147°. Detailed microscopic investigations in differently aligned (planar as well as homeotropic) cells along with SAXS/WAXS studies revealed that the materials exhibited a SmA-SmC phase sequence along with the appearance of the nematic phase at higher temperatures. SAXS measurements divulged the layer spacings (-spacings) and hence, the layer shrinkage was calculated ranging from 0.19% to 0.68% just below the SmA-SmC transition. The variation of the calculated molecular tilt angle () derived from the temperature-dependent SAXS data, followed the power law with exponent values 0.29 ± 0.01 and 0.25 ± 0.01 for compounds 1/10 and 1/12, respectively. The experimental values obtained were very close to the theoretically predicted values for the materials with de Vries-like properties. The analysis of temperature-dependent birefringence studies based on the prediction of the Landau theory, showed a dip across the SmA-SmC phase transition typical of compounds exhibiting the de Vries characteristics. The collective results obtained suggest "de Vries" SmA as a probable model for this bent-core system which may find applications in displays.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8864698 | PMC |
http://dx.doi.org/10.1039/d1sc06629c | DOI Listing |
Front Psychiatry
December 2024
Department of Anatomy and Neurosciences, Amsterdam University Medical Center, Amsterdam, Netherlands.
Introduction: Improved effectiveness and treatment adherence is needed in smoking cessation (SC) therapies. Another important challenge is to disrupt maladaptive drug-related memories. To achieve these goals, we developed a novel treatment strategy on the basis of motion-assisted memory desensitization and reprocessing (3MDR).
View Article and Find Full Text PDFJ Infect Dis
December 2024
Amsterdam UMC, location Vrije Universiteit Amsterdam, Department of Pathology, Boelelaan 1117, Amsterdam, The Netherlands.
Introduction: High-resolution anoscopy (HRA) to prevent anal cancer is complex and screening capacity is limited. Previously, we showed that DNA methylation analysis of anal high-grade squamous intraepithelial lesions (HSIL) biopsies can distinguish between HSIL with an increased cancer risk, and HSIL with a low cancer risk, in which treatment may be safely withheld. Here, we assessed the performance of methylation analysis in anal swabs to identify patients with underlying HSIL with an increased cancer risk.
View Article and Find Full Text PDFInt J Nurs Stud Adv
December 2024
Department of Anesthesiology, Intensive Care and Pain management, St. Antonius Hospital Nieuwegein, Nieuwegein, The Netherlands.
Background: An early warning scoring system aims to detect clinical deterioration at an early stage and prevent failure-to-rescue in hospitalized patients. In this systematic review we studied the effect of an early warning scoring system on adverse outcome in surgical patients.
Methods: This review was conducted and reported according to PRISMA and the protocol of this review is registered at PROSPERO, under the registration number CRD42018107799.
Europace
December 2024
Laboratory of Experimental Cardiology, Department of Cardiology, Leiden University Medical Center, 2333 ZA Leiden, the Netherlands.
In 2024, we celebrate the 100th anniversary of Willem Einthoven receiving the Nobel Prize for his discovery of the mechanism of the electrocardiogram. Building on Einthoven's legacy, electrocardiography allows the monitoring of cardiac bioelectricity through solutions to the so-called forward and inverse problems. These solutions link local cardiac electrical signals with the morphology of the electrocardiogram, offering a reversible connection between the heart's electrical activity and its representation on the body surface.
View Article and Find Full Text PDFBMC Med Ethics
December 2024
Center of Expertise on Gender Dysphoria (CEGD), Amsterdam UMC, Vrije Universiteit, De Boelelaan 1118, Amsterdam, 1081 HZ, The Netherlands.
Background: The scrutiny surrounding gender-affirming medical treatment (GAMT) for youth has increased, particularly concerning the limited evidence on long-term treatment outcomes. The Standards of Care 8 by the World Professional Association for Transgender Health addresses this by outlining research evidence suggesting "effective" outcomes of GAMT for adolescents. However, claims concerning what are considered "effective" outcomes of GAMT for adolescents remain implicit, requiring further reflection.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!