口罩日常消毒后还能否有效阻隔病毒?让扫描电镜告诉你答案
p style=" text-align: center text-indent: 0em " img style=" max-width: 100% max-height: 100% width: 500px height: 240px " src=" https://img1.17img.cn/17img/images/202002/uepic/c1abc6ac-a698-4a5f-a56d-00b3f459555d.jpg" title=" 1.jpg" alt=" 1.jpg" width=" 500" height=" 240" border=" 0" vspace=" 0" / /p section data-mid=" " style=" margin: 0px padding: 0px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important width: 677px display: flex justify-content: flex-start align-items: center flex-direction: column background-image: url(" background-repeat:=" " background-size:=" " section data-mpa-category=" 模板" data-mid=" " data-mpa-template=" t" style=" margin: 0px padding: 0px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important width: 677px display: flex justify-content: flex-start align-items: center flex-direction: column " section data-mid=" " style=" margin: 0px padding: 0px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important width: 677px display: flex align-items: center flex-direction: column justify-content: flex-end " section data-mid=" " style=" margin: 0px 0px -297.198px padding: 0px 35.875px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important width: 677px display: flex justify-content: flex-start align-items: center flex-direction: column z-index: 10 " section data-mid=" " style=" margin: 0px 0px 61.7292px padding: 0px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important width: 605.25px display: flex justify-content: flex-start align-items: flex-end " section data-mid=" " style=" margin: 0px padding: 0px max-width: 100% width: 33px height: 3px background-image: initial background-position: initial background-size: initial background-repeat: initial background-attachment: initial background-origin: initial background-clip: initial box-sizing: border-box !important overflow-wrap: break-word !important " br style=" margin: 0px padding: 0px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important " / /section /section section data-mid=" " style=" margin: 0px 0px 30.8646px padding: 0px max-width: 100% box-sizing: border-box !important word-wrap: break-word !important width: 605.25px display: flex justify-content: flex-start align-items: flex-end font-size: 18px font-weight: bold color: rgb(253, 253, 253) " p data-mid=" " style=" margin-top: 0px margin-bottom: 0px padding: 0px max-width: 100% clear: both min-height: 1em box-sizing: border-box !important overflow-wrap: break-word !important " br/ /p /section /section /section /section /section p style=" text-align: left text-indent: 2em " 新型冠状病毒疫情出现以来,大家的防疫意识普遍增强。尤其是口罩,成了出行防护的标配。看着与日俱增的新增病例,盘算着自己手中不多的口罩,面对着口罩购买的囧境,小编也不禁一声叹息。很多读者都在问:经过日常消毒的口罩,还能重复使用吗?小编这就带你一起寻找答案! /p p style=" text-align: center text-indent: 0em " strong span style=" text-indent: 2em background-color: rgb(0, 176, 240) color: rgb(255, 255, 255) " 口罩是如何阻隔病毒的? /span /strong br/ /p p style=" text-align: center" img style=" max-width: 100% max-height: 100% width: 600px height: 436px " src=" https://img1.17img.cn/17img/images/202002/uepic/69c7e2c5-99d2-4e48-a9a8-522ee0971b58.jpg" title=" 2.jpg" alt=" 2.jpg" width=" 600" height=" 436" border=" 0" vspace=" 0" / /p p style=" text-indent: 2em " span style=" text-indent: 2em " 不 /span span style=" text-indent: 2em " 管是普通医用口罩、医用外科口罩还是医用防护口罩,之所以能够有效的阻隔病毒,关键在于口罩中的一种关键材料: strong 熔喷无纺布 /strong 。 /span /p p style=" text-indent: 2em " strong & nbsp 熔喷无纺布 /strong 是一种超细纤维无纺布,纤维细度为0.5~1.0um,这种纤维材料带有持久的静电,可依靠静电效应捕集微细尘埃,具有高过滤效率和低过滤阻力的优点,不仅对0.005~1mm的固体尘粒有很好的过滤效果,还对大气中的气溶胶、细菌、香烟烟雾、各种花粉等均有很好的阻截效果。 /p p style=" text-indent: 0em text-align: center " span style=" color: rgb(0, 112, 192) font-size: 18px " strong span style=" color: rgb(0, 112, 192) text-align: center text-indent: 0em " Question /span /strong /span /p p style=" text-indent: 2em " 那么问题来了:日常的家庭消毒方法,如酒精浸泡和沸水高温消毒法,会对熔喷无纺布的纤维结构造成破坏或使其溶解吗?小编依次进行了实验,并通过 strong KYKY场发射枪扫描电镜 /strong 对结果进行了观测,我们一起来看看吧! /p p style=" text-indent: 0em text-align: center " span style=" background-color: rgb(0, 176, 240) color: rgb(255, 255, 255) " strong 科学实验 /strong /span /p p style=" text-align: center" img style=" max-width: 100% max-height: 100% width: 450px height: 337px " src=" https://img1.17img.cn/17img/images/202002/uepic/fd8cdcbb-3179-45ce-8fa9-e8e65301bd70.jpg" title=" 3.jpg" alt=" 3.jpg" width=" 450" height=" 337" border=" 0" vspace=" 0" / /p p style=" text-indent: 2em " span style=" text-indent: 2em " 我们选用了N95医用防护口罩(左一)、普通医用口罩(左二)和3M颗粒物防护口罩(右一)作为本次实验样品。从过滤效果看:N95医用防护口罩>3M颗粒物防护口罩>普通医用口罩。 /span br/ /p p style=" text-indent: 2em " 对照组:使用KYKY场发射枪扫描电镜观测三种口罩的熔喷无纺布过滤层,样品未经过任何处理。 /p p style=" text-align: center" img style=" max-width:100% max-height:100% " src=" https://img1.17img.cn/17img/images/202002/uepic/8dfbfada-7e99-4779-8301-ee803d0d5453.jpg" title=" 4.jpg" alt=" 4.jpg" / /p p style=" text-align: center" img style=" max-width:100% max-height:100% " src=" https://img1.17img.cn/17img/images/202002/uepic/0541288f-30fa-40da-bd98-2648384b5f22.jpg" title=" 5.jpg" alt=" 5.jpg" / /p p style=" text-align: center" img style=" max-width:100% max-height:100% " src=" https://img1.17img.cn/17img/images/202002/uepic/7087cb91-3c11-470c-a014-cc62f2cbea59.jpg" title=" 6.jpg" alt=" 6.jpg" / /p p style=" text-align: center text-indent: 0em " span style=" color: rgb(0, 176, 240) " 组图1:放大倍数为200倍时,对照组的过滤层纤维结构图 /span br/ /p p style=" text-indent: 2em " 实验组1:对三种口罩进行酒精浸泡一小时,晾干后取出过滤层,使用KYKY场发射枪扫描电镜进行观测; /p p style=" text-indent: 2em " 实验组2:对三种口罩进行沸水煮10分钟,晾干后取出过滤层,使用KYKY场发射枪扫描电镜进行观测。 /p p style=" text-indent: 2em " 观测结果对比图如下。 /p p style=" text-indent: 2em " strong N95医用防护口罩: /strong /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/1d7aeed2-419e-4f30-b75c-3d9e258d39fa.jpg" title=" 7.jpg" / /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/56f2bb04-1ed6-4753-9804-6f1c28b214ea.jpg" title=" 8.jpg" / /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/5263f4d6-7b17-45cc-b5c1-4b6f7828a05d.jpg" title=" 9.jpg" / /p p style=" text-indent: 0em text-align: center " span style=" text-indent: 2em color: rgb(0, 176, 240) " 组图2:实验组N95医用口罩的过滤层纤维结构图 /span br/ /p p style=" text-indent: 2em " strong 普通医用口罩: /strong /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/aa97cd05-2680-4299-a466-11aa40f48a06.jpg" title=" 10.jpg" / /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/383a0962-f8af-43c2-99a1-c1b07b9852cd.jpg" title=" 11.jpg" / /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/681dd669-e81e-4aae-a2f5-d1bae7024d75.jpg" title=" 12.jpg" / /p p style=" text-align: center text-indent: 0em " span style=" text-indent: 2em color: rgb(0, 176, 240) " 组图3:实验组普通医用口罩的过滤层纤维结构图 /span br/ /p p style=" text-indent: 2em " strong 3M颗粒物防护口罩: /strong /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/7de1741d-d139-464b-8089-868d78392e37.jpg" title=" 13.jpg" / /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/7e6567a1-8383-4c33-b2b4-d5bb8bb516e1.jpg" title=" 14.jpg" / /p p style=" text-align: center" img style=" " src=" https://img1.17img.cn/17img/images/202002/uepic/bc0db44d-d516-4722-ac4d-5e05ea116a43.jpg" title=" 15.jpg" / /p p style=" text-indent: 0em text-align: center " span style=" text-indent: 2em color: rgb(0, 176, 240) " 组图4:实验组3M颗粒物防护口罩的过滤层纤维结构图 /span /p p style=" text-align: center text-indent: 0em " strong span style=" text-indent: 2em background-color: rgb(0, 176, 240) color: rgb(255, 255, 255) " 实验结论 /span /strong /p p style=" text-indent: 2em " 通过以上的电镜图片我们可以看到,熔喷无纺布的纤维虽然非常细,但并不是那么脆弱,即使用酒精浸泡1小时,或是用沸水煮10分钟,仍然能保持原有结构,纤维也没有出现断裂、变形或被腐蚀的现象。 /p p style=" text-indent: 2em " 那么有读者肯定会问:口罩过滤不是靠静电吸附吗?喷洒酒精使静电中和,口罩不就失效了吗?科普时间到:首先,静电中和并不代表口罩失效,因为口罩的过滤原理是靠 strong span style=" text-indent: 2em " 静电吸附、重力沉积、惯性沉积、扩散沉积效应 /span /strong span style=" text-indent: 2em " 和 strong 直接捕获 /strong 这五种方式共同作用来实现的。静电吸附对1um以内的颗粒或气溶胶有很好的过滤效果,而1um以上的过滤主要靠其他机理。所以,即使静电被中和了,你的口罩也不会完全失效! /span /p p style=" text-indent: 2em " 在这里小编要给大家 strong 划重点 /strong 了!虽然日常消毒方法不会破坏口罩过滤层的纤维结构,但并不能证明口罩的病毒过滤能力没有下降。在口罩数量不足的情况下,可以适当消毒,少次数的重复利用。 strong 但如果你身处疫区,或是周围人群已经明确存在感染者,那么一定不要吝惜口罩! /strong br/ /p p style=" text-indent: 0em text-align: center " strong span style=" background-color: rgb(0, 176, 240) color: rgb(255, 255, 255) " 口罩小贴士 /span /strong /p p style=" text-indent: 2em " 最后给大家分享一个鉴别普通医用一次性口罩真伪的小tips:大家如果对买到的医用一次性口罩真伪有疑虑,可以将中间的过滤层撕下来,用打火机点火测试。如果过滤层不易点着,恭喜你口罩是真的;如果过滤层很容易就点着了,那你买到的就是用普通纸材料替代熔喷无纺布的假口罩。 /p p style=" text-indent: 2em " 希望这篇文章可以帮到各位读者朋友们。大家一定要注意防护,做好隔离。等到春暖花开时,大家再相见! /p p style=" text-align: right text-indent: 2em " 【 a id=" js_name" style=" font-family: -apple-system-font, BlinkMacSystemFont, " helvetica=" " pingfang=" " hiragino=" " sans=" " microsoft=" " yahei=" " font-size:=" " letter-spacing:=" " white-space:=" " background-color:=" " margin:=" " padding:=" " color:=" " -webkit-tap-highlight-color:=" " cursor:=" " 中科科仪供稿 /a 】 /p