材料英语证书考试(pec)-高级材料术语

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1、材料英语证书考试(PEC)-高级材料术语amphiphilic(`lovingboth').Oneendofanamphiphilicmoleculeispolarandhydrophilic(waterloving)andtheotherisnon-polarandhydrophobic(waterhating).Thehydrophilicendsofthemoleculepointoutwardsintothesolutionandthehydrophobicendspointinwardsawayf

2、romthewater,sotheytendtoself-assembleinwater.Amphiphilicmaterialsarealreadywidelyused,butresearchintotheirusefordrugdeliveryandultrasoundimagingisrelativelynew.auxeticmaterials.Growfatterwhenstretchedandthinnerwhencompressed�theoppositeofarubberband.Auxeti

3、cmaterialsareresistanttoimpact,sotheyhavepossibleusesascarbumpers,gasketsinengines,soundproofingandinbullet-proofvests.FormoreinformationseeBackground(AuxeticMaterialsNetwork,UK)andAuxeticmaterials�applications(Azom.com).biomaterial.Asyntheticmaterialusedt

4、oreplacepartofalivingsystemortofunctioninlivingtissue.Abiomaterialisdifferentfromabiologicalmaterialinthatitisengineeredratherthanbeingnaturallyproducedbyabiologicalsystem.ceramics.Areinorganic,non-metallicsolidsprocessedorusedathightemperatures.Aceramicis

5、madebycombiningmetallicandnon-metallicelements.Traditionalceramicproductssuchasclaypotsandchinawarearehard,porousandbrittle.Modernceramicsareusedtocreatebonesandteeth,cuttingtoolsortoconductelectricity.FormoreinformationseeAdvancedceramics(Azom.com)andAbou

6、tceramics(TheAmericanCeramicSociety).composites.Areformedbycombiningtwoormorematerialsthathavequitedifferentproperties.Thedifferentmaterialscombinetogivethecompositeuniqueproperties,butwithinthecompositeyoucaneasilytellthedifferentmaterialsapart�theydonotd

7、issolveorblendintoeachother.Fibreglassisacompositematerialmadefromglassfibreswhichgiveititsstrengthandaflexiblepolymerresin(matrix)thatbindsthefibrestogether.FormoreinformationseePuttingittogether–thescienceandtechnologyofcompositematerials(Nova:Scienceint

8、henews,AustralianAcademyofScience).immunesystem.Thecells,tissuesandorgansthatassistthebodytoresistinfectionanddiseasebyproducingantibodiesand/oralteredcellsthatinhibitthemultiplicationoftheinfectiousagent.Kev