Page 22 - 《精细化工》2023年第4期

g708g ㇫㏳ࡃጒ FINE CHEMICALS す 40 ࢤ

ᒀ⩢ⷮ∏ᄱڒ॥∏ᱽ᫆㶕䲏ᬣ喑ᰭ⤳ᘠ⟣ᔮ᭜⩢ⷮ ᄦ⩢ⷮ∏⮱㶝ۼ㘪߈䊷ᑧȡ
∏ᱽ᫆㶕䲏჋⣝䰣ࣺᄱȡᒀ⩢ⷮ∏ែᄱݝᱽ᫆㶕䲏 ఍ₑ喑㺮᣽倅ᱽ᫆⮱॥ᩣᕔ㘪喑ᓲ䶨ᄦᱽ᫆⮱
ᬣ喑ᱽ᫆⮱ࣺᄱ㈨᪝喍R喎जᵦᢛᐼ喍1喎~喍3喎Ⅿᓄ喟 ⩢࣯ⷮ᪝喍İ, ȝ喎҉ܧव⤳⮱䃫䃎হ䔶᠖喑㐩व㔰㭾
Z Z ᱽ᫆⮱䭨ោࡦ䙺হ㶝ۼ➦ᕔ喑ٲܳхࡃᱽ᫆⮱㏱ܳ
R 0 喍1喎
Z Z 0 হ㐀ᲱВᓄݝᰭҠ⮱⩢࣯ⷮ᪝ȡ
P
Z Z 0 r 喍2喎 2 ̺ह⻺ㆨ䲆⩢㏧͊॥∏ᱽ᫆
H r
P ฺౕव㏠ㆠ㏑㐡͚喑඘᫆⮱⻺ㆨ̺हᄦ⩢ⷮ∏
Z H 0 0 喍3喎 ⮱҉⩕࣌⤳̺हȡᄦλ๔䘕ܳᄩ⩢඘᫆喑ຯ䛾ᆋࣷ
0
ᐼ͚喟R ࣺͧᄱ㈨᪝喠Z А㶕॥∏ᱽ᫆⮱䭨ោ喑ȍ喠 ڣ⅔ࡃ➖Ƞⷠᱽ᫆Ƞᄩ⩢㖇व➖ぶ喑ౕ⩢ⷮ౧হᱽ
Z 0 А㶕㜗⩞⾧䬡䭨ោ喑ȍ喠İ r হ ȝ r ܳݘА㶕ᱽ᫆⮱ ᫆㶕䲏⮱䒪≮ၽ҉⩕̸喑⩢ⷮ∏㷘॥ᩣ䒙ࡃ [15] ȡѳ
ฺϸ⩢፥᪝হฺⷮᄩ⢴喠İ 0 হ ȝ 0 ܳݘͧ⾧⅁⮱ϸ⩢ 䓴倅⮱ᄩ⩢ᕔчᄩ㜡ϸ⩢፥᪝䓴๔喑䭨ោ̺ࡦ䙺喑
፥᪝হⷮᄩ⢴ȡ⩞ڙᐼ喍1喎হ喍2喎जⴒ喑ᒀ॥∏ ϻ㔹ᒞ৺॥ᩣᢌ㕄ȡᄦλⷮᕔᑧ⮱඘᫆喑ຯ䧮Ƞ䧡Ƞ
ᱽ᫆⮱ฺⷮᄩ⢴হฺϸ⩢፥᪝䊷ᣒ䓾ᬣ喑⩢ⷮ∏ౕ 䩺ࣷ䧮⅔Ҁᱽ᫆喑㮪♣̺ч෋ߍᱽ᫆⮱ࣺᄱᢌ㕄喑
॥∏ᱽ᫆㶕䲏⮱ࣺᄱ㈨᪝ᅞ䊷ᣒ䓾 0喑ₑᬣӬ჋⣝ ѳजВᎠ㶎ᱽ͚᫆⮱ϸ⩢፥᪝喑෋ߍᱽ᫆⮱ڒᄱ⢴喑
γ⾧⅁̻ᱽ᫆͸䬡⮱䭨ោࡦ䙺 [10] ȡ [16]
ϻ㔹᣽倅ᱽ᫆ᄦ⩢ⷮ∏⮱㶝ۼ㘪߈ ȡ఍ₑ喑㺮჋
䕇፥ᗲ̸ۢ喑ᵦᢛ≸ᓄ⮱ฺϸ⩢፥᪝হฺⷮᄩ⢴
⣝倅ᕔ㘪⩢ⷮᅼ㩪ࣷ॥∏ᱽ᫆⮱ݣิ喑ᓲ䶨ᵦᢛᱽ
᪝ᢛजౕэ䓀㏬⤳䃧̸䕇䓴ᐼ喍4喎~喍5喎䃎ツܧ॥
᫆⮱Ꮑ⩕౧ᮜᲒᎠ㶎ᱽ᫆⮱䭨ោࡦ䙺̻㶝ۼ➦ᕔȡ
∏ᱽ᫆⮱ࣺᄱᢌ㕄թ喍RL喎喑ВₑᲒ䃱Фڣ॥∏ᕔ㘪喟
Ⱋݺ喑̻䲆⩢㏧͊㏑㐡Ⱕ㐀व⮱ᱽ᫆ͨ㺮࠲᠙䛾ᆋ
Z Z ( /HP ) 1/2 tanh [ (2ʌ /)(j fd c H P ) 1/2 ] 喍4喎
in RL 0 20log (| Z r r Z ) (/ Z Z r r ) | 喍5喎 ࣷڣ⅔ࡃ➖Ƞⷠᱽ̻᫆ᄩ⩢㖇व➖Ƞ䓴⍎䛾ᆋⷠࡃ
in 0 in 0 ➖হ็ᅯฺव➖ぶȡ
ᐼ͚喟RL 㶕⹧ࣺᄱᢌ㕄թ喑dB喠Z in 㶕⹧॥ᩣݯ⮱ 2.1 䛾ᆋࣷڣ⅔ࡃ➖ฺव㏠ㆠ㏑㐡
䓀ڒ䭨ោ喑ȍ喠f 㶕⹧ᓛ∏䶾⢴喑Hz喠h喑j ͧڙᐼᣕ 䕇䓴䲆⩢㏧͊ឭᱜݣิ⮱ⷠ㏠ㆠ㏑㐡喍CNFs喎
ᄩ䓴⼸࣯᪝喑ᬍ჋䭲ᘼͶ喠d 㶕⹧॥ᩣݯ⮱ࣇᏓ喑m喠 ̻䛾ᆋ㏠ㆠ䷄ㆿฺव⮱ᱽ᫆喑ຯ Co/CNFsȠFe/CNFsȠ
8
c 㶕⹧ٶ䕌喍3.0×10 m/s喎ȡ㶕 1 ͧ॥∏ᱽ᫆⮱ࣺᄱ Ni/CNFs ᭫⹧ܧγ㞜ສ⮱॥∏ᕔ㘪喑౴࠭ܳ᪐ౕ㖇
ᢌ㕄թ̻⩢ⷮ∏॥ᩣ⢴͸䬡⮱ᄦᏁڠ㈨ȡ व➖㏑㐡͚⮱䛾ᆋ⻨ၽजВ෋ᑧᱽ᫆⮱ᄩ⩢ᕔ喑䧮Ƞ
䧡Ƞ䩺ぶ䛾ᆋ䔅जВ෋ߍᱽ᫆⮱ⷮᢌ㕄ȡ䛾ᆋ⅔ࡃ
㶕 1 ࣺᄱᢌ㕄թ̻⩢ⷮ∏॥ᩣ⢴⮱ᄦᏁڠ㈨ [10]
Table 1 Corresponding relationship between reflection loss ➖㮪♣ᄩ⩢ᕔ̺䋠喑ᬍ∂᣽ӈᄩ⩢ᢌ㕄喑ѳजౕᱽ
value and electromagnetic wave absorption rate [10] ᫆ڲ䘕ᒏ᜽⩢֣Ხⴖϔ⩌ϸ⩢ᢌ㕄喑ຯ Fe 3 O 4 ͚⮱
3+
2+
ࣺᄱᢌ㕄թ/dB ⩢ၽजВౕ͑⻺⅔ࡃᔮ喍Fe হ Fe 喎͸䬡䒙⼨㔹
[17] [18]
–5 –10 –20 ڤᰶⷮᢌ㕄হϸ⩢ᢌ㕄⮱ࡼह᩵Ꮑ ȡHAN ぶ
⩢ⷮ∏॥ᩣ⢴/% 68.4 90.0 99.0 䕇䓴䲆⩢㏧͊হ☚ั⤳ݣᓄ Į-Fe 2 O 3 ㏠ㆠ㏬喑䮼ऻ
ౕ H 2 ⅁ⅈ͚В 250 Ď䔅࣌ݣิγ Fe 3 O 4 ㏠ㆠ㏬喑ϻ
1.2 㶝ۼ➦ᕔ ఫ 2a ͚⮱ TEM ఫजВⰸܧ喑ڣⰡᒱౕ 50~60 nm喑
㶝ۼ➦ᕔ㺮Ⅿ䔈ڒᱽ᫆ڲ䘕⮱⩢ⷮ∏㘪์䕇䓴 ϻ HRTEM ͚≸ᓄ⮱喍311喎䲏䬡䌊̻ Fe 3 O 4 ̭㜡ȡ
ϸ⩢ᢌ㕄Ƞⷮᢌ㕄ぶᢌ㕄ᱧݣ㷘䒙ࡃͧ☚㘪ᝃڣЃ हᵤ喑ౕ 350 Ď䔅࣌ݣิγ Fe ㏠ㆠ㏬喑ఫ 2b जВ
ᒏᐼ⮱㘪㔹ᔘ䕌㶝ۼ [12] ȡ॥ᩣ⮱⩢ⷮ∏ౕᱽ᫆ڲ䘕 ⰸܧ喑ڣⰡᒱౕ 30~40 nm喑ᮣᵩ䬡䌊Ό̻ Fe Ⱕᄦ
ч䕇䓴็⻺ᒏᐼ㷘㕄᪐喑ڣౕᱽ͚᫆⮱㶝ۼ㈨᪝喍Į喎 Ꮑȡ䄒ฺवᱽ᫆ᰭᄼࣺᄱᢌ㕄喍RL min 喎ౕ 6.2 GHz
ज㶕⹧ͧ [13] 喟 ̸䓫ݝγ–17.2 dB喑ࣇᏓͧ 5.50 mmȡ㞜ສ⮱॥∏ᕔ
ʌf 㘪जᑿ఍λ喟̭᫦䲏喑⩢㏧㏠ㆠ㏑㐡⮱ᒏ⟣ऱाᐯ
D (P cc ) {2 [tan tanG G 1
H
1/2
c İ m ᕔ㘪์ᬻ᭫ᒞ৺ᓛ㐀Ჱহ㏠ㆠ㐀Ჱᱽ᫆⮱ⷮᕔ喑ϻ㔹
(1 tan G 2 İ tan G 2 m tan G 2 İ m ) 1/2 ]} 1/2 喍6喎 ᄦ䧮ധ䷄ㆿ⮱ⷮᕔڤᰶ䄰ᣔ҉⩕ ȡϻⷮ␋ఋ㏬喍ఫ
G
[5]
ᐼ͚喟tanį İ 喍tanį İ =İƎ/İƍ喎ͧᱽ᫆⮱ϸ⩢ᢌ㕄㻿ₐܴ喠 2c喎͚जВⰸܧ喑Fe 3O 4 ㏠ㆠ㏬হ Fe ㏠ㆠ㏬⮱亞হⷮ
tan௔į m 喍tan௔į m =®Ǝ/®ƍ喎ͧᱽ᫆⮱ⷮᢌ㕄㻿ₐܴȡᢌ ࡃᑧᏓթ喍M s 喎ܳݘ㏓ͧ 57.7 হ 133.9 emu/g喑ѻλ
㕄㻿ₐܴթ䊷๔喑㶕⹧ᄳ⩢ⷮ∏䒙ᢏͧڣЃᒏᐼ㘪 ⰥᏁ⮱๔಄ᱽ᫆ȲM s 喍Fe 3 O 4 喎596.5 emu/g喠M s 喍Fe喎
䛼⮱㘪߈䊷倅 [14] 喑ࢠϸ⩢ᢌ㕄হⷮᢌ㕄ᘵ๔⮱ᱽ᫆ 5217.6 emu/g喑300 Kȳȡहᬣ喑ᒏ⟣ऱाᐯᕔ䔅ᰶߖ