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coating processes towards selective laser sintering of energetic material composites

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Defence Technology（防务技术） 2020年第2期16卷 316-324页

作者： Zetu Jiba Walter W.focke Lonji Kalombo Moshawe J.Madito council for Scientific and Industrial Research(cSIR) Defence Peace Safety and SecurityP.O Box 395Pretoria 0001South Africa University of Pretoria South Africa cSIR Chemical ClusterSouth Africa

This research aims to contribute to the safe methodology for additive manufacturing(AM)of energetic *** formulation processes were investigated and evaluated to find a suitable method that may enable selective laser sintering(SLS)as the safe method for fabrication of high explosive(HE)*** safety and co nvenie nce reasons,the co ncept demonstration was conducted using inert explosive simulants with properties quasi-similar to the real *** processes for simulant RDXbased microparticles by means of PcL and 3,4,5-trimethoxybenzaldehyde(as TNT simulant)are *** processes were evaluated for uniformity of coating the HE inert simulant particles with binder materials to facilitate the SLS as the adequate binding and fabrication *** system and single emulsion methods gave required particle near spherical morphology,size and uniform *** suspension process appears to be suitable for the SLS of HE mocks and potential formulation methods for active HE *** density is estimated to be comparable with the current HE compositions and plastic bonded explosives(PBXs)such as c4 and PE4,produced from traditional *** formulation method developed and understanding of the science behind the processes paves the way toward safe SLS of the active HE compositions and may open avenues for further research and development of munitions of the future.

关键词： coating processes Energetic materials Simulants Mock explosives Additive manufacturing Selective laser sintering

Introducing 3D-potting:a novel production process for artificial membrane lungs with superior blood flow design

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Bio-Design and Manufacturing 2022年第1期5卷 141-152页

作者： Fellx Hesselmann Jannls M.focke Peter c.Schlansteln NIklas B.Steuer Andreas Kaesler Sebastlan D.Relnartz Thomas Schmltz-Rode Ulrlch SteInselfer Sebastlan V.Jansen Jutta Arens Department of cardiovascular Engineering Instituteof Applied Medical EngineeringHelmholtz.InstituteRWTH Aachen UniversityPauwelsstrasse 2052074 AachenGermany Department of Diagnostic and Interventional Radiology Uniklinik RWTH AachenPauwelsstrasse 3052074 AachenGermany Department of Biomechanical Engineering Faculty of EngineeringTechnology University of TwenteDrienerlolaan 57522 NB EnschedeThe Netherlands

currently,artificial-membrane lungs consist of thousands of hollow fiber membranes where blood flows around the fibers and gas flows inside the fibers,achieving diffusive gas *** both ends of the fibers,the interspaces between the hollow fiber membranes and the plastic housing are filled with glue to separate the gas from the blood *** a uniaxial centrifugation process,the glue forms the“potting.”The shape of the cured potting is then determined by the centrifugation process,limiting design possibilities and leading to unfavorable stagnation zones associated with blood *** this study,a new multiaxial centrifugation process was developed,expanding the possible shapes of the potting and allowing for completely new module designs with potentially superior blood flow guidance within the potting ***-phase simulations of the process in conceptual artificial lungs were performed to explore the possibilities of a biaxial centrifugation process and determine suitable parameter sets.A corresponding biaxial centrifugation setup was built to prove feasibility and experimentally validate four conceptual designs,resulting in good agreement with the *** summary,this study shows the feasibility of a multiaxial centrifugation process allowing greater variety in potting shapes,eliminating inefficient stagnation zones and more favorable blood flow conditions in artificial lungs.

关键词： Potting process Flow design Membrane lung Artificial lung Hollow fiber membrane module Manufacturing

competition between Liquid-liquid De-mixing, crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET

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chinese Journal of Polymer Science 2020年第2期38卷 174-178,I0007页

作者： chanita Sungkapreecha Walter Wfocke Rene Androsch Interdisciplinary center for Transfer-oriented Research in Natural Sciences Martin Luther University Halle-Wittenberg06099 Halle/SaaleGermany University of Pretoria Institute for Sustainable Malaria control and MRc collaborating centre for Malaria Research Department of Chemical EngineeringUniversity of PretoriaPrivate Bag X20Hatfield 0028South Africa

Liquid-liquid(L-L)de-mixing and vitrification of solutions of either crystallizable poly(L-lactic acid)(PLLA)or non-crystallizable poly(D/L-lactic acid)(PDLLA)with 50 m%N,N-diethyl-3-methylbenzamide(DEET)were analyzed by calorimetry and cloud-point measurements,which allows drawing conclusions about the effect of polymer stereochemistry on the phase *** of the PLA stereochemistry,vitrification of the solutions on fast cooling,hindering crystallization of PLLA,occurred below-20℃ and suppressed prior L-L *** experimental results prove that crystallization in samples containing crystallizable PLLA,observed at around 55℃ on slow cooling,is not preceded by L-L de-mixing.

关键词： crystallization PLA DEET Liquid-liquid phase separation Thermally-induced phase separation(TIPS)