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https://www.readbyqxmd.com/read/27918636/4d-printing-of-shape-memory-based-personalized-endoluminal-medical-devices
#1
Matt Zarek, Nicola Mansour, Shir Shapira, Daniel Cohn
The convergence of additive manufacturing and shape-morphing materials is promising for the advancement of personalized medical devices. The capability to transform 3D objects from one shape to another, right off the print bed, is known as 4D printing. Shape memory thermosets can be tailored to have a range of thermomechanical properties favorable to medical devices, but processing them is a challenge because they are insoluble and do not flow at any temperature. This study presents here a strategy to capitalize on a series of medical imaging modalities to construct a printable shape memory endoluminal device, exemplified by a tracheal stent...
December 5, 2016: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/27906403/printable-ink-lenses-diffusers-and-2d-gratings
#2
Rajib Ahmed, Ali K Yetisen, Anthony El Khoury, Haider Butt
Advances in holography have led to applications including data storage, displays, security labels, and colorimetric sensors. However, existing top-down approaches for the fabrication of holographic devices are complex, expensive, and expertise dependent, limiting their use in practical applications. Here, ink-based holographic devices have been created for a wide range of applications in diffraction optics. A single pulse of a 3.5 ns Nd:YAG laser allowed selective ablation of ink to nanofabricate planar optical devices...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27822516/cual-id-globally-unique-correctable-and-human-friendly-sample-identifiers-for-comparative-omics-studies
#3
John H Chase, Evan Bolyen, Jai Ram Rideout, J Gregory Caporaso
The number of samples in high-throughput comparative "omics" studies is increasing rapidly due to declining experimental costs. To keep sample data and metadata manageable and to ensure the integrity of scientific results as the scale of these projects continues to increase, it is essential that we transition to better-designed sample identifiers. Ideally, sample identifiers should be globally unique across projects, project teams, and institutions; short (to facilitate manual transcription); correctable with respect to common types of transcription errors; opaque, meaning that they do not contain information about the samples; and compatible with existing standards...
January 2016: MSystems
https://www.readbyqxmd.com/read/27802016/temperature-dependent-performance-of-printed-field-effect-transistors-with-solid-polymer-electrolyte-gating
#4
Falk von Seggern, Inna Keskin, Erin Koos, Robert Kruk, Horst Hahn, Subho Dasgupta
Printable, physical and air-stable composite solid polymer electrolytes (CSPEs) with high ionic conductivity have been established as a suitable alternative to standard dielectric gate insulators for printed field-effect transistors (FETs) and logics. We have performed a stress and temperature stability study involving several CSPEs. Mechanical tensile and shear tests have been performed to determine physical condition of CSPEs. A comprehensive temperature dependent study has been conducted within the working temperature range which electric double layer (EDL) capacitors or CSPE gated FETs may typically experience during their lifetime...
November 1, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27779379/3d-printing-of-ultratough-polyion-complex-hydrogels
#5
Fengbo Zhu, Libo Cheng, Jun Yin, Zi Liang Wu, Jin Qian, Jianzhong Fu, Qiang Zheng
Polyion complex (PIC) hydrogels have been proposed as promising engineered soft materials due to their high toughness and good processability. In this work, we reported manufacturing of complex structures with tough PIC hydrogels based on three-dimensional (3D) printing technology. The strategy relies on the distinct strength of ionic bonding in PIC hydrogels at different stages of printing. In concentrated saline solution, PIC forms viscous solution, which can be directly extruded out of a nozzle into water, where dialyzing out of salt and counterions results in sol-gel transition to form tough physical PIC gel with intricate structures...
November 1, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27749641/developing-and-testing-an-electronic-literacy-resource-for-arab-patients-before-experiencing-radiology-procedures
#6
Mohamed M Abuzaid, Aishah M Alnuaimi, Asma M Abdi, Elika A Mohajer, Ifrah A Mohamed, Rawan A Bilwani, Shaima B Alhammadi
BACKGROUND: Radiological examinations require prior preparation that patients should be informed about. Radiologists and radiologic technologists have limited time and resources to do so. Therefore, the internet is a valuable and accessible resource for patient education, but the information may not be reliable, especially that in Arabic language. This study aimed to develop online patient education resources about imaging procedures in Arabic. It also evaluated the understandability and actionability of the source materials...
September 2016: Journal of the Egyptian Public Health Association
https://www.readbyqxmd.com/read/27708034/high-quality-graphene-via-microwave-reduction-of-solution-exfoliated-graphene-oxide
#7
Damien Voiry, Jieun Yang, Jacob Kupferberg, Raymond Fullon, Calvin Lee, Hu Young Jeong, Hyeon Suk Shin, Manish Chhowalla
Efficient exfoliation of graphite in solutions to obtain high-quality graphene flakes is desirable for printable electronics, catalysis, energy storage, and composites. Graphite oxide with large lateral dimensions has an exfoliation yield of ~100%, but it has not been possible to completely remove the oxygen functional groups so that the reduced form of graphene oxide (GO; reduced form: rGO) remains a highly disordered material. Here we report a simple, rapid method to reduce GO into pristine graphene using 1- to 2-second pulses of microwaves...
September 23, 2016: Science
https://www.readbyqxmd.com/read/27704769/mechanically-tunable-readily-processable-ion-gels-by-self-assembly-of-block-copolymers-in-ionic-liquids
#8
Timothy P Lodge, Takeshi Ueki
Room temperature ionic liquids are of great interest for many advanced applications, due to the combination of attractive physical properties with essentially unlimited tunability of chemical structure. High chemical and thermal stability, favorable ionic conductivity, and complete nonvolatility are just some of the most important physical characteristics that make ionic liquids promising candidates for emerging technologies. Examples include separation membranes, actuators, polymer gel electrolytes, supercapacitors, ion batteries, fuel cell membranes, sensors, printable plastic electronics, and flexible displays...
October 5, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27658612/bioink-properties-before-during-and-after-3d-bioprinting
#9
Katja Hölzl, Shengmao Lin, Liesbeth Tytgat, Sandra Van Vlierberghe, Linxia Gu, Aleksandr Ovsianikov
Bioprinting is a process based on additive manufacturing from materials containing living cells. These materials, often referred to as bioink, are based on cytocompatible hydrogel precursor formulations, which gel in a manner compatible with different bioprinting approaches. The bioink properties before, during and after gelation are essential for its printability, comprising such features as achievable structural resolution, shape fidelity and cell survival. However, it is the final properties of the matured bioprinted tissue construct that are crucial for the end application...
2016: Biofabrication
https://www.readbyqxmd.com/read/27649121/special-issue-biomaterials-and-bioprinting
#10
EDITORIAL
Chee Kai Chua, Wai Yee Yeong, Jia An
The emergence of bioprinting in recent years represents a marvellous advancement in 3D printing technology. It expands the range of 3D printable materials from the world of non-living materials into the world of living materials. Biomaterials play an important role in this paradigm shift. This Special Issue focuses on biomaterials and bioprinting and contains eight articles covering a number of recent topics in this emerging area.
September 14, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27594210/an-investigation-into-the-use-of-polymer-blends-to-improve-the-printability-of-and-regulate-drug-release-from-pharmaceutical-solid-dispersions-prepared-via-fused-deposition-modeling-fdm-3d-printing
#11
Muqdad Alhijjaj, Peter Belton, Sheng Qi
FDM 3D printing has been recently attracted increasing research efforts towards the production of personalized solid oral formulations. However, commercially available FDM printers are extremely limited with regards to the materials that can be processed to few types of thermoplastic polymers, which often may not be pharmaceutically approved materials nor ideal for optimizing dosage form performance of poor soluble compounds. This study explored the use of polymer blends as a formulation strategy to overcome this processability issue and to provide adjustable drug release rates from the printed dispersions...
November 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27517507/advances-in-printing-biomaterials-and-living-cells-implications-for-islet-cell-transplantation
#12
Zhilian Yue, Xiao Liu, Patrick T Coates, Gordon G Wallace
PURPOSE OF REVIEW: Rapid advances in bioprinting have attracted the attention of the clinical world. The advent of printable, cytocompatible materials and appropriate hardware provides an unprecedented ability to design and create 3D structures throughout which living cells and bioactive components are strategically distributed. Here, we review those advances and present how they can be used to create new structures for more effective islet cell transplantation. RECENT FINDINGS: There is a need for improvements in the delivery vehicle for transplantable islet cells...
October 2016: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/27504792/printed-organo-functionalized-graphene-for-biosensing-applications
#13
A Wisitsoraat, J Ph Mensing, C Karuwan, C Sriprachuabwong, K Jaruwongrungsee, D Phokharatkul, T M Daniels, C Liewhiran, A Tuantranont
Graphene is a highly promising material for biosensors due to its excellent physical and chemical properties which facilitate electron transfer between the active locales of enzymes or other biomaterials and a transducer surface. Printing technology has recently emerged as a low-cost and practical method for fabrication of flexible and disposable electronics devices. The combination of these technologies is promising for the production and commercialization of low cost sensors. In this review, recent developments in organo-functionalized graphene and printed biosensor technologies are comprehensively covered...
August 1, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27503606/alginate-sulfate-nanocellulose-bioinks-for-cartilage-bioprinting-applications
#14
Michael Müller, Ece Öztürk, Øystein Arlov, Paul Gatenholm, Marcy Zenobi-Wong
One of the challenges of bioprinting is to identify bioinks which support cell growth, tissue maturation, and ultimately the formation of functional grafts for use in regenerative medicine. The influence of this new biofabrication technology on biology of living cells, however, is still being evaluated. Recently we have identified a mitogenic hydrogel system based on alginate sulfate which potently supports chondrocyte phenotype, but is not printable due to its rheological properties (no yield point). To convert alginate sulfate to a printable bioink, it was combined with nanocellulose, which has been shown to possess very good printability...
August 8, 2016: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/27499417/multimaterial-4d-printing-with-tailorable-shape-memory-polymers
#15
Qi Ge, Amir Hosein Sakhaei, Howon Lee, Conner K Dunn, Nicholas X Fang, Martin L Dunn
We present a new 4D printing approach that can create high resolution (up to a few microns), multimaterial shape memory polymer (SMP) architectures. The approach is based on high resolution projection microstereolithography (PμSL) and uses a family of photo-curable methacrylate based copolymer networks. We designed the constituents and compositions to exhibit desired thermomechanical behavior (including rubbery modulus, glass transition temperature and failure strain which is more than 300% and larger than any existing printable materials) to enable controlled shape memory behavior...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27497530/nanosilver-conductive-ink-a-case-study-for-evaluating-the-potential-risk-of-nanotechnology-under-hypothetical-use-scenarios
#16
David P Martin, Nicolas L Melby, Shinita M Jordan, Anthony J Bednar, Alan J Kennedy, Maria E Negrete, Mark A Chappell, Aimee R Poda
Engineered nanomaterials (ENMs) are being incorporated into a variety of consumer products due to unique properties that offer a variety of advantages over bulk materials. Understanding of the nano-specific risk associated with nano-enabled technologies, however, continues to lag behind research and development, registration with regulators, and commercialization. One example of a nano-enabled technology is nanosilver ink, which can be used in commercial ink-jet printers for the development of low-cost printable electronics...
November 2016: Chemosphere
https://www.readbyqxmd.com/read/27474031/the-patient-s-guide-to-psoriasis-treatment-part-3-biologic-injectables
#17
REVIEW
Michael Abrouk, Mio Nakamura, Tian Hao Zhu, Benjamin Farahnik, Rasnik K Singh, Kristina M Lee, Margareth V Jose, John Koo, Tina Bhutani, Wilson Liao
BACKGROUND: An increasing number of injectable biologics are now available for the treatment of psoriasis. However, for individuals who have never received this therapy, the process of performing a self-injection can be daunting. There is lack of patient educational material on how to perform and optimize this treatment. OBJECTIVE: The objective of this study is to present a freely available online guide and video on biologic injections that is informative to patients and increases the success and compliance of patients starting this therapy...
September 2016: Dermatology and Therapy
https://www.readbyqxmd.com/read/27474029/the-patient-s-guide-to-psoriasis-treatment-part-1-uvb-phototherapy
#18
REVIEW
Rasnik K Singh, Kristina M Lee, Margareth V Jose, Mio Nakamura, Derya Ucmak, Benjamin Farahnik, Michael Abrouk, Tian Hao Zhu, Tina Bhutani, Wilson Liao
BACKGROUND: Psoriasis is a chronic immune-mediated disease that affects 2-3% of the world population. Ultraviolet B (UVB) phototherapy is an effective treatment for psoriasis compared to other systemic treatments. Currently there is a lack of easily accessible online patient educational material regarding this form of treatment. OBJECTIVE: To present a freely available online guide and video on UVB treatment that is informative to patients and increases the success and compliance of patients starting this therapy...
September 2016: Dermatology and Therapy
https://www.readbyqxmd.com/read/27436509/research-on-the-printability-of-hydrogels-in-3d-bioprinting
#19
Yong He, FeiFei Yang, HaiMing Zhao, Qing Gao, Bing Xia, JianZhong Fu
As the biocompatible materials, hydrogels have been widely used in three- dimensional (3D) bioprinting/organ printing to load cell for tissue engineering. It is important to precisely control hydrogels deposition during printing the mimic organ structures. However, the printability of hydrogels about printing parameters is seldom addressed. In this paper, we systemically investigated the printability of hydrogels from printing lines (one dimensional, 1D structures) to printing lattices/films (two dimensional, 2D structures) and printing 3D structures with a special attention to the accurate printing...
July 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27423857/arrayninja-an-open-source-platform-for-unified-planning-and-analysis-of-microarray-experiments
#20
B M Dickson, E M Cornett, Z Ramjan, S B Rothbart
Microarray-based proteomic platforms have emerged as valuable tools for studying various aspects of protein function, particularly in the field of chromatin biochemistry. Microarray technology itself is largely unrestricted in regard to printable material and platform design, and efficient multidimensional optimization of assay parameters requires fluidity in the design and analysis of custom print layouts. This motivates the need for streamlined software infrastructure that facilitates the combined planning and analysis of custom microarray experiments...
2016: Methods in Enzymology
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