類竹鼠牙釉質(zhì)含鐵羥基磷灰石的仿生合成與性能研究
發(fā)布時間:2018-05-14 13:45
本文選題:竹鼠紅色牙釉質(zhì) + Fe-HA��; 參考:《西南交通大學(xué)》2017年碩士論文
【摘要】:包括人在內(nèi)的大多數(shù)哺乳動物牙齒內(nèi)的無機相均為羥基磷灰石,遺憾的是,現(xiàn)階段,羥基磷灰石陶瓷很少用作牙科修復(fù)材料,這主要歸因于其脆性大和力學(xué)性能差的問題沒有得到很好的解決。同時,納米HA顆粒的微觀結(jié)構(gòu)、結(jié)晶形態(tài)及摻雜改性等方面還有待于進一步研究。已有文獻表明,相比于人牙,竹鼠牙釉質(zhì)顯示出更高硬度、更好的耐磨性和耐酸蝕能力。因此,本研究通過仿生合成與天然牙釉質(zhì)類似的羥基磷灰石,有望提高羥基磷灰石的綜合性能,擴展其在牙科修復(fù)材料方面的應(yīng)用。本文以竹鼠切牙表面紅色釉質(zhì)作為仿生對象,采用多種分析測試手段,表征分析了竹鼠切牙釉質(zhì)內(nèi)羥基磷灰石的微觀結(jié)構(gòu)以及成分組成。在此基礎(chǔ)上,以Ca(NO_3)_2·4(H_2O)、Fe(NO_3)_3·9(H_2O)和(NH_4)_2HPO_4為原料,利用超聲輔助微波水熱合成法制備類竹鼠牙釉質(zhì)含F(xiàn)e羥基磷灰石(Fe-HA),研究了 Fe含量對合成Fe-HA物相組成、晶體結(jié)構(gòu)和微觀形貌的影響,并進一步表征了 Fe含量對Fe-HA復(fù)合生物陶瓷顯微硬度、耐酸蝕性能、摩擦學(xué)性能以及抗菌性能的影響。1)竹鼠紅色牙釉質(zhì)內(nèi)的無機相主要為含F(xiàn)e羥基磷灰石,Fe的相對含量約為6.08 wt%;含F(xiàn)e羥基磷灰石晶體為短棒狀,長度約100 nm,直徑約20 nm,其擇優(yōu)生長晶面為(002)。2)采用超聲輔助微波水熱合成法制備了缺鈣型Fe-HA納米顆粒,其含有少量的CO_3~(2-),晶粒尺寸均勻,結(jié)晶度較低,與竹鼠牙釉質(zhì)HA結(jié)構(gòu)類似。Fe含量對Fe-HA的形貌和晶體結(jié)構(gòu)具有較大的影響,其中,Fe含量為1.5 wt%時,所制備的HA晶粒結(jié)晶度最佳,呈短棒狀,長度約100 nm,直徑約15 nm。3)往復(fù)滑動磨損試驗、浸泡試驗和細菌試驗結(jié)果顯示,相對于純HA陶瓷,Fe1.5 wt%-HA生物陶瓷具有優(yōu)異的機械性能(高硬度和高耐磨性)、更好的耐酸蝕能力及較優(yōu)的抗菌性能。
[Abstract]:The inorganic phases in most mammalian teeth, including human beings, are hydroxyapatite. Unfortunately, hydroxyapatite ceramics are rarely used as dental restoration materials at this stage. The main reason is that the problems of high brittleness and poor mechanical properties have not been solved well. At the same time, the microstructure, crystalline morphology and doping modification of HA nanoparticles need to be further studied. Compared with human teeth, the enamel of bamboo rodents shows higher hardness, better wear resistance and acid corrosion resistance. Therefore, the synthesis of hydroxyapatite similar to natural enamel is expected to improve the comprehensive properties of hydroxyapatite and expand the application of hydroxyapatite in dental restoration. In this paper, the surface red enamel of bamboo rat incisors was used as biomimetic object, and the microstructure and composition of hydroxyapatite in enamel of bamboo rat incisor were characterized and analyzed by various analytical methods. On this basis, the effects of Fe content on the phase composition, crystal structure and microstructure of synthetic Fe-HA enamel were studied by using Ca(NO_3)_2 _ 4H _ 2O _ 2 and NH _ 4S _ 2HPO _ 4 as raw materials. The effect of Fe content on the microhardness and acid corrosion resistance of Fe-HA composite bioceramics was further characterized. Effects of tribological and antibacterial properties. 1) the inorganic phase in red enamel of bamboo rat is mainly composed of the relative content of Fe hydroxyapatite and the relative content of Fe in the enamel is about 6.08 wt. the crystal of Fe-containing hydroxyapatite is in the shape of a short rod. Calcium deficient Fe-HA nanoparticles were prepared by ultrasonic assisted microwave hydrothermal synthesis method. The nanocrystals containing a small amount of CO _ 3O _ 3O _ 2-O _ (2) have uniform grain size and low crystallinity, and the crystal size is uniform, and the crystallinity is low, the length is about 100 nm and the diameter is about 20 nm. The morphology and crystal structure of Fe-HA were greatly affected by the content of .Fe, which was similar to the HA structure of the enamel. When the content of Fe was 1.5 wt%, the crystallinity of HA was the best with short rod shape. About 100 nm in length and 15 nm.3 in diameter) reciprocating sliding wear test, immersion test and bacterial test show that, Compared with pure HA ceramics, Fe1.5 wt%-HA bioceramics have excellent mechanical properties (high hardness and high wear resistance), better acid corrosion resistance and better antibacterial properties.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:R783.1
【參考文獻】
相關(guān)期刊論文 前6條
1 肖東琴;王東微;任俊臣;段可;姚寧;魯雄;鄭曉彤;翁杰;;摻銅羥基磷灰石微球的制備及表征[J];無機材料學(xué)報;2014年07期
2 趙欣;王德平;邱雯青;葉松;;摻鍶量對羥基磷灰石形貌及其熒光特性的影響[J];無機材料學(xué)報;2013年01期
3 崔福齋;郭牧遙;;生物陶瓷材料的應(yīng)用及其發(fā)展前景[J];藥物分析雜志;2010年07期
4 李星逸;王海波;孫青竹;劉國權(quán);孟祥才;;羥基磷灰石復(fù)合生物材料的研究進展[J];佳木斯大學(xué)學(xué)報(自然科學(xué)版);2006年01期
5 鄭靖,石心余,周仲榮;人牙釉質(zhì)在人工唾液潤滑下與不同偶件對摩時的摩擦學(xué)性能研究[J];摩擦學(xué)學(xué)報;2004年02期
6 張新平,于思榮,夏連杰,何鎮(zhèn)明;鈦及鈦合金在牙科領(lǐng)域中的研究現(xiàn)狀[J];稀有金屬材料與工程;2002年04期
,本文編號:1888083
本文鏈接:http://sikaile.net/yixuelunwen/swyx/1888083.html
最近更新
教材專著