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All of them are Adverbial Particles. (부사격조사)
***The particle -에 marks the dative as well as several other functions.
1. In conjunction with a verb of motion, the particle -에 marks a goal.
저는 학교에 갑니다.
2. When a verb other than a verb of motion is predicate, the particle
-에 is used with nouns denoting spaces to mark spatial location.
저는 내일 회사에 있겠습니다.
3. When used in conjunction with nouns denoting time, the particle -에
marks temporal location : in, on, or at a certain time.
몇 시에 집에 갑니까?
4. The particle -에 can also mark the source of an action.
천둥 소리에 깜짝 놀랐어요.
5. When used in conjunction with nouns denoting numberals, the particle
-에 marks a unit of value or proportion (at, in, for, by, per).
이 물건은 한 개에 천원입니다.
***-(으) 로 with, using, by means of; as, for, in the capaity of;
(change of state) into; to, in the direction of; because of/due, owing to
1. The basic function of the instrumental particle (조격조사) -(으) 로
is to denote the method, instrument or means by which a certain action
comes about. Nouns ending in a final consonant (except ㄹ) take -으로,
and nouns ending in a final vowel or ㄹ take -로.
그 책상은 나무로 만들었어.
2. The particle -(으) 로 has other functions besides marking instrumentals.
- In conjunction with verbs of motion, the particle -(으) 로 can
denote direction.
어디로 가세요?
- The particle -(으) 로 can also denote a source or reason.
저는 병으로 무척 고생했습니다.
- The particle -(으) 로 can denote either the manner or an action
or the end-point of a process of change.
몰이 얼어서 얼음으로 변했어요.
- The particle -(으) 로 can attach to nouns denoting humans to
express status, capacity, position or qualifications.
그 분은 의사로 병원에서 일해요.