I-Calorimetry: Ukulinganisa Amandla Okushisa Ekuphenduleni Kwamakhemikhali
I-Pendahuluan
I-Calorimetry iyigatsha lesayensi elifunda ukulinganiswa kwezinguquko emandleni okushisa ekusabeleni kwamakhemikhali noma ezinqubweni zomzimba. Igama elithi "calorimetry" livela kwelesiLatini elithi "calor," elisho ukushisa, kanye nelithi "metri," elisho ukulinganisa. Le ndlela inikeza ukuqonda okubalulekile mayelana ne-enthalpy, i-entropy, kanye namandla okushisa ezinhlelo ezahlukene. Lesi sihloko sizobuyekeza imiqondo eyisisekelo ye-calorimetry, izinhlobo zama-calorimeter, izimiso zawo zokusebenza, kanye nokusetshenziswa kwawo emikhakheni ehlukahlukene njengekhemistri, i-biology, kanye ne-physics.
Imiqondo Eyisisekelo Ye-Calorimetry
Empeleni, i-calorimetry ihilela ukulinganisa izinguquko zokushisa ezenzeka lapho izinto ezimbili zihlangana noma zisabela. Ingxenye eyinhloko yale divayisi i-calorimeter, eyenzelwe ukunciphisa ukushintshaniswa kwamandla okushisa nendawo ezungezile. Umqondo oyisisekelo we-calorimetry umthetho wokuqala we-thermodynamics, othi amandla awakwazi ukudalwa noma ukubhujiswa kodwa angashintsha isimo kuphela. Kulokhu, amandla okushisa atholwe noma akhishwe uhlelo angasetshenziswa ukubala ushintsho lwamandla ngaphakathi kwalolo hlelo.
Izinhlobo zama-caloriemeter
1. I-Calorimeter Elula
I-calorimeter elula ngokuvamile iqukethe isitsha esenziwe ngezinto zokuvikela ezifana ne-polystyrene noma i-aluminium, sigcwaliswe ngamanzi, futhi sifakwe i-thermometer. Lolu hlobo lwe-calorimeter luvame ukusetshenziswa ezivivinyweni zemfundo yamabanga aphansi ukwethula umqondo we-calorimetry.
2. I-Calorimeter yebhomu
I-calorimeter yebhomu iyithuluzi eliyinkimbinkimbi kakhulu elisetshenziselwa ukukala izinguquko zamandla ekuphenduleni kokusha. Lawa ma-calorimeter aqukethe isitsha esingamelani nokushisa nokucindezela esibizwa ngokuthi "ibhomu," esibekwa esitsheni esigcwele amanzi. Uma isampula ishiswa ebhomu, ushintsho lokushisa emanzini luyalinganiswa ukuze kubalwe amandla okushisa akhiqizwayo.
3. I-Differential Scanning Calorimeter (DSC)
I-DSC iyithuluzi elisetshenziselwa ukutadisha izinguquko zesigaba kanye nokusabela kwamakhemikhali okwenzeka ezintweni lapho kushiswa noma kupholiswa. Ilinganisa umehluko wokushisa phakathi kwesampula kanye nereferensi, okuvumela ososayensi ukuthi banqume ama-enthalpies okuguqukayo, amaphuzu okuncibilika, kanye nezinye izici zokushisa.
4. I-Isoperibolic Calorimeter
I-calorimeter ye-isoperibolic igcina izinga lokushisa elizungezile lingaguquguquki kulo lonke ucwaningo. Lawa ma-calorimeter avame ukusetshenziswa ocwaningweni lwe-biochemical ukuthola izinguquko zamandla ekuphenduleni kwe-enzyme noma kwezinye izinqubo zebhayoloji.
Indlela I-Calorimeter Esebenza Ngayo
Isimiso sokusebenza se-calorimeter sihilela izinyathelo eziningana eziyisisekelo:
1. Ukulinganisa: I-calorimeter kumele ilinganiswe ukuze kutholakale amandla ayo okushisa. Lesi sinyathelo sihilela ukwengeza inani lokushisa elaziwayo nokurekhoda ushintsho lokushisa oluvelayo.
2. Ukusethwa Kwesampula: Isampula ifakwa ku-calorimeter, bese uhlelo luvalwa ukuze kuvinjelwe ukushintshaniswa kwamandla nendawo ezungezile.
3. Ukuqaphela Izinguquko Zezinga Lokushisa: Ngemva kokuba ukusabela sekuqediwe, izinguquko zezinga lokushisa ezenzeka ohlelweni ziyalinganiswa.
4. Ukubalwa Kwamandla: Kusetshenziswa umthetho wokuqala we-thermodynamics kanye nedatha yokushintsha kwezinga lokushisa, amandla akhiqizwa noma asetshenziswa yi-reaction ayabalwa.
Izicelo ze-Calorimetry
I-Calorimetry inezinhlobo eziningi zezicelo, kusukela ocwaningweni oluyisisekelo kuya ezicelweni ezisebenzayo embonini.
1. Ikhemistri
Kumakhemikhali, i-calorimetry isetshenziselwa ukunquma izakhiwo ze-thermodynamic zokusabela, njenge-enthalpy kanye ne-entropy. Isibonelo, ocwaningweni lwe-kinetics yamakhemikhali, i-calorimetry ingasiza ekulinganiseni amazinga okusabela kanye nezindlela zokusabela. I-calorimetry yamabhomu, ikakhulukazi, isetshenziselwa ukukala ukushisa kokushiswa kwamafutha nokudla.
2. Ibhayoloji
I-Calorimetry idlala indima ebalulekile ku-biology yama-molecule kanye nocwaningo lwe-biochemistry. Isibonelo, ezifundweni ze-enzyme, i-calorimetry isetshenziselwa ukunquma amandla okusebenza kanye ne-enzyme kinetics, kanye nezinguquko zamandla ezenzeka ngesikhathi sokusabela kwe-enzyme-substrate. I-Calorimetry isetshenziswa futhi ocwaningweni lwe-protein, njengokuhlaziya ukuzinza kwe-protein kanye nokugoqeka.
3. Ifiziksi
Ku-physics, i-calorimetry isetshenziselwa ukukala amandla athile okushisa kwezinto kanye nezinguquko zesigaba, njengokuncibilika kanye ne-sublimation. I-DSC, ikakhulukazi, isetshenziselwa ukuhlaziya izakhiwo zokushisa zezinto ze-polymer kanye nezinto ezihlanganisiwe, kanye nokufunda ukuguquka kwesigaba ezintweni ze-crystalline kanye ne-amorphous.
4. Imboni
Emkhakheni wezimboni, i-calorimetry isetshenziselwa ucwaningo kanye nokuthuthukiswa komkhiqizo, njengemithi, izithako zokudla, kanye namafutha. Isibonelo, embonini yemithi, i-calorimetry isetshenziselwa ukuthuthukisa nokuhlola ukuzinza kokushisa kwemithi, kuyilapho embonini yokudla, izikhathi zokupheka kanye nokulinganisela kwamandla emikhiqizweni yokudla kungenziwa ngcono ngosizo lwe-calorimetry.
Ucwaningo Lwecala: Ukusetshenziswa kwe-Calorimetry ocwaningweni lwezemithi
Isibonelo esisodwa sokusetshenziswa kwe-calorimetry ocwaningweni lwezemithi yisifundo sokuzinza kokushisa kwemithi. Kulolu cwaningo, i-DSC ingasetshenziswa ukuhlaziya izinguquko zesigaba emithini eqinile yemithi nokunquma amaphuzu okuncibilika kanye nezinguquko ze-enthalpy ezihlobene nalezi zinqubo. Lolu lwazi lubalulekile ekuqinisekiseni ukuzinza kwemithi kanye nokusebenza kahle ngesikhathi sokugcina kanye nokuthuthwa kwayo.
Izinselele Nekusasa Le-Calorimetry
Nakuba i-calorimetry iyithuluzi elinamandla, ibhekene nezinselele eziningana. Enye iwukunemba kokulinganisa, ikakhulukazi ekuhlolweni okubandakanya izinguquko ezincane kakhulu zamandla. Ngaphezu kwalokho, ukuvikela ukushisa okuphelele kunzima ukukufeza, okungaholela emaphutheni okulinganisa.
Kodwa-ke, ngentuthuko yezobuchwepheshe, amathuluzi e-calorimetry asethuthukile futhi anembile kakhulu. Ukusetshenziswa kwezinzwa zedijithali, ukulawulwa kokushisa okuthuthukisiwe, kanye nesofthiwe yokuhlaziya idatha eyinkimbinkimbi kuvumela ukulinganisa okunembile nokusebenza kahle. Esikhathini esizayo, i-calorimetry kulindeleke ukuthi idlale indima enkulu ocwaningweni oluhlukahlukene, okuhlanganisa i-nanotechnology, isayensi yezinto ezibonakalayo, kanye ne-biology yezinhlelo.
Isiphetho
I-Calorimetry iyisifundo esibalulekile sesayensi esinezinhlelo eziningi kumakhemikhali, i-biology, i-physics, kanye nemboni. Ngokulinganisa izinguquko zamandla okushisa ekuphenduleni kwamakhemikhali kanye nezinqubo zomzimba, le ndlela inikeza ukuqonda okujulile ngezakhiwo ze-thermodynamic zezinhlelo ezahlukene. Naphezu kokubhekana nezinselele eziningana, intuthuko yezobuchwepheshe iyaqhubeka nokuthuthukisa ukunemba nokusebenza kahle kwezilinganiso ze-calorimetric. Ngenxa yalokho, i-calorimetry izoqhubeka nokuba ithuluzi elibalulekile ocwaningweni nasekuthuthukisweni kuzo zonke izinhlobo ezahlukene zezifundo.
