Relevant bibliographies by topics / Polydispersity index

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Academic literature on the topic 'Polydispersity index'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Polydispersity index"

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Štěpánek, Petr, Zdeněk Tuzar, and Čestmír Koňák. "Evaluation of polydispersity index Mw/Mn by quasielastic light scattering." Collection of Czechoslovak Chemical Communications 52, no. 5 (1987): 1235–45. http://dx.doi.org/10.1135/cccc19871235.

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The response of quasielastic light scattering to the polydispersity of scattering objects has been investigated. A new method of the polydispersity index determination has been suggested, suitable for the range 1.02 ⪬ Mw/Mn ⪬ 2.0 and consisting in the measurement of the dependence of the apparent decay time on the correlator sampling time. The polydispersity index can be determined by comparing these dependences with the theoretical ones obtained using correlation curves simulated for various values of the polydispersity index, assuming lognormal and Schulz-Zimm distributions of molecular weig
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Ouyang, Xin Ping, Pan Zhang, Chun Mei Tan, Yong Hong Deng, Dong Jie Yang, and Xue Qing Qiu. "Isolation of lignosulfonate with low polydispersity index." Chinese Chemical Letters 21, no. 12 (2010): 1479–81. http://dx.doi.org/10.1016/j.cclet.2010.06.032.

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Jakeš, Jaromír. "A simple method of estimation of the polydispersity index of narrow molecular weight distributions by using quasielastic light scattering data." Collection of Czechoslovak Chemical Communications 56, no. 8 (1991): 1642–52. http://dx.doi.org/10.1135/cccc19911642.

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A simple method of estimation of the polydispersity index of narrow molecular weight distributions using quasielastic light scattering data has been suggested. The method approximates the relaxation times distribution by using the Pearson V distribution and iterates its parameters by the least squares method to an experimental correlation function. For the usual unimodal molecular weight distributions the polydispersity index estimate is good (with an error up to 0.1) at a determined value up to 1.2, rough at a determined value up to 1.5, while above this value the method is virtually impracti
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Rogošić, M., H. J. Mencer, and Z. Gomzi. "Polydispersity index and molecular weight distributions of polymers." European Polymer Journal 32, no. 11 (1996): 1337–44. http://dx.doi.org/10.1016/s0014-3057(96)00091-2.

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Viéville, Justine, Matthieu Tanty, and Marc-André Delsuc. "Polydispersity index of polymers revealed by DOSY NMR." Journal of Magnetic Resonance 212, no. 1 (2011): 169–73. http://dx.doi.org/10.1016/j.jmr.2011.06.020.

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Fayza BAGHLI, Djawad CHIKH, and Nassima MOUSSAOUI-KHEDAM. "Box–Behnken design for the development of fluconazole-loaded classical ethosomes." GSC Biological and Pharmaceutical Sciences 28, no. 3 (2024): 057–70. http://dx.doi.org/10.30574/gscbps.2024.28.3.0316.

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Introduction: Ethosomes are soft and flexible vesicles mainly composed of phospholipids, ethanol and water. The presence of a high amount of ethanol ensure deeper drug penetration; however, an optimal formulation is necessary. This study aims to develop and characterize Fluconazole loaded classical ethosomes using Box-Behken design, in order to achieve to an optimal formulation having a minimal vesicle size, low polydispersity index, high zeta potential and good entrapment efficiency (% EE). Methods: Fluconazole ethosomes were prepared using cold method and tested for vesicle size, polydispers
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Fayza, BAGHLI, CHIKH Djawad, and MOUSSAOUI-KHEDAM Nassima. "Box–Behnken design for the development of fluconazole-loaded classical ethosomes." GSC Biological and Pharmaceutical Sciences 28, no. 3 (2024): 057–70. https://doi.org/10.5281/zenodo.14709166.

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<strong>Introduction:&nbsp;</strong>Ethosomes are soft and flexible vesicles mainly composed of phospholipids, ethanol and water. The presence of a high amount of ethanol ensure deeper drug penetration; however, an optimal formulation is necessary. This study aims to develop and characterize Fluconazole loaded classical ethosomes using Box-Behken design, in order to achieve to an optimal formulation having a minimal vesicle size, low polydispersity index, high zeta potential and good entrapment efficiency (% EE). <strong>Methods:&nbsp;</strong>Fluconazole ethosomes were prepared using cold met
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Wadhi, Maria Nuari Putri, Ilham Kuncahyo, and Ismi Rahmawati. "Optimization of Self Nanoemulsifying Drug Delivery System of Mature Green Betel Leaf Fraction with D-Optimal Method and Antifungal Activity of Candida albicans." Formosa Journal of Multidisciplinary Research 4, no. 2 (2025): 881–98. https://doi.org/10.55927/fjmr.v4i2.79.

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The purpose of the study was to see the most active fraction in providing activity, the influence and optimal proportion of oleic acid, tween 80, and propylene glycol on characterization and the optimal formula that has increased activity. The Fractionation Process uses water, ethyl acetate, and n-hexane as solvents. Activity tests use concentration variations of 0.4%, 0.8%, 1.6%. SNEDDS formulation uses 15% -20% oleic acid, 55% -60% tween 80, and 20% -25% propylene glycol and is tested for characterization and optimization using D-optimal. The optimum formula was tested for antifungal activit
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Şimşek, Barış, Gözde Ultav, Haluk Korucu, and Ahmet Yartaşı. "Improvement of the Graphene Oxide Dispersion Properties with the Use of TOPSIS Based Taguchi Application." Periodica Polytechnica Chemical Engineering 62, no. 3 (2018): 323–35. http://dx.doi.org/10.3311/ppch.11412.

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The stability of the graphene oxide dispersions is an important issue in the preparation of medicine, printed flexible electronics, 3D printers and conductive inks. In order to improve the stability; mean and standard deviation of particle size, polydispersity index, zeta potential and conductivity of graphene oxide dispersion were selected as the main stability properties. The improvement rate between the estimate and the optimal conditions were calculated for the mean and standard deviation of particle size, polydispersity index, zeta potential and conductivity as 264.0%, 1875.0%, 583.3%, 5.
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Betala, Surendranath, M. Mohan Varma, and K. Abbulu. "Formulation and evaluation of polymeric nanoparticles of an antihypetensive drug for gastroretention." Journal of Drug Delivery and Therapeutics 8, no. 6 (2018): 82–86. http://dx.doi.org/10.22270/jddt.v8i6.2018.

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The aim of present study was to formulate and evaluate nanoparticles of carvedilol by using different hydrophilic polymers. Carvedilol was selected as a suitable drug for gastro- retentive nanoparticles due to its short half life, low bioavailability, high frequency of administration, and narrow absorption window in stomach and upper part of GIT. The nano-precipitation method was used to prepare nanoparticles so as to avoid both chlorinated solvents and surfactants to prevent their toxic effect on the body. Nanoparticles of carvedilol were prepared by using hydrophilic polymers such as HPMC K1
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Dissertations / Theses on the topic "Polydispersity index"

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Chen, Wan-Chun, and 陳婉君. "Effect of Sequence Distribution and Polydispersity Index on the Hydrogen Bonds Strength of Poly(vinylphenol-co-methyl methacrylate) Copolymers." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/86894690045409817799.

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碩士<br>國立交通大學<br>應用化學系所<br>93<br>A series of poly(vinylphenol-co-methyl methacrylate) block and random copolymers were prepared by anionic、free radical and atom transfer radical polymerizations of 4-tert-butoxystyrene、4-acetoxystyrene and methyl methacrylate, followed by selective removal of the 4-tert-butoxystyrene and the 4-acetoxystyrene protective group by hydrolysis reaction, respectively. Infrared spectra provide positive evidence that the random copolymer has higher fraction of hydrogen bonded carbonyl group and larger inter-association equilibrium constant with similar vinylphenol conte
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Book chapters on the topic "Polydispersity index"

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Gooch, Jan W. "Polydispersity Index." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9034.

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"Polydispersity index." In Encyclopedic Dictionary of Polymers. Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_8886.

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Stepanek, Petr, Zdenek Tuzar, and Cestmir Konak. "DETERMINATION OF POLYDISPERSITY INDEX BY QUASIELASTIC LIGHT SCATTERING." In Physical optics of dynamic phenomena and processes in macromolecular systems. De Gruyter, 1985. http://dx.doi.org/10.1515/9783111517667-056.

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ZIMMERMANN, RAFAELA, DAIKELLY IGLESIAS BRAGHIROLLI, and PATRICIA PRANKE. "DEVELOPMENT OF NANOCAPSULES FOR THE TREATMENT OF SPINAL CORD INJURY." In Proceedings of the 2nd International Digital Congress on 3D Biofabrication and Bioprinting (3DBB) - Biofabrication, Bioprinting, Additive Manufacturing applied to health. Editora Realize, 2022. http://dx.doi.org/10.46943/ii.3dbb.2022.01.013.

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INTRODUCTION: SPINAL CORD INJURY (SCI) IS A SERIOUS DISEASE YET THERE IS NO TRULY SUCCESSFUL TREATMENT. IN THIS WORK, DIFFERENT OILS HAVE BEEN USED IN THE PREPARATION OF NANOCAPSULES (NCS), TO ENCAPSULATE THE NICOTINE FOR THE TREATMENT OF SCI AND COMPARE IT IN TERMS OF DIAMETER, POLYDISPERSITY INDEX (PDI), ZETA POTENTIAL, AND ENCAPSULATION EFFICIENCY (EE). METHODOLOGY: NCS WERE PREPARED USING POLY (LACTIC-CO-GLYCOLIC ACID) (PLGA) THROUGH THE TECHNIQUE OF INTERFACIAL POLYMER DEPOSITION. IN GROUP I, GRAPE SEED OIL WAS USED, IN GROUP II CASTOR OIL, IN GROUP III COPAIBA OIL, AND IN GROUP IV A?A? O
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Wang, Xinyan, Hui Wei, Liang Fan, Xinde Tang, and Yuxia Gao. "Influence of Asphalt Aging on Cohesive Performance and Molecular Weight Distribution: Based on Tack Test and GPC Analysis." In Advances in Transdisciplinary Engineering. IOS Press, 2025. https://doi.org/10.3233/atde250214.

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Asphalt aging severely weakens the durability of pavement. However, the cross-scale mechanism linking molecular evolution to the deterioration of cohesive performance remains unclear. This study aims to elucidate how aging alters the cohesive behavior and molecular structure of asphalt, thereby connecting macro-scale performance with changes at the molecular level. The cohesive parameters (cohesive factor Ct, maximum tensile strength) were quantified through Tack Test, while the molecular weight distribution (weight-average molecular weight Mw, polydispersity index PDI) of asphalt at different
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Mohanto, Sourav, Mohammed Gulzar Ahmed, Adrija Bhunia, and Mithun Bhowmick. "Development of RP-HPLC-PDA Method Validation for the Simultaneous Estimation of Zidovudine, Lamivudine, and Nevirapine in Bulk and Dosage Forms and in Dissolution Samples." In Current Trends in Drug Discovery, Development and Delivery (CTD4-2022). Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781837671090-00493.

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Cinnarizine belongs to the Class II of Biopharmaceutical classification system, and its absorption from the gastrointestinal tract can be limited by various factors, with the most significant contributors being poor aqueous solubility and membrane permeability of the drug molecule, which further affects the oral bioavaibility. Bio nanocomposite is the process of complex formation between drug and polymers/excipients where microwave energy plays a significant role in reducing the particle size of materials. It breaks intermolecular bonding, which further reduces the particle size, enhanced the
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M.Clegg, S., M. J.Snowden, P. A.Williams, and I. D.Robb. "Effect of non-adsorbing polymer on dispersion stability." In Gums and stabilisers for the Food industry 6. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780199632848.003.0049.

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Abstract This paper describes work carried out on the behaviour of model silica particles dispersed in water containing non-adsorbing (carboxymethyl cellulose and polystyrene sulphonate) polymers. The pair potentials of the particles have been calculated using current quantitative models of depletion flocculation and DLVO theory, with the depth of the secondary minima in the energy curves being used as an index for the onset of flocculation. The depletion flocculation of the particles by polystyrene sulphonate shows excellent agreement between theory and experimental observations, but this was
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Arruda, Ray Ravilly Alves, Ulrich Vasconcelos, Rafael de Almeida Travassos, Tarcísio Tárcio Corrêa Bonifácio, Valdir de Andrade Braga, and Elisângela Afonso de Moura Kretzschmar. "Preparation and characterization of nanocapsules containing 2-nitrate and 1,3-diisobutoxypropane (NDIBP) nanocapsules and NDIBP/cyclodextrin inclusion complexes." In Multidisciplinary Perspectives: Integrating Knowledge. Seven Editora, 2024. http://dx.doi.org/10.56238/sevened2024.007-054.

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2-nitrate-1,3-diisobutoxypropane (NDIBP) is a synthetic organic nitrate derived from glycerin, with low solubility in water. The objective of this work was to prepare and characterize inclusion complexes and nanocapsules with NDIBP. The inclusion complexes were prepared by lyophilization and the nanocapsules by the preformed polymer interfacial deposition method. The solubility isotherms determined for NDIBP showed Al-type profiles (K1:1 = 33.0 M-1). The formation of the inclusion complex provided a 12.5-fold increase in the solubility of NDIBP. The inclusion complexes showed changes in crysta
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"Self-assembling styrylpyridinium compounds forming liposome nanoparticles for near-infrared photodynamic therapy." In Book of Abstracts - RAD 2025 Conference. RAD Centre, Niš, Serbia, 2025. https://doi.org/10.21175/rad.abstr.book.2025.47.11.

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Introduction: Cancer remains a leading cause of death worldwide. Although chemotherapy is widely used, it often causes severe side effects that force patients to stop treatment. To address this challenge, there is a need for precisely targeted therapies that can effectively destroy cancer cells while maintaining minimal toxicity to healthy tissues. Promising alternative is Photodynamic therapy (PDT) where light-activated compounds are used to generate reactive oxygen species (ROS) at the irradiation site triggering cancer cell apoptosis. This localized activation results in minimal systemic to
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Conference papers on the topic "Polydispersity index"

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Serra, Christophe, Nicolas Sary, and Guy Schlatter. "Numerical Simulations of Macromolecular Syntheses in Micro-Mixers: Towards a Better Control of the Polymerization." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75044.

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This paper investigates the modeling of styrene free radical polymerization in two different types of micro-mixer for which the wall temperature is kept constant. The simulations are performed with the help of the finite elements method which allows solving simultaneously partial differential equations resulting from the hydrodynamics, thermal and mass transfer (convection, diffusion and chemical reaction). The different micro-mixers modeled are on one hand an interdigital multilamination micro-mixer with a large focusing section and on the other hand a simple T-junction with three different r
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Esmaeilzadeh, Hamed, George Cernigliaro, Junwei Su, et al. "The Effects of Material Properties on Pillar-Based QCM Sensors." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52533.

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Quartz crystal microbalance (QCM) device is a highly sensitive mass sensor (sensitivity: 0.5 ng/cm2) with a wide range of applications including biosensing, thin film deposition, surface chemistry, volatile organic compounds (VOC) and gaseous analytes detection. A recent study shows that several orders of magnitude improvement in sensitivity can be achieved by attaching microscale Polymethyl methacrylate (PMMA) pillars onto the surface of the QCM (QCM-P) to form a two-degree of freedom coupled resonant system. In this research, the effects of residual layer from the nanoimprinting process of m
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Karkad, A., Milena Milošević, Miroslav Novaković, Aleksandar Marinković, and Aleksandra Jovanović. "MULTILAMELLAR LIPOSOMES AS A CARRIER FOR Cotinus coggygria Scop. EXTRACT." In 8th Workshop Food and Drug Safety and Qualit. Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, 2024. http://dx.doi.org/10.46793/8fdsq.pa4ak.

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In the present paper, Cotinus coggygria ethanol extract-loaded liposomes were formulated to provide better stability and bioavailability of smoke tree biologically active compounds, as well as their prolonged release. The encapsulation efficiency (EE), size, polydispersity index (PDI), zeta potential, and mobility of the prepared liposomal particles with extract were investigated. The EE of extract in liposomes was 96.05±0.06%. The particle size and PDI values were 2888.7±219.9 nm and 0.273±0.089, respectively. The zeta potential was -27.7±0.5 mV, while the mobility was -2.172 µmcm/Vs. Future
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Dekanski, Dragana, Aleksandar Raskovic, Nikola Martić, Andrea Pirkovic, and Aleksandra Jovanović. "DESIGN AND EVALUATION OF LIPOSOMAL FORMULATION OF CAROB (Ceratonia siliqua L.) PULP EXTRACT." In 8th Workshop Food and Drug Safety and Quality. Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, 2024. http://dx.doi.org/10.46793/8fdsq.pa2dd.

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The carob (Cerationa siliqua L.) pulp flour is used primarily in the food industry. As a valuable source of bioactive compounds (polyphenols), it is a good candidate for pharmaceutical formulation research and development. In this study, carob pulp extract-loaded liposomal particles were developed using the proliposome procedure and characterized via encapsulation efficiency (EE), vesicle size, polydispersity index (PDI), zeta potential, mobility, and viscosity. The obtained results suggest that the EE is high (80.6±3.3%). The particle size and PDI results indicated the existence of the multil
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Usta, Aybala, Muhammad Rahman, and Ramazan Asmatulu. "Synthesis, Stability and Selection Study of Oil-in-Water Nanoemulsions Containing Nigella Sativa L. Essential Oil." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72205.

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Targeted drug delivery has a great importance in cancer treatment and is in interest of many scientists worldwide. Targeted drug delivery renders local treatment of cancerous cells possible without affecting healthy cells. Hydrogels are promising materials to be used in targeted drug delivery systems due to their biocompatible nature and injectable behaviors where they can be used to load drugs. However, considering that not all the drugs are water soluble, entrapment of some drugs into hydrogels is not practical in terms of poor drug solubility and burst drug release because of this. At this
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Danso, D. K., Jozef Bicerano, Douglas P. Heller, and R. G. Barati. "Development of Polyelectrolyte Complex Nanoparticles for Direct Lithium Extraction from Oilfield Brines." In SPE Energy Transition Symposium. SPE, 2024. http://dx.doi.org/10.2118/221397-ms.

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Abstract This paper details the formulation and characterization of a novel nanoparticle system composed of polyethyleneimine (PEI) and dextran sulfate (DS) for direct lithium extraction (DLE) from bulk oilfield brines sourced from North America. Different mass ratios of solutions of PEI and DS at varied concentrations (1 -10wt%) were prepared in the presence of 150 ppm Li concentration to yield nanoparticle systems that electrostatically entrap the Li ions in the solution. The nanoparticles produced were characterized by their size, zeta potential (charge), polydispersity index, and count rat
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OGUNDELE, OPEOLUWA, Oluwafemi OGUNDELE, and Oluwatosin Ijabadeniyi. "Effect of optimised infrared heat treatment on composition structure and gelation properties of cowpea protein isolate." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/aewh5407.

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Infrared radiation heating is a heat pre-treatment method that employs infrared electromagnetic radiation to generate heat in pulses such as cowpea for the production of instantized ingredients and products. Optimum processing conditions, moisture content of 45%, the heating temperature of 185 „ƒ, and time of 5 min was reported to precooked cowpea from previous studies. Modified protein isolates are suitable for industrial use due to their improved functionality. In this study, the effect of optimised conditions (45% moisture, the heating temperature of 185 „ƒ, and heating time of 5 min) on th
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Zheng, Ying, and Wilson S. Meng. "Polycation Coated Polymeric Particles as Vehicles of RNA Delivery Into Immune Cells." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3714.

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The purpose of this work is to develop a carrier system for delivering RNA molecules aimed to downregulate specific functions in T cells. In many forms of cancer, T cells that express the protein Forkhead Box P3 (Foxp3) are associated with cancer progression. These cells can be identified by CD4 and CD25, molecules express on the cell surface. Studies have shown that downregulation of Foxp3 can increase the ability of other immune cells to destroy tumors. A class of RNA molecules, commonly referred to as “siRNA”, bind to and degrade specific messenger RNA (mRNA) in a sequence-dependent manner
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