The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Simon Ozbek - One of the best experts on this subject based on the ideXlab platform.
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novel manufacturing of advanced smart garments knitting with spatially varying multi material monofilament
International Symposium on Wearable Computers, 2018Co-Authors: Simon Ozbek, Md Tahmidul Islam Molla, Crystal Compton, Brad HolschuhAbstract:In this paper, we propose a novel method for knitting advanced smart garments (e.g., garments with targeted electrical or mechanical properties) using a single, spatially-varying, multi-material monofilament created using additive manufacturing (AM) techniques. By strategically varying the constitutive functional materials that comprise the monofilament along its length, it is theoretically possible to create targeted functional regions within the Knitted Structure. If spaced properly, functional regions naturally emerge in the knit as loops in adjacent rows align. To test the feasibility of this method, we evaluated the ability of a commercially available knitting machine (a Passap® E6000) to knit a variety of experimental and commercially available, spatially-variant monofilament. Candidate materials were tested both to characterize their mechanical behavior as well as to determine their ability to be successfully Knitted. A repeatable spatial mapping relationship between 1D filament location and 2D knit location was established, enabling the ability to create a variety of 2D functional pathways (straight, linear, nonlinear) in the knit Structure using a single monofilament input. Using this approach, a multi-material monofilament can be designed and manufactured to create advanced functional knits with spatially-variant properties.
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novel manufacturing of advanced smart garment knitting with spatially varying multi material monofilament
Ubiquitous Computing, 2018Co-Authors: Simon OzbekAbstract:We propose a novel method for knitting advanced smart garments (e.g., garments with targeted electrical or mechanical properties) using a single, spatially-varying, multi-material monofilament created using additive manufacturing (AM) techniques. By strategically varying the constitutive functional materials that comprise the monofilament along its length, it is theoretically possible to create targeted functional regions within the Knitted Structure. If spaced properly, functional regions naturally emerge in the knit as loops in adjacent rows align. To test the feasibility of this method, we evaluated the ability of a commercially available knitting machine (a Passap® E6000) to knit a variety of experimental and commercially available, spatially-variant monofilament. Candidate materials were tested both to characterize their mechanical behavior as well as to determine their ability to be successfully Knitted. A repeatable spatial mapping relationship between 1D filament location and 2D knit location was established, enabling the ability to create a variety of 2D functional pathways (straight, linear, nonlinear) in the knit Structure using a single monofilament input. Using this approach, a multi-material monofilament can be designed and manufactured to create advanced functional knits with spatially-variant properties.
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UbiComp/ISWC Adjunct - Novel Manufacturing of Advanced Smart Garment Knitting with Spatially-Varying, Multi-Material Monofilament
Proceedings of the 2018 ACM International Joint Conference and 2018 International Symposium on Pervasive and Ubiquitous Computing and Wearable Compute, 2018Co-Authors: Simon OzbekAbstract:We propose a novel method for knitting advanced smart garments (e.g., garments with targeted electrical or mechanical properties) using a single, spatially-varying, multi-material monofilament created using additive manufacturing (AM) techniques. By strategically varying the constitutive functional materials that comprise the monofilament along its length, it is theoretically possible to create targeted functional regions within the Knitted Structure. If spaced properly, functional regions naturally emerge in the knit as loops in adjacent rows align. To test the feasibility of this method, we evaluated the ability of a commercially available knitting machine (a Passap® E6000) to knit a variety of experimental and commercially available, spatially-variant monofilament. Candidate materials were tested both to characterize their mechanical behavior as well as to determine their ability to be successfully Knitted. A repeatable spatial mapping relationship between 1D filament location and 2D knit location was established, enabling the ability to create a variety of 2D functional pathways (straight, linear, nonlinear) in the knit Structure using a single monofilament input. Using this approach, a multi-material monofilament can be designed and manufactured to create advanced functional knits with spatially-variant properties.
Brad Holschuh - One of the best experts on this subject based on the ideXlab platform.
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novel manufacturing of advanced smart garments knitting with spatially varying multi material monofilament
International Symposium on Wearable Computers, 2018Co-Authors: Simon Ozbek, Md Tahmidul Islam Molla, Crystal Compton, Brad HolschuhAbstract:In this paper, we propose a novel method for knitting advanced smart garments (e.g., garments with targeted electrical or mechanical properties) using a single, spatially-varying, multi-material monofilament created using additive manufacturing (AM) techniques. By strategically varying the constitutive functional materials that comprise the monofilament along its length, it is theoretically possible to create targeted functional regions within the Knitted Structure. If spaced properly, functional regions naturally emerge in the knit as loops in adjacent rows align. To test the feasibility of this method, we evaluated the ability of a commercially available knitting machine (a Passap® E6000) to knit a variety of experimental and commercially available, spatially-variant monofilament. Candidate materials were tested both to characterize their mechanical behavior as well as to determine their ability to be successfully Knitted. A repeatable spatial mapping relationship between 1D filament location and 2D knit location was established, enabling the ability to create a variety of 2D functional pathways (straight, linear, nonlinear) in the knit Structure using a single monofilament input. Using this approach, a multi-material monofilament can be designed and manufactured to create advanced functional knits with spatially-variant properties.
Robert Guidoin - One of the best experts on this subject based on the ideXlab platform.
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in vitro and in vivo studies of a polyester arterial prosthesis with a warp Knitted sharkskin Structure
Journal of Biomedical Materials Research, 1997Co-Authors: Céline Mary, Tao Hong, Gaetan Laroche, Yves Marois, Martin W King, Yvan Douville, L Martin, Robert GuidoinAbstract:: The present study was undertaken to assess the performance of a new Knitted and gelatin-sealed polyester vascular graft that is believed to have greater dimensional stability than current commercial devices. Samples of the uncrimped, crimped, and sealed prosthesis were submitted to a series of in vitro and in vivo trials. Four commercial polyester Knitted devices were included as controls for the in vitro tests, which included measurements of the textile and yarn Structure and physical, chemical, and thermal properties of the graft, such as water permeability, dilatation, suture retention strength, melting point, and crystallinity index. The in vivo evaluation involved implanting the prototype device as a canine thoraco-abdominal bypass for periods ranging from 4 h to 1 year and assessing the biocompatibility, biofunctionality, and biostability of the explanted specimens. The warp-Knitted Structure of the prototype device has a unique sharkskin stitch that confers a superior dilatation resistance and suture retention strength to the prosthesis. The animal trial demonstrated that the gelatin ensures initial hemostasis without preclotting. The gelatin is bioresorbed during the first 2 weeks of implantation, which generates a temporary, moderate, acute inflammatory response. An external capsule of granulomatous tissue and an internal collagen capsule are formed between the first and third month. Analysis of the textile and physical properties of the explanted prostheses confirmed there was neither dilatation nor significant changes in Structure or mechanical performance during implantation, thus confirming the biostability of this new prototype device and opening the way for clinical trials.
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In vitro and in vivo studies of a polyester arterial prosthesis with a warp‐Knitted sharkskin Structure
Journal of Biomedical Materials Research, 1997Co-Authors: Céline Mary, Martin L, Tao Hong, Gaetan Laroche, Yves Marois, Martin W King, Yvan Douville, Robert GuidoinAbstract:The present study was undertaken to assess the performance of a new Knitted and gelatin-sealed polyester vascular graft that is believed to have greater dimensional stability than current commercial devices. Samples of the uncrimped, crimped, and sealed prosthesis were submitted to a series of in vitro and in vivo trials. Four commercial polyester Knitted devices were included as controls for the in vitro tests, which included measurements of the textile and yarn Structure and physical, chemical, and thermal properties of the graft, such as water permeability, dilatation, suture retention strength, melting point, and crystallinity index. The in vivo evaluation involved implanting the prototype device as a canine thoraco-abdominal bypass for periods ranging from 4 h to 1 year and assessing the biocompatibility, biofunctionality, and biostability of the explanted specimens. The warp-Knitted Structure of the prototype device has a unique sharkskin stitch that confers a superior dilatation resistance and suture retention strength to the prosthesis. The animal trial demonstrated that the gelatin ensures initial hemostasis without preclotting. The gelatin is bioresorbed during the first 2 weeks of implantation, which generates a temporary, moderate, acute inflammatory response. An external capsule of granulomatous tissue and an internal collagen capsule are formed between the first and third month. Analysis of the textile and physical properties of the explanted prostheses confirmed there was neither dilatation nor significant changes in Structure or mechanical performance during implantation, thus confirming the biostability of this new prototype device and opening the way for clinical trials.
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Polyester arterial prostheses recent developments from the Czech Republic and Poland
ASAIO Journal, 1997Co-Authors: Robert Guidoin, Brigitta Badour, Guillaume Laroche, Chengyu Yang, Pauline Ukpabi, Martin King, Yves Marois, Xiaoyan Deng, Ze Zhang, Louisette MartinAbstract:[To evaluate recent developments in the design and production of polyester vascular prostheses in eastern Europe, a series of in vitro physical and chemical tests and an in vivo study was performed on three new prototype devices from the Czech Republic and one from Poland. The in vitro results for these four prostheses, referred to as the Ra-1n (warp Knitted, uncrimped), Ra-1v (warp Knitted, crimped), Mikrofrote (weft Knitted, uncrimped), and Dallon (warp Knitted, crimped) prostheses, were compared against values for three commercial devices of western origin, namely the Triaxial, the Vasculour II, and the Cooley II grafts. The animal trial involved implanting the four prototype devices as a thoracoabdominal bypass in dogs for eight different periods ranging from 4 hrs to 6 months and undertaking histologic and structural investigations on the retrieved grafts. Because of its poor long-term dimensional stability in vivo, the continued use of a weft Knitted Structure, like the Mikrofrote prosthesis, is to be deprecated. Conversely, the introduction of a more dimensionally stable warp Knitted Structure in three prototypes is to be acknowledged. However, the presence of surface contaminants was most likely responsible for the excessive inflammatory reaction generated by all four prostheses during the first month in vivo, which resulted in delayed healing performance. In addition, an unusually high surface carbon-oxygen ratio suggests that the crimping process needs further refinement. Improved cleaning and packaging procedures are essential before these products can compete against existing commercial prostheses of western origin. In conclusion, these new developments illustrate that the technology of warp knitting, which is now spreading worldwide, should be evaluated., To evaluate polyester vascular prostheses, four prototype devices were implanted, in vivo, as a thoracoabdominal bypass in dogs for 4 hrs to 6 months. Histologic and structural evaluations of the grafts after retrieval revealed the weft Knitted Structured graft to be dimensionally unstable. On the other hand, the warp Knitted Structure of the other three demonstrated good stability. Inflammatory reactions were observed in all four during the first month and were attributed to surface contaminants. The unusually high carbon-oxygen ratio suggests that the crimping process needed further refinement. In vitro, similar prototypes were compared with commercial devices.]
Yingying Zhang - One of the best experts on this subject based on the ideXlab platform.
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Intrinsically Stretchable and Conductive Textile by a Scalable Process for Elastic Wearable Electronics
ACS Applied Materials and Interfaces, 2017Co-Authors: Chunya Wang, Xueqin Gong, Baolu Guan, Kailun Xia, Zhe Yin, Mingchao Zhang, Huimin Wang, Yingying ZhangAbstract:The prosperous development of stretchable electronics poses a great demand on stretchable conductive materials that could maintain their electrical conductivity under tensile strain. Previously reported strategies to obtain stretchable conductors usually involve complex Structure-fabricating processes or utilization of high-cost nanomaterials. It remains a great challenge to produce stretchable and conductive materials via a scalable and cost-effective process. Herein, a large-scalable pyrolysis strategy is developed for the fabrication of intrinsically stretchable and conductive textile in utilizing low-cost and mass-produced weft-Knitted textiles as raw materials. Due to the intrinsic stretchability of the weft-Knitted Structure and the excellent mechanical and electrical properties of the as-obtained carbonized fibers, the obtained flexible and durable textile could sustain tensile strains up to 125% while keeping a stable electrical conductivity (as shown by a Modal-based textile), thus ensuring its applications in elastic electronics. For demonstration purposes, stretchable supercapacitors and wearable thermal-therapy devices that showed stable performance with the loading of tensile strains have been fabricated. Considering the simplicity and large scalability of the process, the low-cost and mass production of the raw materials, and the superior performances of the as-obtained elastic and conductive textile, this strategy would contribute to the development and industrial production of wearable electronics.
Martin W King - One of the best experts on this subject based on the ideXlab platform.
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In vitro and in vivo studies of a polyester arterial prosthesis with a warp‐Knitted sharkskin Structure
Journal of Biomedical Materials Research, 1997Co-Authors: Céline Mary, Martin L, Tao Hong, Gaetan Laroche, Yves Marois, Martin W King, Yvan Douville, Robert GuidoinAbstract:The present study was undertaken to assess the performance of a new Knitted and gelatin-sealed polyester vascular graft that is believed to have greater dimensional stability than current commercial devices. Samples of the uncrimped, crimped, and sealed prosthesis were submitted to a series of in vitro and in vivo trials. Four commercial polyester Knitted devices were included as controls for the in vitro tests, which included measurements of the textile and yarn Structure and physical, chemical, and thermal properties of the graft, such as water permeability, dilatation, suture retention strength, melting point, and crystallinity index. The in vivo evaluation involved implanting the prototype device as a canine thoraco-abdominal bypass for periods ranging from 4 h to 1 year and assessing the biocompatibility, biofunctionality, and biostability of the explanted specimens. The warp-Knitted Structure of the prototype device has a unique sharkskin stitch that confers a superior dilatation resistance and suture retention strength to the prosthesis. The animal trial demonstrated that the gelatin ensures initial hemostasis without preclotting. The gelatin is bioresorbed during the first 2 weeks of implantation, which generates a temporary, moderate, acute inflammatory response. An external capsule of granulomatous tissue and an internal collagen capsule are formed between the first and third month. Analysis of the textile and physical properties of the explanted prostheses confirmed there was neither dilatation nor significant changes in Structure or mechanical performance during implantation, thus confirming the biostability of this new prototype device and opening the way for clinical trials.
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in vitro and in vivo studies of a polyester arterial prosthesis with a warp Knitted sharkskin Structure
Journal of Biomedical Materials Research, 1997Co-Authors: Céline Mary, Tao Hong, Gaetan Laroche, Yves Marois, Martin W King, Yvan Douville, L Martin, Robert GuidoinAbstract:: The present study was undertaken to assess the performance of a new Knitted and gelatin-sealed polyester vascular graft that is believed to have greater dimensional stability than current commercial devices. Samples of the uncrimped, crimped, and sealed prosthesis were submitted to a series of in vitro and in vivo trials. Four commercial polyester Knitted devices were included as controls for the in vitro tests, which included measurements of the textile and yarn Structure and physical, chemical, and thermal properties of the graft, such as water permeability, dilatation, suture retention strength, melting point, and crystallinity index. The in vivo evaluation involved implanting the prototype device as a canine thoraco-abdominal bypass for periods ranging from 4 h to 1 year and assessing the biocompatibility, biofunctionality, and biostability of the explanted specimens. The warp-Knitted Structure of the prototype device has a unique sharkskin stitch that confers a superior dilatation resistance and suture retention strength to the prosthesis. The animal trial demonstrated that the gelatin ensures initial hemostasis without preclotting. The gelatin is bioresorbed during the first 2 weeks of implantation, which generates a temporary, moderate, acute inflammatory response. An external capsule of granulomatous tissue and an internal collagen capsule are formed between the first and third month. Analysis of the textile and physical properties of the explanted prostheses confirmed there was neither dilatation nor significant changes in Structure or mechanical performance during implantation, thus confirming the biostability of this new prototype device and opening the way for clinical trials.
