23 documents found, page 1 of 3
Ferronematic liquid crystal polymers and elastomers
Reeves, Sarah J.; Davis, Fred J.; Mitchell, Geoffrey R.Liquid crystal polymers, through covalent bonding, combine the spontaneous long range orientational order of the liquid crystal state with the entropically driven random coil configurations of the skeletal polymer chains in a single material [1]. [...]
Measuring in-situ X-ray scattering of natural rubber biaxial deformation: A new...
Silva, Daniel P. da; Lamolinara, Barbara; Costa, André; Gameiro, Fábio; Pascoal-Faria, Paula; Mateus, Artur; Martinez, Juan Carlos; Phinyocheep, PraneeUnderstanding biaxial deformation is essential for a more realistic evaluation of rubber elasticity compared to the more usual uniaxial deformation. To study crystallisation occurring during biaxial deformation of natural rubber films, a new simple equipment has been designed and assembled. The equipment, mounted in the beamline of ALBA synchrotron light source facility, allowed the in-situ measurement of X-ray...
Additive manufactured Poly("-caprolactone)-graphene scaffolds: Lamellar crystal...
Biscaia, Sara; Silva, João C.; Moura, Carla; Viana, Tânia; Tojeira, Ana; Mitchell, Geoffrey R.; Pascoal-Faria, Paula; Ferreira, Frederico CasteloUnderstanding the mechano–biological coupling mechanisms of biomaterials for tissue engineering is of major importance to assure proper scaffold performance in situ. Therefore, it is of paramount importance to establish correlations between biomaterials, their processing conditions, and their mechanical behaviour, as well as their biological performance. With this work, it was possible to infer a correlation be...
Time-resolving small angle X-Ray scattering analysis of melt crystallization of...
Auriemma, Finizia; Ruiz de Ballesteros, Odda; Giusto, Giovangiuseppe; Di Girolamo, Rocco; Malafronte, Anna; Scoti, Miriam; De Rosa, ClaudioThe melting/crystallization properties of blends obtained by mixing two isotactic polypropylene (iPP) samples synthesized using single-site metallocene catalyst systems and containing a high and low concentration of rr triads as stereo-defects, are studied. The changes occurring at lamellar length scale during a heating/cooling cycle at constant scanning rate are followed in situ by performing time-resolved sma...
The use of scattering data in the study of the molecular organisation of polyme...
Gkourmpis, Thomas; Mitchell, Geoffrey R.Scattering data for polymers in the non-crystalline state, i.e., the glassy state or the molten state, may appear to contain little information. In this work, we review recent developments in the use of scattering data to evaluate in a quantitative manner the molecular organization of such polymer systems. The focus is on the local structure of chain segments, on the details of the chain conformation and on the...
Protein Nanocarriers for Targeted Drug Delivery for Cancer Therapy
Kariduraganavar, Mahadevappa Y.; Heggannavar, Geetha B.; Amado, Sandra; Mitchell, Geoffrey R.This chapter describes how proteins can be used to provide effective targeted nanocarriers for drugs to target tumors. This approach offers an exciting framework for cancer therapies in the future, allowing multiple therapeutic agents and other functions to be combined in the same particle and ensuring a lower toxicity for the patient. The use of proteins provides a rich library of functional molecules to explo...
Microwave Treatment of Polyacrylonitrile Powder Method Development and Effects ...
Koutsonas, Spiridon; Mitchell, Geoffrey R.; Davis, Fred J.The aim of this article is to develop a method in order to investigate the surface modifications of degraded polyacrylonitrile powders under microwave treatment in air. Microwave treatment of polyacrylonitrile powders in air recorded two stages of degradation firstly an exothermic reaction that started in the range of (86-117)°C. Secondly the Thermal runway here the weight loss reached a peak value between 80-9...
Towards a Conceptual Notion for a Universal Printing Machine
Martins-Ferreira, Nelson; Alves, Nuno; Mitchell, Geoffrey R.The idea of Universal Printing Machine is advanced. It is designed to serve as a theoretical model for 3D printing. Suitable mathematical structures are proposed as a framework for the Universal Printer.
Biomaterials for In Situ Tissue Regeneration: A Review
Abdulghani, Saba; Mitchell, Geoffrey R.This review focuses on a somewhat unexplored strand of regenerative medicine, that is in situ tissue engineering. In this approach manufactured scaffolds are implanted in the injured region for regeneration within the patient. The scaffold is designed to attract cells to the required volume of regeneration to subsequently proliferate, differentiate, and as a consequence develop tissue within the scaffold which ...
Polyethylene and the Nucleating Agent: Dibenzylidene Sorbitol, a Neutron Scatte...
Mitchell, Geoffrey R.; Pratumshat, Supatra; Olley, RobertDibenzylidene Sorbitol is a very effective clarification additive for isotactic polypropylene. It is not effective with polyethylene although recent studies have shown that it can act as an effective nucleating and directing agent. We employ small-angle neutron scattering measurements to more fully understand the behavior of dibenzylidene sorbitol in a polyethylene matrix. The small-aangle neutron scattering cl...