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Journal articles on the topic 'Particulate leaching technique'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Dong, Y. S., C. Guo, Ping Hua Lin, L. H. Yin, and Yong Ping Pu. "Preparation of Porous Poly (L-Lactic Acid) (PLLA) Scaffold by Porogen Leaching and Freeze Drying." Key Engineering Materials 288-289 (June 2005): 381–84. http://dx.doi.org/10.4028/www.scientific.net/kem.288-289.381.

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The poly (L-lactic acid) (PLLA) porous scaffolds were prepared by porogen leaching combined freeze drying with the porogen particulates of ice in this paper. The ice particulates are made of distilled water sprayed into liquid nitrogen through a nozzle under a certain pressure. The pore morphology, porosity and residual porogen of the scaffolds was studied. There is no residual porogen when the ice particulate is used and the leaching mechanism of porogen is discussed. The scaffolds are composed of macro and micro pores and with a porosity of 80-90%. The macro pores are formed by ice particula

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2

Wulkersdorfer, B., K. K. Kao, V. G. Agopian, et al. "Bimodal Porous Scaffolds by Sequential Electrospinning of Poly(glycolic acid) with Sucrose Particles." International Journal of Polymer Science 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/436178.

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Electrospinning is a method to produce fine, biopolymer mesh with a three-dimensional architecture that mimics native extra-cellular matrix. Due to the small fiber diameter created in this process, conventional electrospun scaffolds have pore sizes smaller than the diameter of most cells. These scaffolds have limited application in tissue engineering due to poor cell penetration. We developed a hybrid electrospinning/particulate leaching technique to create scaffolds with increased porosity and improved cellular ingrowth. Poly(glycolic acid) (PGA) and a sucrose-ethanol suspension were electros

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3

Iannace, Salvatore, Ernesto Di Maio, and Luigi Nicolais. "Preparation and Characterization of Polyurethane Porous Membranes by Particulate-leaching Method." Cellular Polymers 20, no. 5 (2001): 321–38. http://dx.doi.org/10.1177/026248930102000502.

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Highly porous polyurethane foams were prepared by the particulate-leaching technique, using NaCl as water-soluble solid phase. Melt compounding and compression moulding were used to prepare polymer/salt composite samples. Foams with controlled porosity, surface/volume ratio and pore dimension distribution were therefore obtained after dissolution of salt in distilled water. Dissolution kinetic was evaluated and modelled as a function of filler composition and its size distribution. Kinetic increased by rising salt concentration and by reducing its average size. Mechanical properties of the foa

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4

Lin, Wenhai, Qin Li, and Tianrong Zhu. "Study of solvent casting/particulate leaching technique membranes in pervaporation for dehydration of caprolactam." Journal of Industrial and Engineering Chemistry 18, no. 3 (2012): 941–47. http://dx.doi.org/10.1016/j.jiec.2011.09.007.

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5

Selvam, Shivaram, Wenji V. Chang, Tamako Nakamura, et al. "Microporous Poly(L-Lactic Acid) Membranes Fabricated by Polyethylene Glycol Solvent-Cast/Particulate Leaching Technique." Tissue Engineering Part C: Methods 15, no. 3 (2009): 463–74. http://dx.doi.org/10.1089/ten.tec.2008.0431.

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6

Suh, Soo Won, Ji Youn Shin, Jinhoon Kim, et al. "Effect of Different Particles on Cell Proliferation in Polymer Scaffolds Using a Solvent-Casting and Particulate Leaching Technique." ASAIO Journal 48, no. 5 (2002): 460–64. http://dx.doi.org/10.1097/00002480-200209000-00003.

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7

Ong, Chia Chia, Intan Syazana Suhaimin, Syamimi Abu Kassim, Syazana Ahmad Zubir, and Tuti Katrina Abdullah. "Effect of Modified Solvent Casting/Particulate Leaching (SCPL) Technique on the Properties of Bioactive Glass Reinforced Polyurethane Scaffold for Biomedical Applications." Journal of Physical Science 30, Supp.2 (2019): 115–26. http://dx.doi.org/10.21315/jps2019.30.s2.10.

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8

Huang, Ran, Xiaomin Zhu, Haiyan Tu, and Ajun Wan. "The crystallization behavior of porous poly(lactic acid) prepared by modified solvent casting/particulate leaching technique for potential use of tissue engineering scaffold." Materials Letters 136 (December 2014): 126–29. http://dx.doi.org/10.1016/j.matlet.2014.08.044.

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9

Grottkau, Brian E., Zhixin Hui, Yang Yao, and Yonggang Pang. "Rapid Fabrication of Anatomically-Shaped Bone Scaffolds Using Indirect 3D Printing and Perfusion Techniques." International Journal of Molecular Sciences 21, no. 1 (2020): 315. http://dx.doi.org/10.3390/ijms21010315.

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Fused deposit modeling (FDM) 3D printing technology cannot generate scaffolds with high porosity while maintaining good integrity, anatomical-surface detail, or high surface area-to-volume ratio (S/V). Solvent casting and particulate leaching (SCPL) technique generates scaffolds with high porosity and high S/V. However, it is challenging to generate complex-shaped scaffolds; and solvent, particle and residual water removal are time consuming. Here we report techniques surmounting these problems, successfully generating a highly porous scaffold with the anatomical-shape characteristics of a hum

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10

Steele, James H. "The Preparation of Porous Materials Using Liquid Metal Impregnation for BSE Characterization with a Scanning Electron Microscope." Microscopy Today 18, no. 3 (2010): 36–42. http://dx.doi.org/10.1017/s1551929510000398.

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The infiltration of porous and particulate materials for metallographic examination with low-melting alloys was first described by Rose and DeRoos . The use of Wood's metal to fill porosity in sandstone was reported by Craze , by Dullien , and by Yadev et al. . Changes in pore structure and phase dispersions in iron ore pellets after simulated blast furnace reduction were reported by Shultz et al. , wherein liquid Bi-Sn impregnation was used to prepare cross sections of deformed and reduced pellets for backscatter electron imaging. Steele and Engel also applied the technique to examine the mic

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11

Zhang, Yanbo, Ruiyan Li, Wenzheng Wu, et al. "Adhesion and Proliferation of Osteoblast-Like Cells on Porous Polyetherimide Scaffolds." BioMed Research International 2018 (November 27, 2018): 1–7. http://dx.doi.org/10.1155/2018/1491028.

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The purpose of this work was to investigate the porous polyetherimide scaffold (P-PEIs) as an alternative biopolymer for bone tissue engineering. The P-PEIs was fabricated via solvent casting and particulate leaching technique. The morphology, phase composition, roughness, hydrophilicity, and biocompatibility of P-PEIs were evaluated and compared with polyetherimide (PEI) and Ti6Al4V disks. P-PEIs showed a biomimetic porous structure with a modulus of 78.95 ± 2.30 MPa. The water contact angle of P-PEIs was 75.4 ± 3.39°, which suggested that P-PEIs had a wettability surface. Moreover, P-PEIs pr

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12

Kang, Yun Qing, Guang Fu Yin, Lin Luo, Ke Feng Wang, and Yu Zhang. "Effects of Mechanical Stress on the In Vitro Degradation of Porous Composite Scaffold for Bone Tissue Engineering." Key Engineering Materials 342-343 (July 2007): 273–76. http://dx.doi.org/10.4028/www.scientific.net/kem.342-343.273.

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In bone tissue engineering, porous scaffolds served as the temporary matrix are often subjected to mechanical stress when implanted in the body. Based on this fact, the goal of this study was to examine the effects of mechanical loading on the in vitro degradation characteristics and kinetics of porous scaffolds in a custom-designed loading system. Porous Poly(L-lactic acid)/β-Tricalcium Phosphate (PLLA/β-TCP) composite scaffolds fabricated by using solution casting/compression molding/particulate leaching technique (SCP) were subjected to degradation in simulated body fluid (SBF) at 37°C for

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13

Wake, M. Conley, Puneet K. Gupta, and Antonios G. Mikos. "Fabrication of Pliable Biodegradable Polymer foams to Engineer Soft Tissues." Cell Transplantation 5, no. 4 (1996): 465–73. http://dx.doi.org/10.1177/096368979600500405.

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We have fabricated pliable, porous, biodegradable scaffolds with poly(lactic-co-glycolic acid) (PLGA) and poly(ethylene glycol) (PEG) blends using a solvent-casting and particulate-leaching technique. Our study investigated the effects of four different processing parameters on pliability and pore morphology of the biodegradable scaffolds. The parameters investigated were the PLGA copolymer ratio, the PLGA/PEG blend ratio, the initial salt weight fraction, and the salt particle size. A wide range of shear moduli (0.59 to 9.55 MPa), porosities (0.798 to 0.942), and median pore diameters (71 to

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14

Esmail, Asiyah, João R. Pereira, Chantal Sevrin, et al. "Preparation and Characterization of Porous Scaffolds Based on Poly(3-hydroxybutyrate) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)." Life 11, no. 9 (2021): 935. http://dx.doi.org/10.3390/life11090935.

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Poly(hydroxyalkanoates) (PHAs) with different material properties, namely, the homopolymer poly(3-hydroxybutyrate), P(3HB), and the copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate, P(3HB-co-3HV), with a 3HV of 25 wt.%, were used for the preparation of porous biopolymeric scaffolds. Solvent casting with particulate leaching (SCPL) and emulsion templating were evaluated to process these biopolymers in porous scaffolds. SCPL scaffolds were highly hydrophilic (>170% swelling in water) but fragile, probably due to the increase of the polymer’s polydispersity index and its high porosity (&g

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15

Normahira, Mamat, Razali Khairul Raimi, Fazli Mohd Nashrul Nasir, Abd Razak Norazian, and Hashim Adilah. "Biomimetic Porosity of Gelatin-Hydroxyapatite Scaffold for Bone Tissue." Advanced Materials Research 970 (June 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.970.3.

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Biomimetic Porosity of Gelatin/hydroxyapatite (HA) scaffold was fabricated by using solvent casting method and particulate leaching technique. The composite solution were prepared by adding fixed weight percentages of HA (30wt%) with different concentration a gelatin solution (0.25wt%, 0.30wt%, 0.35wt%, 0.40wt% and 0.50wt%) . Five different composites polymers were poured into a mold with size of 15mm x 15mm x 10mm cube and dried in the oven dryer under 60°C to 90°C. After that, the dry composite scaffolds were immersed in the 8% of glutaraldehyde (GA) solution in a few minute for crosslinking

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16

Kaufmann, P. M., S. Heimrath, B. S. Kim, and D. J. Moone. "Highly Porous Polymer Matrices as a Three-Dimensional Culture System for Hepatocytes." Cell Transplantation 6, no. 5 (1997): 463–68. http://dx.doi.org/10.1177/096368979700600505.

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Hepatocyte-based therapies (e.g., hepatocyte transplantation and extracorporeal support devices) may provide alternative therapies to treat patients with liver disease, but suitable approaches to localize these cells to a given location while maintaining liver-specific gene expression must be developed. The suitability of highly porous three-dimensional sponges fabricated from poly (l-lactic acid) [PLLA] as an hepatocyte culture system was evaluated in this study. Sponges were fabricated utilizing a particulate leaching technique, and were approximately 95% porous, with an average pore diamete

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17

Thadavirul, Napapaphat, Prasit Pavasant, and Pitt Supaphol. "Development of polycaprolactone porous scaffolds by combining solvent casting, particulate leaching, and polymer leaching techniques for bone tissue engineering." Journal of Biomedical Materials Research Part A 102, no. 10 (2013): 3379–92. http://dx.doi.org/10.1002/jbm.a.35010.

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18

Suh, S. W., J. G. Kim, and H. J. Kim. "EFFECT OF DIFFERENT PARTICLES ON CELL PROLIFERATION IN POLYMER SCAFFOLDS MADE USING SOLVENT-CASTING AND PARTICULATE LEACHLNG TECHNIQUE." ASAIO Journal 47, no. 2 (2001): 179. http://dx.doi.org/10.1097/00002480-200103000-00312.

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19

Konstantinova, Natalia, James Hein, Amy Gartman, et al. "Mineral Phase-Element Associations Based on Sequential Leaching of Ferromanganese Crusts, Amerasia Basin Arctic Ocean." Minerals 8, no. 10 (2018): 460. http://dx.doi.org/10.3390/min8100460.

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Ferromanganese (FeMn) crusts from Mendeleev Ridge, Chukchi Borderland, and Alpha Ridge, in the Amerasia Basin, Arctic Ocean, are similar based on morphology and chemical composition. The crusts are characterized by a two- to four-layered stratigraphy. The chemical composition of the Arctic crusts differs significantly from hydrogenetic crusts from elsewhere of global ocean by high mean Fe/Mn ratios, high As, Li, V, Sc, and Th concentrations, and high detrital contents. Here, we present element distributions through crust stratigraphic sections and element phase association using several comple

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20

Farè, Silvia, Luigi de Nardo, S. De Cicco, M. Jovenitti, and Maria Cristina Tanzi. "Different Processing Methods to Obtain Porous Structure in Shape Memory Polymers." Materials Science Forum 539-543 (March 2007): 663–68. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.663.

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In the last few years, clinical procedures undergone huge modifications. Among them, mini-invasive surgery has modified the clinical practice and the quality of life of patients. Shape Memory Polymers (SMPs), a class of stimuli-responsive materials, can be considered ideal candidates for the design of devices for mini-invasive surgical procedures. Such a device can be inserted in a packed in, temporary shape and later can expand at body temperature. A bone defect could be filled by a SMP porous structure, that improves the tissue integration and healing. In this work, two different processing

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21

Boulton, AJ, and PI Boon. "A review of methodology used to measure leaf litter decomposition in lotic environments: Time to turn over an old leaf?" Marine and Freshwater Research 42, no. 1 (1991): 1. http://dx.doi.org/10.1071/mf9910001.

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Despite the recognition of the relationship between microbial conditioning and invertebrate feeding, there has been little communication between microbial ecologists and zoologists studying the processing of leaf litter in streams. An appraisal of suitable methods is timely, to encourage workers to critically examine their experimental approach: it is often forgotten that results are determined largely by the methods used. We review some recent studies, emphasizing the application of microbiological and biochemical methods, and discuss some important decisions that must be made in experimental

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22

Cardoso, Guinea BC, Erivelto Chacon, Priscila GL Chacon, et al. "Fatty acid is a potential agent for bone tissue induction: In vitro and in vivo approach." Experimental Biology and Medicine 242, no. 18 (2017): 1765–71. http://dx.doi.org/10.1177/1535370217731104.

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Our hypothesis was to investigate the fatty acid potential as a bone induction factor. In vitro and in vivo studies were performed to evaluate this approach. Oleic acid was used in a 0.5 wt.% concentration. Polycaprolactone was used as the polymeric matrix by combining solvent-casting and particulate-leaching techniques, with a final porosity of 70 wt.%, investigated by SEM images. Contact angle measurements were produced to investigate the influence of oleic acid on polycaprolactone chains. Cell culture was performed using adipocyte-derived stem cells to evaluate biocompatibility and bioactiv

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23

Clyne, Alisa Morss. "Thermal Processing of Tissue Engineering Scaffolds." Journal of Heat Transfer 133, no. 3 (2010). http://dx.doi.org/10.1115/1.4002464.

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Tissue engineering requires complex three-dimensional scaffolds that mimic natural extracellular matrix function. A wide variety of techniques have been developed to create both fibrous and porous scaffolds out of polymers, ceramics, metals, and composite materials. Existing techniques include fiber bonding, electrospinning, emulsion freeze drying, solvent casting/particulate leaching, gas foaming/particulate leaching, high pressure processing, and thermally induced phase separation. Critical scaffold properties, including pore size, porosity, pore interconnectivity, and mechanical integrity,

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24

Mooney, D. J., K. Sano, P. M. Kaufmann, K. McNamara, J. P. Vacanti, and R. Langer. "Integrating Cell Transplantation and Controlled Drug Delivery Technologies to Engineer Liver Tissue." MRS Proceedings 385 (1995). http://dx.doi.org/10.1557/proc-385-43.

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ABSTRACTEngineering liver tissue using hepatocyte transplantation may provide a new approach for treating a variety of liver diseases. However, techniques to transplant hepatocytes and promote their survival must be developed. We have developed systems to transplant hepatocytes on highly porous (95%), biodegradable sponges, and to regulate the survival of cultured hepatocytes by releasing specific growth factors in the cellular environment. Sponges were fabricated from poly (L, lactic acid) (PLLA) and polyvinyl alcohol using a particulate leaching technique. Epidermal growth factor and insulin

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25

Mooney, D. J., K. Sanog, P. M. Kaufmann, K. Mcnamara, J. P. Vacanti, and R. Langer. "Integrating cell Transplantation and Controlled Drug Delivery Technologies to Engineer Liver Tissue." MRS Proceedings 394 (1995). http://dx.doi.org/10.1557/proc-394-105.

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AbstractEngineering liver tissue using hepatocyte transplantation may provide a new approach for treating a variety of liver diseases. However, techniques to transplant hepatocytes and promote their survival must be developed. We have developed systems to transplant hepatocytes on highly porous (95%), biodegradable sponges, and to regulate the survival of cultured hepatocytes by releasing specific growth factors in the cellular environment. Sponges were fabricated from poly (L, lactic acid) (PLLA) and polyvinyl alcohol using a particulate leaching technique. Epidermal growth factor and insulin

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26

Mikos, Antonios G., Heidi L. Wald, Georgios Sarakinos, Susan M. Leite, and Robert Langer. "Biodegradable Cell Transplantation Devices for Tissue Regeneration." MRS Proceedings 252 (1991). http://dx.doi.org/10.1557/proc-252-353.

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ABSTRACTBiodegradable polymers can be utilized as templates for cell transplantation and regeneration of metabolic organs and structural tissues. Candidate materials must be adhesive substrates for cells, promote cell growth and allow for retention of cell function. However, the processing requirements of such materials into highly porous three-dimensional structures with large surface per volume and an interconnecting pore network limits their potential application for tissue regeneration. A new processing technique was developed to produce uniform, three-dimensional cell transplantation devi

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27

Motloung, Mpho Phillip, Simphiwe Zungu, Vincent Ojijo, Jayita Bandyopadhyay, and Suprakas Sinha Ray. "Morphological, thermal, and thermomechanical properties of cellulose nanocrystals reinforced polylactide/poly [(butylene succinate)-co-adipate] blend composite foams." Functional Composite Materials 1, no. 1 (2020). http://dx.doi.org/10.1186/s42252-020-00011-z.

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Abstract This study examines the influence of cellulose nanocrystal (CN) particles on the morphological, thermal, and thermo-mechanical properties of polylactide (PLA)/poly [(butylene succinate)-co-adipate] (PBSA) blend foams prepared by casting and particulate leaching method using fructose as porogen particles. The morphological analysis showed an interconnected open-cell structure, with porosity above 80%. The crystallinity of the prepared foams was disrupted by the inclusion of CN particles as observed from XRD analyses, which showed a decrease in PLA crystal peak intensity. With regards t

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28

Murugan, Sivasankar, and Sreenivasa Rao Parcha. "Fabrication techniques involved in developing the composite scaffolds PCL/HA nanoparticles for bone tissue engineering applications." Journal of Materials Science: Materials in Medicine 32, no. 8 (2021). http://dx.doi.org/10.1007/s10856-021-06564-0.

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AbstractA fine-tuned combination of scaffolds, biomolecules, and mesenchymal stem cells (MSCs) is used in tissue engineering to restore the function of injured bone tissue and overcome the complications associated with its regeneration. For two decades, biomaterials have attracted much interest in mimicking the native extracellular matrix of bone tissue. To this aim, several approaches based on biomaterials combined with MSCs have been amply investigated. Recently, hydroxyapatite (HA) nanoparticles have been incorporated with polycaprolactone (PCL) matrix as a suitable substitute for bone tiss

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29

Kumar, Lokesh, and Susanta Kumar Jana. "Advances in absorbents and techniques used in wet and dry FGD: a critical review." Reviews in Chemical Engineering, March 1, 2021. http://dx.doi.org/10.1515/revce-2020-0029.

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Abstract Sulfur dioxide is considered as an extremely harmful and toxic substance among the air pollutants emitted from the lignite- and other high-sulfur-coal based power plants, old tires processing units, smelters, and many other process industries. Various types of absorbents and desulfurization technologies have been developed and adopted by the industries to reduce the emission rate of SO2 gas. The present paper focuses on the ongoing advances in the development of varieties of regenerative and non-regenerative absorbents viz., Ca-based, Mg-based, Fe-based, Na-based, N2-based, and others

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30

Zubairi, Saiful Irwan, Athanasios Mantalaris, Alexander Bismarck, and Syazwan Aizad. "POLYHYDROXYALKANOATES (PHAs) FOR TISSUE ENGINEERING APPLICATIONS: BIOTRANSFORMATION OF PALM OIL MILL EFFLUENT (POME) TO VALUE-ADDED POLYMERS." Jurnal Teknologi 78, no. 1 (2015). http://dx.doi.org/10.11113/jt.v78.4042.

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The study of cancer cell has been hindered by the lack of appropriate ex vivo models, which can mimic this microenvironment. It is hypothesized that the fabrication of porous 3-D scaffolds for the biomimetics growth of cancer cells ex vivo could facilitate the study of the disease in its native 3-D niche. For that reason, biomaterials are used for fabrication of 3-D scaffold, in general, may be natural polymers such as proteins, collagens and gelatin, or synthetic biopolymers. Among the various available biodegradable polymers, polyhydroxyalkanoates (PHAs) have gained significant interest as o

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