简介：Grapheneisaremarkablematerialwithgreatpotentialinmanyapplicationsduetoitschemicalandphysicalproperties.Inthisreviewwebrieflypresenttherecentresearchprogress(2016-2018)ingrapheneandgraphene-basednanomaterialssynthesisanddiscussthepracticalaspectsofusingthematerialsproducedviathesemethodsfordifferentgraphene-basedapplications.

简介：Thelargesize,crack-freeZr55Cu30Al10Ni5bulkmetallicglass(BMGs)withthediameterof54mmandtheheightof15mmwasbuiltbylasersolidformingadditivemanufacturingtechnology,whosesizeislargerthanthecriticaldiameterbycasting.Themicrostructure,tensileandcompressivedeformationbehaviorsandfracturemorphologyoflasersolidformedZr55Cu30Al10Ni5BMGswereinvestigated.Itisfoundthatthecrystallizationmainlyoccursintheheat-affectedzonesofdepositionlayers,whichconsistofAl5Ni3Zr2,NiZr2,ZrCu,CuZr2phases.Thecontentofamorphousphaseinthedepositisabout63%.Underthecompressiveloading,thedepositpresentsnoplasticitybeforefractureoccurs.Thefractureprocessismainlycontrolledbytheshearstressandthecompressiveshearfractureanglesofabout39.Thecompressivestrengthreaches1452MPa,whichisequivalenttothatofas-CastZr55Cu30Al10Ni5BMGs,andthereexistvein-likepatterns,river-likepatternsandsmoothregionsatthecompressivefractography.Underthetensileloading,thedepositpresentsthebrittlefracturepatternwithoutplasticdeformation.Thefractureprocessexhibitsnormalfracturemodel,andthetensileshearfractureangleofabout90°.Thetensilestrengthisonlyabout609MPa,andthetensilefractographymainlyconsistsofmicro-scaledcoresandvein-likepatterns,dimple-likepatterns,chocolate-likepatternsandsmoothregions.Theresultsfurtherverifiedthefeasibilityandlargepotentialoflaseradditivemanufacturingonfabricationandindustrialapplicationoflarge-scaleBMGsparts.

简介：Apolyacrylicacid(PAA)/gelatin(Gela)/polyvinylalcohol(PVA)hydrogelwaspreparedbycopolymerization,cooling,andfreezing/thawingmethods.Thistriplenetwork(TN)structurehydrogeldisplayedsuperiormechanicalproperties,lowswellingratioandself-healingproperties,ThesuperiormechanicalpropertiesareattributedtothetriplehelixassociationofGelaandPVAcrystallitesbyreversiblehydrogenbonding.Thecharacterizationresultsindicatedthatthefracturestressandthestrainwere808kPaand370%respectively,whilethecompressionstrengthcouldreach4443kPaandthecompressivemoduluswasupto39MPaunderthedeformationof90%.ThehydrogenbondinginPVAcontributedtomaintainandimprovetheself-healingabilityofhydrogels.Everytypeofhydrogelsexhibitedahigherswellingratiounderalkalineconditions,andtheswellingratiosofPAA,PAA/PVAandPAA/Gelahydrogelswere27.71,12.30and9.09,respectively.ThePAA/Gela/PVATNhydrogelshowedthelowestswellingratio(6.57)amongthesehydrogels.TheseresultsindicatethatthenovelTNhydrogelspossessgoodenvironmentaladaptabilityandhavepotentialapplicationsinthebiomedicalengineeringandsensorfield.